-
Notifications
You must be signed in to change notification settings - Fork 1.3k
/
CSSSelector.h
445 lines (369 loc) · 15 KB
/
CSSSelector.h
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
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
/*
* Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
* 1999 Waldo Bastian (bastian@kde.org)
* Copyright (C) 2004-2022 Apple Inc. 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.
*/
#pragma once
#include "CSSSelectorEnums.h"
#include "QualifiedName.h"
#include "RenderStyleConstants.h"
#include <wtf/EnumTraits.h>
#include <wtf/FixedVector.h>
namespace WebCore {
class CSSSelectorList;
struct CSSSelectorParserContext;
struct PossiblyQuotedIdentifier {
AtomString identifier;
bool wasQuoted { false };
bool isNull() const { return identifier.isNull(); }
};
enum class SelectorSpecificityIncrement {
ClassA = 0x10000,
ClassB = 0x100,
ClassC = 1
};
// Selector for a StyleRule.
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER(CSSSelectorRareData);
class CSSSelector {
WTF_MAKE_FAST_ALLOCATED;
public:
CSSSelector() = default;
CSSSelector(const CSSSelector&);
explicit CSSSelector(const QualifiedName&, bool tagIsForNamespaceRule = false);
~CSSSelector();
// Re-create selector text from selector's data.
String selectorText(StringView separator = { }, StringView rightSide = { }) const;
unsigned computeSpecificity() const;
std::array<uint8_t, 3> computeSpecificityTuple() const;
unsigned specificityForPage() const;
bool visitAllSimpleSelectors(auto& apply) const;
bool hasExplicitNestingParent() const;
bool hasExplicitPseudoClassScope() const;
void resolveNestingParentSelectors(const CSSSelectorList& parent);
void replaceNestingParentByPseudoClassScope();
using PseudoClass = CSSSelectorPseudoClass;
using PseudoElement = CSSSelectorPseudoElement;
// How the attribute value has to match. Default is Exact.
enum class Match : uint8_t {
Unknown = 0,
Tag,
Id,
Class,
Exact,
Set,
List,
Hyphen,
PseudoClass,
PseudoElement,
Contain, // css3: E[foo*="bar"]
Begin, // css3: E[foo^="bar"]
End, // css3: E[foo$="bar"]
PagePseudoClass,
NestingParent, // &
HasScope, // matches the :has() scope
ForgivingUnknown,
ForgivingUnknownNestContaining
};
enum class Relation : uint8_t {
Subselector,
DescendantSpace,
Child,
DirectAdjacent,
IndirectAdjacent,
ShadowDescendant,
ShadowPartDescendant,
ShadowSlotted
};
enum class PagePseudoClass : uint8_t {
First,
Left,
Right,
};
enum AttributeMatchType { CaseSensitive, CaseInsensitive };
static PseudoId pseudoId(PseudoElement);
static bool isPseudoClassEnabled(PseudoClass, const CSSSelectorParserContext&);
static bool isPseudoElementEnabled(PseudoElement, StringView, const CSSSelectorParserContext&);
static std::optional<PseudoElement> parsePseudoElementName(StringView, const CSSSelectorParserContext&);
static bool pseudoClassRequiresArgument(PseudoClass);
static bool pseudoElementRequiresArgument(PseudoElement);
static bool pseudoClassMayHaveArgument(PseudoClass);
static bool pseudoElementMayHaveArgument(PseudoElement);
static const ASCIILiteral selectorTextForPseudoClass(PseudoClass);
static const ASCIILiteral nameForUserAgentPartLegacyAlias(StringView);
// Selectors are kept in an array by CSSSelectorList.
// The next component of the selector is the next item in the array.
const CSSSelector* tagHistory() const { return m_isLastInTagHistory ? nullptr : this + 1; }
const CSSSelector* firstInCompound() const;
const QualifiedName& tagQName() const;
const AtomString& tagLowercaseLocalName() const;
const AtomString& value() const;
const AtomString& serializingValue() const;
const QualifiedName& attribute() const;
const AtomString& argument() const { return m_hasRareData ? m_data.rareData->argument : nullAtom(); }
bool attributeValueMatchingIsCaseInsensitive() const;
const FixedVector<PossiblyQuotedIdentifier>* argumentList() const { return m_hasRareData ? &m_data.rareData->argumentList : nullptr; }
const CSSSelectorList* selectorList() const { return m_hasRareData ? m_data.rareData->selectorList.get() : nullptr; }
CSSSelectorList* selectorList() { return m_hasRareData ? m_data.rareData->selectorList.get() : nullptr; }
bool matchNth(int count) const;
int nthA() const;
int nthB() const;
bool hasDescendantRelation() const { return relation() == Relation::DescendantSpace; }
bool hasDescendantOrChildRelation() const { return relation() == Relation::Child || hasDescendantRelation(); }
PseudoClass pseudoClass() const;
PseudoElement pseudoElement() const;
PagePseudoClass pagePseudoClass() const;
bool matchesPseudoElement() const;
bool isSiblingSelector() const;
bool isAttributeSelector() const;
Relation relation() const { return static_cast<Relation>(m_relation); }
Match match() const { return static_cast<Match>(m_match); }
bool isLastInSelectorList() const { return m_isLastInSelectorList; }
bool isFirstInTagHistory() const { return m_isFirstInTagHistory; }
bool isLastInTagHistory() const { return m_isLastInTagHistory; }
// FIXME: These should ideally be private, but CSSSelectorList and StyleRule use them.
void setLastInSelectorList() { m_isLastInSelectorList = true; }
void setNotFirstInTagHistory() { m_isFirstInTagHistory = false; }
void setNotLastInTagHistory() { m_isLastInTagHistory = false; }
bool isForPage() const { return m_isForPage; }
// Implicit means that this selector is not author/UA written.
bool isImplicit() const { return m_isImplicit; }
private:
friend class MutableCSSSelector;
void setValue(const AtomString&, bool matchLowerCase = false);
void setAttribute(const QualifiedName&, AttributeMatchType);
void setNth(int a, int b);
void setArgument(const AtomString&);
void setArgumentList(FixedVector<PossiblyQuotedIdentifier>);
void setSelectorList(std::unique_ptr<CSSSelectorList>);
void setPseudoClass(PseudoClass);
void setPseudoElement(PseudoElement);
void setPagePseudoClass(PagePseudoClass);
void setRelation(Relation);
void setMatch(Match);
void setForPage() { m_isForPage = true; }
void setImplicit() { m_isImplicit = true; }
unsigned simpleSelectorSpecificityForPage() const;
CSSSelector* tagHistory() { return m_isLastInTagHistory ? nullptr : this + 1; }
unsigned m_relation : 4 { enumToUnderlyingType(Relation::DescendantSpace) };
mutable unsigned m_match : 5 { enumToUnderlyingType(Match::Unknown) };
mutable unsigned m_pseudoType : 8 { 0 }; // PseudoType.
// 17 bits
unsigned m_isLastInSelectorList : 1 { false };
unsigned m_isFirstInTagHistory : 1 { true };
unsigned m_isLastInTagHistory : 1 { true };
unsigned m_hasRareData : 1 { false };
unsigned m_isForPage : 1 { false };
unsigned m_tagIsForNamespaceRule : 1 { false };
unsigned m_caseInsensitiveAttributeValueMatching : 1 { false };
unsigned m_isImplicit : 1 { false };
// 25 bits
#if !ASSERT_WITH_SECURITY_IMPLICATION_DISABLED
unsigned m_destructorHasBeenCalled : 1 { false };
#endif
CSSSelector& operator=(const CSSSelector&) = delete;
CSSSelector(CSSSelector&&) = delete;
struct RareData : public RefCounted<RareData> {
WTF_MAKE_STRUCT_FAST_ALLOCATED_WITH_HEAP_IDENTIFIER(CSSSelectorRareData);
static Ref<RareData> create(AtomString);
WEBCORE_EXPORT ~RareData();
bool matchNth(int count);
// For quirks mode, class and id are case-insensitive. In the case where uppercase
// letters are used in quirks mode, |m_matchingValue| holds the lowercase class/id
// and |m_serializingValue| holds the original string.
AtomString matchingValue;
AtomString serializingValue;
int a { 0 }; // Used for :nth-*
int b { 0 }; // Used for :nth-*
QualifiedName attribute; // used for attribute selector
AtomString argument; // Used for :contains and :nth-*
FixedVector<PossiblyQuotedIdentifier> argumentList; // Used for :lang and ::part arguments.
std::unique_ptr<CSSSelectorList> selectorList; // Used for :is(), :matches(), and :not().
Ref<RareData> deepCopy() const;
private:
RareData(AtomString&& value);
RareData(const RareData& other);
};
void createRareData();
union DataUnion {
AtomStringImpl* value { nullptr };
QualifiedName::QualifiedNameImpl* tagQName;
RareData* rareData;
} m_data;
};
inline bool operator==(const AtomString& a, const PossiblyQuotedIdentifier& b) { return a == b.identifier; }
inline bool operator==(const PossiblyQuotedIdentifier& a, const AtomString& b) { return a.identifier == b; }
inline const QualifiedName& CSSSelector::attribute() const
{
ASSERT(isAttributeSelector());
ASSERT(m_hasRareData);
return m_data.rareData->attribute;
}
inline bool CSSSelector::matchesPseudoElement() const
{
return match() == Match::PseudoElement;
}
static inline bool pseudoClassIsRelativeToSiblings(CSSSelector::PseudoClass type)
{
return type == CSSSelector::PseudoClass::Empty
|| type == CSSSelector::PseudoClass::FirstChild
|| type == CSSSelector::PseudoClass::FirstOfType
|| type == CSSSelector::PseudoClass::LastChild
|| type == CSSSelector::PseudoClass::LastOfType
|| type == CSSSelector::PseudoClass::OnlyChild
|| type == CSSSelector::PseudoClass::OnlyOfType
|| type == CSSSelector::PseudoClass::NthChild
|| type == CSSSelector::PseudoClass::NthOfType
|| type == CSSSelector::PseudoClass::NthLastChild
|| type == CSSSelector::PseudoClass::NthLastOfType;
}
static inline bool isTreeStructuralPseudoClass(CSSSelector::PseudoClass type)
{
return pseudoClassIsRelativeToSiblings(type) || type == CSSSelector::PseudoClass::Root;
}
inline bool isLogicalCombinationPseudoClass(CSSSelector::PseudoClass pseudoClass)
{
switch (pseudoClass) {
case CSSSelector::PseudoClass::Is:
case CSSSelector::PseudoClass::Where:
case CSSSelector::PseudoClass::WebKitAny:
case CSSSelector::PseudoClass::Not:
case CSSSelector::PseudoClass::Has:
return true;
default:
return false;
}
}
inline bool CSSSelector::isSiblingSelector() const
{
return relation() == Relation::DirectAdjacent
|| relation() == Relation::IndirectAdjacent
|| (match() == CSSSelector::Match::PseudoClass && pseudoClassIsRelativeToSiblings(pseudoClass()));
}
inline bool CSSSelector::isAttributeSelector() const
{
return match() == CSSSelector::Match::Exact
|| match() == CSSSelector::Match::Set
|| match() == CSSSelector::Match::List
|| match() == CSSSelector::Match::Hyphen
|| match() == CSSSelector::Match::Contain
|| match() == CSSSelector::Match::Begin
|| match() == CSSSelector::Match::End;
}
inline void CSSSelector::setValue(const AtomString& value, bool matchLowerCase)
{
ASSERT(match() != Match::Tag);
auto matchingValue = matchLowerCase ? value.convertToASCIILowercase() : value;
if (!m_hasRareData && matchingValue != value)
createRareData();
// Need to do ref counting manually for the union.
if (!m_hasRareData) {
if (m_data.value)
m_data.value->deref();
m_data.value = value.impl();
m_data.value->ref();
return;
}
m_data.rareData->matchingValue = WTFMove(matchingValue);
m_data.rareData->serializingValue = value;
}
inline CSSSelector::~CSSSelector()
{
ASSERT_WITH_SECURITY_IMPLICATION(!m_destructorHasBeenCalled);
#if !ASSERT_WITH_SECURITY_IMPLICATION_DISABLED
m_destructorHasBeenCalled = true;
#endif
if (m_hasRareData) {
m_data.rareData->deref();
m_data.rareData = nullptr;
m_hasRareData = false;
} else if (match() == Match::Tag) {
m_data.tagQName->deref();
m_data.tagQName = nullptr;
m_match = enumToUnderlyingType(Match::Unknown);
} else if (m_data.value) {
m_data.value->deref();
m_data.value = nullptr;
}
}
inline const QualifiedName& CSSSelector::tagQName() const
{
return *reinterpret_cast<const QualifiedName*>(&m_data.tagQName);
}
inline const AtomString& CSSSelector::tagLowercaseLocalName() const
{
return tagQName().localNameLowercase();
}
inline const AtomString& CSSSelector::value() const
{
ASSERT(match() != Match::Tag);
if (m_hasRareData)
return m_data.rareData->matchingValue;
// AtomString is really just an AtomStringImpl* so the cast below is safe.
return *reinterpret_cast<const AtomString*>(&m_data.value);
}
inline const AtomString& CSSSelector::serializingValue() const
{
ASSERT(match() != Match::Tag);
if (m_hasRareData)
return m_data.rareData->serializingValue;
// AtomString is really just an AtomStringImpl* so the cast below is safe.
return *reinterpret_cast<const AtomString*>(&m_data.value);
}
inline bool CSSSelector::attributeValueMatchingIsCaseInsensitive() const
{
return m_caseInsensitiveAttributeValueMatching;
}
inline auto CSSSelector::pseudoClass() const -> PseudoClass
{
ASSERT(match() == Match::PseudoClass);
return static_cast<PseudoClass>(m_pseudoType);
}
inline void CSSSelector::setPseudoClass(PseudoClass pseudoClass)
{
m_pseudoType = enumToUnderlyingType(pseudoClass);
ASSERT(static_cast<PseudoClass>(m_pseudoType) == pseudoClass);
}
inline auto CSSSelector::pseudoElement() const -> PseudoElement
{
ASSERT(match() == Match::PseudoElement);
return static_cast<PseudoElement>(m_pseudoType);
}
inline void CSSSelector::setPseudoElement(PseudoElement pseudoElement)
{
m_pseudoType = enumToUnderlyingType(pseudoElement);
ASSERT(static_cast<PseudoElement>(m_pseudoType) == pseudoElement);
}
inline auto CSSSelector::pagePseudoClass() const -> PagePseudoClass
{
ASSERT(match() == Match::PagePseudoClass);
return static_cast<PagePseudoClass>(m_pseudoType);
}
inline void CSSSelector::setPagePseudoClass(PagePseudoClass pagePseudoClass)
{
m_pseudoType = enumToUnderlyingType(pagePseudoClass);
ASSERT(static_cast<PagePseudoClass>(m_pseudoType) == pagePseudoClass);
}
inline void CSSSelector::setRelation(Relation relation)
{
m_relation = enumToUnderlyingType(relation);
}
inline void CSSSelector::setMatch(Match match)
{
m_match = enumToUnderlyingType(match);
}
} // namespace WebCore