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/*-------------------------------------------------------------------------
*
* regexport.h
* Declarations for exporting info about a regex's NFA (nondeterministic
* finite automaton)
*
* The functions declared here provide accessors to extract the NFA state
* graph and color character sets of a successfully-compiled regex.
*
* An NFA contains one or more states, numbered 0..N-1. There is an initial
* state, as well as a final state --- reaching the final state denotes
* successful matching of an input string. Each state except the final one
* has some out-arcs that lead to successor states, each arc being labeled
* with a color that represents one or more concrete character codes.
* (The colors of a state's out-arcs need not be distinct, since this is an
* NFA not a DFA.) There are also "pseudocolors" representing start/end of
* line and start/end of string. Colors are numbered 0..C-1, but note that
* color 0 is "white" (all unused characters) and can generally be ignored.
*
* Portions Copyright (c) 2013-2022, PostgreSQL Global Development Group
* Portions Copyright (c) 1998, 1999 Henry Spencer
*
* IDENTIFICATION
* src/include/regex/regexport.h
*
*-------------------------------------------------------------------------
*/
#ifndef _REGEXPORT_H_
#define _REGEXPORT_H_
#include "regex/regex.h"
/* These macros must match corresponding ones in regguts.h: */
#define COLOR_WHITE 0 /* color for chars not appearing in regex */
#define COLOR_RAINBOW (-2) /* represents all colors except pseudocolors */
/* information about one arc of a regex's NFA */
typedef struct
{
int co; /* label (character-set color) of arc */
int to; /* next state number */
} regex_arc_t;
/* Functions for gathering information about NFA states and arcs */
extern int pg_reg_getnumstates(const regex_t *regex);
extern int pg_reg_getinitialstate(const regex_t *regex);
extern int pg_reg_getfinalstate(const regex_t *regex);
extern int pg_reg_getnumoutarcs(const regex_t *regex, int st);
extern void pg_reg_getoutarcs(const regex_t *regex, int st,
regex_arc_t *arcs, int arcs_len);
/* Functions for gathering information about colors */
extern int pg_reg_getnumcolors(const regex_t *regex);
extern int pg_reg_colorisbegin(const regex_t *regex, int co);
extern int pg_reg_colorisend(const regex_t *regex, int co);
extern int pg_reg_getnumcharacters(const regex_t *regex, int co);
extern void pg_reg_getcharacters(const regex_t *regex, int co,
pg_wchar *chars, int chars_len);
#endif /* _REGEXPORT_H_ */
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