ref: a7f5ecaf636e38f407c951d0e86dcc4c4f424bd6
dir: /sys/src/ape/cmd/pdksh/lex.h/
/*
* 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 */