Merge pull request #241 from PowerShell/FixAutomaticVariable

Fix matches and psversiontable not recognized by variableanalysis

Author: Quoc Truong

Engine/SpecialVars.cs

@@ -34,6 +34,8 @@ internal class SpecialVars
         internal const string PSScriptRoot = "PSScriptRoot";
         internal const string PSCommandPath = "PSCommandPath";
         internal const string ExecutionContext = "ExecutionContext";
+        internal const string Matches = "Matches";
+        internal const string PSVersionTable = "PSVersionTable";
 
         internal static readonly string[] InitializedVariables;
 
@@ -63,7 +65,9 @@ static SpecialVars()
                                                                    MyInvocation,  
                                                                    PSScriptRoot,  
                                                                    PSCommandPath,
-                                                                   ExecutionContext
+                                                                   ExecutionContext,
+                                                                   Matches,
+                                                                   PSVersionTable
                                                                };
         internal static readonly Type[] AutomaticVariableTypes = new Type[]  
                                                                  {  
@@ -76,7 +80,9 @@ static SpecialVars()
                                                                    /* MyInvocation */      typeof(InvocationInfo),  
                                                                    /* PSScriptRoot */      typeof(string),  
                                                                    /* PSCommandPath */     typeof(string),  
-                                                                   /* ExecutionContext */  typeof(EngineIntrinsics), 
+                                                                   /* ExecutionContext */  typeof(EngineIntrinsics),
+                                                                   /* Matches */           typeof(System.Collections.Hashtable),
+                                                                   /* PSVersionTable */    typeof(System.Collections.Hashtable)
                                                                  };
 
 

Tests/Rules/AvoidGlobalOrUnitializedVarsNoViolations.ps1

@@ -9,6 +9,11 @@ function Test {
 
 $a = 3;
 
+"hi there!" -match "hi" | Out-Null;
+$matches[0];
+
+$PSVersionTable;
+
 if ($true) {
     $a = 4;
     $c = 3;