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
22U_NAMESPACE_BEGIN
23
24UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnicodeNameTransliterator)
25
26static const UChar OPEN_DELIM[] = {92,78,123,0}; // "\N{"
27static const UChar CLOSE_DELIM  = 125; // "}"
28#define OPEN_DELIM_LEN 3
29
30/**
31 * Constructs a transliterator.
32 */
33UnicodeNameTransliterator::UnicodeNameTransliterator(UnicodeFilter* adoptedFilter) :
34    Transliterator(UNICODE_STRING("Any-Name", 8), adoptedFilter) {
35}
36
37/**
38 * Destructor.
39 */
40UnicodeNameTransliterator::~UnicodeNameTransliterator() {}
41
42/**
43 * Copy constructor.
44 */
45UnicodeNameTransliterator::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 */
60Transliterator* 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 */
69void 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
118U_NAMESPACE_END
119
120#endif /* #if !UCONFIG_NO_TRANSLITERATION */
121