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ICU-4933 titlecase first _cased_ letter

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X-SVN-Rev: 19921
This commit is contained in:
Markus Scherer 2006-07-28 22:43:40 +00:00
parent 948a4e842f
commit cbb5fd45d1
2 changed files with 59 additions and 22 deletions
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78
icu4c/source/common/ustrcase.c
View File

@ -1,7 +1,7 @@
/*
*******************************************************************************
*
* Copyright (C) 2001-2005, International Business Machines
* Copyright (C) 2001-2006, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
@ -174,7 +174,7 @@ _toTitle(const UCaseProps *csp,
UErrorCode *pErrorCode) {
const UChar *s;
UChar32 c;
int32_t prev, index, destIndex;
int32_t prev, titleStart, titleLimit, index, destIndex, length;
UBool isFirstIndex;
/* set up local variables */
@ -195,28 +195,64 @@ _toTitle(const UCaseProps *csp,
index=srcLength;
}
/* lowercase [prev..index[ */
/*
* Unicode 4 & 5 section 3.13 Default Case Operations:
*
* R3 toTitlecase(X): Find the word boundaries based on Unicode Standard Annex
* #29, "Text Boundaries." Between each pair of word boundaries, find the first
* cased character F. If F exists, map F to default_title(F); then map each
* subsequent character C to default_lower(C).
*
* In this implementation, segment [prev..index[ into 3 parts:
* a) uncased characters (copy as-is) [prev..titleStart[
* b) first case letter (titlecase) [titleStart..titleLimit[
* c) subsequent characters (lowercase) [titleLimit..index[
*/
if(prev<index) {
destIndex+=
_caseMap(
csp, ucase_toFullLower,
dest+destIndex, destCapacity-destIndex,
src, csc,
prev, index,
locale, locCache,
pErrorCode);
}
/* find and copy uncased characters [prev..titleStart[ */
titleStart=titleLimit=prev;
for(;;) {
U16_NEXT(src, titleLimit, srcLength, c);
if(UCASE_NONE!=ucase_getType(csp, c)) {
break; /* cased letter at [titleStart..titleLimit[ */
}
titleStart=titleLimit;
if(titleLimit==index) {
/*
* only uncased characters in [prev..index[
* stop with titleStart==titleLimit==index
*/
break;
}
}
length=titleStart-prev;
if(length>0) {
if((destIndex+length)<=destCapacity) {
uprv_memcpy(dest+destIndex, src+prev, length*U_SIZEOF_UCHAR);
}
destIndex+=length;
}
if(index>=srcLength) {
break;
}
if(titleStart<titleLimit) {
/* titlecase c which is from [titleStart..titleLimit[ */
csc->cpStart=titleStart;
csc->cpLimit=titleLimit;
c=ucase_toFullTitle(csp, c, utf16_caseContextIterator, csc, &s, locale, locCache);
destIndex=appendResult(dest, destIndex, destCapacity, c, s);
/* titlecase the character at the found index */
csc->cpStart=index;
U16_NEXT(src, index, srcLength, c);
csc->cpLimit=index;
c=ucase_toFullTitle(csp, c, utf16_caseContextIterator, csc, &s, locale, locCache);
destIndex=appendResult(dest, destIndex, destCapacity, c, s);
/* lowercase [titleLimit..index[ */
if(titleLimit<index) {
destIndex+=
_caseMap(
csp, ucase_toFullLower,
dest+destIndex, destCapacity-destIndex,
src, csc,
titleLimit, index,
locale, locCache,
pErrorCode);
}
}
}
prev=index;
}

3
icu4c/source/test/testdata/casing.txt vendored
View File

@ -1,6 +1,6 @@
//*******************************************************************************
//*
//* Copyright (C) 2002-2005, International Business Machines
//* Copyright (C) 2002-2006, International Business Machines
//* Corporation and others. All Rights Reserved.
//*
//*******************************************************************************
@ -36,6 +36,7 @@ casing:table(nofallback) {
titlecasing {
Headers { "Input", "Output", "Locale", "Type" }
Cases {
{ "ʻaMeLikA huI Pū ʻʻʻiA", "ʻAmelika Hui Pū ʻʻʻIa", "", "-1" }, // titlecase first _cased_ letter, j4933
{ " tHe QUIcK bRoWn", " The Quick Brown", "", "4" },
{ "DŽDždžLJLjljNJNjnj", "DžDžDžLjLjLjNjNjNj", "", "0" }, // UBRK_CHARACTER
{ "ljubav ljubav", "Ljubav Ljubav", "", "-1" }, // Lj vs. L+j