1 /**********************************************************************
2 big5.c - Oniguruma (regular expression library)
3 **********************************************************************/
4 /*-
5 * Copyright (c) 2002-2005 K.Kosako <sndgk393 AT ybb DOT ne DOT jp>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include "regenc.h"
31
32 static const int EncLen_BIG5[] = {
33 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
34 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
35 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
36 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
37 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
38 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
39 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
40 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
41 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
42 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
43 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
44 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
45 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
46 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
47 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
48 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1
49 };
50
51 static int
big5_mbc_enc_len(const UChar * p)52 big5_mbc_enc_len(const UChar* p)
53 {
54 return EncLen_BIG5[*p];
55 }
56
57 static OnigCodePoint
big5_mbc_to_code(const UChar * p,const UChar * end)58 big5_mbc_to_code(const UChar* p, const UChar* end)
59 {
60 return onigenc_mbn_mbc_to_code(ONIG_ENCODING_BIG5, p, end);
61 }
62
63 static int
big5_code_to_mbc(OnigCodePoint code,UChar * buf)64 big5_code_to_mbc(OnigCodePoint code, UChar *buf)
65 {
66 return onigenc_mb2_code_to_mbc(ONIG_ENCODING_BIG5, code, buf);
67 }
68
69 static int
big5_mbc_to_normalize(OnigAmbigType flag,const UChar ** pp,const UChar * end,UChar * lower)70 big5_mbc_to_normalize(OnigAmbigType flag, const UChar** pp, const UChar* end,
71 UChar* lower)
72 {
73 return onigenc_mbn_mbc_to_normalize(ONIG_ENCODING_BIG5, flag,
74 pp, end, lower);
75 }
76
77 static int
big5_is_mbc_ambiguous(OnigAmbigType flag,const UChar ** pp,const UChar * end)78 big5_is_mbc_ambiguous(OnigAmbigType flag, const UChar** pp, const UChar* end)
79 {
80 return onigenc_mbn_is_mbc_ambiguous(ONIG_ENCODING_BIG5, flag, pp, end);
81 }
82
83 static int
big5_is_code_ctype(OnigCodePoint code,unsigned int ctype)84 big5_is_code_ctype(OnigCodePoint code, unsigned int ctype)
85 {
86 return onigenc_mb2_is_code_ctype(ONIG_ENCODING_BIG5, code, ctype);
87 }
88
89 static const char BIG5_CAN_BE_TRAIL_TABLE[256] = {
90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
91 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
92 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
93 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
94 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
95 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
96 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
97 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
98 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
99 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
100 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
101 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
102 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
103 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
104 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
105 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0
106 };
107
108 #define BIG5_ISMB_FIRST(byte) (EncLen_BIG5[byte] > 1)
109 #define BIG5_ISMB_TRAIL(byte) BIG5_CAN_BE_TRAIL_TABLE[(byte)]
110
111 static UChar*
big5_left_adjust_char_head(const UChar * start,const UChar * s)112 big5_left_adjust_char_head(const UChar* start, const UChar* s)
113 {
114 const UChar *p;
115 int len;
116
117 if (s <= start) return (UChar* )s;
118 p = s;
119
120 if (BIG5_ISMB_TRAIL(*p)) {
121 while (p > start) {
122 if (! BIG5_ISMB_FIRST(*--p)) {
123 p++;
124 break;
125 }
126 }
127 }
128 len = enc_len(ONIG_ENCODING_BIG5, p);
129 if (p + len > s) return (UChar* )p;
130 p += len;
131 return (UChar* )(p + ((s - p) & ~1));
132 }
133
134 static int
big5_is_allowed_reverse_match(const UChar * s,const UChar * end)135 big5_is_allowed_reverse_match(const UChar* s, const UChar* end)
136 {
137 const UChar c = *s;
138
139 return (BIG5_ISMB_TRAIL(c) ? FALSE : TRUE);
140 }
141
142 OnigEncodingType OnigEncodingBIG5 = {
143 big5_mbc_enc_len,
144 "Big5", /* name */
145 2, /* max enc length */
146 1, /* min enc length */
147 ONIGENC_AMBIGUOUS_MATCH_ASCII_CASE,
148 {
149 (OnigCodePoint )'\\' /* esc */
150 , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anychar '.' */
151 , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anytime '*' */
152 , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* zero or one time '?' */
153 , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* one or more time '+' */
154 , (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anychar anytime */
155 },
156 onigenc_is_mbc_newline_0x0a,
157 big5_mbc_to_code,
158 onigenc_mb2_code_to_mbclen,
159 big5_code_to_mbc,
160 big5_mbc_to_normalize,
161 big5_is_mbc_ambiguous,
162 onigenc_ascii_get_all_pair_ambig_codes,
163 onigenc_nothing_get_all_comp_ambig_codes,
164 big5_is_code_ctype,
165 onigenc_not_support_get_ctype_code_range,
166 big5_left_adjust_char_head,
167 big5_is_allowed_reverse_match
168 };
169
