Source/WebCore/css/CSSVariableData.cpp

// Copyright 2015 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 Apple Inc. All rights reserved.
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#include "config.h"
#include "CSSVariableData.h"

#include "CSSCustomPropertyValue.h"
#include "CSSParserTokenRange.h"
#include "CSSValuePool.h"
#include "RenderStyle.h"
#include <wtf/text/AtomStringHash.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/StringView.h>

namespace WebCore {

template<typename CharacterType> void CSSVariableData::updateTokens(const CSSParserTokenRange& range)
{
    const CharacterType* currentOffset = m_backingString.characters<CharacterType>();
    for (const CSSParserToken& token : range) {
        if (token.hasStringBacking()) {
            unsigned length = token.value().length();
            StringView string(currentOffset, length);
            m_tokens.append(token.copyWithUpdatedString(string));
            currentOffset += length;
        } else
            m_tokens.append(token);
    }
    ASSERT(currentOffset == m_backingString.characters<CharacterType>() + m_backingString.length());
}

bool CSSVariableData::operator==(const CSSVariableData& other) const
{
    return tokens() == other.tokens();
}

CSSVariableData::CSSVariableData(const CSSParserTokenRange& range)
{
    StringBuilder stringBuilder;
    CSSParserTokenRange localRange = range;

    while (!localRange.atEnd()) {
        CSSParserToken token = localRange.consume();
        if (token.hasStringBacking())
            stringBuilder.append(token.value());
    }
    m_backingString = stringBuilder.toString();
    if (m_backingString.is8Bit())
        updateTokens<LChar>(range);
    else
        updateTokens<UChar>(range);
}

} // namespace WebCore