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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "config.h"
#include "core/css/parser/CSSParserTokenRange.h"
#include "wtf/StaticConstructors.h"
namespace blink {
DEFINE_GLOBAL(CSSParserToken, staticEOFToken);
void CSSParserTokenRange::initStaticEOFToken()
{
new ((void*)&staticEOFToken) CSSParserToken(EOFToken);
}
CSSParserTokenRange CSSParserTokenRange::makeSubRange(const CSSParserToken* first, const CSSParserToken* last)
{
if (first == &staticEOFToken)
first = m_last;
if (last == &staticEOFToken)
last = m_last;
ASSERT(first <= last);
return CSSParserTokenRange(first, last);
}
CSSParserTokenRange CSSParserTokenRange::consumeBlock()
{
ASSERT(peek().blockType() == CSSParserToken::BlockStart);
const CSSParserToken* start = &peek() + 1;
unsigned nestingLevel = 0;
do {
const CSSParserToken& token = consume();
if (token.blockType() == CSSParserToken::BlockStart)
nestingLevel++;
else if (token.blockType() == CSSParserToken::BlockEnd)
nestingLevel--;
} while (nestingLevel && m_first < m_last);
if (nestingLevel)
return makeSubRange(start, m_first); // Ended at EOF
return makeSubRange(start, m_first - 1);
}
void CSSParserTokenRange::consumeComponentValue()
{
// FIXME: This is going to do multiple passes over large sections of a stylesheet.
// We should consider optimising this by precomputing where each block ends.
unsigned nestingLevel = 0;
do {
const CSSParserToken& token = consume();
if (token.blockType() == CSSParserToken::BlockStart)
nestingLevel++;
else if (token.blockType() == CSSParserToken::BlockEnd)
nestingLevel--;
} while (nestingLevel && m_first < m_last);
}
void CSSParserTokenRange::consumeWhitespaceAndComments()
{
while (peek().type() == WhitespaceToken || peek().type() == CommentToken)
++m_first;
}
} // namespace blink
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