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1 // Copyright 2017 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 "modules/document_metadata/CopylessPasteExtractor.h" | |
6 | |
7 #include "core/HTMLNames.h" | |
8 #include "core/dom/Document.h" | |
9 #include "core/dom/ElementTraversal.h" | |
10 #include "core/frame/LocalFrame.h" | |
11 #include "core/html/HTMLElement.h" | |
12 #include "platform/Histogram.h" | |
13 #include "platform/instrumentation/tracing/TraceEvent.h" | |
14 #include "wtf/text/StringBuilder.h" | |
15 | |
16 namespace blink { | |
17 | |
18 namespace { | |
19 | |
20 String extractMetadata(Element& root) { | |
21 StringBuilder result; | |
22 result.append("["); | |
23 bool multiple = false; | |
24 for (Element& element : ElementTraversal::descendantsOf(root)) { | |
25 if (element.hasTagName(HTMLNames::scriptTag) && | |
26 element.getAttribute(HTMLNames::typeAttr) == "application/ld+json") { | |
27 if (multiple) { | |
28 result.append(","); | |
29 } | |
30 result.append(element.textContent()); | |
31 multiple = true; | |
32 } | |
33 } | |
34 result.append("]"); | |
35 return result.toString(); | |
36 } | |
37 | |
38 } // namespace | |
39 | |
40 String CopylessPasteExtractor::extract(Document& document) { | |
41 TRACE_EVENT0("blink", "CopylessPasteExtractor::extract"); | |
42 | |
43 if (!document.frame() || !document.frame()->isMainFrame()) | |
44 return emptyString; | |
45 | |
46 DCHECK(document.hasFinishedParsing()); | |
47 | |
48 Element* html = document.documentElement(); | |
49 if (!html) | |
50 return emptyString; | |
51 | |
52 double startTime = monotonicallyIncreasingTime(); | |
53 | |
54 // Traverse the DOM tree and extract the metadata. | |
55 String result = extractMetadata(*html); | |
56 | |
57 double elapsedTime = monotonicallyIncreasingTime() - startTime; | |
58 | |
59 DEFINE_STATIC_LOCAL(CustomCountHistogram, extractionHistogram, | |
60 ("CopylessPaste.ExtractionUs", 1, 1000000, 50)); | |
haraken
2017/02/16 02:33:35
Have you already added the histogram to histograms
wychen
2017/02/16 17:29:30
Oops. Thanks for your eagle eyes!
| |
61 extractionHistogram.count(static_cast<int>(1e6 * elapsedTime)); | |
62 return result; | |
63 } | |
64 | |
65 } // namespace blink | |
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