lex.ncform (4139B)
1 /* #pragma lib "libl.a" */ 2 int yylineno =1; 3 # define YYU(x) x 4 char yytext[YYLMAX]; 5 struct yysvf *yylstate [YYLMAX], **yylsp, **yyolsp; 6 Uchar yysbuf[YYLMAX]; 7 Uchar *yysptr = yysbuf; 8 int *yyfnd; 9 extern struct yysvf *yyestate; 10 int yyprevious = YYNEWLINE; 11 # ifdef LEXDEBUG 12 extern void allprint(char); 13 # endif 14 int 15 yylook(void){ 16 struct yysvf *yystate, **lsp; 17 struct yywork *yyt; 18 struct yysvf *yyz; 19 int yych; 20 struct yywork *yyr; 21 # ifdef LEXDEBUG 22 int debug; 23 # endif 24 Uchar *yylastch; 25 /* start off machines */ 26 # ifdef LEXDEBUG 27 debug = 0; 28 # endif 29 if (!yymorfg) 30 yylastch = (Uchar*)yytext; 31 else { 32 yymorfg=0; 33 yylastch = (Uchar*)yytext+yyleng; 34 } 35 for(;;){ 36 lsp = yylstate; 37 yyestate = yystate = yybgin; 38 if (yyprevious==YYNEWLINE) yystate++; 39 for (;;){ 40 # ifdef LEXDEBUG 41 if(debug)fprintf(yyout,"state %d\n",yystate-yysvec-1); 42 # endif 43 yyt = yystate->yystoff; 44 if(yyt == yycrank){ /* may not be any transitions */ 45 yyz = yystate->yyother; 46 if(yyz == 0)break; 47 if(yyz->yystoff == yycrank)break; 48 } 49 *yylastch++ = yych = input(); 50 tryagain: 51 # ifdef LEXDEBUG 52 if(debug){ 53 fprintf(yyout,"char "); 54 allprint(yych); 55 putchar('\n'); 56 } 57 # endif 58 yyr = yyt; 59 if (yyt > yycrank){ 60 yyt = yyr + yych; 61 if (yyt <= yytop && yyt->verify+yysvec == yystate){ 62 if(yyt->advance+yysvec == YYLERR) /* error transitions */ 63 {unput(*--yylastch);break;} 64 *lsp++ = yystate = yyt->advance+yysvec; 65 goto contin; 66 } 67 } 68 # ifdef YYOPTIM 69 else if(yyt < yycrank) { /* r < yycrank */ 70 yyt = yyr = yycrank+(yycrank-yyt); 71 # ifdef LEXDEBUG 72 if(debug)fprintf(yyout,"compressed state\n"); 73 # endif 74 yyt = yyt + yych; 75 if(yyt <= yytop && yyt->verify+yysvec == yystate){ 76 if(yyt->advance+yysvec == YYLERR) /* error transitions */ 77 {unput(*--yylastch);break;} 78 *lsp++ = yystate = yyt->advance+yysvec; 79 goto contin; 80 } 81 yyt = yyr + YYU(yymatch[yych]); 82 # ifdef LEXDEBUG 83 if(debug){ 84 fprintf(yyout,"try fall back character "); 85 allprint(YYU(yymatch[yych])); 86 putchar('\n'); 87 } 88 # endif 89 if(yyt <= yytop && yyt->verify+yysvec == yystate){ 90 if(yyt->advance+yysvec == YYLERR) /* error transition */ 91 {unput(*--yylastch);break;} 92 *lsp++ = yystate = yyt->advance+yysvec; 93 goto contin; 94 } 95 } 96 if ((yystate = yystate->yyother) && (yyt= yystate->yystoff) != yycrank){ 97 # ifdef LEXDEBUG 98 if(debug)fprintf(yyout,"fall back to state %d\n",yystate-yysvec-1); 99 # endif 100 goto tryagain; 101 } 102 # endif 103 else 104 {unput(*--yylastch);break;} 105 contin: 106 # ifdef LEXDEBUG 107 if(debug){ 108 fprintf(yyout,"state %d char ",yystate-yysvec-1); 109 allprint(yych); 110 putchar('\n'); 111 } 112 # endif 113 ; 114 } 115 # ifdef LEXDEBUG 116 if(debug){ 117 fprintf(yyout,"stopped at %d with ",*(lsp-1)-yysvec-1); 118 allprint(yych); 119 putchar('\n'); 120 } 121 # endif 122 while (lsp-- > yylstate){ 123 *yylastch-- = 0; 124 if (*lsp != 0 && (yyfnd= (*lsp)->yystops) && *yyfnd > 0){ 125 yyolsp = lsp; 126 if(yyextra[*yyfnd]){ /* must backup */ 127 while(yyback((*lsp)->yystops,-*yyfnd) != 1 && lsp > yylstate){ 128 lsp--; 129 unput(*yylastch--); 130 } 131 } 132 yyprevious = YYU(*yylastch); 133 yylsp = lsp; 134 yyleng = yylastch-(Uchar*)yytext+1; 135 yytext[yyleng] = 0; 136 # ifdef LEXDEBUG 137 if(debug){ 138 fprintf(yyout,"\nmatch '%s'", yytext); 139 fprintf(yyout," action %d\n",*yyfnd); 140 } 141 # endif 142 return(*yyfnd++); 143 } 144 unput(*yylastch); 145 } 146 if (yytext[0] == 0 /* && feof(yyin) */) 147 { 148 yysptr=yysbuf; 149 return(0); 150 } 151 yyprevious = input(); 152 yytext[0] = yyprevious; 153 if (yyprevious>0) 154 output(yyprevious); 155 yylastch = (Uchar*)yytext; 156 # ifdef LEXDEBUG 157 if(debug)putchar('\n'); 158 # endif 159 } 160 return(0); /* shut up the compiler; i have no idea what should be returned */ 161 } 162 int 163 yyback(int *p, int m) 164 { 165 if (p==0) return(0); 166 while (*p) 167 { 168 if (*p++ == m) 169 return(1); 170 } 171 return(0); 172 } 173 /* the following are only used in the lex library */ 174 int 175 yyinput(void){ 176 if(yyin == ((void*)0)) 177 yyin = stdin; 178 return(input()); 179 } 180 void 181 yyoutput(int c) 182 { 183 if(yyout == ((void*)0)) 184 yyout = stdin; 185 output(c); 186 } 187 void 188 yyunput(int c) 189 { 190 unput(c); 191 }