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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "core/css/ActiveStyleSheets.h" | 5 #include "core/css/ActiveStyleSheets.h" |
6 | 6 |
7 #include "core/css/CSSStyleSheet.h" | 7 #include "core/css/CSSStyleSheet.h" |
8 #include "core/css/RuleSet.h" | 8 #include "core/css/RuleSet.h" |
9 #include "core/css/resolver/ScopedStyleResolver.h" | 9 #include "core/css/resolver/ScopedStyleResolver.h" |
10 #include "core/dom/ContainerNode.h" | 10 #include "core/dom/ContainerNode.h" |
11 #include "core/dom/StyleChangeReason.h" | 11 #include "core/dom/StyleChangeReason.h" |
12 #include "core/dom/StyleEngine.h" | 12 #include "core/dom/StyleEngine.h" |
13 | 13 |
14 namespace blink { | 14 namespace blink { |
15 | 15 |
16 ActiveSheetsChange compareActiveStyleSheets( | 16 ActiveSheetsChange compareActiveStyleSheets( |
17 const ActiveStyleSheetVector& oldStyleSheets, | 17 const ActiveStyleSheetVector& oldStyleSheets, |
18 const ActiveStyleSheetVector& newStyleSheets, | 18 const ActiveStyleSheetVector& newStyleSheets, |
19 HeapVector<Member<RuleSet>>& changedRuleSets) { | 19 HeapHashSet<Member<RuleSet>>& changedRuleSets) { |
20 unsigned newStyleSheetCount = newStyleSheets.size(); | 20 unsigned newStyleSheetCount = newStyleSheets.size(); |
21 unsigned oldStyleSheetCount = oldStyleSheets.size(); | 21 unsigned oldStyleSheetCount = oldStyleSheets.size(); |
22 | 22 |
23 unsigned minCount = std::min(newStyleSheetCount, oldStyleSheetCount); | 23 unsigned minCount = std::min(newStyleSheetCount, oldStyleSheetCount); |
24 unsigned index = 0; | 24 unsigned index = 0; |
25 | 25 |
26 // Walk the common prefix of stylesheets. If the stylesheet rules were | 26 // Walk the common prefix of stylesheets. If the stylesheet rules were |
27 // modified since last time, add them to the list of changed rulesets. | 27 // modified since last time, add them to the list of changed rulesets. |
28 for (; index < minCount && | 28 for (; index < minCount && |
29 newStyleSheets[index].first == oldStyleSheets[index].first; | 29 newStyleSheets[index].first == oldStyleSheets[index].first; |
30 index++) { | 30 index++) { |
31 if (newStyleSheets[index].second == oldStyleSheets[index].second) | 31 if (newStyleSheets[index].second == oldStyleSheets[index].second) |
32 continue; | 32 continue; |
33 | 33 |
34 if (newStyleSheets[index].second) | 34 if (newStyleSheets[index].second) |
35 changedRuleSets.append(newStyleSheets[index].second); | 35 changedRuleSets.add(newStyleSheets[index].second); |
36 if (oldStyleSheets[index].second) | 36 if (oldStyleSheets[index].second) |
37 changedRuleSets.append(oldStyleSheets[index].second); | 37 changedRuleSets.add(oldStyleSheets[index].second); |
38 } | 38 } |
39 | 39 |
40 if (index == oldStyleSheetCount) { | 40 if (index == oldStyleSheetCount) { |
41 if (index == newStyleSheetCount) | 41 if (index == newStyleSheetCount) { |
42 return changedRuleSets.size() ? ActiveSheetsChanged | 42 return changedRuleSets.isEmpty() ? NoActiveSheetsChanged |
43 : NoActiveSheetsChanged; | 43 : ActiveSheetsChanged; |
| 44 } |
44 | 45 |
45 // Sheets added at the end. | 46 // Sheets added at the end. |
46 for (; index < newStyleSheetCount; index++) { | 47 for (; index < newStyleSheetCount; index++) { |
47 if (newStyleSheets[index].second) | 48 if (newStyleSheets[index].second) |
48 changedRuleSets.append(newStyleSheets[index].second); | 49 changedRuleSets.add(newStyleSheets[index].second); |
49 } | 50 } |
50 return changedRuleSets.size() ? ActiveSheetsAppended | 51 return changedRuleSets.isEmpty() ? NoActiveSheetsChanged |
51 : NoActiveSheetsChanged; | 52 : ActiveSheetsAppended; |
52 } | 53 } |
53 | 54 |
54 if (index == newStyleSheetCount) { | 55 if (index == newStyleSheetCount) { |
55 // Sheets removed from the end. | 56 // Sheets removed from the end. |
56 for (; index < oldStyleSheetCount; index++) { | 57 for (; index < oldStyleSheetCount; index++) { |
57 if (oldStyleSheets[index].second) | 58 if (oldStyleSheets[index].second) |
58 changedRuleSets.append(oldStyleSheets[index].second); | 59 changedRuleSets.add(oldStyleSheets[index].second); |
59 } | 60 } |
60 return changedRuleSets.size() ? ActiveSheetsChanged : NoActiveSheetsChanged; | 61 return changedRuleSets.isEmpty() ? NoActiveSheetsChanged |
| 62 : ActiveSheetsChanged; |
61 } | 63 } |
62 | 64 |
63 DCHECK(index < oldStyleSheetCount && index < newStyleSheetCount); | 65 DCHECK(index < oldStyleSheetCount && index < newStyleSheetCount); |
64 | 66 |
65 // Both the new and old active stylesheet vectors have stylesheets following | 67 // Both the new and old active stylesheet vectors have stylesheets following |
66 // the common prefix. Figure out which were added or removed by sorting the | 68 // the common prefix. Figure out which were added or removed by sorting the |
67 // merged vector of old and new sheets. | 69 // merged vector of old and new sheets. |
68 | 70 |
69 ActiveStyleSheetVector mergedSorted; | 71 ActiveStyleSheetVector mergedSorted; |
70 mergedSorted.reserveCapacity(oldStyleSheetCount + newStyleSheetCount - | 72 mergedSorted.reserveCapacity(oldStyleSheetCount + newStyleSheetCount - |
71 2 * index); | 73 2 * index); |
72 mergedSorted.appendRange(oldStyleSheets.begin() + index, | 74 mergedSorted.appendRange(oldStyleSheets.begin() + index, |
73 oldStyleSheets.end()); | 75 oldStyleSheets.end()); |
74 mergedSorted.appendRange(newStyleSheets.begin() + index, | 76 mergedSorted.appendRange(newStyleSheets.begin() + index, |
75 newStyleSheets.end()); | 77 newStyleSheets.end()); |
76 | 78 |
77 std::sort(mergedSorted.begin(), mergedSorted.end()); | 79 std::sort(mergedSorted.begin(), mergedSorted.end()); |
78 | 80 |
79 auto mergedIterator = mergedSorted.begin(); | 81 auto mergedIterator = mergedSorted.begin(); |
80 while (mergedIterator != mergedSorted.end()) { | 82 while (mergedIterator != mergedSorted.end()) { |
81 const auto& sheet1 = *mergedIterator++; | 83 const auto& sheet1 = *mergedIterator++; |
82 if (mergedIterator == mergedSorted.end() || | 84 if (mergedIterator == mergedSorted.end() || |
83 (*mergedIterator).first != sheet1.first) { | 85 (*mergedIterator).first != sheet1.first) { |
84 // Sheet either removed or inserted. | 86 // Sheet either removed or inserted. |
85 if (sheet1.second) | 87 if (sheet1.second) |
86 changedRuleSets.append(sheet1.second); | 88 changedRuleSets.add(sheet1.second); |
87 continue; | 89 continue; |
88 } | 90 } |
89 | 91 |
90 // Sheet present in both old and new. | 92 // Sheet present in both old and new. |
91 const auto& sheet2 = *mergedIterator++; | 93 const auto& sheet2 = *mergedIterator++; |
92 | 94 |
93 if (sheet1.second == sheet2.second) | 95 if (sheet1.second == sheet2.second) |
94 continue; | 96 continue; |
95 | 97 |
96 // Active rules for the given stylesheet changed. | 98 // Active rules for the given stylesheet changed. |
97 // DOM, CSSOM, or media query changes. | 99 // DOM, CSSOM, or media query changes. |
98 if (sheet1.second) | 100 if (sheet1.second) |
99 changedRuleSets.append(sheet1.second); | 101 changedRuleSets.add(sheet1.second); |
100 if (sheet2.second) | 102 if (sheet2.second) |
101 changedRuleSets.append(sheet2.second); | 103 changedRuleSets.add(sheet2.second); |
102 } | 104 } |
103 return changedRuleSets.size() ? ActiveSheetsChanged : NoActiveSheetsChanged; | 105 return changedRuleSets.isEmpty() ? NoActiveSheetsChanged |
| 106 : ActiveSheetsChanged; |
104 } | 107 } |
105 | 108 |
106 } // namespace blink | 109 } // namespace blink |
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