1 /*
2 * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #ifndef CSSParserValues_h
22 #define CSSParserValues_h
23
24 #include "core/CSSValueKeywords.h"
25 #include "core/css/CSSPrimitiveValue.h"
26 #include "core/css/CSSSelector.h"
27 #include "core/css/CSSValueList.h"
28 #include "wtf/text/AtomicString.h"
29 #include "wtf/text/WTFString.h"
30
31 namespace blink {
32
33 class QualifiedName;
34
35 struct CSSParserString {
initCSSParserString36 void init(const LChar* characters, unsigned length)
37 {
38 m_data.characters8 = characters;
39 m_length = length;
40 m_is8Bit = true;
41 }
42
initCSSParserString43 void init(const UChar* characters, unsigned length)
44 {
45 m_data.characters16 = characters;
46 m_length = length;
47 m_is8Bit = false;
48 }
49
initCSSParserString50 void init(const String& string)
51 {
52 init(string, 0, string.length());
53 }
54
initCSSParserString55 void init(const String& string, unsigned startOffset, unsigned length)
56 {
57 m_length = length;
58 if (!m_length) {
59 m_data.characters8 = 0;
60 m_is8Bit = true;
61 return;
62 }
63 if (string.is8Bit()) {
64 m_data.characters8 = const_cast<LChar*>(string.characters8()) + startOffset;
65 m_is8Bit = true;
66 } else {
67 m_data.characters16 = const_cast<UChar*>(string.characters16()) + startOffset;
68 m_is8Bit = false;
69 }
70 }
71
clearCSSParserString72 void clear()
73 {
74 m_data.characters8 = 0;
75 m_length = 0;
76 m_is8Bit = true;
77 }
78
is8BitCSSParserString79 bool is8Bit() const { return m_is8Bit; }
characters8CSSParserString80 const LChar* characters8() const { ASSERT(is8Bit()); return m_data.characters8; }
characters16CSSParserString81 const UChar* characters16() const { ASSERT(!is8Bit()); return m_data.characters16; }
82 template <typename CharacterType>
83 const CharacterType* characters() const;
84
lengthCSSParserString85 unsigned length() const { return m_length; }
setLengthCSSParserString86 void setLength(unsigned length) { m_length = length; }
87
88 UChar operator[](unsigned i) const
89 {
90 ASSERT_WITH_SECURITY_IMPLICATION(i < m_length);
91 if (is8Bit())
92 return m_data.characters8[i];
93 return m_data.characters16[i];
94 }
95
equalIgnoringCaseCSSParserString96 bool equalIgnoringCase(const char* str) const
97 {
98 bool match = is8Bit() ? WTF::equalIgnoringCase(str, characters8(), length()) : WTF::equalIgnoringCase(str, characters16(), length());
99 if (!match)
100 return false;
101 ASSERT(strlen(str) >= length());
102 return str[length()] == '\0';
103 }
104
105 template <size_t strLength>
startsWithIgnoringCaseCSSParserString106 bool startsWithIgnoringCase(const char (&str)[strLength]) const
107 {
108 return startsWithIgnoringCase(str, strLength - 1);
109 }
110
startsWithIgnoringCaseCSSParserString111 bool startsWithIgnoringCase(const char* str, size_t strLength) const
112 {
113 if (length() < strLength)
114 return false;
115 return is8Bit() ? WTF::equalIgnoringCase(str, characters8(), strLength) : WTF::equalIgnoringCase(str, characters16(), strLength);
116 }
117
StringCSSParserString118 operator String() const { return is8Bit() ? String(m_data.characters8, m_length) : StringImpl::create8BitIfPossible(m_data.characters16, m_length); }
AtomicStringCSSParserString119 operator AtomicString() const { return is8Bit() ? AtomicString(m_data.characters8, m_length) : AtomicString(m_data.characters16, m_length); }
120
isFunctionCSSParserString121 bool isFunction() const { return length() > 0 && (*this)[length() - 1] == '('; }
122
123 union {
124 const LChar* characters8;
125 const UChar* characters16;
126 } m_data;
127 unsigned m_length;
128 bool m_is8Bit;
129 };
130
131 template <>
132 inline const LChar* CSSParserString::characters<LChar>() const { return characters8(); }
133
134 template <>
135 inline const UChar* CSSParserString::characters<UChar>() const { return characters16(); }
136
137 struct CSSParserFunction;
138 class CSSParserValueList;
139
140 struct CSSParserValue {
141 CSSValueID id;
142 bool isInt;
143 union {
144 double fValue;
145 int iValue;
146 CSSParserString string;
147 CSSParserFunction* function;
148 CSSParserValueList* valueList;
149 };
150 enum {
151 Operator = 0x100000,
152 Function = 0x100001,
153 ValueList = 0x100002,
154 Q_EMS = 0x100003,
155 };
156 int unit;
157
158 inline void setFromNumber(double value, int unit = CSSPrimitiveValue::CSS_NUMBER);
159 inline void setFromFunction(CSSParserFunction*);
160 inline void setFromValueList(PassOwnPtr<CSSParserValueList>);
161 };
162
163 class CSSParserValueList {
164 WTF_MAKE_FAST_ALLOCATED;
165 public:
CSSParserValueList()166 CSSParserValueList()
167 : m_current(0)
168 {
169 }
170 ~CSSParserValueList();
171
172 void addValue(const CSSParserValue&);
173 void insertValueAt(unsigned, const CSSParserValue&);
174 void stealValues(CSSParserValueList&);
175
size()176 unsigned size() const { return m_values.size(); }
currentIndex()177 unsigned currentIndex() { return m_current; }
current()178 CSSParserValue* current() { return m_current < m_values.size() ? &m_values[m_current] : 0; }
next()179 CSSParserValue* next() { ++m_current; return current(); }
previous()180 CSSParserValue* previous()
181 {
182 if (!m_current)
183 return 0;
184 --m_current;
185 return current();
186 }
setCurrentIndex(unsigned index)187 void setCurrentIndex(unsigned index)
188 {
189 ASSERT(index < m_values.size());
190 if (index < m_values.size())
191 m_current = index;
192 }
193
valueAt(unsigned i)194 CSSParserValue* valueAt(unsigned i) { return i < m_values.size() ? &m_values[i] : 0; }
195
clearAndLeakValues()196 void clearAndLeakValues() { m_values.clear(); m_current = 0;}
197 void destroyAndClear();
198
199 private:
200 unsigned m_current;
201 Vector<CSSParserValue, 4> m_values;
202 };
203
204 struct CSSParserFunction {
205 WTF_MAKE_FAST_ALLOCATED;
206 public:
207 CSSParserString name;
208 OwnPtr<CSSParserValueList> args;
209 };
210
211 class CSSParserSelector {
212 WTF_MAKE_NONCOPYABLE(CSSParserSelector); WTF_MAKE_FAST_ALLOCATED;
213 public:
214 CSSParserSelector();
215 explicit CSSParserSelector(const QualifiedName&);
216 ~CSSParserSelector();
217
releaseSelector()218 PassOwnPtr<CSSSelector> releaseSelector() { return m_selector.release(); }
219
relation()220 CSSSelector::Relation relation() const { return m_selector->relation(); }
setValue(const AtomicString & value)221 void setValue(const AtomicString& value) { m_selector->setValue(value); }
setAttribute(const QualifiedName & value,CSSSelector::AttributeMatchType matchType)222 void setAttribute(const QualifiedName& value, CSSSelector::AttributeMatchType matchType) { m_selector->setAttribute(value, matchType); }
setArgument(const AtomicString & value)223 void setArgument(const AtomicString& value) { m_selector->setArgument(value); }
setMatch(CSSSelector::Match value)224 void setMatch(CSSSelector::Match value) { m_selector->setMatch(value); }
setRelation(CSSSelector::Relation value)225 void setRelation(CSSSelector::Relation value) { m_selector->setRelation(value); }
setForPage()226 void setForPage() { m_selector->setForPage(); }
setRelationIsAffectedByPseudoContent()227 void setRelationIsAffectedByPseudoContent() { m_selector->setRelationIsAffectedByPseudoContent(); }
relationIsAffectedByPseudoContent()228 bool relationIsAffectedByPseudoContent() const { return m_selector->relationIsAffectedByPseudoContent(); }
229
230 void adoptSelectorVector(Vector<OwnPtr<CSSParserSelector> >& selectorVector);
231
232 bool hasHostPseudoSelector() const;
isContentPseudoElement()233 bool isContentPseudoElement() const { return m_selector->isContentPseudoElement(); }
234
pseudoType()235 CSSSelector::PseudoType pseudoType() const { return m_selector->pseudoType(); }
isCustomPseudoElement()236 bool isCustomPseudoElement() const { return m_selector->isCustomPseudoElement(); }
crossesTreeScopes()237 bool crossesTreeScopes() const { return isCustomPseudoElement() || pseudoType() == CSSSelector::PseudoCue || pseudoType() == CSSSelector::PseudoShadow; }
238
239 bool isSimple() const;
240 bool hasShadowPseudo() const;
241
tagHistory()242 CSSParserSelector* tagHistory() const { return m_tagHistory.get(); }
setTagHistory(PassOwnPtr<CSSParserSelector> selector)243 void setTagHistory(PassOwnPtr<CSSParserSelector> selector) { m_tagHistory = selector; }
clearTagHistory()244 void clearTagHistory() { m_tagHistory.clear(); }
245 void insertTagHistory(CSSSelector::Relation before, PassOwnPtr<CSSParserSelector>, CSSSelector::Relation after);
246 void appendTagHistory(CSSSelector::Relation, PassOwnPtr<CSSParserSelector>);
247 void prependTagSelector(const QualifiedName&, bool tagIsForNamespaceRule = false);
248
249 private:
250 OwnPtr<CSSSelector> m_selector;
251 OwnPtr<CSSParserSelector> m_tagHistory;
252 };
253
hasShadowPseudo()254 inline bool CSSParserSelector::hasShadowPseudo() const
255 {
256 return m_selector->relation() == CSSSelector::ShadowPseudo;
257 }
258
setFromNumber(double value,int unit)259 inline void CSSParserValue::setFromNumber(double value, int unit)
260 {
261 id = CSSValueInvalid;
262 isInt = false;
263 if (std::isfinite(value))
264 fValue = value;
265 else
266 fValue = 0;
267 this->unit = unit;
268 }
269
setFromFunction(CSSParserFunction * function)270 inline void CSSParserValue::setFromFunction(CSSParserFunction* function)
271 {
272 id = CSSValueInvalid;
273 this->function = function;
274 unit = Function;
275 isInt = false;
276 }
277
setFromValueList(PassOwnPtr<CSSParserValueList> valueList)278 inline void CSSParserValue::setFromValueList(PassOwnPtr<CSSParserValueList> valueList)
279 {
280 id = CSSValueInvalid;
281 this->valueList = valueList.leakPtr();
282 unit = ValueList;
283 isInt = false;
284 }
285
286 }
287
288 #endif
289