| 1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | |
| 3 | static char sccsid[] = "@(#)yylex.c 1.1 8/27/80"; |
| 4 | |
| 5 | #include "whoami.h" |
| 6 | #include "0.h" |
| 7 | #include "yy.h" |
| 8 | |
| 9 | /* |
| 10 | * Scanner |
| 11 | */ |
| 12 | int yylacnt; |
| 13 | |
| 14 | #define YYLASIZ 10 |
| 15 | |
| 16 | struct yytok Yla[YYLASIZ]; |
| 17 | |
| 18 | unyylex(y) |
| 19 | struct yylex *y; |
| 20 | { |
| 21 | |
| 22 | if (yylacnt == YYLASIZ) |
| 23 | panic("unyylex"); |
| 24 | copy(&Yla[yylacnt], y, sizeof Yla[0]); |
| 25 | yylacnt++; |
| 26 | |
| 27 | } |
| 28 | |
| 29 | yylex() |
| 30 | { |
| 31 | register c; |
| 32 | register **ip; |
| 33 | register char *cp; |
| 34 | int f; |
| 35 | char delim; |
| 36 | |
| 37 | if (yylacnt != 0) { |
| 38 | yylacnt--; |
| 39 | copy(&Y, &Yla[yylacnt], sizeof Y); |
| 40 | return (yychar); |
| 41 | } |
| 42 | if (c = yysavc) |
| 43 | yysavc = 0; |
| 44 | else |
| 45 | c = readch(); |
| 46 | #ifdef PXP |
| 47 | yytokcnt++; |
| 48 | #endif |
| 49 | |
| 50 | next: |
| 51 | /* |
| 52 | * skip white space |
| 53 | */ |
| 54 | #ifdef PXP |
| 55 | yywhcnt = 0; |
| 56 | #endif |
| 57 | while (c == ' ' || c == '\t') { |
| 58 | #ifdef PXP |
| 59 | if (c == '\t') |
| 60 | yywhcnt++; |
| 61 | yywhcnt++; |
| 62 | #endif |
| 63 | c = readch(); |
| 64 | } |
| 65 | yyecol = yycol; |
| 66 | yyeline = yyline; |
| 67 | yyefile = filename; |
| 68 | yyeseqid = yyseqid; |
| 69 | yyseekp = yylinpt; |
| 70 | cp = token; |
| 71 | yylval = yyline; |
| 72 | switch (c) { |
| 73 | case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': case 'g': |
| 74 | case 'h': case 'i': case 'j': case 'k': case 'l': case 'm': case 'n': |
| 75 | case 'o': case 'p': case 'q': case 'r': case 's': case 't': case 'u': |
| 76 | case 'v': case 'w': case 'x': case 'y': case 'z': |
| 77 | case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': case 'G': |
| 78 | case 'H': case 'I': case 'J': case 'K': case 'L': case 'M': case 'N': |
| 79 | case 'O': case 'P': case 'Q': case 'R': case 'S': case 'T': case 'U': |
| 80 | case 'V': case 'W': case 'X': case 'Y': case 'Z': |
| 81 | do { |
| 82 | *cp++ = c; |
| 83 | c = readch(); |
| 84 | } while (alph(c) || digit(c)); |
| 85 | *cp = 0; |
| 86 | if (opt('s')) |
| 87 | for (cp = token; *cp; cp++) |
| 88 | if (*cp >= 'A' && *cp <= 'Z') { |
| 89 | *cp =| ' '; |
| 90 | } |
| 91 | yysavc = c; |
| 92 | ip = hash(0, 1); |
| 93 | if (*ip < yykey || *ip >= lastkey) { |
| 94 | yylval = *ip; |
| 95 | return (YID); |
| 96 | } |
| 97 | yylval = yyline; |
| 98 | /* |
| 99 | * For keywords |
| 100 | * the lexical token |
| 101 | * is magically retrieved |
| 102 | * from the keyword table. |
| 103 | */ |
| 104 | return ((*ip)[1]); |
| 105 | case '0': case '1': case '2': case '3': case '4': |
| 106 | case '5': case '6': case '7': case '8': case '9': |
| 107 | f = 0; |
| 108 | do { |
| 109 | *cp++ = c; |
| 110 | c = readch(); |
| 111 | } while (digit(c)); |
| 112 | if (c == 'b' || c == 'B') { |
| 113 | /* |
| 114 | * nonstandard - octal constants |
| 115 | */ |
| 116 | if (opt('s')) { |
| 117 | standard(); |
| 118 | yerror("Octal constants are non-standard"); |
| 119 | } |
| 120 | *cp = 0; |
| 121 | yylval = copystr(token); |
| 122 | return (YBINT); |
| 123 | } |
| 124 | if (c == '.') { |
| 125 | c = readch(); |
| 126 | if (c == '.') { |
| 127 | *cp = 0; |
| 128 | yysavc = YDOTDOT; |
| 129 | yylval = copystr(token); |
| 130 | return (YINT); |
| 131 | } |
| 132 | infpnumb: |
| 133 | f++; |
| 134 | *cp++ = '.'; |
| 135 | if (!digit(c)) { |
| 136 | yyset(); |
| 137 | recovered(); |
| 138 | yerror("Digits required after decimal point"); |
| 139 | *cp++ = '0'; |
| 140 | } else |
| 141 | while (digit(c)) { |
| 142 | *cp++ = c; |
| 143 | c = readch(); |
| 144 | } |
| 145 | } |
| 146 | if (c == 'e' || c == 'E') { |
| 147 | f++; |
| 148 | *cp++ = c; |
| 149 | if ((c = yysavc) == 0) |
| 150 | c = readch(); |
| 151 | if (c == '+' || c == '-') { |
| 152 | *cp++ = c; |
| 153 | c = readch(); |
| 154 | } |
| 155 | if (!digit(c)) { |
| 156 | yyset(); |
| 157 | yerror("Digits required in exponent"); |
| 158 | *cp++ = '0'; |
| 159 | } else |
| 160 | while (digit(c)) { |
| 161 | *cp++ = c; |
| 162 | c = readch(); |
| 163 | } |
| 164 | } |
| 165 | *cp = 0; |
| 166 | yysavc = c; |
| 167 | yylval = copystr(token); |
| 168 | if (f) |
| 169 | return (YNUMB); |
| 170 | return (YINT); |
| 171 | case '"': |
| 172 | case '`': |
| 173 | if (!any(bufp + 1, c)) |
| 174 | goto illch; |
| 175 | if (!dquote) { |
| 176 | recovered(); |
| 177 | dquote++; |
| 178 | yerror("Character/string delimiter is '"); |
| 179 | } |
| 180 | case '\'': |
| 181 | case '#': |
| 182 | delim = c; |
| 183 | do { |
| 184 | do { |
| 185 | c = readch(); |
| 186 | if (c == '\n') { |
| 187 | yerror("Unmatched %c for string", delim); |
| 188 | if (cp == token) |
| 189 | *cp++ = ' ', cp++; |
| 190 | break; |
| 191 | } |
| 192 | *cp++ = c; |
| 193 | } while (c != delim); |
| 194 | c = readch(); |
| 195 | } while (c == delim); |
| 196 | *--cp = 0; |
| 197 | if (cp == token) { |
| 198 | yerror("Null string not allowed"); |
| 199 | *cp++ = ' '; |
| 200 | *cp++ = 0; |
| 201 | } |
| 202 | yysavc = c; |
| 203 | yylval = copystr(token); |
| 204 | return (YSTRING); |
| 205 | case '.': |
| 206 | c = readch(); |
| 207 | if (c == '.') |
| 208 | return (YDOTDOT); |
| 209 | if (digit(c)) { |
| 210 | recovered(); |
| 211 | yerror("Digits required before decimal point"); |
| 212 | *cp++ = '0'; |
| 213 | goto infpnumb; |
| 214 | } |
| 215 | yysavc = c; |
| 216 | return ('.'); |
| 217 | case '{': |
| 218 | /* |
| 219 | * { ... } comment |
| 220 | */ |
| 221 | #ifdef PXP |
| 222 | getcm(c); |
| 223 | #endif |
| 224 | #ifdef PI |
| 225 | c = options(); |
| 226 | while (c != '}') { |
| 227 | if (c <= 0) |
| 228 | goto nonterm; |
| 229 | if (c == '{') { |
| 230 | warning(); |
| 231 | yyset(); |
| 232 | yerror("{ in a { ... } comment"); |
| 233 | } |
| 234 | c = readch(); |
| 235 | } |
| 236 | #endif |
| 237 | c = readch(); |
| 238 | goto next; |
| 239 | case '(': |
| 240 | if ((c = readch()) == '*') { |
| 241 | /* |
| 242 | * (* ... *) comment |
| 243 | */ |
| 244 | #ifdef PXP |
| 245 | getcm(c); |
| 246 | c = readch(); |
| 247 | goto next; |
| 248 | #endif |
| 249 | #ifdef PI |
| 250 | c = options(); |
| 251 | for (;;) { |
| 252 | if (c < 0) { |
| 253 | nonterm: |
| 254 | yerror("Comment does not terminate - QUIT"); |
| 255 | pexit(ERRS); |
| 256 | } |
| 257 | if (c == '(' && (c = readch()) == '*') { |
| 258 | warning(); |
| 259 | yyset(); |
| 260 | yerror("(* in a (* ... *) comment"); |
| 261 | } |
| 262 | if (c == '*') { |
| 263 | if ((c = readch()) != ')') |
| 264 | continue; |
| 265 | c = readch(); |
| 266 | goto next; |
| 267 | } |
| 268 | c = readch(); |
| 269 | } |
| 270 | #endif |
| 271 | } |
| 272 | yysavc = c; |
| 273 | c = '('; |
| 274 | case ';': |
| 275 | case ',': |
| 276 | case ':': |
| 277 | case '=': |
| 278 | case '*': |
| 279 | case '+': |
| 280 | case '/': |
| 281 | case '-': |
| 282 | case '|': |
| 283 | case '&': |
| 284 | case ')': |
| 285 | case '[': |
| 286 | case ']': |
| 287 | case '<': |
| 288 | case '>': |
| 289 | case '~': |
| 290 | case '^': |
| 291 | return (c); |
| 292 | default: |
| 293 | switch (c) { |
| 294 | case YDOTDOT: |
| 295 | return (c); |
| 296 | case '\n': |
| 297 | c = readch(); |
| 298 | #ifdef PXP |
| 299 | yytokcnt++; |
| 300 | #endif |
| 301 | goto next; |
| 302 | case '\f': |
| 303 | c = readch(); |
| 304 | goto next; |
| 305 | } |
| 306 | if (c <= 0) |
| 307 | return (YEOF); |
| 308 | illch: |
| 309 | do |
| 310 | yysavc = readch(); |
| 311 | while (yysavc == c); |
| 312 | yylval = c; |
| 313 | return (YILLCH); |
| 314 | } |
| 315 | } |
| 316 | |
| 317 | yyset() |
| 318 | { |
| 319 | |
| 320 | yyecol = yycol; |
| 321 | yyeline = yyline; |
| 322 | yyefile = filename; |
| 323 | yyseekp = yylinpt; |
| 324 | } |
| 325 | |
| 326 | /* |
| 327 | * Setuflg trims the current |
| 328 | * input line to at most 72 chars |
| 329 | * for the u option. |
| 330 | */ |
| 331 | setuflg() |
| 332 | { |
| 333 | |
| 334 | if (charbuf[71] != '\n') { |
| 335 | charbuf[72] = '\n'; |
| 336 | charbuf[73] = 0; |
| 337 | } |
| 338 | } |