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42 #include "qcommonsequencetypes_p.h"
43 #include "qgenericsequencetype_p.h"
44 #include "qoptimizationpasses_p.h"
46 #include "qifthenclause_p.h"
50 using namespace QPatternist;
52 IfThenClause::IfThenClause(const Expression::Ptr &test,
53 const Expression::Ptr &then,
54 const Expression::Ptr &el) : TripleContainer(test, then, el)
58 Item::Iterator::Ptr IfThenClause::evaluateSequence(const DynamicContext::Ptr &context) const
60 return m_operand1->evaluateEBV(context)
61 ? m_operand2->evaluateSequence(context)
62 : m_operand3->evaluateSequence(context);
65 Item IfThenClause::evaluateSingleton(const DynamicContext::Ptr &context) const
67 return m_operand1->evaluateEBV(context)
68 ? m_operand2->evaluateSingleton(context)
69 : m_operand3->evaluateSingleton(context);
72 bool IfThenClause::evaluateEBV(const DynamicContext::Ptr &context) const
74 return m_operand1->evaluateEBV(context)
75 ? m_operand2->evaluateEBV(context)
76 : m_operand3->evaluateEBV(context);
79 void IfThenClause::evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const
81 if(m_operand1->evaluateEBV(context))
82 m_operand2->evaluateToSequenceReceiver(context);
84 m_operand3->evaluateToSequenceReceiver(context);
87 Expression::Ptr IfThenClause::compress(const StaticContext::Ptr &context)
89 const Expression::Ptr me(TripleContainer::compress(context));
94 /* All operands mustn't be evaluated in order for const folding to
95 * be possible. Let's see how far we get. */
97 if(m_operand1->isEvaluated())
99 if(m_operand1->evaluateEBV(context->dynamicContext()))
108 QList<QExplicitlySharedDataPointer<OptimizationPass> > IfThenClause::optimizationPasses() const
110 return OptimizationPasses::ifThenPasses;
113 SequenceType::List IfThenClause::expectedOperandTypes() const
115 SequenceType::List result;
116 result.append(CommonSequenceTypes::EBV);
117 result.append(CommonSequenceTypes::ZeroOrMoreItems);
118 result.append(CommonSequenceTypes::ZeroOrMoreItems);
122 SequenceType::Ptr IfThenClause::staticType() const
124 const SequenceType::Ptr t1(m_operand2->staticType());
125 const SequenceType::Ptr t2(m_operand3->staticType());
127 return makeGenericSequenceType(t1->itemType() | t2->itemType(),
128 t1->cardinality() | t2->cardinality());
131 ExpressionVisitorResult::Ptr IfThenClause::accept(const ExpressionVisitor::Ptr &visitor) const
133 return visitor->visit(this);
136 Expression::ID IfThenClause::id() const
138 return IDIfThenClause;
142 Expression::Properties IfThenClause::properties() const
144 return m_operand1->properties()
145 | m_operand2->properties()
146 | m_operand3->properties()
147 & ( Expression::RequiresFocus
148 | Expression::IsEvaluated
149 | Expression::DisableElimination);