UChar decodeNamedEntity(const char* name)
{
    HTMLEntitySearch search;
    while (*name) {
        search.advance(*name++);
        if (!search.isEntityPrefix())
            return 0;
    }
    search.advance(';');
    UChar32 entityValue = search.currentValue();
    if (U16_LENGTH(entityValue) != 1) {
        // Callers need to move off this API if the entity table has values
        // which do no fit in a 16 bit UChar!
        ASSERT_NOT_REACHED();
        return 0;
    }
    return static_cast<UChar>(entityValue);
}
Example #2
0
void XMLTreeBuilder::processHTMLEntity(const AtomicXMLToken& token)
{
    HTMLEntitySearch search;
    const AtomicString& name = token.name();
    for (size_t i = 0; i < name.length(); ++i) {
        search.advance(name[i]);
        if (!search.isEntityPrefix()) {
            m_parser->stopParsing();
            return;
        }
    }
    search.advance(';');
    UChar32 entityValue = search.currentValue();
    if (entityValue <= 0xFFFF)
       appendToText(reinterpret_cast<UChar*>(&entityValue), 1);
    else {
        UChar utf16Pair[2] = { U16_LEAD(entityValue), U16_TRAIL(entityValue) };
        appendToText(utf16Pair, 2);
    }
}
bool consumeHTMLEntity(SegmentedString& source, Vector<UChar, 16>& decodedEntity, bool& notEnoughCharacters, UChar additionalAllowedCharacter)
{
    ASSERT(!additionalAllowedCharacter || additionalAllowedCharacter == '"' || additionalAllowedCharacter == '\'' || additionalAllowedCharacter == '>');
    ASSERT(!notEnoughCharacters);
    ASSERT(decodedEntity.isEmpty());

    enum EntityState {
        Initial,
        Number,
        MaybeHexLowerCaseX,
        MaybeHexUpperCaseX,
        Hex,
        Decimal,
        Named
    };
    EntityState entityState = Initial;
    UChar32 result = 0;
    Vector<UChar, 10> consumedCharacters;

    while (!source.isEmpty()) {
        UChar cc = *source;
        switch (entityState) {
        case Initial: {
            if (cc == '\x09' || cc == '\x0A' || cc == '\x0C' || cc == ' ' || cc == '<' || cc == '&')
                return false;
            if (additionalAllowedCharacter && cc == additionalAllowedCharacter)
                return false;
            if (cc == '#') {
                entityState = Number;
                break;
            }
            if ((cc >= 'a' && cc <= 'z') || (cc >= 'A' && cc <= 'Z')) {
                entityState = Named;
                continue;
            }
            return false;
        }
        case Number: {
            if (cc == 'x') {
                entityState = MaybeHexLowerCaseX;
                break;
            }
            if (cc == 'X') {
                entityState = MaybeHexUpperCaseX;
                break;
            }
            if (cc >= '0' && cc <= '9') {
                entityState = Decimal;
                continue;
            }
            source.push('#');
            return false;
        }
        case MaybeHexLowerCaseX: {
            if (isHexDigit(cc)) {
                entityState = Hex;
                continue;
            }
            source.push('#');
            source.push('x');
            return false;
        }
        case MaybeHexUpperCaseX: {
            if (isHexDigit(cc)) {
                entityState = Hex;
                continue;
            }
            source.push('#');
            source.push('X');
            return false;
        }
        case Hex: {
            if (cc >= '0' && cc <= '9')
                result = result * 16 + cc - '0';
            else if (cc >= 'a' && cc <= 'f')
                result = result * 16 + 10 + cc - 'a';
            else if (cc >= 'A' && cc <= 'F')
                result = result * 16 + 10 + cc - 'A';
            else {
                if (cc == ';')
                    source.advanceAndASSERT(cc);
                return convertToUTF16(legalEntityFor(result), decodedEntity);
            }
            break;
        }
        case Decimal: {
            if (cc >= '0' && cc <= '9')
                result = result * 10 + cc - '0';
            else {
                if (cc == ';')
                    source.advanceAndASSERT(cc);
                return convertToUTF16(legalEntityFor(result), decodedEntity);
            }
            break;
        }
        case Named: {
            HTMLEntitySearch entitySearch;
            while (!source.isEmpty()) {
                cc = *source;
                entitySearch.advance(cc);
                if (!entitySearch.isEntityPrefix())
                    break;
                consumedCharacters.append(cc);
                source.advanceAndASSERT(cc);
            }
            notEnoughCharacters = source.isEmpty();
            if (notEnoughCharacters) {
                // We can't an entity because there might be a longer entity
                // that we could match if we had more data.
                unconsumeCharacters(source, consumedCharacters);
                return false;
            }
            if (!entitySearch.mostRecentMatch()) {
                ASSERT(!entitySearch.currentValue());
                unconsumeCharacters(source, consumedCharacters);
                return false;
            }
            if (entitySearch.mostRecentMatch()->length != entitySearch.currentLength()) {
                // We've consumed too many characters.  We need to walk the
                // source back to the point at which we had consumed an
                // actual entity.
                unconsumeCharacters(source, consumedCharacters);
                consumedCharacters.clear();
                const int length = entitySearch.mostRecentMatch()->length;
                const UChar* reference = entitySearch.mostRecentMatch()->entity;
                for (int i = 0; i < length; ++i) {
                    cc = *source;
                    ASSERT_UNUSED(reference, cc == *reference++);
                    consumedCharacters.append(cc);
                    source.advanceAndASSERT(cc);
                    ASSERT(!source.isEmpty());
                }
                cc = *source;
            }
            if (entitySearch.mostRecentMatch()->lastCharacter() == ';'
                || !additionalAllowedCharacter
                || !(isAlphaNumeric(cc) || cc == '=')) {
                return convertToUTF16(entitySearch.mostRecentMatch()->value, decodedEntity);
            }
            unconsumeCharacters(source, consumedCharacters);
            return false;
        }
        }
        consumedCharacters.append(cc);
        source.advanceAndASSERT(cc);
    }
    ASSERT(source.isEmpty());
    notEnoughCharacters = true;
    unconsumeCharacters(source, consumedCharacters);
    return false;
}