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1 // Copyright 2016 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 #ifndef HEADLESS_PUBLIC_UTIL_DOM_TREE_EXTRACTOR_H_ | |
6 #define HEADLESS_PUBLIC_UTIL_DOM_TREE_EXTRACTOR_H_ | |
7 | |
8 #include <unordered_map> | |
9 #include <vector> | |
10 | |
11 #include "base/macros.h" | |
12 #include "headless/public/domains/css.h" | |
13 #include "headless/public/domains/dom.h" | |
14 | |
15 namespace headless { | |
16 class HeadlessDevToolsClient; | |
17 | |
18 // A utility class for extracting information from the DOM via DevTools. In | |
19 // addition it also extracts details of bounding boxes and layout text (NB the | |
Eric Seckler
2016/10/20 08:43:58
super-nit: addition,
alex clarke (OOO till 29th)
2016/10/20 09:26:25
Done.
| |
20 // exact layout should not be regarded as stable, it's subject to change without | |
21 // notice). | |
22 class DomTreeExtractor { | |
23 public: | |
24 explicit DomTreeExtractor(HeadlessDevToolsClient* devtools_client); | |
25 ~DomTreeExtractor(); | |
26 | |
27 using NodeId = int; | |
28 using Index = size_t; | |
29 | |
30 class DomTree { | |
31 public: | |
32 DomTree(); | |
33 DomTree(DomTree&& other); | |
34 ~DomTree(); | |
35 | |
36 // Flattened dom tree. The root node is always the first entry. | |
37 std::vector<const dom::Node*> dom_nodes_; | |
38 | |
39 // Map of node IDs to indexes into |dom_nodes_|. | |
40 std::unordered_map<NodeId, Index> node_id_to_index_; | |
41 | |
42 std::vector<const css::LayoutTreeNode*> layout_tree_nodes_; | |
43 | |
44 std::vector<const css::ComputedStyle*> computed_styles_; | |
45 | |
46 private: | |
47 friend class DomTreeExtractor; | |
48 | |
49 // Owns the raw pointers in |dom_nodes_|. | |
50 std::unique_ptr<dom::GetDocumentResult> document_result_; | |
51 | |
52 // Owns the raw pointers in |layout_tree_nodes_|. | |
53 std::unique_ptr<css::GetLayoutTreeAndStylesResult> | |
54 layout_tree_and_styles_result_; | |
55 | |
56 DISALLOW_COPY_AND_ASSIGN(DomTree); | |
57 }; | |
58 | |
59 using DomResultCB = base::Callback<void(DomTree)>; | |
60 | |
61 // Extracts all nodes from the DOM. This is an asynchronous operation and | |
62 // it's an error to call ExtractDom while a previous operation is in flight. | |
63 void ExtractDomTree(const std::vector<std::string>& css_style_whitelist, | |
64 DomResultCB callback); | |
65 | |
66 private: | |
67 void OnDocumentFetched(std::unique_ptr<dom::GetDocumentResult> result); | |
68 | |
69 void OnLayoutTreeAndStylesFetched( | |
70 std::unique_ptr<css::GetLayoutTreeAndStylesResult> result); | |
71 | |
72 void MaybeExtractDomTree(); | |
73 void EnumerateNodes(const dom::Node* node); | |
74 void ExtractLayoutTreeNodes(); | |
75 void ExtractComputedStyles(); | |
76 | |
77 DomResultCB callback_; | |
78 DomTree dom_tree_; | |
79 bool work_in_progress_; | |
80 HeadlessDevToolsClient* devtools_client_; // NOT OWNED | |
81 base::WeakPtrFactory<DomTreeExtractor> weak_factory_; | |
82 | |
83 DISALLOW_COPY_AND_ASSIGN(DomTreeExtractor); | |
84 }; | |
85 | |
86 } // namespace headless | |
87 | |
88 #endif // HEADLESS_PUBLIC_UTIL_DOM_TREE_EXTRACTOR_H_ | |
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