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39 | |
40 | // |
41 | // W A R N I N G |
42 | // ------------- |
43 | // |
44 | // This file is not part of the Qt API. It exists purely as an |
45 | // implementation detail. This header file may change from version to |
46 | // version without notice, or even be removed. |
47 | // |
48 | // We mean it. |
49 | |
50 | #ifndef Patternist_RangeExpression_H |
51 | #define Patternist_RangeExpression_H |
52 | |
53 | #include <private/qpaircontainer_p.h> |
54 | |
55 | QT_BEGIN_NAMESPACE |
56 | |
57 | namespace QPatternist |
58 | { |
59 | |
60 | /** |
61 | * @short Implements XPath 2.0's @c to expression. |
62 | * |
63 | * Despite its name, RangeExpression is not related to RangeVariableDeclaration. |
64 | * |
65 | * @see <a href="http://www.w3.org/TR/xpath20/#construct_seq">XML Path Language |
66 | * (XPath) 2.0, 3.3.1 Constructing Sequences</a> |
67 | * @see RangeIterator |
68 | * @author Frans Englich <frans.englich@nokia.com> |
69 | * @ingroup Patternist_expressions |
70 | */ |
71 | class RangeExpression : public PairContainer |
72 | { |
73 | public: |
74 | RangeExpression(const Expression::Ptr &operand1, const Expression::Ptr &operand2); |
75 | |
76 | virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const; |
77 | /** |
78 | * It's likely that this function gets called if staticType() inferred |
79 | * the cardinality to an exact number. In that case, we know that the |
80 | * first arguments is the same as the second argument. |
81 | */ |
82 | virtual Item evaluateSingleton(const DynamicContext::Ptr &) const; |
83 | |
84 | virtual SequenceType::List expectedOperandTypes() const; |
85 | |
86 | /** |
87 | * @returns always CommonSequenceTypes::ZeroOrMoreIntegers |
88 | */ |
89 | virtual SequenceType::Ptr staticType() const; |
90 | |
91 | /** |
92 | * Disables compression for optimization reasons. For example, the |
93 | * expression "1 to 1000" would consume thousand allocated instances |
94 | * of Integer, and RangeIterator is well suited for dynamic evaluation. |
95 | * |
96 | * @returns Expression::DisableElimination |
97 | */ |
98 | virtual Expression::Properties properties() const; |
99 | |
100 | virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
101 | }; |
102 | } |
103 | |
104 | QT_END_NAMESPACE |
105 | |
106 | #endif |
107 | |