2 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2004, 2006, 2010, 2012 Apple Inc. All rights reserved.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
21 #include "core/css/MediaList.h"
23 #include "bindings/core/v8/ExceptionState.h"
24 #include "core/MediaFeatureNames.h"
25 #include "core/css/parser/BisonCSSParser.h"
26 #include "core/css/CSSStyleSheet.h"
27 #include "core/css/MediaQuery.h"
28 #include "core/css/MediaQueryExp.h"
29 #include "core/css/parser/MediaQueryParser.h"
30 #include "core/dom/Document.h"
31 #include "core/frame/LocalDOMWindow.h"
32 #include "core/inspector/ConsoleMessage.h"
33 #include "wtf/text/StringBuilder.h"
37 /* MediaList is used to store 3 types of media related entities which mean the same:
39 * Media Queries, Media Types and Media Descriptors.
41 * Media queries, as described in the Media Queries Level 3 specification, build on
42 * the mechanism outlined in HTML4. The syntax of media queries fit into the media
43 * type syntax reserved in HTML4. The media attribute of HTML4 also exists in XHTML
44 * and generic XML. The same syntax can also be used inside the @media and @import
47 * However, the parsing rules for media queries are incompatible with those of HTML4
48 * and are consistent with those of media queries used in CSS.
50 * HTML5 (at the moment of writing still work in progress) references the Media Queries
51 * specification directly and thus updates the rules for HTML.
53 * CSS 2.1 Spec (http://www.w3.org/TR/CSS21/media.html)
54 * CSS 3 Media Queries Spec (http://www.w3.org/TR/css3-mediaqueries/)
57 MediaQuerySet::MediaQuerySet()
61 MediaQuerySet::MediaQuerySet(const MediaQuerySet& o)
62 : m_queries(o.m_queries.size())
64 for (unsigned i = 0; i < m_queries.size(); ++i)
65 m_queries[i] = o.m_queries[i]->copy();
68 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MediaQuerySet)
70 PassRefPtrWillBeRawPtr<MediaQuerySet> MediaQuerySet::create(const String& mediaString)
72 if (mediaString.isEmpty())
73 return MediaQuerySet::create();
75 if (RuntimeEnabledFeatures::mediaQueryParserEnabled())
76 return MediaQueryParser::parseMediaQuerySet(mediaString);
78 BisonCSSParser parser(strictCSSParserContext());
79 return parser.parseMediaQueryList(mediaString);
82 PassRefPtrWillBeRawPtr<MediaQuerySet> MediaQuerySet::createOffMainThread(const String& mediaString)
84 if (mediaString.isEmpty())
85 return MediaQuerySet::create();
87 return MediaQueryParser::parseMediaQuerySet(mediaString);
90 bool MediaQuerySet::set(const String& mediaString)
92 RefPtrWillBeRawPtr<MediaQuerySet> result = create(mediaString);
93 m_queries.swap(result->m_queries);
97 bool MediaQuerySet::add(const String& queryString)
99 // To "parse a media query" for a given string means to follow "the parse
100 // a media query list" steps and return "null" if more than one media query
101 // is returned, or else the returned media query.
102 RefPtrWillBeRawPtr<MediaQuerySet> result = create(queryString);
104 // Only continue if exactly one media query is found, as described above.
105 if (result->m_queries.size() != 1)
108 OwnPtrWillBeRawPtr<MediaQuery> newQuery = result->m_queries[0].release();
111 // If comparing with any of the media queries in the collection of media
112 // queries returns true terminate these steps.
113 for (size_t i = 0; i < m_queries.size(); ++i) {
114 MediaQuery* query = m_queries[i].get();
115 if (*query == *newQuery)
119 m_queries.append(newQuery.release());
123 bool MediaQuerySet::remove(const String& queryStringToRemove)
125 // To "parse a media query" for a given string means to follow "the parse
126 // a media query list" steps and return "null" if more than one media query
127 // is returned, or else the returned media query.
128 RefPtrWillBeRawPtr<MediaQuerySet> result = create(queryStringToRemove);
130 // Only continue if exactly one media query is found, as described above.
131 if (result->m_queries.size() != 1)
134 OwnPtrWillBeRawPtr<MediaQuery> newQuery = result->m_queries[0].release();
137 // Remove any media query from the collection of media queries for which
138 // comparing with the media query returns true.
140 for (size_t i = 0; i < m_queries.size(); ++i) {
141 MediaQuery* query = m_queries[i].get();
142 if (*query == *newQuery) {
152 void MediaQuerySet::addMediaQuery(PassOwnPtrWillBeRawPtr<MediaQuery> mediaQuery)
154 m_queries.append(mediaQuery);
157 String MediaQuerySet::mediaText() const
162 for (size_t i = 0; i < m_queries.size(); ++i) {
164 text.appendLiteral(", ");
167 text.append(m_queries[i]->cssText());
169 return text.toString();
172 void MediaQuerySet::trace(Visitor* visitor)
174 // We don't support tracing of vectors of OwnPtrs (ie. OwnPtr<Vector<OwnPtr<MediaQuery> > >).
175 // Since this is a transitional object we are just ifdef'ing it out when oilpan is not enabled.
177 visitor->trace(m_queries);
181 MediaList::MediaList(MediaQuerySet* mediaQueries, CSSStyleSheet* parentSheet)
182 : m_mediaQueries(mediaQueries)
183 , m_parentStyleSheet(parentSheet)
184 , m_parentRule(nullptr)
186 ScriptWrappable::init(this);
189 MediaList::MediaList(MediaQuerySet* mediaQueries, CSSRule* parentRule)
190 : m_mediaQueries(mediaQueries)
191 , m_parentStyleSheet(nullptr)
192 , m_parentRule(parentRule)
194 ScriptWrappable::init(this);
197 MediaList::~MediaList()
201 void MediaList::setMediaText(const String& value)
203 CSSStyleSheet::RuleMutationScope mutationScope(m_parentRule);
205 m_mediaQueries->set(value);
207 if (m_parentStyleSheet)
208 m_parentStyleSheet->didMutate();
211 String MediaList::item(unsigned index) const
213 const WillBeHeapVector<OwnPtrWillBeMember<MediaQuery> >& queries = m_mediaQueries->queryVector();
214 if (index < queries.size())
215 return queries[index]->cssText();
219 void MediaList::deleteMedium(const String& medium, ExceptionState& exceptionState)
221 CSSStyleSheet::RuleMutationScope mutationScope(m_parentRule);
223 bool success = m_mediaQueries->remove(medium);
225 exceptionState.throwDOMException(NotFoundError, "Failed to delete '" + medium + "'.");
228 if (m_parentStyleSheet)
229 m_parentStyleSheet->didMutate();
232 void MediaList::appendMedium(const String& medium, ExceptionState& exceptionState)
234 CSSStyleSheet::RuleMutationScope mutationScope(m_parentRule);
236 bool success = m_mediaQueries->add(medium);
238 exceptionState.throwDOMException(InvalidCharacterError, "The value provided ('" + medium + "') is not a valid medium.");
242 if (m_parentStyleSheet)
243 m_parentStyleSheet->didMutate();
246 void MediaList::reattach(MediaQuerySet* mediaQueries)
248 ASSERT(mediaQueries);
249 m_mediaQueries = mediaQueries;
252 void MediaList::trace(Visitor* visitor)
254 visitor->trace(m_mediaQueries);
255 visitor->trace(m_parentStyleSheet);
256 visitor->trace(m_parentRule);
259 static void addResolutionWarningMessageToConsole(Document* document, const String& serializedExpression, CSSPrimitiveValue::UnitType type)
263 DEFINE_STATIC_LOCAL(String, mediaQueryMessage, ("Consider using 'dppx' units, as in CSS '%replacementUnits%' means dots-per-CSS-%lengthUnit%, not dots-per-physical-%lengthUnit%, so does not correspond to the actual '%replacementUnits%' of a screen. In media query expression: "));
264 DEFINE_STATIC_LOCAL(String, mediaValueDPI, ("dpi"));
265 DEFINE_STATIC_LOCAL(String, mediaValueDPCM, ("dpcm"));
266 DEFINE_STATIC_LOCAL(String, lengthUnitInch, ("inch"));
267 DEFINE_STATIC_LOCAL(String, lengthUnitCentimeter, ("centimeter"));
269 StringBuilder message;
270 if (CSSPrimitiveValue::isDotsPerInch(type))
271 message.append(String(mediaQueryMessage).replace("%replacementUnits%", mediaValueDPI).replace("%lengthUnit%", lengthUnitInch));
272 else if (CSSPrimitiveValue::isDotsPerCentimeter(type))
273 message.append(String(mediaQueryMessage).replace("%replacementUnits%", mediaValueDPCM).replace("%lengthUnit%", lengthUnitCentimeter));
275 ASSERT_NOT_REACHED();
277 message.append(serializedExpression);
279 document->addConsoleMessage(ConsoleMessage::create(CSSMessageSource, DebugMessageLevel, message.toString()));
282 static inline bool isResolutionMediaFeature(const String& mediaFeature)
284 return mediaFeature == MediaFeatureNames::resolutionMediaFeature
285 || mediaFeature == MediaFeatureNames::maxResolutionMediaFeature
286 || mediaFeature == MediaFeatureNames::minResolutionMediaFeature;
289 void reportMediaQueryWarningIfNeeded(Document* document, const MediaQuerySet* mediaQuerySet)
291 if (!mediaQuerySet || !document)
294 const WillBeHeapVector<OwnPtrWillBeMember<MediaQuery> >& mediaQueries = mediaQuerySet->queryVector();
295 const size_t queryCount = mediaQueries.size();
300 CSSPrimitiveValue::UnitType suspiciousType = CSSPrimitiveValue::CSS_UNKNOWN;
301 bool dotsPerPixelUsed = false;
302 for (size_t i = 0; i < queryCount; ++i) {
303 const MediaQuery* query = mediaQueries[i].get();
304 if (equalIgnoringCase(query->mediaType(), "print"))
307 const ExpressionHeapVector& expressions = query->expressions();
308 for (size_t j = 0; j < expressions.size(); ++j) {
309 const MediaQueryExp* expression = expressions.at(j).get();
310 if (isResolutionMediaFeature(expression->mediaFeature())) {
311 MediaQueryExpValue expValue = expression->expValue();
312 if (expValue.isValue) {
313 if (CSSPrimitiveValue::isDotsPerPixel(expValue.unit))
314 dotsPerPixelUsed = true;
315 else if (CSSPrimitiveValue::isDotsPerInch(expValue.unit) || CSSPrimitiveValue::isDotsPerCentimeter(expValue.unit))
316 suspiciousType = expValue.unit;
322 if (suspiciousType && !dotsPerPixelUsed)
323 addResolutionWarningMessageToConsole(document, mediaQuerySet->mediaText(), suspiciousType);