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| ** Copyright (C) 2016 The Qt Company Ltd. |
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| ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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| ** Alternatively, this file may be used under the terms of the GNU |
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| ** Public license version 3 or any later version approved by the KDE Free |
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| |
| #include "qitem_p.h" |
| #include "qboolean_p.h" |
| #include "qbuiltintypes_p.h" |
| #include "qcommonsequencetypes_p.h" |
| #include "qemptysequence_p.h" |
| #include "qoptimizationpasses_p.h" |
| |
| #include "qvaluecomparison_p.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| using namespace QPatternist; |
| |
| ValueComparison::ValueComparison(const Expression::Ptr &op1, |
| const AtomicComparator::Operator op, |
| const Expression::Ptr &op2) : PairContainer(op1, op2), |
| m_operator(op) |
| { |
| } |
| |
| /*! \internal */ |
| ValueComparison::~ValueComparison() |
| { |
| } |
| |
| Item ValueComparison::evaluateSingleton(const DynamicContext::Ptr &context) const |
| { |
| const Item it1(m_operand1->evaluateSingleton(context)); |
| if(!it1) |
| return Item(); |
| |
| const Item it2(m_operand2->evaluateSingleton(context)); |
| if(!it2) |
| return Item(); |
| |
| return Boolean::fromValue(flexibleCompare(it1, it2, context)); |
| } |
| |
| Expression::Ptr ValueComparison::typeCheck(const StaticContext::Ptr &context, |
| const SequenceType::Ptr &reqType) |
| { |
| const Expression::Ptr me(PairContainer::typeCheck(context, reqType)); |
| const ItemType::Ptr t1(m_operand1->staticType()->itemType()); |
| const ItemType::Ptr t2(m_operand2->staticType()->itemType()); |
| Q_ASSERT(t1); |
| Q_ASSERT(t2); |
| |
| if(*CommonSequenceTypes::Empty == *t1 || |
| *CommonSequenceTypes::Empty == *t2) |
| { |
| return EmptySequence::create(this, context); |
| } |
| else |
| { |
| prepareComparison(fetchComparator(t1, t2, context)); |
| |
| return me; |
| } |
| } |
| |
| Expression::Ptr ValueComparison::compress(const StaticContext::Ptr &context) |
| { |
| const Expression::Ptr me(PairContainer::compress(context)); |
| |
| if(me != this) |
| return me; |
| |
| if(isCaseInsensitiveCompare(m_operand1, m_operand2)) |
| useCaseInsensitiveComparator(); |
| |
| return me; |
| } |
| |
| bool ValueComparison::isCaseInsensitiveCompare(Expression::Ptr &op1, Expression::Ptr &op2) |
| { |
| Q_ASSERT(op1); |
| Q_ASSERT(op2); |
| |
| const ID iD = op1->id(); |
| |
| if((iD == IDLowerCaseFN || iD == IDUpperCaseFN) && iD == op2->id()) |
| { |
| /* Both are either fn:lower-case() or fn:upper-case(). */ |
| |
| /* Replace the calls to the functions with its operands. */ |
| op1 = op1->operands().first(); |
| op2 = op2->operands().first(); |
| |
| return true; |
| } |
| else |
| return false; |
| } |
| |
| OptimizationPass::List ValueComparison::optimizationPasses() const |
| { |
| return OptimizationPasses::comparisonPasses; |
| } |
| |
| SequenceType::List ValueComparison::expectedOperandTypes() const |
| { |
| SequenceType::List result; |
| result.append(CommonSequenceTypes::ZeroOrOneAtomicType); |
| result.append(CommonSequenceTypes::ZeroOrOneAtomicType); |
| return result; |
| } |
| |
| SequenceType::Ptr ValueComparison::staticType() const |
| { |
| if(m_operand1->staticType()->cardinality().allowsEmpty() || |
| m_operand2->staticType()->cardinality().allowsEmpty()) |
| return CommonSequenceTypes::ZeroOrOneBoolean; |
| else |
| return CommonSequenceTypes::ExactlyOneBoolean; |
| } |
| |
| ExpressionVisitorResult::Ptr ValueComparison::accept(const ExpressionVisitor::Ptr &visitor) const |
| { |
| return visitor->visit(this); |
| } |
| |
| Expression::ID ValueComparison::id() const |
| { |
| return IDValueComparison; |
| } |
| |
| QT_END_NAMESPACE |