protected final function IsExpressionConstant(CoreExpression $Expression)
{
switch (true) {
case $Expression instanceof ConstantExpression:
return true;
case $Expression instanceof ColumnExpression:
return false;
case $Expression instanceof UnaryOperationExpression:
return $this->IsExpressionConstant($Expression->GetOperandExpression());
case $Expression instanceof BinaryOperationExpression:
return $this->IsExpressionConstant($Expression->GetLeftOperandExpression()) && $this->IsExpressionConstant($Expression->GetRightOperandExpression());
case $Expression instanceof CompoundBooleanExpression:
return $this->AreExpressionsConstant($Expression->GetBooleanExpressions());
case $Expression instanceof FunctionCallExpression:
return $this->AreExpressionsConstant($Expression->GetArgumentValueListExpression()->GetValueExpressions());
default:
return false;
}
}
public function MapBinaryOperationExpression(CoreExpression $LeftOperandExpression, $BinaryOperator, CoreExpression $RightOperandExpression)
{
if ($LeftOperandExpression instanceof E\BinaryOperationExpression) {
$NestedOperand = $LeftOperandExpression->GetLeftOperandExpression();
if ($NestedOperand instanceof E\FunctionCallExpression && $NestedOperand->GetName() === 'LOCATE') {
if ($RightOperandExpression instanceof EE\ConstantExpression && $RightOperandExpression->GetValue() === false) {
$RightOperandExpression = Expression::Constant(-1);
}
}
}
switch ($BinaryOperator) {
case O\Binary::Concatenation:
return new E\FunctionCallExpression('CONCAT', Expression::ValueList([$LeftOperandExpression, $RightOperandExpression]));
case O\Binary::Power:
return new E\FunctionCallExpression('POW', Expression::ValueList([$LeftOperandExpression, $RightOperandExpression]));
case O\Binary::NullSafeInequality:
return Expression::UnaryOperation(O\Unary::Not, Expression::BinaryOperation($LeftOperandExpression, O\Binary::NullSafeEquality, $RightOperandExpression));
default:
return new E\BinaryOperationExpression($LeftOperandExpression, $BinaryOperator, $RightOperandExpression);
}
}