summaryrefslogtreecommitdiffstats
path: root/intl/icu/source/i18n/esctrn.cpp
blob: 9be926f138c7f1daa01bca130127cd43fcb71c93 (plain)
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
171
172
173
174
175
176
177
178
179
180
181
// Copyright (C) 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
*   11/19/2001  aliu        Creation.
**********************************************************************
*/

#include "unicode/utypes.h"

#if !UCONFIG_NO_TRANSLITERATION

#include "unicode/utf16.h"
#include "esctrn.h"
#include "util.h"

U_NAMESPACE_BEGIN

static const UChar UNIPRE[] = {85,43,0}; // "U+"
static const UChar BS_u[] = {92,117,0}; // "\\u"
static const UChar BS_U[] = {92,85,0}; // "\\U"
static const UChar XMLPRE[] = {38,35,120,0}; // "&#x"
static const UChar XML10PRE[] = {38,35,0}; // "&#"
static const UChar PERLPRE[] = {92,120,123,0}; // "\\x{"
static const UChar SEMI[] = {59,0}; // ";"
static const UChar RBRACE[] = {125,0}; // "}"

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(EscapeTransliterator)

/**
 * Factory methods
 */
static Transliterator* _createEscUnicode(const UnicodeString& ID, Transliterator::Token /*context*/) {
    // Unicode: "U+10FFFF" hex, min=4, max=6
    return new EscapeTransliterator(ID, UnicodeString(TRUE, UNIPRE, 2), UnicodeString(), 16, 4, TRUE, NULL);
}
static Transliterator* _createEscJava(const UnicodeString& ID, Transliterator::Token /*context*/) {
    // Java: "\\uFFFF" hex, min=4, max=4
    return new EscapeTransliterator(ID, UnicodeString(TRUE, BS_u, 2), UnicodeString(), 16, 4, FALSE, NULL);
}
static Transliterator* _createEscC(const UnicodeString& ID, Transliterator::Token /*context*/) {
    // C: "\\uFFFF" hex, min=4, max=4; \\U0010FFFF hex, min=8, max=8
    return new EscapeTransliterator(ID, UnicodeString(TRUE, BS_u, 2), UnicodeString(), 16, 4, TRUE,
             new EscapeTransliterator(UnicodeString(), UnicodeString(TRUE, BS_U, 2), UnicodeString(), 16, 8, TRUE, NULL));
}
static Transliterator* _createEscXML(const UnicodeString& ID, Transliterator::Token /*context*/) {
    // XML: "" hex, min=1, max=6
    return new EscapeTransliterator(ID, UnicodeString(TRUE, XMLPRE, 3), UnicodeString(SEMI[0]), 16, 1, TRUE, NULL);
}
static Transliterator* _createEscXML10(const UnicodeString& ID, Transliterator::Token /*context*/) {
    // XML10: "&1114111;" dec, min=1, max=7 (not really "Any-Hex")
    return new EscapeTransliterator(ID, UnicodeString(TRUE, XML10PRE, 2), UnicodeString(SEMI[0]), 10, 1, TRUE, NULL);
}
static Transliterator* _createEscPerl(const UnicodeString& ID, Transliterator::Token /*context*/) {
    // Perl: "\\x{263A}" hex, min=1, max=6
    return new EscapeTransliterator(ID, UnicodeString(TRUE, PERLPRE, 3), UnicodeString(RBRACE[0]), 16, 1, TRUE, NULL);
}

/**
 * Registers standard variants with the system.  Called by
 * Transliterator during initialization.
 */
void EscapeTransliterator::registerIDs() {
    Token t = integerToken(0);

    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/Unicode"), _createEscUnicode, t);

    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/Java"), _createEscJava, t);

    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/C"), _createEscC, t);

    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/XML"), _createEscXML, t);

    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/XML10"), _createEscXML10, t);

    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex/Perl"), _createEscPerl, t);

    Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Any-Hex"), _createEscJava, t);
}

/**
 * Constructs an escape transliterator with the given ID and
 * parameters.  See the class member documentation for details.
 */
EscapeTransliterator::EscapeTransliterator(const UnicodeString& newID,
                         const UnicodeString& _prefix, const UnicodeString& _suffix,
                         int32_t _radix, int32_t _minDigits,
                         UBool _grokSupplementals,
                         EscapeTransliterator* adoptedSupplementalHandler) :
    Transliterator(newID, NULL)
{
    this->prefix = _prefix;
    this->suffix = _suffix;
    this->radix = _radix;
    this->minDigits = _minDigits;
    this->grokSupplementals = _grokSupplementals;
    this->supplementalHandler = adoptedSupplementalHandler;
}

/**
 * Copy constructor.
 */
EscapeTransliterator::EscapeTransliterator(const EscapeTransliterator& o) :
    Transliterator(o),
    prefix(o.prefix),
    suffix(o.suffix),
    radix(o.radix),
    minDigits(o.minDigits),
    grokSupplementals(o.grokSupplementals) {
    supplementalHandler = (o.supplementalHandler != 0) ?
        new EscapeTransliterator(*o.supplementalHandler) : NULL;
}

EscapeTransliterator::~EscapeTransliterator() {
    delete supplementalHandler;
}

/**
 * Transliterator API.
 */
Transliterator* EscapeTransliterator::clone() const {
    return new EscapeTransliterator(*this);
}

/**
 * Implements {@link Transliterator#handleTransliterate}.
 */
void EscapeTransliterator::handleTransliterate(Replaceable& text,
                                               UTransPosition& pos,
                                               UBool /*isIncremental*/) const
{
    /* TODO: Verify that isIncremental can be ignored */
    int32_t start = pos.start;
    int32_t limit = pos.limit;

    UnicodeString buf(prefix);
    int32_t prefixLen = prefix.length();
    UBool redoPrefix = FALSE;

    while (start < limit) {
        int32_t c = grokSupplementals ? text.char32At(start) : text.charAt(start);
        int32_t charLen = grokSupplementals ? U16_LENGTH(c) : 1;

        if ((c & 0xFFFF0000) != 0 && supplementalHandler != NULL) {
            buf.truncate(0);
            buf.append(supplementalHandler->prefix);
            ICU_Utility::appendNumber(buf, c, supplementalHandler->radix,
                                  supplementalHandler->minDigits);
            buf.append(supplementalHandler->suffix);
            redoPrefix = TRUE;
        } else {
            if (redoPrefix) {
                buf.truncate(0);
                buf.append(prefix);
                redoPrefix = FALSE;
            } else {
                buf.truncate(prefixLen);
            }
            ICU_Utility::appendNumber(buf, c, radix, minDigits);
            buf.append(suffix);
        }

        text.handleReplaceBetween(start, start + charLen, buf);
        start += buf.length();
        limit += buf.length() - charLen;
    }

    pos.contextLimit += limit - pos.limit;
    pos.limit = limit;
    pos.start = start;
}

U_NAMESPACE_END

#endif /* #if !UCONFIG_NO_TRANSLITERATION */

//eof