author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 17 Dec 2009 09:20:16 +0200 | |
changeset 36 | 0ed94ceaa377 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#if ENABLE(XPATH) |
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#include "XPathNodeSet.h" |
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|
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#include "Attr.h" |
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#include "Element.h" |
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#include "Node.h" |
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namespace WebCore { |
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namespace XPath { |
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static inline Node* parentWithDepth(unsigned depth, const Vector<Node*>& parents) |
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{ |
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ASSERT(parents.size() >= depth + 1); |
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return parents[parents.size() - 1 - depth]; |
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} |
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|
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static void sortBlock(unsigned from, unsigned to, Vector<Vector<Node*> >& parentMatrix, bool mayContainAttributeNodes) |
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{ |
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ASSERT(from + 1 < to); // Should not call this function with less that two nodes to sort. |
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unsigned minDepth = UINT_MAX; |
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for (unsigned i = from; i < to; ++i) { |
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unsigned depth = parentMatrix[i].size() - 1; |
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if (minDepth > depth) |
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minDepth = depth; |
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} |
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|
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// Find the common ancestor. |
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unsigned commonAncestorDepth = minDepth; |
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Node* commonAncestor; |
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while (true) { |
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commonAncestor = parentWithDepth(commonAncestorDepth, parentMatrix[from]); |
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if (commonAncestorDepth == 0) |
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break; |
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|
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bool allEqual = true; |
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for (unsigned i = from + 1; i < to; ++i) { |
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if (commonAncestor != parentWithDepth(commonAncestorDepth, parentMatrix[i])) { |
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allEqual = false; |
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break; |
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} |
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} |
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if (allEqual) |
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break; |
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|
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--commonAncestorDepth; |
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} |
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|
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if (commonAncestorDepth == minDepth) { |
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// One of the nodes is the common ancestor => it is the first in document order. |
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// Find it and move it to the beginning. |
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for (unsigned i = from; i < to; ++i) |
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if (commonAncestor == parentMatrix[i][0]) { |
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parentMatrix[i].swap(parentMatrix[from]); |
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if (from + 2 < to) |
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sortBlock(from + 1, to, parentMatrix, mayContainAttributeNodes); |
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return; |
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} |
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} |
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|
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if (mayContainAttributeNodes && commonAncestor->isElementNode()) { |
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// The attribute nodes and namespace nodes of an element occur before the children of the element. |
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// The namespace nodes are defined to occur before the attribute nodes. |
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// The relative order of namespace nodes is implementation-dependent. |
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// The relative order of attribute nodes is implementation-dependent. |
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unsigned sortedEnd = from; |
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// FIXME: namespace nodes are not implemented. |
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for (unsigned i = sortedEnd; i < to; ++i) { |
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Node* n = parentMatrix[i][0]; |
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if (n->isAttributeNode() && static_cast<Attr*>(n)->ownerElement() == commonAncestor) |
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parentMatrix[i].swap(parentMatrix[sortedEnd++]); |
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} |
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if (sortedEnd != from) { |
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if (to - sortedEnd > 1) |
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sortBlock(sortedEnd, to, parentMatrix, mayContainAttributeNodes); |
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return; |
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} |
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} |
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|
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// Children nodes of the common ancestor induce a subdivision of our node-set. |
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107 |
// Sort it according to this subdivision, and recursively sort each group. |
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108 |
HashSet<Node*> parentNodes; |
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109 |
for (unsigned i = from; i < to; ++i) |
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parentNodes.add(parentWithDepth(commonAncestorDepth + 1, parentMatrix[i])); |
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111 |
|
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112 |
unsigned previousGroupEnd = from; |
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unsigned groupEnd = from; |
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114 |
for (Node* n = commonAncestor->firstChild(); n; n = n->nextSibling()) { |
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115 |
// If parentNodes contains the node, perform a linear search to move its children in the node-set to the beginning. |
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116 |
if (parentNodes.contains(n)) { |
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117 |
for (unsigned i = groupEnd; i < to; ++i) |
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118 |
if (parentWithDepth(commonAncestorDepth + 1, parentMatrix[i]) == n) |
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119 |
parentMatrix[i].swap(parentMatrix[groupEnd++]); |
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120 |
|
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121 |
if (groupEnd - previousGroupEnd > 1) |
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122 |
sortBlock(previousGroupEnd, groupEnd, parentMatrix, mayContainAttributeNodes); |
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123 |
|
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124 |
ASSERT(previousGroupEnd != groupEnd); |
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125 |
previousGroupEnd = groupEnd; |
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126 |
#ifndef NDEBUG |
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parentNodes.remove(n); |
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128 |
#endif |
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129 |
} |
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130 |
} |
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131 |
|
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132 |
ASSERT(parentNodes.isEmpty()); |
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133 |
} |
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134 |
|
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135 |
void NodeSet::sort() const |
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136 |
{ |
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137 |
if (m_isSorted) |
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138 |
return; |
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139 |
|
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140 |
unsigned nodeCount = m_nodes.size(); |
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141 |
if (nodeCount < 2) { |
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142 |
const_cast<bool&>(m_isSorted) = true; |
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143 |
return; |
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144 |
} |
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145 |
|
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146 |
bool containsAttributeNodes = false; |
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147 |
|
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148 |
Vector<Vector<Node*> > parentMatrix(nodeCount); |
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149 |
for (unsigned i = 0; i < nodeCount; ++i) { |
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150 |
Vector<Node*>& parentsVector = parentMatrix[i]; |
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151 |
Node* n = m_nodes[i].get(); |
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152 |
parentsVector.append(n); |
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153 |
if (n->isAttributeNode()) { |
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154 |
n = static_cast<Attr*>(n)->ownerElement(); |
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155 |
parentsVector.append(n); |
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156 |
containsAttributeNodes = true; |
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157 |
} |
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158 |
while ((n = n->parent())) |
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159 |
parentsVector.append(n); |
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160 |
} |
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161 |
sortBlock(0, nodeCount, parentMatrix, containsAttributeNodes); |
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162 |
|
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163 |
// It is not possible to just assign the result to m_nodes, because some nodes may get dereferenced and destroyed. |
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164 |
Vector<RefPtr<Node> > sortedNodes; |
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165 |
sortedNodes.reserveCapacity(nodeCount); |
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166 |
for (unsigned i = 0; i < nodeCount; ++i) |
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167 |
sortedNodes.append(parentMatrix[i][0]); |
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168 |
|
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169 |
const_cast<Vector<RefPtr<Node> >& >(m_nodes).swap(sortedNodes); |
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170 |
} |
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|
171 |
|
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172 |
void NodeSet::reverse() |
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173 |
{ |
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174 |
if (m_nodes.isEmpty()) |
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175 |
return; |
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|
176 |
|
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177 |
unsigned from = 0; |
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178 |
unsigned to = m_nodes.size() - 1; |
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179 |
while (from < to) { |
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180 |
m_nodes[from].swap(m_nodes[to]); |
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|
181 |
++from; |
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182 |
--to; |
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183 |
} |
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184 |
} |
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|
185 |
|
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186 |
Node* NodeSet::firstNode() const |
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187 |
{ |
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188 |
if (isEmpty()) |
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189 |
return 0; |
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|
190 |
|
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191 |
sort(); // FIXME: fully sorting the node-set just to find its first node is wasteful. |
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192 |
return m_nodes.at(0).get(); |
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193 |
} |
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|
194 |
|
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195 |
Node* NodeSet::anyNode() const |
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196 |
{ |
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197 |
if (isEmpty()) |
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198 |
return 0; |
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|
199 |
|
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200 |
return m_nodes.at(0).get(); |
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201 |
} |
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202 |
|
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203 |
} |
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204 |
} |
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205 |
|
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206 |
#endif // ENABLE(XPATH) |