/*      $OpenBSD: lex.h,v 1.21 2018/01/15 14:58:05 jca Exp $    */

/*
 * Source input, lexer and parser
 */

/* $From: lex.h,v 1.4 1994/05/31 13:34:34 michael Exp $ */

#define IDENT   64

typedef struct source Source;
struct source {
        const char *str;        /* input pointer */
        int     type;           /* input type */
        const char *start;      /* start of current buffer */
        union {
                char **strv;    /* string [] */
                struct shf *shf; /* shell file */
                struct tbl *tblp; /* alias (SALIAS) */
                char *freeme;   /* also for SREREAD */
        } u;
        char    ugbuf[2];       /* buffer for ungetsc() (SREREAD) and
                                 * alias (SALIAS) */
        int     line;           /* line number */
        int     cmd_offset;     /* line number - command number */
        int     errline;        /* line the error occurred on (0 if not set) */
        const char *file;       /* input file name */
        int     flags;          /* SF_* */
        Area    *areap;
        XString xs;             /* input buffer */
        Source *next;           /* stacked source */
};

/* Source.type values */
#define SEOF            0       /* input EOF */
#define SFILE           1       /* file input */
#define SSTDIN          2       /* read stdin */
#define SSTRING         3       /* string */
#define SWSTR           4       /* string without \n */
#define SWORDS          5       /* string[] */
#define SWORDSEP        6       /* string[] separator */
#define SALIAS          7       /* alias expansion */
#define SREREAD         8       /* read ahead to be re-scanned */

/* Source.flags values */
#define SF_ECHO         BIT(0)  /* echo input to shlout */
#define SF_ALIAS        BIT(1)  /* faking space at end of alias */
#define SF_ALIASEND     BIT(2)  /* faking space at end of alias */
#define SF_TTY          BIT(3)  /* type == SSTDIN & it is a tty */

typedef union {
        int     i;
        char   *cp;
        char  **wp;
        struct op *o;
        struct ioword *iop;
} YYSTYPE;

/* If something is added here, add it to tokentab[] in syn.c as well */
#define LWORD   256
#define LOGAND  257             /* && */
#define LOGOR   258             /* || */
#define BREAK   259             /* ;; */
#define IF      260
#define THEN    261
#define ELSE    262
#define ELIF    263
#define FI      264
#define CASE    265
#define ESAC    266
#define FOR     267
#define SELECT  268
#define WHILE   269
#define UNTIL   270
#define DO      271
#define DONE    272
#define IN      273
#define FUNCTION 274
#define TIME    275
#define REDIR   276
#define MDPAREN 277             /* (( )) */
#define BANG    278             /* ! */
#define DBRACKET 279            /* [[ .. ]] */
#define COPROC  280             /* |& */
#define YYERRCODE 300

/* flags to yylex */
#define CONTIN  BIT(0)          /* skip new lines to complete command */
#define ONEWORD BIT(1)          /* single word for substitute() */
#define ALIAS   BIT(2)          /* recognize alias */
#define KEYWORD BIT(3)          /* recognize keywords */
#define LETEXPR BIT(4)          /* get expression inside (( )) */
#define VARASN  BIT(5)          /* check for var=word */
#define ARRAYVAR BIT(6)         /* parse x[1 & 2] as one word */
#define ESACONLY BIT(7)         /* only accept esac keyword */
#define CMDWORD BIT(8)          /* parsing simple command (alias related) */
#define HEREDELIM BIT(9)        /* parsing <<,<<- delimiter */
#define HEREDOC BIT(10)         /* parsing heredoc */
#define UNESCAPE BIT(11)        /* remove backslashes */

#define HERES   10              /* max << in line */

extern Source  *source;         /* yyparse/yylex source */
extern YYSTYPE  yylval;         /* result from yylex */
extern struct ioword *heres[HERES], **herep;
extern char     ident[IDENT+1];

#define HISTORYSIZE     500     /* size of saved history */

extern char   **history;        /* saved commands */
extern char   **histptr;        /* last history item */
extern uint32_t histsize;       /* history size */

int     yylex(int);
void    yyerror(const char *, ...)
            __attribute__((__noreturn__, __format__ (printf, 1, 2)));
Source * pushs(int, Area *);
void    set_prompt(int);
void    pprompt(const char *, int);