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/* Various types of operations.  Keeping things grouped nicely
 * (unary,binary) makes switch() statements more efficeint.
 */
enum Test_op {
        TO_NONOP = 0,   /* non-operator */
        /* unary operators */
        TO_STNZE, TO_STZER, TO_OPTION,
        TO_FILAXST,
        TO_FILEXST,
        TO_FILREG, TO_FILBDEV, TO_FILCDEV, TO_FILSYM, TO_FILFIFO, TO_FILSOCK,
        TO_FILCDF, TO_FILID, TO_FILGID, TO_FILSETG, TO_FILSTCK, TO_FILUID,
        TO_FILRD, TO_FILGZ, TO_FILTT, TO_FILSETU, TO_FILWR, TO_FILEX,
        /* binary operators */
        TO_STEQL, TO_STNEQ, TO_STLT, TO_STGT, TO_INTEQ, TO_INTNE, TO_INTGT,
        TO_INTGE, TO_INTLT, TO_INTLE, TO_FILEQ, TO_FILNT, TO_FILOT
};
typedef enum Test_op Test_op;

/* Used by Test_env.isa() (order important - used to index *_tokens[] arrays) */
enum Test_meta {
        TM_OR,          /* -o or || */
        TM_AND,         /* -a or && */
        TM_NOT,         /* ! */
        TM_OPAREN,      /* ( */
        TM_CPAREN,      /* ) */
        TM_UNOP,        /* unary operator */
        TM_BINOP,       /* binary operator */
        TM_END          /* end of input */
};
typedef enum Test_meta Test_meta;

#define TEF_ERROR       BIT(0)          /* set if we've hit an error */
#define TEF_DBRACKET    BIT(1)          /* set if [[ .. ]] test */

typedef struct test_env Test_env;
struct test_env {
        int     flags;          /* TEF_* */
        union {
                char    **wp;           /* used by ptest_* */
                XPtrV   *av;            /* used by dbtestp_* */
        } pos;
        char **wp_end;                  /* used by ptest_* */
        int     (*isa) ARGS((Test_env *te, Test_meta meta));
        const char *(*getopnd) ARGS((Test_env *te, Test_op op, int do_eval));
        int     (*eval) ARGS((Test_env *te, Test_op op, const char *opnd1,
                                 const char *opnd2, int do_eval));
        void    (*error) ARGS((Test_env *te, int offset, const char *msg));
};

Test_op test_isop ARGS((Test_env *te, Test_meta meta, const char *s));
int     test_eval ARGS((Test_env *te, Test_op op, const char *opnd1,
                        const char *opnd2, int do_eval));
int     test_parse ARGS((Test_env *te));