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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_RENDERER_CONTENT_WATCHER_H_
#define EXTENSIONS_RENDERER_CONTENT_WATCHER_H_
#include <map>
#include <set>
#include <string>
#include <vector>
#include "third_party/WebKit/public/platform/WebVector.h"
namespace blink {
class WebFrame;
class WebLocalFrame;
class WebString;
}
namespace extensions {
class Dispatcher;
class Extension;
class NativeHandler;
// Watches the content of WebFrames to notify extensions when they match various
// patterns. This class tracks the set of relevant patterns (set by
// ExtensionMsg_WatchPages) and the set that match on each WebFrame, and sends a
// ExtensionHostMsg_OnWatchedPageChange whenever a RenderView's set changes.
//
// There's one ContentWatcher per Dispatcher rather than per RenderView because
// WebFrames can move between RenderViews through adoptNode.
// TODO(devlin): This class isn't OOPI-safe.
class ContentWatcher {
public:
ContentWatcher();
~ContentWatcher();
// Handler for ExtensionMsg_WatchPages.
void OnWatchPages(const std::vector<std::string>& css_selectors);
// Uses WebDocument::watchCSSSelectors to watch the selectors in
// css_selectors_ and get a callback into DidMatchCSS() whenever the set of
// matching selectors in |frame| changes.
void DidCreateDocumentElement(blink::WebLocalFrame* frame);
// Records that |newly_matching_selectors| have started matching on |*frame|,
// and |stopped_matching_selectors| have stopped matching.
void DidMatchCSS(
blink::WebLocalFrame* frame,
const blink::WebVector<blink::WebString>& newly_matching_selectors,
const blink::WebVector<blink::WebString>& stopped_matching_selectors);
private:
// Given that we saw a change in the CSS selectors that |changed_frame|
// matched, tell the browser about the new set of matching selectors in its
// top-level page. We filter this so that if an extension were to be granted
// activeTab permission on that top-level page, we only send CSS selectors for
// frames that it could run on.
void NotifyBrowserOfChange(blink::WebLocalFrame* changed_frame) const;
// If any of these selectors match on a page, we need to send an
// ExtensionHostMsg_OnWatchedPageChange back to the browser.
blink::WebVector<blink::WebString> css_selectors_;
// Maps live WebFrames to the set of CSS selectors they match. Blink sends
// back diffs, which we apply to these sets.
std::map<blink::WebFrame*, std::set<std::string> > matching_selectors_;
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_CONTENT_WATCHER_H_
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