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// Copyright 2014 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.
#ifndef COBALT_DOM_HTML_LINK_ELEMENT_H_
#define COBALT_DOM_HTML_LINK_ELEMENT_H_
#include <memory>
#include <string>
#include <vector>
#include "base/optional.h"
#include "base/threading/thread_checker.h"
#include "cobalt/cssom/style_sheet.h"
#include "cobalt/dom/html_element.h"
#include "cobalt/loader/fetcher_factory.h"
#include "cobalt/loader/loader.h"
#include "cobalt/loader/text_decoder.h"
#include "cobalt/web/url_utils.h"
namespace cobalt {
namespace dom {
class Document;
// The link element allows authors to link their document to other resources.
// https://www.w3.org/TR/html50/document-metadata.html#the-link-element
class HTMLLinkElement : public HTMLElement {
public:
static const char kTagName[];
static const std::vector<std::string> kSupportedRelValues;
explicit HTMLLinkElement(Document* document)
: HTMLElement(document, base::Token(kTagName)) {}
// Web API: HTMLLinkElement
//
std::string rel() const { return GetAttribute("rel").value_or(""); }
void set_rel(const std::string& value) { SetAttribute("rel", value); }
std::string type() const { return GetAttribute("type").value_or(""); }
void set_type(const std::string& value) { SetAttribute("type", value); }
std::string href() const { return GetAttribute("href").value_or(""); }
void set_href(const std::string& value) { SetAttribute("href", value); }
base::Optional<std::string> cross_origin() const;
void set_cross_origin(const base::Optional<std::string>& value);
// Custom, not in any spec.
//
scoped_refptr<HTMLLinkElement> AsHTMLLinkElement() override { return this; }
// From Node.
void OnInsertedIntoDocument() override;
void OnRemovedFromDocument() override;
// Create Performance Resource Timing entry for link element.
void GetLoadTimingInfoAndCreateResourceTiming();
DEFINE_WRAPPABLE_TYPE(HTMLLinkElement);
protected:
~HTMLLinkElement() override {}
private:
void ResolveAndSetAbsoluteURL();
// From the spec: HTMLLinkElement.
virtual void Obtain();
void OnContentProduced(const loader::Origin& last_url_origin,
std::unique_ptr<std::string> content);
void OnLoadingComplete(const base::Optional<std::string>& error);
void OnSplashscreenLoaded(Document* document, const std::string& content);
void OnStylesheetLoaded(Document* document, const std::string& content);
void ReleaseLoader();
// Add this element's style sheet to the style sheet vector.
void CollectStyleSheet(cssom::StyleSheetVector* style_sheets) const override;
// Thread checker ensures all calls to DOM element are made from the same
// thread that it is created in.
THREAD_CHECKER(thread_checker_);
// The loader.
std::unique_ptr<loader::Loader> loader_;
// Absolute link url.
GURL absolute_url_;
// The style sheet associated with this element.
scoped_refptr<cssom::StyleSheet> style_sheet_;
// The origin of fetch request's final destination.
loader::Origin fetched_last_url_origin_;
// The request mode for the fetch request.
loader::RequestMode request_mode_;
};
} // namespace dom
} // namespace cobalt
#endif // COBALT_DOM_HTML_LINK_ELEMENT_H_