| /* |
| ********************************************************************** |
| * Copyright (C) 2001-2007, 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 "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 */ |