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// Copyright (c) 2012 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 CONTENT_RENDERER_ANDROID_CONTENT_DETECTOR_H_
#define CONTENT_RENDERER_ANDROID_CONTENT_DETECTOR_H_
#include "third_party/WebKit/public/web/WebRange.h"
#include "url/gurl.h"
namespace blink {
class WebHitTestResult;
}
namespace content {
// Base class for text-based content detectors.
class ContentDetector {
public:
// Holds the content detection results.
struct Result {
Result();
Result(const blink::WebRange& content_boundaries,
const std::string& text,
const GURL& intent_url);
~Result();
bool valid;
blink::WebRange content_boundaries;
std::string text; // Processed text of the content.
GURL intent_url; // URL of the intent that should process this content.
};
virtual ~ContentDetector() {}
// Returns a WebKit range delimiting the contents found around the tapped
// position. If no content is found a null range will be returned.
Result FindTappedContent(const blink::WebHitTestResult& hit_test);
protected:
ContentDetector() {}
// Parses the input string defined by the begin/end iterators returning true
// if the desired content is found. The start and end positions relative to
// the input iterators are returned in start_pos and end_pos.
// The end position is assumed to be non-inclusive.
virtual bool FindContent(const base::string16::const_iterator& begin,
const base::string16::const_iterator& end,
size_t* start_pos,
size_t* end_pos,
std::string* content_text) = 0;
// Returns the intent URL that should process the content, if any.
virtual GURL GetIntentURL(const std::string& content_text) = 0;
// Returns the maximum length of text to be extracted around the tapped
// position in order to search for content.
virtual size_t GetMaximumContentLength() = 0;
blink::WebRange FindContentRange(const blink::WebHitTestResult& hit_test,
std::string* content_text);
DISALLOW_COPY_AND_ASSIGN(ContentDetector);
};
} // namespace content
#endif // CONTENT_RENDERER_ANDROID_CONTENT_DETECTOR_H_
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