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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
55QT_BEGIN_NAMESPACE
56
57namespace 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
104QT_END_NAMESPACE
105
106#endif
107

source code of qtxmlpatterns/src/xmlpatterns/expr/qrangeexpression_p.h