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// Copyright 2016 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 "xfa/fde/cfde_txtedtbufiter.h"
#include "xfa/fde/cfde_txtedtbuf.h"
CFDE_TxtEdtBufIter::CFDE_TxtEdtBufIter(CFDE_TxtEdtBuf* pBuf, FX_WCHAR wcAlias)
: m_pBuf(pBuf),
m_nCurChunk(0),
m_nCurIndex(0),
m_nIndex(0),
m_Alias(wcAlias) {
ASSERT(m_pBuf);
}
CFDE_TxtEdtBufIter::~CFDE_TxtEdtBufIter() {}
FX_BOOL CFDE_TxtEdtBufIter::Next(FX_BOOL bPrev) {
if (bPrev) {
if (m_nIndex == 0) {
return FALSE;
}
ASSERT(m_nCurChunk < m_pBuf->m_Chunks.GetSize());
CFDE_TxtEdtBuf::FDE_CHUNKHEADER* lpChunk = nullptr;
if (m_nCurIndex > 0) {
m_nCurIndex--;
} else {
while (m_nCurChunk > 0) {
--m_nCurChunk;
lpChunk = m_pBuf->m_Chunks[m_nCurChunk];
if (lpChunk->nUsed > 0) {
m_nCurIndex = lpChunk->nUsed - 1;
break;
}
}
}
ASSERT(m_nCurChunk >= 0);
m_nIndex--;
return TRUE;
} else {
if (m_nIndex >= (m_pBuf->m_nTotal - 1)) {
return FALSE;
}
ASSERT(m_nCurChunk < m_pBuf->m_Chunks.GetSize());
CFDE_TxtEdtBuf::FDE_CHUNKHEADER* lpChunk = m_pBuf->m_Chunks[m_nCurChunk];
if (lpChunk->nUsed != (m_nCurIndex + 1)) {
m_nCurIndex++;
} else {
int32_t nEnd = m_pBuf->m_Chunks.GetSize() - 1;
while (m_nCurChunk < nEnd) {
m_nCurChunk++;
CFDE_TxtEdtBuf::FDE_CHUNKHEADER* lpChunkTemp =
m_pBuf->m_Chunks[m_nCurChunk];
if (lpChunkTemp->nUsed > 0) {
m_nCurIndex = 0;
break;
}
}
}
m_nIndex++;
return TRUE;
}
}
void CFDE_TxtEdtBufIter::SetAt(int32_t nIndex) {
ASSERT(nIndex >= 0 && nIndex < m_pBuf->m_nTotal);
CFDE_TxtEdtBuf::FDE_CHUNKPLACE cp;
m_pBuf->Index2CP(nIndex, cp);
m_nIndex = nIndex;
m_nCurChunk = cp.nChunkIndex;
m_nCurIndex = cp.nCharIndex;
}
int32_t CFDE_TxtEdtBufIter::GetAt() const {
return m_nIndex;
}
FX_WCHAR CFDE_TxtEdtBufIter::GetChar() {
ASSERT(m_nIndex >= 0 && m_nIndex < m_pBuf->m_nTotal);
if (m_Alias == 0 || m_nIndex == (m_pBuf->m_nTotal - 1))
return m_pBuf->m_Chunks[m_nCurChunk]->wChars[m_nCurIndex];
return m_Alias;
}
FX_BOOL CFDE_TxtEdtBufIter::IsEOF(FX_BOOL bTail) const {
return bTail ? m_nIndex == (m_pBuf->GetTextLength() - 2) : m_nIndex == 0;
}
IFX_CharIter* CFDE_TxtEdtBufIter::Clone() {
CFDE_TxtEdtBufIter* pIter = new CFDE_TxtEdtBufIter(m_pBuf);
pIter->m_nCurChunk = m_nCurChunk;
pIter->m_nCurIndex = m_nCurIndex;
pIter->m_nIndex = m_nIndex;
pIter->m_Alias = m_Alias;
return pIter;
}
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