In configuration settings of the Jint JS engine was added one new property - CompileRegex (default false)

Author: Taritsyn

src/JavaScriptEngineSwitcher.Jint/JavaScriptEngineSwitcher.Jint.csproj

@@ -22,7 +22,8 @@
     <PackageIconFullPath>../../Icons/JavaScriptEngineSwitcher_Jint_Logo128x128.png</PackageIconFullPath>
     <Description>JavaScriptEngineSwitcher.Jint contains a `JintJsEngine` adapter (wrapper for the Jint).</Description>
     <PackageTags>$(PackageCommonTags);Jint</PackageTags>
-    <PackageReleaseNotes>Jint was updated to version 4.8.0.</PackageReleaseNotes>
+    <PackageReleaseNotes>1. Jint was updated to version 4.8.0;
+2. In configuration settings of the Jint JS engine was added one new property - `CompileRegex` (default `false`).</PackageReleaseNotes>
   </PropertyGroup>
 
   <ItemGroup>

src/JavaScriptEngineSwitcher.Jint/JintJsEngine.cs

@@ -19,6 +19,8 @@
 using OriginalMemoryLimitExceededException = Jint.Runtime.MemoryLimitExceededException;
 using OriginalObjectInstance = Jint.Native.Object.ObjectInstance;
 using OriginalParsedScript = Jint.Prepared<Acornima.Ast.Script>;
+using OriginalParsingOptions = Jint.ScriptParsingOptions;
+using OriginalPreparationOptions = Jint.ScriptPreparationOptions;
 using OriginalRecursionDepthOverflowException = Jint.Runtime.RecursionDepthOverflowException;
 using OriginalScriptPreparationException = Jint.ScriptPreparationException;
 using OriginalStatementsCountOverflowException = Jint.Runtime.StatementsCountOverflowException;
@@ -63,6 +65,11 @@ public sealed class JintJsEngine : JsEngineBase
 		/// </summary>
 		private OriginalEngine _jsEngine;
 
+		/// <summary>
+		/// Script preparation options
+		/// </summary>
+		private OriginalPreparationOptions _preparationOptions;
+
 		/// <summary>
 		/// Token source for canceling of script execution
 		/// </summary>
@@ -86,7 +93,7 @@ public sealed class JintJsEngine : JsEngineBase
 		/// <summary>
 		/// Flag for whether to allow run the script in strict mode
 		/// </summary>
-		private bool _strictMode;
+		private readonly bool _strictMode;
 
 		/// <summary>
 		/// Synchronizer of script execution
@@ -151,6 +158,14 @@ public JintJsEngine(JintSettings settings)
 					options.SetTypeResolver(jintSettings.AllowReflection ?
 						CustomTypeResolvers.AllowingReflection : CustomTypeResolvers.DisallowingReflection);
 				});
+				_preparationOptions = new OriginalPreparationOptions
+				{
+					ParsingOptions = new OriginalParsingOptions
+					{
+						CompileRegex = settings.CompileRegex,
+						RegexTimeout = settings.RegexTimeoutInterval
+					}
+				};
 				_cancellationConstraint = _jsEngine.Constraints.Find<OriginalCancellationConstraint>();
 				if (_debuggerBreakCallback is not null)
 				{
@@ -378,7 +393,8 @@ protected override IPrecompiledScript InnerPrecompile(string code, string docume
 
 			try
 			{
-				parsedScript = OriginalEngine.PrepareScript(code, uniqueDocumentName, _strictMode);
+				parsedScript = OriginalEngine.PrepareScript(code, uniqueDocumentName, _strictMode,
+					_preparationOptions);
 			}
 			catch (OriginalException e)
 			{
@@ -710,6 +726,7 @@ public override void Dispose()
 					_debuggerStepCallback = null;
 					_debuggerBreakCallback = null;
 					_cancellationConstraint = null;
+					_preparationOptions = null;
 
 					if (_cancellationTokenSource is not null)
 					{

src/JavaScriptEngineSwitcher.Jint/JintSettings.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Text.RegularExpressions;
 
 using OriginalDebuggerEventHandler = Jint.Runtime.Debugger.DebugHandler.DebugEventHandler;
 
@@ -33,6 +34,19 @@ public bool AllowDebuggerStatement
 			set { DebuggerStatementHandlingMode = value ? JsDebuggerStatementHandlingMode.Clr : JsDebuggerStatementHandlingMode.Ignore; }
 		}
 
+		/// <summary>
+		/// Gets or sets a value that determines whether to create compiled instances of regular
+		/// expressions during script pre-compilation:
+		///    <c>true</c> - regular expression are compiled by using the <see cref="RegexOptions.Compiled"/> option;
+		///    <c>false</c> - interpreted .NET regular expression instances are created;
+		///    <c>null</c> - inherits from the base options of original JS engine.
+		/// </summary>
+		public bool? CompileRegex
+		{
+			get;
+			set;
+		}
+
 		/// <summary>
 		/// Gets or sets a debugger break callback
 		/// </summary>
@@ -183,6 +197,7 @@ public TimeSpan TimeoutInterval
 		public JintSettings()
 		{
 			AllowReflection = false;
+			CompileRegex = false;
 			DebuggerBreakCallback = null;
 			DebuggerStatementHandlingMode = JsDebuggerStatementHandlingMode.Ignore;
 			DebuggerStepCallback = null;

src/JavaScriptEngineSwitcher.Jint/readme.txt

@@ -17,7 +17,9 @@
    =============
    RELEASE NOTES
    =============
-   Jint was updated to version 4.8.0.
+   1. Jint was updated to version 4.8.0;
+   2. In configuration settings of the Jint JS engine was added one new property -
+      `CompileRegex` (default `false`).
 
    =============
    DOCUMENTATION