| /* |
| * (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 "core/css/MediaList.h" |
| |
| #include <memory> |
| #include "bindings/core/v8/ExceptionState.h" |
| #include "core/css/CSSStyleSheet.h" |
| #include "core/css/MediaQueryExp.h" |
| #include "core/css/parser/MediaQueryParser.h" |
| #include "platform/wtf/text/StringBuilder.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) { |
| if (media_string.IsEmpty()) |
| return MediaQuerySet::Create(); |
| |
| return MediaQueryParser::ParseMediaQuerySet(media_string); |
| } |
| |
| bool MediaQuerySet::Set(const String& media_string) { |
| scoped_refptr<MediaQuerySet> result = Create(media_string); |
| // 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) { |
| // 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); |
| |
| // 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); |
| |
| // If comparing with any of the media queries in the collection of media |
| // queries returns true terminate these steps. |
| for (size_t i = 0; i < queries_.size(); ++i) { |
| MediaQuery& query = *queries_[i]; |
| if (query == *new_query) |
| return true; |
| } |
| |
| queries_.push_back(std::move(new_query)); |
| return true; |
| } |
| |
| bool MediaQuerySet::Remove(const String& query_string_to_remove) { |
| // 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); |
| |
| // 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 (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 (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 String& value) { |
| CSSStyleSheet::RuleMutationScope mutation_scope(parent_rule_); |
| |
| media_queries_->Set(value); |
| |
| 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 String& medium, |
| ExceptionState& exception_state) { |
| CSSStyleSheet::RuleMutationScope mutation_scope(parent_rule_); |
| |
| bool success = media_queries_->Remove(medium); |
| if (!success) { |
| exception_state.ThrowDOMException(kNotFoundError, |
| "Failed to delete '" + medium + "'."); |
| return; |
| } |
| if (parent_style_sheet_) |
| parent_style_sheet_->DidMutate(); |
| } |
| |
| void MediaList::appendMedium(const String& medium, |
| ExceptionState& exception_state) { |
| CSSStyleSheet::RuleMutationScope mutation_scope(parent_rule_); |
| |
| bool success = media_queries_->Add(medium); |
| if (!success) { |
| exception_state.ThrowDOMException( |
| kInvalidCharacterError, |
| "The value provided ('" + medium + "') is not a valid medium."); |
| 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(blink::Visitor* visitor) { |
| visitor->Trace(parent_style_sheet_); |
| visitor->Trace(parent_rule_); |
| ScriptWrappable::Trace(visitor); |
| } |
| |
| } // namespace blink |