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      1 /*
      2  * Copyright (C) 2003 Lars Knoll (knoll (at) 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 {
     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 
    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:
    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 
    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 
    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 
    250 private:
    251     OwnPtr<CSSSelector> m_selector;
    252     OwnPtr<CSSParserSelector> m_tagHistory;
    253     CSSParserSelector* m_functionArgumentSelector;
    254 };
    255 
    256 inline bool CSSParserSelector::hasShadowPseudo() const
    257 {
    258     return m_selector->relation() == CSSSelector::ShadowPseudo;
    259 }
    260 
    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 
    272 inline void CSSParserValue::setFromFunction(CSSParserFunction* function)
    273 {
    274     id = CSSValueInvalid;
    275     this->function = function;
    276     unit = Function;
    277 }
    278 
    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