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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_bidi.h"
#include "../../include/fxcrt/fx_ucd.h"
CFX_BidiChar::CFX_BidiChar()
: m_iCurStart(0),
m_iCurCount(0),
m_CurBidi(NEUTRAL),
m_iLastStart(0),
m_iLastCount(0),
m_LastBidi(NEUTRAL) {
}
CFX_BidiChar::~CFX_BidiChar() {
}
bool CFX_BidiChar::AppendChar(FX_WCHAR wch) {
FX_DWORD dwProps = FX_GetUnicodeProperties(wch);
int32_t iBidiCls = (dwProps & FX_BIDICLASSBITSMASK) >> FX_BIDICLASSBITS;
Direction bidi = NEUTRAL;
switch (iBidiCls) {
case FX_BIDICLASS_L:
case FX_BIDICLASS_AN:
case FX_BIDICLASS_EN:
bidi = LEFT;
break;
case FX_BIDICLASS_R:
case FX_BIDICLASS_AL:
bidi = RIGHT;
break;
}
bool bRet = (bidi != m_CurBidi);
if (bRet) {
SaveCurrentStateToLastState();
m_CurBidi = bidi;
}
m_iCurCount++;
return bRet;
}
bool CFX_BidiChar::EndChar() {
SaveCurrentStateToLastState();
return m_iLastCount > 0;
}
CFX_BidiChar::Direction CFX_BidiChar::GetBidiInfo(int32_t* iStart,
int32_t* iCount) const {
if (iStart)
*iStart = m_iLastStart;
if (iCount)
*iCount = m_iLastCount;
return m_LastBidi;
}
void CFX_BidiChar::SaveCurrentStateToLastState() {
m_LastBidi = m_CurBidi;
m_iLastStart = m_iCurStart;
m_iCurStart = m_iCurCount;
m_iLastCount = m_iCurCount - m_iLastStart;
}
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