public JsValue EvaluateBinaryExpression(BinaryExpression expression)
{
var leftExpression = EvaluateExpression(expression.Left);
JsValue left = _engine.GetValue(leftExpression);
var rightExpression = EvaluateExpression(expression.Right);
JsValue right = _engine.GetValue(rightExpression);
JsValue value;
switch (expression.Operator)
{
case BinaryOperator.Plus:
var lprim = TypeConverter.ToPrimitive(left);
var rprim = TypeConverter.ToPrimitive(right);
if (lprim.IsString() || rprim.IsString())
{
value = TypeConverter.ToString(lprim) + TypeConverter.ToString(rprim);
}
else
{
value = TypeConverter.ToNumber(lprim) + TypeConverter.ToNumber(rprim);
}
break;
case BinaryOperator.Minus:
value = TypeConverter.ToNumber(left) - TypeConverter.ToNumber(right);
break;
case BinaryOperator.Times:
if (left == Undefined.Instance || right == Undefined.Instance)
{
value = Undefined.Instance;
}
else
{
value = TypeConverter.ToNumber(left) * TypeConverter.ToNumber(right);
}
break;
case BinaryOperator.Divide:
value = Divide(left, right);
break;
case BinaryOperator.Modulo:
if (left == Undefined.Instance || right == Undefined.Instance)
{
value = Undefined.Instance;
}
else
{
value = TypeConverter.ToNumber(left) % TypeConverter.ToNumber(right);
}
break;
case BinaryOperator.Equal:
value = Equal(left, right);
break;
case BinaryOperator.NotEqual:
value = !Equal(left, right);
break;
case BinaryOperator.Greater:
value = Compare(right, left, false);
if (value == Undefined.Instance)
{
value = false;
}
break;
case BinaryOperator.GreaterOrEqual:
value = Compare(left, right);
if (value == Undefined.Instance || value.AsBoolean())
{
value = false;
}
else
{
value = true;
}
break;
case BinaryOperator.Less:
value = Compare(left, right);
if (value == Undefined.Instance)
{
value = false;
}
break;
case BinaryOperator.LessOrEqual:
value = Compare(right, left, false);
if (value == Undefined.Instance || value.AsBoolean())
{
value = false;
}
else
{
value = true;
}
break;
case BinaryOperator.StrictlyEqual:
return(StrictlyEqual(left, right));
case BinaryOperator.StricltyNotEqual:
return(!StrictlyEqual(left, right));
case BinaryOperator.BitwiseAnd:
return(TypeConverter.ToInt32(left) & TypeConverter.ToInt32(right));
case BinaryOperator.BitwiseOr:
return(TypeConverter.ToInt32(left) | TypeConverter.ToInt32(right));
case BinaryOperator.BitwiseXOr:
return(TypeConverter.ToInt32(left) ^ TypeConverter.ToInt32(right));
case BinaryOperator.LeftShift:
return(TypeConverter.ToInt32(left) << (int)(TypeConverter.ToUint32(right) & 0x1F));
case BinaryOperator.RightShift:
return(TypeConverter.ToInt32(left) >> (int)(TypeConverter.ToUint32(right) & 0x1F));
case BinaryOperator.UnsignedRightShift:
return((uint)TypeConverter.ToInt32(left) >> (int)(TypeConverter.ToUint32(right) & 0x1F));
case BinaryOperator.InstanceOf:
var f = right.TryCast <FunctionInstance>();
if (f == null)
{
throw new JavaScriptException(_engine.TypeError, "instanceof can only be used with a function object");
}
value = f.HasInstance(left);
break;
case BinaryOperator.In:
if (!right.IsObject())
{
throw new JavaScriptException(_engine.TypeError, "in can only be used with an object");
}
value = right.AsObject().HasProperty(TypeConverter.ToString(left));
break;
default:
throw new NotImplementedException();
}
return(value);
}
public JsValue EvaluateAssignmentExpression(AssignmentExpression assignmentExpression)
{
var lref = EvaluateExpression(assignmentExpression.Left) as Reference;
JsValue rval = _engine.GetValue(EvaluateExpression(assignmentExpression.Right));
if (lref == null)
{
throw new JavaScriptException(_engine.ReferenceError);
}
if (assignmentExpression.Operator == AssignmentOperator.Assign) // "="
{
if (lref.IsStrict() && lref.GetBase().TryCast <EnvironmentRecord>() != null && (lref.GetReferencedName() == "eval" || lref.GetReferencedName() == "arguments"))
{
throw new JavaScriptException(_engine.SyntaxError);
}
_engine.PutValue(lref, rval);
return(rval);
}
JsValue lval = _engine.GetValue(lref);
switch (assignmentExpression.Operator)
{
case AssignmentOperator.PlusAssign:
var lprim = TypeConverter.ToPrimitive(lval);
var rprim = TypeConverter.ToPrimitive(rval);
if (lprim.IsString() || rprim.IsString())
{
lval = TypeConverter.ToString(lprim) + TypeConverter.ToString(rprim);
}
else
{
lval = TypeConverter.ToNumber(lprim) + TypeConverter.ToNumber(rprim);
}
break;
case AssignmentOperator.MinusAssign:
lval = TypeConverter.ToNumber(lval) - TypeConverter.ToNumber(rval);
break;
case AssignmentOperator.TimesAssign:
if (lval == Undefined.Instance || rval == Undefined.Instance)
{
lval = Undefined.Instance;
}
else
{
lval = TypeConverter.ToNumber(lval) * TypeConverter.ToNumber(rval);
}
break;
case AssignmentOperator.DivideAssign:
lval = Divide(lval, rval);
break;
case AssignmentOperator.ModuloAssign:
if (lval == Undefined.Instance || rval == Undefined.Instance)
{
lval = Undefined.Instance;
}
else
{
lval = TypeConverter.ToNumber(lval) % TypeConverter.ToNumber(rval);
}
break;
case AssignmentOperator.BitwiseAndAssign:
lval = TypeConverter.ToInt32(lval) & TypeConverter.ToInt32(rval);
break;
case AssignmentOperator.BitwiseOrAssign:
lval = TypeConverter.ToInt32(lval) | TypeConverter.ToInt32(rval);
break;
case AssignmentOperator.BitwiseXOrAssign:
lval = TypeConverter.ToInt32(lval) ^ TypeConverter.ToInt32(rval);
break;
case AssignmentOperator.LeftShiftAssign:
lval = TypeConverter.ToInt32(lval) << (int)(TypeConverter.ToUint32(rval) & 0x1F);
break;
case AssignmentOperator.RightShiftAssign:
lval = TypeConverter.ToInt32(lval) >> (int)(TypeConverter.ToUint32(rval) & 0x1F);
break;
case AssignmentOperator.UnsignedRightShiftAssign:
lval = (uint)TypeConverter.ToInt32(lval) >> (int)(TypeConverter.ToUint32(rval) & 0x1F);
break;
default:
throw new NotImplementedException();
}
_engine.PutValue(lref, lval);
return(lval);
}
public JsValue EvaluateUnaryExpression(UnaryExpression unaryExpression)
{
var value = _engine.EvaluateExpression(unaryExpression.Argument);
Reference r;
switch (unaryExpression.Operator)
{
case UnaryOperator.Plus:
return(TypeConverter.ToNumber(_engine.GetValue(value)));
case UnaryOperator.Minus:
var n = TypeConverter.ToNumber(_engine.GetValue(value));
return(double.IsNaN(n) ? double.NaN : n *-1);
case UnaryOperator.BitwiseNot:
return(~TypeConverter.ToInt32(_engine.GetValue(value)));
case UnaryOperator.LogicalNot:
return(!TypeConverter.ToBoolean(_engine.GetValue(value)));
case UnaryOperator.Delete:
r = value as Reference;
if (r == null)
{
return(true);
}
if (r.IsUnresolvableReference())
{
if (r.IsStrict())
{
throw new JavaScriptException(_engine.SyntaxError);
}
return(true);
}
if (r.IsPropertyReference())
{
var o = TypeConverter.ToObject(_engine, r.GetBase());
return(o.Delete(r.GetReferencedName(), r.IsStrict()));
}
if (r.IsStrict())
{
throw new JavaScriptException(_engine.SyntaxError);
}
var bindings = r.GetBase().TryCast <EnvironmentRecord>();
return(bindings.DeleteBinding(r.GetReferencedName()));
case UnaryOperator.Void:
_engine.GetValue(value);
return(Undefined.Instance);
case UnaryOperator.TypeOf:
r = value as Reference;
if (r != null)
{
if (r.IsUnresolvableReference())
{
return("undefined");
}
}
var v = _engine.GetValue(value);
if (v == Undefined.Instance)
{
return("undefined");
}
if (v == Null.Instance)
{
return("object");
}
switch (v.Type)
{
case Types.Boolean: return("boolean");
case Types.Number: return("number");
case Types.String: return("string");
}
if (v.TryCast <ICallable>() != null)
{
return("function");
}
return("object");
default:
throw new ArgumentException();
}
}