Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 1 | /* Built-in functions */ |
| 2 | |
| 3 | #include "allobjects.h" |
| 4 | |
| 5 | #include "node.h" |
| 6 | #include "graminit.h" |
| 7 | #include "errcode.h" |
| 8 | #include "sysmodule.h" |
Guido van Rossum | 86cd6e6 | 1991-01-21 15:12:35 +0000 | [diff] [blame^] | 9 | #include "bltinmodule.h" |
Guido van Rossum | 3f5da24 | 1990-12-20 15:06:42 +0000 | [diff] [blame] | 10 | #include "import.h" |
| 11 | #include "pythonrun.h" |
| 12 | #include "compile.h" /* For ceval.h */ |
| 13 | #include "ceval.h" |
| 14 | #include "modsupport.h" |
| 15 | |
| 16 | static object * |
| 17 | builtin_abs(self, v) |
| 18 | object *self; |
| 19 | object *v; |
| 20 | { |
| 21 | /* XXX This should be a method in the as_number struct in the type */ |
| 22 | if (v == NULL) { |
| 23 | /* */ |
| 24 | } |
| 25 | else if (is_intobject(v)) { |
| 26 | long x = getintvalue(v); |
| 27 | if (x < 0) |
| 28 | x = -x; |
| 29 | return newintobject(x); |
| 30 | } |
| 31 | else if (is_floatobject(v)) { |
| 32 | double x = getfloatvalue(v); |
| 33 | if (x < 0) |
| 34 | x = -x; |
| 35 | return newfloatobject(x); |
| 36 | } |
| 37 | err_setstr(TypeError, "abs() argument must be float or int"); |
| 38 | return NULL; |
| 39 | } |
| 40 | |
| 41 | static object * |
| 42 | builtin_chr(self, v) |
| 43 | object *self; |
| 44 | object *v; |
| 45 | { |
| 46 | long x; |
| 47 | char s[1]; |
| 48 | if (v == NULL || !is_intobject(v)) { |
| 49 | err_setstr(TypeError, "chr() must have int argument"); |
| 50 | return NULL; |
| 51 | } |
| 52 | x = getintvalue(v); |
| 53 | if (x < 0 || x >= 256) { |
| 54 | err_setstr(RuntimeError, "chr() arg not in range(256)"); |
| 55 | return NULL; |
| 56 | } |
| 57 | s[0] = x; |
| 58 | return newsizedstringobject(s, 1); |
| 59 | } |
| 60 | |
| 61 | static object * |
| 62 | builtin_dir(self, v) |
| 63 | object *self; |
| 64 | object *v; |
| 65 | { |
| 66 | object *d; |
| 67 | if (v == NULL) { |
| 68 | d = getlocals(); |
| 69 | } |
| 70 | else { |
| 71 | if (!is_moduleobject(v)) { |
| 72 | err_setstr(TypeError, |
| 73 | "dir() argument, must be module or absent"); |
| 74 | return NULL; |
| 75 | } |
| 76 | d = getmoduledict(v); |
| 77 | } |
| 78 | v = getdictkeys(d); |
| 79 | if (sortlist(v) != 0) { |
| 80 | DECREF(v); |
| 81 | v = NULL; |
| 82 | } |
| 83 | return v; |
| 84 | } |
| 85 | |
| 86 | static object * |
| 87 | builtin_divmod(self, v) |
| 88 | object *self; |
| 89 | object *v; |
| 90 | { |
| 91 | object *x, *y; |
| 92 | long xi, yi, xdivy, xmody; |
| 93 | if (v == NULL || !is_tupleobject(v) || gettuplesize(v) != 2) { |
| 94 | err_setstr(TypeError, "divmod() requires 2 int arguments"); |
| 95 | return NULL; |
| 96 | } |
| 97 | x = gettupleitem(v, 0); |
| 98 | y = gettupleitem(v, 1); |
| 99 | if (!is_intobject(x) || !is_intobject(y)) { |
| 100 | err_setstr(TypeError, "divmod() requires 2 int arguments"); |
| 101 | return NULL; |
| 102 | } |
| 103 | xi = getintvalue(x); |
| 104 | yi = getintvalue(y); |
| 105 | if (yi == 0) { |
| 106 | err_setstr(TypeError, "divmod() division by zero"); |
| 107 | return NULL; |
| 108 | } |
| 109 | if (yi < 0) { |
| 110 | xdivy = -xi / -yi; |
| 111 | } |
| 112 | else { |
| 113 | xdivy = xi / yi; |
| 114 | } |
| 115 | xmody = xi - xdivy*yi; |
| 116 | if (xmody < 0 && yi > 0 || xmody > 0 && yi < 0) { |
| 117 | xmody += yi; |
| 118 | xdivy -= 1; |
| 119 | } |
| 120 | v = newtupleobject(2); |
| 121 | x = newintobject(xdivy); |
| 122 | y = newintobject(xmody); |
| 123 | if (v == NULL || x == NULL || y == NULL || |
| 124 | settupleitem(v, 0, x) != 0 || |
| 125 | settupleitem(v, 1, y) != 0) { |
| 126 | XDECREF(v); |
| 127 | XDECREF(x); |
| 128 | XDECREF(y); |
| 129 | return NULL; |
| 130 | } |
| 131 | return v; |
| 132 | } |
| 133 | |
| 134 | static object * |
| 135 | exec_eval(v, start) |
| 136 | object *v; |
| 137 | int start; |
| 138 | { |
| 139 | object *str = NULL, *globals = NULL, *locals = NULL; |
| 140 | int n; |
| 141 | if (v != NULL) { |
| 142 | if (is_stringobject(v)) |
| 143 | str = v; |
| 144 | else if (is_tupleobject(v) && |
| 145 | ((n = gettuplesize(v)) == 2 || n == 3)) { |
| 146 | str = gettupleitem(v, 0); |
| 147 | globals = gettupleitem(v, 1); |
| 148 | if (n == 3) |
| 149 | locals = gettupleitem(v, 2); |
| 150 | } |
| 151 | } |
| 152 | if (str == NULL || !is_stringobject(str) || |
| 153 | globals != NULL && !is_dictobject(globals) || |
| 154 | locals != NULL && !is_dictobject(locals)) { |
| 155 | err_setstr(TypeError, |
| 156 | "exec/eval arguments must be string[,dict[,dict]]"); |
| 157 | return NULL; |
| 158 | } |
| 159 | return run_string(getstringvalue(str), start, globals, locals); |
| 160 | } |
| 161 | |
| 162 | static object * |
| 163 | builtin_eval(self, v) |
| 164 | object *self; |
| 165 | object *v; |
| 166 | { |
| 167 | return exec_eval(v, eval_input); |
| 168 | } |
| 169 | |
| 170 | static object * |
| 171 | builtin_exec(self, v) |
| 172 | object *self; |
| 173 | object *v; |
| 174 | { |
| 175 | return exec_eval(v, file_input); |
| 176 | } |
| 177 | |
| 178 | static object * |
| 179 | builtin_float(self, v) |
| 180 | object *self; |
| 181 | object *v; |
| 182 | { |
| 183 | if (v == NULL) { |
| 184 | /* */ |
| 185 | } |
| 186 | else if (is_floatobject(v)) { |
| 187 | INCREF(v); |
| 188 | return v; |
| 189 | } |
| 190 | else if (is_intobject(v)) { |
| 191 | long x = getintvalue(v); |
| 192 | return newfloatobject((double)x); |
| 193 | } |
| 194 | err_setstr(TypeError, "float() argument must be float or int"); |
| 195 | return NULL; |
| 196 | } |
| 197 | |
| 198 | static object * |
| 199 | builtin_input(self, v) |
| 200 | object *self; |
| 201 | object *v; |
| 202 | { |
| 203 | FILE *in = sysgetfile("stdin", stdin); |
| 204 | FILE *out = sysgetfile("stdout", stdout); |
| 205 | node *n; |
| 206 | int err; |
| 207 | object *m, *d; |
| 208 | flushline(); |
| 209 | if (v != NULL) |
| 210 | printobject(v, out, PRINT_RAW); |
| 211 | m = add_module("__main__"); |
| 212 | d = getmoduledict(m); |
| 213 | return run_file(in, "<stdin>", expr_input, d, d); |
| 214 | } |
| 215 | |
| 216 | static object * |
| 217 | builtin_int(self, v) |
| 218 | object *self; |
| 219 | object *v; |
| 220 | { |
| 221 | if (v == NULL) { |
| 222 | /* */ |
| 223 | } |
| 224 | else if (is_intobject(v)) { |
| 225 | INCREF(v); |
| 226 | return v; |
| 227 | } |
| 228 | else if (is_floatobject(v)) { |
| 229 | double x = getfloatvalue(v); |
| 230 | return newintobject((long)x); |
| 231 | } |
| 232 | err_setstr(TypeError, "int() argument must be float or int"); |
| 233 | return NULL; |
| 234 | } |
| 235 | |
| 236 | static object * |
| 237 | builtin_len(self, v) |
| 238 | object *self; |
| 239 | object *v; |
| 240 | { |
| 241 | long len; |
| 242 | typeobject *tp; |
| 243 | if (v == NULL) { |
| 244 | err_setstr(TypeError, "len() without argument"); |
| 245 | return NULL; |
| 246 | } |
| 247 | tp = v->ob_type; |
| 248 | if (tp->tp_as_sequence != NULL) { |
| 249 | len = (*tp->tp_as_sequence->sq_length)(v); |
| 250 | } |
| 251 | else if (tp->tp_as_mapping != NULL) { |
| 252 | len = (*tp->tp_as_mapping->mp_length)(v); |
| 253 | } |
| 254 | else { |
| 255 | err_setstr(TypeError, "len() of unsized object"); |
| 256 | return NULL; |
| 257 | } |
| 258 | return newintobject(len); |
| 259 | } |
| 260 | |
| 261 | static object * |
| 262 | min_max(v, sign) |
| 263 | object *v; |
| 264 | int sign; |
| 265 | { |
| 266 | int i, n, cmp; |
| 267 | object *w, *x; |
| 268 | sequence_methods *sq; |
| 269 | if (v == NULL) { |
| 270 | err_setstr(TypeError, "min() or max() without argument"); |
| 271 | return NULL; |
| 272 | } |
| 273 | sq = v->ob_type->tp_as_sequence; |
| 274 | if (sq == NULL) { |
| 275 | err_setstr(TypeError, "min() or max() of non-sequence"); |
| 276 | return NULL; |
| 277 | } |
| 278 | n = (*sq->sq_length)(v); |
| 279 | if (n == 0) { |
| 280 | err_setstr(RuntimeError, "min() or max() of empty sequence"); |
| 281 | return NULL; |
| 282 | } |
| 283 | w = (*sq->sq_item)(v, 0); /* Implies INCREF */ |
| 284 | for (i = 1; i < n; i++) { |
| 285 | x = (*sq->sq_item)(v, i); /* Implies INCREF */ |
| 286 | cmp = cmpobject(x, w); |
| 287 | if (cmp * sign > 0) { |
| 288 | DECREF(w); |
| 289 | w = x; |
| 290 | } |
| 291 | else |
| 292 | DECREF(x); |
| 293 | } |
| 294 | return w; |
| 295 | } |
| 296 | |
| 297 | static object * |
| 298 | builtin_min(self, v) |
| 299 | object *self; |
| 300 | object *v; |
| 301 | { |
| 302 | return min_max(v, -1); |
| 303 | } |
| 304 | |
| 305 | static object * |
| 306 | builtin_max(self, v) |
| 307 | object *self; |
| 308 | object *v; |
| 309 | { |
| 310 | return min_max(v, 1); |
| 311 | } |
| 312 | |
| 313 | static object * |
| 314 | builtin_open(self, v) |
| 315 | object *self; |
| 316 | object *v; |
| 317 | { |
| 318 | object *name, *mode; |
| 319 | if (v == NULL || !is_tupleobject(v) || gettuplesize(v) != 2 || |
| 320 | !is_stringobject(name = gettupleitem(v, 0)) || |
| 321 | !is_stringobject(mode = gettupleitem(v, 1))) { |
| 322 | err_setstr(TypeError, "open() requires 2 string arguments"); |
| 323 | return NULL; |
| 324 | } |
| 325 | v = newfileobject(getstringvalue(name), getstringvalue(mode)); |
| 326 | return v; |
| 327 | } |
| 328 | |
| 329 | static object * |
| 330 | builtin_ord(self, v) |
| 331 | object *self; |
| 332 | object *v; |
| 333 | { |
| 334 | if (v == NULL || !is_stringobject(v)) { |
| 335 | err_setstr(TypeError, "ord() must have string argument"); |
| 336 | return NULL; |
| 337 | } |
| 338 | if (getstringsize(v) != 1) { |
| 339 | err_setstr(RuntimeError, "ord() arg must have length 1"); |
| 340 | return NULL; |
| 341 | } |
| 342 | return newintobject((long)(getstringvalue(v)[0] & 0xff)); |
| 343 | } |
| 344 | |
| 345 | static object * |
| 346 | builtin_range(self, v) |
| 347 | object *self; |
| 348 | object *v; |
| 349 | { |
| 350 | static char *errmsg = "range() requires 1-3 int arguments"; |
| 351 | int i, n; |
| 352 | long ilow, ihigh, istep; |
| 353 | if (v != NULL && is_intobject(v)) { |
| 354 | ilow = 0; ihigh = getintvalue(v); istep = 1; |
| 355 | } |
| 356 | else if (v == NULL || !is_tupleobject(v)) { |
| 357 | err_setstr(TypeError, errmsg); |
| 358 | return NULL; |
| 359 | } |
| 360 | else { |
| 361 | n = gettuplesize(v); |
| 362 | if (n < 1 || n > 3) { |
| 363 | err_setstr(TypeError, errmsg); |
| 364 | return NULL; |
| 365 | } |
| 366 | for (i = 0; i < n; i++) { |
| 367 | if (!is_intobject(gettupleitem(v, i))) { |
| 368 | err_setstr(TypeError, errmsg); |
| 369 | return NULL; |
| 370 | } |
| 371 | } |
| 372 | if (n == 3) { |
| 373 | istep = getintvalue(gettupleitem(v, 2)); |
| 374 | --n; |
| 375 | } |
| 376 | else |
| 377 | istep = 1; |
| 378 | ihigh = getintvalue(gettupleitem(v, --n)); |
| 379 | if (n > 0) |
| 380 | ilow = getintvalue(gettupleitem(v, 0)); |
| 381 | else |
| 382 | ilow = 0; |
| 383 | } |
| 384 | if (istep == 0) { |
| 385 | err_setstr(RuntimeError, "zero step for range()"); |
| 386 | return NULL; |
| 387 | } |
| 388 | /* XXX ought to check overflow of subtraction */ |
| 389 | if (istep > 0) |
| 390 | n = (ihigh - ilow + istep - 1) / istep; |
| 391 | else |
| 392 | n = (ihigh - ilow + istep + 1) / istep; |
| 393 | if (n < 0) |
| 394 | n = 0; |
| 395 | v = newlistobject(n); |
| 396 | if (v == NULL) |
| 397 | return NULL; |
| 398 | for (i = 0; i < n; i++) { |
| 399 | object *w = newintobject(ilow); |
| 400 | if (w == NULL) { |
| 401 | DECREF(v); |
| 402 | return NULL; |
| 403 | } |
| 404 | setlistitem(v, i, w); |
| 405 | ilow += istep; |
| 406 | } |
| 407 | return v; |
| 408 | } |
| 409 | |
| 410 | static object * |
| 411 | builtin_raw_input(self, v) |
| 412 | object *self; |
| 413 | object *v; |
| 414 | { |
| 415 | FILE *in = sysgetfile("stdin", stdin); |
| 416 | FILE *out = sysgetfile("stdout", stdout); |
| 417 | char *p; |
| 418 | int err; |
| 419 | int n = 1000; |
| 420 | flushline(); |
| 421 | if (v != NULL) |
| 422 | printobject(v, out, PRINT_RAW); |
| 423 | v = newsizedstringobject((char *)NULL, n); |
| 424 | if (v != NULL) { |
| 425 | if ((err = fgets_intr(getstringvalue(v), n+1, in)) != E_OK) { |
| 426 | err_input(err); |
| 427 | DECREF(v); |
| 428 | return NULL; |
| 429 | } |
| 430 | else { |
| 431 | n = strlen(getstringvalue(v)); |
| 432 | if (n > 0 && getstringvalue(v)[n-1] == '\n') |
| 433 | n--; |
| 434 | resizestring(&v, n); |
| 435 | } |
| 436 | } |
| 437 | return v; |
| 438 | } |
| 439 | |
| 440 | static object * |
| 441 | builtin_reload(self, v) |
| 442 | object *self; |
| 443 | object *v; |
| 444 | { |
| 445 | return reload_module(v); |
| 446 | } |
| 447 | |
| 448 | static object * |
| 449 | builtin_type(self, v) |
| 450 | object *self; |
| 451 | object *v; |
| 452 | { |
| 453 | if (v == NULL) { |
| 454 | err_setstr(TypeError, "type() requres an argument"); |
| 455 | return NULL; |
| 456 | } |
| 457 | v = (object *)v->ob_type; |
| 458 | INCREF(v); |
| 459 | return v; |
| 460 | } |
| 461 | |
| 462 | static struct methodlist builtin_methods[] = { |
| 463 | {"abs", builtin_abs}, |
| 464 | {"chr", builtin_chr}, |
| 465 | {"dir", builtin_dir}, |
| 466 | {"divmod", builtin_divmod}, |
| 467 | {"eval", builtin_eval}, |
| 468 | {"exec", builtin_exec}, |
| 469 | {"float", builtin_float}, |
| 470 | {"input", builtin_input}, |
| 471 | {"int", builtin_int}, |
| 472 | {"len", builtin_len}, |
| 473 | {"min", builtin_min}, |
| 474 | {"max", builtin_max}, |
| 475 | {"open", builtin_open}, /* XXX move to OS module */ |
| 476 | {"ord", builtin_ord}, |
| 477 | {"range", builtin_range}, |
| 478 | {"raw_input", builtin_raw_input}, |
| 479 | {"reload", builtin_reload}, |
| 480 | {"type", builtin_type}, |
| 481 | {NULL, NULL}, |
| 482 | }; |
| 483 | |
| 484 | static object *builtin_dict; |
| 485 | |
| 486 | object * |
| 487 | getbuiltin(name) |
| 488 | char *name; |
| 489 | { |
| 490 | return dictlookup(builtin_dict, name); |
| 491 | } |
| 492 | |
| 493 | /* Predefined exceptions */ |
| 494 | |
| 495 | object *RuntimeError; |
| 496 | object *EOFError; |
| 497 | object *TypeError; |
| 498 | object *MemoryError; |
| 499 | object *NameError; |
| 500 | object *SystemError; |
| 501 | object *KeyboardInterrupt; |
| 502 | |
| 503 | static object * |
| 504 | newstdexception(name, message) |
| 505 | char *name, *message; |
| 506 | { |
| 507 | object *v = newstringobject(message); |
| 508 | if (v == NULL || dictinsert(builtin_dict, name, v) != 0) |
| 509 | fatal("no mem for new standard exception"); |
| 510 | return v; |
| 511 | } |
| 512 | |
| 513 | static void |
| 514 | initerrors() |
| 515 | { |
| 516 | RuntimeError = newstdexception("RuntimeError", "run-time error"); |
| 517 | EOFError = newstdexception("EOFError", "end-of-file read"); |
| 518 | TypeError = newstdexception("TypeError", "type error"); |
| 519 | MemoryError = newstdexception("MemoryError", "out of memory"); |
| 520 | NameError = newstdexception("NameError", "undefined name"); |
| 521 | SystemError = newstdexception("SystemError", "system error"); |
| 522 | KeyboardInterrupt = |
| 523 | newstdexception("KeyboardInterrupt", "keyboard interrupt"); |
| 524 | } |
| 525 | |
| 526 | void |
| 527 | initbuiltin() |
| 528 | { |
| 529 | object *m; |
| 530 | m = initmodule("builtin", builtin_methods); |
| 531 | builtin_dict = getmoduledict(m); |
| 532 | INCREF(builtin_dict); |
| 533 | initerrors(); |
| 534 | (void) dictinsert(builtin_dict, "None", None); |
| 535 | } |