author | Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com> |
Fri, 08 May 2009 08:25:06 +0300 | |
changeset 8 | 7c90e6132015 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/** |
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* This file is part of the DOM implementation for KDE. |
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* |
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* Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
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* (C) 1999 Antti Koivisto (koivisto@kde.org) |
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* (C) 2001 Dirk Mueller (mueller@kde.org) |
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* Copyright (C) 2004, 2006 Apple Computer, Inc. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Library General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Library General Public License for more details. |
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* |
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* You should have received a copy of the GNU Library General Public License |
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* along with this library; see the file COPYING.LIB. If not, write to |
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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* Boston, MA 02110-1301, USA. |
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*/ |
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#include "config.h" |
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#include "NodeList.h" |
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#include "Document.h" |
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#include "Element.h" |
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namespace WebCore { |
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NodeList::NodeList(PassRefPtr<Node> rootNode) |
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: m_rootNode(rootNode) |
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, m_caches(new Caches) |
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, m_ownsCaches(true) |
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{ |
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m_rootNode->registerNodeList(this); |
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} |
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|
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NodeList::NodeList(PassRefPtr<Node> rootNode, NodeList::Caches* info) |
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: m_rootNode(rootNode) |
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, m_caches(info) |
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, m_ownsCaches(false) |
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{ |
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m_rootNode->registerNodeList(this); |
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} |
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NodeList::~NodeList() |
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{ |
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m_rootNode->unregisterNodeList(this); |
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if (m_ownsCaches) |
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delete m_caches; |
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} |
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unsigned NodeList::recursiveLength(Node* start) const |
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{ |
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if (!start) |
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start = m_rootNode.get(); |
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|
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if (m_caches->isLengthCacheValid && start == m_rootNode) |
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return m_caches->cachedLength; |
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|
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unsigned len = 0; |
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for (Node* n = start->firstChild(); n; n = n->nextSibling()) |
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if (n->isElementNode()) { |
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if (nodeMatches(n)) |
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len++; |
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len += recursiveLength(n); |
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} |
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|
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if (start == m_rootNode) { |
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m_caches->cachedLength = len; |
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m_caches->isLengthCacheValid = true; |
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} |
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return len; |
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} |
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|
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Node* NodeList::itemForwardsFromCurrent(Node* start, unsigned offset, int remainingOffset) const |
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{ |
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ASSERT(remainingOffset >= 0); |
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|
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for (Node *n = start; n; n = n->traverseNextNode(m_rootNode.get())) { |
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if (n->isElementNode()) { |
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if (nodeMatches(n)) { |
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if (!remainingOffset) { |
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m_caches->lastItem = n; |
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m_caches->lastItemOffset = offset; |
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m_caches->isItemCacheValid = true; |
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return n; |
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} |
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remainingOffset--; |
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} |
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} |
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} |
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return 0; // no matching node in this subtree |
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} |
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|
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Node* NodeList::itemBackwardsFromCurrent(Node* start, unsigned offset, int remainingOffset) const |
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{ |
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ASSERT(remainingOffset < 0); |
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for (Node *n = start; n; n = n->traversePreviousNode(m_rootNode.get())) { |
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if (n->isElementNode()) { |
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if (nodeMatches(n)) { |
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if (!remainingOffset) { |
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109 |
m_caches->lastItem = n; |
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110 |
m_caches->lastItemOffset = offset; |
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|
111 |
m_caches->isItemCacheValid = true; |
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112 |
return n; |
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113 |
} |
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114 |
remainingOffset++; |
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115 |
} |
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116 |
} |
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117 |
} |
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118 |
|
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119 |
return 0; // no matching node in this subtree |
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120 |
} |
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121 |
|
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122 |
Node* NodeList::recursiveItem(unsigned offset, Node* start) const |
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123 |
{ |
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124 |
int remainingOffset = offset; |
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125 |
if (!start) { |
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126 |
start = m_rootNode->firstChild(); |
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127 |
if (m_caches->isItemCacheValid) { |
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128 |
if (offset == m_caches->lastItemOffset) { |
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129 |
return m_caches->lastItem; |
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130 |
} else if (offset > m_caches->lastItemOffset || m_caches->lastItemOffset - offset < offset) { |
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131 |
start = m_caches->lastItem; |
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132 |
remainingOffset -= m_caches->lastItemOffset; |
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133 |
} |
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134 |
} |
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135 |
} |
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136 |
|
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137 |
if (remainingOffset < 0) |
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138 |
return itemBackwardsFromCurrent(start, offset, remainingOffset); |
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139 |
else |
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140 |
return itemForwardsFromCurrent(start, offset, remainingOffset); |
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141 |
} |
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142 |
|
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143 |
Node* NodeList::itemWithName(const AtomicString& elementId) const |
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144 |
{ |
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145 |
if (m_rootNode->isDocumentNode() || m_rootNode->inDocument()) { |
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146 |
Node* node = m_rootNode->document()->getElementById(elementId); |
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147 |
|
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148 |
if (!node || !nodeMatches(node)) |
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149 |
return 0; |
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150 |
|
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151 |
for (Node* p = node->parentNode(); p; p = p->parentNode()) |
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152 |
if (p == m_rootNode) |
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153 |
return node; |
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154 |
|
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155 |
return 0; |
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156 |
} |
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|
157 |
|
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158 |
unsigned l = length(); |
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159 |
for (unsigned i = 0; i < l; i++) { |
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160 |
Node* node = item(i); |
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161 |
if (node->isElementNode() && static_cast<Element*>(node)->getIDAttribute() == elementId) |
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|
162 |
return node; |
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|
163 |
} |
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|
164 |
|
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|
165 |
return 0; |
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|
166 |
} |
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|
167 |
|
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|
168 |
void NodeList::rootNodeChildrenChanged() |
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|
169 |
{ |
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|
170 |
m_caches->reset(); |
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|
171 |
} |
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|
172 |
|
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|
173 |
|
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|
174 |
NodeList::Caches::Caches() |
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|
175 |
: lastItem(0) |
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|
176 |
, isLengthCacheValid(false) |
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|
177 |
, isItemCacheValid(false) |
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|
178 |
{ |
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|
179 |
} |
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|
180 |
|
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|
181 |
void NodeList::Caches::reset() |
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|
182 |
{ |
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|
183 |
lastItem = 0; |
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|
184 |
isLengthCacheValid = false; |
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|
185 |
isItemCacheValid = false; |
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|
186 |
} |
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|
187 |
|
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|
188 |
} |