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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_ProjectedExpression_H |
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53 #define Patternist_ProjectedExpression_H |
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54 |
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55 #include "qitem_p.h" |
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56 |
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57 QT_BEGIN_HEADER |
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58 |
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59 QT_BEGIN_NAMESPACE |
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60 |
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61 namespace QPatternist |
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62 { |
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63 class ProjectedExpression |
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64 { |
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65 public: |
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66 typedef ProjectedExpression * Ptr; |
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67 typedef QVector<ProjectedExpression::Ptr> Vector; |
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68 virtual ~ProjectedExpression() |
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69 { |
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70 } |
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71 |
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72 enum Action |
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73 { |
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74 Move = 0, |
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75 Skip = 1, |
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76 Keep = 2, |
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77 KeepSubtree = 4 | Keep |
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78 }; |
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79 |
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80 virtual Action actionForElement(const QXmlName name, |
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81 ProjectedExpression::Ptr &next) const |
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82 { |
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83 Q_UNUSED(name); |
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84 Q_UNUSED(next); |
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85 return Skip; |
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86 } |
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87 |
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88 }; |
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89 |
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90 class ProjectedNodeTest |
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91 { |
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92 public: |
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93 typedef ProjectedNodeTest * Ptr; |
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94 virtual ~ProjectedNodeTest() |
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95 { |
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96 } |
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97 |
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98 virtual bool isMatch(const QXmlNodeModelIndex::NodeKind kind) const |
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99 { |
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100 Q_UNUSED(kind); |
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101 return false; |
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102 } |
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103 }; |
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104 |
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105 class ProjectedStep : public ProjectedExpression |
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106 { |
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107 public: |
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108 ProjectedStep(const ProjectedNodeTest::Ptr test, |
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109 const QXmlNodeModelIndex::Axis axis) : m_test(test), |
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110 m_axis(axis) |
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111 { |
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112 Q_ASSERT(m_test); |
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113 } |
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114 |
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115 virtual Action actionForElement(const QXmlName name, |
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116 ProjectedExpression::Ptr &next) const |
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117 { |
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118 Q_UNUSED(name); |
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119 Q_UNUSED(next); |
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120 // TODO |
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121 return Skip; |
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122 } |
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123 |
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124 private: |
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125 const ProjectedNodeTest::Ptr m_test; |
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126 const QXmlNodeModelIndex::Axis m_axis; |
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127 }; |
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128 |
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129 class ProjectedPath : public ProjectedExpression |
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130 { |
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131 public: |
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132 ProjectedPath(const ProjectedExpression::Ptr left, |
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133 const ProjectedExpression::Ptr right) : m_left(left), |
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134 m_right(right) |
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135 { |
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136 Q_ASSERT(m_left); |
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137 Q_ASSERT(m_right); |
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138 } |
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139 |
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140 virtual Action actionForElement(const QXmlName name, |
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141 ProjectedExpression::Ptr &next) const |
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142 { |
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143 ProjectedExpression::Ptr &candidateNext = next; |
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144 const Action a = m_left->actionForElement(name, candidateNext); |
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145 |
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146 if(a != Skip) |
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147 { |
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148 /* The test accepted it, so let's replace us with the new step. */ |
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149 next = candidateNext; |
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150 } |
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151 |
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152 return a; |
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153 } |
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154 |
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155 private: |
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156 const ProjectedExpression::Ptr m_left; |
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157 const ProjectedExpression::Ptr m_right; |
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158 }; |
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159 } |
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160 |
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161 QT_END_NAMESPACE |
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162 |
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163 QT_END_HEADER |
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164 |
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165 #endif |