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/* dctrl-tools - Debian control file inspection tools
Copyright (C) 2003, 2004, 2005 Antti-Juhani Kaijanaho
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef PREDICATE_H
#define PREDICATE_H
#include <assert.h>
#include <regex.h>
#include <stdint.h>
#include "fieldtrie.h"
#include "paragraph.h"
#define MAX_OPS 4096
#define MAX_ATOMS 4096
#define I_NOP 0
#define I_NEG 1 /* --not; 1-1 */
#define I_AND 2 /* --and; 2-1 */
#define I_OR 3 /* --or; 2-1 */
#define I_PUSH(n) (4+(n)) /* push result of nth atomic proposition */
/* An atomic predicate. */
struct atom {
/* The name of field to which matching is limited. Empty
* field_name specifies the whole paragraph (in which case
* field_inx is -1. */
char const * field_name; size_t field_inx;
/* Matching mode */
enum matching_mode {
M_SUBSTR, /* substring matching */
M_REGEX, /* POSIX regular expression match */
M_EREGEX, /* POSIX extended regular expression matching */
M_EXACT, /* exact string match */
#define M_FIRST_VERSION M_VER_EQ
M_VER_EQ, /* numeric equality comparison */
M_VER_LT, /* numeric < */
M_VER_LE, /* numeric <= */
M_VER_GT, /* numeric > */
M_VER_GE, /* numeric >= */
#define M_LAST_VERSION M_VER_GE
} mode;
/* Flag: should matching ignore case */
unsigned ignore_case;
/* The pattern as given on the command line; interpretation
* depends on matching mode. Must be null-terminated and
* patlen must equal strlen(pat). */
char const * pat; size_t patlen;
/* A compiled version of pat; valid only when mode is M_REGEX
* or M_EREGEX. */
regex_t regex;
};
/* A predicate is represented as a set of atomic predicates and a
* program - a sequence of stack-based "bytecode" instructions - that
* specifies the structure of the combined predicate. */
struct predicate {
/* Number of atomic predicates. */
size_t num_atoms;
/* Length of the program */
size_t proglen;
/* The program */
int program[MAX_OPS];
/* The atomic predicates */
struct atom atoms[MAX_ATOMS];
};
void init_predicate(struct predicate * p);
static inline
struct atom * get_current_atom(struct predicate * p)
{
assert(p->num_atoms > 0);
return &p->atoms[p->num_atoms-1];
}
void predicate_finish_atom(struct predicate *);
void addinsn(struct predicate * p, int insn);
bool does_para_satisfy(struct predicate * p, para_t *);
bool check_predicate(struct predicate * p);
#endif /* PREDICATE_H */
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