1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Copyright (C) 2016 Apple Inc. All rights reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions are
6// met:
7//
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9// notice, this list of conditions and the following disclaimer.
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12// in the documentation and/or other materials provided with the
13// distribution.
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15// contributors may be used to endorse or promote products derived from
16// this software without specific prior written permission.
17//
18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30#pragma once
31
32#include "CSSParserToken.h"
33#include "CSSParserTokenRange.h"
34#include <wtf/text/WTFString.h>
35
36namespace WebCore {
37
38class Document;
39
40struct SizesCalcValue {
41 double value;
42 bool isLength;
43 UChar operation;
44
45 SizesCalcValue()
46 : value(0)
47 , isLength(false)
48 , operation(0)
49 {
50 }
51
52 SizesCalcValue(double numericValue, bool length)
53 : value(numericValue)
54 , isLength(length)
55 , operation(0)
56 {
57 }
58};
59
60class SizesCalcParser {
61public:
62 SizesCalcParser(CSSParserTokenRange, const Document&);
63
64 float result() const;
65 bool isValid() const { return m_isValid; }
66
67private:
68 bool calcToReversePolishNotation(CSSParserTokenRange);
69 bool calculate();
70 void appendNumber(const CSSParserToken&);
71 bool appendLength(const CSSParserToken&);
72 bool handleOperator(Vector<CSSParserToken>& stack, const CSSParserToken&);
73 void appendOperator(const CSSParserToken&);
74
75 Vector<SizesCalcValue> m_valueList;
76 bool m_isValid;
77 float m_result;
78 const Document& m_document;
79};
80
81} // namespace WebCore
82