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/* Copyright 2009
* Kaz Kylheku <kkylheku@gmail.com>
* Vancouver, Canada
* All rights reserved.
*
* BSD License:
*
* 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.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <limits.h>
typedef unsigned int bitcell_t;
#define BITCELL_ALL1 UINT_MAX
#define CHAR_SET_SIZE (256 / (sizeof (bitcell_t) * CHAR_BIT))
typedef enum {
CHSET_SMALL, CHSET_DISPLACED, CHSET_LARGE, CHSET_XLARGE
} chset_type_t;
typedef bitcell_t cset_L0_t[CHAR_SET_SIZE];
typedef cset_L0_t *cset_L1_t[16];
typedef cset_L1_t *cset_L2_t[16];
typedef cset_L2_t *cset_L3_t[17];
struct any_char_set {
chset_type_t type : 4;
int compl : 2;
};
struct small_char_set {
chset_type_t type : 4;
int compl : 2;
cset_L0_t bitcell;
};
struct displaced_char_set {
chset_type_t type : 4;
int compl : 2;
cset_L0_t bitcell;
wchar_t base;
};
struct large_char_set {
chset_type_t type : 4;
int inv : 2;
cset_L2_t dir;
};
struct xlarge_char_set {
chset_type_t type : 4;
int inv : 2;
cset_L3_t dir;
};
typedef union char_set {
struct any_char_set any;
struct small_char_set s;
struct displaced_char_set d;
struct large_char_set l;
struct xlarge_char_set xl;
} char_set_t;
char_set_t *char_set_create(chset_type_t, wchar_t);
void char_set_destroy(char_set_t *);
void char_set_compl(char_set_t *);
void char_set_add(char_set_t *, wchar_t);
void char_set_add_range(char_set_t *, wchar_t, wchar_t); /* inclusive */
int char_set_contains(char_set_t *, wchar_t);
typedef enum {
nfa_accept, nfa_empty, nfa_wild, nfa_single, nfa_set
} nfa_kind_t;
typedef union nfa_state nfa_state_t;
struct nfa_state_accept {
nfa_kind_t kind;
unsigned visited;
};
struct nfa_state_empty {
nfa_kind_t kind;
unsigned visited;
nfa_state_t *trans0;
nfa_state_t *trans1;
};
struct nfa_state_single {
nfa_kind_t kind;
unsigned visited;
nfa_state_t *trans;
wchar_t ch;
};
struct nfa_state_set {
nfa_kind_t kind;
unsigned visited;
nfa_state_t *trans;
char_set_t *set;
};
union nfa_state {
struct nfa_state_accept a;
struct nfa_state_empty e;
struct nfa_state_single o;
struct nfa_state_set s;
};
nfa_state_t *nfa_state_accept(void);
nfa_state_t *nfa_state_empty(nfa_state_t *, nfa_state_t *);
nfa_state_t *nfa_state_single(nfa_state_t *, wchar_t ch);
nfa_state_t *nfa_state_wild(nfa_state_t *);
nfa_state_t *nfa_state_set(nfa_state_t *, char_set_t *);
void nfa_state_free(nfa_state_t *st);
void nfa_state_shallow_free(nfa_state_t *st);
void nfa_state_merge(nfa_state_t *accept, nfa_state_t *);
typedef struct nfa {
nfa_state_t *start;
nfa_state_t *accept;
} nfa_t;
typedef enum nfam_result {
NFAM_INCOMPLETE, NFAM_FAIL, NFAM_MATCH
} nfam_result_t;
typedef struct nfa_machine {
long last_accept_pos;
unsigned visited;
nfa_state_t **move, **clos, **stack;
int nmove, nclos;
long count;
nfa_t nfa;
} nfa_machine_t;
nfa_t nfa_compile_regex(obj_t *regex);
void nfa_free(nfa_t);
long nfa_run(nfa_t nfa, const wchar_t *str);
void nfa_machine_reset(nfa_machine_t *);
void nfa_machine_init(nfa_machine_t *, nfa_t);
void nfa_machine_cleanup(nfa_machine_t *);
nfam_result_t nfa_machine_feed(nfa_machine_t *, wchar_t ch);
long nfa_machine_match_span(nfa_machine_t *);
obj_t *regex_compile(obj_t *regex_sexp);
obj_t *regexp(obj_t *);
nfa_t *regex_nfa(obj_t *);
obj_t *search_regex(obj_t *haystack, obj_t *needle_regex, obj_t *start_num,
obj_t *from_end);
obj_t *match_regex(obj_t *str, obj_t *regex, obj_t *pos);
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