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comparison: intl/icu/source/i18n/titletrn.cpp
intl/icu/source/i18n/titletrn.cpp
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- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
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| -1:000000000000 | 0:946d2fe4af3f |
|---|---|
| 1 /* | |
| 2 ********************************************************************** | |
| 3 * Copyright (C) 2001-2011, 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 "unicode/utf16.h" | |
| 19 #include "titletrn.h" | |
| 20 #include "umutex.h" | |
| 21 #include "ucase.h" | |
| 22 #include "cpputils.h" | |
| 23 | |
| 24 U_NAMESPACE_BEGIN | |
| 25 | |
| 26 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TitlecaseTransliterator) | |
| 27 | |
| 28 TitlecaseTransliterator::TitlecaseTransliterator() : | |
| 29 CaseMapTransliterator(UNICODE_STRING("Any-Title", 9), NULL) | |
| 30 { | |
| 31 // Need to look back 2 characters in the case of "can't" | |
| 32 setMaximumContextLength(2); | |
| 33 } | |
| 34 | |
| 35 /** | |
| 36 * Destructor. | |
| 37 */ | |
| 38 TitlecaseTransliterator::~TitlecaseTransliterator() { | |
| 39 } | |
| 40 | |
| 41 /** | |
| 42 * Copy constructor. | |
| 43 */ | |
| 44 TitlecaseTransliterator::TitlecaseTransliterator(const TitlecaseTransliterator& o) : | |
| 45 CaseMapTransliterator(o) | |
| 46 { | |
| 47 } | |
| 48 | |
| 49 /** | |
| 50 * Assignment operator. | |
| 51 */ | |
| 52 /*TitlecaseTransliterator& TitlecaseTransliterator::operator=( | |
| 53 const TitlecaseTransliterator& o) { | |
| 54 CaseMapTransliterator::operator=(o); | |
| 55 return *this; | |
| 56 }*/ | |
| 57 | |
| 58 /** | |
| 59 * Transliterator API. | |
| 60 */ | |
| 61 Transliterator* TitlecaseTransliterator::clone(void) const { | |
| 62 return new TitlecaseTransliterator(*this); | |
| 63 } | |
| 64 | |
| 65 /** | |
| 66 * Implements {@link Transliterator#handleTransliterate}. | |
| 67 */ | |
| 68 void TitlecaseTransliterator::handleTransliterate( | |
| 69 Replaceable& text, UTransPosition& offsets, | |
| 70 UBool isIncremental) const | |
| 71 { | |
| 72 // TODO reimplement, see ustrcase.c | |
| 73 // using a real word break iterator | |
| 74 // instead of just looking for a transition between cased and uncased characters | |
| 75 // call CaseMapTransliterator::handleTransliterate() for lowercasing? (set fMap) | |
| 76 // needs to take isIncremental into account because case mappings are context-sensitive | |
| 77 // also detect when lowercasing function did not finish because of context | |
| 78 | |
| 79 if (offsets.start >= offsets.limit) { | |
| 80 return; | |
| 81 } | |
| 82 | |
| 83 // case type: >0 cased (UCASE_LOWER etc.) ==0 uncased <0 case-ignorable | |
| 84 int32_t type; | |
| 85 | |
| 86 // Our mode; we are either converting letter toTitle or | |
| 87 // toLower. | |
| 88 UBool doTitle = TRUE; | |
| 89 | |
| 90 // Determine if there is a preceding context of cased case-ignorable*, | |
| 91 // in which case we want to start in toLower mode. If the | |
| 92 // prior context is anything else (including empty) then start | |
| 93 // in toTitle mode. | |
| 94 UChar32 c; | |
| 95 int32_t start; | |
| 96 for (start = offsets.start - 1; start >= offsets.contextStart; start -= U16_LENGTH(c)) { | |
| 97 c = text.char32At(start); | |
| 98 type=ucase_getTypeOrIgnorable(fCsp, c); | |
| 99 if(type>0) { // cased | |
| 100 doTitle=FALSE; | |
| 101 break; | |
| 102 } else if(type==0) { // uncased but not ignorable | |
| 103 break; | |
| 104 } | |
| 105 // else (type<0) case-ignorable: continue | |
| 106 } | |
| 107 | |
| 108 // Convert things after a cased character toLower; things | |
| 109 // after an uncased, non-case-ignorable character toTitle. Case-ignorable | |
| 110 // characters are copied directly and do not change the mode. | |
| 111 UCaseContext csc; | |
| 112 uprv_memset(&csc, 0, sizeof(csc)); | |
| 113 csc.p = &text; | |
| 114 csc.start = offsets.contextStart; | |
| 115 csc.limit = offsets.contextLimit; | |
| 116 | |
| 117 UnicodeString tmp; | |
| 118 const UChar *s; | |
| 119 int32_t textPos, delta, result, locCache=0; | |
| 120 | |
| 121 for(textPos=offsets.start; textPos<offsets.limit;) { | |
| 122 csc.cpStart=textPos; | |
| 123 c=text.char32At(textPos); | |
| 124 csc.cpLimit=textPos+=U16_LENGTH(c); | |
| 125 | |
| 126 type=ucase_getTypeOrIgnorable(fCsp, c); | |
| 127 if(type>=0) { // not case-ignorable | |
| 128 if(doTitle) { | |
| 129 result=ucase_toFullTitle(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache); | |
| 130 } else { | |
| 131 result=ucase_toFullLower(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache); | |
| 132 } | |
| 133 doTitle = (UBool)(type==0); // doTitle=isUncased | |
| 134 | |
| 135 if(csc.b1 && isIncremental) { | |
| 136 // fMap() tried to look beyond the context limit | |
| 137 // wait for more input | |
| 138 offsets.start=csc.cpStart; | |
| 139 return; | |
| 140 } | |
| 141 | |
| 142 if(result>=0) { | |
| 143 // replace the current code point with its full case mapping result | |
| 144 // see UCASE_MAX_STRING_LENGTH | |
| 145 if(result<=UCASE_MAX_STRING_LENGTH) { | |
| 146 // string s[result] | |
| 147 tmp.setTo(FALSE, s, result); | |
| 148 delta=result-U16_LENGTH(c); | |
| 149 } else { | |
| 150 // single code point | |
| 151 tmp.setTo(result); | |
| 152 delta=tmp.length()-U16_LENGTH(c); | |
| 153 } | |
| 154 text.handleReplaceBetween(csc.cpStart, textPos, tmp); | |
| 155 if(delta!=0) { | |
| 156 textPos+=delta; | |
| 157 csc.limit=offsets.contextLimit+=delta; | |
| 158 offsets.limit+=delta; | |
| 159 } | |
| 160 } | |
| 161 } | |
| 162 } | |
| 163 offsets.start=textPos; | |
| 164 } | |
| 165 | |
| 166 U_NAMESPACE_END | |
| 167 | |
| 168 #endif /* #if !UCONFIG_NO_TRANSLITERATION */ |
