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
31namespace WebCore {
32
33class CSSValue;
34class QualifiedName;
35
36struct CSSParserString {
37    void init(const LChar* characters, unsigned length)
38    {
39        m_data.characters8 = characters;
40        m_length = length;
41        m_is8Bit = true;
42    }
43
44    void init(const UChar* characters, unsigned length)
45    {
46        m_data.characters16 = characters;
47        m_length = length;
48        m_is8Bit = false;
49    }
50
51    void init(const String& string)
52    {
53        init(string, 0, string.length());
54    }
55
56    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
73    void clear()
74    {
75        m_data.characters8 = 0;
76        m_length = 0;
77        m_is8Bit = true;
78    }
79
80    void trimTrailingWhitespace();
81
82    bool is8Bit() const { return m_is8Bit; }
83    const LChar* characters8() const { ASSERT(is8Bit()); return m_data.characters8; }
84    const UChar* characters16() const { ASSERT(!is8Bit()); return m_data.characters16; }
85    template <typename CharacterType>
86    const CharacterType* characters() const;
87
88    unsigned length() const { return m_length; }
89    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
99    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>
107    bool startsWithIgnoringCase(const char (&str)[strLength]) const
108    {
109        return startsWithIgnoringCase(str, strLength - 1);
110    }
111
112    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
119    operator String() const { return is8Bit() ? String(m_data.characters8, m_length) : StringImpl::create8BitIfPossible(m_data.characters16, m_length); }
120    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
124    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
134template <>
135inline const LChar* CSSParserString::characters<LChar>() const { return characters8(); }
136
137template <>
138inline const UChar* CSSParserString::characters<UChar>() const { return characters16(); }
139
140struct CSSParserFunction;
141
142struct 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
167class CSSParserValueList {
168    WTF_MAKE_FAST_ALLOCATED;
169public:
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
181    unsigned size() const { return m_values.size(); }
182    unsigned currentIndex() { return m_current; }
183    CSSParserValue* current() { return m_current < m_values.size() ? &m_values[m_current] : 0; }
184    CSSParserValue* next() { ++m_current; return current(); }
185    CSSParserValue* previous()
186    {
187        if (!m_current)
188            return 0;
189        --m_current;
190        return current();
191    }
192
193    CSSParserValue* valueAt(unsigned i) { return i < m_values.size() ? &m_values[i] : 0; }
194
195    void clear() { m_values.clear(); }
196
197private:
198    unsigned m_current;
199    Vector<CSSParserValue, 4> m_values;
200};
201
202struct CSSParserFunction {
203    WTF_MAKE_FAST_ALLOCATED;
204public:
205    CSSParserString name;
206    OwnPtr<CSSParserValueList> args;
207};
208
209class CSSParserSelector {
210    WTF_MAKE_NONCOPYABLE(CSSParserSelector); WTF_MAKE_FAST_ALLOCATED;
211public:
212    CSSParserSelector();
213    explicit CSSParserSelector(const QualifiedName&);
214    ~CSSParserSelector();
215
216    PassOwnPtr<CSSSelector> releaseSelector() { return m_selector.release(); }
217
218    CSSSelector::Relation relation() const { return m_selector->relation(); }
219    void setValue(const AtomicString& value) { m_selector->setValue(value); }
220    void setAttribute(const QualifiedName& value) { m_selector->setAttribute(value); }
221    void setArgument(const AtomicString& value) { m_selector->setArgument(value); }
222    void setMatch(CSSSelector::Match value) { m_selector->m_match = value; }
223    void setRelation(CSSSelector::Relation value) { m_selector->m_relation = value; }
224    void setForPage() { m_selector->setForPage(); }
225    void setRelationIsAffectedByPseudoContent() { m_selector->setRelationIsAffectedByPseudoContent(); }
226    bool relationIsAffectedByPseudoContent() const { return m_selector->relationIsAffectedByPseudoContent(); }
227
228    void adoptSelectorVector(Vector<OwnPtr<CSSParserSelector> >& selectorVector);
229
230    CSSParserSelector* functionArgumentSelector() const { return m_functionArgumentSelector; }
231    void setFunctionArgumentSelector(CSSParserSelector* selector) { m_functionArgumentSelector = selector; }
232    bool isDistributedPseudoElement() const { return m_selector->isDistributedPseudoElement(); }
233    CSSParserSelector* findDistributedPseudoElementSelector() const;
234    bool isContentPseudoElement() const { return m_selector->isContentPseudoElement(); }
235
236    CSSSelector::PseudoType pseudoType() const { return m_selector->pseudoType(); }
237    bool isCustomPseudoElement() const { return m_selector->isCustomPseudoElement(); }
238    bool needsCrossingTreeScopeBoundary() const { return isCustomPseudoElement() || pseudoType() == CSSSelector::PseudoCue; }
239
240    bool isSimple() const;
241    bool hasShadowPseudo() const;
242
243    CSSParserSelector* tagHistory() const { return m_tagHistory.get(); }
244    void setTagHistory(PassOwnPtr<CSSParserSelector> selector) { m_tagHistory = selector; }
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
250private:
251    OwnPtr<CSSSelector> m_selector;
252    OwnPtr<CSSParserSelector> m_tagHistory;
253    CSSParserSelector* m_functionArgumentSelector;
254};
255
256inline bool CSSParserSelector::hasShadowPseudo() const
257{
258    return m_selector->relation() == CSSSelector::ShadowPseudo;
259}
260
261inline 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
272inline void CSSParserValue::setFromFunction(CSSParserFunction* function)
273{
274    id = CSSValueInvalid;
275    this->function = function;
276    unit = Function;
277}
278
279inline 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