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// 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(bool bSeparateNeutral)
{
m_bSeparateNeutral = bSeparateNeutral;
}
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;
}
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;
}
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;
}
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