Commit | Line | Data |
---|---|---|
5e74fd0a KT |
1 | # |
2 | # define YYFLAG -1000 | |
3 | # define YYERROR goto yyerrlab | |
4 | # define YYACCEPT return(0) | |
5 | # define YYABORT return(1) | |
6 | ||
7 | /* parser for yacc output */ | |
8 | ||
9 | int yydebug = 0; /* 1 for debugging */ | |
10 | YYSTYPE yyv[YYMAXDEPTH]; /* where the values are stored */ | |
11 | int yychar = -1; /* current input token number */ | |
12 | int yynerrs = 0; /* number of errors */ | |
13 | short yyerrflag = 0; /* error recovery flag */ | |
14 | ||
15 | yyparse() { | |
16 | ||
17 | short yys[YYMAXDEPTH]; | |
18 | short yyj, yym; | |
19 | register YYSTYPE *yypvt; | |
20 | register short yystate, *yyps, yyn; | |
21 | register YYSTYPE *yypv; | |
22 | register short *yyxi; | |
23 | ||
24 | yystate = 0; | |
25 | yychar = -1; | |
26 | yynerrs = 0; | |
27 | yyerrflag = 0; | |
28 | yyps= &yys[-1]; | |
29 | yypv= &yyv[-1]; | |
30 | ||
31 | yystack: /* put a state and value onto the stack */ | |
32 | ||
33 | if( yydebug ) printf( "state %d, char 0%o\n", yystate, yychar ); | |
34 | if( ++yyps> &yys[YYMAXDEPTH] ) { yyerror( "yacc stack overflow" ); return(1); } | |
35 | *yyps = yystate; | |
36 | ++yypv; | |
37 | *yypv = yyval; | |
38 | ||
39 | yynewstate: | |
40 | ||
41 | yyn = yypact[yystate]; | |
42 | ||
43 | if( yyn<= YYFLAG ) goto yydefault; /* simple state */ | |
44 | ||
45 | if( yychar<0 ) if( (yychar=yylex())<0 ) yychar=0; | |
46 | if( (yyn += yychar)<0 || yyn >= YYLAST ) goto yydefault; | |
47 | ||
48 | if( yychk[ yyn=yyact[ yyn ] ] == yychar ){ /* valid shift */ | |
49 | yychar = -1; | |
50 | yyval = yylval; | |
51 | yystate = yyn; | |
52 | if( yyerrflag > 0 ) --yyerrflag; | |
53 | goto yystack; | |
54 | } | |
55 | ||
56 | yydefault: | |
57 | /* default state action */ | |
58 | ||
59 | if( (yyn=yydef[yystate]) == -2 ) { | |
60 | if( yychar<0 ) if( (yychar=yylex())<0 ) yychar = 0; | |
61 | /* look through exception table */ | |
62 | ||
63 | for( yyxi=yyexca; (*yyxi!= (-1)) || (yyxi[1]!=yystate) ; yyxi += 2 ) ; /* VOID */ | |
64 | ||
65 | while( *(yyxi+=2) >= 0 ){ | |
66 | if( *yyxi == yychar ) break; | |
67 | } | |
68 | if( (yyn = yyxi[1]) < 0 ) return(0); /* accept */ | |
69 | } | |
70 | ||
71 | if( yyn == 0 ){ /* error */ | |
72 | /* error ... attempt to resume parsing */ | |
73 | ||
74 | switch( yyerrflag ){ | |
75 | ||
76 | case 0: /* brand new error */ | |
77 | ||
78 | yyerror( "syntax error" ); | |
79 | yyerrlab: | |
80 | ++yynerrs; | |
81 | ||
82 | case 1: | |
83 | case 2: /* incompletely recovered error ... try again */ | |
84 | ||
85 | yyerrflag = 3; | |
86 | ||
87 | /* find a state where "error" is a legal shift action */ | |
88 | ||
89 | while ( yyps >= yys ) { | |
90 | yyn = yypact[*yyps] + YYERRCODE; | |
91 | if( yyn>= 0 && yyn < YYLAST && yychk[yyact[yyn]] == YYERRCODE ){ | |
92 | yystate = yyact[yyn]; /* simulate a shift of "error" */ | |
93 | goto yystack; | |
94 | } | |
95 | yyn = yypact[*yyps]; | |
96 | ||
97 | /* the current yyps has no shift onn "error", pop stack */ | |
98 | ||
99 | if( yydebug ) printf( "error recovery pops state %d, uncovers %d\n", *yyps, yyps[-1] ); | |
100 | --yyps; | |
101 | --yypv; | |
102 | } | |
103 | ||
104 | /* there is no state on the stack with an error shift ... abort */ | |
105 | ||
106 | yyabort: | |
107 | return(1); | |
108 | ||
109 | ||
110 | case 3: /* no shift yet; clobber input char */ | |
111 | ||
112 | if( yydebug ) printf( "error recovery discards char %d\n", yychar ); | |
113 | ||
114 | if( yychar == 0 ) goto yyabort; /* don't discard EOF, quit */ | |
115 | yychar = -1; | |
116 | goto yynewstate; /* try again in the same state */ | |
117 | ||
118 | } | |
119 | ||
120 | } | |
121 | ||
122 | /* reduction by production yyn */ | |
123 | ||
124 | if( yydebug ) printf("reduce %d\n",yyn); | |
125 | yyps -= yyr2[yyn]; | |
126 | yypvt = yypv; | |
127 | yypv -= yyr2[yyn]; | |
128 | yyval = yypv[1]; | |
129 | yym=yyn; | |
130 | /* consult goto table to find next state */ | |
131 | yyn = yyr1[yyn]; | |
132 | yyj = yypgo[yyn] + *yyps + 1; | |
133 | if( yyj>=YYLAST || yychk[ yystate = yyact[yyj] ] != -yyn ) yystate = yyact[yypgo[yyn]]; | |
134 | switch(yym){ | |
135 | $A | |
136 | } | |
137 | goto yystack; /* stack new state and value */ | |
138 | ||
139 | } |