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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 #include "config.h"
     32 #include "platform/LengthBox.h"
     33 
     34 namespace blink {
     35 
     36 const Length& LengthBox::logicalLeft(WritingMode writingMode) const
     37 {
     38     return isHorizontalWritingMode(writingMode) ? m_left : m_top;
     39 }
     40 
     41 const Length& LengthBox::logicalRight(WritingMode writingMode) const
     42 {
     43     return isHorizontalWritingMode(writingMode) ? m_right : m_bottom;
     44 }
     45 
     46 const Length& LengthBox::before(WritingMode writingMode) const
     47 {
     48     switch (writingMode) {
     49     case TopToBottomWritingMode:
     50         return m_top;
     51     case BottomToTopWritingMode:
     52         return m_bottom;
     53     case LeftToRightWritingMode:
     54         return m_left;
     55     case RightToLeftWritingMode:
     56         return m_right;
     57     }
     58     ASSERT_NOT_REACHED();
     59     return m_top;
     60 }
     61 
     62 const Length& LengthBox::after(WritingMode writingMode) const
     63 {
     64     switch (writingMode) {
     65     case TopToBottomWritingMode:
     66         return m_bottom;
     67     case BottomToTopWritingMode:
     68         return m_top;
     69     case LeftToRightWritingMode:
     70         return m_right;
     71     case RightToLeftWritingMode:
     72         return m_left;
     73     }
     74     ASSERT_NOT_REACHED();
     75     return m_bottom;
     76 }
     77 
     78 const Length& LengthBox::start(WritingMode writingMode, TextDirection direction) const
     79 {
     80     if (isHorizontalWritingMode(writingMode))
     81         return isLeftToRightDirection(direction) ? m_left : m_right;
     82     return isLeftToRightDirection(direction) ? m_top : m_bottom;
     83 }
     84 
     85 const Length& LengthBox::end(WritingMode writingMode, TextDirection direction) const
     86 {
     87     if (isHorizontalWritingMode(writingMode))
     88         return isLeftToRightDirection(direction) ? m_right : m_left;
     89     return isLeftToRightDirection(direction) ? m_bottom : m_top;
     90 }
     91 
     92 } // namespace blink
     93