core/src/fxcrt/fx_arabic.cpp

// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "../../include/fxcrt/fx_ucd.h"
#include "fx_arabic.h"

extern const FX_DWORD gs_FX_TextLayout_CodeProperties[65536];
IFX_BidiChar* IFX_BidiChar::Create() {
  return new CFX_BidiChar;
}
CFX_BidiChar::CFX_BidiChar()
    : m_bSeparateNeutral(TRUE),
      m_iCurStart(0),
      m_iCurCount(0),
      m_iCurBidi(0),
      m_iLastBidi(0),
      m_iLastStart(0),
      m_iLastCount(0) {}
void CFX_BidiChar::SetPolicy(FX_BOOL bSeparateNeutral) {
  m_bSeparateNeutral = bSeparateNeutral;
}

FX_BOOL CFX_BidiChar::AppendChar(FX_WCHAR wch) {
  FX_DWORD dwProps = gs_FX_TextLayout_CodeProperties[(FX_WORD)wch];
  int32_t iBidiCls = (dwProps & FX_BIDICLASSBITSMASK) >> FX_BIDICLASSBITS;
  int32_t iContext = 0;
  switch (iBidiCls) {
    case FX_BIDICLASS_L:
    case FX_BIDICLASS_AN:
    case FX_BIDICLASS_EN:
      iContext = 1;
      break;
    case FX_BIDICLASS_R:
    case FX_BIDICLASS_AL:
      iContext = 2;
      break;
  }
  FX_BOOL bRet = FALSE;
  if (iContext != m_iCurBidi) {
    if (m_bSeparateNeutral) {
      bRet = TRUE;
    } else {
      if (m_iCurBidi == 0) {
        bRet = (m_iCurCount > 0);
      } else {
        bRet = (iContext != 0);
      }
    }
    if (bRet) {
      m_iLastBidi = m_iCurBidi;
      m_iLastStart = m_iCurStart;
      m_iCurStart = m_iCurCount;
      m_iLastCount = m_iCurCount - m_iLastStart;
    }
    if (m_bSeparateNeutral || iContext != 0) {
      m_iCurBidi = iContext;
    }
  }
  m_iCurCount++;
  return bRet;
}
FX_BOOL CFX_BidiChar::EndChar() {
  m_iLastBidi = m_iCurBidi;
  m_iLastStart = m_iCurStart;
  m_iCurStart = m_iCurCount;
  m_iLastCount = m_iCurCount - m_iLastStart;
  return m_iLastCount > 0;
}
int32_t CFX_BidiChar::GetBidiInfo(int32_t& iStart, int32_t& iCount) {
  iStart = m_iLastStart;
  iCount = m_iLastCount;
  return m_iLastBidi;
}
void CFX_BidiChar::Reset() {
  m_iCurStart = 0;
  m_iCurCount = 0;
  m_iCurBidi = 0;
  m_iLastBidi = 0;
  m_iLastStart = 0;
  m_iLastCount = 0;
}