2 *******************************************************************************
4 * Copyright (C) 2001-2010, International Business Machines
5 * Corporation and others. All Rights Reserved.
7 *******************************************************************************
8 * file name: casetrn.cpp
10 * tab size: 8 (not used)
13 * created on: 2004sep03
14 * created by: Markus W. Scherer
16 * Implementation class for lower-/upper-/title-casing transliterators.
19 #include "unicode/utypes.h"
21 #if !UCONFIG_NO_TRANSLITERATION
23 #include "unicode/uchar.h"
24 #include "unicode/ustring.h"
29 /* case context iterator using a Replaceable */
30 U_CFUNC UChar32 U_CALLCONV
31 utrans_rep_caseContextIterator(void *context, int8_t dir)
35 UCaseContext *csc=(UCaseContext *)context;
36 Replaceable *rep=(Replaceable *)csc->p;
40 /* reset for backward iteration */
41 csc->index=csc->cpStart;
44 /* reset for forward iteration */
45 csc->index=csc->cpLimit;
48 /* continue current iteration direction */
52 // automatically adjust start and limit if the Replaceable disagrees
53 // with the original values
55 if(csc->start<csc->index) {
56 c=rep->char32At(csc->index-1);
58 csc->start=csc->index;
60 csc->index-=U16_LENGTH(c);
65 // detect, and store in csc->b1, if we hit the limit
66 if(csc->index<csc->limit) {
67 c=rep->char32At(csc->index);
69 csc->limit=csc->index;
72 csc->index+=U16_LENGTH(c);
84 UOBJECT_DEFINE_ABSTRACT_RTTI_IMPLEMENTATION(CaseMapTransliterator)
87 * Constructs a transliterator.
89 CaseMapTransliterator::CaseMapTransliterator(const UnicodeString &id, UCaseMapFull *map) :
90 Transliterator(id, 0),
91 fCsp(ucase_getSingleton()),
94 // TODO test incremental mode with context-sensitive text (e.g. greek sigma)
95 // TODO need to call setMaximumContextLength()?!
101 CaseMapTransliterator::~CaseMapTransliterator() {
107 CaseMapTransliterator::CaseMapTransliterator(const CaseMapTransliterator& o) :
109 fCsp(o.fCsp), fMap(o.fMap)
114 * Assignment operator.
116 /*CaseMapTransliterator& CaseMapTransliterator::operator=(const CaseMapTransliterator& o) {
117 Transliterator::operator=(o);
124 * Transliterator API.
126 /*Transliterator* CaseMapTransliterator::clone(void) const {
127 return new CaseMapTransliterator(*this);
131 * Implements {@link Transliterator#handleTransliterate}.
133 void CaseMapTransliterator::handleTransliterate(Replaceable& text,
134 UTransPosition& offsets,
135 UBool isIncremental) const
137 if (offsets.start >= offsets.limit) {
142 uprv_memset(&csc, 0, sizeof(csc));
144 csc.start = offsets.contextStart;
145 csc.limit = offsets.contextLimit;
150 int32_t textPos, delta, result, locCache=0;
152 for(textPos=offsets.start; textPos<offsets.limit;) {
154 c=text.char32At(textPos);
155 csc.cpLimit=textPos+=U16_LENGTH(c);
157 result=fMap(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache);
159 if(csc.b1 && isIncremental) {
160 // fMap() tried to look beyond the context limit
161 // wait for more input
162 offsets.start=csc.cpStart;
167 // replace the current code point with its full case mapping result
168 // see UCASE_MAX_STRING_LENGTH
169 if(result<=UCASE_MAX_STRING_LENGTH) {
171 tmp.setTo(FALSE, s, result);
172 delta=result-U16_LENGTH(c);
176 delta=tmp.length()-U16_LENGTH(c);
178 text.handleReplaceBetween(csc.cpStart, textPos, tmp);
181 csc.limit=offsets.contextLimit+=delta;
182 offsets.limit+=delta;
186 offsets.start=textPos;
191 #endif /* #if !UCONFIG_NO_TRANSLITERATION */