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 WebCore { 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 // 'span' values cannot be negative, yet we reuse the <integer> position which can 68 // be. This means that we have to convert the span position to an integer, losing 69 // some precision here. It shouldn't be an issue in practice though. 70 void setSpanPosition(int position, const String& namedGridLine) 71 { 72 m_type = SpanPosition; 73 m_integerPosition = position; 74 m_namedGridLine = namedGridLine; 75 } 76 77 void setNamedGridArea(const String& namedGridArea) 78 { 79 m_type = NamedGridAreaPosition; 80 m_namedGridLine = namedGridArea; 81 } 82 83 int integerPosition() const 84 { 85 ASSERT(type() == ExplicitPosition); 86 return m_integerPosition; 87 } 88 89 String namedGridLine() const 90 { 91 ASSERT(type() == ExplicitPosition || type() == SpanPosition || type() == NamedGridAreaPosition); 92 return m_namedGridLine; 93 } 94 95 int spanPosition() const 96 { 97 ASSERT(type() == SpanPosition); 98 return m_integerPosition; 99 } 100 101 bool operator==(const GridPosition& other) const 102 { 103 return m_type == other.m_type && m_integerPosition == other.m_integerPosition && m_namedGridLine == other.m_namedGridLine; 104 } 105 106 bool shouldBeResolvedAgainstOppositePosition() const 107 { 108 return isAuto() || isSpan(); 109 } 110 private: 111 GridPositionType m_type; 112 int m_integerPosition; 113 String m_namedGridLine; 114 }; 115 116 } // namespace WebCore 117 118 #endif // GridPosition_h 119