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// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "cobalt/cssom/media_list.h"
#include <limits>
#include "base/logging.h"
#include "cobalt/cssom/css_parser.h"
#include "cobalt/cssom/length_value.h"
#include "cobalt/cssom/media_query.h"
#include "cobalt/cssom/property_value.h"
#include "cobalt/cssom/viewport_size.h"
namespace cobalt {
namespace cssom {
MediaList::MediaList() : css_parser_(NULL) {}
MediaList::MediaList(CSSParser* css_parser) : css_parser_(css_parser) {}
std::string MediaList::media_text() const {
std::string media;
size_t mediaitem = 0;
while (true) {
media += media_queries_[mediaitem]->media_query();
if (++mediaitem < media_queries_.size())
media += ", ";
else
break;
}
return media;
}
void MediaList::set_media_text(const std::string& css_text) {
DCHECK(css_parser_);
scoped_refptr<MediaList> media_list =
css_parser_->ParseMediaList(css_text, GetInlineSourceLocation());
media_queries_.swap(media_list->media_queries_);
}
// Returns the number of MediaQuery objects represented by the collection.
unsigned int MediaList::length() const {
CHECK_LE(media_queries_.size(), std::numeric_limits<unsigned int>::max());
return static_cast<unsigned int>(media_queries_.size());
}
std::string MediaList::Item(unsigned int index) const {
return index < media_queries_.size() ? media_queries_[index]->media_query()
: "";
}
// Inserts a new media query string into the current style sheet. This Web API
// takes a string as input and parses it into a MediaQuery.
void MediaList::AppendMedium(const std::string& medium) {
DCHECK(css_parser_);
scoped_refptr<MediaQuery> media_query =
css_parser_->ParseMediaQuery(medium, GetInlineSourceLocation());
// TODO: Don't add the query if the same one already exists in the
// collection. See https://www.w3.org/TR/cssom/#medialist for details.
media_queries_.push_back(media_query);
}
void MediaList::Append(const scoped_refptr<MediaQuery>& media_query) {
media_queries_.push_back(media_query);
}
bool MediaList::EvaluateConditionValue(const ViewportSize& viewport_size) {
if (media_queries_.empty()) {
// A CSSMediaRule with no expressions always evaluates to true.
return true;
}
for (MediaQueries::iterator it = media_queries_.begin();
it != media_queries_.end(); ++it) {
if ((*it)->EvaluateConditionValue(viewport_size)) {
return true;
}
}
return false;
}
void MediaList::TraceMembers(script::Tracer* tracer) {
tracer->TraceItems(media_queries_);
}
MediaList::~MediaList() {}
} // namespace cssom
} // namespace cobalt