protected override PExpr DoVisit()
{
if (IsPendingOrSignal(ref _try, Expr.TryExpr))
{
RuntimeError e = _try.AsErrorResult;
if (e == null || !e.IsCatchable)
{
return(PendingOrSignal(_try));
}
if (!_catching)
{
if (Expr.ExceptionParameter != null)
{
// There can be no error when setting a standard, variable, RefRuntimeObject.
Visitor.ScopeManager.Register(Expr.ExceptionParameter).SetValue(Expr.ExceptionParameter, e.ThrownValue);
}
Visitor.FirstChanceError = null;
_catching = true;
}
if (IsPendingOrSignal(ref _catch, Expr.CatchExpr))
{
return(PendingOrSignal(_catch));
}
}
return(SetResult(RuntimeObj.Undefined));
}
/// <summary>
/// Updates the status based on the current <see cref="PExpr"/>.
/// </summary>
/// <param name="r">The current <see cref="PExpr"/>.</param>
internal protected virtual void UpdateStatus(PExpr r)
{
_error = (_result = r.Result) as RuntimeError;
_status = ScriptEngineStatus.None;
if (r.AsErrorResult != null)
{
_status |= ScriptEngineStatus.IsError;
}
if (r.IsPending)
{
Debug.Assert(r.DeferredStatus != PExpr.DeferredKind.None);
switch (r.DeferredStatus)
{
case PExpr.DeferredKind.Timeout: _status |= ScriptEngineStatus.Timeout; break;
case PExpr.DeferredKind.Breakpoint: _status |= ScriptEngineStatus.Breakpoint; break;
case PExpr.DeferredKind.AsyncCall: _status |= ScriptEngineStatus.AsyncCall; break;
case PExpr.DeferredKind.FirstChanceError: _status |= ScriptEngineStatus.FirstChanceError; break;
default: Debug.Fail("UpdateStatus"); break;
}
}
else
{
_status |= ScriptEngineStatus.IsFinished;
}
}
internal PExpr StepOver(Frame f, StepOverKind kind)
{
if (!f.IsResolved)
{
RuntimeError fError = null;
if (kind != StepOverKind.InternalStepOver)
{
fError = _firstChanceError;
_breakOnNext = kind == StepOverKind.ExternalStepIn;
if (_hasTimeout)
{
_timeLimit = DateTime.UtcNow + _timeout;
}
}
do
{
Debug.Assert(Frames.Contains(f));
if (fError != null)
{
PExpr r = _currentFrame.SetResult(fError);
_currentFrame.DoDispose();
fError = null;
}
else
{
PExpr r = _currentFrame.VisitAndClean();
if (r.IsPending)
{
return(r);
}
}
}while(!f.IsResolved);
}
return(new PExpr(f.Result));
}
protected override PExpr DoVisit()
{
if (IsPendingOrSignal(ref _try, Expr.TryExpr))
{
RuntimeError e = _try.AsErrorResult;
if (e == null || !e.IsCatchable)
{
return(PendingOrSignal(_try));
}
if (!_catching)
{
if (Expr.ExceptionParameter != null)
{
_visitor.ScopeManager.Register(Expr.ExceptionParameter).Value = e.ThrownValue;
}
_visitor.FirstChanceError = null;
_catching = true;
}
if (IsPendingOrSignal(ref _catch, Expr.CatchExpr))
{
return(PendingOrSignal(_catch));
}
}
return(SetResult(RuntimeObj.Undefined));
}
/// <summary>
/// Resets the current execution. This frees the <see cref="ScriptEngine"/>: new calls to its <see cref="G:ScriptEngine.Execute"/> can be made.
/// </summary>
public void Dispose()
{
if (_visitor != null)
{
_engine.StopExecution();
_error = null;
_result = null;
_status = ScriptEngineStatus.None;
_visitor = null;
}
}
public virtual PExpr SetResult(RuntimeObj result)
{
Debug.Assert(_result == null);
RuntimeError e = result as RuntimeError;
if (e != null && !(e.Expr is SyntaxErrorExpr) && Visitor.EnableFirstChanceError)
{
Visitor.FirstChanceError = e;
return(new PExpr(this, PExprKind.FirstChanceError));
}
return(new PExpr((_result = result)));
}
/// <summary>
/// Updates the status based on the current <see cref="PExpr"/>.
/// </summary>
/// <param name="r">The current <see cref="PExpr"/>.</param>
protected internal virtual void UpdateStatus( PExpr r )
{
_error = (_result = r.Result) as RuntimeError;
_status = ScriptEngineStatus.None;
if( r.AsErrorResult != null ) _status |= ScriptEngineStatus.IsError;
if( r.IsPending )
{
Debug.Assert( r.DeferredStatus != PExpr.DeferredKind.None );
switch( r.DeferredStatus )
{
case PExpr.DeferredKind.Timeout: _status |= ScriptEngineStatus.Timeout; break;
case PExpr.DeferredKind.Breakpoint: _status |= ScriptEngineStatus.Breakpoint; break;
case PExpr.DeferredKind.AsyncCall: _status |= ScriptEngineStatus.AsyncCall; break;
case PExpr.DeferredKind.FirstChanceError: _status |= ScriptEngineStatus.FirstChanceError; break;
default: Debug.Fail( "UpdateStatus" ); break;
}
}
else _status |= ScriptEngineStatus.IsFinished;
}
/// <summary>
/// Resets the current execution. This frees the <see cref="ScriptEngine"/>: new calls to its <see cref="G:ScriptEngine.Execute"/> can be made.
/// </summary>
public void Dispose()
{
if( _visitor != null )
{
_engine.StopExecution();
_error = null;
_result = null;
_status = ScriptEngineStatus.None;
_visitor = null;
}
}
public void ResetCurrentEvaluation()
{
_firstFrame = _currentFrame = null;
_firstChanceError = null;
}
protected override PExpr DoVisit()
{
if (IsPendingOrSignal(ref _expression, Expr.Expression))
{
RuntimeError e = _expression.AsErrorResult;
if (e != null &&
e.IsReferenceError &&
((int)Expr.TokenType & 15) == ((int)TokenizerToken.TypeOf & 15))
{
return(SetResult(StringObj.Create(RuntimeObj.TypeUndefined)));
}
return(PendingOrSignal(_expression));
}
RuntimeObj result = _expression.Result;
// Minus and Plus are classified as a binary operator.
// Handle those special cases here.
if (Expr.TokenType == TokenizerToken.Minus)
{
result = DoubleObj.Create(-result.ToDouble());
}
else if (Expr.TokenType == TokenizerToken.Plus)
{
result = DoubleObj.Create(result.ToDouble());
}
else
{
switch ((int)Expr.TokenType & 15)
{
case (int)TokenizerToken.Not & 15:
{
result = result.ToBoolean() ? BooleanObj.False : BooleanObj.True;
break;
}
case (int)TokenizerToken.BitwiseNot & 15:
{
result = DoubleObj.Create(~JSSupport.ToInt64(result.ToDouble()));
break;
}
case (int)TokenizerToken.TypeOf & 15:
{
// Well known Javascript bug: typeof null === "object".
if (result == RuntimeObj.Null)
{
result = StringObj.Create(RuntimeObj.TypeObject);
}
else
{
result = StringObj.Create(result.Type);
}
break;
}
case (int)TokenizerToken.IndexOf & 15:
{
RefRuntimeIndexedObj iO = result as RefRuntimeIndexedObj;
if (iO == null)
{
result = new RuntimeError(Expr, "No associated index. indexof must be used on a foreach variable.");
}
else
{
result = iO.Index;
}
break;
}
case (int)TokenizerToken.Void & 15:
{
result = RuntimeObj.Undefined;
break;
}
default: throw UnsupportedOperatorException();
}
}
return(SetResult(result));
}
