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/*
*******************************************************************************
*
* Copyright (C) 2001-2007, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: casetrn.cpp
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2004sep03
* created by: Markus W. Scherer
*
* Implementation class for lower-/upper-/title-casing transliterators.
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_TRANSLITERATION
#include "unicode/uchar.h"
#include "unicode/ustring.h"
#include "tolowtrn.h"
#include "ucase.h"
#include "cpputils.h"
/* case context iterator using a Replaceable */
U_CFUNC UChar32 U_CALLCONV
utrans_rep_caseContextIterator(void *context, int8_t dir)
{
U_NAMESPACE_USE
UCaseContext *csc=(UCaseContext *)context;
Replaceable *rep=(Replaceable *)csc->p;
UChar32 c;
if(dir<0) {
/* reset for backward iteration */
csc->index=csc->cpStart;
csc->dir=dir;
} else if(dir>0) {
/* reset for forward iteration */
csc->index=csc->cpLimit;
csc->dir=dir;
} else {
/* continue current iteration direction */
dir=csc->dir;
}
// automatically adjust start and limit if the Replaceable disagrees
// with the original values
if(dir<0) {
if(csc->start<csc->index) {
c=rep->char32At(csc->index-1);
if(c<0) {
csc->start=csc->index;
} else {
csc->index-=U16_LENGTH(c);
return c;
}
}
} else {
// detect, and store in csc->b1, if we hit the limit
if(csc->index<csc->limit) {
c=rep->char32At(csc->index);
if(c<0) {
csc->limit=csc->index;
csc->b1=TRUE;
} else {
csc->index+=U16_LENGTH(c);
return c;
}
} else {
csc->b1=TRUE;
}
}
return U_SENTINEL;
}
U_NAMESPACE_BEGIN
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(CaseMapTransliterator)
/**
* Constructs a transliterator.
*/
CaseMapTransliterator::CaseMapTransliterator(const UnicodeString &id, UCaseMapFull *map) :
Transliterator(id, 0),
fCsp(NULL),
fMap(map)
{
UErrorCode errorCode = U_ZERO_ERROR;
fCsp = ucase_getSingleton(&errorCode); // expect to get NULL if failure
// TODO test incremental mode with context-sensitive text (e.g. greek sigma)
// TODO need to call setMaximumContextLength()?!
}
/**
* Destructor.
*/
CaseMapTransliterator::~CaseMapTransliterator() {
}
/**
* Copy constructor.
*/
CaseMapTransliterator::CaseMapTransliterator(const CaseMapTransliterator& o) :
Transliterator(o),
fCsp(o.fCsp), fMap(o.fMap)
{
}
/**
* Assignment operator.
*/
/*CaseMapTransliterator& CaseMapTransliterator::operator=(const CaseMapTransliterator& o) {
Transliterator::operator=(o);
fCsp = o.fCsp;
fMap = o.fMap;
return *this;
}*/
/**
* Transliterator API.
*/
Transliterator* CaseMapTransliterator::clone(void) const {
return new CaseMapTransliterator(*this);
}
/**
* Implements {@link Transliterator#handleTransliterate}.
*/
void CaseMapTransliterator::handleTransliterate(Replaceable& text,
UTransPosition& offsets,
UBool isIncremental) const
{
if (offsets.start >= offsets.limit) {
return;
}
UCaseContext csc;
uprv_memset(&csc, 0, sizeof(csc));
csc.p = &text;
csc.start = offsets.contextStart;
csc.limit = offsets.contextLimit;
UnicodeString tmp;
const UChar *s;
UChar32 c;
int32_t textPos, delta, result, locCache=0;
for(textPos=offsets.start; textPos<offsets.limit;) {
csc.cpStart=textPos;
c=text.char32At(textPos);
csc.cpLimit=textPos+=U16_LENGTH(c);
result=fMap(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache);
if(csc.b1 && isIncremental) {
// fMap() tried to look beyond the context limit
// wait for more input
offsets.start=csc.cpStart;
return;
}
if(result>=0) {
// replace the current code point with its full case mapping result
// see UCASE_MAX_STRING_LENGTH
if(result<=UCASE_MAX_STRING_LENGTH) {
// string s[result]
tmp.setTo(FALSE, s, result);
delta=result-U16_LENGTH(c);
} else {
// single code point
tmp.setTo(result);
delta=tmp.length()-U16_LENGTH(c);
}
text.handleReplaceBetween(csc.cpStart, textPos, tmp);
if(delta!=0) {
textPos+=delta;
csc.limit=offsets.contextLimit+=delta;
offsets.limit+=delta;
}
}
}
offsets.start=textPos;
}
U_NAMESPACE_END
#endif /* #if !UCONFIG_NO_TRANSLITERATION */
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