Add remaining logical functions: and, bool, false, true, not, or

Author: SteveL-MSFT

dsc/tests/dsc_expressions.tests.ps1

@@ -107,4 +107,35 @@ resources:
       $LASTEXITCODE | Should -Be 0
       $out.results[0].result[1].result.actualState.output.family | Should -BeExactly $out.results[0].result[0].result.actualState.family
     }
+
+    It 'Logical functions work: <expression>' -TestCases @(
+        @{ expression = "[equals('a', 'a')]"; expected = $true }
+        @{ expression = "[equals('a', 'b')]"; expected = $false }
+        @{ expression = "[not(equals('a', 'b'))]"; expected = $true }
+        @{ expression = "[and(true, true)]"; expected = $true }
+        @{ expression = "[and(true, false)]"; expected = $false }
+        @{ expression = "[or(false, true)]"; expected = $true }
+        @{ expression = "[or(false, false)]"; expected = $false }
+        @{ expression = "[not(true)]"; expected = $false }
+        @{ expression = "[not(or(true, false))]"; expected = $false }
+        @{ expression = "[bool('TRUE')]" ; expected = $true }
+        @{ expression = "[bool('False')]" ; expected = $false }
+        @{ expression = "[bool(1)]" ; expected = $true }
+        @{ expression = "[not(bool(0))]" ; expected = $true }
+        @{ expression = "[true()]" ; expected = $true }
+        @{ expression = "[false()]" ; expected = $false }
+    ) {
+        param($expression, $expected)
+        $yaml = @"
+`$schema: https://aka.ms/dsc/schemas/v3/bundled/config/document.json
+resources:
+- name: echo
+  type: Microsoft.DSC.Debug/Echo
+  properties:
+    output: "$expression"
+"@
+        $out = dsc config get -i $yaml 2>$TestDrive/error.log | ConvertFrom-Json
+        $LASTEXITCODE | Should -Be 0 -Because (Get-Content $TestDrive/error.log -Raw | Out-String)
+        $out.results[0].result.actualState.output | Should -Be $expected -Because ($out | ConvertTo-Json -Depth 10| Out-String)
+    }
 }

dsc_lib/locales/en-us.toml

@@ -204,9 +204,17 @@ noStringArgs = "Function '%{name}' does not accept string arguments, accepted ty
 description = "Adds two or more numbers together"
 invoked = "add function"
 
+[functions.and]
+description = "Evaluates if all arguments are true"
+invoked = "and function"
+
 [functions.base64]
 description = "Encodes a string to Base64 format"
 
+[functions.bool]
+description = "Converts a string or number to a boolean"
+invoked = "bool function"
+
 [functions.concat]
 description = "Concatenates two or more strings or arrays"
 invoked = "concat function"
@@ -234,6 +242,10 @@ notFound = "Environment variable not found"
 [functions.equals]
 description = "Evaluates if the two values are the same"
 
+[functions.false]
+description = "Returns the boolean value false"
+invoked = "false function"
+
 [functions.format]
 description = "Formats a string using the given arguments"
 experimental = "`format()` function is experimental"
@@ -274,6 +286,14 @@ divideByZero = "Cannot divide by zero"
 description = "Multiplies two or more numbers together"
 invoked = "mul function"
 
+[functions.not]
+description = "Negates a boolean value"
+invoked = "not function"
+
+[functions.or]
+description = "Evaluates if any arguments are true"
+invoked = "or function"
+
 [functions.parameters]
 description = "Retrieves parameters from the configuration"
 invoked = "parameters function"
@@ -314,6 +334,10 @@ invoked = "sub function"
 description = "Returns the system root path"
 invoked = "systemRoot function"
 
+[functions.true]
+description = "Returns the boolean value true"
+invoked = "true function"
+
 [functions.variables]
 description = "Retrieves the value of a variable"
 invoked = "variables function"

dsc_lib/src/functions/and.rs

@@ -0,0 +1,81 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+use crate::DscError;
+use crate::configure::context::Context;
+use crate::functions::{AcceptedArgKind, Function, FunctionCategory};
+use rust_i18n::t;
+use serde_json::Value;
+use tracing::debug;
+
+#[derive(Debug, Default)]
+pub struct And {}
+
+impl Function for And {
+    fn description(&self) -> String {
+        t!("functions.and.description").to_string()
+    }
+
+    fn category(&self) -> FunctionCategory {
+        FunctionCategory::Logical
+    }
+
+    fn min_args(&self) -> usize {
+        2
+    }
+
+    fn max_args(&self) -> usize {
+        usize::MAX
+    }
+
+    fn accepted_arg_types(&self) -> Vec<AcceptedArgKind> {
+        vec![AcceptedArgKind::Boolean]
+    }
+
+    fn invoke(&self, args: &[Value], _context: &Context) -> Result<Value, DscError> {
+        debug!("{}", t!("functions.and.invoked"));
+        let mut result = true;
+        for arg in args {
+            if let Some(value) = arg.as_bool() {
+                result &= value;
+            } else {
+                return Err(DscError::Parser(t!("functions.invalidArguments").to_string()));
+            }
+        }
+        Ok(Value::Bool(result))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::configure::context::Context;
+    use crate::parser::Statement;
+
+    #[test]
+    fn two_values() {
+        let mut parser = Statement::new().unwrap();
+        let result = parser.parse_and_execute("[and(true, false)]", &Context::new()).unwrap();
+        assert_eq!(result, false);
+    }
+
+    #[test]
+    fn multiple_values() {
+        let mut parser = Statement::new().unwrap();
+        let result = parser.parse_and_execute("[and(true, false, true)]", &Context::new()).unwrap();
+        assert_eq!(result, false);
+    }
+
+    #[test]
+    fn all_false() {
+        let mut parser = Statement::new().unwrap();
+        let result = parser.parse_and_execute("[and(false, false)]", &Context::new()).unwrap();
+        assert_eq!(result, false);
+    }
+
+    #[test]
+    fn all_true() {
+        let mut parser = Statement::new().unwrap();
+        let result = parser.parse_and_execute("[and(true, true)]", &Context::new()).unwrap();
+        assert_eq!(result, true);
+    }
+}

dsc_lib/src/functions/bool.rs

@@ -0,0 +1,83 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+use crate::DscError;
+use crate::configure::context::Context;
+use crate::functions::{AcceptedArgKind, Function, FunctionCategory};
+use rust_i18n::t;
+use serde_json::Value;
+use tracing::debug;
+
+#[derive(Debug, Default)]
+pub struct Bool {}
+
+impl Function for Bool {
+    fn description(&self) -> String {
+        t!("functions.bool.description").to_string()
+    }
+
+    fn category(&self) -> FunctionCategory {
+        FunctionCategory::Logical
+    }
+
+    fn min_args(&self) -> usize {
+        1
+    }
+
+    fn max_args(&self) -> usize {
+        1
+    }
+
+    fn accepted_arg_types(&self) -> Vec<AcceptedArgKind> {
+        vec![AcceptedArgKind::String, AcceptedArgKind::Number]
+    }
+
+    fn invoke(&self, args: &[Value], _context: &Context) -> Result<Value, DscError> {
+        debug!("{}", t!("functions.bool.invoked"));
+        if let Some(arg) = args[0].as_str() {
+            match arg.to_lowercase().as_str() {
+                "true" => Ok(Value::Bool(true)),
+                "false" => Ok(Value::Bool(false)),
+                _ => Err(DscError::Parser(t!("functions.invalidArguments").to_string())),
+            }
+        } else if let Some(num) = args[0].as_i64() {
+            Ok(Value::Bool(num != 0))
+        } else {
+            Err(DscError::Parser(t!("functions.invalidArguments").to_string()))
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::configure::context::Context;
+    use crate::parser::Statement;
+
+    #[test]
+    fn true_string() {
+        let mut parser = Statement::new().unwrap();
+        let result = parser.parse_and_execute("[bool('true')]", &Context::new()).unwrap();
+        assert_eq!(result, true);
+    }
+
+    #[test]
+    fn false_string() {
+        let mut parser = Statement::new().unwrap();
+        let result = parser.parse_and_execute("[bool('false')]", &Context::new()).unwrap();
+        assert_eq!(result, false);
+    }
+
+    #[test]
+    fn number_1() {
+        let mut parser = Statement::new().unwrap();
+        let result = parser.parse_and_execute("[bool(1)]", &Context::new()).unwrap();
+        assert_eq!(result, true);
+    }
+
+    #[test]
+    fn number_0() {
+        let mut parser = Statement::new().unwrap();
+        let result = parser.parse_and_execute("[bool(0)]", &Context::new()).unwrap();
+        assert_eq!(result, false);
+    }
+}

dsc_lib/src/functions/false.rs

@@ -0,0 +1,52 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+use crate::DscError;
+use crate::configure::context::Context;
+use crate::functions::{AcceptedArgKind, Function, FunctionCategory};
+use rust_i18n::t;
+use serde_json::Value;
+use tracing::debug;
+
+#[derive(Debug, Default)]
+pub struct False {}
+
+impl Function for False {
+    fn description(&self) -> String {
+        t!("functions.false.description").to_string()
+    }
+
+    fn category(&self) -> FunctionCategory {
+        FunctionCategory::Logical
+    }
+
+    fn min_args(&self) -> usize {
+        0
+    }
+
+    fn max_args(&self) -> usize {
+        0
+    }
+
+    fn accepted_arg_types(&self) -> Vec<AcceptedArgKind> {
+        vec![]
+    }
+
+    fn invoke(&self, _args: &[Value], _context: &Context) -> Result<Value, DscError> {
+        debug!("{}", t!("functions.false.invoked"));
+        Ok(Value::Bool(false))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::configure::context::Context;
+    use crate::parser::Statement;
+
+    #[test]
+    fn false_function() {
+        let mut parser = Statement::new().unwrap();
+        let result = parser.parse_and_execute("[false()]", &Context::new()).unwrap();
+        assert_eq!(result, false);
+    }
+}

dsc_lib/src/functions/mod.rs

@@ -12,26 +12,32 @@ use serde_json::Value;
 use std::fmt::Display;
 
 pub mod add;
+pub mod and;
 pub mod base64;
+pub mod bool;
 pub mod concat;
 pub mod create_array;
 pub mod div;
 pub mod envvar;
 pub mod equals;
 pub mod r#if;
+pub mod r#false;
 pub mod format;
 pub mod int;
 pub mod max;
 pub mod min;
 pub mod mod_function;
 pub mod mul;
+pub mod not;
+pub mod or;
 pub mod parameters;
 pub mod path;
 pub mod reference;
 pub mod resource_id;
 pub mod secret;
 pub mod sub;
 pub mod system_root;
+pub mod r#true;
 pub mod variables;
 
 /// The kind of argument that a function accepts.
@@ -77,26 +83,32 @@ impl FunctionDispatcher {
     pub fn new() -> Self {
         let mut functions: HashMap<String, Box<dyn Function>> = HashMap::new();
         functions.insert("add".to_string(), Box::new(add::Add{}));
+        functions.insert("and".to_string(), Box::new(and::And{}));
         functions.insert("base64".to_string(), Box::new(base64::Base64{}));
+        functions.insert("bool".to_string(), Box::new(bool::Bool{}));
         functions.insert("concat".to_string(), Box::new(concat::Concat{}));
         functions.insert("createArray".to_string(), Box::new(create_array::CreateArray{}));
         functions.insert("div".to_string(), Box::new(div::Div{}));
         functions.insert("envvar".to_string(), Box::new(envvar::Envvar{}));
         functions.insert("equals".to_string(), Box::new(equals::Equals{}));
+        functions.insert("false".to_string(), Box::new(r#false::False{}));
         functions.insert("if".to_string(), Box::new(r#if::If{}));
         functions.insert("format".to_string(), Box::new(format::Format{}));
         functions.insert("int".to_string(), Box::new(int::Int{}));
         functions.insert("max".to_string(), Box::new(max::Max{}));
         functions.insert("min".to_string(), Box::new(min::Min{}));
         functions.insert("mod".to_string(), Box::new(mod_function::Mod{}));
         functions.insert("mul".to_string(), Box::new(mul::Mul{}));
+        functions.insert("not".to_string(), Box::new(not::Not{}));
+        functions.insert("or".to_string(), Box::new(or::Or{}));
         functions.insert("parameters".to_string(), Box::new(parameters::Parameters{}));
         functions.insert("path".to_string(), Box::new(path::Path{}));
         functions.insert("reference".to_string(), Box::new(reference::Reference{}));
         functions.insert("resourceId".to_string(), Box::new(resource_id::ResourceId{}));
         functions.insert("secret".to_string(), Box::new(secret::Secret{}));
         functions.insert("sub".to_string(), Box::new(sub::Sub{}));
         functions.insert("systemRoot".to_string(), Box::new(system_root::SystemRoot{}));
+        functions.insert("true".to_string(), Box::new(r#true::True{}));
         functions.insert("variables".to_string(), Box::new(variables::Variables{}));
         Self {
             functions,