/*************************************************************************\
* Copyright (c) 2002 The University of Chicago, as Operator of Argonne
*     National Laboratory.
* Copyright (c) 2002 The Regents of the University of California, as
*     Operator of Los Alamos National Laboratory.
* EPICS BASE is distributed subject to a Software License Agreement found
* in file LICENSE that is included with this distribution. 
\*************************************************************************/
/* flexdef - definitions file for flex */

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Vern Paxson.
 * 
 * The United States Government has rights in this work pursuant
 * to contract no. DE-AC03-76SF00098 between the United States
 * Department of Energy and the University of California.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * Neither the name of the University nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#ifndef INC_flexdef_H
#define INC_flexdef_H

#include <stdio.h>
#include <string.h>
#include <stddef.h>
#include <stdlib.h>
#include <ctype.h>

#ifdef __GNUC__
#define NORETURN __attribute__((noreturn))
#else
#define NORETURN
#endif

/* always be prepared to generate an 8-bit scanner */
#define FLEX_8_BIT_CHARS

#ifdef FLEX_8_BIT_CHARS
#define CSIZE 256
#define Char unsigned char
#else
#define Char char
#define CSIZE 128
#endif

/* size of input alphabet - should be size of ASCII set */
#ifndef DEFAULT_CSIZE
#define DEFAULT_CSIZE 128
#endif


/* maximum line length we'll have to deal with */
#define MAXLINE BUFSIZ

/* maximum size of file name */
#define FILENAMESIZE 1024

#ifndef min
#define min(x,y) ((x) < (y) ? (x) : (y))
#endif
#ifndef max
#define max(x,y) ((x) > (y) ? (x) : (y))
#endif

#define true 1
#define false 0


#ifndef DEFAULT_SKELETON_FILE
#define DEFAULT_SKELETON_FILE "flex.skel"
#endif

/* special chk[] values marking the slots taking by end-of-buffer and action
 * numbers
 */
#define EOB_POSITION -1
#define ACTION_POSITION -2

/* number of data items per line for -f output */
#define NUMDATAITEMS 10

/* number of lines of data in -f output before inserting a blank line for
 * readability.
 */
#define NUMDATALINES 10

/* transition_struct_out() definitions */
#define TRANS_STRUCT_PRINT_LENGTH 15

/* returns true if an nfa state has an epsilon out-transition slot
 * that can be used.  This definition is currently not used.
 */
#define FREE_EPSILON(state) \
	(transchar[state] == SYM_EPSILON && \
	 trans2[state] == NO_TRANSITION && \
	 finalst[state] != state)

/* returns true if an nfa state has an epsilon out-transition character
 * and both slots are free
 */
#define SUPER_FREE_EPSILON(state) \
	(transchar[state] == SYM_EPSILON && \
	 trans1[state] == NO_TRANSITION) \

/* maximum number of NFA states that can comprise a DFA state.  It's real
 * big because if there's a lot of rules, the initial state will have a
 * huge epsilon closure.
 */
#define INITIAL_MAX_DFA_SIZE 750
#define MAX_DFA_SIZE_INCREMENT 750


/* a note on the following masks.  They are used to mark accepting numbers
 * as being special.  As such, they implicitly limit the number of accepting
 * numbers (i.e., rules) because if there are too many rules the rule numbers
 * will overload the mask bits.  Fortunately, this limit is \large/ (0x2000 ==
 * 8192) so unlikely to actually cause any problems.  A check is made in
 * new_rule() to ensure that this limit is not reached.
 */

/* mask to mark a trailing context accepting number */
#define YY_TRAILING_MASK 0x2000

/* mask to mark the accepting number of the "head" of a trailing context rule */
#define YY_TRAILING_HEAD_MASK 0x4000

/* maximum number of rules, as outlined in the above note */
#define MAX_RULE (YY_TRAILING_MASK - 1)


/* NIL must be 0.  If not, its special meaning when making equivalence classes
 * (it marks the representative of a given e.c.) will be unidentifiable
 */
#define NIL 0

#define JAM -1	/* to mark a missing DFA transition */
#define NO_TRANSITION NIL
#define UNIQUE -1	/* marks a symbol as an e.c. representative */
#define INFINITY -1	/* for x{5,} constructions */

#define INITIAL_MAX_CCLS 100	/* max number of unique character classes */
#define MAX_CCLS_INCREMENT 100

/* size of table holding members of character classes */
#define INITIAL_MAX_CCL_TBL_SIZE 500
#define MAX_CCL_TBL_SIZE_INCREMENT 250

#define INITIAL_MAX_RULES 100	/* default maximum number of rules */
#define MAX_RULES_INCREMENT 100

#define INITIAL_MNS 2000	/* default maximum number of nfa states */
#define MNS_INCREMENT 1000	/* amount to bump above by if it's not enough */

#define INITIAL_MAX_DFAS 1000	/* default maximum number of dfa states */
#define MAX_DFAS_INCREMENT 1000

#define JAMSTATE -32766	/* marks a reference to the state that always jams */

/* enough so that if it's subtracted from an NFA state number, the result
 * is guaranteed to be negative
 */
#define MARKER_DIFFERENCE 32000
#define MAXIMUM_MNS 31999

/* maximum number of nxt/chk pairs for non-templates */
#define INITIAL_MAX_XPAIRS 2000
#define MAX_XPAIRS_INCREMENT 2000

/* maximum number of nxt/chk pairs needed for templates */
#define INITIAL_MAX_TEMPLATE_XPAIRS 2500
#define MAX_TEMPLATE_XPAIRS_INCREMENT 2500

#define SYM_EPSILON (CSIZE + 1)	/* to mark transitions on the symbol epsilon */

#define INITIAL_MAX_SCS 40	/* maximum number of start conditions */
#define MAX_SCS_INCREMENT 40	/* amount to bump by if it's not enough */

#define ONE_STACK_SIZE 500	/* stack of states with only one out-transition */
#define SAME_TRANS -1	/* transition is the same as "default" entry for state */

/* the following percentages are used to tune table compression:

 * the percentage the number of out-transitions a state must be of the
 * number of equivalence classes in order to be considered for table
 * compaction by using protos
 */
#define PROTO_SIZE_PERCENTAGE 15

/* the percentage the number of homogeneous out-transitions of a state
 * must be of the number of total out-transitions of the state in order
 * that the state's transition table is first compared with a potential 
 * template of the most common out-transition instead of with the first
 * proto in the proto queue
 */
#define CHECK_COM_PERCENTAGE 50

/* the percentage the number of differences between a state's transition
 * table and the proto it was first compared with must be of the total
 * number of out-transitions of the state in order to keep the first
 * proto as a good match and not search any further
 */
#define FIRST_MATCH_DIFF_PERCENTAGE 10

/* the percentage the number of differences between a state's transition
 * table and the most similar proto must be of the state's total number
 * of out-transitions to use the proto as an acceptable close match
 */
#define ACCEPTABLE_DIFF_PERCENTAGE 50

/* the percentage the number of homogeneous out-transitions of a state
 * must be of the number of total out-transitions of the state in order
 * to consider making a template from the state
 */
#define TEMPLATE_SAME_PERCENTAGE 60

/* the percentage the number of differences between a state's transition
 * table and the most similar proto must be of the state's total number
 * of out-transitions to create a new proto from the state
 */
#define NEW_PROTO_DIFF_PERCENTAGE 20

/* the percentage the total number of out-transitions of a state must be
 * of the number of equivalence classes in order to consider trying to
 * fit the transition table into "holes" inside the nxt/chk table.
 */
#define INTERIOR_FIT_PERCENTAGE 15

/* size of region set aside to cache the complete transition table of
 * protos on the proto queue to enable quick comparisons
 */
#define PROT_SAVE_SIZE 2000

#define MSP 50	/* maximum number of saved protos (protos on the proto queue) */

/* maximum number of out-transitions a state can have that we'll rummage
 * around through the interior of the internal fast table looking for a
 * spot for it
 */
#define MAX_XTIONS_FULL_INTERIOR_FIT 4

/* maximum number of rules which will be reported as being associated
 * with a DFA state
 */
#define MAX_ASSOC_RULES 100

/* number that, if used to subscript an array, has a good chance of producing
 * an error; should be small enough to fit into a short
 */
#define BAD_SUBSCRIPT -32767

/* absolute value of largest number that can be stored in a short, with a
 * bit of slop thrown in for general paranoia.
 */
#define MAX_SHORT 32766


/* Declarations for global variables. */

/* variables for symbol tables:
 * sctbl - start-condition symbol table
 * ndtbl - name-definition symbol table
 * ccltab - character class text symbol table
 */

struct hash_entry
    {
    struct hash_entry *prev, *next;
    char *name;
    char *str_val;
    int int_val;
    } ;

typedef struct hash_entry *hash_table[];

#define NAME_TABLE_HASH_SIZE 101
#define START_COND_HASH_SIZE 101
#define CCL_HASH_SIZE 101

extern struct hash_entry *ndtbl[NAME_TABLE_HASH_SIZE]; 
extern struct hash_entry *sctbl[START_COND_HASH_SIZE];
extern struct hash_entry *ccltab[CCL_HASH_SIZE];


/* variables for flags:
 * printstats - if true (-v), dump statistics
 * syntaxerror - true if a syntax error has been found
 * eofseen - true if we've seen an eof in the input file
 * ddebug - if true (-d), make a "debug" scanner
 * trace - if true (-T), trace processing
 * spprdflt - if true (-s), suppress the default rule
 * interactive - if true (-I), generate an interactive scanner
 * caseins - if true (-i), generate a case-insensitive scanner
 * useecs - if true (-Ce flag), use equivalence classes
 * fulltbl - if true (-Cf flag), don't compress the DFA state table
 * usemecs - if true (-Cm flag), use meta-equivalence classes
 * fullspd - if true (-F flag), use Jacobson method of table representation
 * gen_line_dirs - if true (i.e., no -L flag), generate #line directives
 * performance_report - if true (i.e., -p flag), generate a report relating
 *   to scanner performance
 * backtrack_report - if true (i.e., -b flag), generate "lex.backtrack" file
 *   listing backtracking states
 * csize - size of character set for the scanner we're generating;
 *   128 for 7-bit chars and 256 for 8-bit
 * yymore_used - if true, yymore() is used in input rules
 * reject - if true, generate backtracking tables for REJECT macro
 * real_reject - if true, scanner really uses REJECT (as opposed to just
 *   having "reject" set for variable trailing context)
 * continued_action - true if this rule's action is to "fall through" to
 *   the next rule's action (i.e., the '|' action)
 * yymore_really_used - has a REALLY_xxx value indicating whether a
 *   %used or %notused was used with yymore()
 * reject_really_used - same for REJECT
 */

extern int printstats, syntaxerror, eofseen, ddebug, trace, spprdflt;
extern int interactive, caseins, useecs, fulltbl, usemecs;
extern int fullspd, gen_line_dirs, performance_report, backtrack_report, csize;
extern int yymore_used, reject, real_reject, continued_action;

#define REALLY_NOT_DETERMINED 0
#define REALLY_USED 1
#define REALLY_NOT_USED 2
extern int yymore_really_used, reject_really_used;


/* variables used in the flex input routines:
 * datapos - characters on current output line
 * dataline - number of contiguous lines of data in current data
 *    statement.  Used to generate readable -f output
 * linenum - current input line number
 * skelfile - the skeleton file
 * yyin - input file
 * temp_action_file - temporary file to hold actions
 * backtrack_file - file to summarize backtracking states to
 * infilename - name of input file
 * input_files - array holding names of input files
 * num_input_files - size of input_files array
 * program_name - name with which program was invoked 
 */

extern int datapos, dataline, linenum;
extern FILE *skelfile, *yyin, *temp_action_file, *backtrack_file;
extern char *infilename;
extern char **input_files;
extern int num_input_files;
extern char *program_name;


/* variables for stack of states having only one out-transition:
 * onestate - state number
 * onesym - transition symbol
 * onenext - target state
 * onedef - default base entry
 * onesp - stack pointer
 */

extern int onestate[ONE_STACK_SIZE], onesym[ONE_STACK_SIZE];
extern int onenext[ONE_STACK_SIZE], onedef[ONE_STACK_SIZE], onesp;


/* variables for nfa machine data:
 * current_mns - current maximum on number of NFA states
 * num_rules - number of the last accepting state; also is number of
 *             rules created so far
 * current_max_rules - current maximum number of rules
 * lastnfa - last nfa state number created
 * firstst - physically the first state of a fragment
 * lastst - last physical state of fragment
 * finalst - last logical state of fragment
 * transchar - transition character
 * trans1 - transition state
 * trans2 - 2nd transition state for epsilons
 * accptnum - accepting number
 * assoc_rule - rule associated with this NFA state (or 0 if none)
 * state_type - a STATE_xxx type identifying whether the state is part
 *              of a normal rule, the leading state in a trailing context
 *              rule (i.e., the state which marks the transition from
 *              recognizing the text-to-be-matched to the beginning of
 *              the trailing context), or a subsequent state in a trailing
 *              context rule
 * rule_type - a RULE_xxx type identifying whether this a a ho-hum
 *             normal rule or one which has variable head & trailing
 *             context
 * rule_linenum - line number associated with rule
 */

extern int current_mns, num_rules, current_max_rules, lastnfa;
extern int *firstst, *lastst, *finalst, *transchar, *trans1, *trans2;
extern int *accptnum, *assoc_rule, *state_type, *rule_type, *rule_linenum;

/* different types of states; values are useful as masks, as well, for
 * routines like check_trailing_context()
 */
#define STATE_NORMAL 0x1
#define STATE_TRAILING_CONTEXT 0x2

/* global holding current type of state we're making */

extern int current_state_type;

/* different types of rules */
#define RULE_NORMAL 0
#define RULE_VARIABLE 1

/* true if the input rules include a rule with both variable-length head
 * and trailing context, false otherwise
 */
extern int variable_trailing_context_rules;


/* variables for protos:
 * numtemps - number of templates created
 * numprots - number of protos created
 * protprev - backlink to a more-recently used proto
 * protnext - forward link to a less-recently used proto
 * prottbl - base/def table entry for proto
 * protcomst - common state of proto
 * firstprot - number of the most recently used proto
 * lastprot - number of the least recently used proto
 * protsave contains the entire state array for protos
 */

extern int numtemps, numprots, protprev[MSP], protnext[MSP], prottbl[MSP];
extern int protcomst[MSP], firstprot, lastprot, protsave[PROT_SAVE_SIZE];


/* variables for managing equivalence classes:
 * numecs - number of equivalence classes
 * nextecm - forward link of Equivalence Class members
 * ecgroup - class number or backward link of EC members
 * nummecs - number of meta-equivalence classes (used to compress
 *   templates)
 * tecfwd - forward link of meta-equivalence classes members
 * tecbck - backward link of MEC's
 * xlation - maps character codes to their translations, or nil if no %t table
 * num_xlations - number of different xlation values
 */

/* reserve enough room in the equivalence class arrays so that we
 * can use the CSIZE'th element to hold equivalence class information
 * for the NUL character.  Later we'll move this information into
 * the 0th element.
 */
extern int numecs, nextecm[CSIZE + 1], ecgroup[CSIZE + 1], nummecs;

/* meta-equivalence classes are indexed starting at 1, so it's possible
 * that they will require positions from 1 .. CSIZE, i.e., CSIZE + 1
 * slots total (since the arrays are 0-based).  nextecm[] and ecgroup[]
 * don't require the extra position since they're indexed from 1 .. CSIZE - 1.
 */
extern int tecfwd[CSIZE + 1], tecbck[CSIZE + 1];

extern int *xlation;
extern int num_xlations;


/* variables for start conditions:
 * lastsc - last start condition created
 * current_max_scs - current limit on number of start conditions
 * scset - set of rules active in start condition
 * scbol - set of rules active only at the beginning of line in a s.c.
 * scxclu - true if start condition is exclusive
 * sceof - true if start condition has EOF rule
 * scname - start condition name
 * actvsc - stack of active start conditions for the current rule
 */

extern int lastsc, current_max_scs, *scset, *scbol, *scxclu, *sceof, *actvsc;
extern char **scname;


/* variables for dfa machine data:
 * current_max_dfa_size - current maximum number of NFA states in DFA
 * current_max_xpairs - current maximum number of non-template xtion pairs
 * current_max_template_xpairs - current maximum number of template pairs
 * current_max_dfas - current maximum number DFA states
 * lastdfa - last dfa state number created
 * nxt - state to enter upon reading character
 * chk - check value to see if "nxt" applies
 * tnxt - internal nxt table for templates
 * base - offset into "nxt" for given state
 * def - where to go if "chk" disallows "nxt" entry
 * nultrans - NUL transition for each state
 * NUL_ec - equivalence class of the NUL character
 * tblend - last "nxt/chk" table entry being used
 * firstfree - first empty entry in "nxt/chk" table
 * dss - nfa state set for each dfa
 * dfasiz - size of nfa state set for each dfa
 * dfaacc - accepting set for each dfa state (or accepting number, if
 *    -r is not given)
 * accsiz - size of accepting set for each dfa state
 * dhash - dfa state hash value
 * numas - number of DFA accepting states created; note that this
 *    is not necessarily the same value as num_rules, which is the analogous
 *    value for the NFA
 * numsnpairs - number of state/nextstate transition pairs
 * jambase - position in base/def where the default jam table starts
 * jamstate - state number corresponding to "jam" state
 * end_of_buffer_state - end-of-buffer dfa state number
 */

extern int current_max_dfa_size, current_max_xpairs;
extern int current_max_template_xpairs, current_max_dfas;
extern int lastdfa, lasttemp, *nxt, *chk, *tnxt;
extern int *base, *def, *nultrans, NUL_ec, tblend, firstfree, **dss, *dfasiz;
extern union dfaacc_union
    {
    int *dfaacc_set;
    int dfaacc_state;
    } *dfaacc;
extern int *accsiz, *dhash, numas;
extern int numsnpairs, jambase, jamstate;
extern int end_of_buffer_state;

/* variables for ccl information:
 * lastccl - ccl index of the last created ccl
 * current_maxccls - current limit on the maximum number of unique ccl's
 * cclmap - maps a ccl index to its set pointer
 * ccllen - gives the length of a ccl
 * cclng - true for a given ccl if the ccl is negated
 * cclreuse - counts how many times a ccl is re-used
 * current_max_ccl_tbl_size - current limit on number of characters needed
 *	to represent the unique ccl's
 * ccltbl - holds the characters in each ccl - indexed by cclmap
 */

extern int lastccl, current_maxccls, *cclmap, *ccllen, *cclng, cclreuse;
extern int current_max_ccl_tbl_size;
extern Char *ccltbl;


/* variables for miscellaneous information:
 * starttime - real-time when we started
 * endtime - real-time when we ended
 * nmstr - last NAME scanned by the scanner
 * sectnum - section number currently being parsed
 * nummt - number of empty nxt/chk table entries
 * hshcol - number of hash collisions detected by snstods
 * dfaeql - number of times a newly created dfa was equal to an old one
 * numeps - number of epsilon NFA states created
 * eps2 - number of epsilon states which have 2 out-transitions
 * num_reallocs - number of times it was necessary to realloc() a group
 *		  of arrays
 * tmpuses - number of DFA states that chain to templates
 * totnst - total number of NFA states used to make DFA states
 * peakpairs - peak number of transition pairs we had to store internally
 * numuniq - number of unique transitions
 * numdup - number of duplicate transitions
 * hshsave - number of hash collisions saved by checking number of states
 * num_backtracking - number of DFA states requiring back-tracking
 * bol_needed - whether scanner needs beginning-of-line recognition
 */

extern char *starttime, *endtime, nmstr[MAXLINE];
extern int sectnum, nummt, hshcol, dfaeql, numeps, eps2, num_reallocs;
extern int tmpuses, totnst, peakpairs, numuniq, numdup, hshsave;
extern int num_backtracking, bol_needed;

void *allocate_array(int size, int element_size);
void *reallocate_array(void *array, int size, int element_size);

#define allocate_integer_array(size) \
	(int *) allocate_array( size, sizeof( int ) )

#define reallocate_integer_array(array,size) \
	(int *) reallocate_array( (void *) array, size, sizeof( int ) )

#define allocate_int_ptr_array(size) \
	(int **) allocate_array( size, sizeof( int * ) )

#define allocate_char_ptr_array(size) \
	(char **) allocate_array( size, sizeof( char * ) )

#define allocate_dfaacc_union(size) \
	(union dfaacc_union *) \
		allocate_array( size, sizeof( union dfaacc_union ) )

#define reallocate_int_ptr_array(array,size) \
	(int **) reallocate_array( (void *) array, size, sizeof( int * ) )

#define reallocate_char_ptr_array(array,size) \
	(char **) reallocate_array( (void *) array, size, sizeof( char * ) )

#define reallocate_dfaacc_union(array, size) \
	(union dfaacc_union *) \
	reallocate_array( (void *) array, size, sizeof( union dfaacc_union ) )

#define allocate_character_array(size) \
	(Char *) allocate_array( size, sizeof( Char ) )

#define reallocate_character_array(array,size) \
	(Char *) reallocate_array( (void *) array, size, sizeof( Char ) )

#if 0 /* JRW this might couse truuble... but not for IOC usage */
/* used to communicate between scanner and parser.  The type should really
 * be YYSTYPE, but we can't easily get our hands on it.
 */
#ifdef __alpha		/* inconsistency with parse.y, line 57... on Alpha */
extern long yylval;
#else
extern int yylval;
#endif
#endif


/* external functions that are cross-referenced among the flex source files */


/* from file ccl.c */

extern void ccladd (int, int);	/* Add a single character to a ccl */
extern int cclinit (void);	/* make an empty ccl */
extern void cclnegate (int);	/* negate a ccl */

/* list the members of a set of characters in CCL form */
extern void list_character_set (FILE*, int[]);


/* from file dfa.c */

/* increase the maximum number of dfas */
extern void increase_max_dfas (void);

extern void ntod (void);	/* convert a ndfa to a dfa */


/* from file ecs.c */

/* convert character classes to set of equivalence classes */
extern void ccl2ecl (void);

/* associate equivalence class numbers with class members */
extern int cre8ecs (int[], int[], int);

/* associate equivalence class numbers using %t table */
extern int ecs_from_xlation (int[]);

/* update equivalence classes based on character class transitions */
extern void mkeccl (Char[], int, int[], int[], int, int);

/* create equivalence class for single character */
extern void mkechar (int, int[], int[]);


/* from file gen.c */

extern void make_tables (void);	/* generate transition tables */


/* from file main.c */

extern void flexend (int) NORETURN;


/* from file misc.c */

/* write out the actions from the temporary file to lex.yy.c */
extern void action_out (void);

/* true if a string is all lower case */
extern int all_lower (Char *);

/* true if a string is all upper case */
extern int all_upper (Char *);

/* bubble sort an integer array */
extern void bubble (int [], int);

/* shell sort a character array */
extern void cshell (Char [], int, int);

extern void dataend (void);	/* finish up a block of data declarations */

/* report an error message and terminate */
extern void flexerror (char[]) NORETURN;

/* report a fatal error message and terminate */
extern void flexfatal (char[]);

/* report an error message formatted with one integer argument */
extern void lerrif (char[], int);

/* report an error message formatted with one string argument */
extern void lerrsf (char[], char[]);

/* spit out a "# line" statement */
extern void line_directive_out (FILE*);

/* generate a data statment for a two-dimensional array */
extern void mk2data (int);

extern void mkdata (int);	/* generate a data statement */

/* return the integer represented by a string of digits */
extern int myctoi (Char []);

/* write out one section of the skeleton file */
extern void skelout (void);

/* output a yy_trans_info structure */
extern void transition_struct_out (int, int);


/* from file nfa.c */

/* add an accepting state to a machine */
extern void add_accept (int, int);

/* make a given number of copies of a singleton machine */
extern int copysingl (int, int);

/* debugging routine to write out an nfa */
extern void dumpnfa (int);

/* finish up the processing for a rule */
extern void finish_rule (int, int, int, int);

/* connect two machines together */
extern int link_machines (int, int);

/* mark each "beginning" state in a machine as being a "normal" (i.e.,
 * not trailing context associated) state
 */
extern void mark_beginning_as_normal (int);

/* make a machine that branches to two machines */
extern int mkbranch (int, int);

extern int mkclos (int);	/* convert a machine into a closure */
extern int mkopt (int);	/* make a machine optional */

/* make a machine that matches either one of two machines */
extern int mkor (int, int);

/* convert a machine into a positive closure */
extern int mkposcl (int);

extern int mkrep (int, int, int);	/* make a replicated machine */

/* create a state with a transition on a given symbol */
extern int mkstate (int);

extern void new_rule (void);	/* initialize for a new rule */


/* from file parse.y */

/* write out a message formatted with one string, pinpointing its location */
extern void format_pinpoint_message (char[], char[]);

/* write out a message, pinpointing its location */
extern void pinpoint_message (char[]);

extern void synerr (char []);	/* report a syntax error */
/* extern int yyparse ();*/ 	/* the YACC parser */


/* from file scan.l */

extern int flexscan ();	/* the Flex-generated scanner for flex */

/* open the given file (if NULL, stdin) for scanning */
extern void set_input_file (char*);

extern int yywrap ();	/* wrapup a file in the lexical analyzer */


/* from file sym.c */

/* save the text of a character class */
extern void cclinstal (Char [], int);

/* lookup the number associated with character class */
extern int ccllookup (Char []);

extern void ndinstal (char[], Char[]);	/* install a name definition */
extern void scinstal (char[], int);	/* make a start condition */

/* lookup the number associated with a start condition */
extern int sclookup (char[]);


/* from file tblcmp.c */

/* build table entries for dfa state */
extern void bldtbl (int[], int, int, int, int);

extern void cmptmps (void);	/* compress template table entries */
extern void inittbl (void);	/* initialize transition tables */
extern void mkdeftbl (void);	/* make the default, "jam" table entries */

/* create table entries for a state (or state fragment) which has
 * only one out-transition */
extern void mk1tbl (int, int, int, int);

/* place a state into full speed transition table */
extern void place_state (int*, int, int);

/* save states with only one out-transition to be processed later */
extern void stack1 (int, int, int, int);


/* from file yylex.c */

extern int yylex ();


/* The Unix kernel calls used here */

extern int read (int, char*, int);
#ifndef _WIN32
extern int unlink (char*);
#endif
extern int write (int, char*, int);


#endif /* INC_flexdef_H */

