/* SCCSWHAT( "@(#)yypars.c 2.4 88/05/09 15:22:59 " ) */ static char *SCCSID = "@(#)yypars.c:1.3"; # define YYFLAG -1000 # define YYERROR goto yyerrlab # define YYACCEPT return(0) # define YYABORT return(1) #ifdef YYDEBUG /* RRR - 10/9/85 */ #define yyprintf(a, b, c, d, e) printf(a, b, c, d, e) #else #define yyprintf(a, b, c, d) #endif #ifndef YYPRINT #define YYPRINT printf #endif #if ! defined YYSTATIC #define YYSTATIC #endif /* parser for yacc output */ #ifdef YYDEBUG YYSTATIC int yydebug = 0; /* 1 for debugging */ #endif YYSTATIC YYSTYPE yyv[YYMAXDEPTH]; /* where the values are stored */ YYSTATIC short yys[YYMAXDEPTH]; /* the parse stack */ YYSTATIC int yychar = -1; /* current input token number */ YYSTATIC int yynerrs = 0; /* number of errors */ YYSTATIC short yyerrflag = 0; /* error recovery flag */ short yyexpected; #ifdef YYRECOVER /* ** yyscpy : copy f onto t and return a ptr to the null terminator at the ** end of t. */ YYSTATIC char *yyscpy(t,f) register char *t, *f; { while(*t = *f++) t++; return(t); /* ptr to the null char */ } #endif #ifndef YYNEAR #define YYNEAR #endif #ifndef YYPASCAL #define YYPASCAL #endif #ifndef YYLOCAL #define YYLOCAL #endif #if ! defined YYPARSER #define YYPARSER yyparse #endif #if ! defined YYLEX #define YYLEX yylex #endif #ifdef VC_ERRORS static short yysavestate = 0; #endif YYLOCAL YYNEAR YYPASCAL YYPARSER() { register short yyn; short yystate, *yyps; YYSTYPE *yypv; short yyj, yym; #ifdef YYDEBUG yydebug = 1; #endif // YYDEBUG yystate = 0; yychar = -1; yynerrs = 0; yyerrflag = 0; yyps= &yys[-1]; yypv= &yyv[-1]; yystack: /* put a state and value onto the stack */ #ifdef YYDEBUG yyprintf( "[yydebug] state %d, char %d = %c\n", yystate, yychar,yychar, 0 ); #else // YYDEBUG yyprintf( "[yydebug] state %d, char %d\n", yystate, yychar, 0 ); #endif // YYDEBUG if( ++yyps > &yys[YYMAXDEPTH] ) { yyerror( "yacc stack overflow" ); return(1); } *yyps = yystate; ++yypv; #ifdef UNION yyunion(yypv, &yyval); #else *yypv = yyval; #endif yynewstate: #ifdef VC_ERRORS yysavestate = yystate; #endif yyn = yypact[yystate]; yyexpected = -yyn; if( yyn <= YYFLAG ) { /* simple state, no lookahead */ goto yydefault; } if( yychar < 0 ) { /* need a lookahead */ yychar = YYLEX(); } if( ((yyn += yychar) < 0) || (yyn >= YYLAST) ) { goto yydefault; } if( yychk[ yyn = yyact[ yyn ] ] == yychar ) { /* valid shift */ yychar = -1; #ifdef UNION yyunion(&yyval, &yylval); #else yyval = yylval; #endif yystate = yyn; if( yyerrflag > 0 ) { --yyerrflag; } goto yystack; } yydefault: /* default state action */ if( (yyn = yydef[yystate]) == -2 ) { register short *yyxi; if( yychar < 0 ) { yychar = YYLEX(); } /* ** search exception table, we find a -1 followed by the current state. ** if we find one, we'll look through terminal,state pairs. if we find ** a terminal which matches the current one, we have a match. ** the exception table is when we have a reduce on a terminal. */ #if YYOPTTIME yyxi = yyexca + yyexcaind[yystate]; while(( *yyxi != yychar ) && ( *yyxi >= 0 )){ yyxi += 2; } #else for(yyxi = yyexca; (*yyxi != (-1)) || (yyxi[1] != yystate); yyxi += 2 ) { ; /* VOID */ } while( *(yyxi += 2) >= 0 ){ if( *yyxi == yychar ) { break; } } #endif if( (yyn = yyxi[1]) < 0 ) { return(0); /* accept */ } } if( yyn == 0 ){ /* error */ /* error ... attempt to resume parsing */ switch( yyerrflag ){ case 0: /* brand new error */ #ifdef YYRECOVER { register int i,j; for(i = 0; (yyrecover[i] != -1000) && (yystate > yyrecover[i]); i += 3 ) { ; } if(yystate == yyrecover[i]) { #ifdef YYDEBUG yyprintf("recovered, from state %d to state %d on token %d\n", yystate,yyrecover[i+2],yyrecover[i+1], 0 ); #else // YYDEBUG yyprintf("recovered, from state %d to state %d on token %d\n", yystate,yyrecover[i+2],yyrecover[i+1] ); #endif // YYDEBUG j = yyrecover[i + 1]; if(j < 0) { /* ** here we have one of the injection set, so we're not quite ** sure that the next valid thing will be a shift. so we'll ** count it as an error and continue. ** actually we're not absolutely sure that the next token ** we were supposed to get is the one when j > 0. for example, ** for(+) {;} error recovery with yyerrflag always set, stops ** after inserting one ; before the +. at the point of the +, ** we're pretty sure the guy wants a 'for' loop. without ** setting the flag, when we're almost absolutely sure, we'll ** give him one, since the only thing we can shift on this ** error is after finding an expression followed by a + */ yyerrflag++; j = -j; } if(yyerrflag <= 1) { /* only on first insertion */ yyrecerr(yychar,j); /* what was, what should be first */ } yyval = yyeval(j); yystate = yyrecover[i + 2]; goto yystack; } } #endif #ifdef VC_ERRORS yyerror("syntax error", yysavestate); #else yyerror("syntax error"); #endif yyerrlab: ++yynerrs; case 1: case 2: /* incompletely recovered error ... try again */ yyerrflag = 3; /* find a state where "error" is a legal shift action */ while ( yyps >= yys ) { yyn = yypact[*yyps] + YYERRCODE; if( yyn>= 0 && yyn < YYLAST && yychk[yyact[yyn]] == YYERRCODE ){ yystate = yyact[yyn]; /* simulate a shift of "error" */ goto yystack; } yyn = yypact[*yyps]; /* the current yyps has no shift onn "error", pop stack */ #ifdef YYDEBUG yyprintf( "error recovery pops state %d, uncovers %d\n", *yyps, yyps[-1], 0, 0 ); #else // YYDEBUG yyprintf( "error recovery pops state %d, uncovers %d\n", *yyps, yyps[-1], 0 ); #endif // YYDEBUG --yyps; --yypv; } /* there is no state on the stack with an error shift ... abort */ yyabort: return(1); case 3: /* no shift yet; clobber input char */ #ifdef YYDEBUG yyprintf( "error recovery discards char %d\n", yychar, 0, 0, 0 ); #else // YYDEBUG yyprintf( "error recovery discards char %d\n", yychar, 0, 0 ); #endif // YYDEBUG if( yychar == 0 ) goto yyabort; /* don't discard EOF, quit */ yychar = -1; goto yynewstate; /* try again in the same state */ } } /* reduction by production yyn */ yyreduce: { register YYSTYPE *yypvt; #ifdef YYDEBUG yyprintf("[yydebug] reduce %d\n",yyn, 0, 0, 0); #else // YYDEBUG yyprintf("[yydebug] reduce %d\n",yyn, 0, 0); #endif // YYDEBUG yypvt = yypv; yyps -= yyr2[yyn]; yypv -= yyr2[yyn]; #ifdef UNION yyunion(&yyval, &yypv[1]); #else yyval = yypv[1]; #endif yym = yyn; yyn = yyr1[yyn]; /* consult goto table to find next state */ yyj = yypgo[yyn] + *yyps + 1; if( (yyj >= YYLAST) || (yychk[ yystate = yyact[yyj] ] != -yyn) ) { yystate = yyact[yypgo[yyn]]; } switch(yym){ $A } } goto yystack; /* stack new state and value */ }