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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 #include "headless/public/util/dom_tree_extractor.h" |
| 6 |
| 7 #include "base/bind.h" |
| 8 #include "base/json/json_writer.h" |
| 9 #include "headless/public/headless_devtools_client.h" |
| 10 |
| 11 namespace headless { |
| 12 |
| 13 DomTreeExtractor::DomTreeExtractor(HeadlessDevToolsClient* devtools_client) |
| 14 : work_in_progress_(false), |
| 15 devtools_client_(devtools_client), |
| 16 weak_factory_(this) {} |
| 17 |
| 18 DomTreeExtractor::~DomTreeExtractor() {} |
| 19 |
| 20 void DomTreeExtractor::ExtractDomTree( |
| 21 const std::vector<std::string>& css_style_whitelist, |
| 22 DomResultCB callback) { |
| 23 DCHECK(!work_in_progress_); |
| 24 work_in_progress_ = true; |
| 25 |
| 26 callback_ = std::move(callback); |
| 27 |
| 28 devtools_client_->GetDOM()->GetDocument( |
| 29 dom::GetDocumentParams::Builder() |
| 30 .SetDepth(-1) |
| 31 .SetTraverseFrames(true) |
| 32 .Build(), |
| 33 base::Bind(&DomTreeExtractor::OnDocumentFetched, |
| 34 weak_factory_.GetWeakPtr())); |
| 35 |
| 36 devtools_client_->GetCSS()->GetExperimental()->GetLayoutTreeAndStyles( |
| 37 css::GetLayoutTreeAndStylesParams::Builder() |
| 38 .SetComputedStyleWhitelist(css_style_whitelist) |
| 39 .Build(), |
| 40 base::Bind(&DomTreeExtractor::OnLayoutTreeAndStylesFetched, |
| 41 weak_factory_.GetWeakPtr())); |
| 42 } |
| 43 |
| 44 void DomTreeExtractor::OnDocumentFetched( |
| 45 std::unique_ptr<dom::GetDocumentResult> result) { |
| 46 dom_tree_.document_result_ = std::move(result); |
| 47 MaybeExtractDomTree(); |
| 48 } |
| 49 |
| 50 void DomTreeExtractor::OnLayoutTreeAndStylesFetched( |
| 51 std::unique_ptr<css::GetLayoutTreeAndStylesResult> result) { |
| 52 dom_tree_.layout_tree_and_styles_result_ = std::move(result); |
| 53 MaybeExtractDomTree(); |
| 54 } |
| 55 |
| 56 void DomTreeExtractor::MaybeExtractDomTree() { |
| 57 if (dom_tree_.document_result_ && dom_tree_.layout_tree_and_styles_result_) { |
| 58 EnumerateNodes(dom_tree_.document_result_->GetRoot()); |
| 59 ExtractLayoutTreeNodes(); |
| 60 ExtractComputedStyles(); |
| 61 |
| 62 work_in_progress_ = false; |
| 63 |
| 64 callback_.Run(std::move(dom_tree_)); |
| 65 } |
| 66 } |
| 67 |
| 68 void DomTreeExtractor::EnumerateNodes(const dom::Node* node) { |
| 69 // Allocate an index and record the node pointer. |
| 70 size_t index = dom_tree_.node_id_to_index_.size(); |
| 71 dom_tree_.node_id_to_index_[node->GetNodeId()] = index; |
| 72 dom_tree_.dom_nodes_.push_back(node); |
| 73 |
| 74 if (node->HasContentDocument()) |
| 75 EnumerateNodes(node->GetContentDocument()); |
| 76 |
| 77 if (node->HasChildren()) { |
| 78 for (const std::unique_ptr<dom::Node>& child : *node->GetChildren()) { |
| 79 EnumerateNodes(child.get()); |
| 80 } |
| 81 } |
| 82 } |
| 83 |
| 84 void DomTreeExtractor::ExtractLayoutTreeNodes() { |
| 85 dom_tree_.layout_tree_nodes_.reserve( |
| 86 dom_tree_.layout_tree_and_styles_result_->GetLayoutTreeNodes()->size()); |
| 87 |
| 88 // Only extract layout tree nodes that map to a DOM node. |
| 89 for (const std::unique_ptr<css::LayoutTreeNode>& layout_node : |
| 90 *dom_tree_.layout_tree_and_styles_result_->GetLayoutTreeNodes()) { |
| 91 std::unordered_map<NodeId, size_t>::const_iterator it = |
| 92 dom_tree_.node_id_to_index_.find(layout_node->GetBackendNodeId()); |
| 93 if (it == dom_tree_.node_id_to_index_.end()) |
| 94 continue; |
| 95 |
| 96 dom_tree_.layout_tree_nodes_.push_back(layout_node.get()); |
| 97 } |
| 98 } |
| 99 |
| 100 void DomTreeExtractor::ExtractComputedStyles() { |
| 101 dom_tree_.computed_styles_.reserve( |
| 102 dom_tree_.layout_tree_and_styles_result_->GetComputedStyles()->size()); |
| 103 |
| 104 for (const std::unique_ptr<css::ComputedStyle>& computed_style : |
| 105 *dom_tree_.layout_tree_and_styles_result_->GetComputedStyles()) { |
| 106 dom_tree_.computed_styles_.push_back(computed_style.get()); |
| 107 } |
| 108 } |
| 109 |
| 110 DomTreeExtractor::DomTree::DomTree() {} |
| 111 DomTreeExtractor::DomTree::~DomTree() {} |
| 112 |
| 113 DomTreeExtractor::DomTree::DomTree(DomTree&& other) = default; |
| 114 |
| 115 } // namespace headless |
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