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//
// match.h - Header file for BP virtual machine.
//
#ifndef MATCH__H
#define MATCH__H
#include <stdbool.h>
#include <stdio.h>
#include "pattern.h"
#include "definitions.h"
struct match_s; // forward declared to resolve circular struct defs
typedef struct {
struct match_s **home, *next;
} match_dll_t;
// #define MATCH_FROM(node, name) ((match_t*)((char*)node + (size_t)(&((match_t*)0)->name)))
//
// Pattern matching result object
//
typedef struct match_s {
// Where the match starts and ends (end is after the last character)
const char *start, *end;
pat_t *pat;
// Intrusive linked list nodes for garbage collection and cache buckets:
match_dll_t gc, cache;
size_t defs_id;
int refcount;
struct match_s **children;
struct match_s *_children[3];
} match_t;
__attribute__((returns_nonnull))
match_t *new_match(def_t *defs, pat_t *pat, const char *start, const char *end, match_t *children[]);
__attribute__((nonnull))
void recycle_if_unused(match_t **at_m);
size_t free_all_matches(void);
size_t recycle_all_matches(void);
bool next_match(match_t **m, def_t *defs, const char *start, const char *end, pat_t *pat, pat_t *skip, bool ignorecase);
#define stop_matching(m) next_match(m, NULL, NULL, NULL, NULL, NULL, 0)
__attribute__((nonnull))
match_t *get_numbered_capture(match_t *m, int n);
__attribute__((nonnull, pure))
match_t *get_named_capture(match_t *m, const char *name, size_t namelen);
__attribute__((nonnull))
void fprint_match(FILE *out, const char *file_start, match_t *m);
#endif
// vim: ts=4 sw=0 et cino=L2,l1,(0,W4,m1,\:0
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