#include <assert.h>
#include <ctype.h>
#include <stdio.h>

#include <unistd.h>
#include <string.h>

#if __STDC__
#define ANSI
#endif

#ifdef ANSI
#include <stdlib.h>
#endif


#ifdef macintosh
#include <CursorCtl.h>
#endif

#if defined(THINK_C) || defined(__MWERKS__)
#include "m.h"
#include "s.h"
#include <stdlib.h>
#include <string.h>
#undef macintosh
#define NO_UNIX
#define outline outline_
#define ANSI
#else
#ifdef macintosh
#include ":::config:m.h"
#include ":::config:s.h"
#else
#if defined(msdos)
#include "../config.dos/m.h"
#include "../config.dos/s.h"
#elif defined(WIN32)
#include "../config.w32/m.h"
#include "../config.w32/s.h"
#else
#include "../config/m.h"
#include "../config/s.h"
#endif
#endif
#endif

#ifdef MSDOS
#define NO_UNIX
#endif
#ifdef macintosh
#define NO_UNIX
#endif

/*  machine-dependent definitions			*/
/*  the following definitions are for the Tahoe		*/
/*  they might have to be changed for other machines	*/

/*  MAXCHAR is the largest unsigned character value	*/
/*  MAXSHORT is the largest value of a C short		*/
/*  MINSHORT is the most negative value of a C short	*/
/*  MAXTABLE is the maximum table size			*/
/*  BITS_PER_WORD is the number of bits in a C unsigned	*/
/*  WORDSIZE computes the number of words needed to	*/
/*	store n bits					*/
/*  BIT returns the value of the n-th bit starting	*/
/*	from r (0-indexed)				*/
/*  SETBIT sets the n-th bit starting from r		*/

#define	MAXCHAR		255
#define	MAXSHORT	32767
#define MINSHORT	-32768
#define MAXTABLE	32500

#ifdef SIXTEEN
#define BITS_PER_WORD	16
#define	WORDSIZE(n)	(((n)+(BITS_PER_WORD-1))/BITS_PER_WORD)
#define	BIT(r, n)	((((r)[(n)>>4])>>((n)&15))&1)
#define	SETBIT(r, n)	((r)[(n)>>4]|=((unsigned)1<<((n)&15)))
#else
#define BITS_PER_WORD	32
#define	WORDSIZE(n)	(((n)+(BITS_PER_WORD-1))/BITS_PER_WORD)
#define	BIT(r, n)	((((r)[(n)>>5])>>((n)&31))&1)
#define	SETBIT(r, n)	((r)[(n)>>5]|=((unsigned)1<<((n)&31)))
#endif

/*  character names  */

#define	NUL		'\0'    /*  the null character  */
#define	NEWLINE		'\n'    /*  line feed  */
#define	SP		' '     /*  space  */
#define	BS		'\b'    /*  backspace  */
#define	HT		'\t'    /*  horizontal tab  */
#define	VT		'\013'  /*  vertical tab  */
#define	CR		'\r'    /*  carriage return  */
#define	FF		'\f'    /*  form feed  */
#define	QUOTE		'\''    /*  single quote  */
#define	DOUBLE_QUOTE	'\"'    /*  double quote  */
#define	BACKSLASH	'\\'    /*  backslash  */


/* defines for constructing filenames */

#ifndef MSDOS
#define CODE_SUFFIX	".code.c"
#define	DEFINES_SUFFIX	".tab.h"
#define OUTPUT_SUFFIX   ".sml"
#define	VERBOSE_SUFFIX	".output"
#define INTERFACE_SUFFIX ".sig"
#else
#define CODE_SUFFIX	".cod"
#define	DEFINES_SUFFIX	".h"
#define OUTPUT_SUFFIX   ".sml"
#define	VERBOSE_SUFFIX	".out"
#define INTERFACE_SUFFIX ".sig"
#endif

/* keyword codes */

#define TOKEN 0
#define LEFT 1
#define RIGHT 2
#define NONASSOC 3
#define MARK 4
#define TEXT 5
#define TYPE 6
#define START 7
#define UNION 8
#define IDENT 9

/*  symbol classes  */

#define UNKNOWN 0
#define TERM 1
#define NONTERM 2


/*  the undefined value  */

#define UNDEFINED (-1)


/*  action codes  */

#define SHIFT 1
#define REDUCE 2


/*  character macros  */

#define IS_IDENT(c)	(isalnum(c) || (c) == '_' || (c) == '.' || (c) == '$')
#define	IS_OCTAL(c)	((c) >= '0' && (c) <= '7')
#define	NUMERIC_VALUE(c)	((c) - '0')


/*  symbol macros  */

#define ISTOKEN(s)	((s) < start_symbol)
#define ISVAR(s)	((s) >= start_symbol)


/*  storage allocation macros  */

#define CALLOC(k,n)	(calloc((unsigned)(k),(unsigned)(n)))
#ifdef macintosh
#define FREE(x)         (SpinCursor ((short) 1), free((char*)(x)))
#else
#define	FREE(x)		(free((char*)(x)))
#endif
#define MALLOC(n)	(malloc((unsigned)(n)))
#define	NEW(t)		((t*)allocate(sizeof(t)))
#define	NEW2(n,t)	((t*)allocate((unsigned)((n)*sizeof(t))))
#define REALLOC(p,n)	(realloc((char*)(p),(unsigned)(n)))


/*  the structure of a symbol table entry  */

typedef struct bucket bucket;
struct bucket
{
    struct bucket *link;
    struct bucket *next;
    char *name;
    char *tag;
    short value;
    short index;
    short prec;
    char class;
    char assoc;
    char entry;
    char true_token;
};

/* TABLE_SIZE is the number of entries in the symbol table. */
/* TABLE_SIZE must be a power of two.			    */

#define	TABLE_SIZE 1024

/*  the structure of the LR(0) state machine  */

typedef struct core core;
struct core
{
    struct core *next;
    struct core *link;
    short number;
    short accessing_symbol;
    short nitems;
    short items[1];
};


/*  the structure used to record shifts  */

typedef struct shifts shifts;
struct shifts
{
    struct shifts *next;
    short number;
    short nshifts;
    short shift[1];
};


/*  the structure used to store reductions  */

typedef struct reductions reductions;
struct reductions
{
    struct reductions *next;
    short number;
    short nreds;
    short rules[1];
};


/*  the structure used to represent parser actions  */

typedef struct action action;
struct action
{
    struct action *next;
    short symbol;
    short number;
    short prec;
    char action_code;
    char assoc;
    char suppressed;
};


/* global variables */

extern char dflag;
extern char lflag;
extern char rflag;
extern char tflag;
extern char vflag;
extern char big_endian;

extern char *myname;
extern char *cptr;
extern char *line;
extern int lineno;
extern int outline;

extern char *action_file_name;
extern char *entry_file_name;
extern char *code_file_name;
extern char *defines_file_name;
extern char *input_file_name;
extern char *output_file_name;
extern char *text_file_name;
extern char *union_file_name;
extern char *verbose_file_name;
extern char *interface_file_name;

extern FILE *action_file;
extern FILE *entry_file;
extern FILE *code_file;
extern FILE *defines_file;
extern FILE *input_file;
extern FILE *output_file;
extern FILE *text_file;
extern FILE *union_file;
extern FILE *verbose_file;
extern FILE *interface_file;

extern int nitems;
extern int nrules;
extern int ntotalrules;
extern int nsyms;
extern int ntokens;
extern int nvars;
extern int ntags;

extern char unionized;
extern char line_format[];

extern int   start_symbol;
extern char  **symbol_name;
extern short *symbol_value;
extern short *symbol_prec;
extern char  *symbol_assoc;
extern char  **symbol_tag;
extern char  *symbol_true_token;

extern short *ritem;
extern short *rlhs;
extern short *rrhs;
extern short *rprec;
extern char  *rassoc;

extern short **derives;
extern char *nullable;

extern bucket *first_symbol;
extern bucket *last_symbol;

extern int nstates;
extern core *first_state;
extern shifts *first_shift;
extern reductions *first_reduction;
extern short *accessing_symbol;
extern core **state_table;
extern shifts **shift_table;
extern reductions **reduction_table;
extern unsigned *LA;
extern short *LAruleno;
extern short *lookaheads;
extern short *goto_map;
extern short *from_state;
extern short *to_state;

extern action **parser;
extern int SRtotal;
extern int RRtotal;
extern short *SRconflicts;
extern short *RRconflicts;
extern short *defred;
extern short *rules_used;
extern short nunused;
extern short final_state;

/* global functions */

/* closure.c */

extern void set_first_derives(void);
extern void closure(short *nucleus, int n);
extern void finalize_closure(void);

/* error.c */

extern void fatal(char *msg);
extern void no_space(void);
extern void open_error(char *filename);
extern void unterminated_comment(int c_lineno, char *c_line, char *c_cptr);
extern void syntax_error(int st_lineno, char *st_line, char *st_cptr);
extern void unexpected_EOF(void);
extern void unterminated_text(int t_lineno, char *t_line, char *t_cptrt_cptr);
extern void unterminated_string(int s_lineno, char *s_line, char *s_cptr);
extern void over_unionized(char *u_cptr);
extern void unterminated_union(int u_lineno, char *u_line, char *u_cptr);
extern void illegal_character(char *c_cptr);
extern void used_reserved(char *s);
extern void tokenized_start(char *s);
extern void retyped_warning(char *s);
extern void reprec_warning(char *s);
extern void revalued_warning(char *s);
extern void terminal_start(char *s);
extern void too_many_entries(void);
extern void no_grammar(void);
extern void terminal_lhs(int s_lineno);
extern void default_action_warning(void);
extern void unknown_rhs(int i);
extern void illegal_token_ref(int i, char *name);
extern void missing_type(char *s);
extern void unterminated_action(int a_lineno, char *a_line, char *a_cptr);
extern void prec_redeclared(void);
extern void undefined_goal(char *s);
extern void undefined_symbol_warning(char *s);


/* lr0.c */

extern void save_reductions(void);
extern void new_itemsets(void);
extern void save_shifts(void);
extern void lr0(void);
extern void lalr(void);

/* main.c */

extern char * allocate(unsigned n);
extern void done(int k);

/* mkpar.c */

extern void make_parser(void);
extern void free_parser(void);

/* output.c */

extern int matching_vector(int vector);
extern void output(void);
extern int default_goto(int symbol);
extern int pack_vector(int vector);

/* reader.c */

extern void reader(void);

/* skeleton.c */

void write_section(char *section[]);

/* symtab.c */

extern bucket *lookup(char *name);
extern bucket *make_bucket(char *name);
extern void create_symbol_table(void);
extern void free_symbol_table(void);
extern void free_symbols(void);

/* verbose.c */

extern void verbose(void);

/* warshall.c */

extern void reflexive_transitive_closure(unsigned *R, int n);



/* system variables */

extern int errno;


/* system functions */

#ifndef ANSI

extern void free();
extern char *calloc();
extern char *malloc();
extern char *realloc();
extern char *strcpy();

#endif
