1 | /****************************************************************************
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2 | **
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3 | ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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4 | ** All rights reserved.
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5 | ** Contact: Nokia Corporation ([email protected])
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6 | **
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7 | ** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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8 | **
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9 | ** $QT_BEGIN_LICENSE:LGPL$
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10 | ** Commercial Usage
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11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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12 | ** accordance with the Qt Commercial License Agreement provided with the
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13 | ** Software or, alternatively, in accordance with the terms contained in
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14 | ** a written agreement between you and Nokia.
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15 | **
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16 | ** GNU Lesser General Public License Usage
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17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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18 | ** General Public License version 2.1 as published by the Free Software
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19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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20 | ** packaging of this file. Please review the following information to
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21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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23 | **
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24 | ** In addition, as a special exception, Nokia gives you certain additional
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25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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27 | **
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28 | ** GNU General Public License Usage
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29 | ** Alternatively, this file may be used under the terms of the GNU
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30 | ** General Public License version 3.0 as published by the Free Software
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31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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32 | ** packaging of this file. Please review the following information to
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33 | ** ensure the GNU General Public License version 3.0 requirements will be
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34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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35 | **
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36 | ** If you have questions regarding the use of this file, please contact
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37 | ** Nokia at [email protected].
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38 | ** $QT_END_LICENSE$
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39 | **
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40 | ****************************************************************************/
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41 |
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42 | //
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43 | // W A R N I N G
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44 | // -------------
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45 | //
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46 | // This file is not part of the Qt API. It exists purely as an
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47 | // implementation detail. This header file may change from version to
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48 | // version without notice, or even be removed.
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49 | //
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50 | // We mean it.
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51 |
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52 | #ifndef Patternist_ParserContext_H
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53 | #define Patternist_ParserContext_H
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54 |
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55 | #include <QFlags>
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56 | #include <QSharedData>
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57 | #include <QStack>
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58 | #include <QStringList>
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59 | #include <QtGlobal>
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60 | #include <QXmlQuery>
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61 |
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62 | #include "qbuiltintypes_p.h"
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63 | #include "qfunctionsignature_p.h"
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64 | #include "qorderby_p.h"
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65 | #include "qtemplatemode_p.h"
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66 | #include "quserfunctioncallsite_p.h"
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67 | #include "quserfunction_p.h"
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68 | #include "qvariabledeclaration_p.h"
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69 |
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70 | QT_BEGIN_HEADER
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71 |
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72 | QT_BEGIN_NAMESPACE
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73 |
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74 | namespace QPatternist
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75 | {
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76 | class Tokenizer;
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77 |
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78 | /**
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79 | * @short Contains data used when parsing and tokenizing.
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80 | *
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81 | * When ExpressionFactory::create() is called, an instance of this class
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82 | * is passed to the scanner and parser. It holds all information that is
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83 | * needed to create the expression.
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84 | *
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85 | * @author Frans Englich <[email protected]>
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86 | */
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87 | class ParserContext : public QSharedData
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88 | {
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89 | public:
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90 | typedef QExplicitlySharedDataPointer<ParserContext> Ptr;
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91 |
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92 | enum PrologDeclaration
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93 | {
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94 | BoundarySpaceDecl = 1,
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95 | DefaultCollationDecl = 2,
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96 | BaseURIDecl = 4,
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97 | ConstructionDecl = 8,
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98 | OrderingModeDecl = 16,
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99 | EmptyOrderDecl = 32,
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100 | CopyNamespacesDecl = 64,
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101 | DeclareDefaultElementNamespace = 128,
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102 | DeclareDefaultFunctionNamespace = 256
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103 | };
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104 |
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105 | typedef QFlags<PrologDeclaration> PrologDeclarations;
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106 |
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107 | /**
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108 | * Constructs a ParserContext instance.
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109 | *
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110 | * @param context the static context as defined in XPath. This contain
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111 | * namespace bindings, error handler, and other information necessary
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112 | * for creating an XPath expression.
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113 | * @param lang the particular XPath language sub-set that should be parsed
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114 | * @param tokenizer the Tokenizer to use.
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115 | * @see ExpressionFactory::LanguageAccent
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116 | */
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117 | ParserContext(const StaticContext::Ptr &context,
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118 | const QXmlQuery::QueryLanguage lang,
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119 | Tokenizer *const tokenizer);
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120 |
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121 | /**
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122 | * @short Removes the recently pushed variables from
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123 | * scope. The amount of removed variables is @p amount.
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124 | *
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125 | * finalizePushedVariable() can be seen as popping the variable.
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126 | *
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127 | */
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128 | void finalizePushedVariable(const int amount = 1,
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129 | const bool shouldPop = true);
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130 |
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131 | inline VariableSlotID allocatePositionalSlot()
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132 | {
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133 | ++m_positionSlot;
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134 | return m_positionSlot;
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135 | }
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136 |
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137 | inline VariableSlotID allocateExpressionSlot()
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138 | {
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139 | const VariableSlotID retval = m_expressionSlot;
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140 | ++m_expressionSlot;
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141 | return retval;
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142 | }
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143 |
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144 | inline VariableSlotID allocateGlobalVariableSlot()
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145 | {
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146 | ++m_globalVariableSlot;
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147 | return m_globalVariableSlot;
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148 | }
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149 |
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150 | inline bool hasDeclaration(const PrologDeclaration decl) const
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151 | {
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152 | return m_prologDeclarations.testFlag(decl);
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153 | }
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154 |
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155 | inline void registerDeclaration(const PrologDeclaration decl)
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156 | {
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157 | m_prologDeclarations |= decl;
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158 | }
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159 |
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160 | /**
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161 | * The namespaces declared with <tt>declare namespace</tt>.
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162 | */
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163 | QStringList declaredPrefixes;
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