
#include "api.h"

#define HEAD 2*sizeof(int)

#define SIZE(p)        ((int *)(p))[-1]
#define SET_SIZE(p, n) ((int *)(p))[-1] = n
#define CAPACITY(p)    ((int *)(p))[-2]

struct among
{
    /* Number of symbols in s. */
    int s_size;
    /* Search string. */
    const symbol * s;
    /* Delta of index to longest matching substring, or 0 if none. */
    int substring_i;
    /* Result of the lookup. */
    int result;
    /* Optional condition routine, or NULL if none. */
    int (* function)(struct SN_env *);
};

extern symbol * create_s(void);
extern void lose_s(symbol * p);

extern int skip_utf8(const symbol * p, int c, int limit, int n);

extern int skip_b_utf8(const symbol * p, int c, int limit, int n);

extern int in_grouping_U(struct SN_env * z, const unsigned char * s, int min, int max, int repeat);
extern int in_grouping_b_U(struct SN_env * z, const unsigned char * s, int min, int max, int repeat);
extern int out_grouping_U(struct SN_env * z, const unsigned char * s, int min, int max, int repeat);
extern int out_grouping_b_U(struct SN_env * z, const unsigned char * s, int min, int max, int repeat);

extern int in_grouping(struct SN_env * z, const unsigned char * s, int min, int max, int repeat);
extern int in_grouping_b(struct SN_env * z, const unsigned char * s, int min, int max, int repeat);
extern int out_grouping(struct SN_env * z, const unsigned char * s, int min, int max, int repeat);
extern int out_grouping_b(struct SN_env * z, const unsigned char * s, int min, int max, int repeat);

extern int eq_s(struct SN_env * z, int s_size, const symbol * s);
extern int eq_s_b(struct SN_env * z, int s_size, const symbol * s);
extern int eq_v(struct SN_env * z, const symbol * p);
extern int eq_v_b(struct SN_env * z, const symbol * p);

extern int find_among(struct SN_env * z, const struct among * v, int v_size);
extern int find_among_b(struct SN_env * z, const struct among * v, int v_size);

extern int replace_s(struct SN_env * z, int c_bra, int c_ket, int s_size, const symbol * s, int * adjustment);
extern int slice_from_s(struct SN_env * z, int s_size, const symbol * s);
extern int slice_from_v(struct SN_env * z, const symbol * p);
extern int slice_del(struct SN_env * z);

extern int insert_s(struct SN_env * z, int bra, int ket, int s_size, const symbol * s);
extern int insert_v(struct SN_env * z, int bra, int ket, const symbol * p);

extern symbol * slice_to(struct SN_env * z, symbol * p);
extern symbol * assign_to(struct SN_env * z, symbol * p);

extern int len_utf8(const symbol * p);

extern void debug(struct SN_env * z, int number, int line_count);
