1/* 2********************************************************************** 3* Copyright (C) 2001-2007, International Business Machines 4* Corporation and others. All Rights Reserved. 5********************************************************************** 6* Date Name Description 7* 05/24/01 aliu Creation. 8********************************************************************** 9*/ 10 11#include "unicode/utypes.h" 12 13#if !UCONFIG_NO_TRANSLITERATION 14 15#include "unicode/uchar.h" 16#include "unicode/uniset.h" 17#include "unicode/ustring.h" 18#include "titletrn.h" 19#include "umutex.h" 20#include "ucase.h" 21#include "cpputils.h" 22 23U_NAMESPACE_BEGIN 24 25UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TitlecaseTransliterator) 26 27TitlecaseTransliterator::TitlecaseTransliterator() : 28 CaseMapTransliterator(UNICODE_STRING("Any-Title", 9), NULL) 29{ 30 // Need to look back 2 characters in the case of "can't" 31 setMaximumContextLength(2); 32} 33 34/** 35 * Destructor. 36 */ 37TitlecaseTransliterator::~TitlecaseTransliterator() { 38} 39 40/** 41 * Copy constructor. 42 */ 43TitlecaseTransliterator::TitlecaseTransliterator(const TitlecaseTransliterator& o) : 44 CaseMapTransliterator(o) 45{ 46} 47 48/** 49 * Assignment operator. 50 */ 51/*TitlecaseTransliterator& TitlecaseTransliterator::operator=( 52 const TitlecaseTransliterator& o) { 53 CaseMapTransliterator::operator=(o); 54 return *this; 55}*/ 56 57/** 58 * Transliterator API. 59 */ 60Transliterator* TitlecaseTransliterator::clone(void) const { 61 return new TitlecaseTransliterator(*this); 62} 63 64/** 65 * Implements {@link Transliterator#handleTransliterate}. 66 */ 67void TitlecaseTransliterator::handleTransliterate( 68 Replaceable& text, UTransPosition& offsets, 69 UBool isIncremental) const 70{ 71 // TODO reimplement, see ustrcase.c 72 // using a real word break iterator 73 // instead of just looking for a transition between cased and uncased characters 74 // call CaseMapTransliterator::handleTransliterate() for lowercasing? (set fMap) 75 // needs to take isIncremental into account because case mappings are context-sensitive 76 // also detect when lowercasing function did not finish because of context 77 78 if (offsets.start >= offsets.limit) { 79 return; 80 } 81 82 // case type: >0 cased (UCASE_LOWER etc.) ==0 uncased <0 case-ignorable 83 int32_t type; 84 85 // Our mode; we are either converting letter toTitle or 86 // toLower. 87 UBool doTitle = TRUE; 88 89 // Determine if there is a preceding context of cased case-ignorable*, 90 // in which case we want to start in toLower mode. If the 91 // prior context is anything else (including empty) then start 92 // in toTitle mode. 93 UChar32 c; 94 int32_t start; 95 for (start = offsets.start - 1; start >= offsets.contextStart; start -= U16_LENGTH(c)) { 96 c = text.char32At(start); 97 type=ucase_getTypeOrIgnorable(fCsp, c); 98 if(type>0) { // cased 99 doTitle=FALSE; 100 break; 101 } else if(type==0) { // uncased but not ignorable 102 break; 103 } 104 // else (type<0) case-ignorable: continue 105 } 106 107 // Convert things after a cased character toLower; things 108 // after an uncased, non-case-ignorable character toTitle. Case-ignorable 109 // characters are copied directly and do not change the mode. 110 UCaseContext csc; 111 uprv_memset(&csc, 0, sizeof(csc)); 112 csc.p = &text; 113 csc.start = offsets.contextStart; 114 csc.limit = offsets.contextLimit; 115 116 UnicodeString tmp; 117 const UChar *s; 118 int32_t textPos, delta, result, locCache=0; 119 120 for(textPos=offsets.start; textPos<offsets.limit;) { 121 csc.cpStart=textPos; 122 c=text.char32At(textPos); 123 csc.cpLimit=textPos+=U16_LENGTH(c); 124 125 type=ucase_getTypeOrIgnorable(fCsp, c); 126 if(type>=0) { // not case-ignorable 127 if(doTitle) { 128 result=ucase_toFullTitle(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache); 129 } else { 130 result=ucase_toFullLower(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache); 131 } 132 doTitle = (UBool)(type==0); // doTitle=isUncased 133 134 if(csc.b1 && isIncremental) { 135 // fMap() tried to look beyond the context limit 136 // wait for more input 137 offsets.start=csc.cpStart; 138 return; 139 } 140 141 if(result>=0) { 142 // replace the current code point with its full case mapping result 143 // see UCASE_MAX_STRING_LENGTH 144 if(result<=UCASE_MAX_STRING_LENGTH) { 145 // string s[result] 146 tmp.setTo(FALSE, s, result); 147 delta=result-U16_LENGTH(c); 148 } else { 149 // single code point 150 tmp.setTo(result); 151 delta=tmp.length()-U16_LENGTH(c); 152 } 153 text.handleReplaceBetween(csc.cpStart, textPos, tmp); 154 if(delta!=0) { 155 textPos+=delta; 156 csc.limit=offsets.contextLimit+=delta; 157 offsets.limit+=delta; 158 } 159 } 160 } 161 } 162 offsets.start=textPos; 163} 164 165U_NAMESPACE_END 166 167#endif /* #if !UCONFIG_NO_TRANSLITERATION */ 168