directive.cpp

// ============================================================================
//  Directive  (Open Directive / Directive Script)
//  A small, dynamically-typed scripting language, in one C++17 file.
//
//  - Lexer + recursive-descent parser + tree-walking evaluator
//  - Variant-style dynamic value type (Empty/Null/Bool/Int/Double/String/
//    Object/Array) with dynamic coercion rules
//  - 100+ built-in functions, classes, error handling (On Error / Err),
//    Sub/Function with ByRef/ByVal, Select Case, Do/For/While, With, etc.
//  - Native objects created with New:  Dictionary, List, RegExp, FileSystem
//    (+ File/Folder/TextStream), Sound, Shell, Mouse, Screen, Keyboard,
//    Clipboard.  They work on every platform (Windows-only ones raise otherwise).
//  - CreateObject("...") is reserved for REAL ActiveX/COM automation via
//    IDispatch on Windows (see #ifdef _WIN32 section): CreateObject("Excel.Application").
//  - The host object is "Directive": Directive.Echo, Directive.StdOut.Write,
//    Directive.StdIn.ReadLine, Directive.Quit, ...
//
//  Build (console, console-style stdio):
//    Linux/macOS : g++ -std=c++17 -O2 directive.cpp -o directive
//    Windows MSVC: cl /std:c++17 /EHsc directive.cpp
//    Windows MinGW: g++ -std=c++17 directive.cpp -o directive.exe -lole32 -loleaut32 -luuid -lwinmm -lgdi32 -luser32 -ladvapi32 -lshell32
//  Build (GUI, GUI-style dialogs) - add -DDIRECTIVE_GUI and a windowed subsystem:
//    Windows MSVC : cl /std:c++17 /EHsc /DDIRECTIVE_GUI directive.cpp /Fe:directivew.exe /link /SUBSYSTEM:WINDOWS
//    Windows MinGW: g++ -std=c++17 -DDIRECTIVE_GUI directive.cpp -o directivew.exe -mwindows -lole32 -loleaut32 -luuid -lwinmm -lgdi32 -luser32 -ladvapi32 -lshell32
//  (advapi32 = registry for Shell.Reg*, shell32 = Shell.SpecialFolders; MSVC links these via #pragma below.)
//
//  Run:  ./directive script.ds      (or:  ./directive -e "Directive.Echo 1+2")
//
//  License: MIT.

// ============================================================================
#include <string>
#include <vector>
#include <memory>
#include <unordered_map>
#include <map>
#include <chrono>
#include <list>
#include <iterator>
#include <functional>
#include <variant>
#include <cstdint>
#include <cmath>
#include <cctype>
#include <sstream>
#include <iostream>
#include <fstream>
#include <algorithm>
#include <stdexcept>
#include <ctime>
#include <regex>
#include <set>
#include <filesystem>
namespace fs = std::filesystem;
#include <cerrno>
#include <iomanip>
#include <cstdio>            // popen/_popen for Shell.Exec
#include <cstdlib>          // getenv/putenv, system
#ifndef _WIN32
  #include <sys/wait.h>     // WIFEXITED/WEXITSTATUS for Shell.Run/Exec exit codes
  #include <unistd.h>
  #include <termios.h>      // raw-mode key input for Console.ReadKey/Pause
  #include <sys/ioctl.h>    // TIOCGWINSZ for Console.Width/Height
  #include <fcntl.h>        // open("/dev/tty") when stdin is redirected
  extern char** environ;    // process environment (Shell.Environment enumeration)
#endif

// ------------------------------------------------------------------ platform libs
#if defined(_WIN32) && defined(_MSC_VER)
  #pragma comment(lib, "ole32.lib")
  #pragma comment(lib, "oleaut32.lib")
  #pragma comment(lib, "user32.lib")
  #pragma comment(lib, "gdi32.lib")
  #pragma comment(lib, "winmm.lib")
  #pragma comment(lib, "advapi32.lib")   // registry (Shell.RegRead/RegWrite/RegDelete)
  #pragma comment(lib, "shell32.lib")    // SHGetFolderPath (Shell.SpecialFolders)
  #ifdef DIRECTIVE_GUI
    #pragma comment(lib, "shell32.lib")
  #endif
#endif

// ------------------------------------------------------------------ ui layer
// Console builds route MsgBox/InputBox/Echo through stdio.
// GUI builds (compiled with -DDIRECTIVE_GUI on Windows) show real dialogs.
// Definitions live at the bottom of the file, next to the Win32 code.
namespace ui {
    void echo(const std::string& text);                                  // console echo
    long msgBox(const std::string& prompt, long flags, const std::string& title);   // returns button code
    bool inputBox(const std::string& prompt, const std::string& title,
                  const std::string& def, std::string& out);             // false == cancelled
    void error(const std::string& text);                                 // fatal error surface
}


// ------------------------------------------------------------------ utilities
static std::string toLower(const std::string& s) {
    std::string r = s;
    std::transform(r.begin(), r.end(), r.begin(),
                   [](unsigned char c){ return (char)std::tolower(c); });
    return r;
}

// ------------------------------------------------------------------ forwards
class Interpreter;
struct IObject;
using ObjectPtr = std::shared_ptr<IObject>;

struct ArrayData;
using ArrayPtr = std::shared_ptr<ArrayData>;

// -------------------------------------------------------------- error / signal
// A Directive runtime error. Number/description map onto the Err object.
struct DirectiveError {
    long number;
    std::string source;
    std::string description;
    long line = 0;             // source line where the error occurred (0 = unknown)
    long col  = 0;             // source column (0 = unknown)
    DirectiveError(long n, std::string d, std::string src = "Directive runtime error")
        : number(n), source(std::move(src)), description(std::move(d)) {}
};
[[noreturn]] static void raiseErr(long n, const std::string& d) { throw DirectiveError(n, d); }

// Non-local control flow used to implement Exit Sub/Function/For/Do/Property.
struct ExitSignal { enum K { Sub, Function, For, Do, Property, DoAll } kind; };

// ---------------------------------------------------------------- Value type
// The dynamic "Variant". Kept as plain members (not std::variant) so the rest
// of the code reads clearly. Object==null pointer with type Object encodes the
// Directive value "Nothing".
class Value {
public:
    enum class Type { Empty, Null, Bool, Int, Int64, Date, Double, String, Object, Array };
    Type type = Type::Empty;

    // VBScript distinguishes a 16-bit Integer from a 32-bit Long from a Byte.
    // All three live in Type::Int; this says which one, and it is observable
    // through TypeName, VarType, Hex and Oct.
    enum class ISub : unsigned char { Long, Integer, Byte };
    ISub isub = ISub::Long;
    bool single = false;          // a Type::Double holding a Single (VarType 4)

    bool        b = false;
    int32_t     i = 0;
    long long   i64 = 0;      // Type::Int64 (a Directive extension, VarType 20)
    double      d = 0.0;
    std::string s;
    ObjectPtr   obj;   // Object; nullptr => Nothing
    ArrayPtr    arr;

    Value() = default;

    static Value empty()            { return Value(); }
    static Value null()             { Value v; v.type = Type::Null; return v; }
    static Value nothing()          { Value v; v.type = Type::Object; v.obj = nullptr; return v; }
    static Value boolean(bool x)    { Value v; v.type = Type::Bool; v.b = x; return v; }
    static Value integer(int32_t x) { Value v; v.type = Type::Int; v.i = x; return v; }
    static Value int16(int16_t x)   { Value v; v.type = Type::Int; v.i = x; v.isub = ISub::Integer; return v; }
    static Value big(long long x)   { Value v; v.type = Type::Int64; v.i64 = x; return v; }
    static Value date(double x)     { Value v; v.type = Type::Date;  v.d = x; return v; }   // OLE serial
    bool isDate() const { return type == Type::Date; }
    static Value byteVal(unsigned char x) { Value v; v.type = Type::Int; v.i = x; v.isub = ISub::Byte; return v; }
    // True for the subtypes VBScript promotes as 16-bit in arithmetic.
    bool isNarrowInt() const { return (type == Type::Int && isub != ISub::Long) || type == Type::Bool || type == Type::Empty; }
    bool isIntish()    const { return type == Type::Int || type == Type::Int64 || type == Type::Bool || type == Type::Empty; }
    static Value number(double x)   { Value v; v.type = Type::Double; v.d = x; return v; }
    static Value sng(double x)      { Value v; v.type = Type::Double; v.d = (double)(float)x; v.single = true; return v; }
    static Value str(std::string x) { Value v; v.type = Type::String; v.s = std::move(x); return v; }
    static Value object(ObjectPtr o){ Value v; v.type = Type::Object; v.obj = std::move(o); return v; }
    static Value array(ArrayPtr a)  { Value v; v.type = Type::Array; v.arr = std::move(a); return v; }

    bool isEmpty()  const { return type == Type::Empty; }
    bool isNull()   const { return type == Type::Null; }
    bool isObject() const { return type == Type::Object; }
    bool isArray()  const { return type == Type::Array; }
    bool isNothing()const { return type == Type::Object && !obj; }

    // ---- coercions (Directive semantics) ----
    bool toBool() const;
    double toDouble() const;
    int32_t toInt() const;            // round-half-to-even, then int32
    long long toI64() const;
    std::string toStr() const;        // used by CStr / display
    std::string toConcatStr() const;  // used by & (Null -> "")
    bool looksNumeric() const;        // for IsNumeric
    std::string typeNameStr() const;   // for TypeName()
    int varType() const;              // for VarType()
};

// -------------------------------------------------------------- ArrayData
// N-dimensional array with 0-based lower bounds (Directive arrays are 0-based).
// `uppers[k]` is the inclusive upper bound of dimension k.
struct ArrayData {
    std::vector<int> uppers;
    std::vector<Value> data;

    size_t total() const {
        size_t n = 1;
        for (int u : uppers) n *= (size_t)(u + 1);
        return n;
    }
    size_t flatIndex(const std::vector<int>& idx) const {
        if (idx.size() != uppers.size())
            raiseErr(9, "Subscript out of range (wrong number of dimensions)");
        size_t flat = 0;
        for (size_t k = 0; k < uppers.size(); ++k) {
            if (idx[k] < 0 || idx[k] > uppers[k])
                raiseErr(9, "Subscript out of range");
            flat = flat * (size_t)(uppers[k] + 1) + (size_t)idx[k];
        }
        return flat;
    }
    void redim(const std::vector<int>& newUppers, bool preserve) {
        if (!preserve) {
            uppers = newUppers;
            data.assign(total(), Value::empty());
            return;
        }
        // Preserve: Directive only allows resizing the last dimension. We copy
        // element-by-element for the overlapping region (works for 1-D, which
        // is the overwhelmingly common case).
        ArrayData old = *this;
        uppers = newUppers;
        std::vector<Value> nd(total(), Value::empty());
        if (uppers.size() == old.uppers.size()) {
            std::vector<int> idx(uppers.size(), 0);
            std::function<void(size_t)> rec = [&](size_t dim) {
                if (dim == uppers.size()) {
                    bool inOld = true;
                    for (size_t k = 0; k < idx.size(); ++k)
                        if (idx[k] > old.uppers[k]) { inOld = false; break; }
                    if (inOld) nd[flatIndex(idx)] = old.data[old.flatIndex(idx)];
                    return;
                }
                for (int v = 0; v <= uppers[dim]; ++v) { idx[dim] = v; rec(dim + 1); }
            };
            if (total() > 0) rec(0);
        }
        data.swap(nd);
    }
};

// -------------------------------------------------------------- IObject
// Everything you can put a "." after implements this. Both script-defined
// classes and COM/native objects use it, so member access is uniform.
struct IObject : std::enable_shared_from_this<IObject> {
    virtual ~IObject() = default;
    virtual std::string typeName() const { return "Object"; }

    // Property-get OR method-call-returning-value (COM merges these; we do too).
    virtual Value get(Interpreter& in, const std::string& name, std::vector<Value>& args) = 0;

    // Property assignment: `obj.Name = v` (isSet=false, "Let") or
    // `Set obj.Name = v` (isSet=true).
    virtual void set(Interpreter& in, const std::string& name,
                     std::vector<Value>& args, const Value& val, bool isSet) {
        (void)in;(void)args;(void)val;(void)isSet;
        raiseErr(438, "Object doesn't support this property or method: " + name);
    }

    // Default property/value, for `x = obj` or coercions. Return false if none.
    virtual bool tryDefault(Interpreter& in, Value& out) { (void)in;(void)out; return false; }

    // For..Each enumeration. Fill `out` with the elements. Return false if the
    // object is not enumerable.
    virtual bool enumerate(Interpreter& in, std::vector<Value>& out) {
        (void)in;(void)out; return false;
    }

    // True only for COM/ActiveX wrappers. Such objects can be thin accessors whose
    // validity depends on their parent staying alive (Illustrator etc.), so the
    // evaluator keeps them anchored for the duration of a statement.
    virtual bool isComRef() const { return false; }
};

// -------------------------------------------------- number formatting helpers
// ------------------------------------------------------------------- LOCALE
// VBScript formats and parses numbers and dates through the Windows locale, so
// on a Belgian machine CStr(2.5) is "2,5" and CDbl("1.5") is 15 (the dot being a
// thousands separator). Directive mirrors that: on Windows the OS is asked, on
// POSIX a small table is used so behaviour stays deterministic and testable.
struct LocaleInfo {
    int         lcid          = 1033;
    std::string decimalSep    = ".";
    std::string thousandsSep  = ",";
    std::string currencySym   = "$";
    int         currencyPos   = 0;   // LOCALE_ICURRENCY: 0 pre, 1 post, 2 pre+space, 3 post+space
    bool        fromOS        = true; // adopted from the machine rather than SetLocale
    bool        dayFirst      = false;    // d/m/y rather than m/d/y
};
static LocaleInfo g_loc;
static std::string dateToDisplayString(double serial);
static void localeApply(int lcid);        // 0 = the OS user default
static std::string osFormatDate(int y, int mo, int d);
static std::string osFormatTime(int h, int mi, int se);
static std::string osFormatDateLong(int y, int mo, int d);
static std::string osFormatTimeShort(int h, int mi);
static std::string osMonthName(int mo, bool abbrev);      // mo 1-12
static std::string osDayName(int idx, bool abbrev);       // idx 0 = Sunday

static std::string numToStrPrec(double v, int prec) {
    if (std::isnan(v)) return "NaN";
    if (std::isinf(v)) return v < 0 ? "-1.#INF" : "1.#INF";
    if (std::floor(v) == v && std::fabs(v) < ((prec >= 15) ? 1e15 : 1e7))
        return std::to_string((long long)v);
    std::ostringstream os;
    os << std::uppercase << std::setprecision(prec) << v;   // VBScript prints 1E+18, not 1e+18
    std::string out = os.str();
    if (g_loc.decimalSep != ".") {
        size_t dot = out.find('.');
        if (dot != std::string::npos) out.replace(dot, 1, g_loc.decimalSep);
    }
    return out;
}
static std::string numToStr(double v) { return numToStrPrec(v, 15); }
// VBScript's default date-to-string: date only when there is no time part, time
// only when there is no date part, otherwise both -- all in the locale's format.
static void ymdhmsFromSerial(double s, int& y, int& mo, int& d, int& h, int& mi, int& se);
static std::string dateToDisplayString(double serial) {
    int y, mo, d, h, mi, se;
    ymdhmsFromSerial(serial, y, mo, d, h, mi, se);
    bool hasDate = std::floor(serial) != 0.0;
    bool hasTime = (serial - std::floor(serial)) != 0.0;
    if (hasDate && !hasTime) return osFormatDate(y, mo, d);
    if (!hasDate)            return osFormatTime(h, mi, se);
    return osFormatDate(y, mo, d) + " " + osFormatTime(h, mi, se);
}
static double roundHalfEven(double v) {
    double fl = std::floor(v);
    double diff = v - fl;
    if (diff < 0.5) return fl;
    if (diff > 0.5) return fl + 1.0;
    return (std::fmod(fl, 2.0) == 0.0) ? fl : fl + 1.0;   // .5 -> nearest even
}
// Parse a numeric prefix the way Directive coercion does; strict=true requires
// the WHOLE string to be numeric (used by IsNumeric).
static bool parseNumber(const std::string& in, double& out, bool strict) {
    std::string s = in;
    size_t a = s.find_first_not_of(" \t");
    if (a == std::string::npos) { if (strict) return false; out = 0; return true; }
    size_t z = s.find_last_not_of(" \t");
    s = s.substr(a, z - a + 1);
    if (s.empty()) { if (strict) return false; out = 0; return true; }
    // hex / octal literals
    if (s.size() > 2 && (s[0] == '&')) {
        char t = (char)std::tolower(s[1]);
        try {
            if (t == 'h') { out = (double)std::stoll(s.substr(2), nullptr, 16); return true; }
            if (t == 'o') { out = (double)std::stoll(s.substr(2), nullptr, 8);  return true; }
        } catch (...) { return false; }
    }
    // Locale-aware, matching VBScript exactly: the thousands separator is simply
    // removed, then the decimal separator becomes a point. On a comma-decimal
    // locale that makes "1.5" fifteen and "1.000,5" one thousand and a half.
    if (g_loc.decimalSep != "." || g_loc.thousandsSep != ",") {
        if (!g_loc.thousandsSep.empty()) {
            size_t f;
            while ((f = s.find(g_loc.thousandsSep)) != std::string::npos)
                s.erase(f, g_loc.thousandsSep.size());
        }
        if (g_loc.decimalSep != ".") {
            size_t f = s.find(g_loc.decimalSep);
            if (f != std::string::npos) s.replace(f, g_loc.decimalSep.size(), ".");
        }
    }
    const char* p = s.c_str();
    char* end = nullptr;
    errno = 0;
    double val = std::strtod(p, &end);
    if (end == p) return false;
    if (strict) { while (*end == ' ' || *end == '\t') ++end; if (*end != '\0') return false; }
    out = val;
    return true;
}

// ----------------------------------------------------------- Value coercions
double Value::toDouble() const {
    switch (type) {
        case Type::Empty:  return 0.0;
        case Type::Null:   raiseErr(94, "Invalid use of Null");
        case Type::Bool:   return b ? -1.0 : 0.0;   // True == -1 in Directive
        case Type::Int:    return (double)i;
        case Type::Int64:  return (double)i64;
        case Type::Date:   return d;
        case Type::Double: return d;
        case Type::String: { double v; if (!parseNumber(s, v, true)) raiseErr(13, "Type mismatch"); return v; }
        case Type::Object: { /* default property */ return 0.0; }
        case Type::Array:  raiseErr(13, "Type mismatch");
    }
    return 0.0;
}
long long Value::toI64() const {
    if (type == Type::Int64) return i64;          // exact, no double round-trip
    if (type == Type::Int)   return i;
    return (long long)roundHalfEven(toDouble());
}
int32_t Value::toInt() const {
    long long v = toI64();
    return (int32_t)v;
}
bool Value::toBool() const {
    switch (type) {
        case Type::Empty:  return false;
        case Type::Null:   raiseErr(94, "Invalid use of Null");
        case Type::Bool:   return b;
        case Type::Int:    return i != 0;
        case Type::Int64:  return i64 != 0;
        case Type::Date:   return d != 0.0;
        case Type::Double: return d != 0.0;
        case Type::String: {
            std::string t = toLower(s);
            if (t == "true")  return true;
            if (t == "false") return false;
            double v; if (!parseNumber(s, v, true)) raiseErr(13, "Type mismatch");
            return v != 0.0;
        }
        case Type::Object: if (!obj) return false; return true;
        case Type::Array:  raiseErr(13, "Type mismatch");
    }
    return false;
}
std::string Value::toStr() const {
    switch (type) {
        case Type::Empty:  return "";
        case Type::Null:   raiseErr(94, "Invalid use of Null");
        case Type::Bool:   return b ? "True" : "False";
        case Type::Int:    return std::to_string(i);
        case Type::Int64:  return std::to_string(i64);
        case Type::Date:   return dateToDisplayString(d);
        case Type::Double: return single ? numToStrPrec(d, 7) : numToStr(d);   // a Single shows 7 digits
        case Type::String: return s;
        case Type::Object: if (!obj) raiseErr(13, "Type mismatch"); return "[object]";
        case Type::Array:  raiseErr(13, "Type mismatch");
    }
    return "";
}
std::string Value::toConcatStr() const {   // & operator: Null becomes ""
    if (type == Type::Null || type == Type::Empty) return "";
    return toStr();
}
bool Value::looksNumeric() const {
    if (type == Type::Int || type == Type::Int64 || type == Type::Double || type == Type::Bool) return true;
    if (type == Type::String) { double v; return parseNumber(s, v, true); }
    return false;
}
std::string Value::typeNameStr() const {
    switch (type) {
        case Type::Empty:  return "Empty";
        case Type::Null:   return "Null";
        case Type::Bool:   return "Boolean";
        case Type::Int:    return isub == ISub::Integer ? "Integer" : (isub == ISub::Byte ? "Byte" : "Long");
        case Type::Int64:  return "LongLong";
        case Type::Date:   return "Date";
        case Type::Double: return single ? "Single" : "Double";
        case Type::String: return "String";
        case Type::Array:  return "Variant()";
        case Type::Object: return obj ? obj->typeName() : "Nothing";
    }
    return "Empty";
}
int Value::varType() const {  // subset of VarType constants
    switch (type) {
        case Type::Empty:  return 0;    // Empty
        case Type::Null:   return 1;    // Null
        case Type::Int:    return isub == ISub::Integer ? 2 : (isub == ISub::Byte ? 17 : 3);
        case Type::Int64:  return 20;   // VT_I8, as VBA reports for LongLong
        case Type::Date:   return 7;
        case Type::Double: return single ? 4 : 5;
        case Type::String: return 8;    // String
        case Type::Bool:   return 11;   // Boolean
        case Type::Object: return 9;  // VarType is 9 for an object even when it is Nothing
        case Type::Array:  return 8192 + 12;   // Array + Variant
    }
    return 0;
}

// ================================================================== LEXER
enum class Tok {
    End, Eol, Colon, Ident, Number, String, DateLit,
    Plus, Minus, Star, Slash, Backslash, Caret, Amp,
    Eq, Ne, Lt, Gt, Le, Ge,
    LParen, RParen, Comma, Dot
};
struct Token {
    Tok kind;
    std::string text;   // identifiers keep original case; lower is precomputed
    std::string lower;
    Value num;          // for Number
    std::string str;    // for String
    int line;
    int col = 1;        // 1-based column where the token starts
    bool bracketed = false;   // [ident]: a literal identifier, never a keyword (Directive / COM interop)
};

class Lexer {
    const std::string& src;
    size_t pos = 0;
    int line = 1;
    size_t lineStart = 0;   // byte offset of the current line's first char
    int tokCol = 1;         // column of the token currently being read
public:
    explicit Lexer(const std::string& s) : src(s) {}

    std::vector<Token> tokenize() {
        std::vector<Token> out;
        while (true) {
            skipInline();
            if (pos >= src.size()) { push(out, Tok::End); break; }
            char c = src[pos];
            tokCol = (int)(pos - lineStart) + 1;   // column where this token begins

            // comments: ' ... to EOL
            if (c == '\'') { while (pos < src.size() && src[pos] != '\n') pos++; continue; }

            // end of statement
            if (c == '\n') { pos++; lineStart = pos; push(out, Tok::Eol); line++; continue; }
            if (c == '\r') { pos++; continue; }
            if (c == ':')  { pos++; push(out, Tok::Colon); continue; }

            // identifiers / keywords / Rem-comments
            if (std::isalpha((unsigned char)c) || c == '_') {
                std::string id;
                while (pos < src.size() &&
                       (std::isalnum((unsigned char)src[pos]) || src[pos] == '_'))
                    id += src[pos++];
                std::string lo = toLower(id);
                if (lo == "rem") { while (pos < src.size() && src[pos] != '\n') pos++; continue; }
                Token t; t.kind = Tok::Ident; t.text = id; t.lower = lo; t.line = line; t.col = tokCol;
                out.push_back(t);
                continue;
            }

            // bracket identifiers: [any text] is a literal identifier, even when it
            // is a keyword, contains spaces, or starts with a digit. Mainly for COM
            // interop with members whose names collide with keywords.
            if (c == '[') {
                pos++;   // consume '['
                std::string id;
                while (pos < src.size() && src[pos] != ']' && src[pos] != '\n') id += src[pos++];
                if (pos >= src.size() || src[pos] != ']') raiseErr(1057, "Unterminated '[' identifier");
                pos++;   // consume ']'
                if (id.empty()) raiseErr(1057, "Empty '[]' identifier");
                Token t; t.kind = Tok::Ident; t.text = id; t.lower = toLower(id);
                t.bracketed = true; t.line = line; t.col = tokCol;
                out.push_back(t);
                continue;
            }

            // numbers (decimal + &H hex + &O octal)
            if (std::isdigit((unsigned char)c) || (c == '.' && pos + 1 < src.size() &&
                                                   std::isdigit((unsigned char)src[pos + 1]))) {
                out.push_back(readNumber());
                continue;
            }
            if (c == '&' && pos + 1 < src.size() &&
                (std::tolower(src[pos + 1]) == 'h' || std::tolower(src[pos + 1]) == 'o')) {
                out.push_back(readNumber());
                continue;
            }

            // strings
            if (c == '"') { out.push_back(readString()); continue; }

            // date literals: #2020-03-15#, #1/15/2020 3:45:00 PM#, #13:45:00#
            if (c == '#') { out.push_back(readDate()); continue; }

            // operators / punctuation
            switch (c) {
                case '+': pos++; push(out, Tok::Plus); break;
                case '-': pos++; push(out, Tok::Minus); break;
                case '*': pos++; push(out, Tok::Star); break;
                case '/': pos++; push(out, Tok::Slash); break;
                case '\\':pos++; push(out, Tok::Backslash); break;
                case '^': pos++; push(out, Tok::Caret); break;
                case '&': pos++; push(out, Tok::Amp); break;
                case '(': pos++; push(out, Tok::LParen); break;
                case ')': pos++; push(out, Tok::RParen); break;
                case ',': pos++; push(out, Tok::Comma); break;
                case '.': pos++; push(out, Tok::Dot); break;
                case '=': pos++; push(out, Tok::Eq); break;
                case '<':
                    pos++;
                    if (peek() == '>') { pos++; push(out, Tok::Ne); }
                    else if (peek() == '=') { pos++; push(out, Tok::Le); }
                    else push(out, Tok::Lt);
                    break;
                case '>':
                    pos++;
                    if (peek() == '=') { pos++; push(out, Tok::Ge); }
                    else push(out, Tok::Gt);
                    break;
                default:
                    raiseErr(1057, std::string("Unexpected character '") + c + "'");
            }
        }
        return out;
    }
private:
    char peek() const { return pos < src.size() ? src[pos] : '\0'; }
    void push(std::vector<Token>& out, Tok k) {
        Token t; t.kind = k; t.line = line; t.col = tokCol; out.push_back(t);
    }
    // Skip spaces/tabs; honor the "_" line-continuation (underscore then EOL).
    void skipInline() {
        while (pos < src.size()) {
            char c = src[pos];
            if (c == ' ' || c == '\t') { pos++; continue; }
            if (c == '_') {
                size_t q = pos + 1;
                while (q < src.size() && (src[q] == ' ' || src[q] == '\t' || src[q] == '\r')) q++;
                if (q < src.size() && src[q] == '\n') { pos = q + 1; lineStart = pos; line++; continue; }
                if (q >= src.size()) { pos = q; continue; }
            }
            break;
        }
    }
    Token readNumber() {
        Token t; t.kind = Tok::Number; t.line = line; t.col = tokCol;
        std::string n;
        if (src[pos] == '&') {
            n += src[pos++];              // &
            n += src[pos++];              // h / o
            while (pos < src.size() && std::isalnum((unsigned char)src[pos])) n += src[pos++];
            double v; parseNumber(n, v, false);
            t.num = Value::integer((int32_t)v);
            return t;
        }
        bool isFloat = false;
        while (pos < src.size()) {
            char c = src[pos];
            if (std::isdigit((unsigned char)c)) n += src[pos++];
            else if (c == '.') { isFloat = true; n += src[pos++]; }
            else if (c == 'e' || c == 'E') {
                isFloat = true; n += src[pos++];
                if (pos < src.size() && (src[pos] == '+' || src[pos] == '-')) n += src[pos++];
            } else break;
        }
        if (isFloat) t.num = Value::number(std::stod(n));
        else {
            try { long long v = std::stoll(n);
                  // VBScript types a literal as the smallest that fits.
                  if (v >= -32768 && v <= 32767)             t.num = Value::int16((int16_t)v);
                  else if (v >= INT32_MIN && v <= INT32_MAX) t.num = Value::integer((int32_t)v);
                  else t.num = Value::big(v); }   // LongLong rung: exact past 2^31
            catch (...) { t.num = Value::number(std::stod(n)); }
        }
        return t;
    }
    Token readString() {
        Token t; t.kind = Tok::String; t.line = line; t.col = tokCol;
        pos++; // opening quote
        std::string s;
        while (pos < src.size()) {
            char c = src[pos++];
            if (c == '"') {
                if (pos < src.size() && src[pos] == '"') { s += '"'; pos++; }  // "" -> "
                else break;
            } else s += c;
        }
        t.str = s;
        return t;
    }
    Token readDate() {
        Token t; t.kind = Tok::DateLit; t.line = line; t.col = tokCol;
        pos++; // opening #
        std::string s;
        while (pos < src.size() && src[pos] != '#' && src[pos] != '\n') s += src[pos++];
        if (pos < src.size() && src[pos] == '#') pos++;   // closing #
        t.str = s;   // raw contents; parser converts via parseDateToSerial
        return t;
    }
};

// =================================================================== AST
struct Expr;
struct Stmt;
using ExprP = std::shared_ptr<Expr>;
using StmtP = std::shared_ptr<Stmt>;

struct Expr {
    enum K { Lit, Var, Unary, Binary, Index, Member, New } k;
    Value lit;                 // Lit
    std::string name;          // Var name / Member name / New classname / operator
    std::string lname;         // precomputed lowercase of name (Var/Member/New) - avoids per-access toLower
    ExprP a, b;                // Unary:a  Binary:a,b  Index:a(target)  Member:a(target)
    std::vector<ExprP> args;   // Index args
    int line = 0;
};
static ExprP mkLit(Value v)                       { auto e=std::make_shared<Expr>(); e->k=Expr::Lit; e->lit=std::move(v); return e; }
static ExprP mkVar(std::string n)                 { auto e=std::make_shared<Expr>(); e->k=Expr::Var; e->lname=toLower(n); e->name=std::move(n); return e; }
static ExprP mkUnary(std::string op, ExprP a)     { auto e=std::make_shared<Expr>(); e->k=Expr::Unary; e->name=std::move(op); e->a=std::move(a); return e; }
static ExprP mkBinary(std::string op,ExprP a,ExprP b){ auto e=std::make_shared<Expr>(); e->k=Expr::Binary; e->name=std::move(op); e->a=std::move(a); e->b=std::move(b); return e; }
static ExprP mkMember(ExprP t, std::string n)     { auto e=std::make_shared<Expr>(); e->k=Expr::Member; e->a=std::move(t); e->lname=toLower(n); e->name=std::move(n); return e; }
static ExprP mkIndex(ExprP t, std::vector<ExprP> a){ auto e=std::make_shared<Expr>(); e->k=Expr::Index; e->a=std::move(t); e->args=std::move(a); return e; }
static ExprP mkNew(std::string cls)               { auto e=std::make_shared<Expr>(); e->k=Expr::New; e->lname=toLower(cls); e->name=std::move(cls); return e; }

struct Param { std::string name; std::string lname; bool byVal = false; };

// One "Case" label: a plain value, an "Is <op> value", or "lo To hi".
struct CaseTest {
    enum K { Val, Is, Range } k = Val;
    ExprP e1, e2;
    std::string op;   // for Is
};
struct CaseClause {
    std::vector<CaseTest> tests;   // empty => Case Else
    std::vector<StmtP> body;
};

struct Stmt {
    enum K {
        DimS, ReDimS, Assign, SetAssign, IfS, ForS, ForEachS, DoLoopS, WhileS,
        SelectS, SubDecl, FuncDecl, ClassDecl, CallS, ExitS, OnErrorS, ConstS,
        OptionS, PropDecl, WithS, EraseS, MidS
    } k;
    int line = 0;
    int col = 0;

    // Dim / Const
    std::vector<std::pair<std::string, std::vector<ExprP>>> decls; // name + optional dims
    std::vector<std::pair<std::string, ExprP>> consts;

    // ReDim
    bool preserve = false;
    std::string name;                 // ReDim target / For var / class or proc name / Exit-what
    std::string lname;                // precomputed lowercase of name (For/ForEach loop var)
    std::vector<ExprP> dims;

    // Assign / SetAssign
    ExprP target, value;

    // If
    ExprP cond;
    std::vector<StmtP> body;                                  // then / loop body / else-less
    std::vector<std::pair<ExprP, std::vector<StmtP>>> elifs;
    std::vector<StmtP> elseBody;

    // For
    ExprP fromE, toE, stepE;

    // ForEach / With / Select
    ExprP coll;   // For Each collection, With object, Select expr

    // DoLoop
    int testPos = 0;      // 0 none, 1 pre (Do While/Until), 2 post (Loop While/Until)
    bool isUntil = false;

    // Select
    std::vector<CaseClause> cases;

    // Sub/Function/Property
    std::vector<Param> params;
    bool isFunction = false;
    int propKind = 0;     // 0 Get, 1 Let, 2 Set
    bool isDefault = false;   // marked with the Default keyword (class default member)

    // Class
    std::vector<StmtP> members;

    // Call
    ExprP callee;
    std::vector<ExprP> callArgs;

    // OnError: 1 = Resume Next, 0 = Goto 0
    int errMode = 0;
    // Option Explicit
    bool optExplicit = false;
};

// ================================================================== PARSER
// parseDateToSerial is defined in the interpreter section; the parser needs it for #date# literals.
static bool parseDateToSerial(const std::string& in, double& out);

class Parser {
    std::vector<Token> t;
    size_t p = 0;
    bool inProc = false;    // currently inside a Sub/Function/Property body
    bool inClass = false;   // currently inside a Class body
    std::string baseDir_;                                  // directory of the file being parsed (for relative Include)
    std::shared_ptr<std::set<std::string>> included_;      // canonical paths already included (guard against dupes/cycles)
public:
    explicit Parser(std::vector<Token> toks, std::string baseDir = std::string(),
                    std::shared_ptr<std::set<std::string>> included = nullptr)
        : t(std::move(toks)), baseDir_(std::move(baseDir)),
          included_(included ? included : std::make_shared<std::set<std::string>>()) {}
    ExprP parseOneExpr() { return parseExpr(); }   // used by Eval()
    std::vector<StmtP> parseProgram() {
        auto prog = parseStatements({});
        if (cur().kind != Tok::End)
            err("Unexpected '" + cur().text + "'");
        return prog;
    }
private:
    // ---- token helpers ----
    const Token& cur() const { return t[p]; }
    const Token& peek(size_t n = 1) const { return t[std::min(p + n, t.size() - 1)]; }
    void adv() { if (p + 1 < t.size()) p++; }
    bool is(Tok k) const { return cur().kind == k; }
    // Is there whitespace between the previous token and this one? VBScript uses
    // exactly this to tell `Echo .Member` (a With-member ARGUMENT) apart from
    // `obj.Member` (member access) after a paren-less call target.
    bool gapBefore() const {
        if (p == 0 || p >= t.size()) return false;
        const Token& pv = t[p - 1];
        if (pv.line != t[p].line) return true;
        int len = pv.text.empty() ? 1 : (int)pv.text.size();
        if (pv.bracketed) len += 2;
        return t[p].col > pv.col + len;
    }
    bool isKw(const char* kw) const { return cur().kind == Tok::Ident && !cur().bracketed && cur().lower == kw; }
    bool peekKw(const char* kw) const { return peek().kind == Tok::Ident && !peek().bracketed && peek().lower == kw; }
    [[noreturn]] void err(const std::string& m) {
        DirectiveError e(1025, m, "Directive compilation error");
        e.line = cur().line;
        e.col  = cur().col;
        throw e;
    }
    void expect(Tok k, const char* what) { if (!is(k)) err(std::string("Expected ") + what); adv(); }
    void expectKw(const char* kw) { if (!isKw(kw)) err(std::string("Expected '") + kw + "'"); adv(); }
    void skipSeps() { while (is(Tok::Eol) || is(Tok::Colon)) adv(); }
    void skipEol()  { while (is(Tok::Eol)) adv(); }
    std::string ident(const char* what) {
        if (!is(Tok::Ident)) err(std::string("Expected ") + what);
        std::string s = cur().text; adv(); return s;
    }
    static bool canStartExpr(const Token& tk) {
        switch (tk.kind) {
            case Tok::Number: case Tok::String: case Tok::DateLit: case Tok::LParen:
            case Tok::Minus: case Tok::Plus: case Tok::Ident: case Tok::Dot:
                return true;
            default: return false;
        }
    }

    // ---- block of statements until a terminator keyword ----
    std::vector<StmtP> parseStatements(const std::set<std::string>& stop) {
        std::vector<StmtP> out;
        while (true) {
            skipSeps();
            if (is(Tok::End)) break;
            if (is(Tok::Ident) && !cur().bracketed && stop.count(cur().lower)) break;
            if (is(Tok::Ident) && !cur().bracketed && cur().lower == "include") { parseIncludeInto(out); continue; }
            out.push_back(parseStatement());
        }
        return out;
    }
    // Include "file" — parse the referenced file at parse time and splice its
    // top-level statements in here (so its Sub/Function/Class/Const hoist normally).
    void parseIncludeInto(std::vector<StmtP>& out) {
        if (inProc || inClass) err("Include is only allowed at the top level");
        adv();   // 'include'
        if (!is(Tok::String)) err("Include expects a quoted file path");
        std::string rel = cur().str; adv();

        fs::path pth(rel);
        std::error_code ec;
        if (pth.is_relative() && !baseDir_.empty()) pth = fs::path(baseDir_) / pth;
        fs::path canon = fs::weakly_canonical(pth, ec);
        if (ec || canon.empty()) canon = fs::absolute(pth, ec);
        std::string key = canon.string();

        if (included_->count(key)) return;         // include guard: skip already-included files
        included_->insert(key);

        std::ifstream f(canon, std::ios::binary);
        if (!f) err("Include: cannot open file '" + rel + "'");
        std::string src((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
        if (src.size() >= 3 && (unsigned char)src[0] == 0xEF &&
            (unsigned char)src[1] == 0xBB && (unsigned char)src[2] == 0xBF)
            src = src.substr(3);                   // strip UTF-8 BOM

        Lexer lx(src);
        Parser sub(lx.tokenize(), canon.parent_path().string(), included_);
        std::vector<StmtP> inc;
        try { inc = sub.parseProgram(); }
        catch (DirectiveError& e) { e.description = "in included file '" + rel + "': " + e.description; throw; }
        for (auto& s : inc) out.push_back(std::move(s));
    }
    // ---- statements separated by ':' on a single line (for one-line If) ----
    std::vector<StmtP> parseInlineStmts(const std::set<std::string>& stop) {
        std::vector<StmtP> out;
        while (true) {
            if (is(Tok::Eol) || is(Tok::End)) break;
            if (is(Tok::Ident) && !cur().bracketed && stop.count(cur().lower)) break;
            out.push_back(parseStatement());
            if (is(Tok::Colon)) { adv(); continue; }
            break;
        }
        return out;
    }

    // ---- dispatch a single statement ----
    StmtP parseStatement() {
        int ln = cur().line, col = cur().col;
        StmtP s = parseStatementInner();
        if (s) { if (!s->line) s->line = ln; if (!s->col) s->col = col; }
        return s;
    }
    StmtP parseStatementInner() {
        int ln = cur().line;
        if (is(Tok::Dot)) return parseAssignOrCall();   // .Member inside With
        if (is(Tok::Ident) && !cur().bracketed) {   // bracketed [ident] is never a keyword -> falls through to assign/call
            const std::string& kw = cur().lower;
            if (kw == "dim")      return parseDim(false);
            if (kw == "redim")    return parseReDim();
            if (kw == "set")      return parseSet();
            if (kw == "if")       return parseIf();
            if (kw == "for")      return parseFor();
            if (kw == "do")       return parseDo();
            if (kw == "while")    return parseWhile();
            if (kw == "select")   return parseSelect();
            if (kw == "sub")      { if (inProc) err("a Sub cannot be defined inside another procedure"); return parseProc(false); }
            if (kw == "function") { if (inProc) err("a Function cannot be defined inside another procedure"); return parseProc(true); }
            if (kw == "property") { if (inProc) err("a Property cannot be defined inside another procedure"); if (!inClass) err("Property Get/Let/Set is only valid inside a Class"); return parseProperty(); }
            if (kw == "class")    { if (inProc || inClass) err("a Class cannot be defined inside a procedure or another Class"); return parseClass(); }
            if (kw == "with")     return parseWith();
            if (kw == "call")     { adv(); auto e = parsePostfix();
                                    auto s = mk(Stmt::CallS, ln); s->callee = e; return s; }
            if (kw == "exit")     { adv(); auto s = mk(Stmt::ExitS, ln); s->name = toLower(ident("Sub/Function/For/Do/Property")); return s; }
            if (kw == "const")    return parseConst();
            if (kw == "option")   { adv(); expectKw("explicit"); auto s = mk(Stmt::OptionS, ln); s->optExplicit = true; return s; }
            if (kw == "on")       return parseOnError();
            if (kw == "erase")    { adv(); auto s = mk(Stmt::EraseS, ln);
                                    while (true) { s->callArgs.push_back(parsePostfix()); if (is(Tok::Comma)) { adv(); continue; } break; }
                                    return s; }
            if (kw == "public" || kw == "private") {
                adv();
                bool isDef = false;
                if (isKw("default")) { adv(); isDef = true; }   // Public Default Property/Function/Sub
                if (isKw("sub"))      { if (inProc) err("a Sub cannot be defined inside another procedure"); return parseProc(false, isDef); }
                if (isKw("function")) { if (inProc) err("a Function cannot be defined inside another procedure"); return parseProc(true, isDef); }
                if (isKw("property")) { if (inProc) err("a Property cannot be defined inside another procedure"); if (!inClass) err("Property Get/Let/Set is only valid inside a Class"); return parseProperty(isDef); }
                if (isKw("class"))    { if (inProc || inClass) err("a Class cannot be defined inside a procedure or another Class"); return parseClass(); }
                if (isKw("const"))    return parseConst();
                return parseDim(false);   // Public/Private x, y  (treated like Dim)
            }
            if (kw == "default") {   // Default [on its own] implies Public
                adv();
                if (isKw("property")) { if (inProc) err("a Property cannot be defined inside another procedure"); if (!inClass) err("Property Get/Let/Set is only valid inside a Class"); return parseProperty(true); }
                if (isKw("function")) { if (inProc) err("a Function cannot be defined inside another procedure"); return parseProc(true, true); }
                if (isKw("sub"))      { if (inProc) err("a Sub cannot be defined inside another procedure"); return parseProc(false, true); }
                err("Default must be followed by Property, Function, or Sub");
            }
        }
        return parseAssignOrCall();
    }

    StmtP mk(Stmt::K k, int ln) { auto s = std::make_shared<Stmt>(); s->k = k; s->line = ln; return s; }

    // ---- Dim ----
    StmtP parseDim(bool /*unused*/) {
        int ln = cur().line; if (isKw("dim")) adv();   // no keyword when reached via Public/Private
        auto s = mk(Stmt::DimS, ln);
        while (true) {
            std::string nm = ident("variable name");
            std::vector<ExprP> dims;
            if (is(Tok::LParen)) { adv(); dims = parseArgList(Tok::RParen); }
            s->decls.push_back({nm, dims});
            if (is(Tok::Comma)) { adv(); continue; }
            break;
        }
        return s;
    }
    StmtP parseReDim() {
        int ln = cur().line; adv();
        auto s = mk(Stmt::ReDimS, ln);
        if (isKw("preserve")) { adv(); s->preserve = true; }
        s->name = ident("array name");
        expect(Tok::LParen, "(");
        s->dims = parseArgList(Tok::RParen);
        return s;
    }
    StmtP parseSet() {
        int ln = cur().line; adv();
        auto s = mk(Stmt::SetAssign, ln);
        s->target = parsePostfix();
        expect(Tok::Eq, "=");
        s->value = parseExpr();
        return s;
    }
    StmtP parseConst() {
        int ln = cur().line; adv();
        auto s = mk(Stmt::ConstS, ln);
        while (true) {
            std::string nm = ident("const name");
            expect(Tok::Eq, "=");
            s->consts.push_back({nm, parseExpr()});
            if (is(Tok::Comma)) { adv(); continue; }
            break;
        }
        return s;
    }
    StmtP parseOnError() {
        int ln = cur().line; adv();          // On
        expectKw("error");
        auto s = mk(Stmt::OnErrorS, ln);
        if (isKw("resume")) { adv(); expectKw("next"); s->errMode = 1; }
        else { expectKw("goto"); if (is(Tok::Number)) adv(); s->errMode = 0; }  // GoTo 0
        return s;
    }
    StmtP parseIf() {
        int ln = cur().line; adv();
        auto s = mk(Stmt::IfS, ln);
        s->cond = parseExpr();
        expectKw("then");
        if (is(Tok::Eol)) {                          // block form
            skipEol();
            s->body = parseStatements({"elseif", "else", "end"});
            while (isKw("elseif")) {
                adv(); ExprP c = parseExpr(); expectKw("then"); skipEol();
                s->elifs.push_back({c, parseStatements({"elseif", "else", "end"})});
            }
            if (isKw("else")) { adv(); skipEol(); s->elseBody = parseStatements({"end"}); }
            expectKw("end"); expectKw("if");
        } else {                                     // single-line form
            s->body = parseInlineStmts({"else"});
            if (isKw("else")) { adv(); s->elseBody = parseInlineStmts({}); }
        }
        return s;
    }
    StmtP parseFor() {
        int ln = cur().line; adv();
        if (isKw("each")) {
            adv();
            auto s = mk(Stmt::ForEachS, ln);
            s->name = ident("loop variable");
            s->lname = toLower(s->name);
            expectKw("in");
            s->coll = parseExpr();
            skipEol();
            s->body = parseStatements({"next"});
            expectKw("next");
            return s;
        }
        auto s = mk(Stmt::ForS, ln);
        s->name = ident("loop variable");
        s->lname = toLower(s->name);
        expect(Tok::Eq, "=");
        s->fromE = parseExpr();
        expectKw("to");
        s->toE = parseExpr();
        if (isKw("step")) { adv(); s->stepE = parseExpr(); }
        skipEol();
        s->body = parseStatements({"next"});
        expectKw("next");
        if (is(Tok::Ident)) adv();    // optional loop var after Next
        return s;
    }
    StmtP parseDo() {
        int ln = cur().line; adv();
        auto s = mk(Stmt::DoLoopS, ln);
        if (isKw("while")) { adv(); s->testPos = 1; s->isUntil = false; s->cond = parseExpr(); }
        else if (isKw("until")) { adv(); s->testPos = 1; s->isUntil = true; s->cond = parseExpr(); }
        skipEol();
        s->body = parseStatements({"loop"});
        expectKw("loop");
        if (s->testPos == 0) {
            if (isKw("while")) { adv(); s->testPos = 2; s->isUntil = false; s->cond = parseExpr(); }
            else if (isKw("until")) { adv(); s->testPos = 2; s->isUntil = true; s->cond = parseExpr(); }
        }
        return s;
    }
    StmtP parseWhile() {
        int ln = cur().line; adv();
        auto s = mk(Stmt::WhileS, ln);
        s->cond = parseExpr();
        skipEol();
        s->body = parseStatements({"wend"});
        expectKw("wend");
        return s;
    }
    StmtP parseSelect() {
        int ln = cur().line; adv();
        expectKw("case");
        auto s = mk(Stmt::SelectS, ln);
        s->coll = parseExpr();
        skipSeps();
        while (isKw("case")) {
            adv();
            CaseClause cc;
            if (isKw("else")) { adv(); }                 // Case Else
            else {
                while (true) {
                    CaseTest ct;
                    if (isKw("is")) {
                        adv(); ct.k = CaseTest::Is;
                        ct.op = readRelOp();
                        ct.e1 = parseConcat();
                    } else {
                        ct.e1 = parseExpr();
                        if (isKw("to")) { adv(); ct.k = CaseTest::Range; ct.e2 = parseExpr(); }
                        else ct.k = CaseTest::Val;
                    }
                    cc.tests.push_back(ct);
                    if (is(Tok::Comma)) { adv(); continue; }
                    break;
                }
            }
            skipSeps();
            cc.body = parseStatements({"case", "end"});
            s->cases.push_back(std::move(cc));
        }
        expectKw("end"); expectKw("select");
        return s;
    }
    std::string readRelOp() {
        switch (cur().kind) {
            case Tok::Eq: adv(); return "=";
            case Tok::Ne: adv(); return "<>";
            case Tok::Lt: adv(); return "<";
            case Tok::Gt: adv(); return ">";
            case Tok::Le: adv(); return "<=";
            case Tok::Ge: adv(); return ">=";
            default: err("Expected comparison operator"); return "";
        }
    }
    std::vector<Param> parseParams() {
        std::vector<Param> ps;
        expect(Tok::LParen, "(");
        if (!is(Tok::RParen)) {
            while (true) {
                Param pm;
                if (isKw("byval")) { adv(); pm.byVal = true; }
                else if (isKw("byref")) { adv(); pm.byVal = false; }
                pm.name = ident("parameter name");
                pm.lname = toLower(pm.name);
                if (is(Tok::LParen)) { adv(); expect(Tok::RParen, ")"); }  // arr() param
                ps.push_back(pm);
                if (is(Tok::Comma)) { adv(); continue; }
                break;
            }
        }
        expect(Tok::RParen, ")");
        return ps;
    }
    StmtP parseProc(bool isFunc, bool isDefault = false) {
        int ln = cur().line; adv();
        auto s = mk(isFunc ? Stmt::FuncDecl : Stmt::SubDecl, ln);
        s->isFunction = isFunc;
        s->isDefault = isDefault;
        s->name = ident("procedure name");
        s->lname = toLower(s->name);
        if (is(Tok::LParen)) s->params = parseParams();
        skipEol();
        bool savedProc = inProc; inProc = true;
        s->body = parseStatements({"end"});
        inProc = savedProc;
        expectKw("end");
        expectKw(isFunc ? "function" : "sub");
        return s;
    }
    StmtP parseProperty(bool isDefault = false) {
        int ln = cur().line; adv();
        auto s = mk(Stmt::PropDecl, ln);
        s->isDefault = isDefault;
        if (isKw("get")) { s->propKind = 0; adv(); }
        else if (isKw("let")) { s->propKind = 1; adv(); }
        else if (isKw("set")) { s->propKind = 2; adv(); }
        else err("Expected Get/Let/Set");
        s->name = ident("property name");
        s->lname = toLower(s->name);
        if (is(Tok::LParen)) s->params = parseParams();
        skipEol();
        bool savedProc = inProc; inProc = true;
        s->body = parseStatements({"end"});
        inProc = savedProc;
        expectKw("end"); expectKw("property");
        return s;
    }
    StmtP parseClass() {
        int ln = cur().line; adv();
        auto s = mk(Stmt::ClassDecl, ln);
        s->name = ident("class name");
        skipSeps();
        bool savedClass = inClass; inClass = true;
        while (!isKw("end") && !is(Tok::End)) {
            s->members.push_back(parseStatement());
            skipSeps();
        }
        inClass = savedClass;
        expectKw("end"); expectKw("class");
        return s;
    }
    StmtP parseWith() {
        int ln = cur().line; adv();
        auto s = mk(Stmt::WithS, ln);
        s->coll = parseExpr();
        skipEol();
        s->body = parseStatements({"end"});
        expectKw("end"); expectKw("with");
        return s;
    }

    // ---- assignment or call (statement starting with lvalue/callee) ----
    StmtP parseAssignOrCall() {
        int ln = cur().line;
        ExprP lhs = parsePostfix(true);
        if (is(Tok::Eq)) {
            adv();
            // Mid(strVar, start[, length]) = value  — Directive's in-place Mid statement.
            if (lhs->k == Expr::Index && lhs->a && lhs->a->k == Expr::Var &&
                lhs->a->lname == "mid" && lhs->args.size() >= 2 && lhs->args.size() <= 3) {
                auto s = mk(Stmt::MidS, ln);
                s->target = lhs->args[0];                    // the string variable (an lvalue)
                s->callArgs.push_back(lhs->args[1]);         // start (1-based)
                if (lhs->args.size() == 3) s->callArgs.push_back(lhs->args[2]);  // optional length
                s->value = parseExpr();                      // replacement text
                return s;
            }
            auto s = mk(Stmt::Assign, ln);
            s->target = lhs; s->value = parseExpr();
            return s;
        }
        // parenless sub call:  Foo a, b   /   obj.M a, b
        if ((lhs->k == Expr::Var || lhs->k == Expr::Member) && canStartExpr(cur())) {
            auto s = mk(Stmt::CallS, ln);
            s->callee = lhs;
            while (true) {
                if (is(Tok::Comma)) { s->callArgs.push_back(mkLit(Value::empty())); adv(); continue; }
                s->callArgs.push_back(parseExpr());
                if (is(Tok::Comma)) { adv(); continue; }
                break;
            }
            return s;
        }
        auto s = mk(Stmt::CallS, ln);   // bare call:  Foo   /   obj.M   /   Foo(1,2)
        s->callee = lhs;
        return s;
    }

    // ---- expressions (precedence climbing) ----
    ExprP parseExpr() { return parseImp(); }
    ExprP parseImp() { auto l = parseEqv(); while (isKw("imp")) { adv(); l = mkBinary("Imp", l, parseEqv()); } return l; }
    ExprP parseEqv() { auto l = parseXor(); while (isKw("eqv")) { adv(); l = mkBinary("Eqv", l, parseXor()); } return l; }
    ExprP parseXor() { auto l = parseOr();  while (isKw("xor")) { adv(); l = mkBinary("Xor", l, parseOr()); } return l; }
    ExprP parseOr()  { auto l = parseAnd(); while (isKw("or"))  { adv(); l = mkBinary("Or", l, parseAnd()); } return l; }
    ExprP parseAnd() { auto l = parseNot(); while (isKw("and")) { adv(); l = mkBinary("And", l, parseNot()); } return l; }
    ExprP parseNot() { if (isKw("not")) { adv(); return mkUnary("Not", parseNot()); } return parseCmp(); }
    ExprP parseCmp() {
        auto l = parseConcat();
        while (true) {
            std::string op;
            switch (cur().kind) {
                case Tok::Eq: op = "="; break;   case Tok::Ne: op = "<>"; break;
                case Tok::Lt: op = "<"; break;   case Tok::Gt: op = ">"; break;
                case Tok::Le: op = "<="; break;  case Tok::Ge: op = ">="; break;
                default: if (isKw("is")) op = "Is"; break;
            }
            if (op.empty()) break;
            adv();
            l = mkBinary(op, l, parseConcat());
        }
        return l;
    }
    ExprP parseConcat() { auto l = parseAdd(); while (is(Tok::Amp)) { adv(); l = mkBinary("&", l, parseAdd()); } return l; }
    ExprP parseAdd() {
        auto l = parseModL();
        while (is(Tok::Plus) || is(Tok::Minus)) {
            std::string op = is(Tok::Plus) ? "+" : "-"; adv();
            l = mkBinary(op, l, parseModL());
        }
        return l;
    }
    ExprP parseModL() { auto l = parseIntDiv(); while (isKw("mod")) { adv(); l = mkBinary("Mod", l, parseIntDiv()); } return l; }
    ExprP parseIntDiv() { auto l = parseMul(); while (is(Tok::Backslash)) { adv(); l = mkBinary("\\", l, parseMul()); } return l; }
    ExprP parseMul() {
        auto l = parseNeg();
        while (is(Tok::Star) || is(Tok::Slash)) {
            std::string op = is(Tok::Star) ? "*" : "/"; adv();
            l = mkBinary(op, l, parseNeg());
        }
        return l;
    }
    ExprP parseNeg() {
        if (is(Tok::Minus)) { adv(); return mkUnary("-", parseNeg()); }
        if (is(Tok::Plus))  { adv(); return parseNeg(); }
        return parsePow();
    }
    ExprP parsePow() {
        auto base = parsePostfix();
        if (is(Tok::Caret)) { adv(); return mkBinary("^", base, parseNeg()); }
        return base;
    }
    ExprP parsePostfix(bool stopAtSpacedDot = false) {
        ExprP e = parsePrimary();
        while (true) {
            if (is(Tok::Dot)) {
                if (stopAtSpacedDot && gapBefore()) break;   // it is an argument, not a member
                adv(); e = mkMember(e, ident("member name"));
            }
            else if (is(Tok::LParen)) { adv(); e = mkIndex(e, parseArgList(Tok::RParen)); }
            else break;
        }
        return e;
    }
    ExprP parsePrimary() {
        if (is(Tok::Number)) { Value v = cur().num; adv(); return mkLit(v); }
        if (is(Tok::String)) { std::string s = cur().str; adv(); return mkLit(Value::str(s)); }
        if (is(Tok::DateLit)) { double ser; if (!parseDateToSerial(cur().str, ser)) err("Invalid date literal '#" + cur().str + "#'"); adv(); return mkLit(Value::number(ser)); }
        if (is(Tok::Dot))    { adv(); return mkMember(nullptr, ident("member name")); }  // With-member
        if (is(Tok::LParen)) { adv(); auto e = parseExpr(); expect(Tok::RParen, ")"); return e; }
        if (is(Tok::Ident)) {
            if (!cur().bracketed) {   // [ident] is always a name, never a literal keyword
                const std::string& lo = cur().lower;
                if (lo == "true")    { adv(); return mkLit(Value::boolean(true)); }
                if (lo == "false")   { adv(); return mkLit(Value::boolean(false)); }
                if (lo == "nothing") { adv(); return mkLit(Value::nothing()); }
                if (lo == "empty")   { adv(); return mkLit(Value::empty()); }
                if (lo == "null")    { adv(); return mkLit(Value::null()); }
                if (lo == "new")     { adv(); return mkNew(ident("class name")); }
            }
            std::string nm = cur().text; adv(); return mkVar(nm);
        }
        err("Expected expression");
        return nullptr;
    }
    std::vector<ExprP> parseArgList(Tok close) {
        std::vector<ExprP> args;
        if (is(close)) { adv(); return args; }
        while (true) {
            if (is(Tok::Comma)) { args.push_back(mkLit(Value::empty())); adv(); continue; }
            if (is(close)) break;
            args.push_back(parseExpr());
            if (is(Tok::Comma)) { adv(); continue; }
            break;
        }
        expect(close, ")");
        return args;
    }
};

// ============================================================ NATIVE OBJECTS
struct QuitSignal { int code; };   // thrown by Directive.Quit

// Directive.Sleep — real millisecond sleep (platform impl further down).
static void dirSleepMs(long long ms);

// Full path of the running interpreter, for Directive.FullName. Testing it with
// InStr is how a script tells the console build from the windowed one.
static std::string g_hostExe;
static std::string hostExePath();

static Value makeArray(std::vector<Value> items) {
    auto ad = std::make_shared<ArrayData>();
    ad->uppers = { (int)items.size() - 1 };
    ad->data = std::move(items);
    return Value::array(ad);
}

// ---- Err ----
struct ErrObject : IObject {
    long number = 0;
    std::string source, description;
    std::string typeName() const override { return "ErrObject"; }
    void clear() { number = 0; source.clear(); description.clear(); }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "number")      return Value::integer((int32_t)number);
        if (n == "description") return Value::str(description);
        if (n == "source")      return Value::str(source);
        if (n == "clear")       { clear(); return Value::empty(); }
        if (n == "raise") {
            long num = args.size() > 0 ? args[0].toI64() : 0;
            std::string src = args.size() > 1 && !args[1].isEmpty() ? args[1].toStr() : "";
            std::string des = args.size() > 2 && !args[2].isEmpty() ? args[2].toStr()
                                                                    : ("Error " + std::to_string(num));
            throw DirectiveError(num, des, src.empty() ? "Directive runtime error" : src);
        }
        raiseErr(438, "Err: unknown member " + name);
    }
    void set(Interpreter&, const std::string& name, std::vector<Value>&, const Value& v, bool) override {
        std::string n = toLower(name);
        if (n == "number")           number = v.toI64();
        else if (n == "description") description = v.toStr();
        else if (n == "source")      source = v.toStr();
        else raiseErr(438, "Err: cannot set " + name);
    }
};

// ---- Directive.StdOut / .StdErr / .StdIn ----
// Output streams always use std::cout/std::cerr; stdin uses std::cin. In a GUI
// build these are wired to the parent console (if any) via AttachConsole in WinMain.
struct ConsoleStream : IObject {
    int which;   // 0 = stdout, 1 = stderr, 2 = stdin
    long inLine = 1, inCol = 1;          // StdIn position, for Line/Column
    explicit ConsoleStream(int w) : which(w) {}
    void countRead(const std::string& s) {
        for (char c : s) { if (c == '\n') { ++inLine; inCol = 1; } else ++inCol; }
    }
    std::string typeName() const override { return "TextStream"; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (which != 2) {
            std::ostream& os = (which == 1) ? std::cerr : std::cout;
            if (n == "write")           { os << (args.empty() ? "" : args[0].toConcatStr()); return Value::empty(); }
            if (n == "writeline")        { os << (args.empty() ? "" : args[0].toConcatStr()) << "\n"; return Value::empty(); }
            if (n == "writeblanklines")  { long k = args.empty() ? 1 : args[0].toI64(); for (long i = 0; i < k; ++i) os << "\n"; return Value::empty(); }
            if (n == "close" || n == "flush") { os.flush(); return Value::empty(); }
        } else {
            // Mirrors VBScript's TextStream: Read/ReadAll/ReadLine/SkipLine all
            // raise error 62 at end of file, and Line/Column are 1-based.
            if (n == "readline") {
                std::string l;
                if (!std::getline(std::cin, l)) raiseErr(62, "Input past end of file");
                ++inLine; inCol = 1;
                return Value::str(l);
            }
            if (n == "read") {
                long k = args.empty() ? 1 : (long)args[0].toI64();
                if (k <= 0) return Value::str("");
                std::string buf((size_t)k, '\0');
                std::cin.read(&buf[0], k);
                buf.resize((size_t)std::cin.gcount());
                if (buf.empty()) raiseErr(62, "Input past end of file");
                countRead(buf);
                return Value::str(buf);
            }
            if (n == "readall") {
                std::ostringstream ss; ss << std::cin.rdbuf();
                std::string s = ss.str();
                if (s.empty()) raiseErr(62, "Input past end of file");
                countRead(s);
                return Value::str(s);
            }
            if (n == "skip") {
                long k = args.empty() ? 0 : (long)args[0].toI64();
                for (long i = 0; i < k; ++i) {
                    int ch = std::cin.get();
                    if (ch == EOF) raiseErr(62, "Input past end of file");
                    countRead(std::string(1, (char)ch));
                }
                return Value::empty();
            }
            if (n == "skipline") {
                std::string l;
                if (!std::getline(std::cin, l)) raiseErr(62, "Input past end of file");
                ++inLine; inCol = 1;
                return Value::empty();
            }
            if (n == "atendofstream") return Value::boolean(std::cin.peek() == EOF);
            if (n == "atendofline")   { int c = std::cin.peek(); return Value::boolean(c == EOF || c == '\n'); }
            if (n == "line")          return Value::integer((int32_t)inLine);
            if (n == "column")        return Value::integer((int32_t)inCol);
            if (n == "close")         return Value::empty();
        }
        raiseErr(438, "TextStream: unknown member " + name);
    }
};

// Shell helpers. Run/Exec are cross-platform (defined earlier); registry,
// special-folder, and env-enumeration helpers are platform-specific (below).
static int  shellRun(const std::string& cmd, bool wait);
static bool shellExec(const std::string& cmd, std::string& out, int& exitCode);
static std::string shellRegRead(const std::string& key);
static void shellRegWrite(const std::string& key, const Value& v, const std::string& type);
static void shellRegDelete(const std::string& key);
static std::string shellSpecialFolder(const std::string& name);
static std::vector<std::string> shellEnvStrings();   // "NAME=VALUE" for each env var
static ObjectPtr shellMakeShortcut(const std::string& path);   // Windows-only (IShellLink)
static bool shellAppActivate(const std::string& title);        // Windows-only

// ============================================================ Shell object
// Native, cross-platform replacement for the classic Windows shell. Created with
// `New Shell` so scripts don't depend on COM surviving. Run/Exec/Environment/
// CurrentDirectory/ExpandEnvironmentStrings/Popup work everywhere; registry and
// SpecialFolders are Windows-only (raise a clear error on other platforms).

// In-memory readable text stream (backs Shell.Exec's .StdOut).
struct ExecReadStream : IObject {
    std::string data; size_t pos = 0;
    explicit ExecReadStream(std::string d) : data(std::move(d)) {}
    std::string typeName() const override { return "TextStream"; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>&) override {
        std::string n = toLower(name);
        if (n == "readall")  { std::string r = data.substr(pos); pos = data.size(); return Value::str(r); }
        if (n == "readline") {
            if (pos >= data.size()) raiseErr(62, "Input past end of file");
            size_t nl = data.find('\n', pos);
            std::string line = (nl == std::string::npos) ? data.substr(pos) : data.substr(pos, nl - pos);
            pos = (nl == std::string::npos) ? data.size() : nl + 1;
            if (!line.empty() && line.back() == '\r') line.pop_back();
            return Value::str(line);
        }
        if (n == "atendofstream" || n == "atendofline") return Value::boolean(pos >= data.size());
        if (n == "read")  { long k = 0; return Value::str(std::string()); (void)k; }
        if (n == "close") return Value::empty();
        raiseErr(438, "TextStream: unknown member " + name);
    }
};

// Result of Shell.Exec: exposes .StdOut (captured), .ExitCode, .Status.
struct ExecResultObject : IObject {
    std::shared_ptr<ExecReadStream> outStream;
    int exitCode = 0;
    ExecResultObject(std::string out, int code)
        : outStream(std::make_shared<ExecReadStream>(std::move(out))), exitCode(code) {}
    std::string typeName() const override { return "ExecResult"; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>&) override {
        std::string n = toLower(name);
        if (n == "stdout")   return Value::object(outStream);
        if (n == "stderr")   return Value::object(std::make_shared<ExecReadStream>(""));  // not captured separately
        if (n == "exitcode") return Value::integer((int32_t)exitCode);
        if (n == "status")   return Value::integer(1);   // synchronous: always complete
        if (n == "terminate") return Value::empty();
        raiseErr(438, "ExecResult: unknown member " + name);
    }
};

// Shell.Environment collection: env("NAME") reads/writes a variable; Count and
// For Each enumerate "NAME=VALUE" entries.
struct EnvObject : IObject {
    std::string typeName() const override { return "EnvVars"; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "count") return Value::integer((int32_t)shellEnvStrings().size());
        if (n.empty() || n == "item") {
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            const char* v = getenv(args[0].toStr().c_str());
            return Value::str(v ? v : "");
        }
        if (n == "remove") {
            if (!args.empty()) {
                std::string var = args[0].toStr();
#ifdef _WIN32
                _putenv_s(var.c_str(), "");
#else
                unsetenv(var.c_str());
#endif
            }
            return Value::empty();
        }
        raiseErr(438, "EnvVars: unknown member " + name);
    }
    void set(Interpreter&, const std::string& name, std::vector<Value>& args, const Value& val, bool) override {
        std::string n = toLower(name);
        std::string var = (n.empty() || n == "item") ? (args.empty() ? std::string() : args[0].toStr()) : name;
        if (var.empty()) raiseErr(450, "Wrong number of arguments");
#ifdef _WIN32
        _putenv_s(var.c_str(), val.toStr().c_str());
#else
        setenv(var.c_str(), val.toStr().c_str(), 1);
#endif
    }
    bool enumerate(Interpreter&, std::vector<Value>& out) override {
        for (auto& s : shellEnvStrings()) out.push_back(Value::str(s));
        return true;
    }
};

struct ShellObject : IObject {
    std::string typeName() const override { return "Shell"; }
    static std::string expandEnv(const std::string& s) {
        std::string out; size_t i = 0;
        while (i < s.size()) {
            if (s[i] == '%') {
                size_t e = s.find('%', i + 1);
                if (e != std::string::npos) {
                    std::string var = s.substr(i + 1, e - i - 1);
                    if (var.empty()) { out += '%'; i = e + 1; continue; }
                    const char* v = getenv(var.c_str());
                    out += v ? v : ("%" + var + "%");
                    i = e + 1; continue;
                }
            }
            out += s[i++];
        }
        return out;
    }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "run") {
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            bool wait = (args.size() >= 3) && args[2].toBool();     // args[1] = window style (ignored off-Windows)
            return Value::integer((int32_t)shellRun(args[0].toStr(), wait));
        }
        if (n == "exec") {
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            std::string out; int code = 0;
            if (!shellExec(args[0].toStr(), out, code)) raiseErr(5, "Exec: failed to start process");
            return Value::object(std::make_shared<ExecResultObject>(out, code));
        }
        if (n == "currentdirectory") { std::error_code ec; return Value::str(fs::current_path(ec).string()); }
        if (n == "expandenvironmentstrings") return Value::str(expandEnv(args.empty() ? "" : args[0].toStr()));
        if (n == "environment") return Value::object(std::make_shared<EnvObject>());
        if (n == "popup") {
            std::string text  = args.empty() ? "" : args[0].toStr();  // args[1] = seconds (console can't auto-close)
            std::string title = (args.size() >= 3) ? args[2].toStr() : "";
            long type = (args.size() >= 4) ? (long)args[3].toI64() : 0;
            return Value::integer((int32_t)ui::msgBox(text, type, title));
        }
        if (n == "regread")   return Value::str(shellRegRead(args.empty() ? "" : args[0].toStr()));
        if (n == "regwrite")  { shellRegWrite(args.empty()?"":args[0].toStr(), args.size()>1?args[1]:Value::empty(), args.size()>2?args[2].toStr():"REG_SZ"); return Value::empty(); }
        if (n == "regdelete") { shellRegDelete(args.empty()?"":args[0].toStr()); return Value::empty(); }
        if (n == "specialfolders") return Value::str(shellSpecialFolder(args.empty() ? "" : args[0].toStr()));
        if (n == "createshortcut") { if (args.empty()) raiseErr(5, "CreateShortcut requires a path"); return Value::object(shellMakeShortcut(args[0].toStr())); }
        if (n == "appactivate")    return Value::boolean(shellAppActivate(args.empty() ? "" : args[0].toStr()));
        raiseErr(438, "Shell: unknown member " + name);
    }
    void set(Interpreter&, const std::string& name, std::vector<Value>&, const Value& val, bool) override {
        std::string n = toLower(name);
        if (n == "currentdirectory") { std::error_code ec; fs::current_path(val.toStr(), ec); if (ec) raiseErr(76, "Path not found"); return; }
        raiseErr(438, "Shell: unknown property " + name);
    }
};

// ---- Directive (host object) ----
// A 0-based collection of the command-line arguments passed to the
// script. Supports Count/Length, Item(i), the default index
// Arguments(i), and For Each iteration.
struct ArgumentsObject : IObject {
    std::vector<Value> items;
    ArgumentsObject() = default;
    explicit ArgumentsObject(const std::vector<std::string>& a) { for (auto& s : a) items.push_back(Value::str(s)); }
    std::string typeName() const override { return "Arguments"; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "count" || n == "length") return Value::integer((int32_t)items.size());
        if (n.empty() || n == "item") {
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            long i = (long)args[0].toI64();
            if (i < 0 || i >= (long)items.size()) raiseErr(9, "Subscript out of range");
            return items[(size_t)i];
        }
        raiseErr(438, "Arguments: unknown member " + name);
    }
    bool enumerate(Interpreter&, std::vector<Value>& out) override { out = items; return true; }
};

struct DirectiveObject : IObject {
    std::string scriptName = "script.ds";
    std::string scriptFullName;                 // absolute path of the running script ("" for -e/stdin)
    std::string scriptDir;                       // directory containing the script (AutoIt @ScriptDir)
    std::vector<std::string> scriptArgs;         // command-line arguments after the script path
    std::string typeName() const override { return "Directive"; }
    Value get(Interpreter& in, const std::string& name, std::vector<Value>& args) override {
        (void)in;
        std::string n = toLower(name);
        if (n == "arguments" || n == "args") {
            auto ao = std::make_shared<ArgumentsObject>(scriptArgs);
            if (!args.empty()) return ao->get(in, "", args);   // Directive.Arguments(i) -> item i
            return Value::object(ao);
        }
        if (n == "echo") {
            std::string out;
            for (size_t k = 0; k < args.size(); ++k) { if (k) out += " "; out += args[k].toConcatStr(); }
            ui::echo(out);
            return Value::empty();
        }
        if (n == "stdout")     return Value::object(std::make_shared<ConsoleStream>(0));
        if (n == "stderr")     return Value::object(std::make_shared<ConsoleStream>(1));
        if (n == "stdin")      return Value::object(std::make_shared<ConsoleStream>(2));
        if (n == "sleep")      { dirSleepMs(args.empty() ? 0 : args[0].toI64()); return Value::empty(); }
        if (n == "quit")       throw QuitSignal{ args.empty() ? 0 : (int)args[0].toI64() };
        // Host identity: FullName/Path/Name describe the interpreter itself,
        // while the Script* members describe the script being run.
        if (n == "fullname")   return Value::str(g_hostExe);
        if (n == "path") {
            size_t cut = g_hostExe.find_last_of("/\\");
            return Value::str(cut == std::string::npos ? std::string() : g_hostExe.substr(0, cut));
        }
        if (n == "name")       return Value::str("Directive Script Host");
        if (n == "scriptname")     return Value::str(scriptName);
        if (n == "scriptfullname") return Value::str(scriptFullName);
        if (n == "scriptpath" || n == "scriptdir") return Value::str(scriptDir);
        raiseErr(438, "Directive: unknown member " + name);
    }
};

// ---- List (native doubly-linked list) ----
struct ListObject : IObject {
    std::list<Value> data;
    std::string typeName() const override { return "List"; }

    static bool eq(const Value& a, const Value& b) {
        if (a.isObject() || b.isObject())
            return a.isObject() && b.isObject() && a.obj.get() == b.obj.get();
        bool an = a.looksNumeric(), bn = b.looksNumeric();
        if (a.type == Value::Type::String || b.type == Value::Type::String)
            if (!(an && bn)) return a.toStr() == b.toStr();
        return a.toDouble() == b.toDouble();
    }
    std::list<Value>::iterator at(long i) {
        if (i < 0 || i >= (long)data.size()) raiseErr(9, "Subscript out of range");
        auto it = data.begin(); std::advance(it, i); return it;
    }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n.empty() || n == "item") {                       // default: Item(index)
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            return *at(args[0].toI64());
        }
        if (n == "add" || n == "append" || n == "push") { for (auto& a : args) data.push_back(a); return Value::empty(); }
        if (n == "insert") {                                  // Insert index, value
            if (args.size() < 2) raiseErr(450, "Wrong number of arguments");
            long i = args[0].toI64();
            if (i < 0 || i > (long)data.size()) raiseErr(9, "Subscript out of range");
            auto it = data.begin(); std::advance(it, i); data.insert(it, args[1]);
            return Value::empty();
        }
        if (n == "removeat") { if (args.empty()) raiseErr(450, "Wrong number of arguments"); data.erase(at(args[0].toI64())); return Value::empty(); }
        if (n == "remove") {                                  // Remove value -> bool found
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            for (auto it = data.begin(); it != data.end(); ++it)
                if (eq(*it, args[0])) { data.erase(it); return Value::boolean(true); }
            return Value::boolean(false);
        }
        if (n == "clear")    { data.clear(); return Value::empty(); }
        if (n == "count")    return Value::integer((int32_t)data.size());
        if (n == "contains") { for (auto& v : data) if (!args.empty() && eq(v, args[0])) return Value::boolean(true); return Value::boolean(false); }
        if (n == "indexof")  { long i = 0; for (auto& v : data) { if (!args.empty() && eq(v, args[0])) return Value::integer((int32_t)i); ++i; } return Value::integer(-1); }
        if (n == "swap") {                                    // Swap i, j
            if (args.size() < 2) raiseErr(450, "Wrong number of arguments");
            std::iter_swap(at(args[0].toI64()), at(args[1].toI64())); return Value::empty();
        }
        if (n == "reverse")  { data.reverse(); return Value::empty(); }
        if (n == "sort") {
            std::vector<Value> v(data.begin(), data.end());
            std::sort(v.begin(), v.end(), [](const Value& a, const Value& b) {
                bool an = a.looksNumeric(), bn = b.looksNumeric();
                if (an && bn) return a.toDouble() < b.toDouble();
                return a.toStr() < b.toStr();
            });
            data.assign(v.begin(), v.end()); return Value::empty();
        }
        if (n == "first")   { if (data.empty()) raiseErr(9, "List is empty"); return data.front(); }
        if (n == "last")    { if (data.empty()) raiseErr(9, "List is empty"); return data.back(); }
        if (n == "toarray") { return makeArray(std::vector<Value>(data.begin(), data.end())); }
        raiseErr(438, "List: unknown member " + name);
    }
    void set(Interpreter&, const std::string& name, std::vector<Value>& args, const Value& v, bool) override {
        std::string n = toLower(name);
        if (n.empty() || n == "item") { if (args.empty()) raiseErr(450, "Wrong number of arguments"); *at(args[0].toI64()) = v; return; }
        raiseErr(438, "List: cannot set " + name);
    }
    bool enumerate(Interpreter&, std::vector<Value>& out) override { for (auto& v : data) out.push_back(v); return true; }
};

// ---- Scripting.Dictionary ----
// Directive Dictionary keys are typed: numeric 1 and string "1" are different keys,
// and object keys compare by identity. Encode type + value so they don't collide.
static std::string dictKey(const Value& v) {
    switch (v.type) {
        case Value::Type::Empty:  return "\x01""e";
        case Value::Type::Null:   return "\x01""z";
        case Value::Type::Bool:   return std::string("\x01""b") + (v.b ? "1" : "0");
        case Value::Type::Int:
        case Value::Type::Double: return "\x01""n" + v.toStr();          // 1 and 1.0 → same numeric key
        case Value::Type::String: return "\x01""s" + v.s;
        case Value::Type::Object: { char b[24]; std::snprintf(b, sizeof(b), "\x01o%p", (void*)v.obj.get()); return b; }
        default:                  return "\x01?" + v.toStr();
    }
}

struct DictionaryObject : IObject {
    std::vector<std::pair<Value, Value>> entries;      // insertion order
    std::unordered_map<std::string, size_t> index;
    std::string typeName() const override { return "Dictionary"; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n.empty() || n == "item") {                // default property
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            std::string k = dictKey(args[0]);
            auto it = index.find(k);
            if (it != index.end()) return entries[it->second].second;
            // Scripting.Dictionary quirk, mirrored deliberately: reading a key that
            // does not exist ADDS it with an empty value, so Count grows on read.
            index[k] = entries.size();
            entries.push_back({ args[0], Value::empty() });
            return Value::empty();
        }
        if (n == "add") {
            if (args.size() < 2) raiseErr(450, "Wrong number of arguments");
            std::string k = dictKey(args[0]);
            if (index.count(k)) raiseErr(457, "This key is already associated with an element of this collection");
            index[k] = entries.size();
            entries.push_back({ args[0], args[1] });
            return Value::empty();
        }
        if (n == "exists") return Value::boolean(!args.empty() && index.count(dictKey(args[0])) > 0);
        if (n == "keys")   { std::vector<Value> v; for (auto& e : entries) v.push_back(e.first);  return makeArray(v); }
        if (n == "items")  { std::vector<Value> v; for (auto& e : entries) v.push_back(e.second); return makeArray(v); }
        if (n == "count")  return Value::integer((int32_t)entries.size());
        if (n == "remove") {
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            std::string k = dictKey(args[0]);
            auto it = index.find(k);
            if (it == index.end()) raiseErr(32811, "Element not found");
            entries.erase(entries.begin() + it->second);
            reindex();
            return Value::empty();
        }
        if (n == "removeall") { entries.clear(); index.clear(); return Value::empty(); }
        if (n == "comparemode") return Value::integer(0);
        raiseErr(438, "Dictionary: unknown member " + name);
    }
    void set(Interpreter&, const std::string& name, std::vector<Value>& args, const Value& v, bool) override {
        std::string n = toLower(name);
        if (n.empty() || n == "item") {                // d(key) = v  or  d.Item(key) = v
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            std::string k = dictKey(args[0]);
            auto it = index.find(k);
            if (it == index.end()) { index[k] = entries.size(); entries.push_back({ args[0], v }); }
            else entries[it->second].second = v;
            return;
        }
        if (n == "comparemode") return;                // ignored
        raiseErr(438, "Dictionary: cannot set " + name);
    }
    bool enumerate(Interpreter&, std::vector<Value>& out) override {
        for (auto& e : entries) out.push_back(e.first);   // For Each iterates keys
        return true;
    }
private:
    void reindex() { index.clear(); for (size_t k = 0; k < entries.size(); ++k) index[dictKey(entries[k].first)] = k; }
};

// ---- RegExp (the RegExp object) with a compact Match/Matches model ----
struct MatchObject : IObject {
    std::string value; long firstIndex = 0, length = 0;
    std::vector<Value> subs;
    std::string typeName() const override { return "Match"; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n.empty() || n == "value") return Value::str(value);
        if (n == "firstindex")         return Value::integer((int32_t)firstIndex);
        if (n == "length")             return Value::integer((int32_t)length);
        if (n == "submatches") {
            if (args.empty()) return makeArray(subs);
            long i = args[0].toI64();
            if (i < 0 || i >= (long)subs.size()) raiseErr(9, "Subscript out of range");
            return subs[i];
        }
        raiseErr(438, "Match: unknown member " + name);
    }
    bool tryDefault(Interpreter&, Value& out) override { out = Value::str(value); return true; }
};
struct MatchCollection : IObject {
    std::vector<Value> items;
    std::string typeName() const override { return "MatchCollection"; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "count") return Value::integer((int32_t)items.size());
        if (n.empty() || n == "item") {
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            long i = args[0].toI64();
            if (i < 0 || i >= (long)items.size()) raiseErr(9, "Subscript out of range");
            return items[i];
        }
        raiseErr(438, "MatchCollection: unknown member " + name);
    }
    bool enumerate(Interpreter&, std::vector<Value>& out) override { out = items; return true; }
};
struct RegExpObject : IObject {
    std::string pattern;
    bool global = false, ignoreCase = false, multiLine = false;
    std::string typeName() const override { return "RegExp"; }
    std::regex build() {
        auto f = std::regex::ECMAScript;
        if (ignoreCase) f |= std::regex::icase;
        if (multiLine)  f |= std::regex::multiline;
        try { return std::regex(pattern, f); }
        catch (const std::regex_error& e) {
            // VBScript reports a specific code per malformed construct.
            int code = 5017;                                   // Syntax error in regular expression
            switch (e.code()) {
                case std::regex_constants::error_brack:     code = 5019; break;  // Expected ']'
                case std::regex_constants::error_paren:     code = 5020; break;  // Expected ')'
                case std::regex_constants::error_range:     code = 5021; break;  // Invalid range in character set
                case std::regex_constants::error_badrepeat: code = 5018; break;  // Unexpected quantifier
                default: break;
            }
            raiseErr(code, std::string("Invalid regex pattern: ") + e.what());
        }
        catch (const std::exception& e) { raiseErr(5017, std::string("Invalid regex pattern: ") + e.what()); }
    }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "pattern")    return Value::str(pattern);
        if (n == "global")     return Value::boolean(global);
        if (n == "ignorecase") return Value::boolean(ignoreCase);
        if (n == "multiline")  return Value::boolean(multiLine);
        if (n == "test") {
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            std::regex re = build();
            return Value::boolean(std::regex_search(args[0].toStr(), re));
        }
        if (n == "replace") {
            if (args.size() < 2) raiseErr(450, "Wrong number of arguments");
            std::regex re = build();
            std::string input = args[0].toStr(), rep = args[1].toStr();
            auto fl = std::regex_constants::format_default;
            if (!global) fl |= std::regex_constants::format_first_only;
            return Value::str(std::regex_replace(input, re, rep, fl));
        }
        if (n == "execute") {
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            std::regex re = build();
            std::string input = args[0].toStr();
            auto mc = std::make_shared<MatchCollection>();
            auto begin = std::sregex_iterator(input.begin(), input.end(), re);
            auto end   = std::sregex_iterator();
            for (auto it = begin; it != end; ++it) {
                std::smatch m = *it;
                auto mo = std::make_shared<MatchObject>();
                mo->value = m.str(0);
                mo->firstIndex = (long)m.position(0);
                mo->length = (long)m.length(0);
                for (size_t g = 1; g < m.size(); ++g) mo->subs.push_back(Value::str(m.str(g)));
                mc->items.push_back(Value::object(mo));
                if (!global) break;
            }
            return Value::object(mc);
        }
        raiseErr(438, "RegExp: unknown member " + name);
    }
    void set(Interpreter&, const std::string& name, std::vector<Value>&, const Value& v, bool) override {
        std::string n = toLower(name);
        if (n == "pattern")         pattern = v.toStr();
        else if (n == "global")     global = v.toBool();
        else if (n == "ignorecase") ignoreCase = v.toBool();
        else if (n == "multiline")  multiLine = v.toBool();
        else raiseErr(438, "RegExp: cannot set " + name);
    }
};

// ---- Scripting.FileSystemObject + TextStream ----
// -------- portable UTF-8 <-> UTF-16 codec (for FileSystemObject Unicode files) --------
// Decode UTF-16 bytes to UTF-8 (le = little-endian); handles surrogate pairs.
static std::string utf16BytesToUtf8(const std::string& bytes, bool le) {
    std::string out;
    size_t n = bytes.size() & ~size_t(1);
    auto unit = [&](size_t i)->uint32_t {
        unsigned char a = (unsigned char)bytes[i], b = (unsigned char)bytes[i + 1];
        return le ? (uint32_t(a) | (uint32_t(b) << 8)) : (uint32_t(b) | (uint32_t(a) << 8));
    };
    for (size_t i = 0; i < n; i += 2) {
        uint32_t cp = unit(i);
        if (cp >= 0xD800 && cp <= 0xDBFF && i + 3 < n) {           // high surrogate
            uint32_t lo = unit(i + 2);
            if (lo >= 0xDC00 && lo <= 0xDFFF) { cp = 0x10000 + ((cp - 0xD800) << 10) + (lo - 0xDC00); i += 2; }
        }
        if (cp < 0x80) out += (char)cp;
        else if (cp < 0x800) { out += (char)(0xC0 | (cp >> 6)); out += (char)(0x80 | (cp & 0x3F)); }
        else if (cp < 0x10000) { out += (char)(0xE0 | (cp >> 12)); out += (char)(0x80 | ((cp >> 6) & 0x3F)); out += (char)(0x80 | (cp & 0x3F)); }
        else { out += (char)(0xF0 | (cp >> 18)); out += (char)(0x80 | ((cp >> 12) & 0x3F)); out += (char)(0x80 | ((cp >> 6) & 0x3F)); out += (char)(0x80 | (cp & 0x3F)); }
    }
    return out;
}
// Encode UTF-8 to UTF-16LE bytes; invalid sequences become U+FFFD.
static std::string utf8ToUtf16LEBytes(const std::string& s) {
    std::string out;
    size_t i = 0, n = s.size();
    auto push16 = [&](uint32_t u){ out += (char)(u & 0xFF); out += (char)((u >> 8) & 0xFF); };
    while (i < n) {
        unsigned char c = (unsigned char)s[i];
        uint32_t cp; int len;
        if (c < 0x80) { cp = c; len = 1; }
        else if ((c >> 5) == 0x6)  { cp = c & 0x1F; len = 2; }
        else if ((c >> 4) == 0xE)  { cp = c & 0x0F; len = 3; }
        else if ((c >> 3) == 0x1E) { cp = c & 0x07; len = 4; }
        else { push16(0xFFFD); ++i; continue; }
        if (i + (size_t)len > n) { push16(0xFFFD); ++i; continue; }
        bool ok = true;
        for (int k = 1; k < len; ++k) { unsigned char cc = (unsigned char)s[i + k]; if ((cc & 0xC0) != 0x80) { ok = false; break; } cp = (cp << 6) | (cc & 0x3F); }
        if (!ok) { push16(0xFFFD); ++i; continue; }
        i += len;
        if (cp > 0xFFFF) { cp -= 0x10000; push16(0xD800 + (cp >> 10)); push16(0xDC00 + (cp & 0x3FF)); }
        else push16(cp);
    }
    return out;
}

struct TextStreamObject : IObject {
    std::vector<std::string> lines;   // for reading (decoded to UTF-8)
    size_t linePos = 0;
    std::shared_ptr<std::ofstream> out;   // for writing
    bool utf16 = false;               // write UTF-16LE (with BOM) instead of UTF-8
    std::string typeName() const override { return "TextStream"; }
    void writeText(const std::string& s) {            // s is UTF-8
        if (!out) return;
        if (utf16) { std::string b = utf8ToUtf16LEBytes(s); out->write(b.data(), (std::streamsize)b.size()); }
        else out->write(s.data(), (std::streamsize)s.size());
    }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "write")     { writeText(args.empty() ? "" : args[0].toConcatStr()); return Value::empty(); }
        if (n == "writeline") { std::string s = args.empty() ? "" : args[0].toConcatStr(); s += utf16 ? "\r\n" : "\n"; writeText(s); return Value::empty(); }
        if (n == "readline")  { if (linePos < lines.size()) return Value::str(lines[linePos++]); raiseErr(62, "Input past end of file"); }
        if (n == "readall")   { std::string all; for (size_t k = linePos; k < lines.size(); ++k) { if (k > linePos) all += "\n"; all += lines[k]; } linePos = lines.size(); return Value::str(all); }
        if (n == "atendofstream") return Value::boolean(linePos >= lines.size());
        if (n == "close")     { if (out) { out->close(); out.reset(); } return Value::empty(); }
        raiseErr(438, "TextStream: unknown member " + name);
    }
};

// Read a file, honoring/sniffing encoding, returning UTF-8 (BOM stripped), split
// into lines. forceFormat: -1 force UTF-16LE (if no BOM), else UTF-8/raw. A BOM
// always wins over forceFormat.
static void fsReadLines(std::istream& f, int forceFormat, std::vector<std::string>& lines) {
    std::string raw((std::istreambuf_iterator<char>(f)), std::istreambuf_iterator<char>());
    std::string text;
    if (raw.size() >= 3 && (unsigned char)raw[0] == 0xEF && (unsigned char)raw[1] == 0xBB && (unsigned char)raw[2] == 0xBF)
        text = raw.substr(3);                                     // UTF-8 BOM
    else if (raw.size() >= 2 && (unsigned char)raw[0] == 0xFF && (unsigned char)raw[1] == 0xFE)
        text = utf16BytesToUtf8(raw.substr(2), true);             // UTF-16LE BOM
    else if (raw.size() >= 2 && (unsigned char)raw[0] == 0xFE && (unsigned char)raw[1] == 0xFF)
        text = utf16BytesToUtf8(raw.substr(2), false);            // UTF-16BE BOM
    else if (forceFormat == -1)
        text = utf16BytesToUtf8(raw, true);                       // explicitly Unicode, no BOM
    else
        text = raw;                                               // UTF-8 / raw
    std::string cur;
    for (char c : text) {
        if (c == '\n') { if (!cur.empty() && cur.back() == '\r') cur.pop_back(); lines.push_back(cur); cur.clear(); }
        else cur += c;
    }
    if (!cur.empty()) { if (cur.back() == '\r') cur.pop_back(); lines.push_back(cur); }
}
// Open a write/append stream with the chosen encoding (writes a UTF-16LE BOM on a
// fresh Unicode file). UTF-16 uses binary mode so 2-byte units aren't mangled.
static std::shared_ptr<TextStreamObject> fsMakeWriteStream(const fs::path& file, bool append, bool utf16) {
    auto ts = std::make_shared<TextStreamObject>();
    auto flags = std::ios::out | (append ? std::ios::app : std::ios::trunc);
    if (utf16) flags |= std::ios::binary;
    ts->out = std::make_shared<std::ofstream>(file, flags);
    if (!*ts->out) raiseErr(76, "Path not found");
    ts->utf16 = utf16;
    if (utf16 && !append) { const char bom[2] = { (char)0xFF, (char)0xFE }; ts->out->write(bom, 2); }
    return ts;
}

// serialFromYMDHMS is defined later (interpreter section); declare it for the date helpers here.
static double serialFromYMDHMS(int y, int mo, int d, int h, int mi, int s);

#ifdef _WIN32
static std::string fsNorm(std::string p) { return p; }
#else
static std::string fsNorm(std::string p) { for (char& c : p) if (c == '\\') c = '/'; return p; }
#endif

// last-write-time -> Directive serial (approximate C++17 file_clock -> system_clock conversion)
static double fsSerial(const fs::path& p) {
    std::error_code ec;
    auto ft = fs::last_write_time(p, ec);
    if (ec) return 0.0;
    auto sctp = std::chrono::time_point_cast<std::chrono::system_clock::duration>(
        ft - fs::file_time_type::clock::now() + std::chrono::system_clock::now());
    std::time_t tt = std::chrono::system_clock::to_time_t(sctp);
    std::tm lt = *std::localtime(&tt);
    return serialFromYMDHMS(lt.tm_year + 1900, lt.tm_mon + 1, lt.tm_mday, lt.tm_hour, lt.tm_min, lt.tm_sec);
}
static long fsAttrBits(const fs::path& p) {   // approximate Directive attribute bits
    std::error_code ec; long a = 0;
    if (fs::is_directory(p, ec)) a |= 16;                 // Directory
    auto st = fs::status(p, ec);
    if (!ec && (st.permissions() & fs::perms::owner_write) == fs::perms::none) a |= 1;  // ReadOnly
    std::string fn = p.filename().string();
    if (!fn.empty() && fn[0] == '.') a |= 2;              // Hidden (Unix dotfile convention)
    return a;
}
static double fsSize(const fs::path& p) {
    std::error_code ec;
    if (fs::is_regular_file(p, ec)) return (double)fs::file_size(p, ec);
    if (fs::is_directory(p, ec)) {
        uintmax_t total = 0;
        for (auto& e : fs::recursive_directory_iterator(p, ec)) {
            std::error_code e2; if (e.is_regular_file(e2)) total += e.file_size(e2);
        }
        return (double)total;
    }
    return 0.0;
}
static Value fsOpenText(const fs::path& file, int mode, int format = 0) {   // 1 read, 2 write, 8 append; format -1=Unicode
    if (mode == 1) {
        auto ts = std::make_shared<TextStreamObject>();
        std::ifstream f(file, std::ios::binary);
        if (!f) raiseErr(53, "File not found");
        fsReadLines(f, format, ts->lines);
        return Value::object(ts);
    }
    return Value::object(fsMakeWriteStream(file, mode == 8, format == -1));
}

static Value makeFileObj(const fs::path& p);
static Value makeFolderObj(const fs::path& p);

// ---- Files / SubFolders collections (enumerable, Count, Item(name)) ----
struct FilesCollection : IObject {
    fs::path dir;
    explicit FilesCollection(fs::path d) : dir(std::move(d)) {}
    std::string typeName() const override { return "Files"; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "count") { long c = 0; std::error_code ec; for (auto& e : fs::directory_iterator(dir, ec)) { std::error_code e2; if (e.is_regular_file(e2)) ++c; } return Value::integer((int32_t)c); }
        if (n.empty() || n == "item") {
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            fs::path p = dir / fsNorm(args[0].toStr()); std::error_code ec;
            if (!fs::is_regular_file(p, ec)) raiseErr(53, "File not found");
            return makeFileObj(p);
        }
        raiseErr(438, "Files: unknown member " + name);
    }
    bool enumerate(Interpreter&, std::vector<Value>& out) override {
        std::error_code ec;
        for (auto& e : fs::directory_iterator(dir, ec)) { std::error_code e2; if (e.is_regular_file(e2)) out.push_back(makeFileObj(e.path())); }
        return true;
    }
};
struct FoldersCollection : IObject {
    fs::path dir;
    explicit FoldersCollection(fs::path d) : dir(std::move(d)) {}
    std::string typeName() const override { return "Folders"; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "count") { long c = 0; std::error_code ec; for (auto& e : fs::directory_iterator(dir, ec)) { std::error_code e2; if (e.is_directory(e2)) ++c; } return Value::integer((int32_t)c); }
        if (n.empty() || n == "item") {
            if (args.empty()) raiseErr(450, "Wrong number of arguments");
            fs::path p = dir / fsNorm(args[0].toStr()); std::error_code ec;
            if (!fs::is_directory(p, ec)) raiseErr(76, "Path not found");
            return makeFolderObj(p);
        }
        raiseErr(438, "Folders: unknown member " + name);
    }
    bool enumerate(Interpreter&, std::vector<Value>& out) override {
        std::error_code ec;
        for (auto& e : fs::directory_iterator(dir, ec)) { std::error_code e2; if (e.is_directory(e2)) out.push_back(makeFolderObj(e.path())); }
        return true;
    }
};

// ---- File object ----
struct FileObject : IObject {
    fs::path p;
    explicit FileObject(fs::path pp) : p(std::move(pp)) {}
    std::string typeName() const override { return "File"; }
    bool tryDefault(Interpreter&, Value& out) override { out = Value::str(p.string()); return true; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "path")                     return Value::str(p.string());
        if (n == "name" || n == "shortname") return Value::str(p.filename().string());
        if (n == "parentfolder")             return makeFolderObj(p.parent_path());
        if (n == "drive")                    return Value::str(p.root_name().string());
        if (n == "size")                     return Value::number(fsSize(p));
        if (n == "type")                     return Value::str("File");
        if (n == "attributes")               return Value::integer((int32_t)fsAttrBits(p));
        if (n == "datecreated" || n == "datelastmodified" || n == "datelastaccessed") return Value::number(fsSerial(p));
        if (n == "delete")                   { std::error_code ec; fs::remove(p, ec); if (ec) raiseErr(70, "Permission denied"); return Value::empty(); }
        if (n == "copy")                     { if (args.empty()) raiseErr(450, "Wrong number of arguments"); std::error_code ec; auto opt = (args.size() > 1 && !args[1].toBool()) ? fs::copy_options::none : fs::copy_options::overwrite_existing; fs::copy_file(p, fs::path(fsNorm(args[0].toStr())), opt, ec); if (ec) raiseErr(53, "Copy failed"); return Value::empty(); }
        if (n == "move")                     { if (args.empty()) raiseErr(450, "Wrong number of arguments"); fs::path d = fsNorm(args[0].toStr()); std::error_code ec; fs::rename(p, d, ec); if (ec) raiseErr(53, "Move failed"); p = d; return Value::empty(); }
        if (n == "openastextstream")         { int mode = args.empty() ? 1 : (int)args[0].toI64(); int fmt = args.size() > 1 ? (int)args[1].toI64() : 0; return fsOpenText(p, mode, fmt); }
        raiseErr(438, "File: unknown member " + name);
    }
};

// ---- Folder object ----
struct FolderObject : IObject {
    fs::path p;
    explicit FolderObject(fs::path pp) : p(std::move(pp)) {}
    std::string typeName() const override { return "Folder"; }
    bool tryDefault(Interpreter&, Value& out) override { out = Value::str(p.string()); return true; }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        if (n == "path")                     return Value::str(p.string());
        if (n == "name" || n == "shortname") { std::string f = p.filename().string(); return Value::str(f.empty() ? p.string() : f); }
        if (n == "parentfolder")             return makeFolderObj(p.parent_path());
        if (n == "drive")                    return Value::str(p.root_name().string());
        if (n == "size")                     return Value::number(fsSize(p));
        if (n == "type")                     return Value::str("File Folder");
        if (n == "attributes")               return Value::integer((int32_t)fsAttrBits(p));
        if (n == "datecreated" || n == "datelastmodified" || n == "datelastaccessed") return Value::number(fsSerial(p));
        if (n == "isrootfolder")             return Value::boolean(p == p.root_path());
        if (n == "files")                    return Value::object(std::make_shared<FilesCollection>(p));
        if (n == "subfolders")               return Value::object(std::make_shared<FoldersCollection>(p));
        if (n == "delete")                   { std::error_code ec; fs::remove_all(p, ec); if (ec) raiseErr(70, "Permission denied"); return Value::empty(); }
        if (n == "copy")                     { if (args.empty()) raiseErr(450, "Wrong number of arguments"); std::error_code ec; auto opt = fs::copy_options::recursive | ((args.size() > 1 && !args[1].toBool()) ? fs::copy_options::none : fs::copy_options::overwrite_existing); fs::copy(p, fs::path(fsNorm(args[0].toStr())), opt, ec); if (ec) raiseErr(76, "Copy failed"); return Value::empty(); }
        if (n == "move")                     { if (args.empty()) raiseErr(450, "Wrong number of arguments"); fs::path d = fsNorm(args[0].toStr()); std::error_code ec; fs::rename(p, d, ec); if (ec) raiseErr(76, "Move failed"); p = d; return Value::empty(); }
        if (n == "createtextfile")           { if (args.empty()) raiseErr(450, "Wrong number of arguments"); fs::path f = p / fsNorm(args[0].toStr()); bool uni = args.size() > 2 && args[2].toBool(); return Value::object(fsMakeWriteStream(f, false, uni)); }
        raiseErr(438, "Folder: unknown member " + name);
    }
};

static Value makeFileObj(const fs::path& p)   { return Value::object(std::make_shared<FileObject>(p)); }
static Value makeFolderObj(const fs::path& p) { return Value::object(std::make_shared<FolderObject>(p)); }

struct FileSystemObject : IObject {
    std::string typeName() const override { return "FileSystemObject"; }
    // Directive paths use '\'. On non-Windows, treat it as the separator too.
#ifdef _WIN32
    static std::string norm(std::string p) { return p; }
#else
    static std::string norm(std::string p) { for (char& c : p) if (c == '\\') c = '/'; return p; }
#endif
    // If dst names an existing directory (or ends in a separator), append src's file name.
    static std::string resolveDest(const std::string& src, std::string dst) {
        std::error_code ec;
        bool dir = fs::is_directory(dst, ec) || (!dst.empty() && (dst.back() == '/' || dst.back() == '\\'));
        if (dir) return (fs::path(dst) / fs::path(src).filename()).string();
        return dst;
    }
    static std::string baseName(const std::string& p) {
        size_t s = p.find_last_of("/\\"); std::string f = s == std::string::npos ? p : p.substr(s + 1);
        size_t d = f.find_last_of('.'); return d == std::string::npos ? f : f.substr(0, d);
    }
    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        std::string n = toLower(name);
        auto need = [&](size_t k){ if (args.size() < k) raiseErr(450, "Wrong number of arguments"); };
        if (n == "fileexists")   { need(1); std::error_code ec; return Value::boolean(fs::is_regular_file(norm(args[0].toStr()), ec)); }
        if (n == "folderexists") { need(1); std::error_code ec; return Value::boolean(fs::is_directory(norm(args[0].toStr()), ec)); }
        if (n == "createfolder") {
            need(1); std::string p = norm(args[0].toStr()); std::error_code ec;
            if (fs::exists(p, ec)) raiseErr(58, "File already exists");
            fs::create_directory(p, ec);
            if (ec) raiseErr(76, "Path not found");
            return makeFolderObj(p);
        }
        if (n == "getfolder") {
            need(1); std::string p = norm(args[0].toStr()); std::error_code ec;
            if (!fs::is_directory(p, ec)) raiseErr(76, "Path not found");
            return makeFolderObj(p);
        }
        if (n == "getfile") {
            need(1); std::string p = norm(args[0].toStr()); std::error_code ec;
            if (!fs::is_regular_file(p, ec)) raiseErr(53, "File not found");
            return makeFileObj(p);
        }
        if (n == "getspecialfolder") {
            long k = args.empty() ? 0 : args[0].toI64(); std::error_code ec;
            if (k == 2) return makeFolderObj(fs::temp_directory_path(ec));   // 2 = TemporaryFolder
            return makeFolderObj(fs::current_path(ec));                       // 0/1 best-effort
        }
        if (n == "deletefile") {
            need(1); std::string p = norm(args[0].toStr()); std::error_code ec;
            if (!fs::exists(p, ec)) raiseErr(53, "File not found");
            fs::remove(p, ec);
            if (ec) raiseErr(70, "Permission denied");
            return Value::empty();
        }
        if (n == "deletefolder") {
            need(1); std::string p = norm(args[0].toStr()); std::error_code ec;
            if (!fs::exists(p, ec)) raiseErr(76, "Path not found");
            fs::remove_all(p, ec);
            if (ec) raiseErr(70, "Permission denied");
            return Value::empty();
        }
        if (n == "copyfile") {
            need(2); std::error_code ec;
            std::string src = norm(args[0].toStr()), dst = resolveDest(src, norm(args[1].toStr()));
            auto opt = (args.size() > 2 && !args[2].toBool()) ? fs::copy_options::none
                                                              : fs::copy_options::overwrite_existing;
            fs::copy_file(src, dst, opt, ec);
            if (ec) raiseErr(53, "File not found or copy failed");
            return Value::empty();
        }
        if (n == "copyfolder") {
            need(2); std::error_code ec;
            auto opt = fs::copy_options::recursive |
                       ((args.size() > 2 && !args[2].toBool()) ? fs::copy_options::none
                                                               : fs::copy_options::overwrite_existing);
            fs::copy(norm(args[0].toStr()), norm(args[1].toStr()), opt, ec);
            if (ec) raiseErr(76, "Path not found or copy failed");
            return Value::empty();
        }
        if (n == "movefile" || n == "movefolder") {
            need(2); std::error_code ec;
            std::string src = norm(args[0].toStr()), dst = resolveDest(src, norm(args[1].toStr()));
            fs::rename(src, dst, ec);
            if (ec) raiseErr(53, "Move failed (source not found or cross-device)");
            return Value::empty();
        }
        if (n == "getabsolutepathname") {
            need(1); std::error_code ec; auto p = fs::absolute(norm(args[0].toStr()), ec);
            return Value::str(ec ? norm(args[0].toStr()) : p.string());
        }
        if (n == "gettempname") {
            static unsigned seed = (unsigned)std::time(nullptr);
            seed = seed * 1103515245u + 12345u;
            char buf[32]; std::snprintf(buf, sizeof(buf), "dir%05u.tmp", (seed >> 8) % 100000u);
            return Value::str(buf);
        }
        if (n == "createtextfile") {
            need(1);
            bool uni = args.size() > 2 && args[2].toBool();   // (name, [overwrite], [unicode])
            return Value::object(fsMakeWriteStream(norm(args[0].toStr()), false, uni));
        }
        if (n == "opentextfile") {
            need(1);
            int mode = args.size() > 1 ? (int)args[1].toI64() : 1;   // 1 read, 2 write, 8 append
            int fmt  = args.size() > 3 ? (int)args[3].toI64() : 0;   // (name, mode, [create], [format]) -1=Unicode
            if (mode == 1) {
                auto ts = std::make_shared<TextStreamObject>();
                std::ifstream f(norm(args[0].toStr()), std::ios::binary);
                if (!f) raiseErr(53, "File not found");
                fsReadLines(f, fmt, ts->lines);
                return Value::object(ts);
            }
            return Value::object(fsMakeWriteStream(norm(args[0].toStr()), mode == 8, fmt == -1));
        }
        if (n == "getbasename")      { need(1); return Value::str(baseName(norm(args[0].toStr()))); }
        if (n == "getfilename")      { need(1); std::string p = norm(args[0].toStr()); size_t s = p.find_last_of("/\\"); return Value::str(s == std::string::npos ? p : p.substr(s + 1)); }
        if (n == "getextensionname") { need(1); std::string p = norm(args[0].toStr()); size_t d = p.find_last_of('.'); return Value::str(d == std::string::npos ? "" : p.substr(d + 1)); }
        if (n == "getparentfoldername"){ need(1); std::string p = norm(args[0].toStr()); size_t s = p.find_last_of("/\\"); return Value::str(s == std::string::npos ? "" : p.substr(0, s)); }
        if (n == "buildpath")        { need(2); std::string a = norm(args[0].toStr()), b = norm(args[1].toStr()); if (!a.empty() && a.back() != '/' && a.back() != '\\') a += "/"; return Value::str(a + b); }
        raiseErr(438, "FileSystemObject: unknown member " + name);
    }
};

// ================================================================ INTERPRETER
#include <cstdlib>

// Date <-> Directive serial (days since 1899-12-30). Hinnant's civil algorithms.
static long daysFromCivil(int y, unsigned m, unsigned d) {
    y -= m <= 2;
    long era = (y >= 0 ? y : y - 399) / 400;
    unsigned yoe = (unsigned)(y - era * 400);
    unsigned doy = (153 * (m + (m > 2 ? -3 : 9)) + 2) / 5 + d - 1;
    unsigned doe = yoe * 365 + yoe / 4 - yoe / 100 + doy;
    return era * 146097L + (long)doe - 719468L;
}
static void civilFromDays(long z, int& y, unsigned& m, unsigned& d) {
    z += 719468;
    long era = (z >= 0 ? z : z - 146096) / 146097;
    unsigned doe = (unsigned)(z - era * 146097);
    unsigned yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365;
    y = (int)(yoe) + (int)(era * 400);
    unsigned doy = doe - (365 * yoe + yoe / 4 - yoe / 100);
    unsigned mp = (5 * doy + 2) / 153;
    d = doy - (153 * mp + 2) / 5 + 1;
    m = mp + (mp < 10 ? 3 : -9);
    y += (m <= 2);
}
static const long kBaseDay = daysFromCivil(1899, 12, 30);
static double serialFromYMDHMS(int y, int mo, int d, int h, int mi, int s) {
    long dd = daysFromCivil(y, (unsigned)mo, (unsigned)d) - kBaseDay;
    return (double)dd + (h * 3600 + mi * 60 + s) / 86400.0;
}
static void ymdhmsFromSerial(double serial, int& y, int& mo, int& d, int& h, int& mi, int& s) {
    long dd = (long)std::floor(serial);
    double frac = serial - (double)dd;
    unsigned um, ud; int yy; civilFromDays(dd + kBaseDay, yy, um, ud);
    y = yy; mo = (int)um; d = (int)ud;
    long secs = (long)std::llround(frac * 86400.0);
    h = (int)(secs / 3600); mi = (int)((secs % 3600) / 60); s = (int)(secs % 60);
}

// COM factory (defined in the Windows section; returns ok=false off-Windows).
static ObjectPtr createComObject(const std::string& progid, bool& ok);
// Windows-only automation objects (real impl in the platform section; stubs raise on other OSes):
static ObjectPtr makeMouseObj();
static ObjectPtr makeScreenObj();
static ObjectPtr makeKeyboardObj();
static ObjectPtr makeClipboardObj();
// Sound playback (Beep/Play/Stop); Windows-only, stubs raise elsewhere. (WAV
// combining lives in SoundObject itself and is cross-platform.)
static bool soundPlay(const std::string& file, bool wait);
static void soundStop();
static void soundBeep(int freq, int dur);
// Clipboard text access used by the Clipboard object; Windows-only, stubs raise elsewhere.
static bool clipboardSet(const std::string& text);
static bool clipboardGet(std::string& out);
static void clipboardClear();

// Cross-platform process helpers used by the Shell object (Run waits or detaches;
// Exec captures stdout). Registry/special-folder helpers are platform-specific.
static int shellRun(const std::string& cmd, bool wait) {
#ifdef _WIN32
    if (wait) return system(cmd.c_str());
    int rc = system(("start \"\" " + cmd).c_str()); (void)rc;
    return 0;
#else
    if (wait) { int rc = system(cmd.c_str()); return (rc >= 0 && WIFEXITED(rc)) ? WEXITSTATUS(rc) : rc; }
    int rc = system((cmd + " &").c_str()); (void)rc;
    return 0;
#endif
}
static bool shellExec(const std::string& cmd, std::string& out, int& exitCode) {
#ifdef _WIN32
    FILE* p = _popen(cmd.c_str(), "r");
#else
    FILE* p = popen(cmd.c_str(), "r");
#endif
    if (!p) return false;
    char buf[4096]; size_t n;
    while ((n = fread(buf, 1, sizeof(buf), p)) > 0) out.append(buf, n);
#ifdef _WIN32
    exitCode = _pclose(p);
#else
    int st = pclose(p); exitCode = (st >= 0 && WIFEXITED(st)) ? WEXITSTATUS(st) : st;
#endif
    return true;
}

// ---- WAV combiner: concatenates same-format PCM WAV files into one output ----
// Pure file I/O, so this works on every platform (no audio device needed).
struct WavFmt { uint16_t channels = 0; uint32_t rate = 0; uint16_t bits = 0; };

static bool readWavFile(const std::string& path, WavFmt& fmt, std::string& data) {
    std::ifstream f(path, std::ios::binary);
    if (!f) return false;
    char id[4]; uint32_t sz = 0;
    if (!f.read(id, 4) || std::string(id, 4) != "RIFF") return false;
    f.read(reinterpret_cast<char*>(&sz), 4);
    if (!f.read(id, 4) || std::string(id, 4) != "WAVE") return false;
    bool gotFmt = false, gotData = false;
    while (f.read(id, 4) && f.read(reinterpret_cast<char*>(&sz), 4)) {
        std::string chunk(id, 4);
        if (chunk == "fmt ") {
            uint16_t audio = 0, ch = 0, ba = 0, bits = 0; uint32_t rate = 0, br = 0;
            f.read(reinterpret_cast<char*>(&audio), 2);
            f.read(reinterpret_cast<char*>(&ch), 2);
            f.read(reinterpret_cast<char*>(&rate), 4);
            f.read(reinterpret_cast<char*>(&br), 4);
            f.read(reinterpret_cast<char*>(&ba), 2);
            f.read(reinterpret_cast<char*>(&bits), 2);
            fmt.channels = ch; fmt.rate = rate; fmt.bits = bits;
            gotFmt = true;
            if (audio != 1) return false;              // only uncompressed PCM
            if (sz > 16) f.seekg(sz - 16, std::ios::cur);
        } else if (chunk == "data") {
            data.resize(sz);
            if (sz) f.read(&data[0], sz);
            gotData = true;
            break;
        } else {
            f.seekg(sz + (sz & 1), std::ios::cur);     // skip unknown chunk (+ pad byte)
        }
    }
    return gotFmt && gotData;
}

// Sound: WAV combining (Create/Append/Duration/Close) is pure file I/O and works
// everywhere; Play/Stop/Beep are Windows-only and delegate to helpers that raise
// on other platforms. (Absorbs the former WavFile object.)
struct SoundObject : IObject {
    std::ofstream out;
    WavFmt fmt;
    uint32_t dataBytes = 0;
    bool haveFmt = false, isOpen = false;
    std::string path;

    ~SoundObject() override { if (isOpen) finalize(); }

    void writeHeader() {
        uint32_t byteRate   = fmt.rate * fmt.channels * (fmt.bits / 8);
        uint16_t blockAlign = (uint16_t)(fmt.channels * (fmt.bits / 8));
        uint32_t chunkSize  = 36 + dataBytes;
        uint16_t audio = 1;  uint32_t sc1 = 16;
        out.seekp(0);
        out.write("RIFF", 4); out.write(reinterpret_cast<char*>(&chunkSize), 4); out.write("WAVE", 4);
        out.write("fmt ", 4); out.write(reinterpret_cast<char*>(&sc1), 4);
        out.write(reinterpret_cast<char*>(&audio), 2);
        out.write(reinterpret_cast<char*>(&fmt.channels), 2);
        out.write(reinterpret_cast<char*>(&fmt.rate), 4);
        out.write(reinterpret_cast<char*>(&byteRate), 4);
        out.write(reinterpret_cast<char*>(&blockAlign), 2);
        out.write(reinterpret_cast<char*>(&fmt.bits), 2);
        out.write("data", 4); out.write(reinterpret_cast<char*>(&dataBytes), 4);
    }
    void finalize() {
        if (!haveFmt) { fmt.channels = 2; fmt.rate = 44100; fmt.bits = 16; }
        writeHeader();
        out.close();
        isOpen = false;
    }

    std::string typeName() const override { return "Sound"; }
    Value get(Interpreter&, const std::string& member, std::vector<Value>& args) override {
        std::string m = toLower(member);
        // ---- WAV combining (cross-platform) ----
        if (m == "create") {
            if (args.empty()) raiseErr(5, "Sound.Create requires a path");
            path = args[0].toStr();
            out.open(path, std::ios::binary | std::ios::trunc);
            if (!out) raiseErr(76, "Sound.Create: cannot open '" + path + "'");
            char zero[44] = {0};
            out.write(zero, 44);                       // placeholder, patched on Close
            dataBytes = 0; haveFmt = false; isOpen = true;
            return Value::empty();
        }
        if (m == "append" || m == "add") {
            if (!isOpen) raiseErr(5, "Sound: call Create before Append");
            if (args.empty()) raiseErr(5, "Sound.Append requires a path");
            WavFmt f; std::string data;
            if (!readWavFile(args[0].toStr(), f, data))
                raiseErr(76, "Sound.Append: cannot read PCM WAV '" + args[0].toStr() + "'");
            if (!haveFmt) { fmt = f; haveFmt = true; }
            else if (f.channels != fmt.channels || f.rate != fmt.rate || f.bits != fmt.bits)
                raiseErr(5, "Sound.Append: format mismatch (all files must share channels/sample-rate/bit-depth)");
            if (!data.empty()) out.write(data.data(), (std::streamsize)data.size());
            dataBytes += (uint32_t)data.size();
            return Value::empty();
        }
        if (m == "close") { if (isOpen) finalize(); return Value::empty(); }
        if (m == "duration") {                          // seconds written so far
            double bps = haveFmt ? (double)fmt.rate * fmt.channels * (fmt.bits / 8) : 0.0;
            return Value::number(bps > 0 ? dataBytes / bps : 0.0);
        }
        // ---- Playback (Windows-only; raises 429 elsewhere) ----
        if (m == "play") {
            if (args.empty()) raiseErr(5, "Sound.Play requires a file path");
            bool wait = args.size() > 1 && args[1].toBool();
            return Value::boolean(soundPlay(args[0].toStr(), wait));
        }
        if (m == "stop") { soundStop(); return Value::empty(); }
        if (m == "beep") {
            soundBeep(args.size() > 0 ? (int)args[0].toInt() : 800,
                      args.size() > 1 ? (int)args[1].toInt() : 200);
            return Value::empty();
        }
        raiseErr(438, "Sound has no member '" + member + "'");
        return Value::empty();
    }
};

// ---- parsed class shape ----
struct ClassInfo {
    std::string name;
    std::vector<std::string> fields;                       // field names (original case)
    std::unordered_map<std::string, StmtP> methods;        // lower -> Sub/Function
    std::unordered_map<std::string, StmtP> propGet, propLet, propSet;
    std::string defaultMember;                             // lower name of the Default member ("" if none)
};

// ---- an instance of a script-defined class ----
struct ClassInstance : IObject {
    std::shared_ptr<ClassInfo> cls;
    std::unordered_map<std::string, Value> fields;         // lower -> value
    Interpreter* interp = nullptr;                         // set at creation; used to run Class_Terminate
    ~ClassInstance();                                      // runs Class_Terminate (defined after Interpreter)
    std::string typeName() const override { return cls ? cls->name : "Object"; }
    Value get(Interpreter& in, const std::string& name, std::vector<Value>& args) override;
    void set(Interpreter& in, const std::string& name, std::vector<Value>& args,
             const Value& val, bool isSet) override;
    bool tryDefault(Interpreter& in, Value& out) override;   // fires the Default member (defined below)
};

// ---- TextWindow --------------------------------------------------------------
// A window with a scrollable output pane on top and an editable input pane below,
// modelled on the Scripting.TextWindow component. It runs on its own thread with
// its own message loop, so it stays responsive while the script is busy and output
// appears as it is written. Unicode throughout, which the console cannot manage.
struct TwOpts {
    std::string title = "Directive", fontName = "Consolas";
    int  width = 720, height = 460, fontSize = 10;
    bool wordWrap = true, showInput = true, echoInput = true;
    bool submitOnEnter = false, visible = true;
};
static void* twOpen(const TwOpts&);
static void  twWrite(void*, const std::string&);
static std::string twGetText(void*);
static void  twSetText(void*, const std::string&);
static void  twClear(void*);
static std::string twGetInput(void*);
static void  twSetInput(void*, const std::string&);
static void  twClearInput(void*);
static bool  twHasInput(void*);
static bool  twReadLine(void*, std::string&);
static bool  twReadAll(void*, std::string&);
static void  twShow(void*, int);
static void  twActivate(void*);
static void  twClose(void*);
static bool  twIsClosed(void*);
static bool  twIsVisible(void*);
static void  twWaitForClose(void*);
static void  twSetTitle(void*, const std::string&);
static void  twSetSize(void*, int, int);
static void  twSetFont(void*, const std::string&, int);
static void  twSetWrap(void*, bool);
static void  twSetShowInput(void*, bool);
static void  twSetEcho(void*, bool);
static void  twSetSubmitEnter(void*, bool);
static bool  twGetFlag(void*, int);
static void  twDestroy(void*);

// ---- Console control backend -------------------------------------------------
// Colour numbers follow cmd.exe's `color` command and the Win32 console attribute
// bits (1=blue, 2=green, 4=red, +8=bright), NOT the ANSI order -- so dsBlue is 1
// and dsRed is 4. On POSIX the values are translated to ANSI SGR codes. On
// Windows the Win32 console API is used directly rather than VT escapes: it works
// on every Windows version and is still honoured under Windows Terminal (conhost
// translates it), so nothing here depends on cmd.exe surviving.
// Coordinates are 0-based, matching Directive.Arguments and List.
static int g_conFg = -1;          // -1 = the console's own default
static bool g_conCursorShown = true;
static int g_conBg = -1;
static bool conAttached();                    // is a console/terminal present?
static bool conOwnsWindow();                  // console dies when this process exits
static bool conCanReadKeys();                 // stdin is a real console/terminal
static void conApplyColors();                 // push g_conFg/g_conBg to the console
static void conResetColors();
static void conCls();
static void conClearLine();
static void conMoveTo(int x, int y);
static bool conGetCursor(int& x, int& y);
static void conGetSize(int& cols, int& rows);
static void conShowCursor(bool visible);
static void conSetTitle(const std::string& t);
static std::string conGetTitle();
static std::string conReadKey();              // blocks for one key; "" if none

// Shared key-name table: ReadKey returns exactly the names Keyboard.Send accepts,
// so a key can be read and replayed ({UP}, {ENTER}, ^a for Ctrl+A, ...).
static std::string conCtrlName(unsigned char c) {
    return std::string("^") + (char)('a' + (c - 1));
}
static std::string conFnName(int n) {
    return "{F" + std::to_string(n) + "}";
}

struct TextWindowObject : IObject {
    void*   h = nullptr;          // the live window, created on first use
    TwOpts  o;                    // settings, applied when it is created
    ~TextWindowObject() override { if (h) twDestroy(h); }
    std::string typeName() const override { return "TextWindow"; }

    // The window appears on the first write, as the reference component does.
    void* need() {
        if (!h) { h = twOpen(o); if (!h) raiseErr(429, "TextWindow could not be created"); }
        return h;
    }
    static std::string joinArgs(std::vector<Value>& a) {
        std::string t;
        for (size_t i = 0; i < a.size(); ++i) t += a[i].toConcatStr();
        return t;
    }

    Value get(Interpreter&, const std::string& member, std::vector<Value>& args) override {
        std::string m = toLower(member);
        if (m.empty() || m == "text") {                       // Text is the default member
            if (!args.empty()) { twWrite(need(), joinArgs(args)); return Value::empty(); }
            return Value::str(h ? twGetText(h) : std::string());
        }
        if (m == "write")     { twWrite(need(), joinArgs(args)); return Value::empty(); }
        if (m == "writeline") { twWrite(need(), joinArgs(args) + "\r\n"); return Value::empty(); }
        if (m == "clear")     { if (h) twClear(h); return Value::empty(); }
        if (m == "readline" || m == "readall") {
            std::string out;
            bool ok = (m == "readline") ? twReadLine(need(), out) : twReadAll(need(), out);
            if (!ok) raiseErr(500, "The TextWindow was closed while waiting for input");
            return Value::str(out);
        }
        if (m == "prompt") {
            twWrite(need(), joinArgs(args));
            std::string out;
            if (!twReadLine(h, out)) raiseErr(500, "The TextWindow was closed while waiting for input");
            return Value::str(out);
        }
        if (m == "inputtext")   return Value::str(h ? twGetInput(h) : std::string());
        if (m == "clearinput")  { if (h) twClearInput(h); return Value::empty(); }
        if (m == "hasinput")    return Value::boolean(h && twHasInput(h));
        if (m == "show")        { twShow(need(), 5); o.visible = true;  return Value::empty(); }
        if (m == "hide")        { if (h) twShow(h, 0); o.visible = false; return Value::empty(); }
        if (m == "close")       { if (h) twClose(h); return Value::empty(); }
        if (m == "activate")    { twActivate(need()); return Value::empty(); }
        if (m == "waitforclose"){ if (h) twWaitForClose(h); return Value::empty(); }
        if (m == "visible")     return Value::boolean(h ? twIsVisible(h) : o.visible);
        if (m == "isclosed")    return Value::boolean(h && twIsClosed(h));
        if (m == "title")       return Value::str(o.title);
        if (m == "width")       return Value::integer((int32_t)o.width);
        if (m == "height")      return Value::integer((int32_t)o.height);
        if (m == "fontname")    return Value::str(o.fontName);
        if (m == "fontsize")    return Value::integer((int32_t)o.fontSize);
        if (m == "wordwrap")    return Value::boolean(h ? twGetFlag(h, 0) : o.wordWrap);
        if (m == "showinput")   return Value::boolean(h ? twGetFlag(h, 1) : o.showInput);
        if (m == "echoinput")   return Value::boolean(h ? twGetFlag(h, 2) : o.echoInput);
        if (m == "submitonenter") return Value::boolean(h ? twGetFlag(h, 3) : o.submitOnEnter);
        raiseErr(438, "TextWindow has no member '" + member + "'");
        return Value::empty();
    }

    void set(Interpreter&, const std::string& member, std::vector<Value>& args,
             const Value& val, bool isSet) override {
        (void)args; (void)isSet;
        std::string m = toLower(member);
        if (m == "text")      { twSetText(need(), val.toConcatStr()); return; }
        if (m == "inputtext") { twSetInput(need(), val.toConcatStr()); return; }
        if (m == "title")     { o.title = val.toConcatStr(); if (h) twSetTitle(h, o.title); return; }
        if (m == "width")     { o.width  = (int)val.toI64(); if (h) twSetSize(h, o.width, o.height); return; }
        if (m == "height")    { o.height = (int)val.toI64(); if (h) twSetSize(h, o.width, o.height); return; }
        if (m == "fontname")  { o.fontName = val.toConcatStr(); if (h) twSetFont(h, o.fontName, o.fontSize); return; }
        if (m == "fontsize")  { o.fontSize = (int)val.toI64(); if (h) twSetFont(h, o.fontName, o.fontSize); return; }
        if (m == "wordwrap")  { o.wordWrap = val.toBool(); if (h) twSetWrap(h, o.wordWrap); return; }
        if (m == "showinput") { o.showInput = val.toBool(); if (h) twSetShowInput(h, o.showInput); return; }
        if (m == "echoinput") { o.echoInput = val.toBool(); if (h) twSetEcho(h, o.echoInput); return; }
        if (m == "submitonenter") { o.submitOnEnter = val.toBool(); if (h) twSetSubmitEnter(h, o.submitOnEnter); return; }
        if (m == "visible")   { o.visible = val.toBool(); if (h) twShow(h, o.visible ? 5 : 0); return; }
        raiseErr(438, "TextWindow has no writable property '" + member + "'");
    }
};

// ---- Console object (cross-platform) ----------------------------------------
// A deliberate extension: VBScript has no console-control API at all, which is
// exactly why batch scripts shell out to `color` and `cls`.
struct ConsoleObject : IObject {
    std::string typeName() const override { return "Console"; }

    // Optional colour argument: Empty/missing means "leave as is".
    static int colorArg(std::vector<Value>& a, size_t i) {
        if (a.size() <= i || a[i].isEmpty()) return -2;      // -2 = not supplied
        long v = a[i].toI64();
        if (v < -1 || v > 15) raiseErr(5, "Console: colour must be 0-15");
        return (int)v;
    }
    static int checkColor(const Value& v) {
        if (v.isEmpty()) return -1;
        long n = v.toI64();
        if (n < -1 || n > 15) raiseErr(5, "Console: colour must be 0-15");
        return (int)n;
    }
    // Write with an optional one-shot colour that is restored afterwards, so a
    // single word or line can be coloured without disturbing the current state.
    static void writeSpan(const std::string& s, int fg, int bg, bool nl) {
        bool temp = (fg != -2 || bg != -2);
        int savedFg = g_conFg, savedBg = g_conBg;
        if (temp) {
            if (fg != -2) g_conFg = fg;
            if (bg != -2) g_conBg = bg;
            conApplyColors();
        }
        std::cout << s;
        if (nl) std::cout << "\n";
        std::cout.flush();
        if (temp) { g_conFg = savedFg; g_conBg = savedBg; conApplyColors(); }
    }
    static std::string pausePrompt(std::vector<Value>& a) {
        if (!a.empty() && !a[0].isEmpty()) return a[0].toConcatStr();
        return "Press any key to continue . . . ";
    }
    // Wait for a keypress. Skips silently when there is no interactive console,
    // so a piped or redirected run can never hang.
    static void waitKey(std::vector<Value>& a) {
        if (!conCanReadKeys()) return;
        std::cout << pausePrompt(a);
        std::cout.flush();
        std::string k = conReadKey();
        std::cout << "\n";
        std::cout.flush();
        (void)k;
    }

    Value get(Interpreter&, const std::string& member, std::vector<Value>& args) override {
        std::string m = toLower(member);
        // ---- colour ----
        if (m == "foreground")   return Value::integer(g_conFg);
        if (m == "background")   return Value::integer(g_conBg);
        if (m == "reset")        { conResetColors(); return Value::empty(); }
        if (m == "write" || m == "writeline") {
            std::string s = args.empty() ? "" : args[0].toConcatStr();
            writeSpan(s, colorArg(args, 1), colorArg(args, 2), m == "writeline");
            return Value::empty();
        }
        // ---- screen ----
        if (m == "cls")          { conCls(); return Value::empty(); }
        if (m == "clearline")    { conClearLine(); return Value::empty(); }
        if (m == "width")        { int c = 0, r = 0; conGetSize(c, r); return Value::integer(c); }
        if (m == "height")       { int c = 0, r = 0; conGetSize(c, r); return Value::integer(r); }
        // ---- cursor ----
        if (m == "moveto") {
            if (args.size() < 2) raiseErr(450, "Console.MoveTo requires x and y");
            conMoveTo((int)args[0].toI64(), (int)args[1].toI64());
            return Value::empty();
        }
        if (m == "cursorx" || m == "cursory") {
            int x = 0, y = 0;
            if (!conGetCursor(x, y)) return Value::integer(-1);
            return Value::integer(m == "cursorx" ? x : y);
        }
        if (m == "cursorvisible") return Value::boolean(g_conCursorShown);
        // ---- window ----
        if (m == "title")        return Value::str(conGetTitle());
        if (m == "attached")     return Value::boolean(conAttached());
        // ---- input ----
        if (m == "readkey")      { if (!conCanReadKeys()) return Value::str(""); return Value::str(conReadKey()); }
        if (m == "pause")        { waitKey(args); return Value::empty(); }
        if (m == "keepopen")     { if (conOwnsWindow() && conCanReadKeys()) waitKey(args); return Value::empty(); }
        raiseErr(438, "Console has no member '" + member + "'");
        return Value::empty();
    }

    void set(Interpreter&, const std::string& member, std::vector<Value>& args,
             const Value& val, bool isSet) override {
        (void)args; (void)isSet;
        std::string m = toLower(member);
        if (m == "foreground")    { g_conFg = checkColor(val); conApplyColors(); return; }
        if (m == "background")    { g_conBg = checkColor(val); conApplyColors(); return; }
        if (m == "cursorvisible") { g_conCursorShown = val.toBool(); conShowCursor(g_conCursorShown); return; }
        if (m == "title")         { conSetTitle(val.toConcatStr()); return; }
        if (m == "cursorx" || m == "cursory") {
            int x = 0, y = 0; conGetCursor(x, y);
            if (m == "cursorx") x = (int)val.toI64(); else y = (int)val.toI64();
            conMoveTo(x, y);
            return;
        }
        raiseErr(438, "Console has no writable property '" + member + "'");
    }
};

class Interpreter {
public:
    Interpreter() { frames.reserve(64); framePool.reserve(64); setupConstants(); setupObjects(); registerBuiltins(); }
    ~Interpreter() { shuttingDown = true; }   // stop terminators once members start being destroyed

    // Run a class instance's Class_Terminate (if any). Called from ClassInstance's
    // destructor, so it must never throw and must be inert during shutdown.
    void runTerminator(ClassInstance* self) {
        if (shuttingDown || !self || !self->cls) return;
        auto it = self->cls->methods.find("class_terminate");
        if (it == self->cls->methods.end()) return;
        try { std::vector<Value> none; invoke(it->second, none, self, nullptr); }
        catch (...) { /* a terminator must not escape a destructor */ }
    }

    void run(std::vector<StmtP>& program) {
        for (auto& s : program) {          // pass 1: hoist procs + classes
            if (s->k == Stmt::SubDecl || s->k == Stmt::FuncDecl) procs[toLower(s->name)] = s;
            else if (s->k == Stmt::ClassDecl) registerClass(s);
        }
        execBlock(program);                // pass 2: execute top-level in order
        globals.clear();                   // drop module-level objects now (interpreter still alive) so
                                           // their Class_Terminate runs before teardown
    }

    // Execute / ExecuteGlobal. Parses and runs a code string.
    //   global == false : runs in the current scope (Execute)
    //   global == true  : runs at module/global scope (ExecuteGlobal), even when
    //                     called from inside a Sub/Function or class method.
    void executeString(const std::string& src, bool global) {
        Lexer lx(src);
        Parser p(lx.tokenize());
        std::vector<StmtP> prog = p.parseProgram();
        for (auto& s : prog) {             // hoist any procs/classes it defines
            if (s->k == Stmt::SubDecl || s->k == Stmt::FuncDecl) procs[toLower(s->name)] = s;
            else if (s->k == Stmt::ClassDecl) registerClass(s);
        }
        if (global && (!frames.empty() || !instanceStack.empty())) {
            auto savedFrames = std::move(frames);
            auto savedInstances = std::move(instanceStack);
            frames.clear(); instanceStack.clear();
            try { execBlock(prog); }
            catch (...) { frames = std::move(savedFrames); instanceStack = std::move(savedInstances); throw; }
            frames = std::move(savedFrames); instanceStack = std::move(savedInstances);
        } else {
            execBlock(prog);
        }
    }

    // Eval("expr") — parse and evaluate a single expression in the current scope.
    Value evalExpression(const std::string& src) {
        Lexer lx(src);
        Parser p(lx.tokenize());
        ExprP e = p.parseOneExpr();
        return eval(e.get());
    }
    // Call a Sub/Function/builtin by (lowercased) name — used by function references.
    Value callByName(const std::string& low, std::vector<Value>& args) {
        auto it = procs.find(low);
        if (it != procs.end()) return invoke(it->second, args, nullptr, nullptr);
        auto b = builtins.find(low);
        if (b != builtins.end()) return b->second(*this, args);
        raiseErr(438, "Unknown procedure or function: " + low);
    }
    Value makeFuncRef(const std::string& name);   // defined after FuncRefObject

    // Public hooks used by ClassInstance:
    int errorLine() const { return curLine; }
    int errorCol()  const { return curCol; }
    // Record the running script's path so Include resolution and Directive.Script* work.
    void setScriptInfo(const std::string& fullPath, const std::string& dir) {
        if (!directiveObj) return;
        directiveObj->scriptFullName = fullPath;
        directiveObj->scriptDir = dir;
        if (!fullPath.empty()) directiveObj->scriptName = fs::path(fullPath).filename().string();
    }
    void setArguments(const std::vector<std::string>& a) { if (directiveObj) directiveObj->scriptArgs = a; }
    Value callClassMethod(ClassInstance* self, StmtP decl, std::vector<Value>& argv) {
        return invoke(decl, argv, self, nullptr);
    }
    Value arrayGetPub(Value& av, std::vector<Value>& args) { return arrayGet(av, args); }
    void arraySetPub(Value& av, std::vector<Value>& args, const Value& v) { arraySet(av, args, v); }

private:
    std::unordered_map<std::string, Value> globals;
    std::vector<std::unordered_map<std::string, Value>> frames;
    std::vector<std::unordered_map<std::string, Value>> framePool;   // recycled frames (keep bucket allocations)
    std::unordered_map<std::string, StmtP> procs;
    std::unordered_map<std::string, std::shared_ptr<ClassInfo>> classes;
    std::unordered_map<std::string, std::function<Value(Interpreter&, std::vector<Value>&)>> builtins;
    std::shared_ptr<ErrObject> errObj;
    std::shared_ptr<DirectiveObject> directiveObj;   // host object; also carries script path info
    std::vector<ClassInstance*> instanceStack;
    std::vector<Value> withStack;
    // COM objects produced as intermediates during a statement are held here until
    // the statement finishes, so a parent isn't freed while a child derived from it
    // is still in use (matches how VBScript keeps expression intermediates alive).
    std::vector<Value> comAnchors;
    void anchorCom(const Value& v) { if (v.isObject() && v.obj && v.obj->isComRef()) comAnchors.push_back(v); }
    bool onErrorResumeNext = false;
    bool optionExplicit = false;
    bool shuttingDown = false;        // set during teardown so Class_Terminate never runs against half-freed state
    int curLine = 0;                  // line of the statement currently executing (for error messages)
    int curCol = 0;                   // its starting column

    // ---------------------------------------------------------- helpers
    static bool truth(const Value& v) { return v.isNull() ? false : v.toBool(); }
    static Value cloneIfArray(const Value& v) {
        if (!v.isArray()) return v;
        auto nd = std::make_shared<ArrayData>(*v.arr);
        return Value::array(nd);
    }
    // Integer -> Long -> LongLong, the narrowest subtype that holds r exactly.
    // VBScript's ladder stops at Long and jumps to Double; Directive adds the
    // LongLong rung so large whole numbers never lose digits.
    static Value intLadder(long long r, bool bothNarrow) {
        if (bothNarrow && r >= -32768 && r <= 32767) return Value::int16((int16_t)r);
        if (r >= INT32_MIN && r <= INT32_MAX)        return Value::integer((int32_t)r);
        return Value::big(r);
    }
    static Value fitInt(long long r) { return intLadder(r, false); }
    // An operand holding an exact integer, so arithmetic can stay in integers.
    static bool exactInt(const Value& v) {
        return v.type == Value::Type::Int || v.type == Value::Type::Int64 ||
               v.type == Value::Type::Bool || v.isEmpty();
    }
    // Exact + - * when both sides are integers. Sets handled=false on overflow or
    // a non-integer operand so the caller falls back to Double, which is the same
    // promotion VBScript performs once a Long can no longer hold the result.
    static Value exactArith(char op, const Value& a, const Value& b, bool& handled) {
        handled = false;
        if (!exactInt(a) || !exactInt(b)) return Value::empty();
        long long x = a.toI64(), y = b.toI64(), r = 0;
        bool ovf = (op == '+') ? __builtin_add_overflow(x, y, &r)
                 : (op == '-') ? __builtin_sub_overflow(x, y, &r)
                               : __builtin_mul_overflow(x, y, &r);
        if (ovf) return Value::empty();
        handled = true;
        return intLadder(r, a.isNarrowInt() && b.isNarrowInt());
    }
    // \ and Mod keep Integer only when both operands were 16-bit-ish; a Double
    // operand promotes the result to Long (7 \ 2 is Integer, 7.6 Mod 2 is Long).
    static Value fitIntLike(long long r, const Value& a, const Value& b) {
        return intLadder(r, a.isNarrowInt() && b.isNarrowInt());
    }
    // Exact 64-bit path, used when either side is already a LongLong.
    static Value numResult(double r, const Value& a, const Value& b) {
        if (a.isIntish() && b.isIntish() && std::floor(r) == r) {
            if (a.isNarrowInt() && b.isNarrowInt() && r >= -32768 && r <= 32767)
                return Value::int16((int16_t)r);
            if (r >= INT32_MIN && r <= INT32_MAX) return Value::integer((int32_t)r);
        }
        return Value::number(r);
    }
    static int cmp(const Value& a, const Value& b) {
        bool as = a.type == Value::Type::String, bs = b.type == Value::Type::String;
        if (as && bs) { int c = a.s.compare(b.s); return c < 0 ? -1 : (c > 0 ? 1 : 0); }
        // Compare LongLong exactly rather than via double.
        if ((a.type == Value::Type::Int64 || b.type == Value::Type::Int64) && a.isIntish() && b.isIntish()) {
            long long x = a.toI64(), y = b.toI64();
            return x < y ? -1 : (x > y ? 1 : 0);
        }
        if (as || bs) {
            const Value& sv = as ? a : b;
            if (!sv.looksNumeric()) {
                std::string x = a.toStr(), y = b.toStr();
                int c = x.compare(y); return c < 0 ? -1 : (c > 0 ? 1 : 0);
            }
        }
        double x = a.toDouble(), y = b.toDouble();
        return x < y ? -1 : (x > y ? 1 : 0);
    }
    std::vector<Value> evalArgs(std::vector<ExprP>& es) {
        std::vector<Value> v; v.reserve(es.size());
        for (auto& e : es) v.push_back(eval(e.get()));
        return v;
    }
    StmtP classCallable(ClassInstance* self, const std::string& low) {
        auto& ci = *self->cls;
        auto g = ci.propGet.find(low); if (g != ci.propGet.end()) return g->second;
        auto m = ci.methods.find(low); if (m != ci.methods.end()) return m->second;
        return StmtP();
    }
    Value* varPtr(const std::string& low) {
        if (!frames.empty()) { auto it = frames.back().find(low); if (it != frames.back().end()) return &it->second; }
        if (!instanceStack.empty()) { auto& f = instanceStack.back()->fields; auto it = f.find(low); if (it != f.end()) return &it->second; }
        auto it = globals.find(low); if (it != globals.end()) return &it->second;
        return nullptr;
    }

    // ---------------------------------------------------------- arrays
    Value arrayGet(Value& av, std::vector<Value>& args) {
        std::vector<int> idx; for (auto& a : args) idx.push_back((int)a.toI64());
        return av.arr->data[av.arr->flatIndex(idx)];
    }
    void arraySet(Value& av, std::vector<Value>& args, const Value& v) {
        std::vector<int> idx; for (auto& a : args) idx.push_back((int)a.toI64());
        av.arr->data[av.arr->flatIndex(idx)] = v;
    }

    // ---------------------------------------------------------- scope R/W
    // Fast paths take an already-lowercased name (precomputed on the AST node).
    Value getVarValueL(const std::string& low) {
        if (!frames.empty()) { auto it = frames.back().find(low); if (it != frames.back().end()) return it->second; }
        if (!instanceStack.empty()) { auto& f = instanceStack.back()->fields; auto it = f.find(low); if (it != f.end()) return it->second; }
        { auto it = globals.find(low); if (it != globals.end()) return it->second; }
        if (!instanceStack.empty()) { StmtP d = classCallable(instanceStack.back(), low); if (d) { std::vector<Value> none; return callClassMethod(instanceStack.back(), d, none); } }
        if (procs.count(low))    { std::vector<ExprP> none; return callProc(procs[low], none, nullptr); }
        if (builtins.count(low)) { std::vector<Value> none; return builtins[low](*this, none); }
        if (optionExplicit) raiseErr(500, "Variable is undefined: '" + low + "'");
        return Value::empty();
    }
    void setVarValueL(const std::string& low, const Value& val) {
        if (!frames.empty()) { auto it = frames.back().find(low); if (it != frames.back().end()) { it->second = val; return; } }
        if (!instanceStack.empty()) { auto& f = instanceStack.back()->fields; auto it = f.find(low); if (it != f.end()) { it->second = val; return; } }
        { auto it = globals.find(low); if (it != globals.end()) { it->second = val; return; } }
        if (optionExplicit) raiseErr(500, "Variable is undefined: '" + low + "'");
        if (!frames.empty()) frames.back()[low] = val; else globals[low] = val;
    }
    Value getVarValue(const std::string& name) { return getVarValueL(toLower(name)); }
    void setVarValue(const std::string& name, const Value& val) { setVarValueL(toLower(name), val); }
    void declareVar(const std::string& name) {
        std::string low = toLower(name);
        if (!frames.empty()) frames.back()[low] = Value::empty(); else globals[low] = Value::empty();
    }
    void putVar(const std::string& name, const Value& v) {   // force-create in current scope
        std::string low = toLower(name);
        if (!frames.empty()) frames.back()[low] = v; else globals[low] = v;
    }

    // ---------------------------------------------------------- expressions
    Value eval(Expr* e) {
        switch (e->k) {
            case Expr::Lit: return e->lit;
            case Expr::Var:
                if (e->lname == "me") {
                    if (instanceStack.empty()) raiseErr(91, "'Me' is only valid inside a class");
                    return Value::object(instanceStack.back()->shared_from_this());
                }
                return getVarValueL(e->lname);
            case Expr::Unary: return unaryOp(e->name, eval(e->a.get()));
            case Expr::Binary: return binOp(e->name, eval(e->a.get()), eval(e->b.get()));
            case Expr::New: return evalNew(e->name);
            case Expr::Member: {
                Value tgt = e->a ? eval(e->a.get()) : withTarget();
                if (tgt.isNothing()) raiseErr(91, "Object variable not set");
                if (tgt.isObject() && tgt.obj) { anchorCom(tgt); std::vector<Value> none; return tgt.obj->get(*this, e->name, none); }
                raiseErr(424, "Object required");
            }
            case Expr::Index: return evalIndex(e);
        }
        return Value::empty();
    }
    Value withTarget() {
        if (withStack.empty()) raiseErr(91, "Invalid use of '.' outside With block");
        return withStack.back();
    }
    Value evalNew(const std::string& className) {
        std::string low = toLower(className);
        // Native engine objects (COM is reserved for CreateObject):
        if (low == "dictionary")   return Value::object(std::make_shared<DictionaryObject>());
        if (low == "list")         return Value::object(std::make_shared<ListObject>());
        if (low == "regexp")       return Value::object(std::make_shared<RegExpObject>());
        if (low == "filesystem")   return Value::object(std::make_shared<FileSystemObject>());
        if (low == "sound")        return Value::object(std::make_shared<SoundObject>());
        if (low == "mouse")        return Value::object(makeMouseObj());
        if (low == "screen")       return Value::object(makeScreenObj());
        if (low == "keyboard")     return Value::object(makeKeyboardObj());
        if (low == "clipboard")    return Value::object(makeClipboardObj());
        if (low == "shell")        return Value::object(std::make_shared<ShellObject>());
        if (low == "console")      return Value::object(std::make_shared<ConsoleObject>());
        if (low == "textwindow")   return Value::object(std::make_shared<TextWindowObject>());
        auto it = classes.find(low);
        if (it == classes.end()) raiseErr(500, "Class not defined: " + className);
        auto inst = std::make_shared<ClassInstance>();
        inst->cls = it->second;
        inst->interp = this;
        for (auto& f : it->second->fields) inst->fields[toLower(f)] = Value::empty();
        auto ini = it->second->methods.find("class_initialize");
        if (ini != it->second->methods.end()) { std::vector<Value> none; invoke(ini->second, none, inst.get(), nullptr); }
        return Value::object(inst);
    }
    Value evalIndex(Expr* e) {
        Expr* tgt = e->a.get();
        if (tgt->k == Expr::Var) {
            const std::string& low = tgt->lname;
            Value* vp = varPtr(low);
            if (vp && vp->isArray())  { auto a = evalArgs(e->args); return arrayGet(*vp, a); }
            if (vp && vp->isObject()) { if (!vp->obj) raiseErr(91, "Object variable not set"); anchorCom(*vp); auto a = evalArgs(e->args); return vp->obj->get(*this, "", a); }
            if (!instanceStack.empty()) { StmtP d = classCallable(instanceStack.back(), low); if (d) { auto a = evalArgs(e->args); return callClassMethod(instanceStack.back(), d, a); } }
            if (procs.count(low))    { auto a = evalArgs(e->args); return callProcV(procs[low], e->args, a, nullptr); }
            if (builtins.count(low)) { auto a = evalArgs(e->args); return builtins[low](*this, a); }
            if (vp) raiseErr(13, "Type mismatch (not callable): " + tgt->name);
            raiseErr(500, "Undefined: '" + tgt->name + "'");
        }
        if (tgt->k == Expr::Member) {
            Value obj = tgt->a ? eval(tgt->a.get()) : withTarget();
            if (obj.isNothing()) raiseErr(91, "Object variable not set");
            if (obj.isObject() && obj.obj) { anchorCom(obj); auto a = evalArgs(e->args); return obj.obj->get(*this, tgt->name, a); }
            raiseErr(424, "Object required");
        }
        Value tv = eval(tgt);
        auto a = evalArgs(e->args);
        if (tv.isArray()) return arrayGet(tv, a);
        if (tv.isObject() && tv.obj) { anchorCom(tv); return tv.obj->get(*this, "", a); }
        raiseErr(13, "Type mismatch");
    }

    Value unaryOp(const std::string& op, const Value& v) {
        if (op == "-") {
            if (v.isNull()) return Value::null();
            if (v.type == Value::Type::Int64) return Value::big(-v.i64);
            if (v.type == Value::Type::Int) {
                long long r = -(long long)v.i;         // -1 stays an Integer, so Hex(-1) is FFFF
                if (v.isub != Value::ISub::Long && r >= -32768 && r <= 32767) return Value::int16((int16_t)r);
                return fitInt(r);
            }
            return Value::number(-v.toDouble());
        }
        // Not
        if (v.isNull()) return Value::null();
        if (v.type == Value::Type::Bool) return Value::boolean(!v.b);
        long long nr = ~v.toI64();
        if (v.type == Value::Type::Int64) return Value::big(nr);
        if (v.isNarrowInt() && nr >= -32768 && nr <= 32767) return Value::int16((int16_t)nr);
        return fitInt(nr);
    }
    // Resolve an object to its default property/value in a value context (Directive
    // uses the class's Default member here). Non-objects pass through unchanged.
    Value defaultValue(const Value& v) {
        if (v.isObject() && v.obj) { Value out; if (v.obj->tryDefault(*this, out)) return out; }
        return v;
    }
    Value binOp(const std::string& op, const Value& aRaw, const Value& bRaw) {
        if (op == "Is") {
            IObject* pa = aRaw.isObject() ? aRaw.obj.get() : nullptr;
            IObject* pb = bRaw.isObject() ? bRaw.obj.get() : nullptr;
            return Value::boolean(pa == pb);
        }
        // Every other operator works on values: an object yields its default member.
        Value a = defaultValue(aRaw), b = defaultValue(bRaw);
        if (op == "&") return Value::str(a.toConcatStr() + b.toConcatStr());
        if (op == "And" || op == "Or" || op == "Xor" || op == "Eqv" || op == "Imp") {
            if (a.isNull() || b.isNull()) return Value::null();
            if (a.type == Value::Type::Bool && b.type == Value::Type::Bool) {
                bool x = a.b, y = b.b, r = false;
                if (op == "And") r = x && y; else if (op == "Or") r = x || y;
                else if (op == "Xor") r = x != y; else if (op == "Eqv") r = x == y; else r = (!x) || y;
                return Value::boolean(r);
            }
            long long x = a.toI64(), y = b.toI64(), r = 0;
            if (op == "And") r = x & y; else if (op == "Or") r = x | y;
            else if (op == "Xor") r = x ^ y; else if (op == "Eqv") r = ~(x ^ y); else r = (~x) | y;
            return fitIntLike(r, a, b);
        }
        if (op == "=" || op == "<>" || op == "<" || op == ">" || op == "<=" || op == ">=") {
            if (a.isNull() || b.isNull()) return Value::null();
            int c = cmp(a, b); bool r = false;
            if (op == "=") r = c == 0; else if (op == "<>") r = c != 0;
            else if (op == "<") r = c < 0; else if (op == ">") r = c > 0;
            else if (op == "<=") r = c <= 0; else r = c >= 0;
            return Value::boolean(r);
        }
        if (a.isNull() || b.isNull()) return Value::null();
        if (op == "+" || op == "-") {
            // VBScript: a Date plus or minus a number is still a Date; the
            // difference of two Dates is a plain number of days.
            bool ad = a.isDate(), bd = b.isDate();
            if (ad && bd) {
                // Adding two Dates combines them -- DateSerial(y,m,d) + TimeSerial(h,n,s)
                // is the standard way to build a date-and-time. Subtracting them gives
                // a plain count of days.
                if (op == "+") return Value::date(a.d + b.d);
            } else if (ad || bd) {
                double rv = ad ? (op == "+" ? a.d + b.toDouble() : a.d - b.toDouble())
                               : (op == "+" ? a.toDouble() + b.d : a.toDouble() - b.d);
                return Value::date(rv);
            }
        }
        if (op == "+") {
            if (a.type == Value::Type::String && b.type == Value::Type::String) return Value::str(a.s + b.s);
            bool done; Value ex = exactArith('+', a, b, done); if (done) return ex;
            return numResult(a.toDouble() + b.toDouble(), a, b);
        }
        double x = a.toDouble(), y = b.toDouble();
        if (op == "-" || op == "*") {
            bool done; Value ex = exactArith(op == "-" ? '-' : '*', a, b, done);
            if (done) return ex;
        }
        if (op == "-") return numResult(x - y, a, b);
        if (op == "*") return numResult(x * y, a, b);
        if (op == "/") { if (y == 0) raiseErr(11, "Division by zero"); return Value::number(x / y); }
        if (op == "\\") { long long iy = (long long)roundHalfEven(y); if (iy == 0) raiseErr(11, "Division by zero"); return fitIntLike((long long)roundHalfEven(x) / iy, a, b); }
        if (op == "Mod") { long long iy = (long long)roundHalfEven(y); if (iy == 0) raiseErr(11, "Division by zero"); return fitIntLike((long long)roundHalfEven(x) % iy, a, b); }
        if (op == "^") {
            if (x == 0 && y < 0) raiseErr(5, "Invalid procedure call or argument");
            double r = std::pow(x, y);
            // VBScript reports Overflow rather than handing back Infinity.
            if (std::isfinite(x) && std::isfinite(y) && !std::isfinite(r)) raiseErr(6, "Overflow");
            return Value::number(r);
        }
        raiseErr(1, "Unknown operator " + op);
    }

    // ---------------------------------------------------------- statements
    void execBlock(std::vector<StmtP>& b) { for (auto& s : b) execOne(s); }
    void execOne(StmtP& s) {
        // Release any COM intermediates this statement anchors, however it exits
        // (normal return, error, or Exit/Quit signal).
        struct AnchorScope { std::vector<Value>& v; size_t mark; ~AnchorScope() { if (v.size() > mark) v.resize(mark); } }
            _anchor{comAnchors, comAnchors.size()};
        if (!onErrorResumeNext) { exec(s.get()); return; }
        try { exec(s.get()); }
        catch (DirectiveError& e) { errObj->number = e.number; errObj->source = e.source; errObj->description = e.description; }
        // ExitSignal / QuitSignal propagate
    }
    void exec(Stmt* s) {
        if (s->line) curLine = s->line;
        if (s->col)  curCol = s->col;
        switch (s->k) {
            case Stmt::OptionS: optionExplicit = true; break;
            case Stmt::OnErrorS: onErrorResumeNext = (s->errMode == 1); break;
            case Stmt::SubDecl: case Stmt::FuncDecl: case Stmt::ClassDecl:
            case Stmt::PropDecl: break;   // handled at registration
            case Stmt::DimS: {
                for (auto& d : s->decls) {
                    if (d.second.empty()) { declareVar(d.first); }
                    else if (d.second.size() == 1 && !d.second[0]) {   // Dim a()  -> dynamic
                        auto ad = std::make_shared<ArrayData>(); ad->uppers = { -1 };
                        putVar(d.first, Value::array(ad));
                    } else {
                        auto ad = std::make_shared<ArrayData>();
                        for (auto& de : d.second) ad->uppers.push_back((int)eval(de.get()).toI64());
                        ad->data.assign(ad->total(), Value::empty());
                        putVar(d.first, Value::array(ad));
                    }
                }
                break;
            }
            case Stmt::ReDimS: {
                std::vector<int> up; for (auto& de : s->dims) up.push_back((int)eval(de.get()).toI64());
                std::string low = toLower(s->name);
                Value* vp = varPtr(low);
                if (vp && vp->isArray()) vp->arr->redim(up, s->preserve);
                else { auto ad = std::make_shared<ArrayData>(); ad->redim(up, false); setVarValue(s->name, Value::array(ad)); }
                break;
            }
            case Stmt::ConstS:
                for (auto& c : s->consts) putVar(c.first, cloneIfArray(eval(c.second.get())));
                break;
            case Stmt::Assign:    assignTo(s->target.get(), cloneIfArray(eval(s->value.get())), false); break;
            case Stmt::SetAssign: assignTo(s->target.get(), eval(s->value.get()), true); break;
            case Stmt::CallS:     execCall(s); break;
            case Stmt::ExitS: {
                const std::string& w = s->name;
                if (w == "for") throw ExitSignal{ ExitSignal::For };
                if (w == "do")  throw ExitSignal{ ExitSignal::Do };
                if (w == "function") throw ExitSignal{ ExitSignal::Function };
                if (w == "property") throw ExitSignal{ ExitSignal::Property };
                throw ExitSignal{ ExitSignal::Sub };
            }
            case Stmt::IfS: {
                if (truth(eval(s->cond.get()))) { execBlock(s->body); break; }
                bool done = false;
                for (auto& ei : s->elifs) if (truth(eval(ei.first.get()))) { execBlock(ei.second); done = true; break; }
                if (!done) execBlock(s->elseBody);
                break;
            }
            case Stmt::WhileS:
                while (truth(eval(s->cond.get()))) execBlock(s->body);
                break;
            case Stmt::DoLoopS: execDo(s); break;
            case Stmt::ForS: execFor(s); break;
            case Stmt::ForEachS: execForEach(s); break;
            case Stmt::SelectS: execSelect(s); break;
            case Stmt::WithS: {
                withStack.push_back(eval(s->coll.get()));
                try { execBlock(s->body); } catch (...) { withStack.pop_back(); throw; }
                withStack.pop_back();
                break;
            }
            case Stmt::EraseS: {
                for (auto& tgt : s->callArgs) {
                    auto ad = std::make_shared<ArrayData>(); ad->uppers = { -1 };
                    assignTo(tgt.get(), Value::array(ad), false);
                }
                break;
            }
            case Stmt::MidS: {
                // Mid(strVar, start[, length]) = value  — replace in place, never changing length.
                std::string str = eval(s->target.get()).toStr();
                long start = eval(s->callArgs[0].get()).toI64();          // 1-based
                std::string repl = eval(s->value.get()).toStr();
                if (start < 1 || start > (long)str.size())
                    raiseErr(5, "Invalid procedure call or argument");
                long pos = start - 1;
                long avail = (long)str.size() - pos;                      // chars we may overwrite
                long n = (long)repl.size();
                if (s->callArgs.size() == 2) { long len = eval(s->callArgs[1].get()).toI64(); if (len < n) n = len; }
                if (n > avail) n = avail;
                for (long k = 0; k < n; ++k) str[pos + k] = repl[k];
                assignTo(s->target.get(), Value::str(str), false);
                break;
            }
        }
    }
    static Value forStep(double v) {
        if (std::floor(v) == v && v >= INT32_MIN && v <= INT32_MAX) return Value::integer((int32_t)v);
        return Value::number(v);
    }
    void execFor(Stmt* s) {
        double from = eval(s->fromE.get()).toDouble();
        double to   = eval(s->toE.get()).toDouble();
        double step = s->stepE ? eval(s->stepE.get()).toDouble() : 1.0;
        setVarValueL(s->lname, forStep(from));
        Value* slot = varPtr(s->lname);   // element address is stable across the loop (unordered_map guarantee)
        while (true) {
            double v = slot->toDouble();
            if (step >= 0 ? v > to : v < to) break;
            try { execBlock(s->body); }
            catch (ExitSignal& sig) { if (sig.kind == ExitSignal::For) break; throw; }
            *slot = forStep(slot->toDouble() + step);
        }
    }
    void execForEach(Stmt* s) {
        Value coll = eval(s->coll.get());
        std::vector<Value> items;
        if (coll.isArray()) items = coll.arr->data;
        else if (coll.isObject() && coll.obj) { if (!coll.obj->enumerate(*this, items)) raiseErr(451, "Object not a collection"); }
        else if (coll.isEmpty()) return;
        else raiseErr(451, "Object not a collection");
        if (items.empty()) return;
        setVarValueL(s->lname, Value::empty());
        Value* slot = varPtr(s->lname);
        for (auto& it : items) {
            *slot = it;
            try { execBlock(s->body); }
            catch (ExitSignal& sig) { if (sig.kind == ExitSignal::For) break; throw; }
        }
    }
    void execDo(Stmt* s) {
        auto test = [&]() { bool t = truth(eval(s->cond.get())); return s->isUntil ? !t : t; };
        if (s->testPos == 1) {
            while (test()) { try { execBlock(s->body); } catch (ExitSignal& g) { if (g.kind == ExitSignal::Do) break; throw; } }
        } else if (s->testPos == 2) {
            do { try { execBlock(s->body); } catch (ExitSignal& g) { if (g.kind == ExitSignal::Do) break; throw; } } while (test());
        } else {
            while (true) { try { execBlock(s->body); } catch (ExitSignal& g) { if (g.kind == ExitSignal::Do) break; throw; } }
        }
    }
    void execSelect(Stmt* s) {
        Value v = eval(s->coll.get());
        int elseIdx = -1;
        for (size_t ci = 0; ci < s->cases.size(); ++ci) {
            auto& cc = s->cases[ci];
            if (cc.tests.empty()) { elseIdx = (int)ci; continue; }
            for (auto& t : cc.tests) {
                bool match = false;
                if (t.k == CaseTest::Val)      match = cmp(v, eval(t.e1.get())) == 0;
                else if (t.k == CaseTest::Range){ Value lo = eval(t.e1.get()), hi = eval(t.e2.get()); match = cmp(v, lo) >= 0 && cmp(v, hi) <= 0; }
                else { Value r = eval(t.e1.get()); int c = cmp(v, r);
                       const std::string& o = t.op;
                       match = (o == "=" && c == 0) || (o == "<>" && c != 0) || (o == "<" && c < 0) ||
                               (o == ">" && c > 0) || (o == "<=" && c <= 0) || (o == ">=" && c >= 0); }
                if (match) { execBlock(cc.body); return; }
            }
        }
        if (elseIdx >= 0) execBlock(s->cases[elseIdx].body);
    }

    void execCall(Stmt* s) {
        Expr* callee; std::vector<ExprP>* argExprs; std::vector<ExprP> empty;
        if (!s->callArgs.empty()) { callee = s->callee.get(); argExprs = &s->callArgs; }
        else if (s->callee->k == Expr::Index) { callee = s->callee->a.get(); argExprs = &s->callee->args; }
        else { callee = s->callee.get(); argExprs = &empty; }

        if (callee->k == Expr::Var) {
            const std::string& low = callee->lname;
            if (procs.count(low)) { auto a = evalArgs(*argExprs); callProcV(procs[low], *argExprs, a, nullptr); return; }
            if (!instanceStack.empty()) { StmtP d = classCallable(instanceStack.back(), low); if (d) { auto a = evalArgs(*argExprs); callClassMethod(instanceStack.back(), d, a); return; } }
            if (builtins.count(low)) { auto a = evalArgs(*argExprs); builtins[low](*this, a); return; }
            Value* vp = varPtr(low);
            if (vp && vp->isObject() && vp->obj) { anchorCom(*vp); auto a = evalArgs(*argExprs); vp->obj->get(*this, "", a); return; }
            raiseErr(13, "Type mismatch: '" + callee->name + "'");
        }
        if (callee->k == Expr::Member) {
            Value obj = callee->a ? eval(callee->a.get()) : withTarget();
            if (obj.isNothing()) raiseErr(91, "Object variable not set");
            if (obj.isObject() && obj.obj) { anchorCom(obj); auto a = evalArgs(*argExprs); obj.obj->get(*this, callee->name, a); return; }
            raiseErr(424, "Object required");
        }
        eval(s->callee.get());   // fallback: just evaluate
    }

    // ---------------------------------------------------------- assignment
    void assignTo(Expr* lv, const Value& val, bool isSet) {
        if (lv->k == Expr::Var) { setVarValueL(lv->lname, val); return; }
        if (lv->k == Expr::Index) {
            Expr* t = lv->a.get();
            auto idx = evalArgs(lv->args);
            if (t->k == Expr::Var) {
                std::string low = toLower(t->name);
                Value* vp = varPtr(low);
                if (vp && vp->isArray())  { arraySet(*vp, idx, val); return; }
                if (vp && vp->isObject() && vp->obj) { vp->obj->set(*this, "", idx, val, isSet); return; }
                raiseErr(9, "Subscript out of range / not an array: " + t->name);
            }
            if (t->k == Expr::Member) {
                Value obj = t->a ? eval(t->a.get()) : withTarget();
                if (obj.isObject() && obj.obj) { anchorCom(obj); obj.obj->set(*this, t->name, idx, val, isSet); return; }
                raiseErr(424, "Object required");
            }
            Value tv = eval(lv->a.get());
            if (tv.isArray()) { arraySet(tv, idx, val); return; }
            if (tv.isObject() && tv.obj) { anchorCom(tv); tv.obj->set(*this, "", idx, val, isSet); return; }
            raiseErr(13, "Type mismatch");
        }
        if (lv->k == Expr::Member) {
            Value obj = lv->a ? eval(lv->a.get()) : withTarget();
            if (obj.isNothing()) raiseErr(91, "Object variable not set");
            if (obj.isObject() && obj.obj) { anchorCom(obj); std::vector<Value> none; obj.obj->set(*this, lv->name, none, val, isSet); return; }
            raiseErr(424, "Object required");
        }
        raiseErr(1, "Cannot assign to this expression");
    }

    // ---------------------------------------------------------- proc calls
    Value invoke(StmtP decl, std::vector<Value>& argv, ClassInstance* self,
                 std::unordered_map<std::string, Value>* outFrame) {
        // Guard against runaway recursion: raise a catchable error instead of
        // overflowing the C++ stack and crashing the process. (frames.size() is
        // the current call depth.)
        if (frames.size() >= 2000) raiseErr(28, "Out of stack space");
        // recycle a frame map from the pool (keeps its bucket allocation) instead of allocating anew
        if (!framePool.empty()) { frames.push_back(std::move(framePool.back())); framePool.pop_back(); frames.back().clear(); }
        else frames.push_back({});
        size_t fi = frames.size() - 1;
        frames[fi].reserve(decl->params.size() + 2);
        for (size_t i = 0; i < decl->params.size(); ++i) {
            const std::string& pn = decl->params[i].lname;
            if (decl->params[i].byVal && i < argv.size() && argv[i].isArray())
                frames[fi][pn] = cloneIfArray(argv[i]);
            else
                frames[fi][pn] = i < argv.size() ? argv[i] : Value::empty();
        }
        bool retByName = decl->isFunction || (decl->k == Stmt::PropDecl && decl->propKind == 0);
        if (retByName) frames[fi][decl->lname] = Value::empty();
        if (self) instanceStack.push_back(self);
        bool saved = onErrorResumeNext; onErrorResumeNext = false;
        try { execBlock(decl->body); }
        catch (ExitSignal&) { }
        catch (...) {
            onErrorResumeNext = saved; if (self) instanceStack.pop_back();
            framePool.push_back(std::move(frames.back())); frames.pop_back(); throw;
        }
        Value ret = retByName ? std::move(frames[fi][decl->lname]) : Value::empty();
        if (outFrame) *outFrame = std::move(frames[fi]);   // only when ByRef writeback is needed
        onErrorResumeNext = saved; if (self) instanceStack.pop_back();
        // Pop the frame OFF the stack before destroying its locals: destroying an
        // object may run Class_Terminate, which can call functions that push onto
        // `frames` (and reallocate it). Clearing a detached map keeps that safe.
        std::unordered_map<std::string, Value> done = std::move(frames.back());
        frames.pop_back();
        done.clear();                                      // fires Class_Terminate for locals now
        framePool.push_back(std::move(done));              // empty map (keeps buckets) back to the pool
        return ret;
    }
    Value callProcV(StmtP decl, std::vector<ExprP>& argExprs, std::vector<Value>& argv, ClassInstance* self) {
        // Only capture the frame for ByRef write-back if some argument is actually an
        // lvalue (Var/Index/Member). For expression/literal args (the common case) this
        // avoids copying the whole frame map on every call.
        size_t np = decl->params.size();
        bool needWriteback = false;
        for (size_t i = 0; i < np && i < argExprs.size(); ++i) {
            if (decl->params[i].byVal) continue;
            Expr::K k = argExprs[i]->k;
            if (k == Expr::Var || k == Expr::Index || k == Expr::Member) { needWriteback = true; break; }
        }
        if (!needWriteback) return invoke(decl, argv, self, nullptr);

        std::unordered_map<std::string, Value> outFrame;
        Value ret = invoke(decl, argv, self, &outFrame);
        for (size_t i = 0; i < np && i < argExprs.size(); ++i) {
            if (decl->params[i].byVal) continue;
            Expr* ax = argExprs[i].get();
            if (ax->k == Expr::Var || ax->k == Expr::Index || ax->k == Expr::Member) {
                auto it = outFrame.find(decl->params[i].lname);
                if (it != outFrame.end()) assignTo(ax, it->second, false);
            }
        }
        return ret;
    }
    Value callProc(StmtP decl, std::vector<ExprP>& argExprs, ClassInstance* self) {
        auto argv = evalArgs(argExprs);
        return callProcV(decl, argExprs, argv, self);
    }

    // ---------------------------------------------------------- class reg
    void registerClass(StmtP c) {
        auto ci = std::make_shared<ClassInfo>();
        ci->name = c->name;
        for (auto& m : c->members) {
            if (m->k == Stmt::DimS) { for (auto& d : m->decls) ci->fields.push_back(d.first); }
            else if (m->k == Stmt::SubDecl || m->k == Stmt::FuncDecl) ci->methods[toLower(m->name)] = m;
            else if (m->k == Stmt::PropDecl) {
                if (m->propKind == 0) ci->propGet[toLower(m->name)] = m;
                else if (m->propKind == 1) ci->propLet[toLower(m->name)] = m;
                else ci->propSet[toLower(m->name)] = m;
            }
            if (m->isDefault) ci->defaultMember = toLower(m->name);
        }
        classes[toLower(c->name)] = ci;
    }

    // defined out-of-line below
    void setupConstants();
    void setupObjects();
    void registerBuiltins();

    // expose to builtins that need object creation
public:
    Value createObjectByName(const std::string& progid) {
        // CreateObject is reserved for real COM/ActiveX. Native objects use New.
        bool ok = false;
        ObjectPtr o = createComObject(progid, ok);
        if (ok) return Value::object(o);
        raiseErr(429, "ActiveX component can't create object: '" + progid +
                      "'  (CreateObject makes real COM calls, available on Windows only; "
                      "for engine objects use New, e.g. Set d = New Dictionary)");
    }
    std::shared_ptr<ErrObject> err() { return errObj; }
};

// ---- ClassInstance member access (needs full Interpreter) ----
// ---- function reference (GetRef) ----
struct FuncRefObject : IObject {
    std::string name;   // lowercased proc/builtin name
    explicit FuncRefObject(std::string n) : name(std::move(n)) {}
    std::string typeName() const override { return "Function"; }
    Value get(Interpreter& in, const std::string& member, std::vector<Value>& args) override {
        if (member.empty()) return in.callByName(name, args);   // f(args)
        raiseErr(438, "Function reference has no member '" + member + "'");
    }
};
Value Interpreter::makeFuncRef(const std::string& name) {
    std::string low = toLower(name);
    if (!procs.count(low) && !builtins.count(low))
        raiseErr(5, "GetRef: '" + name + "' is not a defined Sub, Function, or built-in");
    return Value::object(std::make_shared<FuncRefObject>(low));
}

ClassInstance::~ClassInstance() { if (interp) interp->runTerminator(this); }

bool ClassInstance::tryDefault(Interpreter& in, Value& out) {
    if (!cls || cls->defaultMember.empty()) return false;
    std::vector<Value> none;
    out = get(in, std::string(), none);   // "" routes to the default member
    return true;
}

Value ClassInstance::get(Interpreter& in, const std::string& name, std::vector<Value>& args) {    std::string low = toLower(name);
    auto& ci = *cls;
    // Empty member name => the class's Default member (for `o(args)` / value coercion).
    if (low.empty() && !ci.defaultMember.empty()) low = ci.defaultMember;
    auto pg = ci.propGet.find(low);
    auto m  = ci.methods.find(low);
    if (pg != ci.propGet.end() || m != ci.methods.end()) {
        StmtP decl = (pg != ci.propGet.end()) ? pg->second : m->second;
        size_t np = decl->params.size();
        if (args.size() > np) {
            // More arguments than the member declares: call it with the args it
            // expects, then apply the leftover args to the RESULT (Directive treats
            // `obj.Prop(i)` on a no-arg getter as indexing the returned value).
            std::vector<Value> head(args.begin(), args.begin() + np);
            Value r = in.callClassMethod(this, decl, head);
            std::vector<Value> tail(args.begin() + np, args.end());
            if (r.isArray())                    return in.arrayGetPub(r, tail);
            if (r.isObject() && r.obj)          return r.obj->get(in, "", tail);
            raiseErr(13, "Type mismatch");
        }
        return in.callClassMethod(this, decl, args);
    }
    auto f  = fields.find(low);
    if (f != fields.end()) {
        if (args.empty()) return f->second;
        if (f->second.isArray())  return in.arrayGetPub(f->second, args);
        if (f->second.isObject() && f->second.obj) return f->second.obj->get(in, "", args);
        raiseErr(13, "Type mismatch");
    }
    raiseErr(438, "Object doesn't support this property or method: " + name);
}
void ClassInstance::set(Interpreter& in, const std::string& name, std::vector<Value>& args,
                        const Value& val, bool isSet) {
    std::string low = toLower(name);
    auto& ci = *cls;
    StmtP prop;
    if (isSet) { auto s = ci.propSet.find(low); if (s != ci.propSet.end()) prop = s->second;
                 else { auto l = ci.propLet.find(low); if (l != ci.propLet.end()) prop = l->second; } }
    else       { auto l = ci.propLet.find(low); if (l != ci.propLet.end()) prop = l->second;
                 else { auto s = ci.propSet.find(low); if (s != ci.propSet.end()) prop = s->second; } }
    if (prop) { std::vector<Value> argv = args; argv.push_back(val); in.callClassMethod(this, prop, argv); return; }
    auto f = fields.find(low);
    if (f != fields.end()) {
        if (args.empty()) { f->second = val; return; }
        if (f->second.isArray()) { in.arraySetPub(f->second, args, val); return; }
        if (f->second.isObject() && f->second.obj) { f->second.obj->set(in, "", args, val, isSet); return; }
        raiseErr(13, "Type mismatch");
    }
    fields[low] = val;   // lenient: allow late field creation
}

// ---- constants ----
void Interpreter::setupConstants() {
    // Built-in constants (Directive-branded ds* names only).
    auto C = [&](const char* n, Value v) { globals[toLower(n)] = v; };
    C("dsCr", Value::str("\r")); C("dsLf", Value::str("\n")); C("dsCrLf", Value::str("\r\n"));
    C("dsNewLine", Value::str("\r\n")); C("dsTab", Value::str("\t")); C("dsNullString", Value::str(""));
    C("dsNullChar", Value::str(std::string(1, '\0'))); C("dsBack", Value::str("\b"));
    C("dsFormFeed", Value::str("\f")); C("dsVerticalTab", Value::str("\v"));
    C("dsTrue", Value::integer(-1)); C("dsFalse", Value::integer(0));
    C("dsBinaryCompare", Value::integer(0)); C("dsTextCompare", Value::integer(1));
    // VarType + MsgBox + weekday + FormatDateTime constants
    const std::pair<const char*, int> ints[] = {
        {"dsEmpty",0},{"dsNull",1},{"dsInteger",2},{"dsLong",3},{"dsSingle",4},{"dsDouble",5},
        {"dsCurrency",6},{"dsDate",7},{"dsString",8},{"dsObject",9},{"dsError",10},{"dsBoolean",11},
        {"dsVariant",12},{"dsByte",17},{"dsArray",8192},
        {"dsOKOnly",0},{"dsOKCancel",1},{"dsAbortRetryIgnore",2},{"dsYesNoCancel",3},{"dsYesNo",4},
        {"dsRetryCancel",5},{"dsCritical",16},{"dsQuestion",32},{"dsExclamation",48},{"dsInformation",64},
        {"dsOK",1},{"dsCancel",2},{"dsAbort",3},{"dsRetry",4},{"dsIgnore",5},{"dsYes",6},{"dsNo",7},
        {"dsSunday",1},{"dsMonday",2},{"dsTuesday",3},{"dsWednesday",4},{"dsThursday",5},
        {"dsFriday",6},{"dsSaturday",7},{"dsUseSystemDayOfWeek",0},{"dsFirstJan1",1},
        {"dsGeneralDate",0},{"dsLongDate",1},{"dsShortDate",2},{"dsLongTime",3},{"dsShortTime",4},
        // Console colours. Same numbering as cmd.exe's `color` command, so
        // dsBlue is 1 and dsRed is 4 (bits: 1=blue, 2=green, 4=red, +8=bright).
        // dsYellow (6) is the dark/brown yellow; dsBrightYellow (14) is vivid.
        {"dsLongLong",20},   // VarType of a Directive LongLong (VT_I8)
        {"dsBlack",0},{"dsBlue",1},{"dsGreen",2},{"dsCyan",3},{"dsRed",4},
        {"dsMagenta",5},{"dsYellow",6},{"dsWhite",7},{"dsGray",8},{"dsBrightBlue",9},
        {"dsBrightGreen",10},{"dsBrightCyan",11},{"dsBrightRed",12},
        {"dsBrightMagenta",13},{"dsBrightYellow",14},{"dsBrightWhite",15},
    };
    for (auto& kv : ints) C(kv.first, Value::integer(kv.second));
    C("dsObjectError", Value::number((double)0x80040000u - 4294967296.0)); // -2147221504
}
void Interpreter::setupObjects() {
    errObj = std::make_shared<ErrObject>();
    globals["err"] = Value::object(errObj);
    directiveObj = std::make_shared<DirectiveObject>();
    globals["directive"] = Value::object(directiveObj);
}

// ---- small string helpers for builtins ----
static size_t u8Step(unsigned char c);                    // defined with the UTF-8 helpers
static std::string utf8Encode(unsigned long cp);
static unsigned long utf8First(const std::string& t);

// Case folding over code points, not bytes, so UCase("cafe" with acute) gives
// "CAFE" with a capital acute rather than leaving it untouched. Covers ASCII, the
// Latin-1 supplement, Latin Extended-A, Greek and Cyrillic -- i.e. the alphabets
// a European script is likely to meet. Anything else is passed through unchanged.
static unsigned long foldCp(unsigned long cp, bool up) {
    if (cp < 0x80) return up ? (unsigned long)std::toupper((int)cp) : (unsigned long)std::tolower((int)cp);
    if (up) {
        if (cp >= 0xE0 && cp <= 0xFE && cp != 0xF7) return cp - 0x20;   // Latin-1
        if (cp == 0xFF) return 0x178;                                    // y diaeresis
        if (cp >= 0x100 && cp <= 0x17F) {                                // Latin Ext-A pairs
            if (cp == 0x131 || cp == 0x138 || cp == 0x149) return cp;
            if (cp == 0x17F) return 0x53;
            if (cp >= 0x139 && cp <= 0x148) return (cp % 2 == 0) ? cp - 1 : cp;
            if (cp >= 0x14A && cp <= 0x177) return (cp % 2 == 1) ? cp - 1 : cp;
            return (cp % 2 == 1) ? cp - 1 : cp;
        }
        if (cp >= 0x3B1 && cp <= 0x3C9 && cp != 0x3C2) return cp - 0x20; // Greek
        if (cp == 0x3C2) return 0x3A3;                                   // final sigma
        if (cp >= 0x430 && cp <= 0x44F) return cp - 0x20;                // Cyrillic
        if (cp >= 0x450 && cp <= 0x45F) return cp - 0x50;
        return cp;
    }
    if (cp >= 0xC0 && cp <= 0xDE && cp != 0xD7) return cp + 0x20;
    if (cp == 0x178) return 0xFF;
    if (cp >= 0x100 && cp <= 0x17F) {
        if (cp >= 0x139 && cp <= 0x148) return (cp % 2 == 1) ? cp + 1 : cp;
        if (cp >= 0x14A && cp <= 0x177) return (cp % 2 == 0) ? cp + 1 : cp;
        return (cp % 2 == 0) ? cp + 1 : cp;
    }
    if (cp >= 0x391 && cp <= 0x3A9) return cp + 0x20;
    if (cp >= 0x410 && cp <= 0x42F) return cp + 0x20;
    if (cp >= 0x400 && cp <= 0x40F) return cp + 0x50;
    return cp;
}
static std::string foldCase(const std::string& t, bool up) {
    std::string o; o.reserve(t.size());
    for (size_t i = 0; i < t.size(); ) {
        size_t st = u8Step((unsigned char)t[i]);
        if (i + st > t.size()) st = 1;
        if (st == 1 && (unsigned char)t[i] < 0x80) o += (char)foldCp((unsigned char)t[i], up);
        else o += utf8Encode(foldCp(utf8First(t.substr(i, st)), up));
        i += st;
    }
    return o;
}
static std::string upper(std::string s){ return foldCase(s, true); }
static std::string lower(std::string s){ return foldCase(s, false); }
static bool parseDateToSerial(const std::string& in, double& out) {
    std::string s = in; size_t a = s.find_first_not_of(" \t"); if (a==std::string::npos) return false;
    size_t z = s.find_last_not_of(" \t"); s = s.substr(a, z-a+1);
    int y,mo,d,h=0,mi=0,se=0;
    if (std::sscanf(s.c_str(), "%d-%d-%d %d:%d:%d", &y,&mo,&d,&h,&mi,&se) >= 3) { out = serialFromYMDHMS(y,mo,d,h,mi,se); return true; }
    {   // Slash dates follow the locale's field order: 1/2/2020 is 2 January in
        // the United States but 1 February in most of Europe, exactly as VBScript.
        int f1, f2;
        if (std::sscanf(s.c_str(), "%d/%d/%d %d:%d:%d", &f1,&f2,&y,&h,&mi,&se) >= 3) {
            if (g_loc.dayFirst) { d = f1; mo = f2; } else { mo = f1; d = f2; }
            out = serialFromYMDHMS(y,mo,d,h,mi,se); return true;
        }
    }
    if (std::sscanf(s.c_str(), "%d:%d:%d", &h,&mi,&se) >= 2) { out = serialFromYMDHMS(1899,12,30,h,mi,se); return true; }
    return false;
}

// ---- builtins ----
// Reinterpret an integer argument at its own width for Hex/Oct.
static unsigned long long intWidthOf(std::vector<Value>& a) {
    if (a.empty()) return 0ULL;
    long long n = a[0].toI64();
    if (a[0].type == Value::Type::Int64) return (unsigned long long)n;   // full 64-bit
    if (a[0].type == Value::Type::Int) {
        if (a[0].isub == Value::ISub::Byte)    return (unsigned long long)(unsigned char)n;
        if (a[0].isub == Value::ISub::Integer) return (unsigned long long)(unsigned short)(short)n;
    }
    return (unsigned long long)(uint32_t)(int32_t)n;
}
// fmtGrouped produces US punctuation; translate it into the active locale.
static std::string localizeGrouped(const std::string& t) {
    if (g_loc.decimalSep == "." && g_loc.thousandsSep == ",") return t;
    std::string out;
    for (char c : t) {
        if (c == ',')      out += g_loc.thousandsSep;
        else if (c == '.') out += g_loc.decimalSep;
        else               out += c;
    }
    return out;
}
static std::string localeCurrency(const std::string& amount) {
    switch (g_loc.currencyPos) {
        case 1:  return amount + g_loc.currencySym;
        case 2:  return g_loc.currencySym + " " + amount;
        case 3:  return amount + " " + g_loc.currencySym;
        default: return g_loc.currencySym + amount;
    }
}
// Windows-1252 mappings for bytes 0x80-0x9F, where it differs from Latin-1.
// Used by Chr/Asc so Chr(147) yields a left double quote rather than a control
// character. The same table is used on every platform, so Linux and Windows agree.
static const unsigned short kCp1252High[32] = {
    0x20AC, 0x0081, 0x201A, 0x0192, 0x201E, 0x2026, 0x2020, 0x2021,
    0x02C6, 0x2030, 0x0160, 0x2039, 0x0152, 0x008D, 0x017D, 0x008F,
    0x0090, 0x2018, 0x2019, 0x201C, 0x201D, 0x2022, 0x2013, 0x2014,
    0x02DC, 0x2122, 0x0161, 0x203A, 0x0153, 0x009D, 0x017E, 0x0178
};
// VBScript strings are UTF-16, so Len and every indexing function count UTF-16
// code units: a euro sign is 1, an emoji (surrogate pair) is 2. Directive stores
// UTF-8 internally, so these map between byte offsets and code-unit indices.
// Without them Len("h" e-acute) is 3, Left cuts a character in half and StrReverse
// reverses raw bytes into invalid UTF-8.
static size_t u8Step(unsigned char c) {
    if (c >= 0xF0) return 4;
    if (c >= 0xE0) return 3;
    if (c >= 0xC0) return 2;
    return 1;                       // ASCII, or a stray continuation byte
}
static size_t u16Length(const std::string& t) {
    size_t n = 0;
    for (size_t i = 0; i < t.size(); ) {
        size_t st = u8Step((unsigned char)t[i]);
        if (i + st > t.size()) st = 1;
        n += (st == 4) ? 2 : 1;     // astral characters occupy a surrogate pair
        i += st;
    }
    return n;
}
static size_t u16ToByte(const std::string& t, size_t idx) {
    size_t units = 0, i = 0;
    while (i < t.size() && units < idx) {
        size_t st = u8Step((unsigned char)t[i]);
        if (i + st > t.size()) st = 1;
        units += (st == 4) ? 2 : 1;
        i += st;
    }
    return i;
}
static size_t byteToU16(const std::string& t, size_t off) {
    size_t units = 0, i = 0;
    while (i < t.size() && i < off) {
        size_t st = u8Step((unsigned char)t[i]);
        if (i + st > t.size()) st = 1;
        units += (st == 4) ? 2 : 1;
        i += st;
    }
    return units;
}
// Encode one code point as UTF-8.
static std::string utf8Encode(unsigned long cp) {
    std::string o;
    if (cp < 0x80) o += (char)cp;
    else if (cp < 0x800) {
        o += (char)(0xC0 | (cp >> 6));
        o += (char)(0x80 | (cp & 0x3F));
    } else if (cp < 0x10000) {
        o += (char)(0xE0 | (cp >> 12));
        o += (char)(0x80 | ((cp >> 6) & 0x3F));
        o += (char)(0x80 | (cp & 0x3F));
    } else {
        o += (char)(0xF0 | (cp >> 18));
        o += (char)(0x80 | ((cp >> 12) & 0x3F));
        o += (char)(0x80 | ((cp >> 6) & 0x3F));
        o += (char)(0x80 | (cp & 0x3F));
    }
    return o;
}
// Decode the first UTF-8 character of s; 0 when empty. Invalid bytes come back
// as themselves so nothing is silently lost.
static unsigned long utf8First(const std::string& s) {
    if (s.empty()) return 0;
    unsigned char c = (unsigned char)s[0];
    size_t need = (c >= 0xF0) ? 3 : (c >= 0xE0) ? 2 : (c >= 0xC0) ? 1 : 0;
    if (need == 0 || s.size() <= need) return c;
    unsigned long cp = c & (0x3F >> need);
    for (size_t i = 1; i <= need; ++i) {
        unsigned char k = (unsigned char)s[i];
        if ((k & 0xC0) != 0x80) return c;
        cp = (cp << 6) | (unsigned long)(k & 0x3F);
    }
    return cp;
}
static const char* kMonths[12] = {"January","February","March","April","May","June",
                                  "July","August","September","October","November","December"};
static const char* kDays[7] = {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
static std::string fmtGrouped(double v, int digits, bool group) {
    char buf[64]; std::snprintf(buf, sizeof(buf), "%.*f", digits < 0 ? 2 : digits, v);
    std::string s = buf;
    bool neg = !s.empty() && s[0] == '-'; if (neg) s = s.substr(1);
    size_t dot = s.find('.');
    std::string ip = (dot == std::string::npos) ? s : s.substr(0, dot);
    std::string fp = (dot == std::string::npos) ? "" : s.substr(dot);
    if (group) {
        std::string g; int c = 0;
        for (int i = (int)ip.size() - 1; i >= 0; --i) { g.push_back(ip[i]); if (++c % 3 == 0 && i > 0) g.push_back(','); }
        std::reverse(g.begin(), g.end()); ip = g;
    }
    return (neg ? "-" : "") + ip + fp;
}

void Interpreter::registerBuiltins() {
    auto& B = builtins;
    auto S  = [](std::vector<Value>& a, size_t i)->std::string { return i < a.size() ? a[i].toStr() : std::string(); };
    auto D  = [](std::vector<Value>& a, size_t i)->double { return i < a.size() ? a[i].toDouble() : 0.0; };
    auto N  = [](std::vector<Value>& a, size_t i)->long long { return i < a.size() ? a[i].toI64() : 0; };
    auto has = [](std::vector<Value>& a, size_t i){ return i < a.size() && !a[i].isEmpty(); };

    // ---- strings ----
    B["len"]    = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull()) return Value::null(); return Value::integer((int32_t)u16Length(S(a,0))); };
    B["left"]   = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::string s=S(a,0); long n=(long)N(a,1); if(n<0) raiseErr(5, "Invalid procedure call or argument"); return Value::str(s.substr(0, u16ToByte(s,(size_t)n))); };
    B["right"]  = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::string s=S(a,0); long n=(long)N(a,1); if(n<0) raiseErr(5, "Invalid procedure call or argument"); size_t tot=u16Length(s); if((size_t)n>=tot) return Value::str(s); return Value::str(s.substr(u16ToByte(s, tot-(size_t)n))); };
    B["mid"]    = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::string s=S(a,0); long st=(long)N(a,1); if(st<1) raiseErr(5, "Invalid procedure call or argument");
        size_t tot=u16Length(s); if((size_t)st>tot) return Value::str("");
        if(has(a,2) && (long long)N(a,2) < 0) raiseErr(5, "Invalid procedure call or argument");
        size_t off=u16ToByte(s,(size_t)st-1);
        size_t end = has(a,2)? u16ToByte(s,(size_t)st-1+(size_t)(long long)N(a,2)) : s.size();
        return Value::str(s.substr(off, end-off)); };
    B["ucase"]  = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); return Value::str(upper(S(a,0))); };
    // ---- the byte-oriented family -----------------------------------------
    // These report on the UTF-16 representation VBScript keeps, where every code
    // unit is two bytes. Directive stores UTF-8, so LenB, AscB and InStrB are
    // translated exactly, while LeftB/MidB/RightB accept only even byte counts:
    // half of a character cannot be held in a UTF-8 string. ChrB is deliberately
    // absent for the same reason -- it returns a single raw byte, which is not a
    // representable string here.
    B["lenb"]   = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); return Value::integer((int32_t)(2*u16Length(S(a,0)))); };
    B["ascb"]   = [=](Interpreter&, std::vector<Value>& a){ std::string t=S(a,0); if(t.empty()) raiseErr(5,"Invalid procedure call"); return Value::byteVal((unsigned char)(utf8First(t)&0xFF)); };
    B["leftb"]  = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::string t=S(a,0); long n=(long)N(a,1);
        if(n<0) raiseErr(5,"Invalid procedure call or argument");
        if(n%2) raiseErr(5,"LeftB: an odd byte count would split a character");
        return Value::str(t.substr(0,u16ToByte(t,(size_t)n/2))); };
    B["rightb"] = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::string t=S(a,0); long n=(long)N(a,1);
        if(n<0) raiseErr(5,"Invalid procedure call or argument");
        if(n%2) raiseErr(5,"RightB: an odd byte count would split a character");
        size_t tot=u16Length(t), take=(size_t)n/2;
        if(take>=tot) return Value::str(t);
        return Value::str(t.substr(u16ToByte(t,tot-take))); };
    B["midb"]   = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::string t=S(a,0); long st=(long)N(a,1);
        if(st<1||st%2==0) raiseErr(5,"MidB: start must be an odd byte position");
        size_t off=u16ToByte(t,(size_t)(st-1)/2);
        if(!has(a,2)) return Value::str(t.substr(off));
        long ln=(long)N(a,2);
        if(ln<0) raiseErr(5,"Invalid procedure call or argument");
        if(ln%2) raiseErr(5,"MidB: an odd byte count would split a character");
        size_t end=u16ToByte(t,(size_t)(st-1)/2+(size_t)ln/2);
        return Value::str(t.substr(off,end-off)); };
    B["instrb"] = [=](Interpreter&, std::vector<Value>& a){
        std::vector<Value> f=a; long start=1;
        bool three = f.size()>=3;
        if(three && f[0].isNull()) raiseErr(94,"Invalid use of Null");
        size_t i1=three?1:0, i2=three?2:1;
        if(f.size()>i1 && f[i1].isNull()) return Value::null();
        if(f.size()>i2 && f[i2].isNull()) return Value::null();
        std::string s1,s2;
        if(three && f[0].looksNumeric()){ start=(long)f[0].toI64(); s1=f[1].toStr(); s2=f[2].toStr(); }
        else { s1=S(f,0); s2=S(f,1); }
        if(start<1) raiseErr(5,"Invalid procedure call or argument");
        long cstart=(start+1)/2;                     // byte position -> character
        if((size_t)(cstart-1)>u16Length(s1)) return Value::integer(0);
        size_t pos=s1.find(s2,u16ToByte(s1,(size_t)cstart-1));
        if(pos==std::string::npos) return Value::integer(0);
        return Value::integer((int32_t)(2*byteToU16(s1,pos)+1)); };   // -> byte position
    B["lcase"]  = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); return Value::str(lower(S(a,0))); };
    B["trim"]   = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::string s=S(a,0); size_t b=s.find_first_not_of(" "); if(b==std::string::npos)return Value::str(""); size_t e=s.find_last_not_of(" "); return Value::str(s.substr(b,e-b+1)); };
    B["ltrim"]  = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::string s=S(a,0); size_t b=s.find_first_not_of(" "); return Value::str(b==std::string::npos?"":s.substr(b)); };
    B["rtrim"]  = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::string s=S(a,0); size_t e=s.find_last_not_of(" "); return Value::str(e==std::string::npos?"":s.substr(0,e+1)); };
    B["space"]  = [=](Interpreter&, std::vector<Value>& a){ long n=(long)N(a,0); if(n<0) raiseErr(5, "Invalid procedure call or argument"); return Value::str(std::string(n,' ')); };
    B["string"] = [=](Interpreter&, std::vector<Value>& a){ long n=(long)N(a,0); if(n<0) raiseErr(5, "Invalid procedure call or argument"); char c;
        if(a.size()>1&&a[1].type==Value::Type::String){ if(a[1].s.empty()) raiseErr(5, "Invalid procedure call or argument"); c=a[1].s[0]; } else c=(char)N(a,1); return Value::str(std::string(n,c)); };
    B["strreverse"]=[=](Interpreter&, std::vector<Value>& a){ std::string s=S(a,0); std::string o;
        o.reserve(s.size());                       // reverse characters, not bytes
        for(size_t i=s.size(); i>0; ){ size_t j=i-1; while(j>0 && ((unsigned char)s[j]&0xC0)==0x80) --j; o.append(s,j,i-j); i=j; }
        return Value::str(o); };
    B["instr"]  = [=](Interpreter&, std::vector<Value>& a){
        long start=1; std::string s1,s2;
        bool three = a.size()>=3;
        // A Null start is an error; a Null string yields Null.
        if(three && a[0].isNull()) raiseErr(94,"Invalid use of Null");
        size_t i1 = three?1:0, i2 = three?2:1;
        if(a.size()>i1 && a[i1].isNull()) return Value::null();
        if(a.size()>i2 && a[i2].isNull()) return Value::null();
        if(three && a[0].looksNumeric()){ start=(long)a[0].toI64(); s1=a[1].toStr(); s2=a[2].toStr(); }
        else { s1=S(a,0); s2=S(a,1); }
        if(start<1) raiseErr(5, "Invalid procedure call or argument");
        if((size_t)(start-1)>u16Length(s1)) return Value::integer(0);
        size_t pos=s1.find(s2, u16ToByte(s1,(size_t)start-1));
        return Value::integer(pos==std::string::npos?0:(int32_t)(byteToU16(s1,pos)+1)); };
    B["instrrev"]=[=](Interpreter&, std::vector<Value>& a){ for(auto& q:a) if(q.isNull()) return Value::null();
        std::string s1=S(a,0),s2=S(a,1); long start=has(a,2)?(long)N(a,2):-1;
        if(start==0 || start<-1) raiseErr(5, "Invalid procedure call or argument");
        size_t from = start<0? std::string::npos : u16ToByte(s1,(size_t)start-1);
        size_t pos=s1.rfind(s2, from);
        return Value::integer(pos==std::string::npos?0:(int32_t)(byteToU16(s1,pos)+1)); };
    B["replace"]=[=](Interpreter&, std::vector<Value>& a){
        std::string s=S(a,0),find=S(a,1),rep=S(a,2); if(find.empty()) return Value::str(s);
        long start = has(a,3)?(long)N(a,3):1; long count = has(a,4)?(long)N(a,4):-1;
        if(start<1) raiseErr(5, "Invalid procedure call or argument");
        std::string head = s.substr(0, std::min((size_t)start-1, s.size()));
        std::string body = s.substr(std::min((size_t)start-1, s.size()));
        std::string out; size_t pos=0; long done=0;
        while(true){ size_t f=body.find(find,pos); if(f==std::string::npos||(count>=0&&done>=count)){ out+=body.substr(pos); break;} out+=body.substr(pos,f-pos)+rep; pos=f+find.size(); done++; }
        return Value::str(head+out); };
    B["split"]  = [=](Interpreter&, std::vector<Value>& a){
        std::string s=S(a,0); std::string delim = has(a,1)?S(a,1):" ";
        long count = has(a,2) ? (long)N(a,2) : -1;      // max number of substrings (-1 = all)
        int cmp = has(a,3) ? (int)N(a,3) : 0;            // 0 binary, 1 text (case-insensitive)
        std::vector<Value> parts;
        if(count==0) return makeArray(parts);            // count 0 -> empty array
        if(s.empty()) return makeArray(parts);           // VBScript: Split("") -> empty array, UBound -1
        if(delim.empty()){ parts.push_back(Value::str(s)); return makeArray(parts); }
        std::string hay = (cmp==1) ? lower(s) : s;
        std::string ndl = (cmp==1) ? lower(delim) : delim;
        size_t pos=0,f;
        while((f=hay.find(ndl,pos))!=std::string::npos){
            if(count>0 && (long)parts.size()==count-1) break;   // limit reached; remainder is final element
            parts.push_back(Value::str(s.substr(pos,f-pos))); pos=f+delim.size();
        }
        parts.push_back(Value::str(s.substr(pos))); return makeArray(parts); };
    B["join"]   = [=](Interpreter&, std::vector<Value>& a){
        if(a.empty()||!a[0].isArray()) raiseErr(13,"Type mismatch (Join expects an array)");
        std::string delim = has(a,1)?S(a,1):" "; std::string out;
        auto& d=a[0].arr->data;
        for(size_t k=0;k<d.size();++k){ if(d[k].isNull()) raiseErr(13,"Type mismatch"); if(k)out+=delim; out+=d[k].toConcatStr(); }
        return Value::str(out); };
    B["strcomp"]=[=](Interpreter&, std::vector<Value>& a){ for(auto& q:a) if(q.isNull()) return Value::null(); std::string s1=S(a,0),s2=S(a,1); bool ci=(a.size()>2&&a[2].toI64()==1); if(ci){s1=lower(s1);s2=lower(s2);} int c=s1.compare(s2); return Value::int16((int16_t)(c<0?-1:(c>0?1:0))); };
    // Chr takes an ANSI code 0-255 and widens it; ChrW takes a UTF-16 code unit.
    // Both emit UTF-8, so Chr(233) is a real e-acute and ChrW(8364) a real euro
    // sign rather than a stray byte.
    B["chr"]    = [=](Interpreter&, std::vector<Value>& a){
        long n=(long)N(a,0);                       // Null falls through to error 94
        if(n<0||n>255) raiseErr(5,"Invalid procedure call or argument");  // ANSI only
        unsigned long cp=(unsigned long)n;
        if(n>=0x80&&n<=0x9F) cp=kCp1252High[n-0x80];
        return Value::str(utf8Encode(cp)); };
    B["chrw"]   = [=](Interpreter&, std::vector<Value>& a){
        long n=(long)N(a,0);
        if(n<0) n += 65536;
        if(n<0||n>65535) raiseErr(5,"Invalid procedure call or argument");
        return Value::str(utf8Encode((unsigned long)n)); };
    // Asc reports the ANSI code of the first character, AscW its UTF-16 code unit.
    B["asc"]    = [=](Interpreter&, std::vector<Value>& a){
        std::string t=S(a,0); if(t.empty()) raiseErr(5,"Invalid procedure call");
        unsigned long cp=utf8First(t);
        if(cp<0x80) return Value::int16((int16_t)cp);
        for(int i=0;i<32;++i) if(kCp1252High[i]==cp) return Value::int16((int16_t)(0x80+i));
        if(cp<=0xFF) return Value::int16((int16_t)cp);
        return Value::int16(63); };            // '?', as an unmappable character
    B["ascw"]   = [=](Interpreter&, std::vector<Value>& a){
        std::string t=S(a,0); if(t.empty()) raiseErr(5,"Invalid procedure call");
        unsigned long cp=utf8First(t);
        if(cp>0xFFFF) cp=0xD800+((cp-0x10000)>>10);   // high surrogate, as UTF-16 would
        return Value::int16((int16_t)(unsigned short)cp); };

    // ---- conversion ----
    B["cint"]   = [=](Interpreter&, std::vector<Value>& a){ double r=roundHalfEven(D(a,0)); if(r< -32768||r>32767) raiseErr(6,"Overflow"); return Value::int16((int16_t)r); };
    B["clnglng"]= [=](Interpreter&, std::vector<Value>& a){
        // A Directive extension: exact 64-bit integers, which VBScript cannot hold.
        // Parse the string form directly so digits beyond 2^53 survive.
        if(!a.empty() && a[0].type==Value::Type::String){
            const char* ws=" \t\r\n\f\v"; size_t b0=a[0].s.find_first_not_of(ws);
            if(b0!=std::string::npos){
                size_t e0=a[0].s.find_last_not_of(ws);
                std::string core=a[0].s.substr(b0,e0-b0+1);
                if(core.find_first_of(".eE")==std::string::npos){
                    try { return Value::big(std::stoll(core)); }
                    catch(const std::out_of_range&) { raiseErr(6,"Overflow"); }
                    catch(...) { raiseErr(13,"Type mismatch"); }
                }
            }
        }
        if(!a.empty() && a[0].type==Value::Type::Int64) return Value::big(a[0].i64);
        double r=roundHalfEven(D(a,0));
        if(!(r>=-9223372036854775808.0 && r<9223372036854775808.0)) raiseErr(6,"Overflow");
        return Value::big((long long)r); };
    B["clng"]   = [=](Interpreter&, std::vector<Value>& a){ double r=roundHalfEven(D(a,0)); if(r<INT32_MIN||r>INT32_MAX) raiseErr(6,"Overflow"); return Value::integer((int32_t)r); };
    B["cbyte"]  = [=](Interpreter&, std::vector<Value>& a){ double r=roundHalfEven(D(a,0)); if(r<0||r>255) raiseErr(6,"Overflow"); return Value::byteVal((unsigned char)r); };
    B["cdbl"]   = [=](Interpreter&, std::vector<Value>& a){ return Value::number(D(a,0)); };
    B["csng"]   = [=](Interpreter&, std::vector<Value>& a){ return Value::sng(D(a,0)); };
    B["cstr"]   = [=](Interpreter&, std::vector<Value>& a){ return Value::str(S(a,0)); };
    B["cbool"]  = [=](Interpreter&, std::vector<Value>& a){ return Value::boolean(a.empty()?false:a[0].toBool()); };
    B["cdate"]  = [=](Interpreter&, std::vector<Value>& a){ if(a.empty())raiseErr(13,"Type mismatch"); if(a[0].isDate())return a[0]; if(a[0].looksNumeric())return Value::date(a[0].toDouble()); double o; if(parseDateToSerial(a[0].toStr(),o))return Value::date(o); raiseErr(13,"Type mismatch"); };
    B["int"]    = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); if(!a.empty()&&(a[0].type==Value::Type::Int||a[0].type==Value::Type::Int64))return a[0]; return Value::number(std::floor(D(a,0))); };
    B["fix"]    = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); if(!a.empty()&&(a[0].type==Value::Type::Int||a[0].type==Value::Type::Int64))return a[0]; return Value::number(std::trunc(D(a,0))); };
    B["round"]  = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].type==Value::Type::Int64&&(!has(a,1)||N(a,1)>=0))return a[0]; double v=D(a,0); int dg=has(a,1)?(int)N(a,1):0; double f=std::pow(10,dg); double r=roundHalfEven(v*f)/f; return Value::number(r); };
    B["abs"]    = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null();
        if(!a.empty()&&a[0].type==Value::Type::Int64){ long long v=a[0].i64; if(v!=INT64_MIN) return Value::big(v<0?-v:v); } return Value::number(std::fabs(D(a,0))); };
    B["sgn"]    = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); double v=D(a,0); return Value::int16((int16_t)(v>0?1:(v<0?-1:0))); };
    B["sqr"]    = [=](Interpreter&, std::vector<Value>& a){ double v=D(a,0); if(v<0)raiseErr(5,"Invalid procedure call (Sqr of negative)"); return Value::number(std::sqrt(v)); };
    // Width follows the argument's subtype, like VBScript: Hex(-1) is FFFF for an
    // Integer but FFFFFFFF for a Long.
    B["hex"]    = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::ostringstream o; o<<std::uppercase<<std::hex<<intWidthOf(a); return Value::str(o.str()); };
    B["oct"]    = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); std::ostringstream o; o<<std::oct<<intWidthOf(a); return Value::str(o.str()); };

    // ---- type info ----
    B["isnumeric"]=[=](Interpreter&, std::vector<Value>& a){ return Value::boolean(!a.empty()&&a[0].looksNumeric()); };
    B["isempty"] =[=](Interpreter&, std::vector<Value>& a){ return Value::boolean(!a.empty()&&a[0].isEmpty()); };
    B["isnull"]  =[=](Interpreter&, std::vector<Value>& a){ return Value::boolean(!a.empty()&&a[0].isNull()); };
    B["isarray"] =[=](Interpreter&, std::vector<Value>& a){ return Value::boolean(!a.empty()&&a[0].isArray()); };
    B["isobject"]=[=](Interpreter&, std::vector<Value>& a){ return Value::boolean(!a.empty()&&a[0].isObject()); };
    B["isdate"]  =[=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isDate())return Value::boolean(true); if(a.empty()||a[0].type!=Value::Type::String)return Value::boolean(false); double o; return Value::boolean(parseDateToSerial(a[0].s,o)); };
    B["vartype"] =[=](Interpreter&, std::vector<Value>& a){ return Value::int16((int16_t)(a.empty()?0:a[0].varType())); };
    B["typename"]=[=](Interpreter&, std::vector<Value>& a){ return Value::str(a.empty()?"Empty":a[0].typeNameStr()); };

    // ---- arrays ----
    B["array"]  = [=](Interpreter&, std::vector<Value>& a){ return makeArray(a); };
    B["ubound"] = [=](Interpreter&, std::vector<Value>& a){ if(a.empty()||!a[0].isArray())raiseErr(13,"Type mismatch"); int dim=has(a,1)?(int)N(a,1):1; if(dim<1||dim>(int)a[0].arr->uppers.size())raiseErr(9,"Subscript out of range"); return Value::integer(a[0].arr->uppers[dim-1]); };
    B["lbound"] = [=](Interpreter&, std::vector<Value>& a){ if(a.empty()||!a[0].isArray())raiseErr(13,"Type mismatch"); return Value::integer(0); };
    B["filter"] = [=](Interpreter&, std::vector<Value>& a){ if(a.empty()||!a[0].isArray())raiseErr(13,"Type mismatch"); std::string m=S(a,1); bool inc=has(a,2)?a[2].toBool():true; std::vector<Value> out; for(auto&e:a[0].arr->data){ bool found=e.toStr().find(m)!=std::string::npos; if(found==inc)out.push_back(e);} return makeArray(out); };

    // ---- math ----
    B["rnd"]    = [=](Interpreter&, std::vector<Value>&){ return Value::number((double)std::rand()/((double)RAND_MAX+1.0)); };
    B["randomize"]=[=](Interpreter&, std::vector<Value>& a){ std::srand(a.empty()?(unsigned)std::time(nullptr):(unsigned)N(a,0)); return Value::empty(); };
    B["sin"]=[=](Interpreter&, std::vector<Value>& a){ return Value::number(std::sin(D(a,0))); };
    B["cos"]=[=](Interpreter&, std::vector<Value>& a){ return Value::number(std::cos(D(a,0))); };
    B["tan"]=[=](Interpreter&, std::vector<Value>& a){ return Value::number(std::tan(D(a,0))); };
    B["atn"]=[=](Interpreter&, std::vector<Value>& a){ return Value::number(std::atan(D(a,0))); };
    B["log"]=[=](Interpreter&, std::vector<Value>& a){ double x=D(a,0); if(!(x>0)) raiseErr(5, "Invalid procedure call or argument"); return Value::number(std::log(x)); };
    B["exp"]=[=](Interpreter&, std::vector<Value>& a){ return Value::number(std::exp(D(a,0))); };

    // ---- date / time ----
    auto nowSerial=[](){ std::time_t tt=std::time(nullptr); std::tm lt=*std::localtime(&tt); return serialFromYMDHMS(lt.tm_year+1900,lt.tm_mon+1,lt.tm_mday,lt.tm_hour,lt.tm_min,lt.tm_sec); };
    B["now"]  = [=](Interpreter&, std::vector<Value>&){ return Value::date(nowSerial()); };
    B["date"] = [=](Interpreter&, std::vector<Value>&){ return Value::date(std::floor(nowSerial())); };
    B["time"] = [=](Interpreter&, std::vector<Value>&){ double s=nowSerial(); return Value::date(s-std::floor(s)); };
    B["timer"]= [=](Interpreter&, std::vector<Value>&){ double s=nowSerial(); return Value::sng((s-std::floor(s))*86400.0); };   // VBScript returns a Single
    B["year"]  =[=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); int y,mo,d,h,mi,se; ymdhmsFromSerial(D(a,0),y,mo,d,h,mi,se); return Value::int16((int16_t)y); };
    B["month"] =[=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); int y,mo,d,h,mi,se; ymdhmsFromSerial(D(a,0),y,mo,d,h,mi,se); return Value::int16((int16_t)mo); };
    B["day"]   =[=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); int y,mo,d,h,mi,se; ymdhmsFromSerial(D(a,0),y,mo,d,h,mi,se); return Value::int16((int16_t)d); };
    B["hour"]  =[=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); int y,mo,d,h,mi,se; ymdhmsFromSerial(D(a,0),y,mo,d,h,mi,se); return Value::int16((int16_t)h); };
    B["minute"]=[=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); int y,mo,d,h,mi,se; ymdhmsFromSerial(D(a,0),y,mo,d,h,mi,se); return Value::int16((int16_t)mi); };
    B["second"]=[=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); int y,mo,d,h,mi,se; ymdhmsFromSerial(D(a,0),y,mo,d,h,mi,se); return Value::int16((int16_t)se); };
    B["weekday"]=[=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); long dd=(long)std::floor(D(a,0))+kBaseDay; int dow=(int)(((dd%7)+7+4)%7); return Value::int16((int16_t)(dow+1)); };
    B["dateserial"]=[=](Interpreter&, std::vector<Value>& a){ return Value::date(serialFromYMDHMS((int)N(a,0),(int)N(a,1),(int)N(a,2),0,0,0)); };
    B["timeserial"]=[=](Interpreter&, std::vector<Value>& a){ return Value::date(serialFromYMDHMS(1899,12,30,(int)N(a,0),(int)N(a,1),(int)N(a,2))); };
    B["datevalue"]=[=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); double o; if(a.empty())raiseErr(13,"Type mismatch"); if(a[0].looksNumeric())o=a[0].toDouble(); else if(!parseDateToSerial(a[0].toStr(),o))raiseErr(13,"Type mismatch"); return Value::date(std::floor(o)); };   // date part only
    B["timevalue"]=[=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull())return Value::null(); double o; if(a.empty())raiseErr(13,"Type mismatch"); if(a[0].looksNumeric())o=a[0].toDouble(); else if(!parseDateToSerial(a[0].toStr(),o))raiseErr(13,"Type mismatch"); double f=o-std::floor(o); if(f<0)f+=1.0; return Value::date(f); };   // time-of-day fraction
    B["dateadd"]=[=](Interpreter&, std::vector<Value>& a){ std::string iv=lower(S(a,0)); double num=D(a,1); double ser=D(a,2); int y,mo,d,h,mi,se; ymdhmsFromSerial(ser,y,mo,d,h,mi,se);
        if(iv=="yyyy")y+=(int)num; else if(iv=="m"){int t=(mo-1)+(int)num; y+=t/12; mo=t%12+1; if(mo<1){mo+=12;y--;}} else if(iv=="d")ser+=num; else if(iv=="ww")ser+=num*7; else if(iv=="h")ser+=num/24.0; else if(iv=="n")ser+=num/1440.0; else if(iv=="s")ser+=num/86400.0; else raiseErr(5,"Invalid interval");
        if(iv=="yyyy"||iv=="m"){ return Value::date(serialFromYMDHMS(y,mo,d,h,mi,se)); }
        return Value::date(ser); };
    B["datediff"]=[=](Interpreter&, std::vector<Value>& a){ std::string iv=lower(S(a,0)); double s1=D(a,1),s2=D(a,2); double diff=s2-s1;
        if(iv=="d") return Value::integer((int32_t)std::floor(diff));
        if(iv=="ww") return Value::integer((int32_t)std::floor(diff/7));
        if(iv=="h") return Value::integer((int32_t)std::floor(diff*24));
        if(iv=="n") return Value::integer((int32_t)std::floor(diff*1440));
        if(iv=="s") return Value::integer((int32_t)std::floor(diff*86400));
        int y1,y2,mo1,mo2,d,h,mi,se; ymdhmsFromSerial(s1,y1,mo1,d,h,mi,se); ymdhmsFromSerial(s2,y2,mo2,d,h,mi,se); if(iv=="yyyy")return Value::integer(y2-y1); if(iv=="m")return Value::integer((y2-y1)*12+(mo2-mo1)); raiseErr(5,"Invalid interval"); };
    B["formatdatetime"]=[=](Interpreter&, std::vector<Value>& a){ int y,mo,d,h,mi,se; double ser=D(a,0); ymdhmsFromSerial(ser,y,mo,d,h,mi,se); int fmt=has(a,1)?(int)N(a,1):0;
        if(fmt==1) return Value::str(osFormatDateLong(y,mo,d));     // dsLongDate
        if(fmt==2) return Value::str(osFormatDate(y,mo,d));          // dsShortDate
        if(fmt==3) return Value::str(osFormatTime(h,mi,se));         // dsLongTime
        if(fmt==4) return Value::str(osFormatTimeShort(h,mi));       // dsShortTime, no seconds
        return Value::str(dateToDisplayString(ser)); };              // dsGeneralDate

    // ---- misc / IO ----
    B["msgbox"]  = [=](Interpreter&, std::vector<Value>& a){ long flags = has(a,1)?(long)N(a,1):0; std::string title = has(a,2)?S(a,2):""; return Value::integer((int32_t)ui::msgBox(S(a,0), flags, title)); };
    B["inputbox"]= [=](Interpreter&, std::vector<Value>& a){ std::string title = has(a,1)?S(a,1):""; std::string def = has(a,2)?S(a,2):""; std::string out; if(ui::inputBox(S(a,0), title, def, out)) return Value::str(out); return Value::str(""); };
    B["createobject"]=[=](Interpreter& I, std::vector<Value>& a){ return I.createObjectByName(S(a,0)); };
    B["getobject"]=[=](Interpreter&, std::vector<Value>& a){ raiseErr(429,"GetObject is not supported in this build: "+S(a,0)); return Value::empty(); };
    B["execute"]       = [=](Interpreter& I, std::vector<Value>& a){ I.executeString(S(a,0), false); return Value::empty(); };
    B["executeglobal"] = [=](Interpreter& I, std::vector<Value>& a){ I.executeString(S(a,0), true);  return Value::empty(); };
    B["rgb"]     = [=](Interpreter&, std::vector<Value>& a){ long r=N(a,0)&0xFF,g=N(a,1)&0xFF,b=N(a,2)&0xFF; return Value::integer((int32_t)(r | (g<<8) | (b<<16))); };

    // ---- added for Directive parity ----
    B["eval"]    = [=](Interpreter& I, std::vector<Value>& a){ return I.evalExpression(S(a,0)); };
    B["getref"]  = [=](Interpreter& I, std::vector<Value>& a){ return I.makeFuncRef(S(a,0)); };
    B["erase"]   = [=](Interpreter&, std::vector<Value>&){ raiseErr(1, "Erase must be used as a statement: Erase arrayVar"); return Value::empty(); };
    B["monthname"] = [=](Interpreter&, std::vector<Value>& a){ long n=N(a,0); if(n<1||n>12) raiseErr(5,"Invalid procedure call"); bool ab=a.size()>1&&a[1].toBool(); return Value::str(osMonthName((int)n, ab)); };
    B["weekdayname"] = [=](Interpreter&, std::vector<Value>& a){ long n=N(a,0); bool ab=a.size()>1&&a[1].toBool(); long fd=a.size()>2?N(a,2):1; if(fd<1)fd=1; long idx=((n-1)+(fd-1))%7; if(idx<0)idx+=7; return Value::str(osDayName((int)idx, ab)); };
    B["formatnumber"]  = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull()) raiseErr(13,"Type mismatch"); int dg=has(a,1)?(int)N(a,1):2; bool grp=has(a,4)?a[4].toBool():true; return Value::str(localizeGrouped(fmtGrouped(D(a,0),dg,grp))); };
    B["formatpercent"] = [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull()) raiseErr(13,"Type mismatch"); int dg=has(a,1)?(int)N(a,1):2; bool grp=has(a,4)?a[4].toBool():true; return Value::str(localizeGrouped(fmtGrouped(D(a,0)*100.0,dg,grp))+"%"); };
    B["formatcurrency"]= [=](Interpreter&, std::vector<Value>& a){ if(!a.empty()&&a[0].isNull()) raiseErr(13,"Type mismatch"); int dg=has(a,1)?(int)N(a,1):2; bool grp=has(a,4)?a[4].toBool():true; double v=D(a,0); std::string s=localeCurrency(localizeGrouped(fmtGrouped(std::fabs(v),dg,grp))); return Value::str(v<0?("("+s+")"):s); };
    B["datepart"] = [=](Interpreter&, std::vector<Value>& a){ std::string iv=lower(S(a,0)); double ser=D(a,1); int y,mo,d,h,mi,se; ymdhmsFromSerial(ser,y,mo,d,h,mi,se);
        if(iv=="yyyy") return Value::int16((int16_t)y);
        if(iv=="m")    return Value::int16((int16_t)mo);
        if(iv=="d")    return Value::int16((int16_t)d);
        if(iv=="h")    return Value::int16((int16_t)h);
        if(iv=="n")    return Value::int16((int16_t)mi);
        if(iv=="s")    return Value::int16((int16_t)se);
        if(iv=="q")    return Value::int16((int16_t)(mo-1)/3+1);
        if(iv=="w"){ long dd=(long)std::floor(ser)+kBaseDay; int dow=(int)(((dd%7)+7+4)%7); return Value::int16((int16_t)dow+1); }
        if(iv=="y"){ double jan1=serialFromYMDHMS(y,1,1,0,0,0); return Value::int16((int16_t)(int)(std::floor(ser)-std::floor(jan1))+1); }
        if(iv=="ww"){ double jan1=serialFromYMDHMS(y,1,1,0,0,0); return Value::int16((int16_t)(int)((std::floor(ser)-std::floor(jan1))/7)+1); }
        raiseErr(5,"Invalid interval"); return Value::empty(); };
    B["ccur"]    = [=](Interpreter&, std::vector<Value>& a){ return Value::number(D(a,0)); };
    B["scriptengine"] = [=](Interpreter&, std::vector<Value>&){ return Value::str("Directive"); };
    B["scriptenginemajorversion"] = [=](Interpreter&, std::vector<Value>&){ return Value::integer(1); };
    B["scriptengineminorversion"] = [=](Interpreter&, std::vector<Value>&){ return Value::integer(0); };
    B["scriptenginebuildversion"] = [=](Interpreter&, std::vector<Value>&){ return Value::integer(1); };
    B["getlocale"] = [=](Interpreter&, std::vector<Value>&){ return Value::integer((int32_t)g_loc.lcid); };
    B["setlocale"] = [=](Interpreter&, std::vector<Value>& a){
        int prev = g_loc.lcid;
        // SetLocale(0) restores the OS default, as VBScript does.
        localeApply(a.empty() ? 0 : (int)a[0].toI64());
        return Value::integer((int32_t)prev); };
    // Clipboard is now the `New Clipboard` object (Get/Set/Clear); the old flat
    // ClipPut/ClipGet functions were removed in favor of that object.
}

// =============================================================== COM / ActiveX
#ifdef _WIN32
#include <windows.h>
#include <oleauto.h>
#include <mmsystem.h>    // PlaySound / SND_* (link winmm)
#include <shlobj.h>      // SHGetFolderPath / CSIDL_* for Shell.SpecialFolders (link shell32)

static std::wstring utf8ToWide(const std::string& s) {
    if (s.empty()) return std::wstring();
    int n = MultiByteToWideChar(CP_UTF8, 0, s.data(), (int)s.size(), nullptr, 0);
    std::wstring w(n, 0);
    MultiByteToWideChar(CP_UTF8, 0, s.data(), (int)s.size(), &w[0], n);
    return w;
}
static std::string wideToUtf8(const wchar_t* w, int len) {
    if (!w || len == 0) return std::string();
    int n = WideCharToMultiByte(CP_UTF8, 0, w, len, nullptr, 0, nullptr, nullptr);
    std::string s(n, 0);
    WideCharToMultiByte(CP_UTF8, 0, w, len, &s[0], n, nullptr, nullptr);
    return s;
}

struct ComObject : IObject {
    IDispatch* disp = nullptr;
    // Thin accessor objects (Illustrator's CharacterAttributes, etc.) are only
    // valid while the object they came from is alive. Holding the parent here makes
    // that structural, so it survives across statements -- the per-statement
    // comAnchors could not, e.g. Set ca = txt.TextRange.CharacterAttributes
    // followed by ca.Size = 12 on the next line.
    std::shared_ptr<IObject> parentRef;
    explicit ComObject(IDispatch* d) : disp(d) { if (disp) disp->AddRef(); }
    ~ComObject() override { if (disp) disp->Release(); }

    bool isComRef() const override { return true; }

    std::string typeName() const override {
        if (!disp) return "Object";
        // VBScript reports the COCLASS name -- "FileSystemObject" -- whereas
        // GetTypeInfo hands back the interface, "IFileSystem3". Ask the object for
        // its class info first and only fall back to the interface name.
        IProvideClassInfo* pci = nullptr;
        if (SUCCEEDED(disp->QueryInterface(IID_IProvideClassInfo, (void**)&pci)) && pci) {
            std::string cls;
            ITypeInfo* cti = nullptr;
            if (SUCCEEDED(pci->GetClassInfo(&cti)) && cti) {
                BSTR nm = nullptr;
                if (SUCCEEDED(cti->GetDocumentation(MEMBERID_NIL, &nm, nullptr, nullptr, nullptr)) && nm) {
                    cls = wideToUtf8(nm, (int)SysStringLen(nm));
                    SysFreeString(nm);
                }
                cti->Release();
            }
            pci->Release();
            if (!cls.empty()) return cls;
        }
        // Fall back to the interface name, e.g. ITextRange -> TextRange.
        ITypeInfo* ti = nullptr;
        if (SUCCEEDED(disp->GetTypeInfo(0, LOCALE_USER_DEFAULT, &ti)) && ti) {
            BSTR name = nullptr;
            HRESULT hr = ti->GetDocumentation(MEMBERID_NIL, &name, nullptr, nullptr, nullptr);
            std::string result = "Object";
            if (SUCCEEDED(hr) && name) {
                result = wideToUtf8(name, (int)SysStringLen(name));
                SysFreeString(name);
                // strip a leading interface "I" (e.g. ITextRange -> TextRange) when it looks like one
                if (result.size() > 2 && result[0] == 'I' && isupper((unsigned char)result[1])) result.erase(0, 1);
            }
            ti->Release();
            return result;
        }
        return "Object";
    }

    // Give a freshly wrapped child a strong reference back to us.
    Value attachParent(Value rv) {
        if (!rv.isObject() || !rv.obj || rv.obj.get() == this) return rv;
        if (!rv.obj->isComRef()) return rv;
        auto child = std::static_pointer_cast<ComObject>(rv.obj);
        if (child->disp == disp) return rv;          // self-reference: would cycle
        if (auto self = weak_from_this().lock()) child->parentRef = self;
        return rv;
    }

    DISPID nameToId(const std::string& name) {
        if (name.empty()) return DISPID_VALUE;
        std::wstring w = utf8ToWide(name);
        LPOLESTR p = (LPOLESTR)w.c_str();
        DISPID id = 0;
        HRESULT hr = disp->GetIDsOfNames(IID_NULL, &p, 1, LOCALE_USER_DEFAULT, &id);
        if (FAILED(hr)) raiseErr(438, "Object doesn't support this property or method: " + name);
        return id;
    }

    // Convert a COM SAFEARRAY into a Directive array (0-based). Handles any number
    // of dimensions and either VARIANT elements or a scalar element type.
    static Value safeArrayToValue(SAFEARRAY* sa) {
        UINT cDims = SafeArrayGetDim(sa);
        if (cDims == 0) return Value::empty();
        VARTYPE et = VT_VARIANT;
        SafeArrayGetVartype(sa, &et);
        auto ad = std::make_shared<ArrayData>();
        ad->uppers.resize(cDims);
        std::vector<LONG> lb(cDims);
        for (UINT k = 0; k < cDims; ++k) {
            LONG l = 0, u = -1;
            SafeArrayGetLBound(sa, k + 1, &l);
            SafeArrayGetUBound(sa, k + 1, &u);
            lb[k] = l;
            ad->uppers[k] = (int)(u - l);            // Directive is 0-based; store count-1
        }
        ad->data.assign(ad->total(), Value::empty());
        size_t tot = ad->total();
        std::vector<LONG> lidx(cDims);
        std::vector<int> idx(cDims, 0);
        for (size_t f = 0; f < tot; ++f) {
            size_t rem = f;                          // flat -> per-dim index (row-major)
            for (size_t k = cDims; k-- > 0; ) { int ds = ad->uppers[k] + 1; idx[k] = (int)(rem % ds); rem /= ds; }
            for (UINT k = 0; k < cDims; ++k) lidx[k] = lb[k] + idx[k];
            VARIANT ev; VariantInit(&ev);
            if (et == VT_VARIANT) { SafeArrayGetElement(sa, lidx.data(), &ev); }
            else { ev.vt = et; SafeArrayGetElement(sa, lidx.data(), &ev.llVal); }  // union slot (little-endian Windows)
            ad->data[f] = variantToValue(ev);
            VariantClear(&ev);
        }
        return Value::array(ad);
    }

    static Value variantToValue(VARIANT& v) {
        if (v.vt & VT_ARRAY) {                       // SAFEARRAY (any element type / dims)
            SAFEARRAY* sa = (v.vt & VT_BYREF) ? (v.pparray ? *v.pparray : nullptr) : v.parray;
            return sa ? safeArrayToValue(sa) : Value::empty();
        }
        if (v.vt & VT_BYREF && v.vt != (VT_BYREF | VT_VARIANT)) {
            // dereference simple byref
        }
        switch (v.vt) {
            case VT_EMPTY: return Value::empty();
            case VT_NULL:  return Value::null();
            case VT_BOOL:  return Value::boolean(v.boolVal != VARIANT_FALSE);
            case VT_I1:    return Value::integer(v.cVal);
            case VT_UI1:   return Value::integer(v.bVal);
            case VT_I2:    return Value::integer(v.iVal);
            case VT_UI2:   return Value::integer(v.uiVal);
            case VT_I4:    return Value::integer(v.lVal);
            case VT_UI4:   return Value::number((double)v.ulVal);
            case VT_INT:   return Value::integer(v.intVal);
            case VT_UINT:  return Value::number((double)v.uintVal);
            case VT_I8:    return Value::number((double)v.llVal);
            case VT_UI8:   return Value::number((double)v.ullVal);
            case VT_R4:    return Value::number(v.fltVal);
            case VT_R8:    return Value::number(v.dblVal);
            case VT_DATE:  return Value::number(v.date);   // OLE date epoch == Directive serial
            case VT_BSTR:  return Value::str(wideToUtf8(v.bstrVal, v.bstrVal ? (int)SysStringLen(v.bstrVal) : 0));
            case VT_DISPATCH: return v.pdispVal ? Value::object(std::make_shared<ComObject>(v.pdispVal)) : Value::nothing();
            case VT_UNKNOWN: {
                if (!v.punkVal) return Value::nothing();
                IDispatch* d = nullptr;
                if (SUCCEEDED(v.punkVal->QueryInterface(IID_IDispatch, (void**)&d)) && d) {
                    Value r = Value::object(std::make_shared<ComObject>(d)); d->Release(); return r;
                }
                return Value::nothing();
            }
            case (VT_BYREF | VT_VARIANT): return v.pvarVal ? variantToValue(*v.pvarVal) : Value::empty();
            default: return Value::empty();   // SAFEARRAY / unsupported
        }
    }
    static void valueToVariant(const Value& val, VARIANT& out) {
        VariantInit(&out);
        switch (val.type) {
            case Value::Type::Empty:  out.vt = VT_EMPTY; break;
            case Value::Type::Null:   out.vt = VT_NULL; break;
            case Value::Type::Bool:   out.vt = VT_BOOL; out.boolVal = val.b ? VARIANT_TRUE : VARIANT_FALSE; break;
            case Value::Type::Int:    out.vt = VT_I4;   out.lVal = val.i; break;
            case Value::Type::Double: out.vt = VT_R8;   out.dblVal = val.d; break;
            case Value::Type::String: { std::wstring w = utf8ToWide(val.s); out.vt = VT_BSTR; out.bstrVal = SysAllocStringLen(w.data(), (UINT)w.size()); break; }
            case Value::Type::Object: {
                if (val.obj) { ComObject* c = dynamic_cast<ComObject*>(val.obj.get());
                               if (c && c->disp) { out.vt = VT_DISPATCH; out.pdispVal = c->disp; c->disp->AddRef(); break; } }
                out.vt = VT_DISPATCH; out.pdispVal = nullptr; break;   // Nothing / non-COM native
            }
            case Value::Type::Array: {
                // Build a SAFEARRAY of VARIANT (what VBScript passes). Handles any
                // number of dimensions; nested arrays recurse into nested SAFEARRAYs.
                if (!val.arr || val.arr->uppers.empty()) { out.vt = VT_EMPTY; break; }
                UINT cDims = (UINT)val.arr->uppers.size();
                std::vector<SAFEARRAYBOUND> bounds(cDims);
                for (UINT k = 0; k < cDims; ++k) { bounds[k].lLbound = 0; bounds[k].cElements = (ULONG)(val.arr->uppers[k] + 1); }
                SAFEARRAY* sa = SafeArrayCreate(VT_VARIANT, cDims, bounds.data());
                if (!sa) { out.vt = VT_EMPTY; break; }
                size_t tot = val.arr->total();
                std::vector<LONG> lidx(cDims);
                std::vector<int> idx(cDims, 0);
                for (size_t f = 0; f < tot; ++f) {
                    size_t rem = f;                  // flat -> per-dim index (row-major)
                    for (size_t k = cDims; k-- > 0; ) { int ds = val.arr->uppers[k] + 1; idx[k] = (int)(rem % ds); rem /= ds; }
                    for (UINT k = 0; k < cDims; ++k) lidx[k] = idx[k];
                    VARIANT elem; valueToVariant(val.arr->data[f], elem);
                    SafeArrayPutElement(sa, lidx.data(), &elem);   // copies the element
                    VariantClear(&elem);
                }
                out.vt = VT_ARRAY | VT_VARIANT;
                out.parray = sa;
                break;
            }
            default: out.vt = VT_EMPTY; break;
        }
    }

    Value invoke(DISPID id, WORD flags, std::vector<Value>& args, const Value* putVal) {
        std::vector<VARIANTARG> vargs;
        // positional args go in reverse order
        for (size_t k = args.size(); k-- > 0; ) { VARIANTARG va; valueToVariant(args[k], va); vargs.push_back(va); }
        DISPID putId = DISPID_PROPERTYPUT;
        DISPPARAMS dp; ZeroMemory(&dp, sizeof(dp));
        VARIANTARG putVar; VariantInit(&putVar);
        if (putVal) {
            valueToVariant(*putVal, putVar);
            // property value must be rgvarg[0]
            vargs.insert(vargs.begin(), putVar);
            dp.cNamedArgs = 1; dp.rgdispidNamedArgs = &putId;
        }
        dp.cArgs = (UINT)vargs.size();
        dp.rgvarg = vargs.empty() ? nullptr : vargs.data();

        VARIANT result; VariantInit(&result);
        EXCEPINFO ei; ZeroMemory(&ei, sizeof(ei));
        UINT argErr = 0;
        HRESULT hr = disp->Invoke(id, IID_NULL, LOCALE_USER_DEFAULT, flags, &dp, &result, &ei, &argErr);
        for (auto& va : vargs) VariantClear(&va);
        if (FAILED(hr)) {
            std::string desc = "COM Invoke failed";
            long num = (long)(hr & 0xFFFF);
            if (hr == DISP_E_EXCEPTION && ei.bstrDescription)
                desc = wideToUtf8(ei.bstrDescription, (int)SysStringLen(ei.bstrDescription));
            if (ei.bstrSource) SysFreeString(ei.bstrSource);
            if (ei.bstrDescription) SysFreeString(ei.bstrDescription);
            if (ei.bstrHelpFile) SysFreeString(ei.bstrHelpFile);
            raiseErr(num ? num : 440, desc);
        }
        Value rv = attachParent(variantToValue(result));
        VariantClear(&result);
        return rv;
    }

    Value get(Interpreter&, const std::string& name, std::vector<Value>& args) override {
        DISPID id = nameToId(name);
        return invoke(id, DISPATCH_METHOD | DISPATCH_PROPERTYGET, args, nullptr);
    }
    void set(Interpreter&, const std::string& name, std::vector<Value>& args, const Value& val, bool isSet) override {
        DISPID id = nameToId(name);
        invoke(id, isSet ? DISPATCH_PROPERTYPUTREF : DISPATCH_PROPERTYPUT, args, &val);
    }
    bool enumerate(Interpreter&, std::vector<Value>& out) override {
        DISPPARAMS dp; ZeroMemory(&dp, sizeof(dp));
        VARIANT res; VariantInit(&res);
        HRESULT hr = disp->Invoke(DISPID_NEWENUM, IID_NULL, LOCALE_USER_DEFAULT,
                                  DISPATCH_METHOD | DISPATCH_PROPERTYGET, &dp, &res, nullptr, nullptr);
        if (FAILED(hr)) return false;
        IEnumVARIANT* e = nullptr;
        IUnknown* unk = (res.vt == VT_UNKNOWN) ? res.punkVal : (res.vt == VT_DISPATCH ? (IUnknown*)res.pdispVal : nullptr);
        if (unk) unk->QueryInterface(IID_IEnumVARIANT, (void**)&e);
        VariantClear(&res);
        if (!e) return false;
        VARIANT item; VariantInit(&item); ULONG fetched = 0;
        while (e->Next(1, &item, &fetched) == S_OK && fetched == 1) { out.push_back(attachParent(variantToValue(item))); VariantClear(&item); }
        e->Release();
        return true;
    }
};

static ObjectPtr createComObject(const std::string& progid, bool& ok) {
    ok = false;
    std::wstring w = utf8ToWide(progid);
    CLSID clsid;
    HRESULT hr = CLSIDFromProgID(w.c_str(), &clsid);
    if (FAILED(hr)) return nullptr;
    IDispatch* disp = nullptr;
    hr = CoCreateInstance(clsid, nullptr, CLSCTX_INPROC_SERVER | CLSCTX_LOCAL_SERVER,
                          IID_IDispatch, (void**)&disp);
    if (FAILED(hr) || !disp) return nullptr;
    auto obj = std::make_shared<ComObject>(disp);
    disp->Release();   // ComObject holds its own ref
    ok = true;
    return obj;
}

// ---- Mouse automation (Windows) ----
struct MouseObject : IObject {
    static void button(const std::string& btn, bool down) {
        std::string b = btn.empty() ? "left" : toLower(btn);
        DWORD f = 0;
        if      (b == "left")   f = down ? MOUSEEVENTF_LEFTDOWN   : MOUSEEVENTF_LEFTUP;
        else if (b == "right")  f = down ? MOUSEEVENTF_RIGHTDOWN  : MOUSEEVENTF_RIGHTUP;
        else if (b == "middle") f = down ? MOUSEEVENTF_MIDDLEDOWN : MOUSEEVENTF_MIDDLEUP;
        else raiseErr(5, "Mouse: unknown button '" + btn + "' (use left/right/middle)");
        mouse_event(f, 0, 0, 0, 0);
    }
    std::string typeName() const override { return "Mouse"; }
    Value get(Interpreter&, const std::string& member, std::vector<Value>& args) override {
        std::string m = toLower(member);
        auto N = [&](size_t i)->long { return i < args.size() ? args[i].toInt() : 0; };
        if (m == "move") {
            long x = N(0), y = N(1), speed = args.size() > 2 ? args[2].toInt() : 0;
            if (speed <= 0) SetCursorPos((int)x, (int)y);
            else {
                POINT p; GetCursorPos(&p);
                int steps = (int)std::min<long>(std::max<long>(speed, 1) * 10, 400);
                for (int s = 1; s <= steps; ++s) {
                    SetCursorPos((int)(p.x + (x - p.x) * s / steps),
                                 (int)(p.y + (y - p.y) * s / steps));
                    Sleep(5);
                }
            }
            return Value::empty();
        }
        if (m == "click") {                              // Click([button],[x],[y],[count])
            std::string btn = !args.empty() ? args[0].toStr() : "left";
            if (args.size() >= 3) SetCursorPos((int)N(1), (int)N(2));
            long count = args.size() > 3 ? args[3].toInt() : 1;
            for (long i = 0; i < (count < 1 ? 1 : count); ++i) { button(btn, true); button(btn, false); }
            return Value::empty();
        }
        if (m == "down") { button(!args.empty() ? args[0].toStr() : "left", true);  return Value::empty(); }
        if (m == "up")   { button(!args.empty() ? args[0].toStr() : "left", false); return Value::empty(); }
        if (m == "wheel") {                              // Wheel("up"|"down",[clicks])
            std::string dir = !args.empty() ? toLower(args[0].toStr()) : "up";
            long clicks = args.size() > 1 ? args[1].toInt() : 1;
            int delta = (int)(WHEEL_DELTA * clicks) * (dir == "down" ? -1 : 1);
            mouse_event(MOUSEEVENTF_WHEEL, 0, 0, (DWORD)delta, 0);
            return Value::empty();
        }
        if (m == "x" || m == "y" || m == "getpos") {
            POINT p; GetCursorPos(&p);
            if (m == "x") return Value::integer(p.x);
            if (m == "y") return Value::integer(p.y);
            auto ad = std::make_shared<ArrayData>();     // GetPos -> [x, y]
            ad->uppers = { 1 };
            ad->data = { Value::integer(p.x), Value::integer(p.y) };
            return Value::array(ad);
        }
        raiseErr(438, "Mouse has no member '" + member + "'");
        return Value::empty();
    }
};

// ---- Screen: pixel color + metrics (Windows) ----
struct ScreenObject : IObject {
    std::string typeName() const override { return "Screen"; }
    Value get(Interpreter&, const std::string& member, std::vector<Value>& args) override {
        std::string m = toLower(member);
        if (m == "pixelcolor" || m == "getpixel") {
            if (args.size() < 2) raiseErr(5, "Screen.PixelColor requires x, y");
            HDC dc = GetDC(NULL);
            COLORREF c = GetPixel(dc, (int)args[0].toInt(), (int)args[1].toInt());
            ReleaseDC(NULL, dc);
            if (c == CLR_INVALID) raiseErr(5, "Screen.PixelColor: coordinates off-screen");
            long rgb = ((long)GetRValue(c) << 16) | ((long)GetGValue(c) << 8) | (long)GetBValue(c);
            return Value::integer((int32_t)rgb);         // 0xRRGGBB (like AutoIt PixelGetColor)
        }
        if (m == "width")  return Value::integer(GetSystemMetrics(SM_CXSCREEN));
        if (m == "height") return Value::integer(GetSystemMetrics(SM_CYSCREEN));
        raiseErr(438, "Screen has no member '" + member + "'");
        return Value::empty();
    }
};

// ---- Sound playback (Windows, via winmm PlaySound) ----
static bool soundPlay(const std::string& file, bool wait) {
    std::wstring w = utf8ToWide(file);
    BOOL ok = PlaySoundW(w.c_str(), NULL, SND_FILENAME | (wait ? SND_SYNC : SND_ASYNC));
    return ok ? true : false;
}
static void soundStop() { PlaySoundW(NULL, NULL, 0); }
static void soundBeep(int freq, int dur) { Beep((DWORD)freq, (DWORD)dur); }

static ObjectPtr makeMouseObj()  { return std::make_shared<MouseObject>(); }
static ObjectPtr makeScreenObj() { return std::make_shared<ScreenObject>(); }

// ---- Keyboard (Windows synthetic input; symmetric with Mouse) ----
// Send() understands the SendKeys mini-language: literal text, {NAMED} keys with
// optional repeat ({LEFT 5}), modifiers + ^ % (Shift/Ctrl/Alt) applied to the
// next key or a (grouped) run, ~ for Enter, and {+}{^}{%}{(}{)}{{}{}} literals.
struct KeyboardObject : IObject {
    std::string typeName() const override { return "Keyboard"; }

    static int namedVk(const std::string& nameRaw) {
        std::string n = nameRaw; for (auto& c : n) c = (char)tolower((unsigned char)c);
        if (n == "enter" || n == "return") return VK_RETURN;
        if (n == "tab")        return VK_TAB;
        if (n == "esc" || n == "escape") return VK_ESCAPE;
        if (n == "space")      return VK_SPACE;
        if (n == "backspace" || n == "bs" || n == "bksp") return VK_BACK;
        if (n == "delete" || n == "del") return VK_DELETE;
        if (n == "insert" || n == "ins") return VK_INSERT;
        if (n == "home")       return VK_HOME;
        if (n == "end")        return VK_END;
        if (n == "pgup" || n == "pageup")   return VK_PRIOR;
        if (n == "pgdn" || n == "pagedown") return VK_NEXT;
        if (n == "up")         return VK_UP;
        if (n == "down")       return VK_DOWN;
        if (n == "left")       return VK_LEFT;
        if (n == "right")      return VK_RIGHT;
        if (n == "capslock")   return VK_CAPITAL;
        if (n == "numlock")    return VK_NUMLOCK;
        if (n == "prtsc" || n == "printscreen") return VK_SNAPSHOT;
        if (n == "break")      return VK_CANCEL;
        if (n == "help")       return VK_HELP;
        if (n == "shift")      return VK_SHIFT;
        if (n == "ctrl" || n == "control") return VK_CONTROL;
        if (n == "alt" || n == "menu")     return VK_MENU;
        if (n.size() >= 2 && n[0] == 'f') {   // F1..F24
            int num = atoi(n.c_str() + 1);
            if (num >= 1 && num <= 24) return VK_F1 + (num - 1);
        }
        return -1;
    }
    static void tapVk(int vk, bool shift) {
        if (shift) keybd_event(VK_SHIFT, 0, 0, 0);
        keybd_event((BYTE)vk, 0, 0, 0);
        keybd_event((BYTE)vk, 0, KEYEVENTF_KEYUP, 0);
        if (shift) keybd_event(VK_SHIFT, 0, KEYEVENTF_KEYUP, 0);
    }
    static void tapChar(wchar_t ch) {
        SHORT s = VkKeyScanW(ch);
        if (s == -1) return;
        int vk = s & 0xFF;
        bool shift = (s & 0x100) != 0;
        tapVk(vk, shift);
    }
    // Resolve a key argument (a name like "ENTER"/"F5" or a single character) to a VK.
    static int resolveKey(const std::string& key, bool& shift) {
        shift = false;
        int vk = namedVk(key);
        if (vk >= 0) return vk;
        std::wstring w = utf8ToWide(key);
        if (w.size() == 1) { SHORT s = VkKeyScanW(w[0]); if (s != -1) { shift = (s & 0x100) != 0; return s & 0xFF; } }
        return -1;
    }
    void sendKeys(const std::string& spec) {
        std::wstring s = utf8ToWide(spec);
        size_t i = 0;
        while (i < s.size()) {
            int mods = 0;   // bit0 shift, bit1 ctrl, bit2 alt
            // collect leading modifiers
            while (i < s.size() && (s[i] == L'+' || s[i] == L'^' || s[i] == L'%')) {
                if (s[i] == L'+') mods |= 1; else if (s[i] == L'^') mods |= 2; else mods |= 4;
                ++i;
            }
            auto pressMods = [&](bool down){
                if (mods & 1) keybd_event(VK_SHIFT,   0, down ? 0 : KEYEVENTF_KEYUP, 0);
                if (mods & 2) keybd_event(VK_CONTROL, 0, down ? 0 : KEYEVENTF_KEYUP, 0);
                if (mods & 4) keybd_event(VK_MENU,    0, down ? 0 : KEYEVENTF_KEYUP, 0);
            };
            if (i >= s.size()) break;
            if (s[i] == L'~') { pressMods(true); tapVk(VK_RETURN, false); pressMods(false); ++i; continue; }
            if (s[i] == L'(') {                       // modifier applies to the whole group
                ++i; pressMods(true);
                while (i < s.size() && s[i] != L')') { emitToken(s, i); }
                if (i < s.size()) ++i;                // skip ')'
                pressMods(false); continue;
            }
            pressMods(true);
            emitToken(s, i);
            pressMods(false);
        }
    }
    // Emit one token starting at s[i]; advances i. A token is a {..} group or one char.
    void emitToken(const std::wstring& s, size_t& i) {
        if (s[i] == L'{') {
            size_t e = s.find(L'}', i + 1);
            if (e == std::wstring::npos) { tapChar(s[i]); ++i; return; }
            std::wstring inner = s.substr(i + 1, e - i - 1);
            i = e + 1;
            // {x N} repeat, or {KEYNAME}
            int repeat = 1; std::wstring keyname = inner;
            size_t sp = inner.find_last_of(L' ');
            if (sp != std::wstring::npos) {
                std::wstring num = inner.substr(sp + 1);
                bool allDigit = !num.empty();
                for (wchar_t d : num) if (!iswdigit(d)) { allDigit = false; break; }
                if (allDigit) { repeat = _wtoi(num.c_str()); keyname = inner.substr(0, sp); }
            }
            if (keyname.size() == 1) { for (int r = 0; r < repeat; ++r) tapChar(keyname[0]); return; }
            std::string kn(keyname.begin(), keyname.end());   // ASCII key names
            int vk = namedVk(kn);
            for (int r = 0; r < repeat; ++r) { if (vk >= 0) tapVk(vk, false); }
            return;
        }
        tapChar(s[i]); ++i;
    }

    Value get(Interpreter&, const std::string& member, std::vector<Value>& args) override {
        std::string m = toLower(member);
        if (m == "send" || m == "sendkeys") {
            if (args.empty()) raiseErr(5, "Keyboard.Send requires a string");
            bool raw = args.size() > 1 && args[1].toBool();   // AutoIt-style Send($keys, 1): literal, no {}/+^%() parsing
            if (raw) { std::wstring w = utf8ToWide(args[0].toStr()); for (wchar_t ch : w) tapChar(ch); }
            else sendKeys(args[0].toStr());
            return Value::empty();
        }
        if (m == "type") {                               // literal text, no SendKeys parsing
            if (args.empty()) raiseErr(5, "Keyboard.Type requires a string");
            std::wstring w = utf8ToWide(args[0].toStr());
            for (wchar_t ch : w) tapChar(ch);
            return Value::empty();
        }
        if (m == "down" || m == "up") {
            if (args.empty()) raiseErr(5, "Keyboard." + member + " requires a key");
            bool shift = false; int vk = resolveKey(args[0].toStr(), shift);
            if (vk < 0) raiseErr(5, "Keyboard: unknown key '" + args[0].toStr() + "'");
            keybd_event((BYTE)vk, 0, (m == "up") ? KEYEVENTF_KEYUP : 0, 0);
            return Value::empty();
        }
        raiseErr(438, "Keyboard has no member '" + member + "'");
        return Value::empty();
    }
};
static ObjectPtr makeKeyboardObj() { return std::make_shared<KeyboardObject>(); }

// ---- Clipboard (Windows, CF_UNICODETEXT) ----
static bool clipboardSet(const std::string& text) {
    if (!OpenClipboard(NULL)) return false;
    EmptyClipboard();
    std::wstring w = utf8ToWide(text);
    HGLOBAL h = GlobalAlloc(GMEM_MOVEABLE, (w.size() + 1) * sizeof(wchar_t));
    if (!h) { CloseClipboard(); return false; }
    wchar_t* dst = (wchar_t*)GlobalLock(h);
    if (!dst) { GlobalFree(h); CloseClipboard(); return false; }
    for (size_t i = 0; i < w.size(); ++i) dst[i] = w[i];
    dst[w.size()] = 0;
    GlobalUnlock(h);
    HANDLE r = SetClipboardData(CF_UNICODETEXT, h);   // clipboard takes ownership on success
    CloseClipboard();
    if (!r) { GlobalFree(h); return false; }
    return true;
}
static bool clipboardGet(std::string& out) {
    out.clear();
    if (!IsClipboardFormatAvailable(CF_UNICODETEXT)) return false;
    if (!OpenClipboard(NULL)) return false;
    HANDLE h = GetClipboardData(CF_UNICODETEXT);
    if (!h) { CloseClipboard(); return false; }
    const wchar_t* w = (const wchar_t*)GlobalLock(h);
    if (!w) { CloseClipboard(); return false; }
    int len = 0; while (w[len]) ++len;
    out = wideToUtf8(w, len);
    GlobalUnlock(h);
    CloseClipboard();
    return true;
}
static void clipboardClear() {
    if (OpenClipboard(NULL)) { EmptyClipboard(); CloseClipboard(); }
}

// ---- Clipboard object (Windows): Get / Set / Clear ----
struct ClipboardObject : IObject {
    std::string typeName() const override { return "Clipboard"; }
    Value get(Interpreter&, const std::string& member, std::vector<Value>& args) override {
        std::string m = toLower(member);
        if (m == "set" || m == "settext" || m == "puttext") {
            return Value::boolean(clipboardSet(args.empty() ? "" : args[0].toStr()));
        }
        if (m == "get" || m == "gettext") { std::string s; clipboardGet(s); return Value::str(s); }
        if (m == "clear") { clipboardClear(); return Value::empty(); }
        raiseErr(438, "Clipboard has no member '" + member + "'");
        return Value::empty();
    }
};
static ObjectPtr makeClipboardObj() { return std::make_shared<ClipboardObject>(); }

// ---- Shortcut object (Windows, IShellLink): set properties, then .Save ----
struct ShortcutObject : IObject {
    std::string lnkPath, target, args, workDir, iconLoc, desc;
    int iconIndex = 0;
    explicit ShortcutObject(std::string p) : lnkPath(std::move(p)) {}
    std::string typeName() const override { return "Shortcut"; }
    Value get(Interpreter&, const std::string& member, std::vector<Value>&) override {
        std::string m = toLower(member);
        if (m == "targetpath")       return Value::str(target);
        if (m == "arguments")        return Value::str(args);
        if (m == "workingdirectory") return Value::str(workDir);
        if (m == "iconlocation")     return Value::str(iconLoc);
        if (m == "description")      return Value::str(desc);
        if (m == "fullname" || m == "shortcutpath") return Value::str(lnkPath);
        if (m == "save") { save(); return Value::empty(); }
        raiseErr(438, "Shortcut has no member '" + member + "'");
        return Value::empty();
    }
    void set(Interpreter&, const std::string& member, std::vector<Value>&, const Value& val, bool) override {
        std::string m = toLower(member);
        if      (m == "targetpath")       target  = val.toStr();
        else if (m == "arguments")        args    = val.toStr();
        else if (m == "workingdirectory") workDir = val.toStr();
        else if (m == "iconlocation")     iconLoc = val.toStr();
        else if (m == "description")      desc    = val.toStr();
        else raiseErr(438, "Shortcut has no property '" + member + "'");
    }
    void save() {
        IShellLinkW* link = nullptr;
        HRESULT hr = CoCreateInstance(CLSID_ShellLink, NULL, CLSCTX_INPROC_SERVER,
                                      IID_IShellLinkW, (void**)&link);
        if (FAILED(hr) || !link) raiseErr(5, "CreateShortcut: cannot create shell link");
        link->SetPath(utf8ToWide(target).c_str());
        if (!args.empty())    link->SetArguments(utf8ToWide(args).c_str());
        if (!workDir.empty()) link->SetWorkingDirectory(utf8ToWide(workDir).c_str());
        if (!desc.empty())    link->SetDescription(utf8ToWide(desc).c_str());
        if (!iconLoc.empty()) link->SetIconLocation(utf8ToWide(iconLoc).c_str(), iconIndex);
        IPersistFile* pf = nullptr;
        hr = link->QueryInterface(IID_IPersistFile, (void**)&pf);
        if (SUCCEEDED(hr) && pf) { pf->Save(utf8ToWide(lnkPath).c_str(), TRUE); pf->Release(); }
        link->Release();
        if (FAILED(hr)) raiseErr(5, "CreateShortcut: cannot save '" + lnkPath + "'");
    }
};
static ObjectPtr shellMakeShortcut(const std::string& path) { return std::make_shared<ShortcutObject>(path); }

// ---- AppActivate (Windows): bring a top-level window to the foreground by title ----
struct FindWinData { std::wstring want; HWND hit; };
static BOOL CALLBACK appActivateEnum(HWND hwnd, LPARAM lp) {
    FindWinData* d = (FindWinData*)lp;
    if (!IsWindowVisible(hwnd)) return TRUE;
    int len = GetWindowTextLengthW(hwnd);
    if (len <= 0) return TRUE;
    std::wstring title((size_t)len + 1, L'\0');
    GetWindowTextW(hwnd, &title[0], len + 1);
    title.resize((size_t)len);
    if (title.find(d->want) != std::wstring::npos) { d->hit = hwnd; return FALSE; }
    return TRUE;
}
static bool shellAppActivate(const std::string& title) {
    FindWinData d{ utf8ToWide(title), NULL };
    EnumWindows(appActivateEnum, (LPARAM)&d);
    if (!d.hit) return false;
    if (IsIconic(d.hit)) ShowWindow(d.hit, SW_RESTORE);
    return SetForegroundWindow(d.hit) ? true : false;
}
// ---- Shell helpers (Windows): environment enumeration, registry, special folders ----
static std::vector<std::string> shellEnvStrings() {
    std::vector<std::string> v;
    LPWCH env = GetEnvironmentStringsW();
    if (!env) return v;
    for (LPWCH p = env; *p; ) {
        int len = 0; while (p[len]) ++len;
        std::string s = wideToUtf8(p, len);
        if (!s.empty() && s[0] != '=') v.push_back(s);   // skip "=C:=..." drive-letter entries
        p += len + 1;
    }
    FreeEnvironmentStringsW(env);
    return v;
}
static bool parseRegHive(const std::string& key, HKEY& root, std::string& sub, std::string& value) {
    size_t bs = key.find('\\');
    std::string hive = (bs == std::string::npos) ? key : key.substr(0, bs);
    std::string rest = (bs == std::string::npos) ? std::string() : key.substr(bs + 1);
    std::string h = hive; for (auto& c : h) c = (char)toupper((unsigned char)c);
    if      (h == "HKEY_CURRENT_USER"   || h == "HKCU") root = HKEY_CURRENT_USER;
    else if (h == "HKEY_LOCAL_MACHINE"  || h == "HKLM") root = HKEY_LOCAL_MACHINE;
    else if (h == "HKEY_CLASSES_ROOT"   || h == "HKCR") root = HKEY_CLASSES_ROOT;
    else if (h == "HKEY_USERS"          || h == "HKU")  root = HKEY_USERS;
    else if (h == "HKEY_CURRENT_CONFIG" || h == "HKCC") root = HKEY_CURRENT_CONFIG;
    else return false;
    size_t last = rest.find_last_of('\\');
    if (last == std::string::npos) { sub.clear(); value = rest; }
    else { sub = rest.substr(0, last); value = rest.substr(last + 1); }
    return true;
}
static std::string shellRegRead(const std::string& key) {
    HKEY root; std::string sub, value;
    if (!parseRegHive(key, root, sub, value)) raiseErr(5, "RegRead: invalid key '" + key + "'");
    std::wstring wsub = utf8ToWide(sub), wval = utf8ToWide(value);
    HKEY hk;
    if (RegOpenKeyExW(root, wsub.c_str(), 0, KEY_QUERY_VALUE, &hk) != ERROR_SUCCESS)
        raiseErr(5, "RegRead: cannot open '" + key + "'");
    DWORD type = 0, cb = 0;
    LONG r = RegQueryValueExW(hk, value.empty() ? nullptr : wval.c_str(), nullptr, &type, nullptr, &cb);
    if (r != ERROR_SUCCESS) { RegCloseKey(hk); raiseErr(5, "RegRead: cannot read '" + key + "'"); }
    std::vector<BYTE> buf(cb ? cb : 1);
    r = RegQueryValueExW(hk, value.empty() ? nullptr : wval.c_str(), nullptr, &type, buf.data(), &cb);
    RegCloseKey(hk);
    if (r != ERROR_SUCCESS) raiseErr(5, "RegRead: cannot read '" + key + "'");
    if (type == REG_DWORD && cb >= sizeof(DWORD)) { DWORD d; memcpy(&d, buf.data(), sizeof(d)); return std::to_string((long)d); }
    if (type == REG_SZ || type == REG_EXPAND_SZ || type == REG_MULTI_SZ) {
        const wchar_t* w = (const wchar_t*)buf.data();
        int len = (int)(cb / sizeof(wchar_t)); if (len > 0 && w[len - 1] == 0) --len;
        return wideToUtf8(w, len);
    }
    return "";
}
static void shellRegWrite(const std::string& key, const Value& v, const std::string& type) {
    HKEY root; std::string sub, value;
    if (!parseRegHive(key, root, sub, value)) raiseErr(5, "RegWrite: invalid key '" + key + "'");
    std::wstring wsub = utf8ToWide(sub), wval = utf8ToWide(value);
    HKEY hk;
    if (RegCreateKeyExW(root, wsub.c_str(), 0, nullptr, 0, KEY_SET_VALUE, nullptr, &hk, nullptr) != ERROR_SUCCESS)
        raiseErr(5, "RegWrite: cannot open '" + key + "'");
    std::string t = type; for (auto& c : t) c = (char)toupper((unsigned char)c);
    LONG r;
    if (t == "REG_DWORD") {
        DWORD d = (DWORD)v.toI64();
        r = RegSetValueExW(hk, value.empty() ? nullptr : wval.c_str(), 0, REG_DWORD, (const BYTE*)&d, sizeof(d));
    } else {
        std::wstring wd = utf8ToWide(v.toStr());
        DWORD ty = (t == "REG_EXPAND_SZ") ? REG_EXPAND_SZ : REG_SZ;
        r = RegSetValueExW(hk, value.empty() ? nullptr : wval.c_str(), 0, ty,
                           (const BYTE*)wd.c_str(), (DWORD)((wd.size() + 1) * sizeof(wchar_t)));
    }
    RegCloseKey(hk);
    if (r != ERROR_SUCCESS) raiseErr(5, "RegWrite: cannot write '" + key + "'");
}
static void shellRegDelete(const std::string& key) {
    HKEY root; std::string sub, value;
    if (!parseRegHive(key, root, sub, value)) raiseErr(5, "RegDelete: invalid key '" + key + "'");
    std::wstring wsub = utf8ToWide(sub), wval = utf8ToWide(value);
    LONG r;
    if (!key.empty() && key.back() == '\\') {
        r = RegDeleteKeyW(root, wsub.c_str());           // trailing '\' -> delete the key itself
    } else {
        HKEY hk;
        if (RegOpenKeyExW(root, wsub.c_str(), 0, KEY_SET_VALUE, &hk) != ERROR_SUCCESS)
            raiseErr(5, "RegDelete: cannot open '" + key + "'");
        r = RegDeleteValueW(hk, wval.c_str());
        RegCloseKey(hk);
    }
    if (r != ERROR_SUCCESS) raiseErr(5, "RegDelete: cannot delete '" + key + "'");
}
static std::string shellSpecialFolder(const std::string& name) {
    std::string n = name; for (auto& c : n) c = (char)tolower((unsigned char)c);
    int csidl = -1;
    if      (n == "desktop")         csidl = CSIDL_DESKTOPDIRECTORY;
    else if (n == "alluserdesktop")  csidl = CSIDL_COMMON_DESKTOPDIRECTORY;
    else if (n == "mydocuments" || n == "personal") csidl = CSIDL_PERSONAL;
    else if (n == "favorites")       csidl = CSIDL_FAVORITES;
    else if (n == "programs")        csidl = CSIDL_PROGRAMS;
    else if (n == "startmenu")       csidl = CSIDL_STARTMENU;
    else if (n == "startup")         csidl = CSIDL_STARTUP;
    else if (n == "appdata")         csidl = CSIDL_APPDATA;
    else if (n == "windows")         csidl = CSIDL_WINDOWS;
    else if (n == "system")          csidl = CSIDL_SYSTEM;
    else if (n == "sendto")          csidl = CSIDL_SENDTO;
    else if (n == "fonts")           csidl = CSIDL_FONTS;
    else if (n == "templates")       csidl = CSIDL_TEMPLATES;
    else return "";
    wchar_t path[MAX_PATH];
    if (SHGetFolderPathW(nullptr, csidl, nullptr, 0, path) != S_OK) return "";
    int len = 0; while (path[len]) ++len;
    return wideToUtf8(path, len);
}

static void dirSleepMs(long long ms) { if (ms > 0) ::Sleep((DWORD)ms); }


// ---- TextWindow (Windows) ---------------------------------------------------
// Output pane on top, editable input pane below, Submit bottom-right. The window
// lives on its own thread with its own message loop, so it stays responsive while
// the script is busy and output appears as it is written. The script thread never
// touches a control directly: everything goes through SendMessage/PostMessage, and
// the shared buffers are guarded by a critical section.
#define TWM_FLUSH    (WM_APP + 1)
#define TWM_CLEAR    (WM_APP + 2)
#define TWM_SETOUT   (WM_APP + 3)
#define TWM_SETIN    (WM_APP + 4)
#define TWM_TITLE    (WM_APP + 5)
#define TWM_FONT     (WM_APP + 6)
#define TWM_LAYOUT   (WM_APP + 7)
#define TWM_WRAP     (WM_APP + 8)
#define TWM_SHOW     (WM_APP + 9)
#define TWM_SIZE     (WM_APP + 10)
#define TWM_ACTIVATE (WM_APP + 11)
#define TWM_GETOUT   (WM_APP + 12)
#define TWM_GETIN    (WM_APP + 13)
#define TWM_QUIT     (WM_APP + 14)
#define TW_IDC_OUT    1001
#define TW_IDC_IN     1002
#define TW_IDC_SUBMIT 1003
#define TW_MARGIN     6
#define TW_BTNSTRIP  34
#define TW_BTNW      96
#define TW_BTNH      24

struct TwWin {
    HWND hwnd = nullptr, hOut = nullptr, hIn = nullptr, hBtn = nullptr;
    HFONT font = nullptr;
    HANDLE thread = nullptr, hReady = nullptr, hInput = nullptr, hClosed = nullptr;
    CRITICAL_SECTION cs;
    std::wstring pend;          // written but not yet in the control
    std::wstring kept;          // the transcript while no window exists
    std::wstring inQueue;       // submitted, not yet read
    std::wstring title = L"Directive", fontName = L"Consolas";
    int  wndW = 720, wndH = 460, fontSize = 10;
    bool wordWrap = true, showInput = true, echoInput = true;
    bool submitOnEnter = false, wantVisible = true;
};

static WNDPROC g_twPrevEdit = nullptr;
static LONG    g_twClsReg = 0;
static const wchar_t* TW_CLASS = L"DirectiveTextWindow";

// Lone LF or CR become CRLF, so a script using dsLf does not print boxes.
static void twAppendNorm(std::wstring& dst, const std::wstring& s) {
    dst.reserve(dst.size() + s.size());
    for (size_t i = 0; i < s.size(); ++i) {
        wchar_t c = s[i];
        if (c == L'\r') {
            dst += L"\r\n";
            if (i + 1 < s.size() && s[i + 1] == L'\n') ++i;
        } else if (c == L'\n') {
            dst += L"\r\n";
        } else {
            dst += c;
        }
    }
}

static void twLayout(TwWin* self) {
    RECT rc; GetClientRect(self->hwnd, &rc);
    int w = rc.right, h = rc.bottom;
    int cw = w - TW_MARGIN * 2; if (cw < 0) cw = 0;

    if (!self->showInput) {
        int oh = h - TW_MARGIN * 2; if (oh < 0) oh = 0;
        if (IsWindowVisible(self->hIn))  ShowWindow(self->hIn,  SW_HIDE);
        if (IsWindowVisible(self->hBtn)) ShowWindow(self->hBtn, SW_HIDE);
        SetWindowPos(self->hOut, nullptr, TW_MARGIN, TW_MARGIN, cw, oh,
                     SWP_NOZORDER | SWP_NOACTIVATE);
        return;
    }
    // Split what is left after the margins and the button strip, so the panes can
    // never overlap or spill past the bottom however fast the drag.
    int avail = h - TW_MARGIN * 3 - TW_BTNSTRIP; if (avail < 0) avail = 0;
    int inH = 110; if (inH > avail / 2) inH = avail / 2;
    int outH = avail - inH;
    int btnX = w - TW_MARGIN - TW_BTNW; if (btnX < TW_MARGIN) btnX = TW_MARGIN;
    int btnY = TW_MARGIN * 2 + outH + inH + (TW_BTNSTRIP - TW_BTNH) / 2;

    HDWP dwp = BeginDeferWindowPos(3);
    if (dwp) {
        dwp = DeferWindowPos(dwp, self->hOut, nullptr, TW_MARGIN, TW_MARGIN, cw, outH,
                             SWP_NOZORDER | SWP_NOACTIVATE);
        if (dwp) dwp = DeferWindowPos(dwp, self->hIn, nullptr, TW_MARGIN,
                                      TW_MARGIN * 2 + outH, cw, inH,
                                      SWP_NOZORDER | SWP_NOACTIVATE);
        if (dwp) dwp = DeferWindowPos(dwp, self->hBtn, nullptr, btnX, btnY,
                                      TW_BTNW, TW_BTNH,
                                      SWP_NOZORDER | SWP_NOACTIVATE | SWP_NOCOPYBITS);
        if (dwp) EndDeferWindowPos(dwp);
    }
    if (!IsWindowVisible(self->hIn))  ShowWindow(self->hIn,  SW_SHOW);
    if (!IsWindowVisible(self->hBtn)) ShowWindow(self->hBtn, SW_SHOW);
}

static void twApplyFont(TwWin* self) {
    LOGFONTW lf; ZeroMemory(&lf, sizeof(lf));
    HDC hdc = GetDC(nullptr);
    lf.lfHeight = -MulDiv(self->fontSize, GetDeviceCaps(hdc, LOGPIXELSY), 72);
    ReleaseDC(nullptr, hdc);
    lf.lfWeight = FW_NORMAL;
    lf.lfCharSet = DEFAULT_CHARSET;
    lf.lfQuality = CLEARTYPE_QUALITY;
    lf.lfPitchAndFamily = FIXED_PITCH | FF_MODERN;
    lstrcpynW(lf.lfFaceName, self->fontName.c_str(), 32);
    HFONT old = self->font;
    self->font = CreateFontIndirectW(&lf);
    if (!self->font) { self->font = old; return; }
    SendMessageW(self->hOut, WM_SETFONT, (WPARAM)self->font, TRUE);
    SendMessageW(self->hIn,  WM_SETFONT, (WPARAM)self->font, TRUE);
    if (old) DeleteObject(old);
}

static void twFlush(TwWin* self) {
    std::wstring text;
    EnterCriticalSection(&self->cs);
    text.swap(self->pend);
    LeaveCriticalSection(&self->cs);
    if (text.empty()) return;
    int end = GetWindowTextLengthW(self->hOut);
    SendMessageW(self->hOut, EM_SETSEL, (WPARAM)end, (LPARAM)end);
    SendMessageW(self->hOut, EM_REPLACESEL, FALSE, (LPARAM)text.c_str());
    SendMessageW(self->hOut, EM_SCROLLCARET, 0, 0);
}

static void twSubmit(TwWin* self) {
    int n = GetWindowTextLengthW(self->hIn);
    std::wstring buf((size_t)n + 1, L'\0');
    if (n > 0) GetWindowTextW(self->hIn, &buf[0], n + 1);
    buf.resize((size_t)n);

    EnterCriticalSection(&self->cs);
    twAppendNorm(self->inQueue, buf);
    self->inQueue += L"\r\n";                 // a submission always ends a line
    if (self->echoInput) twAppendNorm(self->pend, buf + L"\r\n");
    LeaveCriticalSection(&self->cs);

    if (self->echoInput) twFlush(self);
    SetWindowTextW(self->hIn, L"");
    SetEvent(self->hInput);
}

// Subclass the input pane so Enter / Ctrl+Enter can submit.
static LRESULT CALLBACK twInputProc(HWND h, UINT m, WPARAM w, LPARAM l) {
    TwWin* self = (TwWin*)GetWindowLongPtrW(GetParent(h), GWLP_USERDATA);
    if (m == WM_KEYDOWN && w == VK_RETURN && self) {
        bool ctrl  = (GetKeyState(VK_CONTROL) & 0x8000) != 0;
        bool shift = (GetKeyState(VK_SHIFT)   & 0x8000) != 0;
        if (ctrl || (self->submitOnEnter && !shift)) { twSubmit(self); return 0; }
    }
    if (m == WM_CHAR && w == L'\n') return 0;      // swallow the Ctrl+Enter beep
    return CallWindowProcW(g_twPrevEdit, h, m, w, l);
}

static LRESULT CALLBACK twWndProc(HWND h, UINT m, WPARAM w, LPARAM l) {
    TwWin* self = (TwWin*)GetWindowLongPtrW(h, GWLP_USERDATA);
    switch (m) {
    case WM_NCCREATE:
        self = (TwWin*)((CREATESTRUCTW*)l)->lpCreateParams;
        SetWindowLongPtrW(h, GWLP_USERDATA, (LONG_PTR)self);
        return DefWindowProcW(h, m, w, l);
    case WM_SIZE:           if (self) twLayout(self); return 0;
    case WM_GETMINMAXINFO: {
        MINMAXINFO* mmi = (MINMAXINFO*)l;
        mmi->ptMinTrackSize.x = 360; mmi->ptMinTrackSize.y = 260; return 0; }
    case WM_SETFOCUS:       if (self && self->showInput) SetFocus(self->hIn); return 0;
    case WM_COMMAND:
        if (self && LOWORD(w) == TW_IDC_SUBMIT && HIWORD(w) == BN_CLICKED) {
            twSubmit(self);
            if (self->showInput) SetFocus(self->hIn);
            return 0;
        }
        break;
    case TWM_FLUSH:    if (self) twFlush(self); return 0;
    case TWM_CLEAR:    if (self) SetWindowTextW(self->hOut, L""); return 0;
    case TWM_SETOUT:   if (self) SetWindowTextW(self->hOut, (const wchar_t*)w); return 0;
    case TWM_SETIN:    if (self) SetWindowTextW(self->hIn,  (const wchar_t*)w); return 0;
    case TWM_TITLE:    SetWindowTextW(h, (const wchar_t*)w); return 0;
    case TWM_FONT:     if (self) twApplyFont(self); return 0;
    case TWM_LAYOUT:   if (self) twLayout(self); return 0;
    case TWM_ACTIVATE: ShowWindow(h, SW_SHOW); SetForegroundWindow(h); BringWindowToTop(h); return 0;
    case TWM_SHOW:
        ShowWindow(h, (int)w);
        if ((int)w != SW_HIDE) { SetForegroundWindow(h); if (self && self->showInput) SetFocus(self->hIn); }
        return 0;
    case TWM_SIZE: {
        RECT rc = {0, 0, (LONG)w, (LONG)l};
        AdjustWindowRectEx(&rc, (DWORD)GetWindowLongW(h, GWL_STYLE), FALSE,
                           (DWORD)GetWindowLongW(h, GWL_EXSTYLE));
        SetWindowPos(h, nullptr, 0, 0, rc.right - rc.left, rc.bottom - rc.top,
                     SWP_NOMOVE | SWP_NOZORDER);
        return 0; }
    case TWM_GETOUT: case TWM_GETIN: {
        if (!self) return 0;
        HWND c = (m == TWM_GETOUT) ? self->hOut : self->hIn;
        std::wstring* out = (std::wstring*)l;
        int n = GetWindowTextLengthW(c);
        out->assign((size_t)n + 1, L'\0');
        if (n > 0) GetWindowTextW(c, &(*out)[0], n + 1);
        out->resize((size_t)n);
        return 0; }
    case TWM_WRAP: {                          // wrap is fixed at creation: rebuild
        if (!self) return 0;
        std::wstring keep;
        int n = GetWindowTextLengthW(self->hOut);
        keep.assign((size_t)n + 1, L'\0');
        if (n > 0) GetWindowTextW(self->hOut, &keep[0], n + 1);
        keep.resize((size_t)n);
        DWORD style = WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_TABSTOP | WS_CLIPSIBLINGS |
                      ES_MULTILINE | ES_AUTOVSCROLL | ES_READONLY | ES_NOHIDESEL;
        if (!self->wordWrap) style |= ES_AUTOHSCROLL | WS_HSCROLL;
        DestroyWindow(self->hOut);
        self->hOut = CreateWindowExW(WS_EX_CLIENTEDGE, L"EDIT", nullptr, style,
                                     0, 0, 10, 10, h, (HMENU)(UINT_PTR)TW_IDC_OUT,
                                     GetModuleHandleW(nullptr), nullptr);
        SendMessageW(self->hOut, EM_SETLIMITTEXT, 0, 0);
        if (self->font) SendMessageW(self->hOut, WM_SETFONT, (WPARAM)self->font, TRUE);
        SetWindowTextW(self->hOut, keep.c_str());
        twLayout(self);
        return 0; }
    case TWM_QUIT:  DestroyWindow(h); return 0;
    case WM_CLOSE:  DestroyWindow(h); return 0;
    case WM_DESTROY:
        if (self) {
            // Keep the transcript: a script almost always reads Text after
            // WaitForClose, and the control is about to disappear.
            int n = GetWindowTextLengthW(self->hOut);
            std::wstring t((size_t)n + 1, L'\0');
            if (n > 0) GetWindowTextW(self->hOut, &t[0], n + 1);
            t.resize((size_t)n);
            EnterCriticalSection(&self->cs);
            self->kept.swap(t);
            self->hwnd = nullptr;   // before signalling, so a WaitForClose that
            LeaveCriticalSection(&self->cs);   // returns at once reads the kept text
            SetEvent(self->hClosed);
            SetEvent(self->hInput);
        }
        PostQuitMessage(0);
        return 0;
    default: break;
    }
    return DefWindowProcW(h, m, w, l);
}

static DWORD WINAPI twUiThread(LPVOID param) {
    TwWin* self = (TwWin*)param;
    if (InterlockedCompareExchange(&g_twClsReg, 1, 0) == 0) {
        WNDCLASSEXW wc; ZeroMemory(&wc, sizeof(wc));
        wc.cbSize = sizeof(wc);
        wc.style = CS_HREDRAW | CS_VREDRAW;
        wc.lpfnWndProc = twWndProc;
        wc.hInstance = GetModuleHandleW(nullptr);
        wc.hCursor = LoadCursorW(nullptr, (LPCWSTR)IDC_ARROW);
        wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
        wc.lpszClassName = TW_CLASS;
        wc.hIcon = LoadIconW(nullptr, (LPCWSTR)IDI_APPLICATION);
        if (!RegisterClassExW(&wc)) InterlockedExchange(&g_twClsReg, 0);
    }
    self->hwnd = CreateWindowExW(0, TW_CLASS, self->title.c_str(),
                                 WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN,
                                 CW_USEDEFAULT, CW_USEDEFAULT, self->wndW, self->wndH,
                                 nullptr, nullptr, GetModuleHandleW(nullptr), self);
    if (!self->hwnd) { SetEvent(self->hReady); return 1; }

    DWORD style = WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_TABSTOP | WS_CLIPSIBLINGS |
                  ES_MULTILINE | ES_AUTOVSCROLL | ES_READONLY | ES_NOHIDESEL;
    if (!self->wordWrap) style |= ES_AUTOHSCROLL | WS_HSCROLL;
    HINSTANCE hi = GetModuleHandleW(nullptr);
    self->hOut = CreateWindowExW(WS_EX_CLIENTEDGE, L"EDIT", nullptr, style,
                                 0, 0, 10, 10, self->hwnd, (HMENU)(UINT_PTR)TW_IDC_OUT, hi, nullptr);
    self->hIn  = CreateWindowExW(WS_EX_CLIENTEDGE, L"EDIT", nullptr,
                                 WS_CHILD | WS_VISIBLE | WS_VSCROLL | WS_TABSTOP |
                                 WS_CLIPSIBLINGS | ES_MULTILINE | ES_AUTOVSCROLL | ES_WANTRETURN,
                                 0, 0, 10, 10, self->hwnd, (HMENU)(UINT_PTR)TW_IDC_IN, hi, nullptr);
    self->hBtn = CreateWindowExW(0, L"BUTTON", L"Submit",
                                 WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_CLIPSIBLINGS | BS_PUSHBUTTON,
                                 0, 0, TW_BTNW, TW_BTNH, self->hwnd,
                                 (HMENU)(UINT_PTR)TW_IDC_SUBMIT, hi, nullptr);
    SendMessageW(self->hOut, EM_SETLIMITTEXT, 0, 0);
    SendMessageW(self->hIn,  EM_SETLIMITTEXT, 0, 0);
    if (!g_twPrevEdit)
        g_twPrevEdit = (WNDPROC)(LONG_PTR)GetWindowLongPtrW(self->hIn, GWLP_WNDPROC);
    SetWindowLongPtrW(self->hIn, GWLP_WNDPROC, (LONG_PTR)twInputProc);

    twApplyFont(self);
    {   // Restore the transcript when the window is being brought back by Show.
        std::wstring seed;
        EnterCriticalSection(&self->cs);
        seed.swap(self->kept);
        LeaveCriticalSection(&self->cs);
        if (!seed.empty()) SetWindowTextW(self->hOut, seed.c_str());
    }
    twLayout(self);
    if (self->wantVisible) {
        ShowWindow(self->hwnd, SW_SHOW);
        if (self->showInput) SetFocus(self->hIn);
    }
    SetEvent(self->hReady);

    MSG msg;
    while (GetMessageW(&msg, nullptr, 0, 0) > 0) { TranslateMessage(&msg); DispatchMessageW(&msg); }
    self->hwnd = nullptr;                 // never message a destroyed window
    if (self->font) { DeleteObject(self->font); self->font = nullptr; }
    SetEvent(self->hClosed);
    SetEvent(self->hInput);
    return 0;
}

// Wait on an event while still pumping this thread's messages, so the script host's
// apartment is never starved during a blocking read.
static bool twWaitPumped(TwWin* s, HANDLE ev) {
    for (;;) {
        HANDLE hs[2] = { ev, s->hClosed };
        DWORD r = MsgWaitForMultipleObjects(2, hs, FALSE, INFINITE, QS_ALLINPUT);
        if (r == WAIT_OBJECT_0)     return true;
        if (r == WAIT_OBJECT_0 + 1) return false;
        MSG m;
        while (PeekMessageW(&m, nullptr, 0, 0, PM_REMOVE)) { TranslateMessage(&m); DispatchMessageW(&m); }
    }
}

// ---- the API the script object calls ----------------------------------------
static bool twStart(TwWin* s) {
    if (s->thread) { WaitForSingleObject(s->thread, 5000); CloseHandle(s->thread); s->thread = nullptr; }
    ResetEvent(s->hReady);
    ResetEvent(s->hClosed);
    s->thread = CreateThread(nullptr, 0, twUiThread, s, 0, nullptr);
    if (!s->thread) return false;
    WaitForSingleObject(s->hReady, 10000);
    return s->hwnd != nullptr;
}
static void* twOpen(const TwOpts& o) {
    TwWin* s = new TwWin();
    s->title = utf8ToWide(o.title); s->fontName = utf8ToWide(o.fontName);
    s->wndW = o.width; s->wndH = o.height; s->fontSize = o.fontSize;
    s->wordWrap = o.wordWrap; s->showInput = o.showInput; s->echoInput = o.echoInput;
    s->submitOnEnter = o.submitOnEnter; s->wantVisible = o.visible;
    InitializeCriticalSection(&s->cs);
    s->hReady  = CreateEventW(nullptr, TRUE,  FALSE, nullptr);
    s->hInput  = CreateEventW(nullptr, FALSE, FALSE, nullptr);
    s->hClosed = CreateEventW(nullptr, TRUE,  FALSE, nullptr);
    if (!twStart(s)) { DeleteCriticalSection(&s->cs); delete s; return nullptr; }
    return s;
}
static void twWrite(void* h, const std::string& t) {
    TwWin* s = (TwWin*)h; if (!s) return;
    EnterCriticalSection(&s->cs);
    // With no window the text still accumulates, so the transcript stays whole
    // and Show can bring it back.
    twAppendNorm(s->hwnd ? s->pend : s->kept, utf8ToWide(t));
    LeaveCriticalSection(&s->cs);
    if (s->hwnd) SendMessageW(s->hwnd, TWM_FLUSH, 0, 0);
}
static std::string twGetText(void* h) {
    TwWin* s = (TwWin*)h; if (!s) return std::string();
    if (!s->hwnd) {                       // closed: hand back what was kept
        EnterCriticalSection(&s->cs);
        std::wstring t = s->kept;
        LeaveCriticalSection(&s->cs);
        return wideToUtf8(t.c_str(), (int)t.size());
    }
    SendMessageW(s->hwnd, TWM_FLUSH, 0, 0);
    std::wstring out; SendMessageW(s->hwnd, TWM_GETOUT, 0, (LPARAM)&out);
    return wideToUtf8(out.c_str(), (int)out.size());
}
static void twSetText(void* h, const std::string& t) {
    TwWin* s = (TwWin*)h; if (!s) return;
    std::wstring w; twAppendNorm(w, utf8ToWide(t));
    EnterCriticalSection(&s->cs);
    s->pend.clear();
    if (!s->hwnd) s->kept = w;
    LeaveCriticalSection(&s->cs);
    if (s->hwnd) SendMessageW(s->hwnd, TWM_SETOUT, (WPARAM)w.c_str(), 0);
}
static void twClear(void* h) {
    TwWin* s = (TwWin*)h; if (!s) return;
    EnterCriticalSection(&s->cs); s->pend.clear(); s->kept.clear(); LeaveCriticalSection(&s->cs);
    if (s->hwnd) SendMessageW(s->hwnd, TWM_CLEAR, 0, 0);
}
static std::string twGetInput(void* h) {
    TwWin* s = (TwWin*)h; if (!s || !s->hwnd) return std::string();
    std::wstring out; SendMessageW(s->hwnd, TWM_GETIN, 0, (LPARAM)&out);
    return wideToUtf8(out.c_str(), (int)out.size());
}
static void twSetInput(void* h, const std::string& t) {
    TwWin* s = (TwWin*)h; if (!s || !s->hwnd) return;
    std::wstring w = utf8ToWide(t);
    SendMessageW(s->hwnd, TWM_SETIN, (WPARAM)w.c_str(), 0);
}
static void twClearInput(void* h) {
    TwWin* s = (TwWin*)h; if (!s) return;
    EnterCriticalSection(&s->cs); s->inQueue.clear(); LeaveCriticalSection(&s->cs);
    if (s->hwnd) SendMessageW(s->hwnd, TWM_SETIN, (WPARAM)L"", 0);
}
static bool twHasInput(void* h) {
    TwWin* s = (TwWin*)h; if (!s) return false;
    EnterCriticalSection(&s->cs); bool any = !s->inQueue.empty(); LeaveCriticalSection(&s->cs);
    return any;
}
// Returns false when the window closed with nothing left to hand back.
static bool twReadLine(void* h, std::string& out) {
    TwWin* s = (TwWin*)h; if (!s) return false;
    for (;;) {
        EnterCriticalSection(&s->cs);
        size_t nl = s->inQueue.find(L"\r\n");
        bool got = (nl != std::wstring::npos);
        std::wstring line;
        if (got) { line = s->inQueue.substr(0, nl); s->inQueue.erase(0, nl + 2); }
        LeaveCriticalSection(&s->cs);
        if (got) { out = wideToUtf8(line.c_str(), (int)line.size()); return true; }
        if (!twWaitPumped(s, s->hInput)) return false;
    }
}
static bool twReadAll(void* h, std::string& out) {
    TwWin* s = (TwWin*)h; if (!s) return false;
    for (;;) {
        EnterCriticalSection(&s->cs);
        bool got = !s->inQueue.empty();
        std::wstring all;
        if (got) { all.swap(s->inQueue); }
        LeaveCriticalSection(&s->cs);
        if (got) {
            while (all.size() >= 2 && all.compare(all.size() - 2, 2, L"\r\n") == 0)
                all.resize(all.size() - 2);
            out = wideToUtf8(all.c_str(), (int)all.size());
            return true;
        }
        if (!twWaitPumped(s, s->hInput)) return false;
    }
}
static void twShow(void* h, int cmd) {
    TwWin* s = (TwWin*)h; if (!s) return;
    if (!s->hwnd && cmd != 0) { s->wantVisible = true; twStart(s); return; }  // reopen
    if (s->hwnd) SendMessageW(s->hwnd, TWM_SHOW, (WPARAM)cmd, 0);
}
static void twActivate(void* h) {
    TwWin* s = (TwWin*)h; if (s && s->hwnd) SendMessageW(s->hwnd, TWM_ACTIVATE, 0, 0);
}
static void twClose(void* h) {
    TwWin* s = (TwWin*)h; if (s && s->hwnd) PostMessageW(s->hwnd, TWM_QUIT, 0, 0);
}
static bool twIsClosed(void* h) {
    TwWin* s = (TwWin*)h;
    return !s || WaitForSingleObject(s->hClosed, 0) == WAIT_OBJECT_0;
}
static bool twIsVisible(void* h) {
    TwWin* s = (TwWin*)h;
    return s && s->hwnd && IsWindowVisible(s->hwnd) != 0;
}
static void twWaitForClose(void* h) {
    TwWin* s = (TwWin*)h; if (!s) return;
    twWaitPumped(s, s->hClosed);
}
static void twSetTitle(void* h, const std::string& t) {
    TwWin* s = (TwWin*)h; if (!s || !s->hwnd) return;
    std::wstring w = utf8ToWide(t); s->title = w;
    SendMessageW(s->hwnd, TWM_TITLE, (WPARAM)w.c_str(), 0);
}
static void twSetSize(void* h, int w, int ht) {
    TwWin* s = (TwWin*)h; if (!s || !s->hwnd) return;
    s->wndW = w; s->wndH = ht;
    SendMessageW(s->hwnd, TWM_SIZE, (WPARAM)w, (LPARAM)ht);
}
static void twSetFont(void* h, const std::string& name, int size) {
    TwWin* s = (TwWin*)h; if (!s || !s->hwnd) return;
    s->fontName = utf8ToWide(name); s->fontSize = size;
    SendMessageW(s->hwnd, TWM_FONT, 0, 0);
}
static void twSetWrap(void* h, bool on) {
    TwWin* s = (TwWin*)h; if (!s || !s->hwnd || s->wordWrap == on) return;
    s->wordWrap = on; SendMessageW(s->hwnd, TWM_WRAP, 0, 0);
}
static void twSetShowInput(void* h, bool on) {
    TwWin* s = (TwWin*)h; if (!s || !s->hwnd) return;
    s->showInput = on; SendMessageW(s->hwnd, TWM_LAYOUT, 0, 0);
}
static void twSetEcho(void* h, bool on)   { TwWin* s = (TwWin*)h; if (s) s->echoInput = on; }
static void twSetSubmitEnter(void* h, bool on) { TwWin* s = (TwWin*)h; if (s) s->submitOnEnter = on; }
static bool twGetFlag(void* h, int which) {
    TwWin* s = (TwWin*)h; if (!s) return false;
    return which == 0 ? s->wordWrap : which == 1 ? s->showInput
         : which == 2 ? s->echoInput : s->submitOnEnter;
}
static void twDestroy(void* h) {
    TwWin* s = (TwWin*)h; if (!s) return;
    if (s->hwnd) PostMessageW(s->hwnd, TWM_QUIT, 0, 0);
    if (s->thread) { WaitForSingleObject(s->thread, 5000); CloseHandle(s->thread); }
    if (s->hReady)  CloseHandle(s->hReady);
    if (s->hInput)  CloseHandle(s->hInput);
    if (s->hClosed) CloseHandle(s->hClosed);
    DeleteCriticalSection(&s->cs);
    delete s;
}

static std::string hostExePath() {
    wchar_t buf[MAX_PATH * 2];
    DWORD n = GetModuleFileNameW(nullptr, buf, (DWORD)(sizeof(buf) / sizeof(buf[0])));
    if (n == 0) return std::string();
    return wideToUtf8(buf, (int)n);
}

// ---- locale (Windows: straight from the OS, so it always agrees with VBScript)
// When the locale came from the machine, query LOCALE_USER_DEFAULT rather than the
// numeric LCID: several fields (LOCALE_SSHORTTIME among them) are only reported for
// the user default, and user overrides apply there too.
static LCID localeLcid() { return g_loc.fromOS ? (LCID)LOCALE_USER_DEFAULT : (LCID)g_loc.lcid; }
static std::string localeQuery(LCID lcid, LCTYPE what, const char* fallback) {
    wchar_t buf[64];
    int n = GetLocaleInfoW(lcid, what, buf, (int)(sizeof(buf) / sizeof(buf[0])));
    if (n <= 1) return fallback;
    return wideToUtf8(buf, n - 1);
}
// LOCALE_SSHORTTIME is Windows 7+ and, unlike most LCTYPEs, is reliably available
// only through GetLocaleInfoEx. Resolve that dynamically so the binary still runs
// on older Windows, and fall back through GetLocaleInfoW to stripping seconds.
#ifndef LOCALE_SSHORTTIME
#define LOCALE_SSHORTTIME 0x0000007F
#endif
static void localeApply(int lcid) {
    LCID use = lcid ? (LCID)lcid : LOCALE_USER_DEFAULT;
    g_loc.fromOS        = (lcid == 0);
    g_loc.lcid          = lcid ? lcid : (int)GetUserDefaultLCID();
    g_loc.decimalSep    = localeQuery(use, LOCALE_SDECIMAL,    ".");
    g_loc.thousandsSep  = localeQuery(use, LOCALE_STHOUSAND,   ",");
    g_loc.currencySym   = localeQuery(use, LOCALE_SCURRENCY,   "$");
    g_loc.currencyPos   = std::atoi(localeQuery(use, LOCALE_ICURRENCY, "0").c_str());
    g_loc.dayFirst      = localeQuery(use, LOCALE_IDATE, "0") == "1";
}
static SYSTEMTIME stFrom(int y, int mo, int d, int h, int mi, int se) {
    SYSTEMTIME st; ZeroMemory(&st, sizeof(st));
    st.wYear = (WORD)y; st.wMonth = (WORD)mo; st.wDay = (WORD)d;
    st.wHour = (WORD)h; st.wMinute = (WORD)mi; st.wSecond = (WORD)se;
    return st;
}
static std::string osFormatDate(int y, int mo, int d) {
    SYSTEMTIME st = stFrom(y, mo, d, 0, 0, 0);
    wchar_t buf[128];
    LCID use = localeLcid();
    int n = GetDateFormatW(use, DATE_SHORTDATE, &st, nullptr, buf, 128);
    if (n <= 1) return std::to_string(mo) + "/" + std::to_string(d) + "/" + std::to_string(y);
    return wideToUtf8(buf, n - 1);
}
static std::string osFormatDateLong(int y, int mo, int d) {
    SYSTEMTIME st = stFrom(y, mo, d, 0, 0, 0);
    wchar_t buf[192];
    LCID use = localeLcid();
    int n = GetDateFormatW(use, DATE_LONGDATE, &st, nullptr, buf, 192);
    if (n <= 1) return osFormatDate(y, mo, d);
    return wideToUtf8(buf, n - 1);
}
static std::string osFormatTimeShort(int h, int mi) {
    SYSTEMTIME st = stFrom(1900, 1, 1, h, mi, 0);
    wchar_t buf[128];
    // vbShortTime follows the locale's OWN short time and ignores the user's
    // customisations: a machine whose long time has been set to 12-hour can still
    // have a 24-hour short time, and VBScript reports the latter. Long time, by
    // contrast, does honour the override -- hence the flag only appears here.
    int n = GetTimeFormatW(localeLcid(), TIME_NOSECONDS | LOCALE_NOUSEROVERRIDE,
                           &st, nullptr, buf, 128);
    if (n <= 1) n = GetTimeFormatW(localeLcid(), TIME_NOSECONDS, &st, nullptr, buf, 128);
    if (n <= 1) { char b[16]; std::snprintf(b, 16, "%02d:%02d", h, mi); return b; }
    return wideToUtf8(buf, n - 1);
}
static std::string osMonthName(int mo, bool abbrev) {
    if (mo < 1 || mo > 12) return "";
    LCID use = localeLcid();
    LCTYPE base = abbrev ? LOCALE_SABBREVMONTHNAME1 : LOCALE_SMONTHNAME1;
    std::string got = localeQuery(use, base + (LCTYPE)(mo - 1), "");
    if (!got.empty()) return got;
    std::string m = kMonths[mo - 1];                 // fallback if the OS declines
    return abbrev ? m.substr(0, 3) : m;
}
static std::string osDayName(int idx, bool abbrev) {
    if (idx < 0 || idx > 6) return "";
    LCID use = localeLcid();
    // Windows numbers days Monday-first; VBScript's index 0 is Sunday.
    LCTYPE base = abbrev ? LOCALE_SABBREVDAYNAME1 : LOCALE_SDAYNAME1;
    std::string got = localeQuery(use, base + (LCTYPE)((idx + 6) % 7), "");
    if (!got.empty()) return got;
    std::string d = kDays[idx];
    return abbrev ? d.substr(0, 3) : d;
}
static std::string osFormatTime(int h, int mi, int se) {
    SYSTEMTIME st = stFrom(1900, 1, 1, h, mi, se);
    wchar_t buf[128];
    LCID use = localeLcid();
    int n = GetTimeFormatW(use, 0, &st, nullptr, buf, 128);
    if (n <= 1) { char b[32]; std::snprintf(b, 32, "%02d:%02d:%02d", h, mi, se); return b; }
    return wideToUtf8(buf, n - 1);
}

// ---- Console control (Windows: Win32 console API) ---------------------------
// Deliberately not VT escapes: SetConsoleTextAttribute & friends work on every
// Windows version and are still honoured under Windows Terminal. VT is enabled
// as well, purely so escape sequences a script writes itself also render.
static HANDLE conOutH() { return GetStdHandle(STD_OUTPUT_HANDLE); }

static bool conAttached() {
    HANDLE h = conOutH();
    if (!h || h == INVALID_HANDLE_VALUE) return false;
    CONSOLE_SCREEN_BUFFER_INFO info;
    return GetConsoleScreenBufferInfo(h, &info) != 0;
}
static WORD conDefaultAttr() {
    static WORD attr = 0x07;
    static bool init = false;
    if (!init) {
        CONSOLE_SCREEN_BUFFER_INFO info;
        if (GetConsoleScreenBufferInfo(conOutH(), &info)) attr = info.wAttributes;
        // Enable VT for script-emitted escapes; ignore failure on legacy hosts.
        DWORD mode = 0;
        if (GetConsoleMode(conOutH(), &mode))
            SetConsoleMode(conOutH(), mode | 0x0004 /*ENABLE_VIRTUAL_TERMINAL_PROCESSING*/);
        init = true;
    }
    return attr;
}
// Only wait for a key when stdin really is the console. A redirected or piped
// stdin (scheduled task, service, CI) must never block on Pause/KeepOpen.
static bool conCanReadKeys() {
    HANDLE h = GetStdHandle(STD_INPUT_HANDLE);
    if (!h || h == INVALID_HANDLE_VALUE) return false;
    DWORD mode = 0;
    return GetConsoleMode(h, &mode) != 0;
}
static bool conOwnsWindow() {
    if (!conAttached()) return false;
    DWORD ids[2] = {0, 0};
    DWORD n = GetConsoleProcessList(ids, 2);
    return n == 1;          // only us attached -> the window closes when we exit
}
static void conApplyColors() {
    if (!conAttached()) return;
    std::cout.flush();                       // buffered text must land first
    WORD d = conDefaultAttr();
    WORD fg = (WORD)((g_conFg < 0) ? (WORD)(d & 0x0F) : (WORD)g_conFg);
    WORD bg = (WORD)((g_conBg < 0) ? (WORD)((d >> 4) & 0x0F) : (WORD)g_conBg);
    SetConsoleTextAttribute(conOutH(), (WORD)(fg | (WORD)(bg << 4)));
}
static void conResetColors() {
    g_conFg = -1; g_conBg = -1;
    if (!conAttached()) return;
    std::cout.flush();
    SetConsoleTextAttribute(conOutH(), conDefaultAttr());
}
static void conCls() {
    if (!conAttached()) return;
    std::cout.flush();
    HANDLE h = conOutH();
    CONSOLE_SCREEN_BUFFER_INFO info;
    if (!GetConsoleScreenBufferInfo(h, &info)) return;
    DWORD cells = (DWORD)info.dwSize.X * (DWORD)info.dwSize.Y;
    COORD home = {0, 0};
    DWORD done = 0;
    FillConsoleOutputCharacterW(h, L' ', cells, home, &done);
    FillConsoleOutputAttribute(h, info.wAttributes, cells, home, &done);
    SetConsoleCursorPosition(h, home);
}
static void conClearLine() {
    if (!conAttached()) return;
    std::cout.flush();
    HANDLE h = conOutH();
    CONSOLE_SCREEN_BUFFER_INFO info;
    if (!GetConsoleScreenBufferInfo(h, &info)) return;
    COORD start = {0, info.dwCursorPosition.Y};
    DWORD done = 0;
    FillConsoleOutputCharacterW(h, L' ', (DWORD)info.dwSize.X, start, &done);
    FillConsoleOutputAttribute(h, info.wAttributes, (DWORD)info.dwSize.X, start, &done);
    SetConsoleCursorPosition(h, start);
}
static void conMoveTo(int x, int y) {
    if (!conAttached()) return;
    std::cout.flush();
    if (x < 0) x = 0;
    if (y < 0) y = 0;
    COORD c = {(SHORT)x, (SHORT)y};
    SetConsoleCursorPosition(conOutH(), c);
}
static bool conGetCursor(int& x, int& y) {
    CONSOLE_SCREEN_BUFFER_INFO info;
    if (!GetConsoleScreenBufferInfo(conOutH(), &info)) return false;
    std::cout.flush();
    x = info.dwCursorPosition.X;
    y = info.dwCursorPosition.Y;
    return true;
}
static void conGetSize(int& cols, int& rows) {
    cols = 80; rows = 25;
    CONSOLE_SCREEN_BUFFER_INFO info;
    if (GetConsoleScreenBufferInfo(conOutH(), &info)) {
        cols = info.srWindow.Right - info.srWindow.Left + 1;
        rows = info.srWindow.Bottom - info.srWindow.Top + 1;
    }
}
static void conShowCursor(bool visible) {
    if (!conAttached()) return;
    std::cout.flush();
    CONSOLE_CURSOR_INFO ci;
    if (!GetConsoleCursorInfo(conOutH(), &ci)) return;
    ci.bVisible = visible ? TRUE : FALSE;
    SetConsoleCursorInfo(conOutH(), &ci);
}
static void conSetTitle(const std::string& t) {
    SetConsoleTitleW(utf8ToWide(t).c_str());
}
static std::string conGetTitle() {
    wchar_t buf[512];
    DWORD n = GetConsoleTitleW(buf, (DWORD)(sizeof(buf) / sizeof(buf[0])));
    if (n == 0) return std::string();
    return wideToUtf8(buf, (int)n);
}
static std::string conVkName(WORD vk) {
    switch (vk) {
        case VK_RETURN: return "{ENTER}";
        case VK_TAB:    return "{TAB}";
        case VK_ESCAPE: return "{ESC}";
        case VK_BACK:   return "{BACKSPACE}";
        case VK_DELETE: return "{DELETE}";
        case VK_INSERT: return "{INSERT}";
        case VK_HOME:   return "{HOME}";
        case VK_END:    return "{END}";
        case VK_PRIOR:  return "{PGUP}";
        case VK_NEXT:   return "{PGDN}";
        case VK_UP:     return "{UP}";
        case VK_DOWN:   return "{DOWN}";
        case VK_LEFT:   return "{LEFT}";
        case VK_RIGHT:  return "{RIGHT}";
        default: break;
    }
    if (vk >= VK_F1 && vk <= VK_F24) return conFnName((int)(vk - VK_F1) + 1);
    return std::string();
}
// One keypress, no Enter needed. Opens CONIN$ explicitly so it still works when
// stdin itself has been redirected.
static std::string conReadKey() {
    HANDLE h = CreateFileA("CONIN$", GENERIC_READ | GENERIC_WRITE,
                           FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr,
                           OPEN_EXISTING, 0, nullptr);
    if (h == INVALID_HANDLE_VALUE) return std::string();
    DWORD oldMode = 0;
    bool hadMode = GetConsoleMode(h, &oldMode) != 0;
    if (hadMode) SetConsoleMode(h, 0);          // raw: no line editing, no echo
    FlushConsoleInputBuffer(h);
    std::string out;
    for (;;) {
        INPUT_RECORD ir;
        DWORD n = 0;
        if (!ReadConsoleInputW(h, &ir, 1, &n) || n == 0) break;
        if (ir.EventType != KEY_EVENT || !ir.Event.KeyEvent.bKeyDown) continue;
        WORD vk = ir.Event.KeyEvent.wVirtualKeyCode;
        if (vk == VK_SHIFT || vk == VK_CONTROL || vk == VK_MENU || vk == VK_CAPITAL ||
            vk == VK_NUMLOCK || vk == VK_SCROLL || vk == VK_LWIN || vk == VK_RWIN) continue;
        std::string named = conVkName(vk);
        if (!named.empty()) { out = named; break; }
        wchar_t wc = ir.Event.KeyEvent.uChar.UnicodeChar;
        if (wc >= 1 && wc <= 26) { out = conCtrlName((unsigned char)wc); break; }
        if (wc) { out = wideToUtf8(&wc, 1); break; }
    }
    if (hadMode) SetConsoleMode(h, oldMode);
    CloseHandle(h);
    return out;
}
#else
static ObjectPtr createComObject(const std::string&, bool& ok) { ok = false; return nullptr; }
static ObjectPtr makeMouseObj()  { raiseErr(429, "Mouse control requires the Windows build of Directive"); }
static ObjectPtr makeScreenObj() { raiseErr(429, "Screen/pixel access requires the Windows build of Directive"); }
static ObjectPtr makeKeyboardObj(){ raiseErr(429, "Keyboard input requires the Windows build of Directive"); }
static ObjectPtr makeClipboardObj(){ raiseErr(429, "Clipboard access requires the Windows build of Directive"); }
// Sound: WAV combining (in SoundObject) is cross-platform; playback is Windows-only.
static bool soundPlay(const std::string&, bool) { raiseErr(429, "Sound.Play requires the Windows build of Directive"); }
static void soundStop() { raiseErr(429, "Sound.Stop requires the Windows build of Directive"); }
static void soundBeep(int, int) { raiseErr(429, "Sound.Beep requires the Windows build of Directive"); }
[[maybe_unused]] static bool clipboardSet(const std::string&) { raiseErr(429, "Clipboard.Set requires the Windows build of Directive"); }
[[maybe_unused]] static bool clipboardGet(std::string&)       { raiseErr(429, "Clipboard.Get requires the Windows build of Directive"); }
[[maybe_unused]] static void clipboardClear()                 { raiseErr(429, "Clipboard.Clear requires the Windows build of Directive"); }
// Shell: process/env helpers are cross-platform (defined earlier); registry,
// special-folder, shortcut, and window helpers are Windows-only.
static std::vector<std::string> shellEnvStrings() {
    std::vector<std::string> v;
    for (char** e = environ; e && *e; ++e) v.push_back(*e);
    return v;
}
static std::string shellRegRead(const std::string&)  { raiseErr(429, "RegRead requires the Windows build of Directive"); }
static void shellRegWrite(const std::string&, const Value&, const std::string&) { raiseErr(429, "RegWrite requires the Windows build of Directive"); }
static void shellRegDelete(const std::string&) { raiseErr(429, "RegDelete requires the Windows build of Directive"); }
static std::string shellSpecialFolder(const std::string&) { raiseErr(429, "SpecialFolders requires the Windows build of Directive"); }
static ObjectPtr shellMakeShortcut(const std::string&) { raiseErr(429, "CreateShortcut requires the Windows build of Directive"); }
static bool shellAppActivate(const std::string&) { raiseErr(429, "AppActivate requires the Windows build of Directive"); }

// ---- locale (POSIX: a table, so cross-platform behaviour stays predictable)
static void localeApply(int lcid) {
    struct Row { int lcid; const char* dec; const char* thou; const char* cur; int curPos; bool dayFirst; };
    static const Row rows[] = {
        {1033, ".", ",", "$",  0, false},   // en-US
        {2057, ".", ",", "\xC2\xA3", 0, true},  // en-GB
        {2067, ",", ".", "\xE2\x82\xAC", 2, true},  // nl-BE
        {1043, ",", ".", "\xE2\x82\xAC", 2, true},  // nl-NL
        {1031, ",", ".", "\xE2\x82\xAC", 2, true}, // de-DE
        {1036, ",", " ", "\xE2\x82\xAC", 2, true}, // fr-FR
        {1040, ",", ".", "\xE2\x82\xAC", 2, true},  // it-IT
        {3082, ",", ".", "\xE2\x82\xAC", 2, true}, // es-ES
    };
    int want = lcid ? lcid : 1033;              // no OS locale to consult here
    for (const auto& r : rows) {
        if (r.lcid == want) {
            g_loc.lcid = want; g_loc.decimalSep = r.dec; g_loc.thousandsSep = r.thou;
            g_loc.currencySym = r.cur; g_loc.currencyPos = r.curPos; g_loc.dayFirst = r.dayFirst;
            return;
        }
    }
    raiseErr(5, "SetLocale: unsupported locale id on this platform");
}
static std::string osFormatDate(int y, int mo, int d) {
    char b[32];
    if (g_loc.dayFirst) std::snprintf(b, 32, "%d/%02d/%04d", d, mo, y);
    else                std::snprintf(b, 32, "%d/%d/%04d", mo, d, y);
    return b;
}
static std::string osFormatTime(int h, int mi, int se) {
    char b[32]; std::snprintf(b, 32, "%02d:%02d:%02d", h, mi, se); return b;
}
static std::string osFormatTimeShort(int h, int mi) {
    char b[16]; std::snprintf(b, 16, "%02d:%02d", h, mi); return b;
}
// No OS locale to consult here, so the English tables; Windows asks the OS.
static std::string osMonthName(int mo, bool abbrev) {
    if (mo < 1 || mo > 12) return "";
    std::string m = kMonths[mo - 1];
    return abbrev ? m.substr(0, 3) : m;
}
static std::string osDayName(int idx, bool abbrev) {
    if (idx < 0 || idx > 6) return "";
    std::string d = kDays[idx];
    return abbrev ? d.substr(0, 3) : d;
}
static std::string osFormatDateLong(int y, int mo, int d) {
    // No OS locale to consult here, so English month names; the Windows build asks
    // GetDateFormatW and therefore matches whatever the machine is set to.
    char b[64];
    std::snprintf(b, 64, "%s %d, %04d", (mo >= 1 && mo <= 12) ? kMonths[mo - 1] : "?", d, y);
    return b;
}

// TextWindow is a desktop window, so the POSIX build reports rather than pretends.
[[noreturn]] static void twUnavailable() {
    raiseErr(429, "TextWindow requires the Windows build of Directive");
}
static void* twOpen(const TwOpts&)                 { twUnavailable(); }
static void  twWrite(void*, const std::string&)    { twUnavailable(); }
static std::string twGetText(void*)                { twUnavailable(); }
static void  twSetText(void*, const std::string&)  { twUnavailable(); }
static void  twClear(void*)                        { twUnavailable(); }
static std::string twGetInput(void*)               { twUnavailable(); }
static void  twSetInput(void*, const std::string&) { twUnavailable(); }
static void  twClearInput(void*)                   { twUnavailable(); }
static bool  twHasInput(void*)                     { twUnavailable(); }
static bool  twReadLine(void*, std::string&)       { twUnavailable(); }
static bool  twReadAll(void*, std::string&)        { twUnavailable(); }
static void  twShow(void*, int)                    { twUnavailable(); }
static void  twActivate(void*)                     { twUnavailable(); }
static void  twClose(void*)                        { twUnavailable(); }
static bool  twIsClosed(void*)                     { return true; }
static bool  twIsVisible(void*)                    { return false; }
static void  twWaitForClose(void*)                 { twUnavailable(); }
static void  twSetTitle(void*, const std::string&) { twUnavailable(); }
static void  twSetSize(void*, int, int)            { twUnavailable(); }
static void  twSetFont(void*, const std::string&, int) { twUnavailable(); }
static void  twSetWrap(void*, bool)                { twUnavailable(); }
static void  twSetShowInput(void*, bool)           { twUnavailable(); }
static void  twSetEcho(void*, bool)                { twUnavailable(); }
static void  twSetSubmitEnter(void*, bool)         { twUnavailable(); }
static bool  twGetFlag(void*, int)                 { twUnavailable(); }
static void  twDestroy(void*)                      { }

static std::string hostExePath() {
    char buf[4096];
    ssize_t n = ::readlink("/proc/self/exe", buf, sizeof(buf) - 1);
    if (n <= 0) return std::string();
    buf[n] = '\0';
    return std::string(buf);
}
static void dirSleepMs(long long ms) {
    if (ms <= 0) return;
    struct timespec ts;
    ts.tv_sec  = (time_t)(ms / 1000);
    ts.tv_nsec = (long)((ms % 1000) * 1000000L);
    while (nanosleep(&ts, &ts) == -1 && errno == EINTR) { }
}

// ---- Console control (POSIX: ANSI/VT escapes + termios) ----------------------
// Windows console attribute numbers (1=blue, 2=green, 4=red) are not the ANSI
// order (1=red, 2=green, 4=blue), so translate through this table.
static const int kAnsiFromWinColor[8] = {0, 4, 2, 6, 1, 5, 3, 7};
static std::string g_conTitle;

static bool conAttached() { return isatty(STDOUT_FILENO) != 0; }

static bool conCanReadKeys() { return isatty(STDIN_FILENO) != 0; }

// A terminal emulator's window belongs to the shell, not to us, so there is
// nothing to keep open: KeepOpen is a no-op on POSIX by design.
static bool conOwnsWindow() { return false; }

static void conApplyColors() {
    if (!conAttached()) return;
    if (g_conFg < 0 && g_conBg < 0) { std::cout << "\033[0m" << std::flush; return; }
    std::string seq = "\033[";
    bool first = true;
    if (g_conFg >= 0) {
        int base = (g_conFg & 8) ? 90 : 30;
        seq += std::to_string(base + kAnsiFromWinColor[g_conFg & 7]);
        first = false;
    }
    if (g_conBg >= 0) {
        if (!first) seq += ";";
        int base = (g_conBg & 8) ? 100 : 40;
        seq += std::to_string(base + kAnsiFromWinColor[g_conBg & 7]);
    }
    seq += "m";
    std::cout << seq << std::flush;
}
static void conResetColors() {
    g_conFg = -1; g_conBg = -1;
    if (conAttached()) std::cout << "\033[0m" << std::flush;
}
static void conCls() {
    if (!conAttached()) return;
    std::cout << "\033[2J\033[H" << std::flush;
}
static void conClearLine() {
    if (!conAttached()) return;
    std::cout << "\r\033[2K" << std::flush;
}
static void conMoveTo(int x, int y) {
    if (!conAttached()) return;
    if (x < 0) x = 0;
    if (y < 0) y = 0;
    std::cout << "\033[" << (y + 1) << ";" << (x + 1) << "H" << std::flush;   // ANSI is 1-based
}
static void conGetSize(int& cols, int& rows) {
    cols = 80; rows = 25;
    struct winsize ws;
    if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0 && ws.ws_col > 0) {
        cols = (int)ws.ws_col;
        rows = (int)ws.ws_row;
    }
}
static void conShowCursor(bool visible) {
    if (!conAttached()) return;
    std::cout << (visible ? "\033[?25h" : "\033[?25l") << std::flush;
}
static void conSetTitle(const std::string& t) {
    g_conTitle = t;
    if (conAttached()) std::cout << "\033]0;" << t << "\a" << std::flush;
}
// Terminals give no way to read the title back, so report what we last set.
static std::string conGetTitle() { return g_conTitle; }

// Open the controlling terminal for key input even if stdin was redirected.
static int conTtyFd(bool& needClose) {
    needClose = false;
    if (isatty(STDIN_FILENO)) return STDIN_FILENO;
    int fd = ::open("/dev/tty", O_RDONLY);
    if (fd >= 0) { needClose = true; return fd; }
    return -1;
}
static std::string conAnsiSeqName(const char* seq, int n) {
    if (n <= 0) return "{ESC}";
    std::string s(seq, (size_t)n);
    if (s == "[A") return "{UP}";
    if (s == "[B") return "{DOWN}";
    if (s == "[C") return "{RIGHT}";
    if (s == "[D") return "{LEFT}";
    if (s == "[H" || s == "[1~" || s == "OH") return "{HOME}";
    if (s == "[F" || s == "[4~" || s == "OF") return "{END}";
    if (s == "[2~") return "{INSERT}";
    if (s == "[3~") return "{DELETE}";
    if (s == "[5~") return "{PGUP}";
    if (s == "[6~") return "{PGDN}";
    static const struct { const char* seq; int fn; } fkeys[] = {
        {"OP", 1}, {"OQ", 2}, {"OR", 3}, {"OS", 4}, {"[15~", 5}, {"[17~", 6},
        {"[18~", 7}, {"[19~", 8}, {"[20~", 9}, {"[21~", 10}, {"[23~", 11}, {"[24~", 12},
    };
    for (const auto& f : fkeys) if (s == f.seq) return conFnName(f.fn);
    return "{ESC}";
}
static std::string conReadKey() {
    bool needClose = false;
    int fd = conTtyFd(needClose);
    if (fd < 0) return std::string();
    struct termios oldt, raw;
    if (tcgetattr(fd, &oldt) != 0) { if (needClose) ::close(fd); return std::string(); }
    raw = oldt;
    raw.c_lflag &= (tcflag_t)~(ICANON | ECHO);
    raw.c_cc[VMIN] = 1;
    raw.c_cc[VTIME] = 0;
    tcsetattr(fd, TCSANOW, &raw);
    std::string out;
    unsigned char c = 0;
    if (::read(fd, &c, 1) == 1) {
        if (c == 0x1b) {                       // escape: grab the rest of the sequence
            struct termios peek = raw;
            peek.c_cc[VMIN] = 0;
            peek.c_cc[VTIME] = 1;              // 100 ms, enough for a local terminal
            tcsetattr(fd, TCSANOW, &peek);
            char seq[8];
            ssize_t got = ::read(fd, seq, sizeof(seq));
            out = conAnsiSeqName(seq, (int)got);
        } else if (c == '\r' || c == '\n') out = "{ENTER}";
        else if (c == '\t')                out = "{TAB}";
        else if (c == 0x7f || c == 0x08)   out = "{BACKSPACE}";
        else if (c >= 1 && c <= 26)        out = conCtrlName(c);
        else if (c < 32)                   out = "{ESC}";
        else if (c < 0x80)                 out = std::string(1, (char)c);
        else {
            // UTF-8 lead byte: pull in the continuation bytes so emoji and
            // accented characters come back as one whole character.
            int extra = (c >= 0xF0) ? 3 : (c >= 0xE0) ? 2 : 1;
            out = std::string(1, (char)c);
            struct termios peek = raw;
            peek.c_cc[VMIN] = 0;
            peek.c_cc[VTIME] = 1;
            tcsetattr(fd, TCSANOW, &peek);
            char more[4];
            ssize_t got = ::read(fd, more, (size_t)extra);
            if (got > 0) out.append(more, (size_t)got);
        }
    }
    tcsetattr(fd, TCSANOW, &oldt);
    if (needClose) ::close(fd);
    return out;
}
// Ask the terminal where the cursor is (ESC[6n) and parse the ESC[row;colR reply.
static bool conGetCursor(int& x, int& y) {
    if (!conAttached()) return false;
    bool needClose = false;
    int fd = conTtyFd(needClose);
    if (fd < 0) return false;
    struct termios oldt, raw;
    if (tcgetattr(fd, &oldt) != 0) { if (needClose) ::close(fd); return false; }
    raw = oldt;
    raw.c_lflag &= (tcflag_t)~(ICANON | ECHO);
    raw.c_cc[VMIN] = 0;
    raw.c_cc[VTIME] = 2;                     // 200 ms cap, never blocks forever
    tcsetattr(fd, TCSANOW, &raw);
    std::cout << "\033[6n" << std::flush;
    std::string reply;
    char ch = 0;
    while (reply.size() < 32 && ::read(fd, &ch, 1) == 1) {
        reply += ch;
        if (ch == 'R') break;
    }
    tcsetattr(fd, TCSANOW, &oldt);
    if (needClose) ::close(fd);
    int row = 0, col = 0;
    if (std::sscanf(reply.c_str(), "\033[%d;%dR", &row, &col) == 2) {
        x = col - 1;                          // ANSI is 1-based, Directive is 0-based
        y = row - 1;
        return true;
    }
    return false;
}
#endif

// ============================================================================ MAIN
static std::string readAll(std::istream& in) {
    std::ostringstream ss; ss << in.rdbuf(); return ss.str();
}

// ---------------------------------------------------------------- ui layer impl
#if !defined(_WIN32)
// ---- non-Windows: no native dialogs, so everything goes through stdio ----
namespace ui {
    void echo(const std::string& t) { std::cout << t << "\n"; }
    long msgBox(const std::string& p, long, const std::string& title) {
        if (!title.empty()) std::cout << "[" << title << "] ";
        std::cout << p << "\n";
        return 1;   // OK (a console can't offer other buttons without prompting)
    }
    bool inputBox(const std::string& p, const std::string& title, const std::string& def, std::string& out) {
        if (!title.empty()) std::cerr << "[" << title << "] ";
        std::cerr << p << " ";
        if (!std::getline(std::cin, out)) out = def;
        return true;
    }
    void error(const std::string& t) { std::cerr << t << "\n"; }
}
#else
// ============================ Windows ============================
// MsgBox and InputBox are real GUI dialogs under BOTH builds — they're interactive
// functions, independent of console vs GUI mode. Only Echo and the StdOut/StdErr
// streams are build-specific:
//   directive.exe  (console)  -> Echo/StdOut go to the console
//   directivew.exe (GUI)      -> StdOut still goes to a parent console when one is
//                                attached (see WinMain); Echo goes to that console
//                                if present, otherwise pops up a dialog
#ifdef DIRECTIVE_GUI
bool g_hasConsole = false;   // set by WinMain when launched from a console
#endif
namespace ui {
    static std::wstring toW(const std::string& s) { return utf8ToWide(s); }

    // ---- MsgBox / InputBox: always real dialogs on Windows ----
    long msgBox(const std::string& p, long flags, const std::string& title) {
        std::wstring wp = toW(p);
        std::wstring wt = toW(title.empty() ? std::string("Directive") : title);
        // MessageBox return values (IDOK=1..IDNO=7) equal the Directive dsOK..dsNo codes.
        return MessageBoxW(NULL, wp.c_str(), wt.c_str(), (UINT)flags | MB_SETFOREGROUND);
    }

    // InputBox uses an in-memory dialog template so the dialog manager handles
    // Tab / Enter / Esc / focus for us.
    struct InputCtx { std::wstring text; bool ok; };
    static const WORD ID_EDIT = 1000;

    static INT_PTR CALLBACK inputProc(HWND h, UINT m, WPARAM w, LPARAM l) {
        if (m == WM_INITDIALOG) {
            InputCtx* c = (InputCtx*)l;
            SetWindowLongPtrW(h, GWLP_USERDATA, (LONG_PTR)c);
            SetDlgItemTextW(h, ID_EDIT, c->text.c_str());
            HWND e = GetDlgItem(h, ID_EDIT);
            SetFocus(e); SendMessageW(e, EM_SETSEL, 0, -1);
            return FALSE;   // we set focus ourselves
        }
        if (m == WM_COMMAND) {
            InputCtx* c = (InputCtx*)GetWindowLongPtrW(h, GWLP_USERDATA);
            WORD id = LOWORD(w);
            if (id == IDOK) {
                wchar_t buf[8192]; GetDlgItemTextW(h, ID_EDIT, buf, 8192);
                if (c) { c->text = buf; c->ok = true; }
                EndDialog(h, IDOK); return TRUE;
            }
            if (id == IDCANCEL) { if (c) c->ok = false; EndDialog(h, IDCANCEL); return TRUE; }
        }
        return FALSE;
    }

    static void alignDword(std::vector<BYTE>& b) { while (b.size() & 3) b.push_back(0); }
    static void putW(std::vector<BYTE>& b, WORD v) { b.push_back((BYTE)(v & 0xFF)); b.push_back((BYTE)(v >> 8)); }
    static void putD(std::vector<BYTE>& b, DWORD v) { for (int i = 0; i < 4; i++) b.push_back((BYTE)((v >> (8 * i)) & 0xFF)); }
    static void putStr(std::vector<BYTE>& b, const wchar_t* s) { for (; *s; ++s) putW(b, (WORD)*s); putW(b, 0); }
    static void addItem(std::vector<BYTE>& b, DWORD style, short x, short y, short cx, short cy,
                        WORD id, WORD atom, const wchar_t* text) {
        alignDword(b);
        putD(b, style | WS_CHILD | WS_VISIBLE);
        putD(b, 0);                                   // exStyle
        putW(b, (WORD)x); putW(b, (WORD)y); putW(b, (WORD)cx); putW(b, (WORD)cy);
        putW(b, id);
        putW(b, 0xFFFF); putW(b, atom);               // predefined control class
        putStr(b, text);                              // caption
        putW(b, 0);                                   // no creation data
    }

    bool inputBox(const std::string& prompt, const std::string& title, const std::string& def, std::string& out) {
        InputCtx c; c.text = toW(def); c.ok = false;
        std::wstring wCaption = toW(title.empty() ? std::string("Directive") : title);
        std::wstring wPrompt  = toW(prompt);

        std::vector<BYTE> t;
        putD(t, DS_MODALFRAME | DS_SETFONT | DS_CENTER | WS_POPUP | WS_CAPTION | WS_SYSMENU);
        putD(t, 0);                                   // exStyle
        putW(t, 4);                                   // number of controls
        putW(t, 0); putW(t, 0);                       // x, y
        putW(t, 240); putW(t, 100);                   // cx, cy (dialog units)
        putW(t, 0);                                   // no menu
        putW(t, 0);                                   // default dialog class
        putStr(t, wCaption.c_str());                  // caption
        putW(t, 8); putStr(t, L"MS Shell Dlg");       // DS_SETFONT: size + face

        addItem(t, SS_LEFT,                                7,  7, 226, 40, (WORD)-1, 0x0082, wPrompt.c_str()); // static
        addItem(t, ES_AUTOHSCROLL | WS_BORDER | WS_TABSTOP, 7, 50, 226, 14, ID_EDIT,  0x0081, L"");            // edit
        addItem(t, BS_DEFPUSHBUTTON | WS_TABSTOP,          128, 74, 50, 16, IDOK,     0x0080, L"OK");
        addItem(t, BS_PUSHBUTTON | WS_TABSTOP,             183, 74, 50, 16, IDCANCEL, 0x0080, L"Cancel");

        INT_PTR r = DialogBoxIndirectParamW(GetModuleHandleW(NULL), (LPCDLGTEMPLATEW)t.data(),
                                            NULL, inputProc, (LPARAM)&c);
        if (r == IDOK && c.ok) { out = wideToUtf8(c.text.c_str(), (int)c.text.size()); return true; }
        out.clear();
        return false;
    }

    // ---- Echo / error: host-specific ----
#ifdef DIRECTIVE_GUI
    // GUI build (directivew.exe): console when attached, else a dialog.
    void echo(const std::string& t) {
        if (g_hasConsole) { std::cout << t << "\n"; std::cout.flush(); }
        else { std::wstring w = toW(t); MessageBoxW(NULL, w.c_str(), L"Directive", MB_OK | MB_SETFOREGROUND); }
    }
    void error(const std::string& t) {
        if (g_hasConsole) { std::cerr << t << "\n"; std::cerr.flush(); }
        else { std::wstring w = toW(t); MessageBoxW(NULL, w.c_str(), L"Directive error", MB_OK | MB_ICONERROR | MB_SETFOREGROUND); }
    }
#else
    // Console build (directive.exe): straight to stdio.
    void echo(const std::string& t)  { std::cout << t << "\n"; }
    void error(const std::string& t) { std::cerr << t << "\n"; }
#endif
}

#endif

// ---------------------------------------------------------------- driver
static int runMain(int argc, char** argv) {
#ifdef _WIN32
    CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED);
#endif
    localeApply(0);          // adopt the machine's locale, as VBScript does
    g_hostExe = hostExePath();
    if (g_hostExe.empty() && argc > 0) g_hostExe = argv[0];
    std::string source, path;
    bool inline_mode = false;
    bool haveSource = false;                 // set once the script (file, -e, or stdin) is determined
    std::vector<std::string> scriptArgs;     // everything after the script becomes Directive.Arguments

    for (int i = 1; i < argc; ++i) {
        std::string arg = argv[i];
        if (!haveSource && (arg == "-e" || arg == "--eval")) {
            if (i + 1 < argc) { source = argv[++i]; inline_mode = true; haveSource = true; }
            else { ui::error("directive: -e requires an argument"); return 2; }
        } else if (!haveSource && (arg == "-h" || arg == "--help")) {
            ui::echo("Directive (Open Directive) - a dynamic scripting language\n"
                     "Usage:\n"
                     "  directive <script.ds> [args...]   run a script file\n"
                     "  directive -e \"code\" [args...]            run an inline snippet\n"
                     "  directive - [args...]                    read script from stdin\n"
                     "\n"
                     "Any arguments after the script are readable from the script via\n"
                     "Directive.Arguments (0-based): Directive.Arguments.Count,\n"
                     "Directive.Arguments(0), and 'For Each a In Directive.Arguments'.");
            return 0;
        } else if (!haveSource && arg == "-") {
            source = readAll(std::cin); inline_mode = true; haveSource = true;
        } else if (!haveSource) {
            path = arg; haveSource = true;
        } else {
            scriptArgs.push_back(arg);       // positional (or flag-looking) arg belonging to the script
        }
    }

    if (!inline_mode) {
        if (path.empty()) { ui::error("directive: no input. Try 'directive --help'."); return 2; }
        std::ifstream f(path, std::ios::binary);
        if (!f) { ui::error("directive: cannot open file: " + path); return 2; }
        source = readAll(f);
    }

    // strip UTF-8 BOM if present
    if (source.size() >= 3 && (unsigned char)source[0] == 0xEF &&
        (unsigned char)source[1] == 0xBB && (unsigned char)source[2] == 0xBF)
        source = source.substr(3);

    int rc = 0;
    Interpreter interp;

    // Resolve the script directory (used for Include path resolution and Directive.ScriptPath).
    std::string baseDir, fullPath;
    auto included = std::make_shared<std::set<std::string>>();
    {
        std::error_code ec;
        if (!inline_mode && !path.empty()) {
            fs::path canon = fs::weakly_canonical(path, ec);
            if (ec || canon.empty()) canon = fs::absolute(path, ec);
            fullPath = canon.string();
            included->insert(fullPath);                 // guard: the main file can't be re-included
            baseDir = canon.parent_path().string();
        }
        if (baseDir.empty()) baseDir = fs::current_path(ec).string();
    }
    interp.setScriptInfo(fullPath, baseDir);
    interp.setArguments(scriptArgs);

    try {
        Lexer lexer(source);
        Parser parser(lexer.tokenize(), baseDir, included);
        std::vector<StmtP> program = parser.parseProgram();
        interp.run(program);
    } catch (QuitSignal& q) {
        rc = q.code;
    } catch (ExitSignal&) {
        rc = 0;   // stray Exit at top level: ignore
    } catch (DirectiveError& e) {
        // Report in the same shape as the Windows Script Host dialog:
        // Script / Line / Char / Error / Code / Source.
        long ln  = e.line ? e.line : interp.errorLine();
        long col = e.col  ? e.col  : interp.errorCol();
        unsigned hres = (e.number & 0xFFFF0000L)
                        ? (unsigned)e.number                              // already a full HRESULT (e.g. Err.Raise)
                        : (0x800A0000u | (unsigned)(e.number & 0xFFFF));  // standard code -> 800Axxxx
        char code[16]; std::snprintf(code, sizeof(code), "%08X", hres);
        std::ostringstream m;
        m << "Script:\t" << (fullPath.empty() ? "(inline script)" : fullPath) << "\n"
          << "Line:\t"   << (ln  > 0 ? std::to_string(ln)  : std::string("1")) << "\n"
          << "Char:\t"   << (col > 0 ? std::to_string(col) : std::string("1")) << "\n"
          << "Error:\t"  << e.description << "\n"
          << "Code:\t"   << code << "\n"
          << "Source:\t" << (e.source.empty() ? "Directive runtime error" : e.source);
        ui::error(m.str());
        rc = 1;
    } catch (const std::exception& e) {
        ui::error(std::string("Directive internal error: ") + e.what());
        rc = 70;
    }

#ifdef _WIN32
    CoUninitialize();
#endif
    return rc;
}

// Console entry point (default build, and all non-Windows builds).
int main(int argc, char** argv) {
    return runMain(argc, argv);
}

#if defined(_WIN32) && defined(DIRECTIVE_GUI)
// GUI entry point: no console window. Build with -DDIRECTIVE_GUI and a windowed
// subsystem (MSVC: /link /SUBSYSTEM:WINDOWS ; MinGW: -mwindows). Using the ANSI
// WinMain means no -municode is required; we still read the Unicode command line.
int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int) {
    // If we were launched from a console (cmd), attach to it so Directive.StdOut /
    // .StdIn work there. If double-clicked, there's no parent console (that's fine).
    if (AttachConsole(ATTACH_PARENT_PROCESS)) {
        g_hasConsole = true;
#ifdef _MSC_VER
        FILE* f;
        freopen_s(&f, "CONOUT$", "w", stdout);
        freopen_s(&f, "CONOUT$", "w", stderr);
        freopen_s(&f, "CONIN$",  "r", stdin);
#else
        (void)!freopen("CONOUT$", "w", stdout);
        (void)!freopen("CONOUT$", "w", stderr);
        (void)!freopen("CONIN$",  "r", stdin);
#endif
        // A GUI process attached to a console is fully buffered and would only flush
        // at exit; make it unbuffered so Echo / StdOut appear as the script runs.
        setvbuf(stdout, nullptr, _IONBF, 0);
        setvbuf(stderr, nullptr, _IONBF, 0);
        std::ios::sync_with_stdio(true);
    }
    int argc = 0;
    LPWSTR* wargv = CommandLineToArgvW(GetCommandLineW(), &argc);
    std::vector<std::string> args;
    for (int i = 0; i < argc; ++i) args.push_back(wideToUtf8(wargv[i], lstrlenW(wargv[i])));
    if (wargv) LocalFree(wargv);
    std::vector<char*> argp;
    for (auto& a : args) argp.push_back(&a[0]);
    return runMain((int)argp.size(), argp.empty() ? nullptr : argp.data());
}
#endif