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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 #include "qdocumentprojector_p.h" |
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43 |
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44 QT_BEGIN_NAMESPACE |
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45 |
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46 using namespace QPatternist; |
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47 |
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48 DocumentProjector::DocumentProjector(const ProjectedExpression::Vector &paths, |
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49 QAbstractXmlReceiver *const receiver) : m_paths(paths) |
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50 , m_pathCount(paths.count()) |
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51 , m_action(ProjectedExpression::Move) |
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52 , m_nodesInProcess(0) |
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53 , m_receiver(receiver) |
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54 { |
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55 Q_ASSERT_X(paths.count() > 0, Q_FUNC_INFO, |
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56 "Using DocumentProjector with no paths is an " |
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57 "overhead and has also undefined behavior."); |
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58 Q_ASSERT(m_receiver); |
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59 } |
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60 |
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61 void DocumentProjector::startElement(const QXmlName name) |
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62 { |
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63 Q_UNUSED(name); |
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64 |
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65 switch(m_action) |
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66 { |
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67 case ProjectedExpression::KeepSubtree: |
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68 { |
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69 m_receiver->startElement(name); |
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70 /* Fallthrough. */ |
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71 } |
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72 case ProjectedExpression::Skip: |
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73 { |
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74 ++m_nodesInProcess; |
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75 return; |
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76 } |
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77 default: |
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78 { |
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79 Q_ASSERT_X(m_action == ProjectedExpression::Move, Q_FUNC_INFO, |
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80 "We're not supposed to receive Keep here, because " |
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81 "endElement() should always end that state."); |
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82 |
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83 for(int i = 0; i < m_pathCount; ++i) |
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84 { |
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85 m_action = m_paths.at(i)->actionForElement(name, m_paths[i]); |
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86 |
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87 switch(m_action) |
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88 { |
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89 case ProjectedExpression::Keep: |
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90 { |
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91 m_action = ProjectedExpression::Keep; |
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92 continue; |
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93 } |
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94 case ProjectedExpression::KeepSubtree: |
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95 { |
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96 /* Ok, at least one path wanted this node. Pass it on, |
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97 * and exit. */ |
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98 m_receiver->startElement(name); |
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99 ++m_nodesInProcess; |
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100 return; |
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101 } |
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102 case ProjectedExpression::Skip: |
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103 { |
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104 /* This particular path doesn't need it, but |
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105 * some other path might, so continue looping. */ |
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106 continue; |
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107 } |
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108 case ProjectedExpression::Move: |
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109 Q_ASSERT_X(false, Q_FUNC_INFO, "The action functions can never return Move."); |
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110 } |
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111 } |
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112 |
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113 ++m_nodesInProcess; |
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114 |
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115 if(m_action == ProjectedExpression::Keep) |
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116 m_receiver->startElement(name); |
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117 else |
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118 { |
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119 Q_ASSERT(m_action == ProjectedExpression::Skip); |
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120 } |
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121 } |
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122 } |
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123 } |
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124 |
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125 void DocumentProjector::endElement() |
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126 { |
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127 if(m_action == ProjectedExpression::Keep) |
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128 { |
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129 Q_ASSERT(m_nodesInProcess == 1); |
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130 |
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131 m_receiver->endElement(); |
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132 |
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133 /* We have now kept the single node, and now wants to skip |
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134 * all its children. */ |
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135 m_action = ProjectedExpression::Skip; |
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136 m_nodesInProcess = 0; |
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137 } |
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138 else if(m_action == ProjectedExpression::KeepSubtree) |
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139 { |
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140 m_receiver->endElement(); |
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141 --m_nodesInProcess; |
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142 |
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143 if(m_nodesInProcess == 0) |
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144 { |
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145 /* We have now skipped all the children, let's do |
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146 * a new path analysis. */ |
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147 m_action = ProjectedExpression::Move; |
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148 } |
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149 } |
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150 else |
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151 { |
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152 Q_ASSERT_X(m_action == ProjectedExpression::Skip, Q_FUNC_INFO, |
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153 "We're not supposed to be in a Move action here."); |
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154 /* We skip calling m_receiver's endElement() here since we're |
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155 * skipping. */ |
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156 Q_ASSERT(m_nodesInProcess > 0); |
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157 --m_nodesInProcess; |
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158 |
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159 if(m_nodesInProcess == 0) |
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160 { |
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161 /* Ok, we've skipped them all, let's do something |
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162 * new -- let's Move on to the next path! */ |
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163 m_action = ProjectedExpression::Move; |
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164 } |
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165 } |
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166 } |
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167 |
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168 void DocumentProjector::attribute(const QXmlName name, |
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169 const QString &value) |
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170 { |
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171 Q_UNUSED(name); |
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172 Q_UNUSED(value); |
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173 } |
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174 |
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175 void DocumentProjector::namespaceBinding(const QXmlName nb) |
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176 { |
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177 Q_UNUSED(nb); |
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178 } |
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179 |
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180 void DocumentProjector::comment(const QString &value) |
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181 { |
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182 Q_ASSERT_X(!value.contains(QLatin1String("--")), Q_FUNC_INFO, |
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183 "Invalid input; it's the caller's responsibility to ensure the input is correct."); |
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184 Q_UNUSED(value); |
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185 } |
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186 |
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187 void DocumentProjector::characters(const QString &value) |
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188 { |
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189 Q_UNUSED(value); |
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190 } |
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191 |
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192 void DocumentProjector::processingInstruction(const QXmlName name, |
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193 const QString &value) |
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194 { |
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195 Q_ASSERT_X(!value.contains(QLatin1String("?>")), Q_FUNC_INFO, |
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196 "Invalid input; it's the caller's responsibility to ensure the input is correct."); |
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197 Q_UNUSED(name); |
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198 Q_UNUSED(value); |
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199 } |
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200 |
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201 void DocumentProjector::item(const Item &outputItem) |
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202 { |
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203 Q_UNUSED(outputItem); |
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204 } |
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205 |
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206 void DocumentProjector::startDocument() |
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207 { |
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208 } |
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209 |
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210 void DocumentProjector::endDocument() |
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211 { |
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212 } |
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213 |
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214 QT_END_NAMESPACE |