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gb18030.c
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Tue Feb 21 23:47:57 2012 UTC (12 years, 8 months ago) by
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/**********************************************************************
gb18030.c - Oniguruma (regular expression library)
**********************************************************************/
/*-
* Copyright (c) 2005 KUBO Takehiro <kubo AT jiubao DOT org>
* 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"
#if 1
#define DEBUG_GB18030(arg)
#else
#define DEBUG_GB18030(arg) printf arg
#endif
enum {
C1, /* one-byte char */
C2, /* one-byte or second of two-byte char */
C4, /* one-byte or second or fourth of four-byte char */
CM /* first of two- or four-byte char or second of two-byte char */
};
static const char GB18030_MAP[] = {
C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1,
C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1,
C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1, C1,
C4, C4, C4, C4, C4, C4, C4, C4, C4, C4, C1, C1, C1, C1, C1, C1,
C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2,
C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2,
C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2,
C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C2, C1,
C2, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM,
CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM,
CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM,
CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM,
CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM,
CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM,
CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM,
CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, CM, C1
};
static int
gb18030_mbc_enc_len(const UChar* p)
{
if (GB18030_MAP[*p] != CM)
return 1;
p++;
if (GB18030_MAP[*p] == C4)
return 4;
if (GB18030_MAP[*p] == C1)
return 1; /* illegal sequence */
return 2;
}
static OnigCodePoint
gb18030_mbc_to_code(const UChar* p, const UChar* end)
{
return onigenc_mbn_mbc_to_code(ONIG_ENCODING_GB18030, p, end);
}
static int
gb18030_code_to_mbc(OnigCodePoint code, UChar *buf)
{
return onigenc_mb4_code_to_mbc(ONIG_ENCODING_GB18030, code, buf);
}
static int
gb18030_mbc_to_normalize(OnigAmbigType flag, const UChar** pp, const UChar* end,
UChar* lower)
{
return onigenc_mbn_mbc_to_normalize(ONIG_ENCODING_GB18030, flag,
pp, end, lower);
}
static int
gb18030_is_mbc_ambiguous(OnigAmbigType flag, const UChar** pp, const UChar* end)
{
return onigenc_mbn_is_mbc_ambiguous(ONIG_ENCODING_GB18030, flag, pp, end);
}
static int
gb18030_is_code_ctype(OnigCodePoint code, unsigned int ctype)
{
return onigenc_mb4_is_code_ctype(ONIG_ENCODING_GB18030, code, ctype);
}
enum state {
S_START,
S_one_C2,
S_one_C4,
S_one_CM,
S_odd_CM_one_CX,
S_even_CM_one_CX,
/* CMC4 : pair of "CM C4" */
S_one_CMC4,
S_odd_CMC4,
S_one_C4_odd_CMC4,
S_even_CMC4,
S_one_C4_even_CMC4,
S_odd_CM_odd_CMC4,
S_even_CM_odd_CMC4,
S_odd_CM_even_CMC4,
S_even_CM_even_CMC4,
/* C4CM : pair of "C4 CM" */
S_odd_C4CM,
S_one_CM_odd_C4CM,
S_even_C4CM,
S_one_CM_even_C4CM,
S_even_CM_odd_C4CM,
S_odd_CM_odd_C4CM,
S_even_CM_even_C4CM,
S_odd_CM_even_C4CM,
};
static UChar*
gb18030_left_adjust_char_head(const UChar* start, const UChar* s)
{
const UChar *p;
enum state state = S_START;
DEBUG_GB18030(("----------------\n"));
for (p = s; p >= start; p--) {
DEBUG_GB18030(("state %d --(%02x)-->\n", state, *p));
switch (state) {
case S_START:
switch (GB18030_MAP[*p]) {
case C1:
return (UChar *)s;
case C2:
state = S_one_C2; /* C2 */
break;
case C4:
state = S_one_C4; /* C4 */
break;
case CM:
state = S_one_CM; /* CM */
break;
}
break;
case S_one_C2: /* C2 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)s;
case CM:
state = S_odd_CM_one_CX; /* CM C2 */
break;
}
break;
case S_one_C4: /* C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)s;
case CM:
state = S_one_CMC4;
break;
}
break;
case S_one_CM: /* CM */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
return (UChar *)s;
case C4:
state = S_odd_C4CM;
break;
case CM:
state = S_odd_CM_one_CX; /* CM CM */
break;
}
break;
case S_odd_CM_one_CX: /* CM C2 */ /* CM CM */ /* CM CM CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 1);
case CM:
state = S_even_CM_one_CX;
break;
}
break;
case S_even_CM_one_CX: /* CM CM C2 */ /* CM CM CM */ /* CM CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)s;
case CM:
state = S_odd_CM_one_CX;
break;
}
break;
case S_one_CMC4: /* CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
return (UChar *)(s - 1);
case C4:
state = S_one_C4_odd_CMC4; /* C4 CM C4 */
break;
case CM:
state = S_even_CM_one_CX; /* CM CM C4 */
break;
}
break;
case S_odd_CMC4: /* CM C4 CM C4 CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
return (UChar *)(s - 1);
case C4:
state = S_one_C4_odd_CMC4;
break;
case CM:
state = S_odd_CM_odd_CMC4;
break;
}
break;
case S_one_C4_odd_CMC4: /* C4 CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 1);
case CM:
state = S_even_CMC4; /* CM C4 CM C4 */
break;
}
break;
case S_even_CMC4: /* CM C4 CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
return (UChar *)(s - 3);
case C4:
state = S_one_C4_even_CMC4;
break;
case CM:
state = S_odd_CM_even_CMC4;
break;
}
break;
case S_one_C4_even_CMC4: /* C4 CM C4 CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 3);
case CM:
state = S_odd_CMC4;
break;
}
break;
case S_odd_CM_odd_CMC4: /* CM CM C4 CM C4 CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 3);
case CM:
state = S_even_CM_odd_CMC4;
break;
}
break;
case S_even_CM_odd_CMC4: /* CM CM CM C4 CM C4 CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 1);
case CM:
state = S_odd_CM_odd_CMC4;
break;
}
break;
case S_odd_CM_even_CMC4: /* CM CM C4 CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 1);
case CM:
state = S_even_CM_even_CMC4;
break;
}
break;
case S_even_CM_even_CMC4: /* CM CM CM C4 CM C4 */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 3);
case CM:
state = S_odd_CM_even_CMC4;
break;
}
break;
case S_odd_C4CM: /* C4 CM */ /* C4 CM C4 CM C4 CM*/
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)s;
case CM:
state = S_one_CM_odd_C4CM; /* CM C4 CM */
break;
}
break;
case S_one_CM_odd_C4CM: /* CM C4 CM */ /* CM C4 CM C4 CM C4 CM */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
return (UChar *)(s - 2); /* |CM C4 CM */
case C4:
state = S_even_C4CM;
break;
case CM:
state = S_even_CM_odd_C4CM;
break;
}
break;
case S_even_C4CM: /* C4 CM C4 CM */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 2); /* C4|CM C4 CM */
case CM:
state = S_one_CM_even_C4CM;
break;
}
break;
case S_one_CM_even_C4CM: /* CM C4 CM C4 CM */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
return (UChar *)(s - 0); /*|CM C4 CM C4|CM */
case C4:
state = S_odd_C4CM;
break;
case CM:
state = S_even_CM_even_C4CM;
break;
}
break;
case S_even_CM_odd_C4CM: /* CM CM C4 CM */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 0); /* |CM CM|C4|CM */
case CM:
state = S_odd_CM_odd_C4CM;
break;
}
break;
case S_odd_CM_odd_C4CM: /* CM CM CM C4 CM */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 2); /* |CM CM|CM C4 CM */
case CM:
state = S_even_CM_odd_C4CM;
break;
}
break;
case S_even_CM_even_C4CM: /* CM CM C4 CM C4 CM */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 2); /* |CM CM|C4|CM C4 CM */
case CM:
state = S_odd_CM_even_C4CM;
break;
}
break;
case S_odd_CM_even_C4CM: /* CM CM CM C4 CM C4 CM */
switch (GB18030_MAP[*p]) {
case C1:
case C2:
case C4:
return (UChar *)(s - 0); /* |CM CM|CM C4 CM C4|CM */
case CM:
state = S_even_CM_even_C4CM;
break;
}
break;
}
}
DEBUG_GB18030(("state %d\n", state));
switch (state) {
case S_START: return (UChar *)(s - 0);
case S_one_C2: return (UChar *)(s - 0);
case S_one_C4: return (UChar *)(s - 0);
case S_one_CM: return (UChar *)(s - 0);
case S_odd_CM_one_CX: return (UChar *)(s - 1);
case S_even_CM_one_CX: return (UChar *)(s - 0);
case S_one_CMC4: return (UChar *)(s - 1);
case S_odd_CMC4: return (UChar *)(s - 1);
case S_one_C4_odd_CMC4: return (UChar *)(s - 1);
case S_even_CMC4: return (UChar *)(s - 3);
case S_one_C4_even_CMC4: return (UChar *)(s - 3);
case S_odd_CM_odd_CMC4: return (UChar *)(s - 3);
case S_even_CM_odd_CMC4: return (UChar *)(s - 1);
case S_odd_CM_even_CMC4: return (UChar *)(s - 1);
case S_even_CM_even_CMC4: return (UChar *)(s - 3);
case S_odd_C4CM: return (UChar *)(s - 0);
case S_one_CM_odd_C4CM: return (UChar *)(s - 2);
case S_even_C4CM: return (UChar *)(s - 2);
case S_one_CM_even_C4CM: return (UChar *)(s - 0);
case S_even_CM_odd_C4CM: return (UChar *)(s - 0);
case S_odd_CM_odd_C4CM: return (UChar *)(s - 2);
case S_even_CM_even_C4CM: return (UChar *)(s - 2);
case S_odd_CM_even_C4CM: return (UChar *)(s - 0);
}
return (UChar* )s; /* never come here. (escape warning) */
}
static int
gb18030_is_allowed_reverse_match(const UChar* s, const UChar* end)
{
return GB18030_MAP[*s] == C1 ? TRUE : FALSE;
}
OnigEncodingType OnigEncodingGB18030 = {
gb18030_mbc_enc_len,
"GB18030", /* name */
4, /* max enc length */
1, /* min enc length */
ONIGENC_AMBIGUOUS_MATCH_ASCII_CASE,
{
(OnigCodePoint )'\\' /* esc */
, (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anychar '.' */
, (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anytime '*' */
, (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* zero or one time '?' */
, (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* one or more time '+' */
, (OnigCodePoint )ONIG_INEFFECTIVE_META_CHAR /* anychar anytime */
},
onigenc_is_mbc_newline_0x0a,
gb18030_mbc_to_code,
onigenc_mb4_code_to_mbclen,
gb18030_code_to_mbc,
gb18030_mbc_to_normalize,
gb18030_is_mbc_ambiguous,
onigenc_ascii_get_all_pair_ambig_codes,
onigenc_nothing_get_all_comp_ambig_codes,
gb18030_is_code_ctype,
onigenc_not_support_get_ctype_code_range,
gb18030_left_adjust_char_head,
gb18030_is_allowed_reverse_match
};
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