168 lines
5.2 KiB
C++
168 lines
5.2 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 2001-2005, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 05/24/01 aliu Creation.
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**********************************************************************
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_TRANSLITERATION
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#include "unicode/uchar.h"
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#include "unicode/uniset.h"
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#include "unicode/ustring.h"
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#include "titletrn.h"
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#include "umutex.h"
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#include "ucase.h"
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#include "cpputils.h"
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U_NAMESPACE_BEGIN
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UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TitlecaseTransliterator)
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TitlecaseTransliterator::TitlecaseTransliterator() :
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CaseMapTransliterator(UNICODE_STRING("Any-Title", 9), NULL)
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{
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// Need to look back 2 characters in the case of "can't"
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setMaximumContextLength(2);
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}
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/**
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* Destructor.
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*/
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TitlecaseTransliterator::~TitlecaseTransliterator() {
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}
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/**
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* Copy constructor.
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*/
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TitlecaseTransliterator::TitlecaseTransliterator(const TitlecaseTransliterator& o) :
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CaseMapTransliterator(o)
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{
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}
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/**
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* Assignment operator.
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*/
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TitlecaseTransliterator& TitlecaseTransliterator::operator=(
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const TitlecaseTransliterator& o) {
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CaseMapTransliterator::operator=(o);
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return *this;
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}
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/**
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* Transliterator API.
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*/
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Transliterator* TitlecaseTransliterator::clone(void) const {
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return new TitlecaseTransliterator(*this);
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}
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/**
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* Implements {@link Transliterator#handleTransliterate}.
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*/
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void TitlecaseTransliterator::handleTransliterate(
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Replaceable& text, UTransPosition& offsets,
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UBool isIncremental) const
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{
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// TODO reimplement, see ustrcase.c
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// using a real word break iterator
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// instead of just looking for a transition between cased and uncased characters
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// call CaseMapTransliterator::handleTransliterate() for lowercasing? (set fMap)
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// needs to take isIncremental into account because case mappings are context-sensitive
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// also detect when lowercasing function did not finish because of context
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if (offsets.start >= offsets.limit) {
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return;
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}
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// case type: >0 cased (UCASE_LOWER etc.) ==0 uncased <0 case-ignorable
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int32_t type;
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// Our mode; we are either converting letter toTitle or
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// toLower.
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UBool doTitle = TRUE;
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// Determine if there is a preceding context of cased case-ignorable*,
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// in which case we want to start in toLower mode. If the
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// prior context is anything else (including empty) then start
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// in toTitle mode.
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UChar32 c;
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int32_t start;
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for (start = offsets.start - 1; start >= offsets.contextStart; start -= U16_LENGTH(c)) {
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c = text.char32At(start);
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type=ucase_getTypeOrIgnorable(fCsp, c);
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if(type>0) { // cased
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doTitle=FALSE;
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break;
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} else if(type==0) { // uncased but not ignorable
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break;
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}
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// else (type<0) case-ignorable: continue
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}
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// Convert things after a cased character toLower; things
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// after an uncased, non-case-ignorable character toTitle. Case-ignorable
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// characters are copied directly and do not change the mode.
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UCaseContext csc;
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uprv_memset(&csc, 0, sizeof(csc));
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csc.p = &text;
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csc.start = offsets.contextStart;
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csc.limit = offsets.contextLimit;
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UnicodeString tmp;
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const UChar *s;
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int32_t textPos, delta, result, locCache=0;
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for(textPos=offsets.start; textPos<offsets.limit;) {
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csc.cpStart=textPos;
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c=text.char32At(textPos);
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csc.cpLimit=textPos+=U16_LENGTH(c);
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type=ucase_getTypeOrIgnorable(fCsp, c);
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if(type>=0) { // not case-ignorable
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if(doTitle) {
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result=ucase_toFullTitle(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache);
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} else {
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result=ucase_toFullLower(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache);
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}
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doTitle = (UBool)(type==0); // doTitle=isUncased
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if(csc.b1 && isIncremental) {
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// fMap() tried to look beyond the context limit
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// wait for more input
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offsets.start=csc.cpStart;
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return;
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}
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if(result>=0) {
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// replace the current code point with its full case mapping result
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// see UCASE_MAX_STRING_LENGTH
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if(result<=UCASE_MAX_STRING_LENGTH) {
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// string s[result]
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tmp.setTo(FALSE, s, result);
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delta=result-U16_LENGTH(c);
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} else {
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// single code point
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tmp.setTo(result);
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delta=tmp.length()-U16_LENGTH(c);
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}
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text.handleReplaceBetween(csc.cpStart, textPos, tmp);
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if(delta!=0) {
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textPos+=delta;
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csc.limit=offsets.contextLimit+=delta;
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offsets.limit+=delta;
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}
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}
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}
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}
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offsets.start=textPos;
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}
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_TRANSLITERATION */
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