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      1 /*
      2  * Copyright (C) 2012 Google 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  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     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
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef GridPosition_h
     32 #define GridPosition_h
     33 
     34 #include "wtf/text/WTFString.h"
     35 
     36 namespace blink {
     37 
     38 enum GridPositionType {
     39     AutoPosition,
     40     ExplicitPosition, // [ <integer> || <string> ]
     41     SpanPosition, // span && [ <integer> || <string> ]
     42     NamedGridAreaPosition // <ident>
     43 };
     44 
     45 class GridPosition {
     46 public:
     47     GridPosition()
     48         : m_type(AutoPosition)
     49         , m_integerPosition(0)
     50     {
     51     }
     52 
     53     bool isPositive() const { return integerPosition() > 0; }
     54 
     55     GridPositionType type() const { return m_type; }
     56     bool isAuto() const { return m_type == AutoPosition; }
     57     bool isSpan() const { return m_type == SpanPosition; }
     58     bool isNamedGridArea() const { return m_type == NamedGridAreaPosition; }
     59 
     60     void setExplicitPosition(int position, const String& namedGridLine)
     61     {
     62         m_type = ExplicitPosition;
     63         m_integerPosition = position;
     64         m_namedGridLine = namedGridLine;
     65     }
     66 
     67     void setAutoPosition()
     68     {
     69         m_type = AutoPosition;
     70         m_integerPosition = 0;
     71     }
     72 
     73     // 'span' values cannot be negative, yet we reuse the <integer> position which can
     74     // be. This means that we have to convert the span position to an integer, losing
     75     // some precision here. It shouldn't be an issue in practice though.
     76     void setSpanPosition(int position, const String& namedGridLine)
     77     {
     78         m_type = SpanPosition;
     79         m_integerPosition = position;
     80         m_namedGridLine = namedGridLine;
     81     }
     82 
     83     void setNamedGridArea(const String& namedGridArea)
     84     {
     85         m_type = NamedGridAreaPosition;
     86         m_namedGridLine = namedGridArea;
     87     }
     88 
     89     int integerPosition() const
     90     {
     91         ASSERT(type() == ExplicitPosition);
     92         return m_integerPosition;
     93     }
     94 
     95     String namedGridLine() const
     96     {
     97         ASSERT(type() == ExplicitPosition || type() == SpanPosition || type() == NamedGridAreaPosition);
     98         return m_namedGridLine;
     99     }
    100 
    101     int spanPosition() const
    102     {
    103         ASSERT(type() == SpanPosition);
    104         return m_integerPosition;
    105     }
    106 
    107     bool operator==(const GridPosition& other) const
    108     {
    109         return m_type == other.m_type && m_integerPosition == other.m_integerPosition && m_namedGridLine == other.m_namedGridLine;
    110     }
    111 
    112     bool shouldBeResolvedAgainstOppositePosition() const
    113     {
    114         return isAuto() || isSpan();
    115     }
    116 private:
    117     GridPositionType m_type;
    118     int m_integerPosition;
    119     String m_namedGridLine;
    120 };
    121 
    122 } // namespace blink
    123 
    124 #endif // GridPosition_h
    125