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#ifndef REGEX_H
#define REGEX_H
#include <stdint.h>
#include "arena.h"
#include "dynarr.h"
#include "str.h"
typedef enum : u8 {
RE_CHAR,
RE_CHAR_NOT,
RE_CHAR_ANY,
RE_CHAR_SET,
RE_CHAR_RANGE,
RE_CHAR_RANGE_NOT,
RE_CHAR_SET_PACKED,
RE_CHAR_SET_PACKED_NOT,
RE_LINE_START,
RE_LINE_END,
RE_MATCH,
RE_FAIL,
RE_JUMP,
RE_SPLIT,
RE_GROUP_START,
RE_GROUP_END,
RE_LABEL /* only used during codegen */
} ReOpType;
typedef union {
struct {
ReOpType op;
union {
uint32_t c;
struct {
u16 a, b;
};
};
};
u64 align;
} ReOp;
typedef struct {
uint32_t min, max;
} ReChRange;
typedef struct {
/* sorted list of non-overlapping character ranges */
ReChRange *v;
uint32_t n;
int invert;
} ReChSet;
/* for RE_CHAR */
typedef enum {
C_ANY = 0x80000000,
C_LINE_START,
C_LINE_END,
C_EOF = 0xffffffff
} ReChSpecial;
typedef struct {
DYNARR(ReOp) op;
DYNARR(ReChSet) cset;
uint32_t groups;
u8 first_byte; /* 0 if unknown */
} RegEx;
typedef struct {
uint32_t start, len;
} ReSpan;
typedef struct {
ReSpan extent;
ReSpan *grp;
} ReMatch;
typedef DYNARR(ReMatch) ReMatchList;
typedef struct {
u32 i;
ReSpan *grp;
} ReThread;
typedef struct {
ReThread *v;
uintmax_t *set;
size_t n;
} ReThreadList;
typedef enum {
RE_SEARCH_FIRST_CHUNK = 1,
RE_SEARCH_LAST_CHUNK = 2,
RE_SEARCH_MID_MATCH = 4,
} ReSearchFlags;
typedef struct {
Arena *a;
RegEx *re;
ReSpan *grp;
const char *buf;
size_t buf_len, buf_idx;
size_t total_idx;
size_t match_start, match_end;
ReThreadList tcur, tnext;
ReSearchFlags flags;
uint32_t c, c_prev;
} ReSearch;
typedef enum {
RE_COMP_NO_GROUPS = 1
} ReCompFlags;
int re_comp(RegEx *re, Str src, Arena *perm, Arena *scratch);
int re_comp_ex(RegEx *re, Str src, Arena *perm, Arena *scratch, ReCompFlags flags);
void re_search_start(ReSearch *s, RegEx *re, Arena *a);
void re_search_chunk(ReSearch *s, const char *buf, size_t n);
void re_search_last_chunk(ReSearch *s);
int re_search_match(ReSearch *s, ReMatch *m);
int re_search_match_at_start(ReSearch *s, ReMatch *m);
ReMatchList re_match_all(RegEx *re, Str s, Arena *a);
int re_match_full(RegEx *re, Str s, Arena *a);
int re_match(RegEx *re, Str s, ReMatch *out, Arena *a);
#endif
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