summaryrefslogtreecommitdiffstats
path: root/euc_jp.c
blob: 65729feda8fd2b0ae5999fc348069b35f052ace4 (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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
/**********************************************************************
  euc_jp.c -  Oniguruma (regular expression library)
**********************************************************************/
/*-
 * Copyright (c) 2002-2007  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 "regint.h"

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

static const int EncLen_EUCJP[] = {
  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, 2, 3,
  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
mbc_enc_len(const UChar* p)
{
  return EncLen_EUCJP[*p];
}

static OnigCodePoint
mbc_to_code(const UChar* p, const UChar* end)
{
  int c, i, len;
  OnigCodePoint n;

  len = enc_len(ONIG_ENCODING_EUC_JP, p);
  n = (OnigCodePoint )*p++;
  if (len == 1) return n;

  for (i = 1; i < len; i++) {
    if (p >= end) break;
    c = *p++;
    n <<= 8;  n += c;
  }
  return n;
}

static int
code_to_mbclen(OnigCodePoint code)
{
  if (ONIGENC_IS_CODE_ASCII(code)) return 1;
  else if ((code & 0xff0000) != 0) return 3;
  else if ((code &   0xff00) != 0) return 2;
  else return 0;
}

#if 0
static int
code_to_mbc_first(OnigCodePoint code)
{
  int first;

  if ((code & 0xff0000) != 0) {
    first = (code >> 16) & 0xff;
  }
  else if ((code & 0xff00) != 0) {
    first = (code >> 8) & 0xff;
  }
  else {
    return (int )code;
  }
  return first;
}
#endif

static int
code_to_mbc(OnigCodePoint code, UChar *buf)
{
  UChar *p = buf;

  if ((code & 0xff0000) != 0) *p++ = (UChar )(((code >> 16) & 0xff));
  if ((code &   0xff00) != 0) *p++ = (UChar )(((code >>  8) & 0xff));
  *p++ = (UChar )(code & 0xff);

#if 1
  if (enc_len(ONIG_ENCODING_EUC_JP, buf) != (p - buf))
    return ONIGENC_ERR_INVALID_WIDE_CHAR_VALUE;
#endif  
  return p - buf;
}

static int
mbc_case_fold(OnigCaseFoldType flag,
	      const UChar** pp, const UChar* end, UChar* lower)
{
  int len;
  const UChar* p = *pp;

  if (ONIGENC_IS_MBC_ASCII(p)) {
    *lower = ONIGENC_ASCII_CODE_TO_LOWER_CASE(*p);
    (*pp)++;
    return 1;
  }
  else {
    int i;

    len = enc_len(ONIG_ENCODING_EUC_JP, p);
    for (i = 0; i < len; i++) {
      *lower++ = *p++;
    }
    (*pp) += len;
    return len; /* return byte length of converted char to lower */
  }
}

static UChar*
left_adjust_char_head(const UChar* start, const UChar* s)
{
  /* In this encoding
     mb-trail bytes doesn't mix with single bytes.
  */
  const UChar *p;
  int len;

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

  while (!eucjp_islead(*p) && p > start) p--;
  len = enc_len(ONIG_ENCODING_EUC_JP, p);
  if (p + len > s) return (UChar* )p;
  p += len;
  return (UChar* )(p + ((s - p) & ~1));
}

static int
is_allowed_reverse_match(const UChar* s, const UChar* end)
{
  const UChar c = *s;
  if (c <= 0x7e || c == 0x8e || c == 0x8f)
    return TRUE;
  else
    return FALSE;
}


static int PropertyInited = 0;
static const OnigCodePoint** PropertyList;
static int PropertyListNum;
static int PropertyListSize;
static hash_table_type* PropertyNameTable;

static const OnigCodePoint CR_Hiragana[] = {
  1,
  0xa4a1, 0xa4f3
}; /* CR_Hiragana */

static const OnigCodePoint CR_Katakana[] = {
  3,
  0xa5a1, 0xa5f6,
  0xaaa6, 0xaaaf,
  0xaab1, 0xaadd
}; /* CR_Katakana */

static int
init_property_list(void)
{
  int r;

  PROPERTY_LIST_ADD_PROP("Hiragana", CR_Hiragana);
  PROPERTY_LIST_ADD_PROP("Katakana", CR_Katakana);
  PropertyInited = 1;

 end:
  return r;
}

static int
property_name_to_ctype(OnigEncoding enc, UChar* p, UChar* end)
{
  int ctype;

  PROPERTY_LIST_INIT_CHECK;

  if (onig_st_lookup_strend(PropertyNameTable, p, end, (void*)&ctype) == 0) {
    return onigenc_minimum_property_name_to_ctype(enc, p, end);
  }

  return ctype;
}

static int
is_code_ctype(OnigCodePoint code, unsigned int ctype)
{
  if (ctype <= ONIGENC_MAX_STD_CTYPE) {
    if (code < 128)
      return ONIGENC_IS_ASCII_CODE_CTYPE(code, ctype);
    else {
      if (CTYPE_IS_WORD_GRAPH_PRINT(ctype)) {
	return (code_to_mbclen(code) > 1 ? TRUE : FALSE);
      }
    }
  }
  else {
    PROPERTY_LIST_INIT_CHECK;

    ctype -= (ONIGENC_MAX_STD_CTYPE + 1);
    if (ctype >= (unsigned int )PropertyListNum)
      return ONIGENC_ERR_TYPE_BUG;

    return onig_is_in_code_range((UChar* )PropertyList[ctype], code);
  }

  return FALSE;
}

static int
get_ctype_code_range(int ctype, OnigCodePoint* sb_out,
		     const OnigCodePoint* ranges[])
{
  if (ctype <= ONIGENC_MAX_STD_CTYPE) {
    return ONIG_NO_SUPPORT_CONFIG;
  }
  else {
    *sb_out = 0x80;

    PROPERTY_LIST_INIT_CHECK;

    ctype -= (ONIGENC_MAX_STD_CTYPE + 1);
    if (ctype >= PropertyListNum)
      return ONIGENC_ERR_TYPE_BUG;

    *ranges = PropertyList[ctype];
    return 0;
  }
}


OnigEncodingType OnigEncodingEUC_JP = {
  mbc_enc_len,
  "EUC-JP",   /* name */
  3,          /* max enc length */
  1,          /* min enc length */
  onigenc_is_mbc_newline_0x0a,
  mbc_to_code,
  code_to_mbclen,
  code_to_mbc,
  mbc_case_fold,
  onigenc_ascii_apply_all_case_fold,
  onigenc_ascii_get_case_fold_codes_by_str,
  property_name_to_ctype,
  is_code_ctype,
  get_ctype_code_range,
  left_adjust_char_head,
  is_allowed_reverse_match
};