cssselector.cpp

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        m_pseudoType = PseudoScrollbar;
    } else if (m_value == scrollbarButton) {
        element = true;
        m_pseudoType = PseudoScrollbarButton;
    } else if (m_value == scrollbarCorner) {
        element = true;
        m_pseudoType = PseudoScrollbarCorner;
    } else if (m_value == scrollbarThumb) {
        element = true;
        m_pseudoType = PseudoScrollbarThumb;
    } else if (m_value == scrollbarTrack) {
        element = true;
        m_pseudoType = PseudoScrollbarTrack;
    } else if (m_value == scrollbarTrackPiece) {
        element = true;
        m_pseudoType = PseudoScrollbarTrackPiece;
    } else if (m_value == cornerPresent)
         m_pseudoType = PseudoCornerPresent;
    else if (m_value == searchCancelButton) {
        m_pseudoType = PseudoSearchCancelButton;
        element = true;
    } else if (m_value == searchDecoration) {
        m_pseudoType = PseudoSearchDecoration;
        element = true;
    } else if (m_value == searchResultsDecoration) {
        m_pseudoType = PseudoSearchResultsDecoration;
        element = true;
    } else if (m_value == searchResultsButton) {
        m_pseudoType = PseudoSearchResultsButton;
        element = true;
    }  else if (m_value == selection) {
        m_pseudoType = PseudoSelection;
        element = true;
    } else if (m_value == sliderThumb) {
        m_pseudoType = PseudoSliderThumb;
        element = true;
    } else if (m_value == target)
        m_pseudoType = PseudoTarget;
    else if (m_value == visited)
        m_pseudoType = PseudoVisited;

    if (m_match == PseudoClass && element) {
        if (!compat) 
            m_pseudoType = PseudoUnknown;
        else 
           m_match = PseudoElement;
    } else if (m_match == PseudoElement && !element)
        m_pseudoType = PseudoUnknown;
}

bool CSSSelector::operator==(const CSSSelector& other)
{
    const CSSSelector* sel1 = this;
    const CSSSelector* sel2 = &other;

    while (sel1 && sel2) {
        if (sel1->m_tag != sel2->m_tag || sel1->attribute() != sel2->attribute() ||
             sel1->relation() != sel2->relation() || sel1->m_match != sel2->m_match ||
             sel1->m_value != sel2->m_value ||
             sel1->pseudoType() != sel2->pseudoType() ||
             sel1->argument() != sel2->argument())
            return false;
        sel1 = sel1->tagHistory();
        sel2 = sel2->tagHistory();
    }

    if (sel1 || sel2)
        return false;

    return true;
}

String CSSSelector::selectorText() const
{
    String str = "";

    const AtomicString& prefix = m_tag.prefix();
    const AtomicString& localName = m_tag.localName();
    if (m_match == CSSSelector::None || !prefix.isNull() || localName != starAtom) {
        if (prefix.isNull())
            str = localName;
        else
            str = prefix + "|" + localName;
    }

    const CSSSelector* cs = this;
    while (true) {
        if (cs->m_match == CSSSelector::Id) {
            str += "#";
            str += cs->m_value;
        } else if (cs->m_match == CSSSelector::Class) {
            str += ".";
            str += cs->m_value;
        } else if (cs->m_match == CSSSelector::PseudoClass) {
            str += ":";
            str += cs->m_value;
            if (cs->pseudoType() == PseudoNot) {
                if (CSSSelector* subSel = cs->simpleSelector())
                    str += subSel->selectorText();
                str += ")";
            } else if (cs->pseudoType() == PseudoLang
                    || cs->pseudoType() == PseudoNthChild
                    || cs->pseudoType() == PseudoNthLastChild
                    || cs->pseudoType() == PseudoNthOfType
                    || cs->pseudoType() == PseudoNthLastOfType) {
                str += cs->argument();
                str += ")";
            }
        } else if (cs->m_match == CSSSelector::PseudoElement) {
            str += "::";
            str += cs->m_value;
        } else if (cs->hasAttribute()) {
            str += "[";
            const AtomicString& prefix = cs->attribute().prefix();
            if (!prefix.isNull())
                str += prefix + "|";
            str += cs->attribute().localName();
            switch (cs->m_match) {
                case CSSSelector::Exact:
                    str += "=";
                    break;
                case CSSSelector::Set:
                    // set has no operator or value, just the attrName
                    str += "]";
                    break;
                case CSSSelector::List:
                    str += "~=";
                    break;
                case CSSSelector::Hyphen:
                    str += "|=";
                    break;
                case CSSSelector::Begin:
                    str += "^=";
                    break;
                case CSSSelector::End:
                    str += "$=";
                    break;
                case CSSSelector::Contain:
                    str += "*=";
                    break;
                default:
                    break;
            }
            if (cs->m_match != CSSSelector::Set) {
                str += "\"";
                str += cs->m_value;
                str += "\"]";
            }
        }
        if (cs->relation() != CSSSelector::SubSelector || !cs->tagHistory())
            break;
        cs = cs->tagHistory();
    }

    if (CSSSelector* tagHistory = cs->tagHistory()) {
        String tagHistoryText = tagHistory->selectorText();
        if (cs->relation() == CSSSelector::DirectAdjacent)
            str = tagHistoryText + " + " + str;
        else if (cs->relation() == CSSSelector::IndirectAdjacent)
            str = tagHistoryText + " ~ " + str;
        else if (cs->relation() == CSSSelector::Child)
            str = tagHistoryText + " > " + str;
        else
            // Descendant
            str = tagHistoryText + " " + str;
    }

    return str;
}
    
void CSSSelector::setTagHistory(CSSSelector* tagHistory) 
{ 
    if (m_hasRareData) 
        m_data.m_rareData->m_tagHistory.set(tagHistory); 
    else 
        m_data.m_tagHistory = tagHistory; 
}

const QualifiedName& CSSSelector::attribute() const
{ 
    switch (m_match) {
    case Id:
        return idAttr;
    case Class:
        return classAttr;
    default:
        return m_hasRareData ? m_data.m_rareData->m_attribute : anyQName();
    }
}

void CSSSelector::setAttribute(const QualifiedName& value) 
{ 
    createRareData(); 
    m_data.m_rareData->m_attribute = value; 
}
    
void CSSSelector::setArgument(const AtomicString& value) 
{ 
    createRareData(); 
    m_data.m_rareData->m_argument = value; 
}

void CSSSelector::setSimpleSelector(CSSSelector* value)
{
    createRareData(); 
    m_data.m_rareData->m_simpleSelector.set(value); 
}

bool CSSSelector::parseNth()
{
    if (!m_hasRareData)
        return false;
    if (m_parsedNth)
        return true;
    m_parsedNth = m_data.m_rareData->parseNth();
    return m_parsedNth;
}

bool CSSSelector::matchNth(int count)
{
    ASSERT(m_hasRareData);
    return m_data.m_rareData->matchNth(count);
}

// a helper function for parsing nth-arguments
bool CSSSelector::RareData::parseNth()
{    
    const String& argument = m_argument;
    
    if (argument.isEmpty())
        return false;
    
    m_a = 0;
    m_b = 0;
    if (argument == "odd") {
        m_a = 2;
        m_b = 1;
    } else if (argument == "even") {
        m_a = 2;
        m_b = 0;
    } else {
        int n = argument.find('n');
        if (n != -1) {
            if (argument[0] == '-') {
                if (n == 1)
                    m_a = -1; // -n == -1n
                else
                    m_a = argument.substring(0, n).toInt();
            } else if (!n)
                m_a = 1; // n == 1n
            else
                m_a = argument.substring(0, n).toInt();
            
            int p = argument.find('+', n);
            if (p != -1)
                m_b = argument.substring(p + 1, argument.length() - p - 1).toInt();
            else {
                p = argument.find('-', n);
                m_b = -argument.substring(p + 1, argument.length() - p - 1).toInt();
            }
        } else
            m_b = argument.toInt();
    }
    return true;
}

// a helper function for checking nth-arguments
bool CSSSelector::RareData::matchNth(int count)
{
    if (!m_a)
        return count == m_b;
    else if (m_a > 0) {
        if (count < m_b)
            return false;
        return (count - m_b) % m_a == 0;
    } else {
        if (count > m_b)
            return false;
        return (m_b - count) % (-m_a) == 0;
    }
}
    
} // namespace WebCore