/*
 * lex -- header file for lex.c
 *
 * Modified 02-Dec-80 Bob Denny -- Conditionalize debug code for smaller size
 *				   Turn on debug code when overlaid.
 *          03-Dec-80 Bob Denny -- Change allocations for moves, nfa's and
 *				    dfa's for RT-11. Try these for RSX if
 *				    you overlay the same way.
 *          28-May-81 Bob Denny -- Change allocations for both RT and RSX.
 *                                  Overlay is same. Debug code adds little
 *                                  task space. Delete externs which caused
 *				    TKB to barf.
 *	    28-Aug-81 Bob Denny -- Add extern int sflag for "-s" support.
 * 	    30-Oct-82 Bob Denny -- Change allocations for RSX.
 *	    15-Apr-83 Bob Denny -- Add big allocations for VAX-11 C
 *
 */

/*
 * Original allocations.
 */
#define	NCHARS	0400	/* Size of character set */
#define	NCPW	2	/* # characters per word */
#define	NBPC	8	/* # bits per character */
#define	NBPW	(NCPW*NBPC)	/* # bits per word */

#define	MAXNFA	600	/* Number of NFA states */
#define	MAXDFA	800	/* Number of DFA states */
#define	NTRANS	128	/* Number of translations */
#define	NCCLS	50	/* Number of character classes */
#define	NNEXT	2400	/* Size of dfa move vectors (later: allocate) */

/*
 * Cut down maxnfa/maxdfa for Decus C, enable debug code. Program must
 * be overlaid per the BUILD stuff in LEX.C, if so the
 * presence of the debug code makes little difference in program size!
 * Also, there are usually more NFA states than DFA ones, and 2400 is
 * a bunch of move vectors. I have updated the values to suit my
 * needs. Some day, I'll make this use dynamic allocation!!!
 */
#define DEBUG		/* Turn on debug code	*/
#ifdef rsx
#define MAXNFA	750	/* Number of NFA states */
#define	MAXDFA	250	/* Number of DFA states */
#define NNEXT	1200	/* Number of move vects	*/
#else
#define MAXNFA	400	/* Number of NFA states */
#define	MAXDFA	200	/* Number of DFA states */
#define NNEXT	1000	/* Number of move vects	*/
#endif
#ifdef vms
#define MAXNFA	750	/* Number of NFA states */
#define	MAXDFA	250	/* Number of DFA states */
#define NNEXT	1200	/* Number of move vects	*/
#endif
/*
 * For VAX-11 (native) C, take advantage of 32-bit virtual architecture.
 */
#ifdef vax11c
#define	NCPW	4	/* # characters per word */
#define	NBPC	8	/* # bits per character */
#define	NBPW	(NCPW*NBPC)	/* # bits per word */
#define MAXNFA	2000	/* Number of NFA states */
#define	MAXDFA	1500	/* Number of DFA states */
#define NNEXT	3000	/* Number of move vects	*/
#endif
/*
 */

/*
 * Special node characters.
 */
#define	CCL	NCHARS		/* One of a character class */
#define	EPSILON	NCHARS+1	/* Transition on epsilon */
#define	FIN	NCHARS+2	/* Final state; NFA */

/*
 * Set of state numbers (dfa state name).
 */
struct	set {
	struct set *s_next;
	struct	dfa	*s_state;	/* pointer into dfa array  */
	struct	set	*s_group;	/* pointer to owning group (dfamin) */
	int	s_final;		/* nf state which matches  */
	char	s_flag;			/* see below */
	int	s_look;			/* look-ahead bits */
	int	s_len;			/* number of elements in set */
	struct nfa *s_els[];
};

/*
 * State entry
 */
struct	nfa {
	int	n_char;
	char	*n_ccl;
	char	n_flag;
	char	n_look;		/* lookahead index */
	struct	nfa	*n_succ[2];
	struct	trans	*n_trans;
};

/*
 * DFA transition entry.
 */
struct	move {
	struct	set	*m_next;
	struct	dfa	*m_check;
};

/*
 * Structure of DFA vector.
 */
struct	dfa {
	struct	set	*df_name;
	struct	move	*df_base;
	struct	move	*df_max;
	struct	dfa	*df_default;
	int	df_ntrans;
};

/*
 * s_flag values for DFA node
 */
#define	LOOK	01	/* Lookahead mark */
#define	ADDED	02	/* DFA construction mark */
#define	FLOOK	04	/* Mark on final state of lookahead translation */

/*
 * Flag used to print node
 */
#define	NPRT	010	/* NFA node printed */

/*
 * Transition set.
 */
struct	xset {
	struct	set	*x_set;
	char	x_char;
	char	x_defsame;
};

/*
 * Translations
 */
struct	trans {
	struct	nfa	*t_start;
	struct	nfa	*t_final;
};

/*
 * External definitions.
 */
extern	struct	trans	trans[];
extern	struct	trans	*transp;
extern	struct	nfa	nfa[];
extern	struct	nfa	*nfap;
extern	struct	dfa	dfa[];
extern	int	ndfa;
extern	struct	move	move[];
extern	struct	xset	sets[];
extern	char	insets[];
extern	struct	set	*setlist;
extern	char	ccls[][(NCHARS+1)/NBPC];
extern	int	nccls;
extern	int	nlook;
extern	int	llnxtmax;
extern	char	*tabname;
extern	FILE	*llout;
extern	FILE	*lexin;
extern	int	aflag;
extern  int	sflag;
extern	char	*infile;

#ifdef DEBUG
extern	FILE	*lexlog;
extern	int	lldebug;
extern 	int	mflag;
#endif

/*****
extern	char	*ignore;
extern	char	*illeg;
extern	char	*breakc;

extern	struct	nfa	*newnfa();
extern	struct	set	*newset();
extern	char	*newccl();
extern	char	*lalloc();
*****/
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