intl/icu/source/i18n/titletrn.cpp@6474c204b198 (annotated)
intl/icu/source/i18n/titletrn.cpp
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* |
| michael@0 | 2 | ********************************************************************** |
| michael@0 | 3 | * Copyright (C) 2001-2011, International Business Machines |
| michael@0 | 4 | * Corporation and others. All Rights Reserved. |
| michael@0 | 5 | ********************************************************************** |
| michael@0 | 6 | * Date Name Description |
| michael@0 | 7 | * 05/24/01 aliu Creation. |
| michael@0 | 8 | ********************************************************************** |
| michael@0 | 9 | */ |
| michael@0 | 10 | |
| michael@0 | 11 | #include "unicode/utypes.h" |
| michael@0 | 12 | |
| michael@0 | 13 | #if !UCONFIG_NO_TRANSLITERATION |
| michael@0 | 14 | |
| michael@0 | 15 | #include "unicode/uchar.h" |
| michael@0 | 16 | #include "unicode/uniset.h" |
| michael@0 | 17 | #include "unicode/ustring.h" |
| michael@0 | 18 | #include "unicode/utf16.h" |
| michael@0 | 19 | #include "titletrn.h" |
| michael@0 | 20 | #include "umutex.h" |
| michael@0 | 21 | #include "ucase.h" |
| michael@0 | 22 | #include "cpputils.h" |
| michael@0 | 23 | |
| michael@0 | 24 | U_NAMESPACE_BEGIN |
| michael@0 | 25 | |
| michael@0 | 26 | UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TitlecaseTransliterator) |
| michael@0 | 27 | |
| michael@0 | 28 | TitlecaseTransliterator::TitlecaseTransliterator() : |
| michael@0 | 29 | CaseMapTransliterator(UNICODE_STRING("Any-Title", 9), NULL) |
| michael@0 | 30 | { |
| michael@0 | 31 | // Need to look back 2 characters in the case of "can't" |
| michael@0 | 32 | setMaximumContextLength(2); |
| michael@0 | 33 | } |
| michael@0 | 34 | |
| michael@0 | 35 | /** |
| michael@0 | 36 | * Destructor. |
| michael@0 | 37 | */ |
| michael@0 | 38 | TitlecaseTransliterator::~TitlecaseTransliterator() { |
| michael@0 | 39 | } |
| michael@0 | 40 | |
| michael@0 | 41 | /** |
| michael@0 | 42 | * Copy constructor. |
| michael@0 | 43 | */ |
| michael@0 | 44 | TitlecaseTransliterator::TitlecaseTransliterator(const TitlecaseTransliterator& o) : |
| michael@0 | 45 | CaseMapTransliterator(o) |
| michael@0 | 46 | { |
| michael@0 | 47 | } |
| michael@0 | 48 | |
| michael@0 | 49 | /** |
| michael@0 | 50 | * Assignment operator. |
| michael@0 | 51 | */ |
| michael@0 | 52 | /*TitlecaseTransliterator& TitlecaseTransliterator::operator=( |
| michael@0 | 53 | const TitlecaseTransliterator& o) { |
| michael@0 | 54 | CaseMapTransliterator::operator=(o); |
| michael@0 | 55 | return *this; |
| michael@0 | 56 | }*/ |
| michael@0 | 57 | |
| michael@0 | 58 | /** |
| michael@0 | 59 | * Transliterator API. |
| michael@0 | 60 | */ |
| michael@0 | 61 | Transliterator* TitlecaseTransliterator::clone(void) const { |
| michael@0 | 62 | return new TitlecaseTransliterator(*this); |
| michael@0 | 63 | } |
| michael@0 | 64 | |
| michael@0 | 65 | /** |
| michael@0 | 66 | * Implements {@link Transliterator#handleTransliterate}. |
| michael@0 | 67 | */ |
| michael@0 | 68 | void TitlecaseTransliterator::handleTransliterate( |
| michael@0 | 69 | Replaceable& text, UTransPosition& offsets, |
| michael@0 | 70 | UBool isIncremental) const |
| michael@0 | 71 | { |
| michael@0 | 72 | // TODO reimplement, see ustrcase.c |
| michael@0 | 73 | // using a real word break iterator |
| michael@0 | 74 | // instead of just looking for a transition between cased and uncased characters |
| michael@0 | 75 | // call CaseMapTransliterator::handleTransliterate() for lowercasing? (set fMap) |
| michael@0 | 76 | // needs to take isIncremental into account because case mappings are context-sensitive |
| michael@0 | 77 | // also detect when lowercasing function did not finish because of context |
| michael@0 | 78 | |
| michael@0 | 79 | if (offsets.start >= offsets.limit) { |
| michael@0 | 80 | return; |
| michael@0 | 81 | } |
| michael@0 | 82 | |
| michael@0 | 83 | // case type: >0 cased (UCASE_LOWER etc.) ==0 uncased <0 case-ignorable |
| michael@0 | 84 | int32_t type; |
| michael@0 | 85 | |
| michael@0 | 86 | // Our mode; we are either converting letter toTitle or |
| michael@0 | 87 | // toLower. |
| michael@0 | 88 | UBool doTitle = TRUE; |
| michael@0 | 89 | |
| michael@0 | 90 | // Determine if there is a preceding context of cased case-ignorable*, |
| michael@0 | 91 | // in which case we want to start in toLower mode. If the |
| michael@0 | 92 | // prior context is anything else (including empty) then start |
| michael@0 | 93 | // in toTitle mode. |
| michael@0 | 94 | UChar32 c; |
| michael@0 | 95 | int32_t start; |
| michael@0 | 96 | for (start = offsets.start - 1; start >= offsets.contextStart; start -= U16_LENGTH(c)) { |
| michael@0 | 97 | c = text.char32At(start); |
| michael@0 | 98 | type=ucase_getTypeOrIgnorable(fCsp, c); |
| michael@0 | 99 | if(type>0) { // cased |
| michael@0 | 100 | doTitle=FALSE; |
| michael@0 | 101 | break; |
| michael@0 | 102 | } else if(type==0) { // uncased but not ignorable |
| michael@0 | 103 | break; |
| michael@0 | 104 | } |
| michael@0 | 105 | // else (type<0) case-ignorable: continue |
| michael@0 | 106 | } |
| michael@0 | 107 | |
| michael@0 | 108 | // Convert things after a cased character toLower; things |
| michael@0 | 109 | // after an uncased, non-case-ignorable character toTitle. Case-ignorable |
| michael@0 | 110 | // characters are copied directly and do not change the mode. |
| michael@0 | 111 | UCaseContext csc; |
| michael@0 | 112 | uprv_memset(&csc, 0, sizeof(csc)); |
| michael@0 | 113 | csc.p = &text; |
| michael@0 | 114 | csc.start = offsets.contextStart; |
| michael@0 | 115 | csc.limit = offsets.contextLimit; |
| michael@0 | 116 | |
| michael@0 | 117 | UnicodeString tmp; |
| michael@0 | 118 | const UChar *s; |
| michael@0 | 119 | int32_t textPos, delta, result, locCache=0; |
| michael@0 | 120 | |
| michael@0 | 121 | for(textPos=offsets.start; textPos<offsets.limit;) { |
| michael@0 | 122 | csc.cpStart=textPos; |
| michael@0 | 123 | c=text.char32At(textPos); |
| michael@0 | 124 | csc.cpLimit=textPos+=U16_LENGTH(c); |
| michael@0 | 125 | |
| michael@0 | 126 | type=ucase_getTypeOrIgnorable(fCsp, c); |
| michael@0 | 127 | if(type>=0) { // not case-ignorable |
| michael@0 | 128 | if(doTitle) { |
| michael@0 | 129 | result=ucase_toFullTitle(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache); |
| michael@0 | 130 | } else { |
| michael@0 | 131 | result=ucase_toFullLower(fCsp, c, utrans_rep_caseContextIterator, &csc, &s, "", &locCache); |
| michael@0 | 132 | } |
| michael@0 | 133 | doTitle = (UBool)(type==0); // doTitle=isUncased |
| michael@0 | 134 | |
| michael@0 | 135 | if(csc.b1 && isIncremental) { |
| michael@0 | 136 | // fMap() tried to look beyond the context limit |
| michael@0 | 137 | // wait for more input |
| michael@0 | 138 | offsets.start=csc.cpStart; |
| michael@0 | 139 | return; |
| michael@0 | 140 | } |
| michael@0 | 141 | |
| michael@0 | 142 | if(result>=0) { |
| michael@0 | 143 | // replace the current code point with its full case mapping result |
| michael@0 | 144 | // see UCASE_MAX_STRING_LENGTH |
| michael@0 | 145 | if(result<=UCASE_MAX_STRING_LENGTH) { |
| michael@0 | 146 | // string s[result] |
| michael@0 | 147 | tmp.setTo(FALSE, s, result); |
| michael@0 | 148 | delta=result-U16_LENGTH(c); |
| michael@0 | 149 | } else { |
| michael@0 | 150 | // single code point |
| michael@0 | 151 | tmp.setTo(result); |
| michael@0 | 152 | delta=tmp.length()-U16_LENGTH(c); |
| michael@0 | 153 | } |
| michael@0 | 154 | text.handleReplaceBetween(csc.cpStart, textPos, tmp); |
| michael@0 | 155 | if(delta!=0) { |
| michael@0 | 156 | textPos+=delta; |
| michael@0 | 157 | csc.limit=offsets.contextLimit+=delta; |
| michael@0 | 158 | offsets.limit+=delta; |
| michael@0 | 159 | } |
| michael@0 | 160 | } |
| michael@0 | 161 | } |
| michael@0 | 162 | } |
| michael@0 | 163 | offsets.start=textPos; |
| michael@0 | 164 | } |
| michael@0 | 165 | |
| michael@0 | 166 | U_NAMESPACE_END |
| michael@0 | 167 | |
| michael@0 | 168 | #endif /* #if !UCONFIG_NO_TRANSLITERATION */ |
