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39
40#include "qcommonsequencetypes_p.h"
41#include "qexpressionsequence_p.h"
42#include "qsorttuple_p.h"
43
44#include "qreturnorderby_p.h"
45
46QT_BEGIN_NAMESPACE
47
48using namespace QPatternist;
49
50ReturnOrderBy::ReturnOrderBy(const OrderBy::Stability aStability,
51 const OrderBy::OrderSpec::Vector &oSpecs,
52 const Expression::List &ops) : UnlimitedContainer(ops)
53 , m_stability(aStability)
54 , m_orderSpecs(oSpecs)
55 , m_flyAway(true)
56{
57 Q_ASSERT_X(m_operands.size() >= 2, Q_FUNC_INFO,
58 "ReturnOrderBy must have the return expression, and at least one sort key.");
59 Q_ASSERT(m_orderSpecs.size() == ops.size() - 1);
60}
61
62Item ReturnOrderBy::evaluateSingleton(const DynamicContext::Ptr &context) const
63{
64 Q_ASSERT(m_operands.size() > 1);
65 const Item::Iterator::Ptr value(makeListIterator(list: m_operands.first()->evaluateSequence(context)->toList()));
66 Item::Vector sortKeys;
67
68 /* We're skipping the first operand. */
69 const int len = m_operands.size() - 1;
70 sortKeys.resize(asize: len);
71
72 for(int i = 1; i <= len; ++i)
73 sortKeys[i - 1] = m_operands.at(i)->evaluateSingleton(context);
74
75 return Item(new SortTuple(value, sortKeys));
76}
77
78bool ReturnOrderBy::evaluateEBV(const DynamicContext::Ptr &context) const
79{
80 // TODO This is temporary code.
81 return m_operands.first()->evaluateEBV(context);
82}
83
84Expression::Ptr ReturnOrderBy::compress(const StaticContext::Ptr &context)
85{
86 /* We first did this in typeCheck(), but that broke due to that type checks were
87 * missed, which other pieces relied on. */
88 if(m_flyAway)
89 {
90 /* We only want the return expression, not the sort keys. */
91 return m_operands.first()->compress(context);
92 }
93 else
94 {
95 /* We don't need the members, so don't keep a reference to them. */
96 m_orderSpecs.clear();
97
98 return UnlimitedContainer::compress(context);
99 }
100}
101
102Expression::Properties ReturnOrderBy::properties() const
103{
104 /* For some unknown reason this is necessary for XQTS test case orderBy18. */
105 return DisableElimination;
106}
107
108ExpressionVisitorResult::Ptr ReturnOrderBy::accept(const ExpressionVisitor::Ptr &visitor) const
109{
110 return visitor->visit(this);
111}
112
113SequenceType::Ptr ReturnOrderBy::staticType() const
114{
115 return m_operands.first()->staticType();
116}
117
118SequenceType::List ReturnOrderBy::expectedOperandTypes() const
119{
120 SequenceType::List result;
121 result.append(t: CommonSequenceTypes::ZeroOrMoreItems);
122 result.append(t: CommonSequenceTypes::ZeroOrOneAtomicType);
123 return result;
124}
125
126Expression::ID ReturnOrderBy::id() const
127{
128 return IDReturnOrderBy;
129}
130
131QT_END_NAMESPACE
132

source code of qtxmlpatterns/src/xmlpatterns/expr/qreturnorderby.cpp