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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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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 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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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 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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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_AxisStep_H |
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53 #define Patternist_AxisStep_H |
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54 |
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55 #include "qemptycontainer_p.h" |
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56 #include "qitem_p.h" |
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57 |
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58 QT_BEGIN_HEADER |
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59 |
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60 QT_BEGIN_NAMESPACE |
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61 |
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62 namespace QPatternist |
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63 { |
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64 /** |
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65 * @short A step in a path expression that with an axis and a node test evaluates |
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66 * to a sequence of nodes from the context item. |
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67 * |
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68 * @author Frans Englich <frans.englich@nokia.com> |
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69 * @ingroup Patternist_expressions |
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70 */ |
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71 class Q_AUTOTEST_EXPORT AxisStep : public EmptyContainer |
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72 { |
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73 public: |
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74 AxisStep(const QXmlNodeModelIndex::Axis axis, |
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75 const ItemType::Ptr &nodeTest); |
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76 |
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77 virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const; |
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78 virtual Item evaluateSingleton(const DynamicContext::Ptr &) const; |
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79 |
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80 /** |
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81 * Returns @p node if it matches the node test this step is using, otherwise @c null. |
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82 */ |
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83 inline Item mapToItem(const QXmlNodeModelIndex &node, |
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84 const DynamicContext::Ptr &context) const; |
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85 |
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86 virtual SequenceType::List expectedOperandTypes() const; |
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87 virtual SequenceType::Ptr staticType() const; |
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88 |
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89 /** |
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90 * Rewrites to ParentNodeAxis, if possible. |
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91 */ |
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92 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, |
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93 const SequenceType::Ptr &reqType); |
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94 |
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95 /** |
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96 * @returns always BuiltinTypes::node; |
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97 */ |
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98 virtual ItemType::Ptr expectedContextItemType() const; |
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99 |
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100 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
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101 |
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102 virtual Properties properties() const; |
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103 |
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104 /** |
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105 * @returns the axis this step is using. |
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106 */ |
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107 QXmlNodeModelIndex::Axis axis() const; |
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108 |
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109 /** |
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110 * @returns the node test this step is using. |
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111 */ |
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112 inline ItemType::Ptr nodeTest() const |
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113 { |
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114 return m_nodeTest; |
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115 } |
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116 |
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117 void setNodeTest(const ItemType::Ptr &nev) |
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118 { |
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119 m_nodeTest = nev; |
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120 } |
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121 |
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122 /** |
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123 * @short Prints the EBNF name corresponding to @p axis. |
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124 * |
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125 * For instance, for QXmlNodeModelIndex::Child, "child" is returned. |
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126 * |
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127 * Apart from being used in this class, it is used in the SDK. |
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128 */ |
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129 static QString axisName(const QXmlNodeModelIndex::Axis axis); |
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130 |
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131 virtual ID id() const; |
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132 virtual PatternPriority patternPriority() const; |
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133 |
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134 inline void setAxis(const QXmlNodeModelIndex::Axis newAxis); |
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135 |
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136 private: |
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137 typedef QExplicitlySharedDataPointer<const AxisStep> ConstPtr; |
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138 |
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139 static const QXmlNodeModelIndex::NodeKind s_whenAxisNodeKindEmpty[]; |
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140 |
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141 /** |
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142 * @returns @c true when the axis @p axis and a node test testing node of |
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143 * type @p nodeKind always produces an empty sequence. One such example |
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144 * is <tt>attribute::comment()</tt>. |
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145 */ |
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146 static bool isAlwaysEmpty(const QXmlNodeModelIndex::Axis axis, |
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147 const QXmlNodeModelIndex::NodeKind nodeKind); |
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148 |
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149 /** |
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150 * The reason this variable is mutable, is that in the case of XSL-T patterns, |
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151 * we do quite some reordering. |
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152 */ |
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153 QXmlNodeModelIndex::Axis m_axis; |
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154 ItemType::Ptr m_nodeTest; |
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155 }; |
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156 |
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157 void AxisStep::setAxis(const QXmlNodeModelIndex::Axis newAxis) |
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158 { |
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159 m_axis = newAxis; |
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160 } |
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161 |
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162 } |
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163 |
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164 QT_END_NAMESPACE |
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165 |
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166 QT_END_HEADER |
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167 |
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168 #endif |