| 1 | #include <malloc.h> |
| 2 | #include <math.h> |
| 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <string.h> |
| 6 | |
| 7 | #include "debug.h" |
| 8 | |
| 9 | #include "parser.h" |
| 10 | |
| 11 | /* global variables */ |
| 12 | |
| 13 | double answer = 0; |
| 14 | |
| 15 | #define STORAGE_SIZE 10 |
| 16 | double storage[STORAGE_SIZE] = {0}; |
| 17 | |
| 18 | /* compare codes */ |
| 19 | |
| 20 | int codecmp (char *ref, char *str) |
| 21 | { |
| 22 | int sig; |
| 23 | |
| 24 | while (*ref != '\0') { |
| 25 | if (*ref == '\t') { |
| 26 | sig = (*str == '.') ? -1 : ((*str >= '0') && (*str <= '9')); |
| 27 | } else { |
| 28 | sig = *str - *ref; |
| 29 | } |
| 30 | if (sig != 0) { |
| 31 | return (sig > 0) ? 1 : -1; |
| 32 | } |
| 33 | str++; |
| 34 | ref++; |
| 35 | } |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | /* allocate new element */ |
| 41 | |
| 42 | element_t *newelement (func_t function, int nbops, int prio) |
| 43 | { |
| 44 | element_t *new = (element_t *) calloc (1, sizeof (element_t)); |
| 45 | if (new == NULL) { |
| 46 | VERBOSE (ERROR, fprintf (stderr, "can't allocate memory\n")); |
| 47 | exit (1); |
| 48 | } |
| 49 | if (nbops) { |
| 50 | new->ops = (element_t **) calloc (nbops, sizeof (element_t *)); |
| 51 | if (new->ops == NULL) { |
| 52 | VERBOSE (ERROR, fprintf (stderr, "can't allocate memory\n")); |
| 53 | exit (1); |
| 54 | } |
| 55 | } |
| 56 | new->func = function; |
| 57 | new->nbops = nbops; |
| 58 | new->prio = prio; |
| 59 | |
| 60 | return new; |
| 61 | } |
| 62 | |
| 63 | /* desallocate element */ |
| 64 | |
| 65 | void delelement (element_t *root) |
| 66 | { |
| 67 | if ((root != NULL) && (root != ERROR_OP)) { |
| 68 | int i; |
| 69 | for (i = 0; i < root->nbops; i++) { |
| 70 | if ((root->ops[i] != NULL) && (root->ops[i] != ERROR_OP)) { |
| 71 | delelement (root->ops[i]); |
| 72 | } |
| 73 | } |
| 74 | if (root->nbops) { |
| 75 | free (root->ops); |
| 76 | } |
| 77 | free (root); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | /* duplicate element */ |
| 82 | |
| 83 | element_t *dupelement (element_t *root) |
| 84 | { |
| 85 | element_t *tmp = NULL; |
| 86 | int i; |
| 87 | |
| 88 | if ((root == NULL) || (root == ERROR_OP)) { |
| 89 | return root; |
| 90 | } |
| 91 | tmp = newelement (root->func, root->nbops, root->prio); |
| 92 | tmp->value = root->value; |
| 93 | for (i = 0; i < root->nbops; i++) { |
| 94 | tmp->ops[i] = dupelement (root->ops[i]); |
| 95 | } |
| 96 | return tmp; |
| 97 | } |
| 98 | |
| 99 | /* functions */ |
| 100 | |
| 101 | #define NB_OPERATORS 14 |
| 102 | keyword_t operators[NB_OPERATORS] = { |
| 103 | { "+\t", Add, 2, 1, 1}, |
| 104 | { "-\t", Sub, 2, 1, 1}, |
| 105 | { "*", Mul, 2, 1, 2}, |
| 106 | { "/", Div, 2, 1, 2}, |
| 107 | { "%", Mod, 2, 1, 3}, |
| 108 | { "^", Pow, 2, 1, 4}, |
| 109 | { "==", Equal, 2, 2, -1}, |
| 110 | { "!=", Diff, 2, 2, -1}, |
| 111 | { ">=", Ge, 2, 2, -1}, |
| 112 | { "<=", Le, 2, 2, -1}, |
| 113 | { ">", Gt, 2, 1, -1}, |
| 114 | { "<", Lt, 2, 1, -1}, |
| 115 | { "&", And, 2, 1, -2}, |
| 116 | { "|", Or, 2, 1, -2} |
| 117 | }; |
| 118 | |
| 119 | #define NB_FUNCTIONS 23 |
| 120 | keyword_t functions[NB_FUNCTIONS] = { |
| 121 | { "sqrt", Sqr, 1, 4, 5}, |
| 122 | { "pow", Pow, 2, 3, 5}, |
| 123 | { "cos", Cos, 1, 3, 5}, |
| 124 | { "sin", Sin, 1, 3, 5}, |
| 125 | { "tan", Tan, 1, 3, 5}, |
| 126 | { "acos", Acos, 1, 4, 5}, |
| 127 | { "asin", Asin, 1, 4, 5}, |
| 128 | { "atan", Atan, 1, 4, 5}, |
| 129 | { "log", Log, 1, 3, 5}, |
| 130 | { "exp", Exp, 1, 3, 5}, |
| 131 | { "abs", Abs, 1, 3, 5}, |
| 132 | { "floor", Floor, 1, 5, 5}, |
| 133 | { "ceil", Ceil, 1, 4, 5}, |
| 134 | { "sto", Store, 2, 3, 5}, |
| 135 | { "rcl", Recall, 1, 3, 5}, |
| 136 | { "inc", Inc, 1, 3, 5}, |
| 137 | { "dec", Dec, 1, 3, 5}, |
| 138 | { "disp", Disp, 0, 4, 9}, |
| 139 | { "quit", Quit, 0, 4, 9}, |
| 140 | { "help", Help, 0, 4, 9}, |
| 141 | { "!", Not, 1, 1, 6}, |
| 142 | { "cond", Cond, 3, 4, 5}, |
| 143 | { "while", While, 2, 5, 5} |
| 144 | }; |
| 145 | |
| 146 | #define NB_CONSTANTS 3 |
| 147 | keyword_t constants[NB_CONSTANTS] = { |
| 148 | { "ans", Ans, 0, 3, 5}, |
| 149 | { "e", E, 0, 1, 5}, |
| 150 | { "pi", Pi, 0, 2, 5} |
| 151 | }; |
| 152 | |
| 153 | #define NB_SYMBOLS 4 |
| 154 | char *symbols[NB_SYMBOLS] = { |
| 155 | "(", ")", "{", "}" |
| 156 | }; |
| 157 | |
| 158 | /* subparser function */ |
| 159 | |
| 160 | element_t *subparser (element_t **proot, char **pstr, func_t func, int nbops, int prio) |
| 161 | { |
| 162 | element_t *new = newelement (func, nbops, prio); |
| 163 | new->ops[0] = *proot; |
| 164 | new->ops[1] = parser (*pstr, pstr, new->prio); |
| 165 | if ((new->ops[1] == NULL) || ((new->ops[1] != ERROR_OP) && (new->ops[1]->prio == 9))) { |
| 166 | delelement (new->ops[1]); |
| 167 | new->ops[1] = ERROR_OP; |
| 168 | } |
| 169 | if (new->ops[1] == ERROR_OP) { |
| 170 | delelement (new); |
| 171 | *proot = NULL; |
| 172 | return ERROR_OP; |
| 173 | } |
| 174 | *proot = newelement (Val, 1, 5); |
| 175 | (*proot)->ops[0] = new; |
| 176 | |
| 177 | return *proot; |
| 178 | } |
| 179 | |
| 180 | /* parser function */ |
| 181 | |
| 182 | element_t *parser (char *str, char **next, int prio) |
| 183 | { |
| 184 | element_t *root = NULL; |
| 185 | int i; |
| 186 | |
| 187 | VERBOSE (DEBUG, fprintf (stdout, "Starting parsing\n")); |
| 188 | |
| 189 | /* main loop */ |
| 190 | while (*str != '\0') { |
| 191 | int found = 0; |
| 192 | element_t *new = NULL; |
| 193 | VERBOSE (INFO, fprintf (stdout, "Processing: %s\n", str)); |
| 194 | |
| 195 | /* skip spaces and tabs */ |
| 196 | |
| 197 | if ((*str == ' ') || (*str == '\t')) { |
| 198 | str++; |
| 199 | continue; |
| 200 | } |
| 201 | |
| 202 | /* check for open brace */ |
| 203 | |
| 204 | if (*str == '{') { |
| 205 | VERBOSE (DEBUG, fprintf (stdout, "start processing brace\n")); |
| 206 | if (root != NULL) { |
| 207 | delelement (root); |
| 208 | return ERROR_OP; |
| 209 | } |
| 210 | element_t **prog = NULL; |
| 211 | new = newelement (Prog, 0, 5); |
| 212 | root = new; |
| 213 | prog = &root; |
| 214 | |
| 215 | do { |
| 216 | new = parser (str + 1, &str, 0); |
| 217 | if ((new == NULL) || ((new != ERROR_OP) && (new->prio == 9))) { |
| 218 | delelement (new); |
| 219 | new = ERROR_OP; |
| 220 | } |
| 221 | if (new == ERROR_OP) { |
| 222 | delelement (root); |
| 223 | return ERROR_OP; |
| 224 | } |
| 225 | element_t *newprog = newelement (Prog, (*prog)->nbops + 1, 5); |
| 226 | for (i = 0; i < (*prog)->nbops; i++) { |
| 227 | newprog->ops[i] = (*prog)->ops[i]; |
| 228 | (*prog)->ops[i] = NULL; |
| 229 | } |
| 230 | newprog->ops[(*prog)->nbops] = new; |
| 231 | delelement (*prog); |
| 232 | (*prog) = newprog; |
| 233 | } while (*str == ','); |
| 234 | |
| 235 | if (*str != '}') { |
| 236 | delelement (root); |
| 237 | return ERROR_OP; |
| 238 | } |
| 239 | str++; |
| 240 | VERBOSE (DEBUG, fprintf (stdout, "stop processing brace\n")); |
| 241 | continue; |
| 242 | } |
| 243 | |
| 244 | /* check for open bracket */ |
| 245 | |
| 246 | if (*str == '(') { |
| 247 | VERBOSE (DEBUG, fprintf (stdout, "start processing bracket\n")); |
| 248 | if (root) { |
| 249 | do { |
| 250 | found = 0; |
| 251 | new = parser (str + 1, &str, 0); |
| 252 | if ((new == NULL) || ((new != ERROR_OP) && (new->prio == 9))) { |
| 253 | delelement (new); |
| 254 | new = ERROR_OP; |
| 255 | } |
| 256 | if ((new == NULL) || (new == ERROR_OP)) { |
| 257 | delelement (root); |
| 258 | return ERROR_OP; |
| 259 | } |
| 260 | for (i = 0; i < root->nbops; i++) { |
| 261 | if (root->ops[i] == NULL) { |
| 262 | root->ops[i] = new; |
| 263 | found = 1; |
| 264 | break; |
| 265 | } |
| 266 | } |
| 267 | if (!found) { |
| 268 | delelement (new); |
| 269 | delelement (root); |
| 270 | return ERROR_OP; |
| 271 | } |
| 272 | } while (*str == ','); |
| 273 | } else { |
| 274 | root = newelement (Val, 1, 5); |
| 275 | new = parser (str + 1, &str, 0); |
| 276 | if ((new == NULL) || ((new != ERROR_OP) && (new->prio == 9))) { |
| 277 | delelement (new); |
| 278 | new = ERROR_OP; |
| 279 | } |
| 280 | if ((new == NULL) || (new == ERROR_OP) || (*str == ',')) { |
| 281 | delelement (new); |
| 282 | delelement (root); |
| 283 | return ERROR_OP; |
| 284 | } |
| 285 | root->ops[0] = new; |
| 286 | } |
| 287 | if (*str != ')') { |
| 288 | delelement (root); |
| 289 | return ERROR_OP; |
| 290 | } |
| 291 | str++; |
| 292 | VERBOSE (DEBUG, fprintf (stdout, "stop processing bracket\n")); |
| 293 | continue; |
| 294 | } |
| 295 | |
| 296 | /* check for closing bracket, closing brace or koma */ |
| 297 | |
| 298 | if ((*str == ')') || (*str == '}') || (*str == ',')) { |
| 299 | if (prio == -9) { |
| 300 | delelement (root); |
| 301 | return ERROR_OP; |
| 302 | } |
| 303 | if (next != NULL) { |
| 304 | *next = str; |
| 305 | } |
| 306 | return root; |
| 307 | } |
| 308 | |
| 309 | /* look for operators */ |
| 310 | |
| 311 | for (i = 0; i < NB_OPERATORS; i++) { |
| 312 | keyword_t *operator = operators + i; |
| 313 | if (codecmp (operator->keyword, str) == 0) { |
| 314 | VERBOSE (DEBUG, fprintf (stdout, "start processing operator\n")); |
| 315 | if (root) { |
| 316 | if ((prio) && (prio > operator->prio)) { |
| 317 | VERBOSE (DEBUG, fprintf (stdout, "stop because operator priority\n")); |
| 318 | *next = str; |
| 319 | return root; |
| 320 | } |
| 321 | str += operator->offset; |
| 322 | VERBOSE (INFO, fprintf (stdout, "Oper: %d\n", operator->func)); |
| 323 | if (subparser (&root, &str, operator->func, operator->nbops, operator->prio) == ERROR_OP) { |
| 324 | delelement (root); |
| 325 | return ERROR_OP; |
| 326 | } |
| 327 | } else if (*str == '-') { |
| 328 | root = newelement (Sig, 1, 9); |
| 329 | } else { |
| 330 | return ERROR_OP; |
| 331 | } |
| 332 | found = 1; |
| 333 | VERBOSE (DEBUG, fprintf (stdout, "stop processing operator\n")); |
| 334 | break; |
| 335 | } |
| 336 | } |
| 337 | if (found) { |
| 338 | continue; |
| 339 | } |
| 340 | |
| 341 | /* look for functions */ |
| 342 | |
| 343 | for (i = 0; i < NB_FUNCTIONS; i++) { |
| 344 | keyword_t *function = functions + i; |
| 345 | if (codecmp (function->keyword, str) == 0) { |
| 346 | VERBOSE (DEBUG, fprintf (stdout, "start processing function\n")); |
| 347 | if (root == NULL) { |
| 348 | VERBOSE (INFO, fprintf (stdout, "Func: %d\n", function->func)); |
| 349 | root = newelement (function->func, function->nbops, function->prio); |
| 350 | } else { |
| 351 | delelement (root); |
| 352 | return ERROR_OP; |
| 353 | } |
| 354 | str += function->offset; |
| 355 | found = 1; |
| 356 | VERBOSE (DEBUG, fprintf (stdout, "stop processing function\n")); |
| 357 | break; |
| 358 | } |
| 359 | } |
| 360 | if (found) { |
| 361 | continue; |
| 362 | } |
| 363 | |
| 364 | /* look for constant */ |
| 365 | |
| 366 | for (i = 0; i < NB_CONSTANTS; i++) { |
| 367 | keyword_t *constant = constants + i; |
| 368 | if (codecmp (constant->keyword, str) == 0) { |
| 369 | VERBOSE (DEBUG, fprintf (stdout, "start processing constant\n")); |
| 370 | if (root == NULL) { |
| 371 | VERBOSE (INFO, fprintf (stdout, "Const: %d\n", constant->func)); |
| 372 | root = newelement (constant->func, constant->nbops, constant->prio); |
| 373 | } else { |
| 374 | delelement (root); |
| 375 | return ERROR_OP; |
| 376 | } |
| 377 | str += constant->offset; |
| 378 | found = 1; |
| 379 | VERBOSE (DEBUG, fprintf (stdout, "stop processing constant\n")); |
| 380 | break; |
| 381 | } |
| 382 | } |
| 383 | if (found) { |
| 384 | continue; |
| 385 | } |
| 386 | |
| 387 | /* look for number */ |
| 388 | |
| 389 | if (((*str >= '0') && (*str <= '9')) || |
| 390 | (*str == '.') || (*str == '+') || (*str == '-')) { |
| 391 | VERBOSE (DEBUG, fprintf (stdout, "start processing value\n")); |
| 392 | char *pt; |
| 393 | double value = strtod (str, &pt); |
| 394 | VERBOSE (INFO, fprintf (stdout, "Value: %f\n", value)); |
| 395 | if (str != pt) { |
| 396 | if ((root == NULL) || (root->prio == 6)) { |
| 397 | new = newelement (Val, 1, 5); |
| 398 | new->value = value; |
| 399 | if (root == NULL) { |
| 400 | root = new; |
| 401 | } else { |
| 402 | for (i = 0; i < root->nbops; i++) { |
| 403 | if (root->ops[i] == NULL) { |
| 404 | root->ops[i] = new; |
| 405 | found = 1; |
| 406 | break; |
| 407 | } |
| 408 | } |
| 409 | if (!found) { |
| 410 | delelement (new); |
| 411 | delelement (root); |
| 412 | return ERROR_OP; |
| 413 | } |
| 414 | } |
| 415 | str = pt; |
| 416 | } else if ((*str == '+') || (*str == '-')) { |
| 417 | if ((prio) && (prio > 1)) { |
| 418 | VERBOSE (DEBUG, fprintf (stdout, "stop because operator priority\n")); |
| 419 | *next = str; |
| 420 | return root; |
| 421 | } |
| 422 | if (subparser (&root, &str, Add, 2, 1) == ERROR_OP) { |
| 423 | delelement (root); |
| 424 | return ERROR_OP; |
| 425 | } |
| 426 | } else { |
| 427 | delelement (root); |
| 428 | return ERROR_OP; |
| 429 | } |
| 430 | found = 1; |
| 431 | } |
| 432 | VERBOSE (DEBUG, fprintf (stdout, "stop processing value\n")); |
| 433 | } |
| 434 | |
| 435 | /* error */ |
| 436 | |
| 437 | if (!found) { |
| 438 | delelement (root); |
| 439 | return ERROR_OP; |
| 440 | } |
| 441 | |
| 442 | } |
| 443 | |
| 444 | if (next != NULL) { |
| 445 | *next = str; |
| 446 | } |
| 447 | |
| 448 | return root; |
| 449 | } |
| 450 | |
| 451 | /* print element tree */ |
| 452 | |
| 453 | void print_element (element_t *root, int level) |
| 454 | { |
| 455 | char *func = NULL; |
| 456 | int i; |
| 457 | |
| 458 | if ((root == NULL) || (root == ERROR_OP)) { |
| 459 | return; |
| 460 | } |
| 461 | |
| 462 | for (i = 0; i < level; i++) { |
| 463 | fprintf (stdout, " "); |
| 464 | } |
| 465 | |
| 466 | switch (root->func) { |
| 467 | case Val: func = "Value"; break; |
| 468 | case Sig: func = "Sign"; break; |
| 469 | case Add: func = "Addition"; break; |
| 470 | case Sub: func = "Subtraction"; break; |
| 471 | case Mul: func = "Multiplication"; break; |
| 472 | case Div: func = "Division"; break; |
| 473 | case Mod: func = "Modulo"; break; |
| 474 | case Pow: func = "Power"; break; |
| 475 | case Sqr: func = "Square Root"; break; |
| 476 | case Cos: func = "Cosine"; break; |
| 477 | case Sin: func = "Sine"; break; |
| 478 | case Tan: func = "Tangent"; break; |
| 479 | case Acos: func = "Arc Cosine"; break; |
| 480 | case Asin: func = "Arc Sine"; break; |
| 481 | case Atan: func = "Arc Tangent"; break; |
| 482 | case Log: func = "Logarithm"; break; |
| 483 | case Exp: func = "Exponantial"; break; |
| 484 | case Abs: func = "Absolute value"; break; |
| 485 | case Ceil: func = "Ceil value"; break; |
| 486 | case Floor: func = "Floor value"; break; |
| 487 | case Store: func = "Store"; break; |
| 488 | case Recall: func = "Recall"; break; |
| 489 | case Inc: func = "Increase"; break; |
| 490 | case Dec: func = "Decrease"; break; |
| 491 | case Disp: func = "Display"; break; |
| 492 | case Quit: func = "Quit"; break; |
| 493 | case Help: func = "Help"; break; |
| 494 | case Ans: func = "Ans"; break; |
| 495 | case Pi: func = "Pi"; break; |
| 496 | case E: func = "E"; break; |
| 497 | case Equal: func = "Equal"; break; |
| 498 | case Diff: func = "Different"; break; |
| 499 | case Ge: func = "Greater or equal"; break; |
| 500 | case Le: func = "Lesser or equal"; break; |
| 501 | case Gt: func = "Greater"; break; |
| 502 | case Lt: func = "Lesser"; break; |
| 503 | case And: func = "And"; break; |
| 504 | case Or: func = "Or"; break; |
| 505 | case Not: func = "Not"; break; |
| 506 | case Cond: func = "Condition"; break; |
| 507 | case While: func = "While"; break; |
| 508 | case Prog: func = "Program"; break; |
| 509 | } |
| 510 | |
| 511 | fprintf (stdout, "Function: %s\n", func); |
| 512 | |
| 513 | if ((root->func == Val) && (root->ops[0] == NULL)) { |
| 514 | for (i = 0; i < level; i++) { |
| 515 | fprintf (stdout, " "); |
| 516 | } |
| 517 | fprintf (stdout, "value: %f\n", root->value); |
| 518 | } else { |
| 519 | for (i = 0; i < root->nbops; i++) { |
| 520 | print_element (root->ops[i], level + 1); |
| 521 | } |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | /* storage functions */ |
| 526 | |
| 527 | double store (int index, double value) |
| 528 | { |
| 529 | if ((index > 0) && (index <= STORAGE_SIZE)) { |
| 530 | storage[index - 1] = value; |
| 531 | } else { |
| 532 | VERBOSE (WARNING, fprintf (stdout, "invalid index (%d) [1, %d]\n", index, STORAGE_SIZE)); |
| 533 | } |
| 534 | return value; |
| 535 | } |
| 536 | |
| 537 | double recall (int index) |
| 538 | { |
| 539 | if ((index > 0) && (index <= STORAGE_SIZE)) { |
| 540 | return storage[index - 1]; |
| 541 | } else { |
| 542 | VERBOSE (WARNING, fprintf (stdout, "invalid index (%d) [1, %d]\n", index, STORAGE_SIZE)); |
| 543 | } |
| 544 | return 0; |
| 545 | } |
| 546 | |
| 547 | double increase (int index) |
| 548 | { |
| 549 | if ((index > 0) && (index <= STORAGE_SIZE)) { |
| 550 | return storage[index - 1]++; |
| 551 | } else { |
| 552 | VERBOSE (WARNING, fprintf (stdout, "invalid index (%d) [1, %d]\n", index, STORAGE_SIZE)); |
| 553 | } |
| 554 | return 0; |
| 555 | } |
| 556 | |
| 557 | double decrease (int index) |
| 558 | { |
| 559 | if ((index > 0) && (index <= STORAGE_SIZE)) { |
| 560 | return storage[index - 1]--; |
| 561 | } else { |
| 562 | VERBOSE (WARNING, fprintf (stdout, "invalid index (%d) [1, %d]\n", index, STORAGE_SIZE)); |
| 563 | } |
| 564 | return 0; |
| 565 | } |
| 566 | |
| 567 | void display (void) |
| 568 | { |
| 569 | int i; |
| 570 | fprintf (stdout, "storage:"); |
| 571 | for (i = 0; i < STORAGE_SIZE; i++) { |
| 572 | fprintf (stdout, " %g", storage[i]); |
| 573 | } |
| 574 | fprintf (stdout, "\n"); |
| 575 | } |
| 576 | |
| 577 | /* While do function */ |
| 578 | |
| 579 | double while_do (element_t *cond, element_t *action) |
| 580 | { |
| 581 | double ret = 0; |
| 582 | element_t *temp = NULL; |
| 583 | |
| 584 | VERBOSE (DEBUG, fprintf (stdout, "starting while loop\n")); |
| 585 | while (1) { |
| 586 | VERBOSE (DEBUG, fprintf (stdout, "loop...\n")); |
| 587 | |
| 588 | temp = dupelement (cond); |
| 589 | if (!evaluate_element (temp, 0)) { |
| 590 | break; |
| 591 | } |
| 592 | if (action) { |
| 593 | temp = dupelement (action); |
| 594 | ret = evaluate_element (temp, 0); |
| 595 | } |
| 596 | } |
| 597 | |
| 598 | VERBOSE (DEBUG, fprintf (stdout, "ending while loop\n")); |
| 599 | |
| 600 | return ret; |
| 601 | } |
| 602 | |
| 603 | /* program function */ |
| 604 | |
| 605 | double program_do (element_t **prog, int nbcalls) |
| 606 | { |
| 607 | double ret = 0; |
| 608 | int i; |
| 609 | for (i = 0; i < nbcalls; i++) { |
| 610 | ret = evaluate_element (prog[i], 0); |
| 611 | prog[i] = NULL; |
| 612 | } |
| 613 | return ret; |
| 614 | } |
| 615 | |
| 616 | /* quit function */ |
| 617 | |
| 618 | void quit (void) |
| 619 | { |
| 620 | fprintf (stdout, "bye\n"); |
| 621 | exit (0); |
| 622 | } |
| 623 | |
| 624 | /* help message */ |
| 625 | |
| 626 | void help (void) |
| 627 | { |
| 628 | fprintf (stdout, "calc is a simple calculator\n\n"); |
| 629 | fprintf (stdout, "supported operators:"); |
| 630 | fprintf (stdout, " + - * / %% ^\n"); |
| 631 | fprintf (stdout, "camparison operators:"); |
| 632 | fprintf (stdout, " == != >= <= > <\n"); |
| 633 | fprintf (stdout, "logical operators:"); |
| 634 | fprintf (stdout, " & | !\n"); |
| 635 | fprintf (stdout, "mathematic functions:"); |
| 636 | fprintf (stdout, " pow sqrt log exp\n"); |
| 637 | fprintf (stdout, "trigonometric functions:"); |
| 638 | fprintf (stdout, " cos sin tan acos asin atan\n"); |
| 639 | fprintf (stdout, "supported functions:"); |
| 640 | fprintf (stdout, " abs ceil floor\n"); |
| 641 | fprintf (stdout, "storage functions:"); |
| 642 | fprintf (stdout, " sto rcl inc dec\n"); |
| 643 | fprintf (stdout, "conditional functions:"); |
| 644 | fprintf (stdout, " cond while\n"); |
| 645 | fprintf (stdout, "miscellaneous functions:"); |
| 646 | fprintf (stdout, " quit help\n"); |
| 647 | fprintf (stdout, "supported constants:"); |
| 648 | fprintf (stdout, " e pi\n"); |
| 649 | } |
| 650 | |
| 651 | /* evaluate element tree */ |
| 652 | |
| 653 | #define MASK_SUB 0x1 |
| 654 | #define MASK_DIV 0x2 |
| 655 | |
| 656 | double evaluate_element (element_t *root, char mask) |
| 657 | { |
| 658 | double op0 = 0, op1 = 0; |
| 659 | char nextmask = mask; |
| 660 | |
| 661 | if ((root == NULL) || (root == ERROR_OP)) { |
| 662 | VERBOSE (WARNING, fprintf (stdout, "error while evaluating\n")); |
| 663 | return 0; |
| 664 | } |
| 665 | |
| 666 | /* mask to manage sub operator sub and div */ |
| 667 | switch (root->func) { |
| 668 | case Add: |
| 669 | nextmask &= ~MASK_SUB; |
| 670 | nextmask &= ~MASK_DIV; |
| 671 | break; |
| 672 | case Sub: |
| 673 | nextmask |= MASK_SUB; |
| 674 | nextmask &= ~MASK_DIV; |
| 675 | break; |
| 676 | case Mul: |
| 677 | nextmask &= ~MASK_DIV; |
| 678 | break; |
| 679 | case Div: |
| 680 | nextmask |= MASK_DIV; |
| 681 | break; |
| 682 | default: |
| 683 | nextmask = mask; |
| 684 | } |
| 685 | |
| 686 | switch (root->func) { |
| 687 | case Val: |
| 688 | case Sig: |
| 689 | op0 = (root->ops[0]) ? evaluate_element (root->ops[0], nextmask) : root->value; |
| 690 | break; |
| 691 | case Add: |
| 692 | case Sub: |
| 693 | case Mul: |
| 694 | case Div: |
| 695 | case Mod: |
| 696 | case Pow: |
| 697 | case Store: |
| 698 | case Equal: |
| 699 | case Diff: |
| 700 | case Ge: |
| 701 | case Le: |
| 702 | case Gt: |
| 703 | case Lt: |
| 704 | case And: |
| 705 | case Or: |
| 706 | if (root->ops[1]) { |
| 707 | op1 = evaluate_element (root->ops[1], nextmask); |
| 708 | } else if (root->func != Store) { |
| 709 | VERBOSE (WARNING, fprintf (stdout, "error while evaluating (op[1])\n")); |
| 710 | return 0; |
| 711 | } |
| 712 | /* fallthrough */ |
| 713 | case Sqr: |
| 714 | case Cos: |
| 715 | case Sin: |
| 716 | case Tan: |
| 717 | case Acos: |
| 718 | case Asin: |
| 719 | case Atan: |
| 720 | case Log: |
| 721 | case Exp: |
| 722 | case Abs: |
| 723 | case Ceil: |
| 724 | case Floor: |
| 725 | case Recall: |
| 726 | case Inc: |
| 727 | case Dec: |
| 728 | case Not: |
| 729 | case Cond: |
| 730 | if (root->ops[0]) { |
| 731 | op0 = evaluate_element (root->ops[0], 0); |
| 732 | } else { |
| 733 | VERBOSE (WARNING, fprintf (stdout, "error while evaluating (op[0])\n")); |
| 734 | return 0; |
| 735 | } |
| 736 | break; |
| 737 | case Disp: |
| 738 | case Quit: |
| 739 | case Help: |
| 740 | case Ans: |
| 741 | case Pi: |
| 742 | case E: |
| 743 | case Prog: |
| 744 | break; |
| 745 | case While: |
| 746 | if (root->ops[0] == NULL) { |
| 747 | VERBOSE (WARNING, fprintf (stdout, "error while evaluating (op[0])\n")); |
| 748 | return 0; |
| 749 | } |
| 750 | break; |
| 751 | } |
| 752 | |
| 753 | switch (root->func) { |
| 754 | case Val: return op0; |
| 755 | case Sig: return -op0; |
| 756 | case Add: return ((mask & MASK_SUB) == 0) ? op0 + op1 : op0 - op1; |
| 757 | case Sub: return ((mask & MASK_SUB) == 0) ? op0 - op1 : op0 + op1; |
| 758 | case Mul: return ((mask & MASK_DIV) == 0) ? op0 * op1 : op0 / op1; |
| 759 | case Div: return ((mask & MASK_DIV) == 0) ? op0 / op1 : op0 * op1; |
| 760 | case Mod: return fmod (op0, op1); |
| 761 | case Pow: return pow (op0, op1); |
| 762 | case Sqr: return sqrt (op0); |
| 763 | case Cos: return cos (op0); |
| 764 | case Sin: return sin (op0); |
| 765 | case Tan: return tan (op0); |
| 766 | case Acos: return acos (op0); |
| 767 | case Asin: return asin (op0); |
| 768 | case Atan: return atan (op0); |
| 769 | case Log: return log (op0); |
| 770 | case Exp: return exp (op0); |
| 771 | case Abs: return fabs (op0); |
| 772 | case Ceil: return ceil (op0); |
| 773 | case Floor: return floor (op0); |
| 774 | case Store: return store ((int)op0, (op1) ? op1 : answer); |
| 775 | case Recall: return recall ((int)op0); |
| 776 | case Inc: return increase ((int)op0); |
| 777 | case Dec: return decrease ((int)op0); |
| 778 | case Disp: display (); break; |
| 779 | case Quit: quit (); break; |
| 780 | case Help: help (); break; |
| 781 | case Ans: return answer; |
| 782 | case Pi: return M_PI; |
| 783 | case E: return M_E; |
| 784 | case Equal: return op0 == op1; |
| 785 | case Diff: return op0 != op1; |
| 786 | case Ge: return op0 >= op1; |
| 787 | case Le: return op0 <= op1; |
| 788 | case Gt: return op0 > op1; |
| 789 | case Lt: return op0 < op1; |
| 790 | case And: return (op0 != 0) && (op1 != 0); |
| 791 | case Or: return (op0 != 0) || (op1 != 0); |
| 792 | case Not: return (op0 == 0); |
| 793 | case Cond: |
| 794 | if ((op0) && (root->ops[1])) { |
| 795 | return evaluate_element (root->ops[1], 0); |
| 796 | } else if ((!op0) && (root->ops[2])) { |
| 797 | return evaluate_element (root->ops[2], 0); |
| 798 | } else { |
| 799 | return 0; |
| 800 | } |
| 801 | case While: return while_do (root->ops[0], root->ops[1]); |
| 802 | case Prog: return program_do (root->ops, root->nbops); |
| 803 | } |
| 804 | |
| 805 | return 0; |
| 806 | } |
| 807 | |
| 808 | char **generate_completion_list () |
| 809 | { |
| 810 | int i, j, l = 0; |
| 811 | char **list = (char **) calloc (NB_OPERATORS + NB_FUNCTIONS + NB_CONSTANTS + NB_SYMBOLS + 1, sizeof (char *)); |
| 812 | if (list == NULL) { |
| 813 | VERBOSE (ERROR, fprintf (stderr, "can't allocate memory\n")); |
| 814 | exit (1); |
| 815 | } |
| 816 | |
| 817 | for (i = 0; i < NB_OPERATORS; i++) { |
| 818 | list[l] = strdup ((operators + i)->keyword); |
| 819 | for (j = 0; j < (int)strlen (list[l]); j++) { |
| 820 | if (list[i][j] == '\t') { |
| 821 | list[i][j] = '\0'; |
| 822 | } |
| 823 | } |
| 824 | if (list[l] == NULL) { |
| 825 | VERBOSE (ERROR, fprintf (stderr, "can't allocate memory\n")); |
| 826 | exit (1); |
| 827 | } |
| 828 | l++; |
| 829 | } |
| 830 | |
| 831 | for (i = 0; i < NB_FUNCTIONS; i++) { |
| 832 | list[l] = strdup ((functions + i)->keyword); |
| 833 | if (list[l] == NULL) { |
| 834 | VERBOSE (ERROR, fprintf (stderr, "can't allocate memory\n")); |
| 835 | exit (1); |
| 836 | } |
| 837 | l++; |
| 838 | } |
| 839 | |
| 840 | for (i = 0; i < NB_CONSTANTS; i++) { |
| 841 | list[l] = strdup ((constants + i)->keyword); |
| 842 | if (list[l] == NULL) { |
| 843 | VERBOSE (ERROR, fprintf (stderr, "can't allocate memory\n")); |
| 844 | exit (1); |
| 845 | } |
| 846 | l++; |
| 847 | } |
| 848 | |
| 849 | for (i = 0; i < NB_SYMBOLS; i++) { |
| 850 | list[l] = strdup (symbols[i]); |
| 851 | if (list[l] == NULL) { |
| 852 | VERBOSE (ERROR, fprintf (stderr, "can't allocate memory\n")); |
| 853 | exit (1); |
| 854 | } |
| 855 | l++; |
| 856 | } |
| 857 | |
| 858 | return (list); |
| 859 | } |
| 860 | |
| 861 | void free_completion_list (char **list) |
| 862 | { |
| 863 | int i; |
| 864 | |
| 865 | if (list) { |
| 866 | for (i = 0; i < NB_FUNCTIONS + NB_CONSTANTS; i++) { |
| 867 | if (list[i] != NULL) { |
| 868 | free (list[i]); |
| 869 | } |
| 870 | } |
| 871 | free (list); |
| 872 | } |
| 873 | } |
| 874 | |
| 875 | |
| 876 | /* vim: set ts=4 sw=4 et: */ |