File: push.skel

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btyacc 3.0-2
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%% banner
/*
**    "@(#)push.skel, based on byacc 1.8 (Berkeley) 01/20/91";
*/
#define YYBTYACC 1

%% header
#define yyclearin (yychar=(-1))
#define yyerrok (yyerrflag=0)
/*  #ifdef YYSTACKSIZE
    #ifndef YYMAXDEPTH
    #define YYMAXDEPTH YYSTACKSIZE
    #endif
    #else
    #ifdef YYMAXDEPTH
    #define YYSTACKSIZE YYMAXDEPTH
    #else
    #define YYSTACKSIZE 500
    #define YYMAXDEPTH 500
    #endif
    #endif */
int yydebug;
static struct yyparsestate {
	struct yyparsestate *save;
	int state;
	int errflag;
	short *ssp;
	YYSTYPE *vsp;
	YYSTYPE val;
	short *ss;
	YYSTYPE *vs;
	int lexeme;
	unsigned short stacksize;
	short ctry;
	} *yypstate=0, *yypath=0;
#define yyerrflag (yypstate->errflag)
#define yyssp (yypstate->ssp)
#define yyvsp (yypstate->vsp)
#define yyval (yypstate->val)
#define yyss (yypstate->ss)
#define yyvs (yypstate->vs)
#define yystacksize (yypstate->stacksize)
static YYSTYPE *yylvals=0, *yylvp=0, *yylve=0, *yylvlim=0;
static short *yylexemes=0, *yylexp=0;
#define YYLEX (yylvp<yylve ? yylval=*yylvp++, *yylexp++ :		\
    yytrial ? (yylvp==yylvlim ? yyexpand() : 0), *yylexp = yylex(),	\
	      *yylvp++ = yylval, yylve++, *yylexp++			\
	    : yylex())
extern int yylex(), yyparse();
#define yytrial (yypstate->save)
#ifndef __cplusplus
#define YYSCOPY(t, f, s)	memcpy(t, f, (s)*sizeof(YYSTYPE))
#define YYMORESTACK do { int p = yyssp - yyss;				\
    yystacksize += 16;							\
    yyss = (short *)realloc(yyss, yystacksize * sizeof(short));		\
    yyvs = (YYSTYPE *)realloc(yyvs, yystacksize * sizeof(YYSTYPE));	\
    yyssp = yyss + p;							\
    yyvsp = yyvs + p;							\
    } while (0)
#else  /* C++ */
#define	YYSCOPY(to, from, size)	do { int _i;				\
	for (_i = (size)-1; _i >= 0; _i--)				\
	    (to)[_i] = (from)[_i];					\
				    } while(0)
#define YYMORESTACK do { int p = yyssp - yyss;				\
    short *tss = yyss; YYSTYPE *tvs = yyvs;				\
    yyss = new short[yystacksize + 16];					\
    yyvs = new YYSTYPE[yystacksize + 16];				\
    memcpy(yyss, tss, yystacksize * sizeof(short));			\
    YYSCOPY(yyvs, tvs, yystacksize);					\
    yystacksize += 16;							\
    delete[] tss;							\
    delete[] tvs;							\
    yyssp = yyss + p;							\
    yyvsp = yyvs + p;							\
    } while (0)
#endif /* C++ */

%% body

#ifndef YYNEWSTATE
#ifdef __oldc
static struct yyparsestate *YYNEWSTATE(size)
int size;
#else
static struct yyparsestate *YYNEWSTATE(int size)
#endif /* __oldc */
{
struct yyparsestate *p;

#ifndef __cplusplus
    p = (struct yyparsestate *)malloc(sizeof(struct yyparsestate));
    p->stacksize = size+4;
    p->ss = (short *)malloc((size+4)*sizeof(short));
    p->vs = (YYSTYPE *)malloc((size+4)*sizeof(YYSTYPE));
#else /* C++ */
    p = new yyparsestate;
    p->stacksize = size+4;
    p->ss = new short[size + 4];
    p->vs = new YYSTYPE[size + 4];
#endif /* C++ */
    return p;
}
#endif /* YYNEWSTATE */
#ifndef YYFREESTATE
#ifndef __cplusplus
#define YYFREESTATE(p) (free((p)->ss), free((p)->vs), free(p))
#else /* C++ */
#define YYFREESTATE(p) (delete[] (p)->ss, delete[] (p)->vs, delete (p))
#endif /* C++ */
#endif /* YYFREESTATE */
static int yyexpand()
{
int p = yylvp-yylvals;
int s = yylvlim-yylvals;
    s += 16;
#ifndef __cplusplus
    yylvals = (YYSTYPE *)realloc(yylvals, s*sizeof(YYSTYPE));
    yylexemes = (short *)realloc(yylexemes, s*sizeof(short));
#else /* C++ */
      { short *tl = yylexemes; YYSTYPE *tv = yylvals;
	yylvals = new YYSTYPE[s];
	yylexemes = new short[s];
	memcpy(yylexemes, tl, (s-16)*sizeof(short));
	YYSCOPY(yylvals, tv, s-16);
	delete[] tl;
	delete[] tv; }
#endif /* C++ */
    yylvp = yylve = yylvals + p;
    yylvlim = yylvals + s;
    yylexp = yylexemes + p;
    return 0;
}

#define YYABORT goto yyabort
#define YYACCEPT goto yyaccept
#define YYERROR goto yyerrlab
#define YYVALID do { if (yytrial) goto yyvalid; } while(0)
#ifdef __cplusplus
extern "C" char *getenv(const char *);
#else
extern char *getenv();
#endif
int yyparse(int yychar, YYSTYPE yylval)
{
    int yym, yyn, yystate, yynewerrflag;
#if YYDEBUG
    char *yys;
#endif

    if (yychar < 0) yychar = 0;
    if (!yypstate) {
	/* initialize the parser state */
	yypstate = YYNEWSTATE(12);
	yypath = 0;
	yytrial = 0;
	yyerrflag = 0;
	yylvp = yylve = yylvals;
	yylexp = yylexemes;
	yyssp = yyss;
	yyvsp = yyvs;
	*yyssp = yypstate->state = 0; }
    yystate = yypstate->state;
#if YYDEBUG
    if (yydebug) {
	yys = 0;
	if (yychar <= YYMAXTOKEN) yys = yyname[yychar];
	if (!yys) yys = "illegal-symbol";
	printf("yydebug: state %d, input %d (%s)", yystate,
		yychar, yys);
#ifdef YYDBPR
	printf("<");
	YYDBPR(yylval);
	printf(">");
#endif
	printf("\n"); }
#endif
    if (yystate == YYFINAL && yychar == 0)
	goto yyaccept;
    if (yytrial) {
	if (yylvp == yylvlim) yyexpand();
	*yylvp++ = yylval;
	yylve++;
	*yylexp++ = yychar; }
yyloop:
    if ((yyn = yydefred[yystate])) goto yyreduce;
    if (yychar < 0) {
	if (yylvp < yylve) {
	    yylval = *yylvp++;
	    yychar = *yylexp++; }
	else {
	    yypstate->state = yystate;
	    return 0; }
#if YYDEBUG
	if (yydebug) {
	    yys = 0;
	    if (yychar <= YYMAXTOKEN) yys = yyname[yychar];
	    if (!yys) yys = "illegal-symbol";
	    printf("yydebug: state %d, reading %d (%s)", yystate,
		    yychar, yys);
#ifdef YYDBPR
	    printf("<");
	    YYDBPR(yylval);
	    printf(">");
#endif
	    printf("\n"); }
#endif
	}
    if ((yyn = yycindex[yystate]) &&
	(yyn += yychar) >= 0 &&
	yyn <= YYTABLESIZE &&
	yycheck[yyn] == yychar) {
	    int ctry;
	    struct yyparsestate *save;
#if YYDEBUG
	if (yydebug)
	    printf("yydebug: state %d, conflict%s\n", yystate,
		   yypath ? ", following successful trial parse" :
		       yytrial ? "" : ", starting trial parse");
#endif
	if (yypath) {
	    save = yypath;
	    yypath = save->save;
	    ctry = save->ctry;
	    if (save->state != yystate) goto yyabort;
	    YYFREESTATE(save); }
	else {
	    save = YYNEWSTATE(yyssp - yyss);
	    save->save = yypstate->save;
	    save->state = yystate;
	    save->errflag = yypstate->errflag;
	    save->ssp = save->ss + (yyssp - yyss);
	    save->vsp = save->vs + (yyvsp - yyvs);
	    memcpy(save->ss, yyss, (yyssp - yyss + 1)*sizeof(short));
	    YYSCOPY(save->vs, yyvs, yyssp - yyss + 1);
	    ctry = yytable[yyn];
	    if (yyctable[ctry] == -1) {
#if YYDEBUG
		if (yydebug && yychar >= 0)
		    printf("yydebug: backtracking 1 token\n");
#endif
		ctry++; }
	    save->ctry = ctry;
	    if (!yytrial) {
		if (!yylexemes) {
#ifndef __cplusplus
		    yylexemes = (short *)malloc(16*sizeof(short));
		    yylvals = (YYSTYPE *)malloc(16*sizeof(YYSTYPE));
#else  /* C++ */
		    yylexemes = new short[16];
		    yylvals = new YYSTYPE[16];
#endif /* C++ */
		    yylvlim = yylvals + 16; }
		if (yylvp == yylve) {
		    yylvp = yylve = yylvals;
		    yylexp = yylexemes;
		    if (yychar >= 0) {
			*yylve++ = yylval;
			*yylexp = yychar;
			yychar = -1; } } }
	    if (yychar >= 0) {
		yylvp--, yylexp--;
		yychar = -1; }
	    save->lexeme = yylvp - yylvals;
	    yypstate->save = save; }
	if (yytable[yyn] == ctry) {
#if YYDEBUG
	    if (yydebug)
		printf("yydebug: state %d, shifting to state %d\n",
			yystate, yyctable[ctry]);
#endif
	    if (yychar < 0)
		yylvp++, yylexp++;
	    yychar = -1;
	    if (yyerrflag > 0) --yyerrflag;
	    yystate = yyctable[ctry];
	    goto yyshift; }
	else {
	    yyn = yyctable[ctry];
	    goto yyreduce; } }
    if ((yyn = yysindex[yystate]) &&
	(yyn += yychar) >= 0 &&
	yyn <= YYTABLESIZE &&
	yycheck[yyn] == yychar) {
#if YYDEBUG
	if (yydebug)
	    printf("yydebug: state %d, shifting to state %d\n",
		    yystate, yytable[yyn]);
#endif
	yychar = (-1);
	if (yyerrflag > 0)  --yyerrflag;
	yystate = yytable[yyn];
yyshift:
	if (yyssp >= yyss + yystacksize - 1)
	    YYMORESTACK;
	*++yyssp = yystate;
	*++yyvsp = yylval;
	goto yyloop; }
    if ((yyn = yyrindex[yystate]) &&
	(yyn += yychar) >= 0 &&
	yyn <= YYTABLESIZE &&
	yycheck[yyn] == yychar) {
	yyn = yytable[yyn];
	goto yyreduce; }
    if (yyerrflag) goto yyinrecovery;
    yynewerrflag = 1;
    goto yyerrhandler;
yyerrlab:
    yynewerrflag = 0;
yyerrhandler:
    while (yytrial) { int ctry; struct yyparsestate *save;
#if YYDEBUG
	if (yydebug)
	    printf("yydebug: error in state %d, %s state %d, %d tokens\n",
		   yystate, "backtracking to", yypstate->save->state,
		   (int)(yylvp - yylvals - yypstate->save->lexeme));
#endif
	save = yypstate->save;
	yylvp = yylvals + save->lexeme;
	yylexp = yylexemes + save->lexeme;
	yychar = -1;
	yyssp = yyss + (save->ssp - save->ss);
	yyvsp = yyvs + (save->vsp - save->vs);
	memcpy(yyss, save->ss, (yyssp - yyss + 1) * sizeof(short));
	YYSCOPY(yyvs, save->vs, yyvsp - yyvs + 1);
	ctry = ++save->ctry;
	yystate = save->state;
	if ((yyn = yyctable[ctry]) >= 0) goto yyreduce;
	yypstate->save = save->save;
	YYFREESTATE(save);
#if YYDEBUG
	if (yydebug && !yytrial)
	    printf("yydebug: trial parse failed, entering error mode\n");
#endif
	yynewerrflag = 1; }
    if (yynewerrflag)
	yyerror("syntax error");
yyinrecovery:
    if (yyerrflag < 3) {
	yyerrflag = 3;
	for (;;) {
	    if ((yyn = yysindex[*yyssp]) && (yyn += YYERRCODE) >= 0 &&
		    yyn <= YYTABLESIZE && yycheck[yyn] == YYERRCODE) {
#if YYDEBUG
		if (yydebug)
		    printf("yydebug: state %d, error recovery %s state %d\n",
			   *yyssp, "shifting to", yytable[yyn]);
#endif
		yystate = yytable[yyn];
		goto yyshift; }
	    else {
#if YYDEBUG
		if (yydebug)
		    printf("yydebug: error recovery discarding state %d\n",
			    *yyssp);
#endif
		if (yyssp <= yyss) goto yyabort;
		--yyssp;
		--yyvsp; } } }
    else {
	if (yychar == 0) goto yyabort;
#if YYDEBUG
	if (yydebug) {
	    yys = 0;
	    if (yychar <= YYMAXTOKEN) yys = yyname[yychar];
	    if (!yys) yys = "illegal-symbol";
	    printf("yydebug: state %d, error recovery discards token %d (%s)\n",
		    yystate, yychar, yys); }
#endif
	yychar = (-1);
	goto yyloop; }
yyreduce:
    yym = yylen[yyn];
#if YYDEBUG
    if (yydebug) {
	printf("yydebug: state %d, reducing by rule %d (%s)",
		yystate, yyn, yyrule[yyn]);
#ifdef YYDBPR
	if (yym) {
	    int i;
	    printf("<");
	    for (i=yym; i>0; i--) {
		if (i!=yym) printf(", ");
		YYDBPR(yyvsp[1-i]); }
	    printf(">"); }
#endif
	printf("\n"); }
#endif
    if (yyssp + 1 - yym >= yyss + yystacksize)
	YYMORESTACK;
    yyval = yyvsp[1-yym];
    switch (yyn) {

%% trailer
    }

#if YYDEBUG && defined(YYDBPR)
    if (yydebug) {
	printf("yydebug: after reduction, result is ");
	YYDBPR(yyval);
	printf("\n"); }
#endif
    yyssp -= yym;
    yystate = *yyssp;
    yyvsp -= yym;
    yym = yylhs[yyn];
    if (yystate == 0 && yym == 0) {
#if YYDEBUG
	if (yydebug)
	    printf("yydebug: after reduction, %s from state 0 to state %d\n",
		   "shifting", YYFINAL);
#endif
	yystate = YYFINAL;
	*++yyssp = YYFINAL;
	*++yyvsp = yyval;
	if (yychar == 0) goto yyaccept;
	goto yyloop; }
    if ((yyn = yygindex[yym]) && (yyn += yystate) >= 0 &&
	    yyn <= YYTABLESIZE && yycheck[yyn] == yystate)
	yystate = yytable[yyn];
    else
	yystate = yydgoto[yym];
#if YYDEBUG
    if (yydebug)
	printf("yydebug: after reduction, %s from state %d to state %d\n",
	       "shifting", *yyssp, yystate);
#endif
    if (yyssp >= yyss + yystacksize - 1)
	YYMORESTACK;
    *++yyssp = yystate;
    *++yyvsp = yyval;
    goto yyloop;
yyvalid:
    if (yypath)
	goto yyabort;
    while (yypstate->save) {
	struct yyparsestate *save = yypstate->save;
	yypstate->save = save->save;
	save->save = yypath;
	yypath = save; }
#if YYDEBUG
    if (yydebug)
	printf("yydebug: trial successful, %s state %d, %d tokens\n",
	       "backtracking to", yypath->state,
	       (int)(yylvp - yylvals - yypath->lexeme));
#endif
    yychar = -1;
    yyssp = yyss + (yypath->ssp - yypath->ss);
    yyvsp = yyvs + (yypath->vsp - yypath->vs);
    memcpy(yyss, yypath->ss, (yyssp - yyss + 1) * sizeof(short));
    YYSCOPY(yyvs, yypath->vs, yyvsp - yyvs + 1);
    yylvp = yylvals + yypath->lexeme;
    yylexp = yylexemes + yypath->lexeme;
    yystate = yypath->state;
    goto yyloop;
yyabort:
    while (yypstate) {
	struct yyparsestate *save = yypstate;
	yypstate = save->save;
	YYFREESTATE(save); }
    while (yypath) {
	struct yyparsestate *save = yypath;
	yypath = save->save;
	YYFREESTATE(save); }
    return -1;
yyaccept:
    if (yytrial) goto yyvalid;
    while (yypstate) {
	struct yyparsestate *save = yypstate;
	yypstate = save->save;
	YYFREESTATE(save); }
    while (yypath) {
	struct yyparsestate *save = yypath;
	yypath = save->save;
	YYFREESTATE(save); }
    return 1;
}