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/*
* (C) 1999-2003 Lars Knoll (knoll@kde.org)
* Copyright (C) 2004, 2006, 2010, 2012 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "third_party/blink/renderer/core/css/media_list.h"
#include <memory>
#include "third_party/blink/renderer/core/css/css_style_sheet.h"
#include "third_party/blink/renderer/core/css/media_query_exp.h"
#include "third_party/blink/renderer/core/css/parser/media_query_parser.h"
#include "third_party/blink/renderer/platform/bindings/exception_state.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
namespace blink {
/* MediaList is used to store 3 types of media related entities which mean the
* same:
*
* Media Queries, Media Types and Media Descriptors.
*
* Media queries, as described in the Media Queries Level 3 specification, build
* on the mechanism outlined in HTML4. The syntax of media queries fit into the
* media type syntax reserved in HTML4. The media attribute of HTML4 also exists
* in XHTML and generic XML. The same syntax can also be used inside the @media
* and @import rules of CSS.
*
* However, the parsing rules for media queries are incompatible with those of
* HTML4 and are consistent with those of media queries used in CSS.
*
* HTML5 (at the moment of writing still work in progress) references the Media
* Queries specification directly and thus updates the rules for HTML.
*
* CSS 2.1 Spec (http://www.w3.org/TR/CSS21/media.html)
* CSS 3 Media Queries Spec (http://www.w3.org/TR/css3-mediaqueries/)
*/
MediaQuerySet::MediaQuerySet() = default;
MediaQuerySet::MediaQuerySet(const MediaQuerySet& o)
: queries_(o.queries_.size()) {
for (unsigned i = 0; i < queries_.size(); ++i)
queries_[i] = o.queries_[i]->Copy();
}
scoped_refptr<MediaQuerySet> MediaQuerySet::Create(
const String& media_string,
const ExecutionContext* execution_context) {
if (media_string.IsEmpty())
return MediaQuerySet::Create();
return MediaQueryParser::ParseMediaQuerySet(media_string, execution_context);
}
bool MediaQuerySet::Set(const String& media_string,
const ExecutionContext* execution_context) {
scoped_refptr<MediaQuerySet> result = Create(media_string, execution_context);
// TODO(keishi) Changed DCHECK to CHECK for crbug.com/699269 diagnosis
for (const auto& query : result->queries_) {
CHECK(query);
}
queries_.swap(result->queries_);
return true;
}
bool MediaQuerySet::Add(const String& query_string,
const ExecutionContext* execution_context) {
// To "parse a media query" for a given string means to follow "the parse
// a media query list" steps and return "null" if more than one media query
// is returned, or else the returned media query.
scoped_refptr<MediaQuerySet> result = Create(query_string, execution_context);
// Only continue if exactly one media query is found, as described above.
if (result->queries_.size() != 1)
return false;
std::unique_ptr<MediaQuery> new_query = std::move(result->queries_[0]);
// TODO(keishi) Changed DCHECK to CHECK for crbug.com/699269 diagnosis
CHECK(new_query);
// If comparing with any of the media queries in the collection of media
// queries returns true terminate these steps.
for (wtf_size_t i = 0; i < queries_.size(); ++i) {
MediaQuery& query = *queries_[i];
if (query == *new_query)
return false;
}
queries_.push_back(std::move(new_query));
return true;
}
bool MediaQuerySet::Remove(const String& query_string_to_remove,
const ExecutionContext* execution_context) {
// To "parse a media query" for a given string means to follow "the parse
// a media query list" steps and return "null" if more than one media query
// is returned, or else the returned media query.
scoped_refptr<MediaQuerySet> result =
Create(query_string_to_remove, execution_context);
// Only continue if exactly one media query is found, as described above.
if (result->queries_.size() != 1)
return true;
std::unique_ptr<MediaQuery> new_query = std::move(result->queries_[0]);
// TODO(keishi) Changed DCHECK to CHECK for crbug.com/699269 diagnosis
CHECK(new_query);
// Remove any media query from the collection of media queries for which
// comparing with the media query returns true.
bool found = false;
for (wtf_size_t i = 0; i < queries_.size(); ++i) {
MediaQuery& query = *queries_[i];
if (query == *new_query) {
queries_.EraseAt(i);
--i;
found = true;
}
}
return found;
}
void MediaQuerySet::AddMediaQuery(std::unique_ptr<MediaQuery> media_query) {
// TODO(keishi) Changed DCHECK to CHECK for crbug.com/699269 diagnosis
CHECK(media_query);
queries_.push_back(std::move(media_query));
}
String MediaQuerySet::MediaText() const {
StringBuilder text;
bool first = true;
for (wtf_size_t i = 0; i < queries_.size(); ++i) {
if (!first)
text.Append(", ");
else
first = false;
text.Append(queries_[i]->CssText());
}
return text.ToString();
}
MediaList::MediaList(scoped_refptr<MediaQuerySet> media_queries,
CSSStyleSheet* parent_sheet)
: media_queries_(media_queries),
parent_style_sheet_(parent_sheet),
parent_rule_(nullptr) {}
MediaList::MediaList(scoped_refptr<MediaQuerySet> media_queries,
CSSRule* parent_rule)
: media_queries_(media_queries),
parent_style_sheet_(nullptr),
parent_rule_(parent_rule) {}
void MediaList::setMediaText(const ExecutionContext* execution_context,
const String& value) {
CSSStyleSheet::RuleMutationScope mutation_scope(parent_rule_);
media_queries_->Set(value, execution_context);
if (parent_style_sheet_)
parent_style_sheet_->DidMutate();
}
String MediaList::item(unsigned index) const {
const Vector<std::unique_ptr<MediaQuery>>& queries =
media_queries_->QueryVector();
if (index < queries.size())
return queries[index]->CssText();
return String();
}
void MediaList::deleteMedium(const ExecutionContext* execution_context,
const String& medium,
ExceptionState& exception_state) {
CSSStyleSheet::RuleMutationScope mutation_scope(parent_rule_);
bool success = media_queries_->Remove(medium, execution_context);
if (!success) {
exception_state.ThrowDOMException(DOMExceptionCode::kNotFoundError,
"Failed to delete '" + medium + "'.");
return;
}
if (parent_style_sheet_)
parent_style_sheet_->DidMutate();
}
void MediaList::appendMedium(const ExecutionContext* execution_context,
const String& medium) {
CSSStyleSheet::RuleMutationScope mutation_scope(parent_rule_);
bool added = media_queries_->Add(medium, execution_context);
if (!added)
return;
if (parent_style_sheet_)
parent_style_sheet_->DidMutate();
}
void MediaList::Reattach(scoped_refptr<MediaQuerySet> media_queries) {
// TODO(keishi) Changed DCHECK to CHECK for crbug.com/699269 diagnosis
CHECK(media_queries);
for (const auto& query : media_queries->QueryVector()) {
CHECK(query);
}
media_queries_ = media_queries;
}
void MediaList::Trace(Visitor* visitor) const {
visitor->Trace(parent_style_sheet_);
visitor->Trace(parent_rule_);
ScriptWrappable::Trace(visitor);
}
} // namespace blink
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