1 /*
2 **********************************************************************
3 * Copyright (C) 2001-2011, 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 "unicode/utf16.h"
18 #include "uni2name.h"
19 #include "cstring.h"
20 #include "cmemory.h"
21 #include "uprops.h"
22
23 U_NAMESPACE_BEGIN
24
25 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeNameTransliterator)
26
27 static const UChar OPEN_DELIM[] = {92,78,123,0}; // "\N{"
28 static const UChar CLOSE_DELIM = 125; // "}"
29 #define OPEN_DELIM_LEN 3
30
31 /**
32 * Constructs a transliterator.
33 */
UnicodeNameTransliterator(UnicodeFilter * adoptedFilter)34 UnicodeNameTransliterator::UnicodeNameTransliterator(UnicodeFilter* adoptedFilter) :
35 Transliterator(UNICODE_STRING("Any-Name", 8), adoptedFilter) {
36 }
37
38 /**
39 * Destructor.
40 */
~UnicodeNameTransliterator()41 UnicodeNameTransliterator::~UnicodeNameTransliterator() {}
42
43 /**
44 * Copy constructor.
45 */
UnicodeNameTransliterator(const UnicodeNameTransliterator & o)46 UnicodeNameTransliterator::UnicodeNameTransliterator(const UnicodeNameTransliterator& o) :
47 Transliterator(o) {}
48
49 /**
50 * Assignment operator.
51 */
52 /*UnicodeNameTransliterator& UnicodeNameTransliterator::operator=(
53 const UnicodeNameTransliterator& o) {
54 Transliterator::operator=(o);
55 return *this;
56 }*/
57
58 /**
59 * Transliterator API.
60 */
clone(void) const61 Transliterator* UnicodeNameTransliterator::clone(void) const {
62 return new UnicodeNameTransliterator(*this);
63 }
64
65 /**
66 * Implements {@link Transliterator#handleTransliterate}.
67 * Ignore isIncremental since we don't need the context, and
68 * we work on codepoints.
69 */
handleTransliterate(Replaceable & text,UTransPosition & offsets,UBool) const70 void UnicodeNameTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
71 UBool /*isIncremental*/) const {
72 // The failure mode, here and below, is to behave like Any-Null,
73 // if either there is no name data (max len == 0) or there is no
74 // memory (malloc() => NULL).
75
76 int32_t maxLen = uprv_getMaxCharNameLength();
77 if (maxLen == 0) {
78 offsets.start = offsets.limit;
79 return;
80 }
81
82 // Accomodate the longest possible name plus padding
83 char* buf = (char*) uprv_malloc(maxLen);
84 if (buf == NULL) {
85 offsets.start = offsets.limit;
86 return;
87 }
88
89 int32_t cursor = offsets.start;
90 int32_t limit = offsets.limit;
91
92 UnicodeString str(FALSE, OPEN_DELIM, OPEN_DELIM_LEN);
93 UErrorCode status;
94 int32_t len;
95
96 while (cursor < limit) {
97 UChar32 c = text.char32At(cursor);
98 int32_t clen = U16_LENGTH(c);
99 status = U_ZERO_ERROR;
100 if ((len = u_charName(c, U_EXTENDED_CHAR_NAME, buf, maxLen, &status)) >0 && !U_FAILURE(status)) {
101 str.truncate(OPEN_DELIM_LEN);
102 str.append(UnicodeString(buf, len, US_INV)).append(CLOSE_DELIM);
103 text.handleReplaceBetween(cursor, cursor+clen, str);
104 len += OPEN_DELIM_LEN + 1; // adjust for delimiters
105 cursor += len; // advance cursor and adjust for new text
106 limit += len-clen; // change in length
107 } else {
108 cursor += clen;
109 }
110 }
111
112 offsets.contextLimit += limit - offsets.limit;
113 offsets.limit = limit;
114 offsets.start = cursor;
115
116 uprv_free(buf);
117 }
118
119 U_NAMESPACE_END
120
121 #endif /* #if !UCONFIG_NO_TRANSLITERATION */
122