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/*
 * Source input, lexer and parser
 */

/* $Id: 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     errline;        /* line the error occured 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[] seperator */
#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 */

/*
 * states while lexing word
 */
#define SBASE   0                /* outside any lexical constructs */
#define SWORD   1               /* implicit quoting for substitute() */
#ifdef KSH
#define SLETPAREN 2             /* inside (( )), implicit quoting */
#endif /* KSH */
#define SSQUOTE 3               /* inside '' */
#define SDQUOTE 4               /* inside "" */
#define SBRACE  5               /* inside ${} */
#define SCSPAREN 6              /* inside $() */
#define SBQUOTE 7               /* inside `` */
#define SASPAREN 8              /* inside $(( )) */
#define SHEREDELIM 9            /* parsing <<,<<- delimiter */
#define SHEREDQUOTE 10          /* parsing " in <<,<<- delimiter */
#define SPATTERN 11             /* parsing *(...|...) pattern (*+?@!) */
#define STBRACE 12              /* parsing ${..[#%]..} */

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
#ifdef KSH
#define MDPAREN 277             /* (( )) */
#endif /* KSH */
#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 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];

#ifdef HISTORY
# define HISTORYSIZE    128     /* size of saved history */

EXTERN  char  **history;        /* saved commands */
EXTERN  char  **histptr;        /* last history item */
EXTERN  int     histsize;       /* history size */
#endif /* HISTORY */