third_party/WebKit/Source/platform/LengthBox.cpp

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#include "platform/LengthBox.h"

namespace blink {

const Length& LengthBox::logicalLeft(WritingMode writingMode) const {
  return isHorizontalWritingMode(writingMode) ? m_left : m_top;
}

const Length& LengthBox::logicalRight(WritingMode writingMode) const {
  return isHorizontalWritingMode(writingMode) ? m_right : m_bottom;
}

const Length& LengthBox::before(WritingMode writingMode) const {
  switch (writingMode) {
    case WritingMode::HorizontalTb:
      return m_top;
    case WritingMode::VerticalLr:
      return m_left;
    case WritingMode::VerticalRl:
      return m_right;
  }
  ASSERT_NOT_REACHED();
  return m_top;
}

const Length& LengthBox::after(WritingMode writingMode) const {
  switch (writingMode) {
    case WritingMode::HorizontalTb:
      return m_bottom;
    case WritingMode::VerticalLr:
      return m_right;
    case WritingMode::VerticalRl:
      return m_left;
  }
  ASSERT_NOT_REACHED();
  return m_bottom;
}

const Length& LengthBox::start(WritingMode writingMode,
                               TextDirection direction) const {
  if (isHorizontalWritingMode(writingMode))
    return isLeftToRightDirection(direction) ? m_left : m_right;
  return isLeftToRightDirection(direction) ? m_top : m_bottom;
}

const Length& LengthBox::end(WritingMode writingMode,
                             TextDirection direction) const {
  if (isHorizontalWritingMode(writingMode))
    return isLeftToRightDirection(direction) ? m_right : m_left;
  return isLeftToRightDirection(direction) ? m_bottom : m_top;
}

const Length& LengthBox::over(WritingMode writingMode) const {
  return isHorizontalWritingMode(writingMode) ? m_top : m_right;
}

const Length& LengthBox::under(WritingMode writingMode) const {
  return isHorizontalWritingMode(writingMode) ? m_bottom : m_left;
}

}  // namespace blink