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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.
#include "content/renderer/android/content_detector.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebHitTestResult.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebSurroundingText.h"
using WebKit::WebRange;
using WebKit::WebSurroundingText;
namespace content {
ContentDetector::Result ContentDetector::FindTappedContent(
const WebKit::WebHitTestResult& hit_test) {
if (hit_test.isNull())
return Result();
std::string content_text;
WebKit::WebRange range = FindContentRange(hit_test, &content_text);
if (range.isNull())
return Result();
GURL intent_url = GetIntentURL(content_text);
return Result(range, content_text, intent_url);
}
WebRange ContentDetector::FindContentRange(
const WebKit::WebHitTestResult& hit_test, std::string* content_text) {
// As the surrounding text extractor looks at maxLength/2 characters on
// either side of the hit point, we need to double max content length here.
WebSurroundingText surrounding_text;
surrounding_text.initialize(hit_test, GetMaximumContentLength() * 2);
if (surrounding_text.isNull())
return WebRange();
string16 content = surrounding_text.textContent();
if (content.empty())
return WebRange();
size_t selected_offset = surrounding_text.hitOffsetInTextContent();
for (size_t start_offset = 0; start_offset < content.length();) {
size_t relative_start, relative_end;
if (!FindContent(content.begin() + start_offset,
content.end(), &relative_start, &relative_end, content_text)) {
break;
} else {
size_t content_start = start_offset + relative_start;
size_t content_end = start_offset + relative_end;
DCHECK(content_end <= content.length());
if (selected_offset >= content_start && selected_offset < content_end) {
WebRange range = surrounding_text.rangeFromContentOffsets(
content_start, content_end);
DCHECK(!range.isNull());
return range;
} else {
start_offset += relative_end;
}
}
}
return WebRange();
}
} // namespace content
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