blob: 2467d0c4bc114cc0190f627c1fbf4195f459e4dd [file] [log] [blame]
/*
* CSS Media Query
*
* Copyright (C) 2005, 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "core/css/MediaQuery.h"
#include <memory>
#include "core/css/MediaQueryExp.h"
#include "core/html/parser/HTMLParserIdioms.h"
#include "core/media_type_names.h"
#include "platform/wtf/NonCopyingSort.h"
#include "platform/wtf/text/StringBuilder.h"
namespace blink {
// http://dev.w3.org/csswg/cssom/#serialize-a-media-query
String MediaQuery::Serialize() const {
StringBuilder result;
switch (restrictor_) {
case MediaQuery::kOnly:
result.Append("only ");
break;
case MediaQuery::kNot:
result.Append("not ");
break;
case MediaQuery::kNone:
break;
}
if (expressions_.IsEmpty()) {
result.Append(media_type_);
return result.ToString();
}
if (media_type_ != MediaTypeNames::all || restrictor_ != kNone) {
result.Append(media_type_);
result.Append(" and ");
}
result.Append(expressions_.at(0).Serialize());
for (size_t i = 1; i < expressions_.size(); ++i) {
result.Append(" and ");
result.Append(expressions_.at(i).Serialize());
}
return result.ToString();
}
static bool ExpressionCompare(const MediaQueryExp& a, const MediaQueryExp& b) {
return CodePointCompare(a.Serialize(), b.Serialize()) < 0;
}
std::unique_ptr<MediaQuery> MediaQuery::CreateNotAll() {
return std::make_unique<MediaQuery>(MediaQuery::kNot, MediaTypeNames::all,
ExpressionHeapVector());
}
std::unique_ptr<MediaQuery> MediaQuery::Create(
RestrictorType restrictor,
String media_type,
ExpressionHeapVector expressions) {
return std::make_unique<MediaQuery>(restrictor, std::move(media_type),
std::move(expressions));
}
MediaQuery::MediaQuery(RestrictorType restrictor,
String media_type,
ExpressionHeapVector expressions)
: restrictor_(restrictor),
media_type_(AttemptStaticStringCreation(media_type.LowerASCII())),
expressions_(std::move(expressions)) {
NonCopyingSort(expressions_.begin(), expressions_.end(), ExpressionCompare);
// Remove all duplicated expressions.
MediaQueryExp key = MediaQueryExp::Invalid();
for (int i = expressions_.size() - 1; i >= 0; --i) {
MediaQueryExp exp = expressions_.at(i);
CHECK(exp.IsValid());
if (exp == key)
expressions_.EraseAt(i);
else
key = exp;
}
}
MediaQuery::MediaQuery(const MediaQuery& o)
: restrictor_(o.restrictor_),
media_type_(o.media_type_),
serialization_cache_(o.serialization_cache_) {
expressions_.ReserveInitialCapacity(o.expressions_.size());
for (unsigned i = 0; i < o.expressions_.size(); ++i)
expressions_.push_back(o.expressions_[i]);
}
MediaQuery::~MediaQuery() = default;
// http://dev.w3.org/csswg/cssom/#compare-media-queries
bool MediaQuery::operator==(const MediaQuery& other) const {
return CssText() == other.CssText();
}
// http://dev.w3.org/csswg/cssom/#serialize-a-list-of-media-queries
String MediaQuery::CssText() const {
if (serialization_cache_.IsNull())
const_cast<MediaQuery*>(this)->serialization_cache_ = Serialize();
return serialization_cache_;
}
} // namespace blink