1// © 2016 and later: Unicode, Inc. and others.
2// License & terms of use: http://www.unicode.org/copyright.html
3/*
4**********************************************************************
5* Copyright (C) 2001-2011, International Business Machines
6* Corporation and others. All Rights Reserved.
7**********************************************************************
8* Date Name Description
9* 06/06/01 aliu Creation.
10**********************************************************************
11*/
12
13#include "unicode/utypes.h"
14
15#if !UCONFIG_NO_TRANSLITERATION
16
17#include "unicode/unifilt.h"
18#include "unicode/uchar.h"
19#include "unicode/utf16.h"
20#include "uni2name.h"
21#include "cstring.h"
22#include "cmemory.h"
23#include "uprops.h"
24
25U_NAMESPACE_BEGIN
26
27UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeNameTransliterator)
28
29static const UChar OPEN_DELIM[] = {92,78,123,0}; // "\N{"
30static const UChar CLOSE_DELIM = 125; // "}"
31#define OPEN_DELIM_LEN 3
32
33/**
34 * Constructs a transliterator.
35 */
36UnicodeNameTransliterator::UnicodeNameTransliterator(UnicodeFilter* adoptedFilter) :
37 Transliterator(UNICODE_STRING("Any-Name", 8), adoptedFilter) {
38}
39
40/**
41 * Destructor.
42 */
43UnicodeNameTransliterator::~UnicodeNameTransliterator() {}
44
45/**
46 * Copy constructor.
47 */
48UnicodeNameTransliterator::UnicodeNameTransliterator(const UnicodeNameTransliterator& o) :
49 Transliterator(o) {}
50
51/**
52 * Assignment operator.
53 */
54/*UnicodeNameTransliterator& UnicodeNameTransliterator::operator=(
55 const UnicodeNameTransliterator& o) {
56 Transliterator::operator=(o);
57 return *this;
58}*/
59
60/**
61 * Transliterator API.
62 */
63UnicodeNameTransliterator* UnicodeNameTransliterator::clone() const {
64 return new UnicodeNameTransliterator(*this);
65}
66
67/**
68 * Implements {@link Transliterator#handleTransliterate}.
69 * Ignore isIncremental since we don't need the context, and
70 * we work on codepoints.
71 */
72void UnicodeNameTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
73 UBool /*isIncremental*/) const {
74 // The failure mode, here and below, is to behave like Any-Null,
75 // if either there is no name data (max len == 0) or there is no
76 // memory (malloc() => NULL).
77
78 int32_t maxLen = uprv_getMaxCharNameLength();
79 if (maxLen == 0) {
80 offsets.start = offsets.limit;
81 return;
82 }
83
84 // Accomodate the longest possible name plus padding
85 char* buf = (char*) uprv_malloc(maxLen);
86 if (buf == NULL) {
87 offsets.start = offsets.limit;
88 return;
89 }
90
91 int32_t cursor = offsets.start;
92 int32_t limit = offsets.limit;
93
94 UnicodeString str(FALSE, OPEN_DELIM, OPEN_DELIM_LEN);
95 UErrorCode status;
96 int32_t len;
97
98 while (cursor < limit) {
99 UChar32 c = text.char32At(cursor);
100 int32_t clen = U16_LENGTH(c);
101 status = U_ZERO_ERROR;
102 if ((len = u_charName(c, U_EXTENDED_CHAR_NAME, buf, maxLen, &status)) >0 && !U_FAILURE(status)) {
103 str.truncate(OPEN_DELIM_LEN);
104 str.append(UnicodeString(buf, len, US_INV)).append(CLOSE_DELIM);
105 text.handleReplaceBetween(cursor, cursor+clen, str);
106 len += OPEN_DELIM_LEN + 1; // adjust for delimiters
107 cursor += len; // advance cursor and adjust for new text
108 limit += len-clen; // change in length
109 } else {
110 cursor += clen;
111 }
112 }
113
114 offsets.contextLimit += limit - offsets.limit;
115 offsets.limit = limit;
116 offsets.start = cursor;
117
118 uprv_free(buf);
119}
120
121U_NAMESPACE_END
122
123#endif /* #if !UCONFIG_NO_TRANSLITERATION */
124