RuntimeObj BitwiseShift(RuntimeObj val, RuntimeObj shift, bool right)
{
if (val == JSEvalNumber.Zero)
{
return(val);
}
double dR = shift.ToDouble();
int iShift;
if (Double.IsNaN(dR) || (iShift = (dR < 0 ? (int)Math.Ceiling(dR) : (int)Math.Floor(dR)) % 64) == 0)
{
return(Global.CreateNumber(val));
}
if (right && iShift < 0)
{
return(JSEvalNumber.Zero);
}
Int32 lN = JSSupport.ToInt32(val.ToDouble());
if (lN == 0)
{
return(JSEvalNumber.Zero);
}
return(Global.CreateNumber(right ? lN >> iShift : lN << iShift));
}
RuntimeObj BitwiseShiftRightUnsigned(RuntimeObj left, RuntimeObj right)
{
if (left == JSEvalNumber.Zero)
{
return(left);
}
double dR = right.ToDouble();
if (Double.IsNaN(dR))
{
return(Global.CreateNumber(left));
}
int iShift = (dR < 0 ? (int)Math.Ceiling(dR) : (int)Math.Floor(dR)) % 64;
if (iShift < 0)
{
return(JSEvalNumber.Zero);
}
UInt32 lN = (UInt32)JSSupport.ToInt64(left.ToDouble());
if (lN == 0)
{
return(JSEvalNumber.Zero);
}
return(Global.CreateNumber(lN >> iShift));
}
RuntimeObj BitwiseShiftRightUnsigned(RuntimeObj left, RuntimeObj right)
{
if (left == DoubleObj.Zero)
{
return(left);
}
double dR = right.ToDouble();
if (double.IsNaN(dR))
{
return(left is DoubleObj ? left : DoubleObj.Create(left.ToDouble()));
}
int iShift = (dR < 0 ? (int)Math.Ceiling(dR) : (int)Math.Floor(dR)) % 64;
if (iShift < 0)
{
return(DoubleObj.Zero);
}
uint lN = (uint)JSSupport.ToInt64(left.ToDouble());
if (lN == 0)
{
return(DoubleObj.Zero);
}
return(DoubleObj.Create(lN >> iShift));
}
RuntimeObj BitwiseShift(RuntimeObj val, RuntimeObj shift, bool right)
{
if (val == DoubleObj.Zero)
{
return(val);
}
double dR = shift.ToDouble();
int iShift;
if (double.IsNaN(dR) || (iShift = (dR < 0 ? (int)Math.Ceiling(dR) : (int)Math.Floor(dR)) % 64) == 0)
{
return(val.ToValue() as DoubleObj ?? DoubleObj.Create(val.ToDouble()));
}
if (right && iShift < 0)
{
return(DoubleObj.Zero);
}
int lN = JSSupport.ToInt32(val.ToDouble());
if (lN == 0)
{
return(DoubleObj.Zero);
}
return(DoubleObj.Create(right ? lN >> iShift : lN << iShift));
}
protected override PExpr DoVisit()
{
if (IsPendingOrSignal(ref _expression, Expr.Expression))
{
return(PendingOrSignal(_expression));
}
RuntimeObj result = _expression.Result;
// Minus and Plus are classified as a binary operator.
// Handle those special cases here.
if (Expr.TokenType == JSTokenizerToken.Minus)
{
result = Global.CreateNumber(-result.ToDouble());
}
else if (Expr.TokenType == JSTokenizerToken.Plus)
{
result = Global.CreateNumber(result.ToDouble());
}
else
{
switch ((int)Expr.TokenType & 15)
{
case (int)JSTokenizerToken.Not & 15:
{
result = Global.CreateBoolean(!result.ToBoolean());
break;
}
case (int)JSTokenizerToken.BitwiseNot & 15:
{
result = Global.CreateNumber(~JSSupport.ToInt64(result.ToDouble()));
break;
}
case (int)JSTokenizerToken.TypeOf & 15:
{
// Well known Javascript bug: typeof null === "object".
if (result == RuntimeObj.Null)
{
result = Global.CreateString(RuntimeObj.TypeObject);
}
else
{
result = Global.CreateString(result.Type);
}
break;
}
case (int)JSTokenizerToken.Void & 15:
{
result = RuntimeObj.Undefined;
break;
}
default: throw UnsupportedOperatorException();
}
}
return(SetResult(result));
}
public override PExpr Visit(IAccessorFrame frame)
{
var s = frame.GetState(c =>
c.On("toString").OnCall((f, args) =>
{
return(f.SetResult(f.Global.CreateString(JSSupport.ToString(_value))));
}
));
return(s != null?s.Visit() : frame.SetError());
}
public override PExpr Visit(IAccessorFrame frame)
{
var s = frame.GetState(c =>
c.On("toString").OnCall((f, args) =>
{
int radix = 10;
if (args.Count == 1)
{
radix = JSSupport.ToInt32(args[0].ToDouble());
}
if (radix < 2 || radix > 36)
{
return(f.SetError("Radix must be between 2 and 36."));
}
return(f.SetResult(f.Global.CreateString(JSSupport.ToString(_value, radix))));
}
));
return(s != null?s.Visit() : frame.SetError());
}
public override PExpr Visit(IAccessorFrame frame)
{
var s = frame.GetState(c =>
c.On("charAt").OnCall((f, args) =>
{
int idx = args.Count > 0 ? JSSupport.ToInt32(args[0].ToDouble()) : 0;
if (idx < 0 || idx >= _value.Length)
{
return(f.SetResult(JSEvalString.EmptyString));
}
return(f.SetResult(f.Global.CreateString(new String(_value[idx], 1))));
})
.On("toString").OnCall((f, args) =>
{
return(f.SetResult(this));
}
));
return(s != null?s.Visit() : frame.SetError());
}
public override PExpr Visit(IAccessorFrame frame)
{
var s = frame.GetImplementationState(c =>
c.OnIndex((f, arg) =>
{
int idx = JSSupport.ToInt32(arg.ToDouble());
if (idx < 0 || idx >= _value.Length)
{
return(f.SetResult(EmptyString));
}
return(f.SetResult(Create(new string( _value[idx], 1 ))));
})
.On("ToString").OnCall((f, args) =>
{
return(f.SetResult(this));
}
));
return(s != null?s.Visit() : frame.SetError());
}
protected override PExpr DoVisit()
{
if (IsPendingOrSignal(ref _left, Expr.Left))
{
return(PendingOrSignal(_left));
}
// Do not evaluate right expression if it is useless: short-circuit boolean evaluation.
if ((Expr.BinaryOperatorToken == JSTokenizerToken.And && !_left.Result.ToBoolean()) ||
(Expr.BinaryOperatorToken == JSTokenizerToken.Or && _left.Result.ToBoolean()))
{
return(SetResult(_left.Result));
}
if (IsPendingOrSignal(ref _right, Expr.Right))
{
return(PendingOrSignal(_right));
}
RuntimeObj left = _left.Result;
RuntimeObj right = _right.Result;
// Right value is the result for And and Or.
RuntimeObj result = right;
if (Expr.BinaryOperatorToken != JSTokenizerToken.And && Expr.BinaryOperatorToken != JSTokenizerToken.Or)
{
if ((Expr.BinaryOperatorToken & JSTokenizerToken.IsCompareOperator) != 0)
{
#region ==, <, >, <=, >=, !=, === and !==
int compareValue;
switch ((int)Expr.BinaryOperatorToken & 15)
{
case (int)JSTokenizerToken.StrictEqual & 15:
{
result = Global.CreateBoolean(new RuntimeObjComparer(left, right).AreEqualStrict(Global));
break;
}
case (int)JSTokenizerToken.StrictDifferent & 15:
{
result = Global.CreateBoolean(!new RuntimeObjComparer(left, right).AreEqualStrict(Global));
break;
}
case (int)JSTokenizerToken.Greater & 15:
{
result = Global.CreateBoolean(new RuntimeObjComparer(left, right).Compare(Global, out compareValue) && compareValue > 0);
break;
}
case (int)JSTokenizerToken.GreaterOrEqual & 15:
{
result = Global.CreateBoolean(new RuntimeObjComparer(left, right).Compare(Global, out compareValue) && compareValue >= 0);
break;
}
case (int)JSTokenizerToken.Less & 15:
{
result = Global.CreateBoolean(new RuntimeObjComparer(left, right).Compare(Global, out compareValue) && compareValue < 0);
break;
}
case (int)JSTokenizerToken.LessOrEqual & 15:
{
result = Global.CreateBoolean(new RuntimeObjComparer(left, right).Compare(Global, out compareValue) && compareValue <= 0);
break;
}
case (int)JSTokenizerToken.Equal & 15:
{
result = Global.CreateBoolean(new RuntimeObjComparer(left, right).AreEqual(Global));
break;
}
case (int)JSTokenizerToken.Different & 15:
{
result = Global.CreateBoolean(!new RuntimeObjComparer(left, right).AreEqual(Global));
break;
}
default: throw UnsupportedOperatorException();
}
#endregion
}
else if ((Expr.BinaryOperatorToken & JSTokenizerToken.IsBinaryOperator) != 0)
{
#region |, ^, &, >>, <<, >>>, +, -, /, * and %.
switch ((int)Expr.BinaryOperatorToken & 15)
{
case (int)JSTokenizerToken.Plus & 15:
{
if (ReferenceEquals(left.Type, RuntimeObj.TypeNumber) && ReferenceEquals(right.Type, RuntimeObj.TypeNumber))
{
result = Global.CreateNumber(left.ToDouble() + right.ToDouble());
}
else
{
result = Global.CreateString(String.Concat(left.ToString(), right.ToString()));
}
break;
}
case (int)JSTokenizerToken.Minus & 15:
{
result = Global.CreateNumber(left.ToDouble() - right.ToDouble());
break;
}
case (int)JSTokenizerToken.Mult & 15:
{
result = Global.CreateNumber(left.ToDouble() * right.ToDouble());
break;
}
case (int)JSTokenizerToken.Divide & 15:
{
result = Global.CreateNumber(left.ToDouble() / right.ToDouble());
break;
}
case (int)JSTokenizerToken.Modulo & 15:
{
if (right == JSEvalNumber.Zero || left == JSEvalNumber.NegativeInfinity || left == JSEvalNumber.Infinity)
{
result = JSEvalNumber.NaN;
}
else if (left == JSEvalNumber.NegativeInfinity || left == JSEvalNumber.Infinity)
{
result = right;
}
else
{
result = Global.CreateNumber(left.ToDouble() % right.ToDouble());
}
break;
}
case (int)JSTokenizerToken.BitwiseAnd & 15:
{
Int64 l = JSSupport.ToInt64(left.ToDouble());
Int64 rO = JSSupport.ToInt64(right.ToDouble());
result = Global.CreateNumber(l & rO);
break;
}
case (int)JSTokenizerToken.BitwiseOr & 15:
{
Int64 l = JSSupport.ToInt64(left.ToDouble());
Int64 rO = JSSupport.ToInt64(right.ToDouble());
result = Global.CreateNumber(l | rO);
break;
}
case (int)JSTokenizerToken.BitwiseXOr & 15:
{
Int64 l = JSSupport.ToInt64(left.ToDouble());
Int64 rO = JSSupport.ToInt64(right.ToDouble());
result = Global.CreateNumber(l ^ rO);
break;
}
case (int)JSTokenizerToken.BitwiseShiftLeft & 15:
{
result = BitwiseShift(left, right, false);
break;
}
case (int)JSTokenizerToken.BitwiseShiftRight & 15:
{
result = BitwiseShift(left, right, true);
break;
}
case (int)JSTokenizerToken.BitwiseShiftRightNoSignBit & 15:
{
result = BitwiseShiftRightUnsigned(left, right);
break;
}
default: throw UnsupportedOperatorException();
}
#endregion
}
else
{
throw UnsupportedOperatorException();
}
}
return(SetResult(result));
}
public override string ToString()
{
return(JSSupport.ToString(_value));
}
public override double ToDouble()
{
return(JSSupport.ToNumber(_value));
}
public override bool ToBoolean()
{
return(JSSupport.ToBoolean(_value));
}
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));
}
