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d8e7dfb2 RH |
1 | #ifndef lint |
2 | static char yaccpar_sccsid[] = "@(#)old.yaccpar 4.1 (Berkeley) %G%"; | |
3 | #endif not lint | |
4 | ||
5 | # | |
6 | # define YYFLAG -1000 | |
7 | # define YYERROR goto yyerrlab | |
8 | # define YYACCEPT return(0) | |
9 | # define YYABORT return(1) | |
10 | ||
11 | /* parser for yacc output */ | |
12 | ||
13 | #ifdef YYDEBUG | |
14 | int yydebug = 0; /* 1 for debugging */ | |
15 | #endif | |
16 | YYSTYPE yyv[YYMAXDEPTH]; /* where the values are stored */ | |
17 | int yychar = -1; /* current input token number */ | |
18 | int yynerrs = 0; /* number of errors */ | |
19 | short yyerrflag = 0; /* error recovery flag */ | |
20 | ||
21 | yyparse() { | |
22 | ||
23 | short yys[YYMAXDEPTH]; | |
24 | short yyj, yym; | |
25 | register YYSTYPE *yypvt; | |
26 | register short yystate, *yyps, yyn; | |
27 | register YYSTYPE *yypv; | |
28 | register short *yyxi; | |
29 | ||
30 | yystate = 0; | |
31 | yychar = -1; | |
32 | yynerrs = 0; | |
33 | yyerrflag = 0; | |
34 | yyps= &yys[-1]; | |
35 | yypv= &yyv[-1]; | |
36 | ||
37 | yystack: /* put a state and value onto the stack */ | |
38 | ||
39 | #ifdef YYDEBUG | |
40 | if( yydebug ) printf( "state %d, char 0%o\n", yystate, yychar ); | |
41 | #endif | |
42 | if( ++yyps> &yys[YYMAXDEPTH] ) { yyerror( "yacc stack overflow" ); return(1); } | |
43 | *yyps = yystate; | |
44 | ++yypv; | |
45 | *yypv = yyval; | |
46 | ||
47 | yynewstate: | |
48 | ||
49 | yyn = yypact[yystate]; | |
50 | ||
51 | if( yyn<= YYFLAG ) goto yydefault; /* simple state */ | |
52 | ||
53 | if( yychar<0 ) if( (yychar=yylex())<0 ) yychar=0; | |
54 | if( (yyn += yychar)<0 || yyn >= YYLAST ) goto yydefault; | |
55 | ||
56 | if( yychk[ yyn=yyact[ yyn ] ] == yychar ){ /* valid shift */ | |
57 | yychar = -1; | |
58 | yyval = yylval; | |
59 | yystate = yyn; | |
60 | if( yyerrflag > 0 ) --yyerrflag; | |
61 | goto yystack; | |
62 | } | |
63 | ||
64 | yydefault: | |
65 | /* default state action */ | |
66 | ||
67 | if( (yyn=yydef[yystate]) == -2 ) { | |
68 | if( yychar<0 ) if( (yychar=yylex())<0 ) yychar = 0; | |
69 | /* look through exception table */ | |
70 | ||
71 | for( yyxi=yyexca; (*yyxi!= (-1)) || (yyxi[1]!=yystate) ; yyxi += 2 ) ; /* VOID */ | |
72 | ||
73 | while( *(yyxi+=2) >= 0 ){ | |
74 | if( *yyxi == yychar ) break; | |
75 | } | |
76 | if( (yyn = yyxi[1]) < 0 ) return(0); /* accept */ | |
77 | } | |
78 | ||
79 | if( yyn == 0 ){ /* error */ | |
80 | /* error ... attempt to resume parsing */ | |
81 | ||
82 | switch( yyerrflag ){ | |
83 | ||
84 | case 0: /* brand new error */ | |
85 | ||
86 | yyerror( "syntax error" ); | |
87 | yyerrlab: | |
88 | ++yynerrs; | |
89 | ||
90 | case 1: | |
91 | case 2: /* incompletely recovered error ... try again */ | |
92 | ||
93 | yyerrflag = 3; | |
94 | ||
95 | /* find a state where "error" is a legal shift action */ | |
96 | ||
97 | while ( yyps >= yys ) { | |
98 | yyn = yypact[*yyps] + YYERRCODE; | |
99 | if( yyn>= 0 && yyn < YYLAST && yychk[yyact[yyn]] == YYERRCODE ){ | |
100 | yystate = yyact[yyn]; /* simulate a shift of "error" */ | |
101 | goto yystack; | |
102 | } | |
103 | yyn = yypact[*yyps]; | |
104 | ||
105 | /* the current yyps has no shift onn "error", pop stack */ | |
106 | ||
107 | #ifdef YYDEBUG | |
108 | if( yydebug ) printf( "error recovery pops state %d, uncovers %d\n", *yyps, yyps[-1] ); | |
109 | #endif | |
110 | --yyps; | |
111 | --yypv; | |
112 | } | |
113 | ||
114 | /* there is no state on the stack with an error shift ... abort */ | |
115 | ||
116 | yyabort: | |
117 | return(1); | |
118 | ||
119 | ||
120 | case 3: /* no shift yet; clobber input char */ | |
121 | ||
122 | #ifdef YYDEBUG | |
123 | if( yydebug ) printf( "error recovery discards char %d\n", yychar ); | |
124 | #endif | |
125 | ||
126 | if( yychar == 0 ) goto yyabort; /* don't discard EOF, quit */ | |
127 | yychar = -1; | |
128 | goto yynewstate; /* try again in the same state */ | |
129 | ||
130 | } | |
131 | ||
132 | } | |
133 | ||
134 | /* reduction by production yyn */ | |
135 | ||
136 | #ifdef YYDEBUG | |
137 | if( yydebug ) printf("reduce %d\n",yyn); | |
138 | #endif | |
139 | yyps -= yyr2[yyn]; | |
140 | yypvt = yypv; | |
141 | yypv -= yyr2[yyn]; | |
142 | yyval = yypv[1]; | |
143 | yym=yyn; | |
144 | /* consult goto table to find next state */ | |
145 | yyn = yyr1[yyn]; | |
146 | yyj = yypgo[yyn] + *yyps + 1; | |
147 | if( yyj>=YYLAST || yychk[ yystate = yyact[yyj] ] != -yyn ) yystate = yyact[yypgo[yyn]]; | |
148 | switch(yym){ | |
149 | $A | |
150 | } | |
151 | goto yystack; /* stack new state and value */ | |
152 | ||
153 | } |