1 /*
2 **********************************************************************
3 * Copyright (C) 2001-2007, International Business Machines
4 * Corporation and others. All Rights Reserved.
5 **********************************************************************
6 * Date Name Description
7 * 06/06/01 aliu Creation.
8 **********************************************************************
9 */
10
11 #include "unicode/utypes.h"
12
13 #if !UCONFIG_NO_TRANSLITERATION
14
15 #include "unicode/unifilt.h"
16 #include "unicode/uchar.h"
17 #include "uni2name.h"
18 #include "cstring.h"
19 #include "cmemory.h"
20 #include "uprops.h"
21
22 U_NAMESPACE_BEGIN
23
24 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeNameTransliterator)
25
26 static const UChar OPEN_DELIM[] = {92,78,123,0}; // "\N{"
27 static const UChar CLOSE_DELIM = 125; // "}"
28 #define OPEN_DELIM_LEN 3
29
30 /**
31 * Constructs a transliterator.
32 */
UnicodeNameTransliterator(UnicodeFilter * adoptedFilter)33 UnicodeNameTransliterator::UnicodeNameTransliterator(UnicodeFilter* adoptedFilter) :
34 Transliterator(UNICODE_STRING("Any-Name", 8), adoptedFilter) {
35 }
36
37 /**
38 * Destructor.
39 */
~UnicodeNameTransliterator()40 UnicodeNameTransliterator::~UnicodeNameTransliterator() {}
41
42 /**
43 * Copy constructor.
44 */
UnicodeNameTransliterator(const UnicodeNameTransliterator & o)45 UnicodeNameTransliterator::UnicodeNameTransliterator(const UnicodeNameTransliterator& o) :
46 Transliterator(o) {}
47
48 /**
49 * Assignment operator.
50 */
51 /*UnicodeNameTransliterator& UnicodeNameTransliterator::operator=(
52 const UnicodeNameTransliterator& o) {
53 Transliterator::operator=(o);
54 return *this;
55 }*/
56
57 /**
58 * Transliterator API.
59 */
clone(void) const60 Transliterator* UnicodeNameTransliterator::clone(void) const {
61 return new UnicodeNameTransliterator(*this);
62 }
63
64 /**
65 * Implements {@link Transliterator#handleTransliterate}.
66 * Ignore isIncremental since we don't need the context, and
67 * we work on codepoints.
68 */
handleTransliterate(Replaceable & text,UTransPosition & offsets,UBool) const69 void UnicodeNameTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
70 UBool /*isIncremental*/) const {
71 // The failure mode, here and below, is to behave like Any-Null,
72 // if either there is no name data (max len == 0) or there is no
73 // memory (malloc() => NULL).
74
75 int32_t maxLen = uprv_getMaxCharNameLength();
76 if (maxLen == 0) {
77 offsets.start = offsets.limit;
78 return;
79 }
80
81 // Accomodate the longest possible name plus padding
82 char* buf = (char*) uprv_malloc(maxLen);
83 if (buf == NULL) {
84 offsets.start = offsets.limit;
85 return;
86 }
87
88 int32_t cursor = offsets.start;
89 int32_t limit = offsets.limit;
90
91 UnicodeString str(FALSE, OPEN_DELIM, OPEN_DELIM_LEN);
92 UErrorCode status;
93 int32_t len;
94
95 while (cursor < limit) {
96 UChar32 c = text.char32At(cursor);
97 int32_t clen = UTF_CHAR_LENGTH(c);
98 status = U_ZERO_ERROR;
99 if ((len = u_charName(c, U_EXTENDED_CHAR_NAME, buf, maxLen, &status)) >0 && !U_FAILURE(status)) {
100 str.truncate(OPEN_DELIM_LEN);
101 str.append(UnicodeString(buf, len, US_INV)).append(CLOSE_DELIM);
102 text.handleReplaceBetween(cursor, cursor+clen, str);
103 len += OPEN_DELIM_LEN + 1; // adjust for delimiters
104 cursor += len; // advance cursor and adjust for new text
105 limit += len-clen; // change in length
106 } else {
107 cursor += clen;
108 }
109 }
110
111 offsets.contextLimit += limit - offsets.limit;
112 offsets.limit = limit;
113 offsets.start = cursor;
114
115 uprv_free(buf);
116 }
117
118 U_NAMESPACE_END
119
120 #endif /* #if !UCONFIG_NO_TRANSLITERATION */
121