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
23 U_NAMESPACE_BEGIN
24
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TitlecaseTransliterator)25 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TitlecaseTransliterator)
26
27 TitlecaseTransliterator::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 */
~TitlecaseTransliterator()37 TitlecaseTransliterator::~TitlecaseTransliterator() {
38 }
39
40 /**
41 * Copy constructor.
42 */
TitlecaseTransliterator(const TitlecaseTransliterator & o)43 TitlecaseTransliterator::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 */
clone(void) const60 Transliterator* TitlecaseTransliterator::clone(void) const {
61 return new TitlecaseTransliterator(*this);
62 }
63
64 /**
65 * Implements {@link Transliterator#handleTransliterate}.
66 */
handleTransliterate(Replaceable & text,UTransPosition & offsets,UBool isIncremental) const67 void 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
165 U_NAMESPACE_END
166
167 #endif /* #if !UCONFIG_NO_TRANSLITERATION */
168