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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 "xfa/fee/fx_wordbreak/fx_wordbreak_impl.h"
FX_WordBreakProp FX_GetWordBreakProperty(FX_WCHAR wcCodePoint) {
uint32_t dwProperty =
(uint32_t)gs_FX_WordBreak_CodePointProperties[wcCodePoint >> 1];
return (FX_WordBreakProp)(((wcCodePoint)&1) ? (dwProperty & 0x0F)
: (dwProperty >> 4));
}
CFX_CharIter::CFX_CharIter(const CFX_WideString& wsText)
: m_wsText(wsText), m_nIndex(0) {
ASSERT(!wsText.IsEmpty());
}
CFX_CharIter::~CFX_CharIter() {}
void CFX_CharIter::Release() {
delete this;
}
FX_BOOL CFX_CharIter::Next(FX_BOOL bPrev) {
if (bPrev) {
if (m_nIndex <= 0) {
return FALSE;
}
m_nIndex--;
} else {
if (m_nIndex + 1 >= m_wsText.GetLength()) {
return FALSE;
}
m_nIndex++;
}
return TRUE;
}
FX_WCHAR CFX_CharIter::GetChar() {
return m_wsText.GetAt(m_nIndex);
}
void CFX_CharIter::SetAt(int32_t nIndex) {
if (nIndex < 0 || nIndex >= m_wsText.GetLength()) {
return;
}
m_nIndex = nIndex;
}
int32_t CFX_CharIter::GetAt() const {
return m_nIndex;
}
FX_BOOL CFX_CharIter::IsEOF(FX_BOOL bTail) const {
return bTail ? (m_nIndex + 1 == m_wsText.GetLength()) : (m_nIndex == 0);
}
IFX_CharIter* CFX_CharIter::Clone() {
CFX_CharIter* pIter = new CFX_CharIter(m_wsText);
pIter->m_nIndex = m_nIndex;
return pIter;
}
CFX_WordBreak::CFX_WordBreak() : m_pPreIter(NULL), m_pCurIter(NULL) {}
CFX_WordBreak::~CFX_WordBreak() {
if (m_pPreIter) {
m_pPreIter->Release();
m_pPreIter = NULL;
}
if (m_pCurIter) {
m_pCurIter->Release();
m_pCurIter = NULL;
}
}
void CFX_WordBreak::Release() {
delete this;
}
void CFX_WordBreak::Attach(IFX_CharIter* pIter) {
ASSERT(pIter);
m_pCurIter = pIter;
}
void CFX_WordBreak::Attach(const CFX_WideString& wsText) {
m_pCurIter = new CFX_CharIter(wsText);
}
FX_BOOL CFX_WordBreak::Next(FX_BOOL bPrev) {
IFX_CharIter* pIter = bPrev ? m_pPreIter->Clone() : m_pCurIter->Clone();
if (pIter->IsEOF(!bPrev)) {
return FALSE;
}
pIter->Next(bPrev);
if (!FindNextBreakPos(pIter, bPrev, TRUE)) {
pIter->Release();
return FALSE;
}
if (bPrev) {
m_pCurIter->Release();
m_pCurIter = m_pPreIter;
m_pCurIter->Next(TRUE);
m_pPreIter = pIter;
} else {
m_pPreIter->Release();
m_pPreIter = m_pCurIter;
m_pPreIter->Next();
m_pCurIter = pIter;
}
return TRUE;
}
void CFX_WordBreak::SetAt(int32_t nIndex) {
if (m_pPreIter) {
m_pPreIter->Release();
m_pPreIter = NULL;
}
m_pCurIter->SetAt(nIndex);
FindNextBreakPos(m_pCurIter, TRUE, FALSE);
m_pPreIter = m_pCurIter;
m_pCurIter = m_pPreIter->Clone();
FindNextBreakPos(m_pCurIter, FALSE, FALSE);
}
int32_t CFX_WordBreak::GetWordPos() const {
return m_pPreIter->GetAt();
}
int32_t CFX_WordBreak::GetWordLength() const {
return m_pCurIter->GetAt() - m_pPreIter->GetAt() + 1;
}
void CFX_WordBreak::GetWord(CFX_WideString& wsWord) const {
int32_t nWordLength = GetWordLength();
if (nWordLength <= 0) {
return;
}
FX_WCHAR* lpBuf = wsWord.GetBuffer(nWordLength);
IFX_CharIter* pTempIter = m_pPreIter->Clone();
int32_t i = 0;
while (pTempIter->GetAt() <= m_pCurIter->GetAt()) {
lpBuf[i++] = pTempIter->GetChar();
FX_BOOL bEnd = pTempIter->Next();
if (!bEnd) {
break;
}
}
pTempIter->Release();
wsWord.ReleaseBuffer(nWordLength);
}
FX_BOOL CFX_WordBreak::IsEOF(FX_BOOL bTail) const {
return m_pCurIter->IsEOF(bTail);
}
FX_BOOL CFX_WordBreak::FindNextBreakPos(IFX_CharIter* pIter,
FX_BOOL bPrev,
FX_BOOL bFromNext) {
FX_WordBreakProp ePreType = FX_WordBreakProp_None;
FX_WordBreakProp eCurType = FX_WordBreakProp_None;
FX_WordBreakProp eNextType = FX_WordBreakProp_None;
if (pIter->IsEOF(!bPrev)) {
return TRUE;
}
if (!(bFromNext || pIter->IsEOF(bPrev))) {
pIter->Next(!bPrev);
FX_WCHAR wcTemp = pIter->GetChar();
ePreType = FX_GetWordBreakProperty(wcTemp);
pIter->Next(bPrev);
}
FX_WCHAR wcTemp = pIter->GetChar();
eCurType = FX_GetWordBreakProperty(wcTemp);
FX_BOOL bFirst = TRUE;
do {
pIter->Next(bPrev);
FX_WCHAR wcTemp = pIter->GetChar();
eNextType = FX_GetWordBreakProperty(wcTemp);
uint16_t wBreak =
gs_FX_WordBreak_Table[eCurType] & ((uint16_t)(1 << eNextType));
if (wBreak) {
if (pIter->IsEOF(!bPrev)) {
pIter->Next(!bPrev);
return TRUE;
}
if (bFirst) {
int32_t nFlags = 0;
if (eCurType == FX_WordBreakProp_MidLetter) {
if (eNextType == FX_WordBreakProp_ALetter) {
nFlags = 1;
}
} else if (eCurType == FX_WordBreakProp_MidNum) {
if (eNextType == FX_WordBreakProp_Numberic) {
nFlags = 2;
}
} else if (eCurType == FX_WordBreakProp_MidNumLet) {
if (eNextType == FX_WordBreakProp_ALetter) {
nFlags = 1;
} else if (eNextType == FX_WordBreakProp_Numberic) {
nFlags = 2;
}
}
if (nFlags > 0) {
ASSERT(nFlags <= 2);
if (!((nFlags == 1 && ePreType == FX_WordBreakProp_ALetter) ||
(nFlags == 2 && ePreType == FX_WordBreakProp_Numberic))) {
pIter->Next(!bPrev);
return TRUE;
}
pIter->Next(bPrev);
wBreak = FALSE;
}
bFirst = FALSE;
}
if (wBreak) {
int32_t nFlags = 0;
if (eNextType == FX_WordBreakProp_MidLetter) {
if (eCurType == FX_WordBreakProp_ALetter) {
nFlags = 1;
}
} else if (eNextType == FX_WordBreakProp_MidNum) {
if (eCurType == FX_WordBreakProp_Numberic) {
nFlags = 2;
}
} else if (eNextType == FX_WordBreakProp_MidNumLet) {
if (eCurType == FX_WordBreakProp_ALetter) {
nFlags = 1;
} else if (eCurType == FX_WordBreakProp_Numberic) {
nFlags = 2;
}
}
if (nFlags <= 0) {
pIter->Next(!bPrev);
return TRUE;
}
ASSERT(nFlags <= 2);
pIter->Next(bPrev);
wcTemp = pIter->GetChar();
eNextType = (FX_WordBreakProp)FX_GetWordBreakProperty(wcTemp);
if (!((nFlags == 1 && eNextType == FX_WordBreakProp_ALetter) ||
(nFlags == 2 && eNextType == FX_WordBreakProp_Numberic))) {
pIter->Next(!bPrev);
pIter->Next(!bPrev);
return TRUE;
}
}
}
ePreType = eCurType;
eCurType = eNextType;
bFirst = FALSE;
} while (!pIter->IsEOF(!bPrev));
return TRUE;
}
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