/// <inheritdoc />
public override void VisitUndefinedValue(UndefinedValue value)
{
switch (operation)
{
case Operations.Equal:
case Operations.Identical:
case Operations.LessThan:
case Operations.LessThanOrEqual:
case Operations.And:
result = OutSet.CreateBool(false);
break;
case Operations.NotEqual:
case Operations.NotIdentical:
case Operations.GreaterThan:
case Operations.GreaterThanOrEqual:
case Operations.Or:
case Operations.Xor:
result = OutSet.CreateBool(true);
break;
default:
switch (operation)
{
case Operations.Mul:
case Operations.BitAnd:
SetWarning("Object cannot be converted to integer",
AnalysisWarningCause.OBJECT_CONVERTED_TO_INTEGER);
result = OutSet.CreateInt(0);
break;
case Operations.Add:
case Operations.Sub:
case Operations.BitOr:
case Operations.BitXor:
case Operations.ShiftLeft:
case Operations.ShiftRight:
SetWarning("Object cannot be converted to integer",
AnalysisWarningCause.OBJECT_CONVERTED_TO_INTEGER);
result = OutSet.AnyIntegerValue;
break;
case Operations.Div:
SetWarning("Object cannot be converted to integer",
AnalysisWarningCause.OBJECT_CONVERTED_TO_INTEGER);
result = ArithmeticOperation.DivisionByNull(flow);
break;
case Operations.Mod:
SetWarning("Object cannot be converted to integer by modulo operation",
AnalysisWarningCause.OBJECT_CONVERTED_TO_INTEGER);
result = ModuloOperation.ModuloByNull(flow);
break;
default:
base.VisitUndefinedValue(value);
break;
}
break;
}
}
/// <inheritdoc />
public override void VisitStringValue(StringValue value)
{
switch (operation)
{
case Operations.Identical:
result = OutSet.CreateBool(string.Equals(leftOperand.Value, value.Value,
StringComparison.Ordinal));
break;
case Operations.NotIdentical:
result = OutSet.CreateBool(!string.Equals(leftOperand.Value, value.Value,
StringComparison.Ordinal));
break;
case Operations.Mod:
result = ModuloOperation.Modulo(flow, leftOperand.Value, value.Value);
break;
case Operations.BitAnd:
case Operations.BitOr:
case Operations.BitXor:
// Bit operations are defined for every character, not for the entire string
// TODO: PHP string is stored as array of bytes, but printed in UTF8 encoding
result = OutSet.AnyStringValue;
break;
default:
result = LogicalOperation.Logical(OutSet, operation,
TypeConversion.ToBoolean(leftOperand.Value), TypeConversion.ToBoolean(value.Value));
if (result != null)
{
break;
}
int leftInteger;
double leftFloat;
bool isLeftInteger;
bool isLeftHexadecimal;
var isLeftSuccessful = TypeConversion.TryConvertToNumber(leftOperand.Value, true,
out leftInteger, out leftFloat, out isLeftInteger, out isLeftHexadecimal);
int rightInteger;
double rightFloat;
bool isRightInteger;
bool isRightHexadecimal;
var isRightSuccessful = TypeConversion.TryConvertToNumber(value.Value, true,
out rightInteger, out rightFloat, out isRightInteger, out isRightHexadecimal);
// If both strings are convertible to number, they are conpared as numbers
result = (isLeftSuccessful && isRightSuccessful)
? ((isLeftInteger && isRightInteger)
? Comparison.Compare(OutSet, operation, leftInteger, rightInteger)
: Comparison.Compare(OutSet, operation, leftFloat, rightFloat))
: Comparison.Compare(OutSet, operation, leftOperand.Value, value.Value);
if (result != null)
{
break;
}
result = (isLeftInteger && isRightInteger)
? ArithmeticOperation.Arithmetic(flow, operation, leftInteger, rightInteger)
: ArithmeticOperation.Arithmetic(flow, operation, leftFloat, rightFloat);
if (result != null)
{
break;
}
// If string has hexadecimal format, the first zero is recognized.
if (isLeftHexadecimal)
{
leftInteger = 0;
}
if (isRightHexadecimal)
{
rightInteger = 0;
}
// Only shifting operations can happen
if ((isLeftInteger || (isLeftSuccessful &&
TypeConversion.TryConvertToInteger(leftFloat, out leftInteger))) &&
(isRightInteger || (isRightSuccessful &&
TypeConversion.TryConvertToInteger(rightFloat, out rightInteger))))
{
result = BitwiseOperation.Bitwise(OutSet, operation, leftInteger, rightInteger);
if (result != null)
{
break;
}
}
else
{
// If at least one operand can not be recognized, result can be any integer value.
result = BitwiseOperation.Bitwise(OutSet, operation);
if (result != null)
{
break;
}
}
base.VisitStringValue(value);
break;
}
}
/// <inheritdoc />
public override void VisitBooleanValue(BooleanValue value)
{
switch (operation)
{
case Operations.Identical:
result = OutSet.CreateBool(false);
break;
case Operations.NotIdentical:
result = OutSet.CreateBool(true);
break;
default:
var leftBoolean = TypeConversion.ToBoolean(leftOperand.Value);
result = Comparison.Compare(OutSet, operation, leftBoolean, value.Value);
if (result != null)
{
break;
}
result = LogicalOperation.Logical(OutSet, operation, leftBoolean, value.Value);
if (result != null)
{
break;
}
int integerValue;
double floatValue;
bool isInteger;
bool isHexadecimal;
var isSuccessful = TypeConversion.TryConvertToNumber(leftOperand.Value, true,
out integerValue, out floatValue, out isInteger, out isHexadecimal);
var rightInteger = TypeConversion.ToInteger(value.Value);
result = isInteger
? ArithmeticOperation.Arithmetic(flow, operation, integerValue, rightInteger)
: ArithmeticOperation.Arithmetic(flow, operation, floatValue, rightInteger);
if (result != null)
{
break;
}
// If string has hexadecimal format, the first zero is recognized.
if (isHexadecimal)
{
integerValue = 0;
}
if (isInteger || (isSuccessful &&
TypeConversion.TryConvertToInteger(floatValue, out integerValue)))
{
result = BitwiseOperation.Bitwise(OutSet, operation, integerValue, rightInteger);
if (result != null)
{
break;
}
}
else
{
// If the left operand can not be recognized, result can be any integer value.
result = BitwiseOperation.Bitwise(OutSet, operation);
if (result != null)
{
break;
}
}
base.VisitBooleanValue(value);
break;
}
}
/// <inheritdoc />
public override void VisitStringValue(StringValue value)
{
int integerValue;
double floatValue;
bool isInteger;
switch (operation)
{
case Operations.Plus:
TypeConversion.TryConvertToNumber(value.Value, true, out integerValue,
out floatValue, out isInteger);
if (isInteger)
{
result = OutSet.CreateInt(integerValue);
}
else
{
result = OutSet.CreateDouble(floatValue);
}
break;
case Operations.Minus:
TypeConversion.TryConvertToNumber(value.Value, true, out integerValue,
out floatValue, out isInteger);
if (isInteger)
{
if ((integerValue == 0) || ((-integerValue) != 0))
{
result = OutSet.CreateInt(-integerValue);
}
else
{
// <seealso cref="UnaryOperationEvaluator.VisitIntegerValue" />
result = OutSet.CreateDouble(-TypeConversion.ToFloat(integerValue));
}
}
else
{
result = OutSet.CreateDouble(floatValue);
}
break;
case Operations.LogicNegation:
result = OutSet.CreateBool(!TypeConversion.ToBoolean(value.Value));
break;
case Operations.BitNegation:
// Bit negation is defined for every character, not for the entire string
// TODO: Implement. PHP string is stored as array of bytes, but printed in UTF8 encoding
result = OutSet.AnyStringValue;
break;
case Operations.Int32Cast:
result = TypeConversion.ToInteger(OutSet, value);
break;
case Operations.FloatCast:
case Operations.DoubleCast:
result = TypeConversion.ToFloat(Snapshot, value);
break;
default:
base.VisitStringValue(value);
break;
}
}
