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GeezerVison is showing github.com — livecode/lcidlc/src/Scanner.cpp at develop · livecode/livecode
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Expand file tree/ Copy pathScanner.cppMore file actions 548 lines (448 loc) · 12.6 KB / Copy pathScanner.cppFile metadata and controls548 lines (448 loc) · 12.6 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 /* Copyright (C) 2003-2015 LiveCode Ltd. This file is part of LiveCode. LiveCode is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License v3 as published by the Free Software Foundation. LiveCode is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with LiveCode. If not see <http://www.gnu.org/licenses/>. */ #include <stdio.h> #include "foundation.h" #include "Error.h" #include "Scanner.h" //////////////////////////////////////////////////////////////////////////////// struct Scanner { char *input_buffer; uint32_t input_frontier; uint32_t input_limit; uint32_t input_row; uint32_t input_column; Token *token_buffer; uint32_t token_pointer; uint32_t token_mark; uint32_t token_frontier; uint32_t token_capacity; }; //////////////////////////////////////////////////////////////////////////////// static bool ScannerIsEndPrefix(ScannerRef self) { return self -> input_frontier == self -> input_limit; } static bool ScannerIsWhitespacePrefix(ScannerRef self) { return self -> input_buffer[self -> input_frontier] == ' ' || self -> input_buffer[self -> input_frontier] == '\t'; } static bool ScannerIsNewlinePrefix(ScannerRef self) { return self -> input_buffer[self -> input_frontier] == 10 || self -> input_buffer[self -> input_frontier] == 13; } static bool ScannerIsCommentPrefix(ScannerRef self) { if (self -> input_buffer[self -> input_frontier] == '#') return true; if (self -> input_limit - self -> input_frontier <= 1) return false; if (self -> input_buffer[self -> input_frontier] == '/' && self -> input_buffer[self -> input_frontier + 1] == '/') return true; if (self -> input_buffer[self -> input_frontier] == '-' && self -> input_buffer[self -> input_frontier + 1] == '-') return true; return false; } static bool ScannerIsMultilineCommentPrefix(ScannerRef self) { if (self -> input_buffer[self -> input_frontier] == '/' && self -> input_buffer[self -> input_frontier + 1] == '*') return true; return false; } // MW-2013-06-14: [[ ExternalsApiV5 ]] Add support for /* ... */ style multi-line comments. static bool ScannerIsMultilineCommentSuffix(ScannerRef self) { if (self -> input_buffer[self -> input_frontier] == '*' && self -> input_buffer[self -> input_frontier + 1] == '/') return true; return false; } static bool ScannerIsIdentifierPrefix(ScannerRef self) { char t_lookahead; t_lookahead = self -> input_buffer[self -> input_frontier]; if ((t_lookahead >= 'a' && t_lookahead <= 'z') || (t_lookahead >= 'A' && t_lookahead <= 'Z') || t_lookahead == '_') return true; return false; } static bool ScannerIsIdentifierSuffix(ScannerRef self) { char t_lookahead; t_lookahead = self -> input_buffer[self -> input_frontier]; if ((t_lookahead >= 'a' && t_lookahead <= 'z') || (t_lookahead >= 'A' && t_lookahead <= 'Z') || (t_lookahead >= '0' && t_lookahead <= '9') || t_lookahead == '_' || t_lookahead == '-' || t_lookahead == '+' || t_lookahead == '.') return true; return false; } static bool ScannerIsNumberPrefix(ScannerRef self) { char t_lookahead; t_lookahead = self -> input_buffer[self -> input_frontier]; // MERG-2013-06-14: [[ ExternalsApiV5 ]] Allow negative integer constants. if ((t_lookahead >= '0' && t_lookahead <= '9') || t_lookahead == '-') return true; return false; } static bool ScannerIsIntegerSuffix(ScannerRef self) { char t_lookahead; t_lookahead = self -> input_buffer[self -> input_frontier]; if ((t_lookahead >= '0' && t_lookahead <= '9')) return true; return false; } static bool ScannerIsDecimalPrefix(ScannerRef self) { if (self -> input_buffer[self -> input_frontier] == '.') return true; return false; } static bool ScannerIsStringPrefix(ScannerRef self) { if (self -> input_buffer[self -> input_frontier] == '"') return true; return false; } static bool ScannerIsComma(ScannerRef self) { return self -> input_buffer[self -> input_frontier] == ','; } static void ScannerSkipNewline(ScannerRef self) { char t_lookahead; t_lookahead = self -> input_buffer[self -> input_frontier]; if (t_lookahead == 10) { self -> input_column = 0; self -> input_row += 1; self -> input_frontier += 1; } else if (t_lookahead == 13) { if (self -> input_limit - self -> input_frontier > 1 && self -> input_buffer[self -> input_frontier + 1] == 10) self -> input_frontier += 1; self -> input_column = 0; self -> input_row += 1; self -> input_frontier += 1; } } static void ScannerSkipComment(ScannerRef self) { while(!ScannerIsEndPrefix(self)) { if (ScannerIsNewlinePrefix(self)) { ScannerSkipNewline(self); break; } self -> input_frontier += 1; self -> input_column += 1; } } // MW-2013-06-14: [[ ExternalsApiV5 ]] Add support for /* ... */ style multi-line comments. static void ScannerSkipMultilineComment(ScannerRef self) { while(!ScannerIsEndPrefix(self)) { if (ScannerIsNewlinePrefix(self)) { ScannerSkipNewline(self); } else if (ScannerIsMultilineCommentSuffix(self)) { self -> input_frontier += 2; self -> input_column += 2; break; } else { self->input_frontier += 1; self->input_column += 1; } } } // MW-2013-06-14: [[ ExternalsApiV5 ]] Add support for /* ... */ style multi-line comments. static void ScannerSkipWhitespace(ScannerRef self) { while(!ScannerIsEndPrefix(self)) { if (ScannerIsWhitespacePrefix(self)) { self -> input_column += 1; self -> input_frontier += 1; } else if (ScannerIsNewlinePrefix(self)) ScannerSkipNewline(self); else if (ScannerIsCommentPrefix(self)) ScannerSkipComment(self); else if (ScannerIsMultilineCommentPrefix(self)) ScannerSkipMultilineComment(self); else break; } } static bool ScannerEnsureToken(ScannerRef self) { if (self -> token_frontier == self -> token_capacity) { if (self -> token_mark != 0) { for(uint32_t i = 0; i < self -> token_mark; i++) ValueRelease(self -> token_buffer[i] . value); for(uint32_t i = self -> token_mark; i < self -> token_frontier; i++) self -> token_buffer[i - self -> token_mark] = self -> token_buffer[i]; self -> token_pointer -= self -> token_mark; self -> token_frontier -= self -> token_mark; self -> token_mark = 0; } else { if (!MCMemoryResizeArray(self -> token_capacity == 0 ? 16 : self -> token_capacity * 2, self -> token_buffer, self -> token_capacity)) return false; } } return true; } static bool ScannerConsume(ScannerRef self) { TokenType t_type; uint32_t t_row; uint32_t t_first_column; uint32_t t_start; ValueRef t_value; ScannerSkipWhitespace(self); t_type = kTokenTypeNone; t_row = self -> input_row; t_first_column = self -> input_column; t_start = self -> input_frontier; t_value = nil; bool t_success; t_success = true; if (ScannerIsEndPrefix(self)) t_type = kTokenTypeEnd; else if (ScannerIsIdentifierPrefix(self)) { t_type = kTokenTypeIdentifier; while(!ScannerIsEndPrefix(self)) { if (!ScannerIsIdentifierSuffix(self)) break; self -> input_frontier += 1; self -> input_column += 1; } t_success = NameCreateWithNativeChars(self -> input_buffer + t_start, self -> input_frontier - t_start, t_value); } else if (ScannerIsNumberPrefix(self)) { t_type = kTokenTypeNumber; // MW-2013-06-17: [[ ExternalsApiV5 ]] Since number-prefix is not a subset of // number-suffix (due to '-'), make sure we advance past the prefix before // continuing the scan. self -> input_frontier += 1; self -> input_column += 1; while(!ScannerIsEndPrefix(self) && ScannerIsIntegerSuffix(self)) { self -> input_frontier += 1; self -> input_column += 1; } if (!ScannerIsEndPrefix(self) && ScannerIsDecimalPrefix(self)) { self -> input_frontier += 1; self -> input_column += 1; while(!ScannerIsEndPrefix(self) && ScannerIsIntegerSuffix(self)) { self -> input_frontier += 1; self -> input_column += 1; } } t_success = NumberCreateWithNativeChars(self -> input_buffer + t_start, self -> input_frontier - t_start, t_value); } else if (ScannerIsStringPrefix(self)) { self -> input_frontier += 1; self -> input_column += 1; do { if (ScannerIsEndPrefix(self)) { t_type = kTokenTypeUnterminatedStringError; break; } if (ScannerIsNewlinePrefix(self)) { t_type = kTokenTypeNewlineInStringError; break; } if (ScannerIsStringPrefix(self)) t_type = kTokenTypeString; self -> input_frontier += 1; self -> input_column += 1; } while(t_type == kTokenTypeNone); t_success = StringCreateWithNativeChars(self -> input_buffer + t_start + 1, self -> input_frontier - t_start - 2, t_value); } else if (ScannerIsComma(self)) { self -> input_frontier += 1; self -> input_column += 1; t_type = kTokenTypeComma; } else { t_type = kTokenTypeInvalidCharError; self -> input_frontier += 1; self -> input_column += 1; } if (t_success) t_success = ScannerEnsureToken(self); if (t_success) { self -> token_buffer[self -> token_frontier] . type = t_type; self -> token_buffer[self -> token_frontier] . start = PositionMake(t_row, t_first_column); self -> token_buffer[self -> token_frontier] . finish = PositionMake(t_row, t_first_column + (self -> input_frontier - t_start)); self -> token_buffer[self -> token_frontier] . value = t_value; self -> token_frontier += 1; } else ValueRelease(t_value); return t_success; } //////////////////////////////////////////////////////////////////////////////// static bool TextFileFetch(const char *p_filename, char*& r_data, uint32_t& r_data_size) { bool t_success; t_success = true; FILE *t_stream; t_stream = nil; if (t_success) { t_stream = fopen(p_filename, "rb"); if (t_stream == nil) t_success = Throw(kErrorCouldNotOpenFile); } uint32_t t_file_size; t_file_size = 0; if (t_success) t_success = fseek(t_stream, 0, SEEK_END) == 0; if (t_success) { long t_size; t_size = ftell(t_stream); t_file_size = (uint32_t) t_size; t_success = (t_size >= 0); } if (t_success) t_success = fseek(t_stream, 0, SEEK_SET) == 0; char *t_file_data; t_file_data = nil; if (t_success) t_success = MCMemoryNewArray(t_file_size, t_file_data); if (t_success) { if (fread(t_file_data, t_file_size, 1, t_stream) != 1) t_success = Throw(kErrorCouldNotReadFile); } if (t_success) { r_data = t_file_data; r_data_size = t_file_size; } else MCMemoryDeleteArray(t_file_data); if (t_stream != nil) fclose(t_stream); return t_success; } bool ScannerCreate(const char *p_filename, ScannerRef& r_scanner) { bool t_success; t_success = true; ScannerRef self; self = nil; if (t_success) t_success = MCMemoryNew(self); if (t_success) t_success = TextFileFetch(p_filename, self -> input_buffer, self -> input_limit); if (t_success) t_success = ScannerConsume(self); if (t_success) r_scanner = self; else ScannerDestroy(self); return t_success; } void ScannerDestroy(ScannerRef self) { for(uint32_t i = 0; i < self -> token_frontier; i++) ValueRelease(self -> token_buffer[i] . value); MCMemoryDeleteArray(self -> token_buffer); MCMemoryDeleteArray(self -> input_buffer); MCMemoryDelete(self); } //////////////////////////////////////////////////////////////////////////////// bool ScannerAdvance(ScannerRef self) { bool t_success; t_success = true; if (t_success && self -> token_pointer + 1 == self -> token_frontier) t_success = ScannerConsume(self); if (t_success && self -> token_pointer == self -> token_frontier) t_success = Throw(kErrorCantAdvancePastEnd); if (t_success) self -> token_pointer += 1; return t_success; } bool ScannerRetreat(ScannerRef self) { bool t_success; t_success = true; if (t_success && self -> token_pointer == self -> token_mark) t_success = Throw(kErrorCantRetreatPastMark); if (t_success) self -> token_pointer -= 1; return t_success; } void ScannerMark(ScannerRef self) { self -> token_mark = self -> token_pointer; } bool ScannerRetrieve(ScannerRef self, const Token*& r_token) { bool t_success; t_success = true; if (t_success && self -> token_pointer == self -> token_frontier) t_success = Throw(kErrorNoCurrentToken); if (t_success) r_token = &self -> token_buffer[self -> token_pointer]; return t_success; } //////////////////////////////////////////////////////////////////////////////// |
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