1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
**********************************************************************
* Copyright (C) 2001-2011, 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 "unicode/utf16.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), nullptr)
{
// 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.
*/
TitlecaseTransliterator* TitlecaseTransliterator::clone() 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(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 char16_t *s;
int32_t textPos, delta, result;
for(textPos=offsets.start; textPos<offsets.limit;) {
csc.cpStart=textPos;
c=text.char32At(textPos);
csc.cpLimit=textPos+=U16_LENGTH(c);
type=ucase_getTypeOrIgnorable(c);
if(type>=0) { // not case-ignorable
if(doTitle) {
result=ucase_toFullTitle(c, utrans_rep_caseContextIterator, &csc, &s, UCASE_LOC_ROOT);
} else {
result=ucase_toFullLower(c, utrans_rep_caseContextIterator, &csc, &s, UCASE_LOC_ROOT);
}
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 */
|
