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46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
52 #ifndef Patternist_RangeExpression_H
53 #define Patternist_RangeExpression_H
55 #include <private/qpaircontainer_p.h>
65 * @short Implements XPath 2.0's @c to expression.
67 * Despite its name, RangeExpression is not related to RangeVariableDeclaration.
69 * @see <a href="http://www.w3.org/TR/xpath20/#construct_seq">XML Path Language
70 * (XPath) 2.0, 3.3.1 Constructing Sequences</a>
72 * @author Frans Englich <frans.englich@nokia.com>
73 * @ingroup Patternist_expressions
75 class RangeExpression : public PairContainer
78 RangeExpression(const Expression::Ptr &operand1, const Expression::Ptr &operand2);
80 virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const;
82 * It's likely that this function gets called if staticType() inferred
83 * the cardinality to an exact number. In that case, we know that the
84 * first arguments is the same as the second argument.
86 virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
88 virtual SequenceType::List expectedOperandTypes() const;
91 * @returns always CommonSequenceTypes::ZeroOrMoreIntegers
93 virtual SequenceType::Ptr staticType() const;
96 * Disables compression for optimization reasons. For example, the
97 * expression "1 to 1000" would consume thousand allocated instances
98 * of Integer, and RangeIterator is well suited for dynamic evaluation.
100 * @returns Expression::DisableElimination
102 virtual Expression::Properties properties() const;
104 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;