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43 #include "qboolean_p.h"
44 #include "qbuiltintypes_p.h"
45 #include "qcommonsequencetypes_p.h"
46 #include "qemptysequence_p.h"
47 #include "qoptimizationpasses_p.h"
49 #include "qvaluecomparison_p.h"
53 using namespace QPatternist;
55 ValueComparison::ValueComparison(const Expression::Ptr &op1,
56 const AtomicComparator::Operator op,
57 const Expression::Ptr &op2) : PairContainer(op1, op2),
62 Item ValueComparison::evaluateSingleton(const DynamicContext::Ptr &context) const
64 const Item it1(m_operand1->evaluateSingleton(context));
68 const Item it2(m_operand2->evaluateSingleton(context));
72 return Boolean::fromValue(flexibleCompare(it1, it2, context));
75 Expression::Ptr ValueComparison::typeCheck(const StaticContext::Ptr &context,
76 const SequenceType::Ptr &reqType)
78 const Expression::Ptr me(PairContainer::typeCheck(context, reqType));
79 const ItemType::Ptr t1(m_operand1->staticType()->itemType());
80 const ItemType::Ptr t2(m_operand2->staticType()->itemType());
84 if(*CommonSequenceTypes::Empty == *t1 ||
85 *CommonSequenceTypes::Empty == *t2)
87 return EmptySequence::create(this, context);
91 prepareComparison(fetchComparator(t1, t2, context));
97 Expression::Ptr ValueComparison::compress(const StaticContext::Ptr &context)
99 const Expression::Ptr me(PairContainer::compress(context));
104 if(isCaseInsensitiveCompare(m_operand1, m_operand2))
105 useCaseInsensitiveComparator();
110 bool ValueComparison::isCaseInsensitiveCompare(Expression::Ptr &op1, Expression::Ptr &op2)
115 const ID iD = op1->id();
117 if((iD == IDLowerCaseFN || iD == IDUpperCaseFN) && iD == op2->id())
119 /* Both are either fn:lower-case() or fn:upper-case(). */
121 /* Replace the calls to the functions with its operands. */
122 op1 = op1->operands().first();
123 op2 = op2->operands().first();
131 OptimizationPass::List ValueComparison::optimizationPasses() const
133 return OptimizationPasses::comparisonPasses;
136 SequenceType::List ValueComparison::expectedOperandTypes() const
138 SequenceType::List result;
139 result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
140 result.append(CommonSequenceTypes::ZeroOrOneAtomicType);
144 SequenceType::Ptr ValueComparison::staticType() const
146 if(m_operand1->staticType()->cardinality().allowsEmpty() ||
147 m_operand2->staticType()->cardinality().allowsEmpty())
148 return CommonSequenceTypes::ZeroOrOneBoolean;
150 return CommonSequenceTypes::ExactlyOneBoolean;
153 ExpressionVisitorResult::Ptr ValueComparison::accept(const ExpressionVisitor::Ptr &visitor) const
155 return visitor->visit(this);
158 Expression::ID ValueComparison::id() const
160 return IDValueComparison;