/// <summary>
/// Creates a new FunctionContext instance.
/// </summary>
/// <param name="engine"> The script engine. </param>
/// <param name="scope"> The function scope. </param>
/// <param name="functionName"> The name of the function. </param>
/// <param name="argumentNames"> The names of the arguments. </param>
/// <param name="body"> The source code for the body of the function. </param>
/// <param name="options"> Options that influence the compiler. </param>
public FunctionMethodGenerator(ScriptEngine engine, DeclarativeScope scope, string functionName, IList<string> argumentNames, string body, CompilerOptions options)
: base(engine, scope, new StringScriptSource(body), options)
{
this.Name = functionName;
this.ArgumentNames = argumentNames;
this.BodyText = body;
}
/// <summary>
/// Creates a new FunctionMethodGenerator instance.
/// </summary>
/// <param name="engine"> The script engine. </param>
/// <param name="scope"> The function scope. </param>
/// <param name="name"> The name of the function. </param>
/// <param name="argumentNames"> The names of the arguments. </param>
/// <param name="bodyText"> The source code of the function. </param>
/// <param name="body"> The root of the abstract syntax tree for the body of the function. </param>
/// <param name="scriptPath"> The URL or file system path that the script was sourced from. </param>
/// <param name="options"> Options that influence the compiler. </param>
public FunctionMethodGenerator(ScriptEngine engine, DeclarativeScope scope, string functionName, IList<string> argumentNames, string bodyText, Statement body, string scriptPath, CompilerOptions options)
: base(engine, scope, new DummyScriptSource(scriptPath), options)
{
this.Name = functionName;
this.ArgumentNames = argumentNames;
this.BodyRoot = body;
this.BodyText = bodyText;
Validate();
}
/// <summary>
/// Creates a new MethodGenerator instance.
/// </summary>
/// <param name="engine"> The script engine. </param>
/// <param name="scope"> The initial scope. </param>
/// <param name="source"> The source of javascript code. </param>
/// <param name="options"> Options that influence the compiler. </param>
protected MethodGenerator(ScriptEngine engine, Scope scope, ScriptSource source, CompilerOptions options)
{
if (engine == null)
throw new ArgumentNullException("engine");
if (scope == null)
throw new ArgumentNullException("scope");
if (source == null)
throw new ArgumentNullException("source");
if (options == null)
throw new ArgumentNullException("options");
this.Engine = engine;
this.InitialScope = scope;
this.Source = source;
this.Options = options;
this.StrictMode = this.Options.ForceStrictMode;
}
// INITIALIZATION
//_________________________________________________________________________________________
/// <summary>
/// Creates a Parser instance with the given lexer supplying the tokens.
/// </summary>
/// <param name="engine"> The associated script engine. </param>
/// <param name="lexer"> The lexical analyser that provides the tokens. </param>
/// <param name="initialScope"> The initial variable scope. </param>
/// <param name="options"> Options that influence the compiler. </param>
/// <param name="context"> The context of the code (global, function or eval). </param>
public Parser(ScriptEngine engine, Lexer lexer, Scope initialScope, CompilerOptions options, CodeContext context)
{
if (engine == null)
throw new ArgumentNullException("engine");
if (lexer == null)
throw new ArgumentNullException("lexer");
if (initialScope == null)
throw new ArgumentNullException("initialScope");
this.engine = engine;
this.lexer = lexer;
this.lexer.ParserExpressionState = ParserExpressionState.Literal;
this.currentScope = this.initialScope = initialScope;
this.methodOptimizationHints = new MethodOptimizationHints();
this.options = options;
this.context = context;
this.StrictMode = options.ForceStrictMode;
this.Consume();
}
// EVAL SUPPORT
//_________________________________________________________________________________________
//private class EvalCacheKey
//{
// public string Code;
// public Compiler.Scope Scope;
// public bool StrictMode;
// public override int GetHashCode()
// {
// int bitValue = 1;
// int hashCode = this.Code.GetHashCode();
// var scope = this.Scope;
// do
// {
// if (scope is Compiler.DeclarativeScope)
// hashCode ^= bitValue;
// scope = scope.ParentScope;
// bitValue *= 2;
// } while (scope != null);
// if (this.StrictMode == true)
// hashCode ^= bitValue;
// return hashCode;
// }
// public override bool Equals(object obj)
// {
// if ((obj is EvalCacheKey) == false)
// return false;
// var other = (EvalCacheKey) obj;
// if (this.Code != other.Code ||
// this.StrictMode != other.StrictMode)
// return false;
// var scope1 = this.Scope;
// var scope2 = other.Scope;
// do
// {
// if (scope1.GetType() != scope2.GetType())
// return false;
// scope1 = scope1.ParentScope;
// scope2 = scope2.ParentScope;
// if (scope1 == null && scope2 != null)
// return false;
// if (scope1 != null && scope2 == null)
// return false;
// } while (scope1 != null);
// return true;
// }
//}
//private Dictionary<EvalCacheKey, WeakReference> evalCache =
// new Dictionary<EvalCacheKey, WeakReference>();
/// <summary>
/// Evaluates the given javascript source code and returns the result.
/// </summary>
/// <param name="code"> The source code to evaluate. </param>
/// <param name="scope"> The containing scope. </param>
/// <param name="thisObject"> The value of the "this" keyword in the containing scope. </param>
/// <param name="strictMode"> Indicates whether the eval statement is being called from
/// strict mode code. </param>
/// <returns> The value of the last statement that was executed, or <c>undefined</c> if
/// there were no executed statements. </returns>
internal object Eval(string code, Compiler.Scope scope, object thisObject, bool strictMode)
{
// Check if the cache contains the eval already.
//var key = new EvalCacheKey() { Code = code, Scope = scope, StrictMode = strictMode };
//WeakReference cachedEvalGenRef;
//if (evalCache.TryGetValue(key, out cachedEvalGenRef) == true)
//{
// var cachedEvalGen = (Compiler.EvalMethodGenerator)cachedEvalGenRef.Target;
// if (cachedEvalGen != null)
// {
// // Replace the "this object" before running.
// cachedEvalGen.ThisObject = thisObject;
// // Execute the cached code.
// return ((Compiler.EvalMethodGenerator)cachedEvalGen).Execute();
// }
//}
// Parse the eval string into an AST.
var options = new Compiler.CompilerOptions()
{
ForceStrictMode = strictMode
};
var evalGen = new Jurassic.Compiler.EvalMethodGenerator(
this, // The script engine.
scope, // The scope to run the code in.
new StringScriptSource(code), // The source code to execute.
options, // Options.
thisObject); // The value of the "this" keyword.
// Make sure the eval cache doesn't get too big. TODO: add some sort of LRU strategy?
//if (evalCache.Count > 100)
// evalCache.Clear();
//// Add the eval method generator to the cache.
//evalCache[key] = new WeakReference(evalGen);
// Compile and run the eval code.
return(evalGen.Execute());
}
/// <summary>
/// Creates a new EvalMethodGenerator instance.
/// </summary>
/// <param name="engine"> The script engine. </param>
/// <param name="parentScope"> The scope of the calling code. </param>
/// <param name="source"> The script code to execute. </param>
/// <param name="options"> Options that influence the compiler. </param>
/// <param name="thisObject"> The value of the "this" keyword in the calling code. </param>
public EvalMethodGenerator(ScriptEngine engine, Scope parentScope, ScriptSource source, CompilerOptions options, object thisObject)
: base(engine, parentScope, source, options)
{
this.ThisObject = thisObject;
}
/// <summary>
/// Creates a new GlobalMethodGenerator instance.
/// </summary>
/// <param name="engine"> The script engine. </param>
/// <param name="source"> The source of javascript code. </param>
/// <param name="options"> Options that influence the compiler. </param>
public GlobalMethodGenerator(ScriptEngine engine, ScriptSource source, CompilerOptions options)
: base(engine, engine.CreateGlobalScope(), source, options)
{
}
/// <summary>
/// Creates a new EvalMethodGenerator instance.
/// </summary>
/// <param name="engine"> The script engine. </param>
/// <param name="parentScope"> The scope of the calling code. </param>
/// <param name="source"> The script code to execute. </param>
/// <param name="options"> Options that influence the compiler. </param>
/// <param name="thisObject"> The value of the "this" keyword in the calling code. </param>
public EvalMethodGenerator(ScriptEngine engine, Scope parentScope, ScriptSource source, CompilerOptions options, object thisObject)
: base(engine, parentScope, source, options)
{
this.ThisObject = thisObject;
}
/// <summary>
/// Creates a new MethodGenerator instance.
/// </summary>
/// <param name="engine"> The script engine. </param>
/// <param name="scope"> The initial scope. </param>
/// <param name="source"> The source of javascript code. </param>
/// <param name="options"> Options that influence the compiler. </param>
protected MethodGenerator(ScriptEngine engine, Scope scope, ScriptSource source, CompilerOptions options)
{
if (engine == null)
{
throw new ArgumentNullException("engine");
}
if (scope == null)
{
throw new ArgumentNullException("scope");
}
if (source == null)
{
throw new ArgumentNullException("source");
}
if (options == null)
{
throw new ArgumentNullException("options");
}
this.Engine = engine;
this.InitialScope = scope;
this.Source = source;
this.Options = options;
this.StrictMode = this.Options.ForceStrictMode;
}
/// <summary>
/// Creates a new GlobalMethodGenerator instance.
/// </summary>
/// <param name="engine"> The script engine. </param>
/// <param name="source"> The source of javascript code. </param>
/// <param name="options"> Options that influence the compiler. </param>
public GlobalMethodGenerator(ScriptEngine engine, ScriptSource source, CompilerOptions options)
: base(engine, engine.CreateGlobalScope(), source, options)
{
}
