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 "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 WebCore {
32
33 class CSSValue;
34 class QualifiedName;
35
36 struct CSSParserString {
initCSSParserString37 void init(const LChar* characters, unsigned length)
38 {
39 m_data.characters8 = characters;
40 m_length = length;
41 m_is8Bit = true;
42 }
43
initCSSParserString44 void init(const UChar* characters, unsigned length)
45 {
46 m_data.characters16 = characters;
47 m_length = length;
48 m_is8Bit = false;
49 }
50
initCSSParserString51 void init(const String& string)
52 {
53 init(string, 0, string.length());
54 }
55
initCSSParserString56 void init(const String& string, unsigned startOffset, unsigned length)
57 {
58 m_length = length;
59 if (!m_length) {
60 m_data.characters8 = 0;
61 m_is8Bit = true;
62 return;
63 }
64 if (string.is8Bit()) {
65 m_data.characters8 = const_cast<LChar*>(string.characters8()) + startOffset;
66 m_is8Bit = true;
67 } else {
68 m_data.characters16 = const_cast<UChar*>(string.characters16()) + startOffset;
69 m_is8Bit = false;
70 }
71 }
72
clearCSSParserString73 void clear()
74 {
75 m_data.characters8 = 0;
76 m_length = 0;
77 m_is8Bit = true;
78 }
79
80 void trimTrailingWhitespace();
81
is8BitCSSParserString82 bool is8Bit() const { return m_is8Bit; }
characters8CSSParserString83 const LChar* characters8() const { ASSERT(is8Bit()); return m_data.characters8; }
characters16CSSParserString84 const UChar* characters16() const { ASSERT(!is8Bit()); return m_data.characters16; }
85 template <typename CharacterType>
86 const CharacterType* characters() const;
87
lengthCSSParserString88 unsigned length() const { return m_length; }
setLengthCSSParserString89 void setLength(unsigned length) { m_length = length; }
90
91 UChar operator[](unsigned i) const
92 {
93 ASSERT_WITH_SECURITY_IMPLICATION(i < m_length);
94 if (is8Bit())
95 return m_data.characters8[i];
96 return m_data.characters16[i];
97 }
98
equalIgnoringCaseCSSParserString99 bool equalIgnoringCase(const char* str) const
100 {
101 if (is8Bit())
102 return WTF::equalIgnoringCase(str, characters8(), length());
103 return WTF::equalIgnoringCase(str, characters16(), length());
104 }
105
106 template <size_t strLength>
startsWithIgnoringCaseCSSParserString107 bool startsWithIgnoringCase(const char (&str)[strLength]) const
108 {
109 return startsWithIgnoringCase(str, strLength - 1);
110 }
111
startsWithIgnoringCaseCSSParserString112 bool startsWithIgnoringCase(const char* str, size_t strLength) const
113 {
114 if (length() < strLength)
115 return false;
116 return is8Bit() ? WTF::equalIgnoringCase(str, characters8(), strLength) : WTF::equalIgnoringCase(str, characters16(), strLength);
117 }
118
StringCSSParserString119 operator String() const { return is8Bit() ? String(m_data.characters8, m_length) : StringImpl::create8BitIfPossible(m_data.characters16, m_length); }
AtomicStringCSSParserString120 operator AtomicString() const { return is8Bit() ? AtomicString(m_data.characters8, m_length) : AtomicString(m_data.characters16, m_length); }
121
122 AtomicString atomicSubstring(unsigned position, unsigned length) const;
123
isFunctionCSSParserString124 bool isFunction() const { return length() > 0 && (*this)[length() - 1] == '('; }
125
126 union {
127 const LChar* characters8;
128 const UChar* characters16;
129 } m_data;
130 unsigned m_length;
131 bool m_is8Bit;
132 };
133
134 template <>
135 inline const LChar* CSSParserString::characters<LChar>() const { return characters8(); }
136
137 template <>
138 inline const UChar* CSSParserString::characters<UChar>() const { return characters16(); }
139
140 struct CSSParserFunction;
141
142 struct CSSParserValue {
143 CSSValueID id;
144 bool isInt;
145 union {
146 double fValue;
147 int iValue;
148 CSSParserString string;
149 CSSParserFunction* function;
150 CSSParserValueList* valueList;
151 };
152 enum {
153 Operator = 0x100000,
154 Function = 0x100001,
155 ValueList = 0x100002,
156 Q_EMS = 0x100003,
157 };
158 int unit;
159
160 inline void setFromNumber(double value, int unit = CSSPrimitiveValue::CSS_NUMBER);
161 inline void setFromFunction(CSSParserFunction*);
162 inline void setFromValueList(PassOwnPtr<CSSParserValueList>);
163
164 PassRefPtr<CSSValue> createCSSValue();
165 };
166
167 class CSSParserValueList {
168 WTF_MAKE_FAST_ALLOCATED;
169 public:
CSSParserValueList()170 CSSParserValueList()
171 : m_current(0)
172 {
173 }
174 ~CSSParserValueList();
175
176 void addValue(const CSSParserValue&);
177 void insertValueAt(unsigned, const CSSParserValue&);
178 void deleteValueAt(unsigned);
179 void extend(CSSParserValueList&);
180
size()181 unsigned size() const { return m_values.size(); }
currentIndex()182 unsigned currentIndex() { return m_current; }
current()183 CSSParserValue* current() { return m_current < m_values.size() ? &m_values[m_current] : 0; }
next()184 CSSParserValue* next() { ++m_current; return current(); }
previous()185 CSSParserValue* previous()
186 {
187 if (!m_current)
188 return 0;
189 --m_current;
190 return current();
191 }
192
valueAt(unsigned i)193 CSSParserValue* valueAt(unsigned i) { return i < m_values.size() ? &m_values[i] : 0; }
194
clear()195 void clear() { m_values.clear(); }
196
197 private:
198 unsigned m_current;
199 Vector<CSSParserValue, 4> m_values;
200 };
201
202 struct CSSParserFunction {
203 WTF_MAKE_FAST_ALLOCATED;
204 public:
205 CSSParserString name;
206 OwnPtr<CSSParserValueList> args;
207 };
208
209 class CSSParserSelector {
210 WTF_MAKE_NONCOPYABLE(CSSParserSelector); WTF_MAKE_FAST_ALLOCATED;
211 public:
212 CSSParserSelector();
213 explicit CSSParserSelector(const QualifiedName&);
214 ~CSSParserSelector();
215
releaseSelector()216 PassOwnPtr<CSSSelector> releaseSelector() { return m_selector.release(); }
217
relation()218 CSSSelector::Relation relation() const { return m_selector->relation(); }
setValue(const AtomicString & value)219 void setValue(const AtomicString& value) { m_selector->setValue(value); }
setAttribute(const QualifiedName & value)220 void setAttribute(const QualifiedName& value) { m_selector->setAttribute(value); }
setArgument(const AtomicString & value)221 void setArgument(const AtomicString& value) { m_selector->setArgument(value); }
setMatch(CSSSelector::Match value)222 void setMatch(CSSSelector::Match value) { m_selector->m_match = value; }
setRelation(CSSSelector::Relation value)223 void setRelation(CSSSelector::Relation value) { m_selector->m_relation = value; }
setForPage()224 void setForPage() { m_selector->setForPage(); }
setRelationIsAffectedByPseudoContent()225 void setRelationIsAffectedByPseudoContent() { m_selector->setRelationIsAffectedByPseudoContent(); }
relationIsAffectedByPseudoContent()226 bool relationIsAffectedByPseudoContent() const { return m_selector->relationIsAffectedByPseudoContent(); }
227
228 void adoptSelectorVector(Vector<OwnPtr<CSSParserSelector> >& selectorVector);
229
functionArgumentSelector()230 CSSParserSelector* functionArgumentSelector() const { return m_functionArgumentSelector; }
setFunctionArgumentSelector(CSSParserSelector * selector)231 void setFunctionArgumentSelector(CSSParserSelector* selector) { m_functionArgumentSelector = selector; }
isDistributedPseudoElement()232 bool isDistributedPseudoElement() const { return m_selector->isDistributedPseudoElement(); }
233 CSSParserSelector* findDistributedPseudoElementSelector() const;
isContentPseudoElement()234 bool isContentPseudoElement() const { return m_selector->isContentPseudoElement(); }
235
pseudoType()236 CSSSelector::PseudoType pseudoType() const { return m_selector->pseudoType(); }
isCustomPseudoElement()237 bool isCustomPseudoElement() const { return m_selector->isCustomPseudoElement(); }
needsCrossingTreeScopeBoundary()238 bool needsCrossingTreeScopeBoundary() const { return isCustomPseudoElement() || pseudoType() == CSSSelector::PseudoCue; }
239
240 bool isSimple() const;
241 bool hasShadowPseudo() const;
242
tagHistory()243 CSSParserSelector* tagHistory() const { return m_tagHistory.get(); }
setTagHistory(PassOwnPtr<CSSParserSelector> selector)244 void setTagHistory(PassOwnPtr<CSSParserSelector> selector) { m_tagHistory = selector; }
clearTagHistory()245 void clearTagHistory() { m_tagHistory.clear(); }
246 void insertTagHistory(CSSSelector::Relation before, PassOwnPtr<CSSParserSelector>, CSSSelector::Relation after);
247 void appendTagHistory(CSSSelector::Relation, PassOwnPtr<CSSParserSelector>);
248 void prependTagSelector(const QualifiedName&, bool tagIsForNamespaceRule = false);
249
250 private:
251 OwnPtr<CSSSelector> m_selector;
252 OwnPtr<CSSParserSelector> m_tagHistory;
253 CSSParserSelector* m_functionArgumentSelector;
254 };
255
hasShadowPseudo()256 inline bool CSSParserSelector::hasShadowPseudo() const
257 {
258 return m_selector->relation() == CSSSelector::ShadowPseudo;
259 }
260
setFromNumber(double value,int unit)261 inline void CSSParserValue::setFromNumber(double value, int unit)
262 {
263 id = CSSValueInvalid;
264 isInt = false;
265 if (std::isfinite(value))
266 fValue = value;
267 else
268 fValue = 0;
269 this->unit = unit;
270 }
271
setFromFunction(CSSParserFunction * function)272 inline void CSSParserValue::setFromFunction(CSSParserFunction* function)
273 {
274 id = CSSValueInvalid;
275 this->function = function;
276 unit = Function;
277 }
278
setFromValueList(PassOwnPtr<CSSParserValueList> valueList)279 inline void CSSParserValue::setFromValueList(PassOwnPtr<CSSParserValueList> valueList)
280 {
281 id = CSSValueInvalid;
282 this->valueList = valueList.leakPtr();
283 unit = ValueList;
284 }
285
286 }
287
288 #endif
289