File: CSSVariableData.cpp

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// Copyright 2015 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 Apple Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//    * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//    * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//    * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#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);

    m_tokens.shrinkToFit();
}

} // namespace WebCore