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annotate lwcc/lex.c @ 574:a0c9433dc0d4 default tip
Updated submission guidelines including notes about evangelism. TLDR: Don't.
| author | William Astle <lost@l-w.ca> |
|---|---|
| date | Mon, 04 Mar 2024 10:10:38 -0700 |
| parents | ee3e52ab2288 |
| children |
| rev | line source |
|---|---|
| 295 | 1 /* |
| 2 lwcc/lex.c | |
| 3 | |
| 4 Copyright © 2013 William Astle | |
| 5 | |
| 6 This file is part of LWTOOLS. | |
| 7 | |
| 8 LWTOOLS is free software: you can redistribute it and/or modify it under the | |
| 9 terms of the GNU General Public License as published by the Free Software | |
| 10 Foundation, either version 3 of the License, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 16 more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License along with | |
| 19 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 20 */ | |
| 21 | |
| 22 #include <ctype.h> | |
| 23 #include <stdio.h> | |
| 24 | |
| 25 #include <lw_alloc.h> | |
|
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26 #include <lw_strbuf.h> |
| 295 | 27 |
| 28 #include "cpp.h" | |
| 29 #include "token.h" | |
| 30 | |
| 31 /* fetch a raw input byte from the current file. Will return CPP_EOF if | |
| 32 EOF is encountered and CPP_EOL if an end of line sequence is encountered. | |
| 33 End of line is defined as either CR, CRLF, LF, or LFCR. CPP_EOL is | |
| 34 returned on the first CR or LF encountered. The complementary CR or LF | |
| 35 is munched, if present, when the *next* character is read. This always | |
| 36 operates on file_stack. | |
| 37 | |
| 38 This function also accounts for line numbers in input files and also | |
| 39 character columns. | |
| 40 */ | |
| 41 static int fetch_byte_ll(struct preproc_info *pp) | |
| 42 { | |
| 43 int c; | |
| 44 | |
| 45 if (pp -> eolstate != 0) | |
| 46 { | |
| 47 pp -> lineno++; | |
| 48 pp -> column = 0; | |
| 49 } | |
| 50 c = getc(pp -> fp); | |
| 51 pp -> column++; | |
| 52 if (pp -> eolstate == 1) | |
| 53 { | |
| 54 // just saw CR, munch LF | |
| 55 if (c == 10) | |
| 56 c = getc(pp -> fp); | |
| 57 pp -> eolstate = 0; | |
| 58 } | |
| 59 else if (pp -> eolstate == 2) | |
| 60 { | |
| 61 // just saw LF, much CR | |
| 62 if (c == 13) | |
| 63 c = getc(pp -> fp); | |
| 64 pp -> eolstate = 0; | |
| 65 } | |
| 66 | |
| 67 if (c == 10) | |
| 68 { | |
| 69 // we have LF - end of line, flag to munch CR | |
| 70 pp -> eolstate = 2; | |
| 71 c = CPP_EOL; | |
| 72 } | |
| 73 else if (c == 13) | |
| 74 { | |
| 75 // we have CR - end of line, flag to munch LF | |
| 76 pp -> eolstate = 1; | |
| 77 c = CPP_EOL; | |
| 78 } | |
| 79 else if (c == EOF) | |
| 80 { | |
| 81 c = CPP_EOF; | |
| 82 } | |
| 83 return c; | |
| 84 } | |
| 85 | |
| 86 /* This function takes a sequence of bytes from the _ll function above | |
| 87 and does trigraph interpretation on it, but only if the global | |
| 88 trigraphs is nonzero. */ | |
| 89 static int fetch_byte_tg(struct preproc_info *pp) | |
| 90 { | |
| 91 int c; | |
| 92 | |
| 93 if (!pp -> trigraphs) | |
| 94 { | |
| 95 c = fetch_byte_ll(pp); | |
| 96 } | |
| 97 else | |
| 98 { | |
| 99 /* we have to do the trigraph shit here */ | |
| 100 if (pp -> ra != CPP_NOUNG) | |
| 101 { | |
| 102 if (pp -> qseen > 0) | |
| 103 { | |
| 104 c = '?'; | |
| 105 pp -> qseen -= 1; | |
| 106 return c; | |
| 107 } | |
| 108 else | |
| 109 { | |
| 110 c = pp -> ra; | |
| 111 pp -> ra = CPP_NOUNG; | |
| 112 return c; | |
| 113 } | |
| 114 } | |
| 115 | |
| 116 c = fetch_byte_ll(pp); | |
| 117 while (c == '?') | |
| 118 { | |
| 119 pp -> qseen++; | |
| 120 c = fetch_byte_ll(pp); | |
| 121 } | |
| 122 | |
| 123 if (pp -> qseen >= 2) | |
| 124 { | |
| 125 // we have a trigraph | |
| 126 switch (c) | |
| 127 { | |
| 128 case '=': | |
| 129 c = '#'; | |
| 130 pp -> qseen -= 2; | |
| 131 break; | |
| 132 | |
| 133 case '/': | |
| 134 c = '\\'; | |
| 135 pp -> qseen -= 2; | |
| 136 break; | |
| 137 | |
| 138 case '\'': | |
| 139 c = '^'; | |
| 140 pp -> qseen -= 2; | |
| 141 break; | |
| 142 | |
| 143 case '(': | |
| 144 c = '['; | |
| 145 pp -> qseen -= 2; | |
| 146 break; | |
| 147 | |
| 148 case ')': | |
| 149 c = ']'; | |
| 150 pp -> qseen -= 2; | |
| 151 break; | |
| 152 | |
| 153 case '!': | |
| 154 c = '|'; | |
| 155 pp -> qseen -= 2; | |
| 156 break; | |
| 157 | |
| 158 case '<': | |
| 159 c = '{'; | |
| 160 pp -> qseen -= 2; | |
| 161 break; | |
| 162 | |
| 163 case '>': | |
| 164 c = '}'; | |
| 165 pp -> qseen -= 2; | |
| 166 break; | |
| 167 | |
| 168 case '-': | |
| 169 c = '~'; | |
| 170 pp -> qseen -= 2; | |
| 171 break; | |
| 172 } | |
| 173 if (pp -> qseen > 0) | |
| 174 { | |
| 175 pp -> ra = c; | |
| 176 c = '?'; | |
| 177 pp -> qseen--; | |
| 178 } | |
| 179 } | |
| 180 else if (pp -> qseen > 0) | |
| 181 { | |
| 182 pp -> ra = c; | |
| 183 c = '?'; | |
| 184 pp -> qseen--; | |
| 185 } | |
| 186 } | |
| 187 return c; | |
| 188 } | |
| 189 | |
| 190 /* This function puts a byte back onto the front of the input stream used | |
| 191 by fetch_byte(). Theoretically, an unlimited number of characters can | |
| 192 be unfetched. Line and column counting may be incorrect if unfetched | |
| 193 characters cross a token boundary. */ | |
|
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194 void preproc_lex_unfetch_byte(struct preproc_info *pp, int c) |
| 295 | 195 { |
|
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196 if (pp -> lexstr) |
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197 { |
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198 if (c == CPP_EOL) |
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199 return; |
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200 if (pp -> lexstrloc > 0) |
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201 { |
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202 pp -> lexstrloc--; |
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203 return; |
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204 } |
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205 } |
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206 |
| 295 | 207 if (pp -> ungetbufl >= pp -> ungetbufs) |
| 208 { | |
| 209 pp -> ungetbufs += 100; | |
| 210 pp -> ungetbuf = lw_realloc(pp -> ungetbuf, pp -> ungetbufs); | |
| 211 } | |
| 212 pp -> ungetbuf[pp -> ungetbufl++] = c; | |
| 213 } | |
| 214 | |
| 215 /* This function retrieves a byte from the input stream. It performs | |
| 216 backslash-newline splicing on the returned bytes. Any character | |
| 217 retrieved from the unfetch buffer is presumed to have already passed | |
| 218 the backslash-newline filter. */ | |
| 219 static int fetch_byte(struct preproc_info *pp) | |
| 220 { | |
| 221 int c; | |
| 222 | |
|
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223 if (pp -> lexstr) |
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224 { |
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225 if (pp -> lexstr[pp -> lexstrloc]) |
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226 return pp -> lexstr[pp -> lexstrloc++]; |
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227 else |
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228 return CPP_EOL; |
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229 } |
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230 |
| 295 | 231 if (pp -> ungetbufl > 0) |
| 232 { | |
| 233 pp -> ungetbufl--; | |
| 234 c = pp -> ungetbuf[pp -> ungetbufl]; | |
| 235 if (pp -> ungetbufl == 0) | |
| 236 { | |
| 237 lw_free(pp -> ungetbuf); | |
| 238 pp -> ungetbuf = NULL; | |
| 239 pp -> ungetbufs = 0; | |
| 240 } | |
| 241 return c; | |
| 242 } | |
| 243 | |
| 244 again: | |
| 245 if (pp -> unget != CPP_NOUNG) | |
| 246 { | |
| 247 c = pp -> unget; | |
| 248 pp -> unget = CPP_NOUNG; | |
| 249 } | |
| 250 else | |
| 251 { | |
| 252 c = fetch_byte_tg(pp); | |
| 253 } | |
| 254 if (c == '\\') | |
| 255 { | |
| 256 int c2; | |
| 257 c2 = fetch_byte_tg(pp); | |
| 258 if (c2 == CPP_EOL) | |
| 259 goto again; | |
| 260 else | |
| 261 pp -> unget = c2; | |
| 262 } | |
| 263 return c; | |
| 264 } | |
| 265 | |
| 266 | |
| 267 | |
| 268 /* | |
| 269 Lex a token off the current input file. | |
| 270 | |
| 271 Returned tokens are as follows: | |
| 272 | |
| 273 * all words starting with [a-zA-Z_] are returned as TOK_IDENT | |
| 274 * numbers are returned as their appropriate type | |
| 275 * all whitespace in a sequence, including comments, is returned as | |
| 276 a single instance of TOK_WSPACE | |
| 277 * TOK_EOL is returned in the case of the end of a line | |
| 278 * TOK_EOF is returned when the end of the file is reached | |
| 279 * If no TOK_EOL appears before TOK_EOF, a TOK_EOL will be synthesised | |
| 280 * Any symbolic operator, etc., recognized by C will be returned as such | |
| 281 a token | |
| 282 * TOK_HASH will be returned for a # | |
| 283 * trigraphs will be interpreted | |
| 284 * backslash-newline will be interpreted | |
| 285 * any instance of CR, LF, CRLF, or LFCR will be interpreted as TOK_EOL | |
| 286 */ | |
| 287 | |
| 288 | |
|
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289 int preproc_lex_fetch_byte(struct preproc_info *pp) |
| 295 | 290 { |
| 291 int c; | |
| 292 c = fetch_byte(pp); | |
| 293 if (c == CPP_EOF && pp -> eolseen == 0) | |
| 294 { | |
| 295 preproc_throw_warning(pp, "No newline at end of file"); | |
| 296 pp -> eolseen = 1; | |
| 297 return CPP_EOL; | |
| 298 } | |
| 299 | |
| 300 if (c == CPP_EOL) | |
| 301 { | |
| 302 pp -> eolseen = 1; | |
| 303 return c; | |
| 304 } | |
| 300 | 305 |
| 295 | 306 pp -> eolseen = 0; |
| 307 | |
| 308 /* convert comments to a single space here */ | |
| 309 if (c == '/') | |
| 310 { | |
| 311 int c2; | |
| 312 c2 = fetch_byte(pp); | |
| 313 if (c2 == '/') | |
| 314 { | |
| 315 /* single line comment */ | |
| 316 c = ' '; | |
| 317 for (;;) | |
| 318 { | |
| 319 c2 = fetch_byte(pp); | |
| 320 if (c2 == CPP_EOF || c2 == CPP_EOL) | |
| 321 break; | |
| 322 } | |
| 323 preproc_lex_unfetch_byte(pp, c2); | |
| 324 } | |
| 325 else if (c2 == '*') | |
| 326 { | |
| 327 /* block comment */ | |
| 328 c = ' '; | |
| 329 for (;;) | |
| 330 { | |
| 331 c2 = fetch_byte(pp); | |
|
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332 if (c2 == CPP_EOF) |
| 295 | 333 { |
| 334 preproc_lex_unfetch_byte(pp, c); | |
| 335 break; | |
| 336 } | |
| 337 if (c2 == '*') | |
| 338 { | |
| 339 /* maybe end of comment */ | |
| 340 c2 = preproc_lex_fetch_byte(pp); | |
| 341 if (c2 == '/') | |
| 342 break; | |
| 343 } | |
| 344 } | |
| 345 } | |
| 346 else | |
| 347 { | |
| 348 /* not a comment - restore lookahead character */ | |
| 349 preproc_lex_unfetch_byte(pp, c2); | |
| 350 } | |
| 351 } | |
| 352 return c; | |
| 353 } | |
| 354 | |
| 355 struct token *preproc_lex_next_token(struct preproc_info *pp) | |
| 356 { | |
| 357 int sline = pp -> lineno; | |
| 358 int scol = pp -> column; | |
| 359 char *strval = NULL; | |
| 360 int ttype = TOK_NONE; | |
| 361 int c, c2; | |
| 362 int cl; | |
|
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363 struct lw_strbuf *strbuf; |
|
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364 struct token *t = NULL; |
| 300 | 365 struct preproc_info *fs; |
| 366 | |
| 367 fileagain: | |
| 295 | 368 c = preproc_lex_fetch_byte(pp); |
| 369 if (c == CPP_EOF) | |
| 370 { | |
| 371 if (pp -> nlseen == 0) | |
| 372 { | |
| 373 c = CPP_EOL; | |
| 374 } | |
| 375 } | |
|
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376 |
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377 if (pp -> lineno != sline) |
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378 { |
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379 sline = pp -> lineno; |
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380 scol = pp -> column; |
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381 } |
| 295 | 382 |
| 383 if (c == CPP_EOF) | |
| 384 { | |
| 300 | 385 /* check if we fell off the end of an include file */ |
| 386 if (pp -> filestack) | |
| 387 { | |
| 388 if (pp -> skip_level || pp -> found_level) | |
| 389 { | |
| 390 preproc_throw_error(pp, "Unbalanced conditionals in include file"); | |
| 391 } | |
| 392 fclose(pp -> fp); | |
| 393 fs = pp -> filestack; | |
| 394 *pp = *fs; | |
| 395 pp -> filestack = fs -> n; | |
| 396 goto fileagain; | |
| 397 } | |
| 398 else | |
| 399 { | |
| 400 ttype = TOK_EOF; | |
| 401 goto out; | |
| 402 } | |
| 295 | 403 } |
| 404 if (c == CPP_EOL) | |
| 405 { | |
| 406 pp -> nlseen = 1; | |
| 407 ttype = TOK_EOL; | |
| 408 goto out; | |
| 409 } | |
| 410 | |
| 411 pp -> nlseen = 0; | |
| 412 if (isspace(c)) | |
| 413 { | |
| 414 while (isspace(c)) | |
| 415 c = preproc_lex_fetch_byte(pp); | |
| 416 preproc_lex_unfetch_byte(pp, c); | |
| 417 ttype = TOK_WSPACE; | |
| 418 goto out; | |
| 419 } | |
| 420 | |
| 421 switch (c) | |
| 422 { | |
| 423 case '?': | |
| 424 ttype = TOK_QMARK; | |
| 425 goto out; | |
| 426 | |
| 427 case ':': | |
| 428 ttype = TOK_COLON; | |
| 429 goto out; | |
| 430 | |
| 431 case ',': | |
| 432 ttype = TOK_COMMA; | |
| 433 goto out; | |
| 434 | |
| 435 case '(': | |
| 436 ttype = TOK_OPAREN; | |
| 437 goto out; | |
| 438 | |
| 439 case ')': | |
| 440 ttype = TOK_CPAREN; | |
| 441 goto out; | |
| 442 | |
| 443 case '{': | |
| 444 ttype = TOK_OBRACE; | |
| 445 goto out; | |
| 446 | |
| 447 case '}': | |
| 448 ttype = TOK_CBRACE; | |
| 449 goto out; | |
| 450 | |
| 451 case '[': | |
| 452 ttype = TOK_OSQUARE; | |
| 453 goto out; | |
| 454 | |
| 455 case ']': | |
| 456 ttype = TOK_CSQUARE; | |
| 457 goto out; | |
| 458 | |
| 459 case '~': | |
| 460 ttype = TOK_COM; | |
| 461 goto out; | |
| 462 | |
| 463 case ';': | |
| 464 ttype = TOK_EOS; | |
| 465 goto out; | |
| 466 | |
| 467 /* and now for the possible multi character tokens */ | |
| 468 case '#': | |
| 469 ttype = TOK_HASH; | |
| 470 c = preproc_lex_fetch_byte(pp); | |
| 471 if (c == '#') | |
| 472 ttype = TOK_DBLHASH; | |
| 473 else | |
| 474 preproc_lex_unfetch_byte(pp, c); | |
| 475 goto out; | |
| 476 | |
| 477 case '^': | |
| 478 ttype = TOK_XOR; | |
| 479 c = preproc_lex_fetch_byte(pp); | |
| 480 if (c == '=') | |
| 481 ttype = TOK_XORASS; | |
| 482 else | |
| 483 preproc_lex_unfetch_byte(pp, c); | |
| 484 goto out; | |
| 485 | |
| 486 case '!': | |
| 487 ttype = TOK_BNOT; | |
| 488 c = preproc_lex_fetch_byte(pp); | |
| 489 if (c == '=') | |
| 490 ttype = TOK_NE; | |
| 491 else | |
| 492 preproc_lex_unfetch_byte(pp, c); | |
| 493 goto out; | |
| 494 | |
| 495 case '*': | |
| 496 ttype = TOK_STAR; | |
| 497 c = preproc_lex_fetch_byte(pp); | |
| 498 if (c == '=') | |
| 499 ttype = TOK_MULASS; | |
| 500 else | |
| 501 preproc_lex_unfetch_byte(pp, c); | |
| 502 goto out; | |
| 503 | |
| 504 case '/': | |
| 505 ttype = TOK_DIV; | |
| 506 c = preproc_lex_fetch_byte(pp); | |
| 507 if (c == '=') | |
| 508 ttype = TOK_DIVASS; | |
| 509 else | |
| 510 preproc_lex_unfetch_byte(pp, c); | |
| 511 goto out; | |
| 512 | |
| 513 case '=': | |
| 514 ttype = TOK_ASS; | |
| 515 c = preproc_lex_fetch_byte(pp); | |
| 516 if (c == '=') | |
| 517 ttype = TOK_EQ; | |
| 518 else | |
| 519 preproc_lex_unfetch_byte(pp, c); | |
| 520 goto out; | |
| 521 | |
| 522 case '%': | |
| 523 ttype = TOK_MOD; | |
| 524 c = preproc_lex_fetch_byte(pp); | |
| 525 if (c == '=') | |
| 526 ttype = TOK_MODASS; | |
| 527 else | |
| 528 preproc_lex_unfetch_byte(pp, c); | |
| 529 goto out; | |
| 530 | |
| 531 case '-': | |
| 532 ttype = TOK_SUB; | |
| 533 c = preproc_lex_fetch_byte(pp); | |
| 534 if (c == '=') | |
| 535 ttype = TOK_SUBASS; | |
| 536 else if (c == '-') | |
| 537 ttype = TOK_DBLSUB; | |
| 538 else if (c == '>') | |
| 539 ttype = TOK_ARROW; | |
| 540 else | |
| 541 preproc_lex_unfetch_byte(pp, c); | |
| 542 goto out; | |
| 543 | |
| 544 case '+': | |
| 545 ttype = TOK_ADD; | |
| 546 c = preproc_lex_fetch_byte(pp); | |
| 547 if (c == '=') | |
| 548 ttype = TOK_ADDASS; | |
| 549 else if (c == '+') | |
| 550 ttype = TOK_DBLADD; | |
| 551 else | |
| 552 preproc_lex_unfetch_byte(pp, c); | |
| 553 goto out; | |
| 554 | |
| 555 | |
| 556 case '&': | |
| 557 ttype = TOK_BWAND; | |
| 558 c = preproc_lex_fetch_byte(pp); | |
| 559 if (c == '=') | |
| 560 ttype = TOK_BWANDASS; | |
| 561 else if (c == '&') | |
| 562 ttype = TOK_BAND; | |
| 563 else | |
| 564 preproc_lex_unfetch_byte(pp, c); | |
| 565 goto out; | |
| 566 | |
| 567 case '|': | |
| 568 ttype = TOK_BWOR; | |
| 569 c = preproc_lex_fetch_byte(pp); | |
| 570 if (c == '=') | |
| 571 ttype = TOK_BWORASS; | |
| 572 else if (c == '|') | |
| 573 ttype = TOK_BOR; | |
| 574 else | |
| 575 preproc_lex_unfetch_byte(pp, c); | |
| 576 goto out; | |
| 577 | |
| 578 case '<': | |
| 579 ttype = TOK_LT; | |
| 580 c = preproc_lex_fetch_byte(pp); | |
| 581 if (c == '=') | |
| 582 ttype = TOK_LE; | |
| 583 else if (c == '<') | |
| 584 { | |
| 585 ttype = TOK_LSH; | |
| 586 c = preproc_lex_fetch_byte(pp); | |
| 587 if (c == '=') | |
| 588 ttype = TOK_LSHASS; | |
| 589 else | |
| 590 preproc_lex_unfetch_byte(pp, c); | |
| 591 } | |
| 592 else | |
| 593 preproc_lex_unfetch_byte(pp, c); | |
| 594 goto out; | |
| 595 | |
| 596 | |
| 597 case '>': | |
| 598 ttype = TOK_GT; | |
| 599 c = preproc_lex_fetch_byte(pp); | |
| 600 if (c == '=') | |
| 601 ttype = TOK_GE; | |
| 602 else if (c == '>') | |
| 603 { | |
| 604 ttype = TOK_RSH; | |
| 605 c = preproc_lex_fetch_byte(pp); | |
| 606 if (c == '=') | |
| 607 ttype = TOK_RSHASS; | |
| 608 else | |
| 609 preproc_lex_unfetch_byte(pp, c); | |
| 610 } | |
| 611 else | |
| 612 preproc_lex_unfetch_byte(pp, c); | |
| 613 goto out; | |
| 614 | |
| 615 case '\'': | |
| 616 /* character constant - turns into a uint */ | |
| 617 chrlit: | |
| 618 cl = 0; | |
|
308
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|
619 strbuf = lw_strbuf_new(); |
| 295 | 620 for (;;) |
| 621 { | |
| 622 c = preproc_lex_fetch_byte(pp); | |
| 623 if (c == CPP_EOF || c == CPP_EOL || c == '\'') | |
| 624 break; | |
| 625 cl++; | |
| 626 if (c == '\\') | |
| 627 { | |
|
308
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|
628 lw_strbuf_add(strbuf, '\\'); |
| 295 | 629 c = preproc_lex_fetch_byte(pp); |
| 630 if (c == CPP_EOF || c == CPP_EOL) | |
| 631 { | |
|
298
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296
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|
632 if (!pp -> lexstr) |
|
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diff
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|
633 preproc_throw_error(pp, "Invalid character constant"); |
|
299
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|
634 ttype = TOK_ERROR; |
|
308
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|
635 strval = lw_strbuf_end(strbuf); |
|
299
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|
636 goto out; |
| 295 | 637 } |
| 638 cl++; | |
|
308
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|
639 lw_strbuf_add(strbuf, c); |
| 295 | 640 continue; |
| 641 } | |
|
308
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diff
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|
642 lw_strbuf_add(strbuf, c); |
| 295 | 643 } |
|
308
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|
644 strval = lw_strbuf_end(strbuf); |
|
299
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diff
changeset
|
645 if (cl == 0) |
|
856caf91ffaa
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298
diff
changeset
|
646 { |
|
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|
647 ttype = TOK_ERROR; |
|
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Added token list structure and switched some stuff to use it
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298
diff
changeset
|
648 if (!pp -> lexstr) |
|
856caf91ffaa
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298
diff
changeset
|
649 preproc_throw_error(pp, "Invalid character constant"); |
|
856caf91ffaa
Added token list structure and switched some stuff to use it
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298
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changeset
|
650 } |
|
856caf91ffaa
Added token list structure and switched some stuff to use it
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parents:
298
diff
changeset
|
651 else |
|
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
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298
diff
changeset
|
652 ttype = TOK_CHR_LIT; |
| 295 | 653 goto out; |
| 654 | |
| 655 case '"': | |
| 656 strlit: | |
| 657 /* string literal */ | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
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306
diff
changeset
|
658 strbuf = lw_strbuf_new(); |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
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306
diff
changeset
|
659 lw_strbuf_add(strbuf, '"'); |
| 295 | 660 for (;;) |
| 661 { | |
| 662 c = preproc_lex_fetch_byte(pp); | |
|
299
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
parents:
298
diff
changeset
|
663 if (c == CPP_EOF || c == CPP_EOL) |
|
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
parents:
298
diff
changeset
|
664 { |
|
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
parents:
298
diff
changeset
|
665 ttype = TOK_ERROR; |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
666 strval = lw_strbuf_end(strbuf); |
|
299
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
parents:
298
diff
changeset
|
667 if (!pp -> lexstr) |
|
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
parents:
298
diff
changeset
|
668 preproc_throw_error(pp, "Invalid string constant"); |
|
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
parents:
298
diff
changeset
|
669 goto out; |
|
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
parents:
298
diff
changeset
|
670 } |
|
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
parents:
298
diff
changeset
|
671 if (c == '"') |
| 295 | 672 break; |
| 673 if (c == '\\') | |
| 674 { | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
675 lw_strbuf_add(strbuf, '\\'); |
| 295 | 676 c = preproc_lex_fetch_byte(pp); |
| 677 if (c == CPP_EOF || c == CPP_EOL) | |
| 678 { | |
|
299
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
parents:
298
diff
changeset
|
679 ttype = TOK_ERROR; |
|
298
6112c67728ba
Add stringification and token concatenation
William Astle <lost@l-w.ca>
parents:
296
diff
changeset
|
680 if (!pp -> lexstr) |
|
6112c67728ba
Add stringification and token concatenation
William Astle <lost@l-w.ca>
parents:
296
diff
changeset
|
681 preproc_throw_error(pp, "Invalid string constant"); |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
682 strval = lw_strbuf_end(strbuf); |
|
299
856caf91ffaa
Added token list structure and switched some stuff to use it
William Astle <lost@l-w.ca>
parents:
298
diff
changeset
|
683 goto out; |
| 295 | 684 } |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
685 lw_strbuf_add(strbuf, c); |
| 295 | 686 continue; |
| 687 } | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
688 lw_strbuf_add(strbuf, c); |
| 295 | 689 } |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
690 lw_strbuf_add(strbuf, '"'); |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
691 strval = lw_strbuf_end(strbuf); |
| 295 | 692 ttype = TOK_STR_LIT; |
| 693 goto out; | |
| 694 | |
| 695 case 'L': | |
| 696 /* check for wide string or wide char const */ | |
| 697 c2 = preproc_lex_fetch_byte(pp); | |
| 698 if (c2 == '\'') | |
| 699 { | |
| 700 goto chrlit; | |
| 701 } | |
| 702 else if (c2 == '"') | |
| 703 { | |
| 704 goto strlit; | |
| 705 } | |
| 706 preproc_lex_unfetch_byte(pp, c2); | |
| 707 /* fall through for identifier */ | |
| 708 case '_': | |
| 709 case 'a': case 'b': case 'c': case 'd': case 'e': case 'f': | |
| 710 case 'g': case 'h': case 'i': case 'j': case 'k': case 'l': | |
| 711 case 'm': case 'n': case 'o': case 'p': case 'q': case 'r': | |
| 712 case 's': case 't': case 'u': case 'v': case 'w': case 'x': | |
| 713 case 'y': case 'z': | |
| 714 case 'A': case 'B': case 'C': case 'D': case 'E': case 'F': | |
| 715 case 'G': case 'H': case 'I': case 'J': case 'K': | |
| 716 case 'M': case 'N': case 'O': case 'P': case 'Q': case 'R': | |
| 717 case 'S': case 'T': case 'U': case 'V': case 'W': case 'X': | |
| 718 case 'Y': case 'Z': | |
| 719 /* we have an identifier here */ | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
720 strbuf = lw_strbuf_new(); |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
721 lw_strbuf_add(strbuf, c); |
| 295 | 722 for (;;) |
| 723 { | |
| 724 c = preproc_lex_fetch_byte(pp); | |
| 725 if ((c == '_') || (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) | |
| 726 { | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
727 lw_strbuf_add(strbuf, c); |
| 295 | 728 continue; |
| 729 } | |
| 730 else | |
| 731 { | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
732 lw_strbuf_add(strbuf, 0); |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
733 strval = lw_strbuf_end(strbuf); |
| 295 | 734 break; |
| 735 } | |
| 736 } | |
| 737 preproc_lex_unfetch_byte(pp, c); | |
| 738 ttype = TOK_IDENT; | |
| 739 goto out; | |
| 740 | |
| 741 case '.': | |
| 742 c = preproc_lex_fetch_byte(pp); | |
| 743 if (c >= '0' && c <= '9') | |
| 744 { | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
745 strbuf = lw_strbuf_new(); |
|
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
746 lw_strbuf_add(strbuf, '.'); |
| 295 | 747 goto numlit; |
| 748 } | |
| 749 else if (c == '.') | |
| 750 { | |
| 751 c = preproc_lex_fetch_byte(pp); | |
| 752 if (c == '.') | |
| 753 { | |
| 754 ttype = TOK_ELLIPSIS; | |
| 755 goto out; | |
| 756 } | |
| 757 preproc_lex_unfetch_byte(pp, c); | |
| 758 } | |
| 759 preproc_lex_unfetch_byte(pp, c); | |
| 760 ttype = TOK_DOT; | |
| 761 goto out; | |
| 762 | |
| 763 case '0': case '1': case '2': case '3': case '4': | |
| 764 case '5': case '6': case '7': case '8': case '9': | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
765 strbuf = lw_strbuf_new(); |
| 295 | 766 numlit: |
| 296 | 767 ttype = TOK_NUMBER; |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
768 lw_strbuf_add(strbuf, c); |
| 295 | 769 for (;;) |
| 770 { | |
| 771 c = preproc_lex_fetch_byte(pp); | |
| 772 if (!((c == '_') || (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z'))) | |
| 773 break; | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
774 lw_strbuf_add(strbuf, c); |
| 295 | 775 if (c == 'e' || c == 'E' || c == 'p' || c == 'P') |
| 776 { | |
| 777 c = preproc_lex_fetch_byte(pp); | |
| 778 if (c == '+' || c == '-') | |
| 779 { | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
780 lw_strbuf_add(strbuf, c); |
| 295 | 781 continue; |
| 782 } | |
| 783 preproc_lex_unfetch_byte(pp, c); | |
| 784 } | |
| 785 } | |
|
308
670ea8f90212
Converted preproc logic to library and moved some utility stuff to lwlib
William Astle <lost@l-w.ca>
parents:
306
diff
changeset
|
786 strval = lw_strbuf_end(strbuf); |
| 295 | 787 preproc_lex_unfetch_byte(pp, c); |
| 788 goto out; | |
| 789 | |
| 790 default: | |
| 791 ttype = TOK_CHAR; | |
| 792 strval = lw_alloc(2); | |
| 793 strval[0] = c; | |
| 794 strval[1] = 0; | |
| 795 break; | |
| 796 } | |
| 797 out: | |
| 798 t = token_create(ttype, strval, sline, scol, pp -> fn); | |
| 799 lw_free(strval); | |
| 800 return t; | |
| 801 } |