author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 11 Jun 2010 14:42:15 +0300 | |
changeset 74 | 91031d3aab7d |
parent 68 | 92a765b5b3e7 |
child 94 | 919f36ff910f |
permissions | -rw-r--r-- |
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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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* (C) 1999-2003 Lars Knoll (knoll@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 "MediaList.h" |
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#include "cssparser.h" |
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#include "CSSRule.h" |
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#include "CSSStyleSheet.h" |
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#include "ExceptionCode.h" |
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#include "MediaQuery.h" |
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namespace WebCore { |
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|
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/* MediaList is used to store 3 types of media related entities which mean the same: |
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* Media Queries, Media Types and Media Descriptors. |
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* Currently MediaList always tries to parse media queries and if parsing fails, |
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* tries to fallback to Media Descriptors if m_fallback flag is set. |
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* Slight problem with syntax error handling: |
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* CSS 2.1 Spec (http://www.w3.org/TR/CSS21/media.html) |
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* specifies that failing media type parsing is a syntax error |
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* CSS 3 Media Queries Spec (http://www.w3.org/TR/css3-mediaqueries/) |
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* specifies that failing media query is a syntax error |
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* HTML 4.01 spec (http://www.w3.org/TR/REC-html40/present/styles.html#adef-media) |
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* specifies that Media Descriptors should be parsed with forward-compatible syntax |
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* DOM Level 2 Style Sheet spec (http://www.w3.org/TR/DOM-Level-2-Style/) |
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* talks about MediaList.mediaText and refers |
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* - to Media Descriptors of HTML 4.0 in context of StyleSheet |
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* - to Media Types of CSS 2.0 in context of CSSMediaRule and CSSImportRule |
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* |
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* These facts create situation where same (illegal) media specification may result in |
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* different parses depending on whether it is media attr of style element or part of |
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* css @media rule. |
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* <style media="screen and resolution > 40dpi"> ..</style> will be enabled on screen devices where as |
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* @media screen and resolution > 40dpi {..} will not. |
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* This gets more counter-intuitive in JavaScript: |
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* document.styleSheets[0].media.mediaText = "screen and resolution > 40dpi" will be ok and |
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* enabled, while |
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* document.styleSheets[0].cssRules[0].media.mediaText = "screen and resolution > 40dpi" will |
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* throw SYNTAX_ERR exception. |
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*/ |
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MediaList::MediaList(CSSStyleSheet* parentSheet, bool fallbackToDescriptor) |
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: StyleBase(parentSheet) |
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, m_fallback(fallbackToDescriptor) |
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{ |
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} |
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MediaList::MediaList(CSSStyleSheet* parentSheet, const String& media, bool fallbackToDescriptor) |
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: StyleBase(parentSheet) |
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, m_fallback(fallbackToDescriptor) |
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{ |
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ExceptionCode ec = 0; |
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setMediaText(media, ec); |
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// FIXME: parsing can fail. The problem with failing constructor is that |
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// we would need additional flag saying MediaList is not valid |
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// Parse can fail only when fallbackToDescriptor == false, i.e when HTML4 media descriptor |
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// forward-compatible syntax is not in use. |
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// DOMImplementationCSS seems to mandate that media descriptors are used |
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// for both html and svg, even though svg:style doesn't use media descriptors |
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// Currently the only places where parsing can fail are |
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// creating <svg:style>, creating css media / import rules from js |
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if (ec) |
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setMediaText("invalid", ec); |
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} |
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MediaList::MediaList(CSSRule* parentRule, const String& media, bool fallbackToDescriptor) |
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: StyleBase(parentRule) |
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, m_fallback(fallbackToDescriptor) |
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{ |
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ExceptionCode ec = 0; |
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setMediaText(media, ec); |
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//FIXME: parsing can fail. |
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if (ec) |
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setMediaText("invalid", ec); |
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} |
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MediaList::~MediaList() |
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{ |
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deleteAllValues(m_queries); |
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} |
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CSSStyleSheet *MediaList::parentStyleSheet() const |
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{ |
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return parent()->isCSSStyleSheet() ? static_cast<CSSStyleSheet*>(parent()) : 0; |
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} |
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|
105 |
|
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106 |
CSSRule *MediaList::parentRule() const |
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107 |
{ |
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return parent()->isRule() ? static_cast<CSSRule*>(parent()) : 0; |
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109 |
} |
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110 |
|
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111 |
static String parseMediaDescriptor(const String& s) |
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112 |
{ |
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int len = s.length(); |
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114 |
|
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// http://www.w3.org/TR/REC-html40/types.html#type-media-descriptors |
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// "Each entry is truncated just before the first character that isn't a |
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// US ASCII letter [a-zA-Z] (ISO 10646 hex 41-5a, 61-7a), digit [0-9] (hex 30-39), |
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// or hyphen (hex 2d)." |
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119 |
int i; |
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unsigned short c; |
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for (i = 0; i < len; ++i) { |
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c = s[i]; |
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if (! ((c >= 'a' && c <= 'z') |
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|| (c >= 'A' && c <= 'Z') |
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|| (c >= '1' && c <= '9') |
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|| (c == '-'))) |
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break; |
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128 |
} |
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return s.left(i); |
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130 |
} |
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131 |
|
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132 |
void MediaList::deleteMedium(const String& oldMedium, ExceptionCode& ec) |
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133 |
{ |
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MediaList tempMediaList; |
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CSSParser p(true); |
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136 |
|
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MediaQuery* oldQuery = 0; |
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bool deleteOldQuery = false; |
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139 |
|
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if (p.parseMediaQuery(&tempMediaList, oldMedium)) { |
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141 |
if (tempMediaList.m_queries.size() > 0) |
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oldQuery = tempMediaList.m_queries[0]; |
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143 |
} else if (m_fallback) { |
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144 |
String medium = parseMediaDescriptor(oldMedium); |
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145 |
if (!medium.isNull()) { |
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oldQuery = new MediaQuery(MediaQuery::None, medium, 0); |
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deleteOldQuery = true; |
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148 |
} |
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149 |
} |
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150 |
|
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151 |
// DOM Style Sheets spec doesn't allow SYNTAX_ERR to be thrown in deleteMedium |
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152 |
ec = NOT_FOUND_ERR; |
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153 |
|
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154 |
if (oldQuery) { |
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155 |
for(size_t i = 0; i < m_queries.size(); ++i) { |
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156 |
MediaQuery* a = m_queries[i]; |
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157 |
if (*a == *oldQuery) { |
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158 |
m_queries.remove(i); |
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159 |
delete a; |
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160 |
ec = 0; |
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161 |
break; |
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162 |
} |
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163 |
} |
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164 |
if (deleteOldQuery) |
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165 |
delete oldQuery; |
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166 |
} |
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167 |
} |
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|
168 |
|
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169 |
String MediaList::mediaText() const |
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170 |
{ |
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171 |
String text(""); |
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172 |
|
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173 |
bool first = true; |
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174 |
for (size_t i = 0; i < m_queries.size(); ++i) { |
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175 |
if (!first) |
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176 |
text += ", "; |
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177 |
else |
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178 |
first = false; |
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179 |
text += m_queries[i]->cssText(); |
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180 |
} |
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181 |
|
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182 |
return text; |
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183 |
} |
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|
184 |
|
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185 |
void MediaList::setMediaText(const String& value, ExceptionCode& ec) |
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186 |
{ |
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187 |
MediaList tempMediaList; |
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188 |
CSSParser p(true); |
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|
189 |
|
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190 |
Vector<String> list = value.split(','); |
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191 |
Vector<String>::const_iterator end = list.end(); |
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192 |
for (Vector<String>::const_iterator it = list.begin(); it != end; ++it) { |
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193 |
String medium = (*it).stripWhiteSpace(); |
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194 |
if (!medium.isEmpty()) { |
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195 |
if (!p.parseMediaQuery(&tempMediaList, medium)) { |
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196 |
if (m_fallback) { |
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197 |
String mediaDescriptor = parseMediaDescriptor(medium); |
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198 |
if (!mediaDescriptor.isNull()) |
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199 |
tempMediaList.m_queries.append(new MediaQuery(MediaQuery::None, mediaDescriptor, 0)); |
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|
200 |
} else { |
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|
201 |
ec = SYNTAX_ERR; |
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202 |
return; |
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|
203 |
} |
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204 |
} |
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205 |
} else if (!m_fallback) { |
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206 |
ec = SYNTAX_ERR; |
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207 |
return; |
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208 |
} |
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209 |
} |
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210 |
// ",,,," falls straight through, but is not valid unless fallback |
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|
211 |
if (!m_fallback && list.begin() == list.end()) { |
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|
212 |
String s = value.stripWhiteSpace(); |
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213 |
if (!s.isEmpty()) { |
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|
214 |
ec = SYNTAX_ERR; |
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return; |
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} |
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} |
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|
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ec = 0; |
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deleteAllValues(m_queries); |
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m_queries = tempMediaList.m_queries; |
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tempMediaList.m_queries.clear(); |
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} |
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|
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String MediaList::item(unsigned index) const |
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{ |
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if (index < m_queries.size()) { |
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MediaQuery* query = m_queries[index]; |
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return query->cssText(); |
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} |
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|
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return String(); |
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} |
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|
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void MediaList::appendMedium(const String& newMedium, ExceptionCode& ec) |
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{ |
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ec = INVALID_CHARACTER_ERR; |
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CSSParser p(true); |
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if (p.parseMediaQuery(this, newMedium)) { |
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ec = 0; |
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} else if (m_fallback) { |
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String medium = parseMediaDescriptor(newMedium); |
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if (!medium.isNull()) { |
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m_queries.append(new MediaQuery(MediaQuery::None, medium, 0)); |
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ec = 0; |
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} |
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} |
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} |
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|
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void MediaList::appendMediaQuery(MediaQuery* mediaQuery) |
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{ |
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m_queries.append(mediaQuery); |
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} |
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|
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} |