1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "content/renderer/android/content_detector.h"
6
7 #include "base/logging.h"
8 #include "third_party/WebKit/public/platform/WebPoint.h"
9 #include "third_party/WebKit/public/web/WebHitTestResult.h"
10 #include "third_party/WebKit/public/web/WebSurroundingText.h"
11
12 using blink::WebRange;
13 using blink::WebSurroundingText;
14
15 namespace content {
16
Result()17 ContentDetector::Result::Result() : valid(false) {}
18
Result(const blink::WebRange & content_boundaries,const std::string & text,const GURL & intent_url)19 ContentDetector::Result::Result(const blink::WebRange& content_boundaries,
20 const std::string& text,
21 const GURL& intent_url)
22 : valid(true),
23 content_boundaries(content_boundaries),
24 text(text),
25 intent_url(intent_url) {
26 }
27
~Result()28 ContentDetector::Result::~Result() {}
29
FindTappedContent(const blink::WebHitTestResult & hit_test)30 ContentDetector::Result ContentDetector::FindTappedContent(
31 const blink::WebHitTestResult& hit_test) {
32 if (hit_test.isNull())
33 return Result();
34
35 std::string content_text;
36 blink::WebRange range = FindContentRange(hit_test, &content_text);
37 if (range.isNull())
38 return Result();
39
40 GURL intent_url = GetIntentURL(content_text);
41 return Result(range, content_text, intent_url);
42 }
43
FindContentRange(const blink::WebHitTestResult & hit_test,std::string * content_text)44 WebRange ContentDetector::FindContentRange(
45 const blink::WebHitTestResult& hit_test,
46 std::string* content_text) {
47 // As the surrounding text extractor looks at maxLength/2 characters on
48 // either side of the hit point, we need to double max content length here.
49 WebSurroundingText surrounding_text;
50 surrounding_text.initialize(hit_test.node(), hit_test.localPoint(),
51 GetMaximumContentLength() * 2);
52 if (surrounding_text.isNull())
53 return WebRange();
54
55 base::string16 content = surrounding_text.textContent();
56 if (content.empty())
57 return WebRange();
58
59 size_t selected_offset = surrounding_text.hitOffsetInTextContent();
60 for (size_t start_offset = 0; start_offset < content.length();) {
61 size_t relative_start, relative_end;
62 if (!FindContent(content.begin() + start_offset,
63 content.end(), &relative_start, &relative_end, content_text)) {
64 break;
65 } else {
66 size_t content_start = start_offset + relative_start;
67 size_t content_end = start_offset + relative_end;
68 DCHECK(content_end <= content.length());
69
70 if (selected_offset >= content_start && selected_offset < content_end) {
71 WebRange range = surrounding_text.rangeFromContentOffsets(
72 content_start, content_end);
73 DCHECK(!range.isNull());
74 return range;
75 } else {
76 start_offset += relative_end;
77 }
78 }
79 }
80
81 return WebRange();
82 }
83
84 } // namespace content
85