void CSSParserImpl::consumeDeclarationList(CSSParserTokenRange range, StyleRule::Type ruleType)
{
    ASSERT(m_parsedProperties.isEmpty());

    bool useObserver = m_observerWrapper && ruleType == StyleRule::Style;
    if (useObserver) {
        m_observerWrapper->observer().startRuleBody(m_observerWrapper->previousTokenStartOffset(range));
        m_observerWrapper->skipCommentsBefore(range, true);
    }

    while (!range.atEnd()) {
        switch (range.peek().type()) {
        case WhitespaceToken:
        case SemicolonToken:
            range.consume();
            break;
        case IdentToken: {
            const CSSParserToken* declarationStart = &range.peek();

            if (useObserver)
                m_observerWrapper->yieldCommentsBefore(range);

            while (!range.atEnd() && range.peek().type() != SemicolonToken)
                range.consumeComponentValue();

            consumeDeclaration(range.makeSubRange(declarationStart, &range.peek()), ruleType);

            if (useObserver)
                m_observerWrapper->skipCommentsBefore(range, false);
            break;
        }
        case AtKeywordToken: {
            RefPtrWillBeRawPtr<StyleRuleBase> rule = consumeAtRule(range, NoRules);
            ASSERT_UNUSED(rule, !rule);
            break;
        }
        default: // Parse error, unexpected token in declaration list
            while (!range.atEnd() && range.peek().type() != SemicolonToken)
                range.consumeComponentValue();
            break;
        }
    }

    // Yield remaining comments
    if (useObserver) {
        m_observerWrapper->yieldCommentsBefore(range);
        m_observerWrapper->observer().endRuleBody(m_observerWrapper->endOffset(range));
    }
}
bool SizesAttributeParser::parse(CSSParserTokenRange range)
{
    // Split on a comma token and parse the result tokens as (media-condition, length) pairs
    while (!range.atEnd()) {
        const CSSParserToken* mediaConditionStart = &range.peek();
        // The length is the last component value before the comma which isn't whitespace or a comment
        const CSSParserToken* lengthTokenStart = &range.peek();
        const CSSParserToken* lengthTokenEnd = &range.peek();
        while (!range.atEnd() && range.peek().type() != CommaToken) {
            lengthTokenStart = &range.peek();
            range.consumeComponentValue();
            lengthTokenEnd = &range.peek();
            range.consumeWhitespace();
        }
        range.consume();

        float length;
        if (!calculateLengthInPixels(range.makeSubRange(lengthTokenStart, lengthTokenEnd), length))
            continue;
        RefPtrWillBeRawPtr<MediaQuerySet> mediaCondition = MediaQueryParser::parseMediaCondition(range.makeSubRange(mediaConditionStart, lengthTokenStart));
        if (!mediaCondition || !mediaConditionMatches(mediaCondition))
            continue;
        m_length = length;
        m_lengthWasSet = true;
        return true;
    }
    return false;
}
PassRefPtrWillBeRawPtr<StyleRuleBase> CSSParserImpl::consumeAtRule(CSSParserTokenRange& range, AllowedRulesType allowedRules)
{
    ASSERT(range.peek().type() == AtKeywordToken);
    const CSSParserString& name = range.consume().value();
    const CSSParserToken* preludeStart = &range.peek();
    while (!range.atEnd() && range.peek().type() != LeftBraceToken && range.peek().type() != SemicolonToken)
        range.consumeComponentValue();

    CSSParserTokenRange prelude = range.makeSubRange(preludeStart, &range.peek());
    CSSAtRuleID id = cssAtRuleID(name);
    if (id != CSSAtRuleInvalid && m_context.useCounter())
        countAtRule(m_context.useCounter(), id);

    if (range.atEnd() || range.peek().type() == SemicolonToken) {
        range.consume();
        if (allowedRules == AllowCharsetRules && id == CSSAtRuleCharset)
            return consumeCharsetRule(prelude);
        if (allowedRules <= AllowImportRules && id == CSSAtRuleImport)
            return consumeImportRule(prelude);
        if (allowedRules <= AllowNamespaceRules && id == CSSAtRuleNamespace)
            return consumeNamespaceRule(prelude);
        return nullptr; // Parse error, unrecognised at-rule without block
    }

    CSSParserTokenRange block = range.consumeBlock();
    if (allowedRules == KeyframeRules)
        return nullptr; // Parse error, no at-rules supported inside @keyframes
    if (allowedRules == NoRules)
        return nullptr; // Parse error, no at-rules supported inside declaration lists

    ASSERT(allowedRules <= RegularRules);

    switch (id) {
    case CSSAtRuleMedia:
        return consumeMediaRule(prelude, block);
    case CSSAtRuleSupports:
        return consumeSupportsRule(prelude, block);
    case CSSAtRuleViewport:
        return consumeViewportRule(prelude, block);
    case CSSAtRuleFontFace:
        return consumeFontFaceRule(prelude, block);
    case CSSAtRuleWebkitKeyframes:
        return consumeKeyframesRule(true, prelude, block);
    case CSSAtRuleKeyframes:
        return consumeKeyframesRule(false, prelude, block);
    case CSSAtRulePage:
        return consumePageRule(prelude, block);
    default:
        return nullptr; // Parse error, unrecognised at-rule with block
    }
}
PassRefPtrWillBeRawPtr<StyleRuleBase> CSSParserImpl::consumeAtRule(CSSParserTokenRange& range, AllowedRulesType allowedRules)
{
    ASSERT(range.peek().type() == AtKeywordToken);
    const CSSParserString& name = range.consume().value();
    const CSSParserToken* preludeStart = &range.peek();
    while (!range.atEnd() && range.peek().type() != LeftBraceToken && range.peek().type() != SemicolonToken)
        range.consumeComponentValue();

    CSSParserTokenRange prelude = range.makeSubRange(preludeStart, &range.peek());

    if (range.atEnd() || range.peek().type() == SemicolonToken) {
        range.consume();
        if (allowedRules == AllowCharsetRules && name.equalIgnoringCase("charset"))
            return consumeCharsetRule(prelude);
        if (allowedRules <= AllowImportRules && name.equalIgnoringCase("import"))
            return consumeImportRule(prelude);
        if (allowedRules <= AllowNamespaceRules && name.equalIgnoringCase("namespace"))
            return consumeNamespaceRule(prelude);
        return nullptr; // Parse error, unrecognised at-rule without block
    }

    CSSParserTokenRange block = range.consumeBlock();
    if (allowedRules == KeyframeRules)
        return nullptr; // Parse error, no at-rules supported inside @keyframes
    if (allowedRules == NoRules)
        return nullptr; // Parse error, no at-rules supported inside declaration lists

    ASSERT(allowedRules <= RegularRules);

    if (name.equalIgnoringCase("media"))
        return consumeMediaRule(prelude, block);
    if (name.equalIgnoringCase("supports"))
        return consumeSupportsRule(prelude, block);
    if (name.equalIgnoringCase("viewport"))
        return consumeViewportRule(prelude, block);
    if (name.equalIgnoringCase("font-face"))
        return consumeFontFaceRule(prelude, block);
    if (name.equalIgnoringCase("-webkit-keyframes"))
        return consumeKeyframesRule(true, prelude, block);
    if (name.equalIgnoringCase("keyframes"))
        return consumeKeyframesRule(false, prelude, block);
    if (name.equalIgnoringCase("page"))
        return consumePageRule(prelude, block);
    return nullptr; // Parse error, unrecognised at-rule with block
}
Beispiel #5
0
CSSSupportsParser::SupportsResult
CSSSupportsParser::consumeConditionInParenthesis(CSSParserTokenRange& range) {
  if (range.peek().type() == FunctionToken) {
    range.consumeComponentValue();
    return Unsupported;
  }
  if (range.peek().type() != LeftParenthesisToken)
    return Invalid;
  CSSParserTokenRange innerRange = range.consumeBlock();
  innerRange.consumeWhitespace();
  SupportsResult result = consumeCondition(innerRange);
  if (result != Invalid)
    return result;
  return innerRange.peek().type() == IdentToken &&
                 m_parser.supportsDeclaration(innerRange)
             ? Supported
             : Unsupported;
}
static void observeSelectors(CSSParserObserverWrapper& wrapper, CSSParserTokenRange selectors)
{
    // This is easier than hooking into the CSSSelectorParser
    selectors.consumeWhitespace();
    CSSParserTokenRange originalRange = selectors;
    wrapper.observer().startRuleHeader(StyleRule::Style, wrapper.startOffset(originalRange));

    while (!selectors.atEnd()) {
        const CSSParserToken* selectorStart = &selectors.peek();
        while (!selectors.atEnd() && selectors.peek().type() != CommaToken)
            selectors.consumeComponentValue();
        CSSParserTokenRange selector = selectors.makeSubRange(selectorStart, &selectors.peek());
        selectors.consumeIncludingWhitespace();

        wrapper.observer().observeSelector(wrapper.startOffset(selector), wrapper.endOffset(selector));
    }

    wrapper.observer().endRuleHeader(wrapper.endOffset(originalRange));
}
PassRefPtrWillBeRawPtr<StyleRuleBase> CSSParserImpl::consumeQualifiedRule(CSSParserTokenRange& range, AllowedRulesType allowedRules)
{
    const CSSParserToken* preludeStart = &range.peek();
    while (!range.atEnd() && range.peek().type() != LeftBraceToken)
        range.consumeComponentValue();

    if (range.atEnd())
        return nullptr; // Parse error, EOF instead of qualified rule block

    CSSParserTokenRange prelude = range.makeSubRange(preludeStart, &range.peek());
    CSSParserTokenRange block = range.consumeBlock();

    if (allowedRules <= RegularRules)
        return consumeStyleRule(prelude, block);
    if (allowedRules == KeyframeRules)
        return consumeKeyframeStyleRule(prelude, block);

    ASSERT_NOT_REACHED();
    return nullptr;
}