// Copyright 2015 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 Apple Inc. All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
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// notice, this list of conditions and the following disclaimer.
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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 {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(CSSVariableData);

template<typename CharacterType> void CSSVariableData::updateBackingStringsInTokens()
{
    auto currentOffset = m_backingString.span<CharacterType>();
    for (auto& token : m_tokens) {
        if (!token.hasStringBacking() || token.isBackedByStringLiteral())
            continue;
        unsigned length = token.value().length();
        token.updateCharacters(currentOffset.first(length));
        currentOffset = currentOffset.subspan(length);
    }
    ASSERT(currentOffset.empty());
}

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

CSSVariableData::CSSVariableData(const CSSParserTokenRange& range, const CSSParserContext& context)
    : m_tokens(range.span())
    , m_context(context)
{
    StringBuilder stringBuilder;
    for (auto& token : m_tokens) {
        if (!token.hasStringBacking())
            continue;
        if (token.tryUseStringLiteralBacking())
            continue;
        stringBuilder.append(token.value());
    }

    if (!stringBuilder.isEmpty()) {
        m_backingString = stringBuilder.toString();
        if (m_backingString.is8Bit())
            updateBackingStringsInTokens<LChar>();
        else
            updateBackingStringsInTokens<UChar>();
    }
}

String CSSVariableData::serialize() const
{
    return tokenRange().serialize(CSSParserToken::SerializationMode::CustomProperty);
}

} // namespace WebCore
