/* dlgauto.h automaton
 *
 * SOFTWARE RIGHTS
 *
 * We reserve no LEGAL rights to the Purdue Compiler Construction Tool
 * Set (PCCTS) -- PCCTS is in the public domain.  An individual or
 * company may do whatever they wish with source code distributed with
 * PCCTS or the code generated by PCCTS, including the incorporation of
 * PCCTS, or its output, into commerical software.
 * 
 * We encourage users to develop software with PCCTS.  However, we do ask
 * that credit is given to us for developing PCCTS.  By "credit",
 * we mean that if you incorporate our source code into one of your
 * programs (commercial product, research project, or otherwise) that you
 * acknowledge this fact somewhere in the documentation, research report,
 * etc...  If you like PCCTS and have developed a nice tool with the
 * output, please mention that you developed it using PCCTS.  In
 * addition, we ask that this header remain intact in our source code.
 * As long as these guidelines are kept, we expect to continue enhancing
 * this system and expect to make other tools available as they are
 * completed.
 *
 * ANTLR 1.33
 * Will Cohen and Terence Parr
 * Parr Research Corporation
 * with Purdue University and AHPCRC, University of Minnesota
 * 1989-1995
 */

#ifndef ZZDEFAUTO_H
#define ZZDEFAUTO_H

zzchar_t	*zzlextext;	/* text of most recently matched token */
zzchar_t	*zzbegexpr;	/* beginning of last reg expr recogn. */
zzchar_t	*zzendexpr;	/* beginning of last reg expr recogn. */
int	zzbufsize;	/* number of characters in zzlextext */
int	zzbegcol = 0;	/* column that first character of token is in*/
int	zzendcol = 0;	/* column that last character of token is in */
int	zzline = 1;	/* line current token is on */
int	zzreal_line=1;	/* line of 1st portion of token that is not skipped */
int	zzchar;		/* character to determine next state */
int	zzbufovf;	/* indicates that buffer too small for text */
int	zzcharfull = 0;
static zzchar_t	*zznextpos;/* points to next available position in zzlextext*/
static int 	zzclass;

#ifdef __USE_PROTOS
void	zzerrstd(const char *);
void	(*zzerr)(const char *)=zzerrstd;/* pointer to error reporting function */
extern int	zzerr_in(void);
#else
void	zzerrstd();
void	(*zzerr)()=zzerrstd;	/* pointer to error reporting function */
extern int	zzerr_in();
#endif

static FILE	*zzstream_in=0;
static int	(*zzfunc_in)() = zzerr_in;
static zzchar_t	*zzstr_in=0;

#ifdef USER_ZZMODE_STACK
int 	          zzauto = 0;
#else
static int     zzauto = 0;
#endif
static int	zzadd_erase;
static char 	zzebuf[70];

#ifdef ZZCOL
#define ZZINC (++zzendcol)
#else
#define ZZINC
#endif


#define ZZGETC_STREAM {zzchar = getc(zzstream_in); zzclass = ZZSHIFT(zzchar);}
#define ZZGETC_FUNC {zzchar = (*zzfunc_in)(); zzclass = ZZSHIFT(zzchar);}
#define ZZGETC_STR { 			\
	if (*zzstr_in){				\
		zzchar = *zzstr_in;		\
		++zzstr_in;				\
	}else{						\
		zzchar = EOF;			\
	}							\
	zzclass = ZZSHIFT(zzchar);	\
}

#define ZZNEWSTATE	(newstate = dfa[state][zzclass])

#ifndef ZZCOPY
#define ZZCOPY	\
	/* Truncate matching buffer to size (not an error) */	\
	if (zznextpos < lastpos){				\
		*(zznextpos++) = zzchar;			\
	}else{							\
		zzbufovf = 1;					\
	}
#endif

void
#ifdef __USE_PROTOS
zzrdstream( FILE *f )
#else
zzrdstream( f )
FILE *f;
#endif
{
	/* make sure that it is really set to something, otherwise just 
	   leave it be.
	*/
	if (f){
		/* make sure that there is always someplace to get input
		   before closing zzstream_in
		*/
#if 0
		if (zzstream_in && zzstream_in!=stdin) fclose( zzstream_in );
#endif
		zzline = 1;
		zzstream_in = f;
		zzfunc_in = NULL;
		zzstr_in = 0;
		zzcharfull = 0;
	}
}

void
#ifdef __USE_PROTOS
zzrdfunc( int (*f)() )
#else
zzrdfunc( f )
int (*f)();
#endif
{
	/* make sure that it is really set to something, otherwise just 
	   leave it be.
	*/
	if (f){
		/* make sure that there is always someplace to get input
		   before closing zzstream_in
		*/
#if 0
		if (zzstream_in && zzstream_in!=stdin) fclose( zzstream_in );
#endif
		zzline = 1;
		zzstream_in = NULL;
		zzfunc_in = f;
		zzstr_in = 0;
		zzcharfull = 0;
	}
}


void
#ifdef __USE_PROTOS
zzrdstr( zzchar_t *s )
#else
zzrdstr( s )
zzchar_t *s;
#endif
{
	/* make sure that it is really set to something, otherwise just 
	   leave it be.
	*/
	if (s){
		/* make sure that there is always someplace to get input
		   before closing zzstream_in
		*/
#if 0
		if (zzstream_in && zzstream_in!=stdin) fclose( zzstream_in );
#endif
		zzline = 1;
		zzstream_in = NULL;
		zzfunc_in = 0;
		zzstr_in = s;
		zzcharfull = 0;
	}
}


void
zzclose_stream()
{
#if 0
	fclose( zzstream_in );
	zzstream_in = NULL;
	zzfunc_in = NULL;
#endif
}

/* saves dlg state, but not what feeds dlg (such as file position) */
void
#ifdef __USE_PROTOS
zzsave_dlg_state(struct zzdlg_state *state)
#else
zzsave_dlg_state(state)
struct zzdlg_state *state;
#endif
{
	state->stream = zzstream_in;
	state->func_ptr = zzfunc_in;
	state->str = zzstr_in;
	state->auto_num = zzauto;
	state->add_erase = zzadd_erase;
	state->lookc = zzchar;
	state->char_full = zzcharfull;
	state->begcol = zzbegcol;
	state->endcol = zzendcol;
	state->line = zzline;
	state->lextext = zzlextext;
	state->begexpr = zzbegexpr;
	state->endexpr = zzendexpr;
	state->bufsize = zzbufsize;
	state->bufovf = zzbufovf;
	state->nextpos = zznextpos;
	state->class_num = zzclass;
}

void
#ifdef __USE_PROTOS
zzrestore_dlg_state(struct zzdlg_state *state)
#else
zzrestore_dlg_state(state)
struct zzdlg_state *state;
#endif
{
	zzstream_in = state->stream;
	zzfunc_in = state->func_ptr;
	zzstr_in = state->str;
	zzauto = state->auto_num;
	zzadd_erase = state->add_erase;
	zzchar = state->lookc;
	zzcharfull = state->char_full;
	zzbegcol = state->begcol;
	zzendcol = state->endcol;
	zzline = state->line;
	zzlextext = state->lextext;
	zzbegexpr = state->begexpr;
	zzendexpr = state->endexpr;
	zzbufsize = state->bufsize;
	zzbufovf = state->bufovf;
	zznextpos = state->nextpos;
	zzclass = state->class_num;
}

void
#ifdef __USE_PROTOS
zzmode( int m )
#else
zzmode( m )
int m;
#endif
{
	/* points to base of dfa table */
	if (m<MAX_MODE){
		zzauto = m;
		/* have to redo class since using different compression */
		zzclass = ZZSHIFT(zzchar);
	}else{
		sprintf(zzebuf,"Invalid automaton mode = %d ",m);
		zzerr(zzebuf);
	}
}

/* erase what is currently in the buffer, and get a new reg. expr */
void
zzskip()
{
	zzadd_erase = 1;
}

/* don't erase what is in the zzlextext buffer, add on to it */
void
zzmore()
{
	zzadd_erase = 2;
}

/* substitute c for the reg. expr last matched and is in the buffer */
#ifdef __USE_PROTOS
void
zzreplchar(zzchar_t c)
#else
void
zzreplchar(c)
zzchar_t c;
#endif
{
	/* can't allow overwriting null at end of string */
	if (zzbegexpr < &zzlextext[zzbufsize-1]){
		*zzbegexpr = c;
		*(zzbegexpr+1) = '\0';
	}
	zzendexpr = zzbegexpr;
	zznextpos = zzbegexpr + 1;
}

/* replace the string s for the reg. expr last matched and in the buffer */
void
#ifdef __USE_PROTOS
zzreplstr(register zzchar_t *s)
#else
zzreplstr(s)
register zzchar_t *s;
#endif
{
	register zzchar_t *l= &zzlextext[zzbufsize -1];

	zznextpos = zzbegexpr;
	if (s){
	 	while ((zznextpos <= l) && (*(zznextpos++) = *(s++))!=0){
			/* empty */
		}
		/* correct for NULL at end of string */
		zznextpos--;
	}
	if ((zznextpos <= l) && (*(--s) == 0)){
		zzbufovf = 0;
	}else{
		zzbufovf = 1;
	}
	*(zznextpos) = '\0';
	zzendexpr = zznextpos - 1;
}

void
zzgettok()
{
	register int state, newstate;
	/* last space reserved for the null char */
	register zzchar_t *lastpos;

skip:
	zzreal_line = zzline;
	zzbufovf = 0;
	lastpos = &zzlextext[zzbufsize-1];
	zznextpos = zzlextext;
	zzbegcol = zzendcol+1;
more:
	zzbegexpr = zznextpos;
#ifdef ZZINTERACTIVE
	/* interactive version of automaton */
	/* if there is something in zzchar, process it */
	state = newstate = dfa_base[zzauto];
	if (zzcharfull){
		ZZINC;
		ZZCOPY;
		ZZNEWSTATE;
	}
	if (zzstr_in)
		while (zzalternatives[newstate]){
			state = newstate;
			ZZGETC_STR;
			ZZINC;
			ZZCOPY;
			ZZNEWSTATE;
		}
	else if (zzstream_in)
		while (zzalternatives[newstate]){
			state = newstate;
			ZZGETC_STREAM;
			ZZINC;
			ZZCOPY;
			ZZNEWSTATE;
		}
	else if (zzfunc_in)
		while (zzalternatives[newstate]){
			state = newstate;
			ZZGETC_FUNC;
			ZZINC;
			ZZCOPY;
			ZZNEWSTATE;
		}
	/* figure out if last character really part of token */
	if ((state != dfa_base[zzauto]) && (newstate == DfaStates)){
		zzcharfull = 1;
		--zznextpos;
	}else{
		zzcharfull = 0;
		state = newstate;
	}
	*(zznextpos) = '\0';
	/* Able to transition out of start state to some non err state?*/
	if ( state == dfa_base[zzauto] ){
		/* make sure doesn't get stuck */
		zzadvance();
	}
#else
	/* non-interactive version of automaton */
	if (!zzcharfull)
		zzadvance();
	else
		ZZINC;
	state = dfa_base[zzauto];
	if (zzstr_in)
		while (ZZNEWSTATE != DfaStates){
			state = newstate;
			ZZCOPY;
			ZZGETC_STR;
			ZZINC;
		}
	else if (zzstream_in)
		while (ZZNEWSTATE != DfaStates){
			state = newstate;
			ZZCOPY;
			ZZGETC_STREAM;
			ZZINC;
		}
	else if (zzfunc_in)
		while (ZZNEWSTATE != DfaStates){
			state = newstate;
			ZZCOPY;
			ZZGETC_FUNC;
			ZZINC;
		}
	zzcharfull = 1;
	if ( state == dfa_base[zzauto] ){
		if (zznextpos < lastpos){
			*(zznextpos++) = zzchar;
		}else{
			zzbufovf = 1;
		}
		*zznextpos = '\0';
		/* make sure doesn't get stuck */
		zzadvance();
	}else{
		*zznextpos = '\0';
	}
#endif
#ifdef ZZCOL
	zzendcol -= zzcharfull;
#endif
	zzendexpr = zznextpos -1;
	zzadd_erase = 0;
	(*actions[accepts[state]])();
	switch (zzadd_erase) {
		case 1: goto skip;
		case 2: goto more;
	}
}

void
zzadvance()
{
	if (zzstream_in) { ZZGETC_STREAM; zzcharfull = 1; ZZINC;}
	if (zzfunc_in) { ZZGETC_FUNC; zzcharfull = 1; ZZINC;}
	if (zzstr_in) { ZZGETC_STR; zzcharfull = 1; ZZINC;}
	if (!(zzstream_in || zzfunc_in || zzstr_in)){
		zzerr_in();
	}
}

void
#ifdef __USE_PROTOS
zzerrstd(const char *s)
#else
zzerrstd(s)
char *s;
#endif
{
        fprintf(stderr,
                "%s near line %d (text was '%s')\n",
                ((s == NULL) ? "Lexical error" : s),
                zzline,zzlextext);
}

int
zzerr_in()
{
	fprintf(stderr,"No input stream, function, or string\n");
	/* return eof to get out gracefully */
	return EOF;
}

#endif