1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
|
/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* (C) 2006 Alexey Proskuryakov (ap@webkit.org)
* Copyright (C) 2004-2009, 2011-2012, 2015 Apple Inc. All rights reserved.
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "AuthorStyleSheets.h"
#include "CSSStyleSheet.h"
#include "Element.h"
#include "ExtensionStyleSheets.h"
#include "HTMLIFrameElement.h"
#include "HTMLLinkElement.h"
#include "HTMLStyleElement.h"
#include "InspectorInstrumentation.h"
#include "Page.h"
#include "PageGroup.h"
#include "ProcessingInstruction.h"
#include "SVGNames.h"
#include "SVGStyleElement.h"
#include "Settings.h"
#include "ShadowRoot.h"
#include "StyleInvalidationAnalysis.h"
#include "StyleResolver.h"
#include "StyleSheetContents.h"
#include "StyleSheetList.h"
#include "UserContentController.h"
#include "UserContentURLPattern.h"
#include "UserStyleSheet.h"
namespace WebCore {
using namespace ContentExtensions;
using namespace HTMLNames;
AuthorStyleSheets::AuthorStyleSheets(Document& document)
: m_document(document)
{
}
AuthorStyleSheets::AuthorStyleSheets(ShadowRoot& shadowRoot)
: m_document(shadowRoot.documentScope())
, m_shadowRoot(&shadowRoot)
{
}
// This method is called whenever a top-level stylesheet has finished loading.
void AuthorStyleSheets::removePendingSheet(RemovePendingSheetNotificationType notification)
{
// Make sure we knew this sheet was pending, and that our count isn't out of sync.
ASSERT(m_pendingStyleSheetCount > 0);
m_pendingStyleSheetCount--;
#ifdef INSTRUMENT_LAYOUT_SCHEDULING
if (!ownerElement())
printf("Stylesheet loaded at time %d. %d stylesheets still remain.\n", elapsedTime(), m_pendingStylesheets);
#endif
if (m_pendingStyleSheetCount)
return;
if (notification == RemovePendingSheetNotifyLater) {
m_document.setNeedsNotifyRemoveAllPendingStylesheet();
return;
}
if (m_shadowRoot) {
m_shadowRoot->updateStyle();
return;
}
m_document.didRemoveAllPendingStylesheet();
}
void AuthorStyleSheets::addStyleSheetCandidateNode(Node& node, bool createdByParser)
{
if (!node.inDocument())
return;
// Until the <body> exists, we have no choice but to compare document positions,
// since styles outside of the body and head continue to be shunted into the head
// (and thus can shift to end up before dynamically added DOM content that is also
// outside the body).
if ((createdByParser && m_document.bodyOrFrameset()) || m_styleSheetCandidateNodes.isEmpty()) {
m_styleSheetCandidateNodes.add(&node);
return;
}
// Determine an appropriate insertion point.
auto begin = m_styleSheetCandidateNodes.begin();
auto end = m_styleSheetCandidateNodes.end();
auto it = end;
Node* followingNode = nullptr;
do {
--it;
Node* n = *it;
unsigned short position = n->compareDocumentPosition(&node);
if (position == Node::DOCUMENT_POSITION_FOLLOWING) {
m_styleSheetCandidateNodes.insertBefore(followingNode, &node);
return;
}
followingNode = n;
} while (it != begin);
m_styleSheetCandidateNodes.insertBefore(followingNode, &node);
}
void AuthorStyleSheets::removeStyleSheetCandidateNode(Node& node)
{
m_styleSheetCandidateNodes.remove(&node);
}
void AuthorStyleSheets::collectActiveStyleSheets(Vector<RefPtr<StyleSheet>>& sheets)
{
if (m_document.settings() && !m_document.settings()->authorAndUserStylesEnabled())
return;
for (auto& node : m_styleSheetCandidateNodes) {
StyleSheet* sheet = nullptr;
if (is<ProcessingInstruction>(*node)) {
// Processing instruction (XML documents only).
// We don't support linking to embedded CSS stylesheets, see <https://bugs.webkit.org/show_bug.cgi?id=49281> for discussion.
ProcessingInstruction& pi = downcast<ProcessingInstruction>(*node);
sheet = pi.sheet();
#if ENABLE(XSLT)
// Don't apply XSL transforms to already transformed documents -- <rdar://problem/4132806>
if (pi.isXSL() && !m_document.transformSourceDocument()) {
// Don't apply XSL transforms until loading is finished.
if (!m_document.parsing())
m_document.applyXSLTransform(&pi);
return;
}
#endif
} else if (is<HTMLLinkElement>(*node) || is<HTMLStyleElement>(*node) || is<SVGStyleElement>(*node)) {
Element& element = downcast<Element>(*node);
AtomicString title = element.fastGetAttribute(titleAttr);
bool enabledViaScript = false;
if (is<HTMLLinkElement>(element)) {
// <LINK> element
HTMLLinkElement& linkElement = downcast<HTMLLinkElement>(element);
if (linkElement.isDisabled())
continue;
enabledViaScript = linkElement.isEnabledViaScript();
if (linkElement.styleSheetIsLoading()) {
// it is loading but we should still decide which style sheet set to use
if (!enabledViaScript && !title.isEmpty() && m_preferredStylesheetSetName.isEmpty()) {
if (!linkElement.fastGetAttribute(relAttr).contains("alternate")) {
m_preferredStylesheetSetName = title;
m_selectedStylesheetSetName = title;
}
}
continue;
}
if (!linkElement.sheet())
title = nullAtom;
}
// Get the current preferred styleset. This is the
// set of sheets that will be enabled.
if (is<SVGStyleElement>(element))
sheet = downcast<SVGStyleElement>(element).sheet();
else if (is<HTMLLinkElement>(element))
sheet = downcast<HTMLLinkElement>(element).sheet();
else
sheet = downcast<HTMLStyleElement>(element).sheet();
// Check to see if this sheet belongs to a styleset
// (thus making it PREFERRED or ALTERNATE rather than
// PERSISTENT).
auto& rel = element.fastGetAttribute(relAttr);
if (!enabledViaScript && !title.isEmpty()) {
// Yes, we have a title.
if (m_preferredStylesheetSetName.isEmpty()) {
// No preferred set has been established. If
// we are NOT an alternate sheet, then establish
// us as the preferred set. Otherwise, just ignore
// this sheet.
if (is<HTMLStyleElement>(element) || !rel.contains("alternate"))
m_preferredStylesheetSetName = m_selectedStylesheetSetName = title;
}
if (title != m_preferredStylesheetSetName)
sheet = nullptr;
}
if (rel.contains("alternate") && title.isEmpty())
sheet = nullptr;
}
if (sheet)
sheets.append(sheet);
}
}
AuthorStyleSheets::StyleResolverUpdateType AuthorStyleSheets::analyzeStyleSheetChange(UpdateFlag updateFlag, const Vector<RefPtr<CSSStyleSheet>>& newStylesheets, bool& requiresFullStyleRecalc)
{
requiresFullStyleRecalc = true;
// Stylesheets of <style> elements that @import stylesheets are active but loading. We need to trigger a full recalc when such loads are done.
bool hasActiveLoadingStylesheet = false;
unsigned newStylesheetCount = newStylesheets.size();
for (auto& sheet : newStylesheets) {
if (sheet->isLoading())
hasActiveLoadingStylesheet = true;
}
if (m_hadActiveLoadingStylesheet && !hasActiveLoadingStylesheet) {
m_hadActiveLoadingStylesheet = false;
return Reconstruct;
}
m_hadActiveLoadingStylesheet = hasActiveLoadingStylesheet;
if (updateFlag != OptimizedUpdate)
return Reconstruct;
if (!m_document.styleResolverIfExists())
return Reconstruct;
StyleResolver& styleResolver = *m_document.styleResolverIfExists();
// Find out which stylesheets are new.
unsigned oldStylesheetCount = m_activeStyleSheets.size();
if (newStylesheetCount < oldStylesheetCount)
return Reconstruct;
Vector<StyleSheetContents*> addedSheets;
unsigned newIndex = 0;
for (unsigned oldIndex = 0; oldIndex < oldStylesheetCount; ++oldIndex) {
if (newIndex >= newStylesheetCount)
return Reconstruct;
while (m_activeStyleSheets[oldIndex] != newStylesheets[newIndex]) {
addedSheets.append(&newStylesheets[newIndex]->contents());
++newIndex;
if (newIndex == newStylesheetCount)
return Reconstruct;
}
++newIndex;
}
bool hasInsertions = !addedSheets.isEmpty();
while (newIndex < newStylesheetCount) {
addedSheets.append(&newStylesheets[newIndex]->contents());
++newIndex;
}
// If all new sheets were added at the end of the list we can just add them to existing StyleResolver.
// If there were insertions we need to re-add all the stylesheets so rules are ordered correctly.
auto styleResolverUpdateType = hasInsertions ? Reset : Additive;
// If we are already parsing the body and so may have significant amount of elements, put some effort into trying to avoid style recalcs.
if (!m_document.bodyOrFrameset() || m_document.hasNodesWithPlaceholderStyle())
return styleResolverUpdateType;
StyleInvalidationAnalysis invalidationAnalysis(addedSheets, styleResolver.mediaQueryEvaluator());
if (invalidationAnalysis.dirtiesAllStyle())
return styleResolverUpdateType;
invalidationAnalysis.invalidateStyle(m_document);
requiresFullStyleRecalc = false;
return styleResolverUpdateType;
}
static void filterEnabledNonemptyCSSStyleSheets(Vector<RefPtr<CSSStyleSheet>>& result, const Vector<RefPtr<StyleSheet>>& sheets)
{
for (auto& sheet : sheets) {
if (!is<CSSStyleSheet>(*sheet))
continue;
CSSStyleSheet& styleSheet = downcast<CSSStyleSheet>(*sheet);
if (styleSheet.disabled())
continue;
if (!styleSheet.length())
continue;
result.append(&styleSheet);
}
}
bool AuthorStyleSheets::updateActiveStyleSheets(UpdateFlag updateFlag)
{
if (m_document.inStyleRecalc()) {
// SVG <use> element may manage to invalidate style selector in the middle of a style recalc.
// https://bugs.webkit.org/show_bug.cgi?id=54344
// FIXME: This should be fixed in SVG and the call site replaced by ASSERT(!m_inStyleRecalc).
m_pendingUpdateType = FullUpdate;
m_document.scheduleForcedStyleRecalc();
return false;
}
if (!m_document.hasLivingRenderTree())
return false;
Vector<RefPtr<StyleSheet>> activeStyleSheets;
collectActiveStyleSheets(activeStyleSheets);
Vector<RefPtr<CSSStyleSheet>> activeCSSStyleSheets;
activeCSSStyleSheets.appendVector(m_document.extensionStyleSheets().injectedAuthorStyleSheets());
activeCSSStyleSheets.appendVector(m_document.extensionStyleSheets().authorStyleSheetsForTesting());
filterEnabledNonemptyCSSStyleSheets(activeCSSStyleSheets, activeStyleSheets);
bool requiresFullStyleRecalc;
auto styleResolverUpdateType = analyzeStyleSheetChange(updateFlag, activeCSSStyleSheets, requiresFullStyleRecalc);
updateStyleResolver(activeCSSStyleSheets, styleResolverUpdateType);
m_weakCopyOfActiveStyleSheetListForFastLookup = nullptr;
m_activeStyleSheets.swap(activeCSSStyleSheets);
m_styleSheetsForStyleSheetList.swap(activeStyleSheets);
InspectorInstrumentation::activeStyleSheetsUpdated(m_document);
for (const auto& sheet : m_activeStyleSheets) {
if (sheet->contents().usesRemUnits())
m_usesRemUnits = true;
if (sheet->contents().usesStyleBasedEditability())
m_usesStyleBasedEditability = true;
}
m_pendingUpdateType = NoUpdate;
return requiresFullStyleRecalc;
}
void AuthorStyleSheets::updateStyleResolver(Vector<RefPtr<CSSStyleSheet>>& activeStyleSheets, StyleResolverUpdateType updateType)
{
if (updateType == Reconstruct) {
if (m_shadowRoot)
m_shadowRoot->resetStyleResolver();
else
m_document.clearStyleResolver();
return;
}
auto& styleResolver = m_document.ensureStyleResolver();
auto& userAgentShadowTreeStyleResolver = m_document.userAgentShadowTreeStyleResolver();
if (updateType == Reset) {
styleResolver.ruleSets().resetAuthorStyle();
styleResolver.appendAuthorStyleSheets(activeStyleSheets);
} else {
ASSERT(updateType == Additive);
unsigned firstNewIndex = m_activeStyleSheets.size();
Vector<RefPtr<CSSStyleSheet>> newStyleSheets;
newStyleSheets.appendRange(activeStyleSheets.begin() + firstNewIndex, activeStyleSheets.end());
styleResolver.appendAuthorStyleSheets(newStyleSheets);
}
userAgentShadowTreeStyleResolver.ruleSets().resetAuthorStyle();
auto& authorRuleSet = *styleResolver.ruleSets().authorStyle();
if (authorRuleSet.hasShadowPseudoElementRules())
userAgentShadowTreeStyleResolver.ruleSets().authorStyle()->copyShadowPseudoElementRulesFrom(authorRuleSet);
}
const Vector<RefPtr<CSSStyleSheet>> AuthorStyleSheets::activeStyleSheetsForInspector() const
{
Vector<RefPtr<CSSStyleSheet>> result;
result.appendVector(m_document.extensionStyleSheets().injectedAuthorStyleSheets());
result.appendVector(m_document.extensionStyleSheets().authorStyleSheetsForTesting());
for (auto& styleSheet : m_styleSheetsForStyleSheetList) {
if (!is<CSSStyleSheet>(*styleSheet))
continue;
CSSStyleSheet& sheet = downcast<CSSStyleSheet>(*styleSheet);
if (sheet.disabled())
continue;
result.append(&sheet);
}
return result;
}
bool AuthorStyleSheets::activeStyleSheetsContains(const CSSStyleSheet* sheet) const
{
if (!m_weakCopyOfActiveStyleSheetListForFastLookup) {
m_weakCopyOfActiveStyleSheetListForFastLookup = std::make_unique<HashSet<const CSSStyleSheet*>>();
for (auto& activeStyleSheet : m_activeStyleSheets)
m_weakCopyOfActiveStyleSheetListForFastLookup->add(activeStyleSheet.get());
}
return m_weakCopyOfActiveStyleSheetListForFastLookup->contains(sheet);
}
}
|
