summaryrefslogtreecommitdiff
path: root/src/euc_tw.c
blob: 76833364cfa9a13c69f5de7fac5d0b3b9e03ea83 (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
/**********************************************************************
  euc_tw.c -  Oniguruma (regular expression library)
**********************************************************************/
/*-
 * Copyright (c) 2002-2018  K.Kosako  <sndgk393 AT ybb DOT ne DOT jp>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "regenc.h"

static const int EncLen_EUCTW[] = {
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
};

static int
euctw_mbc_enc_len(const UChar* p)
{
  return EncLen_EUCTW[*p];
}

static int
is_valid_mbc_string(const UChar* p, const UChar* end)
{
  while (p < end) {
    if (*p < 0x80) {
      p++;
    }
    else if (*p < 0xa1) {
      if (*p == 0x8e) {
	p++;
	if (p >= end) return FALSE;
	if (*p < 0xa1 || *p > 0xb0) return FALSE;
	p++;
	if (p >= end) return FALSE;
	if (*p < 0xa1 || *p == 0xff)
	  return FALSE;
	p++;
	if (p >= end) return FALSE;
	if (*p < 0xa1 || *p == 0xff)
	  return FALSE;
	p++;
      }
      else
	return FALSE;
    }
    else if (*p < 0xff) {
      p++;
      if (p >= end) return FALSE;
      if (*p < 0xa1 || *p == 0xff)
	return FALSE;
      p++;
    }
    else
      return FALSE;
  }

  return TRUE;
}

static OnigCodePoint
euctw_mbc_to_code(const UChar* p, const UChar* end)
{
  return onigenc_mbn_mbc_to_code(ONIG_ENCODING_EUC_TW, p, end);
}

static int
euctw_code_to_mbc(OnigCodePoint code, UChar *buf)
{
  return onigenc_mb4_code_to_mbc(ONIG_ENCODING_EUC_TW, code, buf);
}

static int
euctw_mbc_case_fold(OnigCaseFoldType flag, const UChar** pp, const UChar* end,
                    UChar* lower)
{
  return onigenc_mbn_mbc_case_fold(ONIG_ENCODING_EUC_TW, flag,
                                   pp, end, lower);
}

static int
euctw_is_code_ctype(OnigCodePoint code, unsigned int ctype)
{
  return onigenc_mb4_is_code_ctype(ONIG_ENCODING_EUC_TW, code, ctype);
}

#define euctw_islead(c)    ((UChar )((c) - 0xa1) > 0xfe - 0xa1)

static UChar*
euctw_left_adjust_char_head(const UChar* start, const UChar* s)
{
  /* Assumed in this encoding,
     mb-trail bytes don't mix with single bytes.
  */
  const UChar *p;
  int len;

  if (s <= start) return (UChar* )s;
  p = s;

  while (!euctw_islead(*p) && p > start) p--;
  len = enclen(ONIG_ENCODING_EUC_TW, p);
  if (p + len > s) return (UChar* )p;
  p += len;
  return (UChar* )(p + ((s - p) & ~1));
}

static int
euctw_is_allowed_reverse_match(const UChar* s, const UChar* end ARG_UNUSED)
{
  const UChar c = *s;
  if (c <= 0x7e) return TRUE;
  else           return FALSE;
}

OnigEncodingType OnigEncodingEUC_TW = {
  euctw_mbc_enc_len,
  "EUC-TW",   /* name */
  4,          /* max enc length */
  1,          /* min enc length */
  onigenc_is_mbc_newline_0x0a,
  euctw_mbc_to_code,
  onigenc_mb4_code_to_mbclen,
  euctw_code_to_mbc,
  euctw_mbc_case_fold,
  onigenc_ascii_apply_all_case_fold,
  onigenc_ascii_get_case_fold_codes_by_str,
  onigenc_minimum_property_name_to_ctype,
  euctw_is_code_ctype,
  onigenc_not_support_get_ctype_code_range,
  euctw_left_adjust_char_head,
  euctw_is_allowed_reverse_match,
  NULL, /* init */
  NULL, /* is_initialized */
  is_valid_mbc_string,
  ENC_FLAG_ASCII_COMPATIBLE|ENC_FLAG_SKIP_OFFSET_1,
  0, 0
};