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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) 2013-2016, 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" /* 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_ */