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// Copyright (C) 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
* Copyright (C) 2001-2011, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
* Date Name Description
* 05/24/01 aliu Creation.
**********************************************************************
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_TRANSLITERATION
#include "unicode/uchar.h"
#include "unicode/uniset.h"
#include "unicode/ustring.h"
#include "unicode/utf16.h"
#include "titletrn.h"
#include "umutex.h"
#include "ucase.h"
#include "cpputils.h"
U_NAMESPACE_BEGIN
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TitlecaseTransliterator)
TitlecaseTransliterator::TitlecaseTransliterator() :
CaseMapTransliterator(UNICODE_STRING("Any-Title", 9), NULL)
{
// Need to look back 2 characters in the case of "can't"
setMaximumContextLength(2);
}
/**
* Destructor.
*/
TitlecaseTransliterator::~TitlecaseTransliterator() {
}
/**
* Copy constructor.
*/
TitlecaseTransliterator::TitlecaseTransliterator(const TitlecaseTransliterator& o) :
CaseMapTransliterator(o)
{
}
/**
* Assignment operator.
*/
/*TitlecaseTransliterator& TitlecaseTransliterator::operator=(
const TitlecaseTransliterator& o) {
CaseMapTransliterator::operator=(o);
return *this;
}*/
/**
* Transliterator API.
*/
Transliterator* TitlecaseTransliterator::clone(void) const {
return new TitlecaseTransliterator(*this);
}
/**
* Implements {@link Transliterator#handleTransliterate}.
*/
void TitlecaseTransliterator::handleTransliterate(
Replaceable& text, UTransPosition& offsets,
UBool isIncremental) const
{
// TODO reimplement, see ustrcase.c
// using a real word break iterator
// instead of just looking for a transition between cased and uncased characters
// call CaseMapTransliterator::handleTransliterate() for lowercasing? (set fMap)
// needs to take isIncremental into account because case mappings are context-sensitive
// also detect when lowercasing function did not finish because of context
if (offsets.start >= offsets.limit) {
return;
}
// case type: >0 cased (UCASE_LOWER etc.) ==0 uncased <0 case-ignorable
int32_t type;
// Our mode; we are either converting letter toTitle or
// toLower.
UBool doTitle = TRUE;
// Determine if there is a preceding context of cased case-ignorable*,
// in which case we want to start in toLower mode. If the
// prior context is anything else (including empty) then start
// in toTitle mode.
UChar32 c;
int32_t start;
for (start = offsets.start - 1; start >= offsets.contextStart; start -= U16_LENGTH(c)) {
c = text.char32At(start);
type=ucase_getTypeOrIgnorable(fCsp, c);
if(type>0) { // cased
doTitle=FALSE;
break;
} else if(type==0) { // uncased but not ignorable
break;
}
// else (type<0) case-ignorable: continue
}
// Convert things after a cased character toLower; things
// after an uncased, non-case-ignorable character toTitle. Case-ignorable
// characters are copied directly and do not change the mode.
UCaseContext csc;
uprv_memset(&csc, 0, sizeof(csc));
csc.p = &text;
csc.start = offsets.contextStart;
csc.limit = offsets.contextLimit;
UnicodeString tmp;
const UChar *s;
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);
type=ucase_getTypeOrIgnorable(fCsp, c);
if(type>=0) { // not case-ignorable
if(doTitle) {
result=ucase_toFullTitle(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache);
} else {
result=ucase_toFullLower(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache);
}
doTitle = (UBool)(type==0); // doTitle=isUncased
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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