SizesCalcParser.h   [plain text]

// Copyright 2014 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 Apple Inc. All rights reserved.
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#pragma once

#include "CSSParserToken.h"
#include "CSSParserTokenRange.h"
#include <wtf/text/WTFString.h>

namespace WebCore {

class Document;

struct SizesCalcValue {
    double value;
    bool isLength;
    UChar operation;

    SizesCalcValue()
        : value(0)
        , isLength(false)
        , operation(0)
    {
    }

    SizesCalcValue(double numericValue, bool length)
        : value(numericValue)
        , isLength(length)
        , operation(0)
    {
    }
};

class SizesCalcParser {
public:
    SizesCalcParser(CSSParserTokenRange, const Document&);

    float result() const;
    bool isValid() const { return m_isValid; }

private:
    bool calcToReversePolishNotation(CSSParserTokenRange);
    bool calculate();
    void appendNumber(const CSSParserToken&);
    bool appendLength(const CSSParserToken&);
    bool handleOperator(Vector<CSSParserToken>& stack, const CSSParserToken&);
    void appendOperator(const CSSParserToken&);

    Vector<SizesCalcValue> m_valueList;
    bool m_isValid;
    float m_result;
    const Document& m_document;
};

} // namespace WebCore