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      1 /*	$NetBSD: lex.h,v 1.7 2005/09/11 22:16:00 christos Exp $	*/
      2 
      3 /*
      4  * Source input, lexer and parser
      5  */
      6 
      7 /* $Id: lex.h,v 1.7 2005/09/11 22:16:00 christos Exp $ */
      8 
      9 #define	IDENT	64
     10 
     11 typedef struct source Source;
     12 struct source {
     13 	const char *str;	/* input pointer */
     14 	int	type;		/* input type */
     15 	const char *start;	/* start of current buffer */
     16 	union {
     17 		char **strv;	/* string [] */
     18 		struct shf *shf; /* shell file */
     19 		struct tbl *tblp; /* alias (SALIAS) */
     20 		char *freeme;	/* also for SREREAD */
     21 	} u;
     22 	char	ugbuf[2];	/* buffer for ungetsc() (SREREAD) and
     23 				 * alias (SALIAS) */
     24 	int	line;		/* line number */
     25 	int	errline;	/* line the error occurred on (0 if not set) */
     26 	const char *file;	/* input file name */
     27 	int	flags;		/* SF_* */
     28 	Area	*areap;
     29 	XString	xs;		/* input buffer */
     30 	Source *next;		/* stacked source */
     31 };
     32 
     33 /* Source.type values */
     34 #define	SEOF		0	/* input EOF */
     35 #define	SFILE		1	/* file input */
     36 #define SSTDIN		2	/* read stdin */
     37 #define	SSTRING		3	/* string */
     38 #define	SWSTR		4	/* string without \n */
     39 #define	SWORDS		5	/* string[] */
     40 #define	SWORDSEP	6	/* string[] separator */
     41 #define	SALIAS		7	/* alias expansion */
     42 #define SREREAD		8	/* read ahead to be re-scanned */
     43 
     44 /* Source.flags values */
     45 #define SF_ECHO		BIT(0)	/* echo input to shlout */
     46 #define SF_ALIAS	BIT(1)	/* faking space at end of alias */
     47 #define SF_ALIASEND	BIT(2)	/* faking space at end of alias */
     48 #define SF_TTY		BIT(3)	/* type == SSTDIN & it is a tty */
     49 
     50 /*
     51  * states while lexing word
     52  */
     53 #define	SBASE	0		/* outside any lexical constructs */
     54 #define	SWORD	1		/* implicit quoting for substitute() */
     55 #ifdef KSH
     56 #define	SLETPAREN 2		/* inside (( )), implicit quoting */
     57 #endif /* KSH */
     58 #define	SSQUOTE	3		/* inside '' */
     59 #define	SDQUOTE	4		/* inside "" */
     60 #define	SBRACE	5		/* inside ${} */
     61 #define	SCSPAREN 6		/* inside $() */
     62 #define	SBQUOTE	7		/* inside `` */
     63 #define	SASPAREN 8		/* inside $(( )) */
     64 #define SHEREDELIM 9		/* parsing <<,<<- delimiter */
     65 #define SHEREDQUOTE 10		/* parsing " in <<,<<- delimiter */
     66 #define SPATTERN 11		/* parsing *(...|...) pattern (*+?@!) */
     67 #define STBRACE 12		/* parsing ${..[#%]..} */
     68 
     69 typedef union {
     70 	int	i;
     71 	char   *cp;
     72 	char  **wp;
     73 	struct op *o;
     74 	struct ioword *iop;
     75 } YYSTYPE;
     76 
     77 /* If something is added here, add it to tokentab[] in syn.c as well */
     78 #define	LWORD	256
     79 #define	LOGAND	257		/* && */
     80 #define	LOGOR	258		/* || */
     81 #define	BREAK	259		/* ;; */
     82 #define	IF	260
     83 #define	THEN	261
     84 #define	ELSE	262
     85 #define	ELIF	263
     86 #define	FI	264
     87 #define	CASE	265
     88 #define	ESAC	266
     89 #define	FOR	267
     90 #define SELECT	268
     91 #define	WHILE	269
     92 #define	UNTIL	270
     93 #define	DO	271
     94 #define	DONE	272
     95 #define	IN	273
     96 #define	FUNCTION 274
     97 #define	TIME	275
     98 #define	REDIR	276
     99 #ifdef KSH
    100 #define MDPAREN	277		/* (( )) */
    101 #endif /* KSH */
    102 #define BANG	278		/* ! */
    103 #define DBRACKET 279		/* [[ .. ]] */
    104 #define COPROC	280		/* |& */
    105 #define	YYERRCODE 300
    106 
    107 /* flags to yylex */
    108 #define	CONTIN	BIT(0)		/* skip new lines to complete command */
    109 #define	ONEWORD	BIT(1)		/* single word for substitute() */
    110 #define	ALIAS	BIT(2)		/* recognize alias */
    111 #define	KEYWORD	BIT(3)		/* recognize keywords */
    112 #define LETEXPR	BIT(4)		/* get expression inside (( )) */
    113 #define VARASN	BIT(5)		/* check for var=word */
    114 #define ARRAYVAR BIT(6)		/* parse x[1 & 2] as one word */
    115 #define ESACONLY BIT(7)		/* only accept esac keyword */
    116 #define CMDWORD BIT(8)		/* parsing simple command (alias related) */
    117 #define HEREDELIM BIT(9)	/* parsing <<,<<- delimiter */
    118 #define HEREDOC BIT(10)		/* parsing heredoc */
    119 
    120 #define	HERES	10		/* max << in line */
    121 
    122 EXTERN	Source *source;		/* yyparse/yylex source */
    123 EXTERN	YYSTYPE	yylval;		/* result from yylex */
    124 EXTERN	struct ioword *heres [HERES], **herep;
    125 EXTERN	char	ident [IDENT+1];
    126 
    127 #ifdef HISTORY
    128 # define HISTORYSIZE	128	/* size of saved history */
    129 
    130 EXTERN	char  **histlist;	/* saved commands */
    131 EXTERN	char  **histptr;	/* last history item */
    132 EXTERN	int	histsize;	/* history size */
    133 #endif /* HISTORY */
    134