1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the QtXmlPatterns module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 3 as published by the Free Software 20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 21 ** packaging of this file. Please review the following information to 22 ** ensure the GNU Lesser General Public License version 3 requirements 23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 24 ** 25 ** GNU General Public License Usage 26 ** Alternatively, this file may be used under the terms of the GNU 27 ** General Public License version 2.0 or (at your option) the GNU General 28 ** Public license version 3 or any later version approved by the KDE Free 29 ** Qt Foundation. The licenses are as published by the Free Software 30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 31 ** included in the packaging of this file. Please review the following 32 ** information to ensure the GNU General Public License requirements will 33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 34 ** https://www.gnu.org/licenses/gpl-3.0.html. 35 ** 36 ** $QT_END_LICENSE$ 37 ** 38 ****************************************************************************/ 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