コード例 #1
0
ファイル: ExpressionIntepreter.cs プロジェクト: skipme/jint
        public JsValue EvaluateBinaryExpression(BinaryExpression expression)
        {
            JsValue left = _engine.GetValue(EvaluateExpression(expression.Left));
            JsValue right = _engine.GetValue(EvaluateExpression(expression.Right));
            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;
        }
コード例 #2
0
 public ExpressionContext(JScriptBuilder builder, BinaryExpression e)
     : this(builder)
 {
     _op = OperatorInfo.GetBinary(e.Operator);
     Enter();
 }
コード例 #3
0
 private void EmitBinaryExpression(BinaryExpression e)
 {
     using (var ec = new ExpressionContext(this, e))
     {
         Emit(e.Left);
         Write(" " + ec.Token + " ");
         Emit(e.Right);
     }
 }