1 /* vi:set ts=8 sts=4 sw=4 noet: 2 * 3 * VIM - Vi IMproved by Bram Moolenaar 4 * 5 * Do ":help uganda" in Vim to read copying and usage conditions. 6 * Do ":help credits" in Vim to see a list of people who contributed. 7 * See README.txt for an overview of the Vim source code. 8 */ 9 10 /* 11 * vim9type.c: handling of types 12 */ 13 14 #define USING_FLOAT_STUFF 15 #include "vim.h" 16 17 #if defined(FEAT_EVAL) || defined(PROTO) 18 19 #ifdef VMS 20 # include <float.h> 21 #endif 22 23 /* 24 * Allocate memory for a type_T and add the pointer to type_gap, so that it can 25 * be easily freed later. 26 */ 27 type_T * 28 get_type_ptr(garray_T *type_gap) 29 { 30 type_T *type; 31 32 if (ga_grow(type_gap, 1) == FAIL) 33 return NULL; 34 type = ALLOC_CLEAR_ONE(type_T); 35 if (type != NULL) 36 { 37 ((type_T **)type_gap->ga_data)[type_gap->ga_len] = type; 38 ++type_gap->ga_len; 39 } 40 return type; 41 } 42 43 void 44 clear_type_list(garray_T *gap) 45 { 46 while (gap->ga_len > 0) 47 vim_free(((type_T **)gap->ga_data)[--gap->ga_len]); 48 ga_clear(gap); 49 } 50 51 /* 52 * Take a type that is using entries in a growarray and turn it into a type 53 * with allocated entries. 54 */ 55 type_T * 56 alloc_type(type_T *type) 57 { 58 type_T *ret; 59 60 if (type == NULL) 61 return NULL; 62 63 // A fixed type never contains allocated types, return as-is. 64 if (type->tt_flags & TTFLAG_STATIC) 65 return type; 66 67 ret = ALLOC_ONE(type_T); 68 *ret = *type; 69 70 if (ret->tt_member != NULL) 71 ret->tt_member = alloc_type(ret->tt_member); 72 if (type->tt_args != NULL) 73 { 74 int i; 75 76 ret->tt_args = ALLOC_MULT(type_T *, type->tt_argcount); 77 if (ret->tt_args != NULL) 78 for (i = 0; i < type->tt_argcount; ++i) 79 ret->tt_args[i] = alloc_type(type->tt_args[i]); 80 } 81 82 return ret; 83 } 84 85 /* 86 * Free a type that was created with alloc_type(). 87 */ 88 void 89 free_type(type_T *type) 90 { 91 int i; 92 93 if (type == NULL || (type->tt_flags & TTFLAG_STATIC)) 94 return; 95 if (type->tt_args != NULL) 96 { 97 for (i = 0; i < type->tt_argcount; ++i) 98 free_type(type->tt_args[i]); 99 vim_free(type->tt_args); 100 } 101 free_type(type->tt_member); 102 vim_free(type); 103 } 104 105 type_T * 106 get_list_type(type_T *member_type, garray_T *type_gap) 107 { 108 type_T *type; 109 110 // recognize commonly used types 111 if (member_type == NULL || member_type->tt_type == VAR_ANY) 112 return &t_list_any; 113 if (member_type->tt_type == VAR_VOID 114 || member_type->tt_type == VAR_UNKNOWN) 115 return &t_list_empty; 116 if (member_type->tt_type == VAR_BOOL) 117 return &t_list_bool; 118 if (member_type->tt_type == VAR_NUMBER) 119 return &t_list_number; 120 if (member_type->tt_type == VAR_STRING) 121 return &t_list_string; 122 123 // Not a common type, create a new entry. 124 type = get_type_ptr(type_gap); 125 if (type == NULL) 126 return &t_any; 127 type->tt_type = VAR_LIST; 128 type->tt_member = member_type; 129 type->tt_argcount = 0; 130 type->tt_args = NULL; 131 return type; 132 } 133 134 type_T * 135 get_dict_type(type_T *member_type, garray_T *type_gap) 136 { 137 type_T *type; 138 139 // recognize commonly used types 140 if (member_type == NULL || member_type->tt_type == VAR_ANY) 141 return &t_dict_any; 142 if (member_type->tt_type == VAR_VOID 143 || member_type->tt_type == VAR_UNKNOWN) 144 return &t_dict_empty; 145 if (member_type->tt_type == VAR_BOOL) 146 return &t_dict_bool; 147 if (member_type->tt_type == VAR_NUMBER) 148 return &t_dict_number; 149 if (member_type->tt_type == VAR_STRING) 150 return &t_dict_string; 151 152 // Not a common type, create a new entry. 153 type = get_type_ptr(type_gap); 154 if (type == NULL) 155 return &t_any; 156 type->tt_type = VAR_DICT; 157 type->tt_member = member_type; 158 type->tt_argcount = 0; 159 type->tt_args = NULL; 160 return type; 161 } 162 163 /* 164 * Allocate a new type for a function. 165 */ 166 type_T * 167 alloc_func_type(type_T *ret_type, int argcount, garray_T *type_gap) 168 { 169 type_T *type = get_type_ptr(type_gap); 170 171 if (type == NULL) 172 return &t_any; 173 type->tt_type = VAR_FUNC; 174 type->tt_member = ret_type == NULL ? &t_unknown : ret_type; 175 type->tt_argcount = argcount; 176 type->tt_args = NULL; 177 return type; 178 } 179 180 /* 181 * Get a function type, based on the return type "ret_type". 182 * If "argcount" is -1 or 0 a predefined type can be used. 183 * If "argcount" > 0 always create a new type, so that arguments can be added. 184 */ 185 type_T * 186 get_func_type(type_T *ret_type, int argcount, garray_T *type_gap) 187 { 188 // recognize commonly used types 189 if (argcount <= 0) 190 { 191 if (ret_type == &t_unknown || ret_type == NULL) 192 { 193 // (argcount == 0) is not possible 194 return &t_func_unknown; 195 } 196 if (ret_type == &t_void) 197 { 198 if (argcount == 0) 199 return &t_func_0_void; 200 else 201 return &t_func_void; 202 } 203 if (ret_type == &t_any) 204 { 205 if (argcount == 0) 206 return &t_func_0_any; 207 else 208 return &t_func_any; 209 } 210 if (ret_type == &t_number) 211 { 212 if (argcount == 0) 213 return &t_func_0_number; 214 else 215 return &t_func_number; 216 } 217 if (ret_type == &t_string) 218 { 219 if (argcount == 0) 220 return &t_func_0_string; 221 else 222 return &t_func_string; 223 } 224 } 225 226 return alloc_func_type(ret_type, argcount, type_gap); 227 } 228 229 /* 230 * For a function type, reserve space for "argcount" argument types (including 231 * vararg). 232 */ 233 int 234 func_type_add_arg_types( 235 type_T *functype, 236 int argcount, 237 garray_T *type_gap) 238 { 239 // To make it easy to free the space needed for the argument types, add the 240 // pointer to type_gap. 241 if (ga_grow(type_gap, 1) == FAIL) 242 return FAIL; 243 functype->tt_args = ALLOC_CLEAR_MULT(type_T *, argcount); 244 if (functype->tt_args == NULL) 245 return FAIL; 246 ((type_T **)type_gap->ga_data)[type_gap->ga_len] = 247 (void *)functype->tt_args; 248 ++type_gap->ga_len; 249 return OK; 250 } 251 252 /* 253 * Get a type_T for a typval_T. 254 * "type_gap" is used to temporarily create types in. 255 * When "do_member" is TRUE also get the member type, otherwise use "any". 256 */ 257 static type_T * 258 typval2type_int(typval_T *tv, int copyID, garray_T *type_gap, int do_member) 259 { 260 type_T *type; 261 type_T *member_type = &t_any; 262 int argcount = 0; 263 int min_argcount = 0; 264 265 if (tv->v_type == VAR_NUMBER) 266 return &t_number; 267 if (tv->v_type == VAR_BOOL) 268 return &t_bool; 269 if (tv->v_type == VAR_STRING) 270 return &t_string; 271 272 if (tv->v_type == VAR_LIST) 273 { 274 list_T *l = tv->vval.v_list; 275 listitem_T *li; 276 277 if (l == NULL || l->lv_first == NULL) 278 return &t_list_empty; 279 if (!do_member) 280 return &t_list_any; 281 if (l->lv_first == &range_list_item) 282 return &t_list_number; 283 if (l->lv_copyID == copyID) 284 // avoid recursion 285 return &t_list_any; 286 l->lv_copyID = copyID; 287 288 // Use the common type of all members. 289 member_type = typval2type(&l->lv_first->li_tv, copyID, type_gap, TRUE); 290 for (li = l->lv_first->li_next; li != NULL; li = li->li_next) 291 common_type(typval2type(&li->li_tv, copyID, type_gap, TRUE), 292 member_type, &member_type, type_gap); 293 return get_list_type(member_type, type_gap); 294 } 295 296 if (tv->v_type == VAR_DICT) 297 { 298 dict_iterator_T iter; 299 typval_T *value; 300 dict_T *d = tv->vval.v_dict; 301 302 if (d == NULL || d->dv_hashtab.ht_used == 0) 303 return &t_dict_empty; 304 if (!do_member) 305 return &t_dict_any; 306 if (d->dv_copyID == copyID) 307 // avoid recursion 308 return &t_dict_any; 309 d->dv_copyID = copyID; 310 311 // Use the common type of all values. 312 dict_iterate_start(tv, &iter); 313 dict_iterate_next(&iter, &value); 314 member_type = typval2type(value, copyID, type_gap, TRUE); 315 while (dict_iterate_next(&iter, &value) != NULL) 316 common_type(typval2type(value, copyID, type_gap, TRUE), 317 member_type, &member_type, type_gap); 318 return get_dict_type(member_type, type_gap); 319 } 320 321 if (tv->v_type == VAR_FUNC || tv->v_type == VAR_PARTIAL) 322 { 323 char_u *name = NULL; 324 ufunc_T *ufunc = NULL; 325 326 if (tv->v_type == VAR_PARTIAL) 327 { 328 if (tv->vval.v_partial->pt_func != NULL) 329 ufunc = tv->vval.v_partial->pt_func; 330 else 331 name = tv->vval.v_partial->pt_name; 332 } 333 else 334 name = tv->vval.v_string; 335 if (name != NULL) 336 { 337 int idx = find_internal_func(name); 338 339 if (idx >= 0) 340 { 341 internal_func_get_argcount(idx, &argcount, &min_argcount); 342 member_type = internal_func_ret_type(idx, 0, NULL); 343 } 344 else 345 ufunc = find_func(name, FALSE, NULL); 346 } 347 if (ufunc != NULL) 348 { 349 // May need to get the argument types from default values by 350 // compiling the function. 351 if (ufunc->uf_def_status == UF_TO_BE_COMPILED 352 && compile_def_function(ufunc, TRUE, CT_NONE, NULL) 353 == FAIL) 354 return NULL; 355 if (ufunc->uf_func_type == NULL) 356 set_function_type(ufunc); 357 if (ufunc->uf_func_type != NULL) 358 { 359 if (tv->v_type == VAR_PARTIAL 360 && tv->vval.v_partial->pt_argc > 0) 361 { 362 type = get_type_ptr(type_gap); 363 if (type == NULL) 364 return NULL; 365 *type = *ufunc->uf_func_type; 366 type->tt_argcount -= tv->vval.v_partial->pt_argc; 367 type->tt_min_argcount -= tv->vval.v_partial->pt_argc; 368 return type; 369 } 370 return ufunc->uf_func_type; 371 } 372 } 373 } 374 375 type = get_type_ptr(type_gap); 376 if (type == NULL) 377 return NULL; 378 type->tt_type = tv->v_type; 379 type->tt_argcount = argcount; 380 type->tt_min_argcount = min_argcount; 381 type->tt_member = member_type; 382 383 return type; 384 } 385 386 /* 387 * Return TRUE if "tv" is not a bool but should be converted to bool. 388 */ 389 int 390 need_convert_to_bool(type_T *type, typval_T *tv) 391 { 392 return type != NULL && type == &t_bool && tv->v_type != VAR_BOOL 393 && (tv->v_type == VAR_NUMBER 394 && (tv->vval.v_number == 0 || tv->vval.v_number == 1)); 395 } 396 397 /* 398 * Get a type_T for a typval_T. 399 * "type_list" is used to temporarily create types in. 400 * When "do_member" is TRUE also get the member type, otherwise use "any". 401 */ 402 type_T * 403 typval2type(typval_T *tv, int copyID, garray_T *type_gap, int do_member) 404 { 405 type_T *type = typval2type_int(tv, copyID, type_gap, do_member); 406 407 if (type != NULL && type != &t_bool 408 && (tv->v_type == VAR_NUMBER 409 && (tv->vval.v_number == 0 || tv->vval.v_number == 1))) 410 // Number 0 and 1 and expression with "&&" or "||" can also be used for 411 // bool. 412 type = &t_number_bool; 413 return type; 414 } 415 416 /* 417 * Get a type_T for a typval_T, used for v: variables. 418 * "type_list" is used to temporarily create types in. 419 */ 420 type_T * 421 typval2type_vimvar(typval_T *tv, garray_T *type_gap) 422 { 423 if (tv->v_type == VAR_LIST) // e.g. for v:oldfiles 424 return &t_list_string; 425 if (tv->v_type == VAR_DICT) // e.g. for v:completed_item 426 return &t_dict_any; 427 return typval2type(tv, get_copyID(), type_gap, TRUE); 428 } 429 430 int 431 check_typval_arg_type( 432 type_T *expected, 433 typval_T *actual_tv, 434 char *func_name, 435 int arg_idx) 436 { 437 where_T where = WHERE_INIT; 438 439 where.wt_index = arg_idx; 440 where.wt_func_name = func_name; 441 return check_typval_type(expected, actual_tv, where); 442 } 443 444 /* 445 * Return FAIL if "expected" and "actual" don't match. 446 * When "argidx" > 0 it is included in the error message. 447 */ 448 int 449 check_typval_type(type_T *expected, typval_T *actual_tv, where_T where) 450 { 451 garray_T type_list; 452 type_T *actual_type; 453 int res = FAIL; 454 455 ga_init2(&type_list, sizeof(type_T *), 10); 456 actual_type = typval2type(actual_tv, get_copyID(), &type_list, TRUE); 457 if (actual_type != NULL) 458 res = check_type(expected, actual_type, TRUE, where); 459 clear_type_list(&type_list); 460 return res; 461 } 462 463 void 464 type_mismatch(type_T *expected, type_T *actual) 465 { 466 arg_type_mismatch(expected, actual, 0); 467 } 468 469 void 470 arg_type_mismatch(type_T *expected, type_T *actual, int arg_idx) 471 { 472 where_T where = WHERE_INIT; 473 474 where.wt_index = arg_idx; 475 type_mismatch_where(expected, actual, where); 476 } 477 478 void 479 type_mismatch_where(type_T *expected, type_T *actual, where_T where) 480 { 481 char *tofree1, *tofree2; 482 char *typename1 = type_name(expected, &tofree1); 483 char *typename2 = type_name(actual, &tofree2); 484 485 if (where.wt_index > 0) 486 { 487 if (where.wt_func_name == NULL) 488 semsg(_(where.wt_variable 489 ? e_variable_nr_type_mismatch_expected_str_but_got_str 490 : e_argument_nr_type_mismatch_expected_str_but_got_str), 491 where.wt_index, typename1, typename2); 492 else 493 semsg(_(where.wt_variable 494 ? e_variable_nr_type_mismatch_expected_str_but_got_str_in_str 495 : e_argument_nr_type_mismatch_expected_str_but_got_str_in_str), 496 where.wt_index, typename1, typename2, where.wt_func_name); 497 } 498 else if (where.wt_func_name == NULL) 499 semsg(_(e_type_mismatch_expected_str_but_got_str), 500 typename1, typename2); 501 else 502 semsg(_(e_type_mismatch_expected_str_but_got_str_in_str), 503 typename1, typename2, where.wt_func_name); 504 vim_free(tofree1); 505 vim_free(tofree2); 506 } 507 508 /* 509 * Check if the expected and actual types match. 510 * Does not allow for assigning "any" to a specific type. 511 * When "argidx" > 0 it is included in the error message. 512 */ 513 int 514 check_type(type_T *expected, type_T *actual, int give_msg, where_T where) 515 { 516 int ret = OK; 517 518 // When expected is "unknown" we accept any actual type. 519 // When expected is "any" we accept any actual type except "void". 520 if (expected->tt_type != VAR_UNKNOWN 521 && !(expected->tt_type == VAR_ANY && actual->tt_type != VAR_VOID)) 522 523 { 524 // tt_type should match, except that a "partial" can be assigned to a 525 // variable with type "func". 526 if (!(expected->tt_type == actual->tt_type 527 || (expected->tt_type == VAR_FUNC 528 && actual->tt_type == VAR_PARTIAL))) 529 { 530 if (expected->tt_type == VAR_BOOL 531 && (actual->tt_flags & TTFLAG_BOOL_OK)) 532 // Using number 0 or 1 for bool is OK. 533 return OK; 534 if (give_msg) 535 type_mismatch_where(expected, actual, where); 536 return FAIL; 537 } 538 if (expected->tt_type == VAR_DICT || expected->tt_type == VAR_LIST) 539 { 540 // "unknown" is used for an empty list or dict 541 if (actual->tt_member != &t_unknown) 542 ret = check_type(expected->tt_member, actual->tt_member, 543 FALSE, where); 544 } 545 else if (expected->tt_type == VAR_FUNC) 546 { 547 // If the return type is unknown it can be anything, including 548 // nothing, thus there is no point in checking. 549 if (expected->tt_member != &t_unknown 550 && actual->tt_member != &t_unknown) 551 ret = check_type(expected->tt_member, actual->tt_member, 552 FALSE, where); 553 if (ret == OK && expected->tt_argcount != -1 554 && actual->tt_min_argcount != -1 555 && (actual->tt_argcount == -1 556 || (actual->tt_argcount < expected->tt_min_argcount 557 || actual->tt_argcount > expected->tt_argcount))) 558 ret = FAIL; 559 if (ret == OK && expected->tt_args != NULL 560 && actual->tt_args != NULL) 561 { 562 int i; 563 564 for (i = 0; i < expected->tt_argcount; ++i) 565 // Allow for using "any" argument type, lambda's have them. 566 if (actual->tt_args[i] != &t_any && check_type( 567 expected->tt_args[i], actual->tt_args[i], FALSE, 568 where) == FAIL) 569 { 570 ret = FAIL; 571 break; 572 } 573 } 574 } 575 if (ret == FAIL && give_msg) 576 type_mismatch_where(expected, actual, where); 577 } 578 return ret; 579 } 580 581 /* 582 * Check that the arguments of "type" match "argvars[argcount]". 583 * Return OK/FAIL. 584 */ 585 int 586 check_argument_types( 587 type_T *type, 588 typval_T *argvars, 589 int argcount, 590 char_u *name) 591 { 592 int varargs = (type->tt_flags & TTFLAG_VARARGS) ? 1 : 0; 593 int i; 594 595 if (type->tt_type != VAR_FUNC && type->tt_type != VAR_PARTIAL) 596 return OK; // just in case 597 if (argcount < type->tt_min_argcount - varargs) 598 { 599 semsg(_(e_toofewarg), name); 600 return FAIL; 601 } 602 if (!varargs && type->tt_argcount >= 0 && argcount > type->tt_argcount) 603 { 604 semsg(_(e_toomanyarg), name); 605 return FAIL; 606 } 607 if (type->tt_args == NULL) 608 return OK; // cannot check 609 610 611 for (i = 0; i < argcount; ++i) 612 { 613 type_T *expected; 614 615 if (varargs && i >= type->tt_argcount - 1) 616 expected = type->tt_args[type->tt_argcount - 1]->tt_member; 617 else 618 expected = type->tt_args[i]; 619 if (check_typval_arg_type(expected, &argvars[i], NULL, i + 1) == FAIL) 620 return FAIL; 621 } 622 return OK; 623 } 624 625 /* 626 * Skip over a type definition and return a pointer to just after it. 627 * When "optional" is TRUE then a leading "?" is accepted. 628 */ 629 char_u * 630 skip_type(char_u *start, int optional) 631 { 632 char_u *p = start; 633 634 if (optional && *p == '?') 635 ++p; 636 while (ASCII_ISALNUM(*p) || *p == '_') 637 ++p; 638 639 // Skip over "<type>"; this is permissive about white space. 640 if (*skipwhite(p) == '<') 641 { 642 p = skipwhite(p); 643 p = skip_type(skipwhite(p + 1), FALSE); 644 p = skipwhite(p); 645 if (*p == '>') 646 ++p; 647 } 648 else if ((*p == '(' || (*p == ':' && VIM_ISWHITE(p[1]))) 649 && STRNCMP("func", start, 4) == 0) 650 { 651 if (*p == '(') 652 { 653 // handle func(args): type 654 ++p; 655 while (*p != ')' && *p != NUL) 656 { 657 char_u *sp = p; 658 659 if (STRNCMP(p, "...", 3) == 0) 660 p += 3; 661 p = skip_type(p, TRUE); 662 if (p == sp) 663 return p; // syntax error 664 if (*p == ',') 665 p = skipwhite(p + 1); 666 } 667 if (*p == ')') 668 { 669 if (p[1] == ':') 670 p = skip_type(skipwhite(p + 2), FALSE); 671 else 672 ++p; 673 } 674 } 675 else 676 { 677 // handle func: return_type 678 p = skip_type(skipwhite(p + 1), FALSE); 679 } 680 } 681 682 return p; 683 } 684 685 /* 686 * Parse the member type: "<type>" and return "type" with the member set. 687 * Use "type_gap" if a new type needs to be added. 688 * Returns NULL in case of failure. 689 */ 690 static type_T * 691 parse_type_member( 692 char_u **arg, 693 type_T *type, 694 garray_T *type_gap, 695 int give_error) 696 { 697 type_T *member_type; 698 int prev_called_emsg = called_emsg; 699 700 if (**arg != '<') 701 { 702 if (give_error) 703 { 704 if (*skipwhite(*arg) == '<') 705 semsg(_(e_no_white_space_allowed_before_str_str), "<", *arg); 706 else 707 emsg(_(e_missing_type)); 708 } 709 return NULL; 710 } 711 *arg = skipwhite(*arg + 1); 712 713 member_type = parse_type(arg, type_gap, give_error); 714 if (member_type == NULL) 715 return NULL; 716 717 *arg = skipwhite(*arg); 718 if (**arg != '>' && called_emsg == prev_called_emsg) 719 { 720 if (give_error) 721 emsg(_(e_missing_gt_after_type)); 722 return NULL; 723 } 724 ++*arg; 725 726 if (type->tt_type == VAR_LIST) 727 return get_list_type(member_type, type_gap); 728 return get_dict_type(member_type, type_gap); 729 } 730 731 /* 732 * Parse a type at "arg" and advance over it. 733 * When "give_error" is TRUE give error messages, otherwise be quiet. 734 * Return NULL for failure. 735 */ 736 type_T * 737 parse_type(char_u **arg, garray_T *type_gap, int give_error) 738 { 739 char_u *p = *arg; 740 size_t len; 741 742 // skip over the first word 743 while (ASCII_ISALNUM(*p) || *p == '_') 744 ++p; 745 len = p - *arg; 746 747 switch (**arg) 748 { 749 case 'a': 750 if (len == 3 && STRNCMP(*arg, "any", len) == 0) 751 { 752 *arg += len; 753 return &t_any; 754 } 755 break; 756 case 'b': 757 if (len == 4 && STRNCMP(*arg, "bool", len) == 0) 758 { 759 *arg += len; 760 return &t_bool; 761 } 762 if (len == 4 && STRNCMP(*arg, "blob", len) == 0) 763 { 764 *arg += len; 765 return &t_blob; 766 } 767 break; 768 case 'c': 769 if (len == 7 && STRNCMP(*arg, "channel", len) == 0) 770 { 771 *arg += len; 772 return &t_channel; 773 } 774 break; 775 case 'd': 776 if (len == 4 && STRNCMP(*arg, "dict", len) == 0) 777 { 778 *arg += len; 779 return parse_type_member(arg, &t_dict_any, 780 type_gap, give_error); 781 } 782 break; 783 case 'f': 784 if (len == 5 && STRNCMP(*arg, "float", len) == 0) 785 { 786 #ifdef FEAT_FLOAT 787 *arg += len; 788 return &t_float; 789 #else 790 if (give_error) 791 emsg(_(e_this_vim_is_not_compiled_with_float_support)); 792 return NULL; 793 #endif 794 } 795 if (len == 4 && STRNCMP(*arg, "func", len) == 0) 796 { 797 type_T *type; 798 type_T *ret_type = &t_unknown; 799 int argcount = -1; 800 int flags = 0; 801 int first_optional = -1; 802 type_T *arg_type[MAX_FUNC_ARGS + 1]; 803 804 // func({type}, ...{type}): {type} 805 *arg += len; 806 if (**arg == '(') 807 { 808 // "func" may or may not return a value, "func()" does 809 // not return a value. 810 ret_type = &t_void; 811 812 p = ++*arg; 813 argcount = 0; 814 while (*p != NUL && *p != ')') 815 { 816 if (*p == '?') 817 { 818 if (first_optional == -1) 819 first_optional = argcount; 820 ++p; 821 } 822 else if (STRNCMP(p, "...", 3) == 0) 823 { 824 flags |= TTFLAG_VARARGS; 825 p += 3; 826 } 827 else if (first_optional != -1) 828 { 829 if (give_error) 830 emsg(_(e_mandatory_argument_after_optional_argument)); 831 return NULL; 832 } 833 834 type = parse_type(&p, type_gap, give_error); 835 if (type == NULL) 836 return NULL; 837 arg_type[argcount++] = type; 838 839 // Nothing comes after "...{type}". 840 if (flags & TTFLAG_VARARGS) 841 break; 842 843 if (*p != ',' && *skipwhite(p) == ',') 844 { 845 if (give_error) 846 semsg(_(e_no_white_space_allowed_before_str_str), 847 ",", p); 848 return NULL; 849 } 850 if (*p == ',') 851 { 852 ++p; 853 if (!VIM_ISWHITE(*p)) 854 { 855 if (give_error) 856 semsg(_(e_white_space_required_after_str_str), 857 ",", p - 1); 858 return NULL; 859 } 860 } 861 p = skipwhite(p); 862 if (argcount == MAX_FUNC_ARGS) 863 { 864 if (give_error) 865 emsg(_(e_too_many_argument_types)); 866 return NULL; 867 } 868 } 869 870 p = skipwhite(p); 871 if (*p != ')') 872 { 873 if (give_error) 874 emsg(_(e_missing_close)); 875 return NULL; 876 } 877 *arg = p + 1; 878 } 879 if (**arg == ':') 880 { 881 // parse return type 882 ++*arg; 883 if (!VIM_ISWHITE(**arg) && give_error) 884 semsg(_(e_white_space_required_after_str_str), 885 ":", *arg - 1); 886 *arg = skipwhite(*arg); 887 ret_type = parse_type(arg, type_gap, give_error); 888 if (ret_type == NULL) 889 return NULL; 890 } 891 if (flags == 0 && first_optional == -1 && argcount <= 0) 892 type = get_func_type(ret_type, argcount, type_gap); 893 else 894 { 895 type = alloc_func_type(ret_type, argcount, type_gap); 896 type->tt_flags = flags; 897 if (argcount > 0) 898 { 899 type->tt_argcount = argcount; 900 type->tt_min_argcount = first_optional == -1 901 ? argcount : first_optional; 902 if (func_type_add_arg_types(type, argcount, 903 type_gap) == FAIL) 904 return NULL; 905 mch_memmove(type->tt_args, arg_type, 906 sizeof(type_T *) * argcount); 907 } 908 } 909 return type; 910 } 911 break; 912 case 'j': 913 if (len == 3 && STRNCMP(*arg, "job", len) == 0) 914 { 915 *arg += len; 916 return &t_job; 917 } 918 break; 919 case 'l': 920 if (len == 4 && STRNCMP(*arg, "list", len) == 0) 921 { 922 *arg += len; 923 return parse_type_member(arg, &t_list_any, 924 type_gap, give_error); 925 } 926 break; 927 case 'n': 928 if (len == 6 && STRNCMP(*arg, "number", len) == 0) 929 { 930 *arg += len; 931 return &t_number; 932 } 933 break; 934 case 's': 935 if (len == 6 && STRNCMP(*arg, "string", len) == 0) 936 { 937 *arg += len; 938 return &t_string; 939 } 940 break; 941 case 'v': 942 if (len == 4 && STRNCMP(*arg, "void", len) == 0) 943 { 944 *arg += len; 945 return &t_void; 946 } 947 break; 948 } 949 950 if (give_error) 951 semsg(_(e_type_not_recognized_str), *arg); 952 return NULL; 953 } 954 955 /* 956 * Check if "type1" and "type2" are exactly the same. 957 */ 958 int 959 equal_type(type_T *type1, type_T *type2) 960 { 961 int i; 962 963 if (type1 == NULL || type2 == NULL) 964 return FALSE; 965 if (type1->tt_type != type2->tt_type) 966 return FALSE; 967 switch (type1->tt_type) 968 { 969 case VAR_UNKNOWN: 970 case VAR_ANY: 971 case VAR_VOID: 972 case VAR_SPECIAL: 973 case VAR_BOOL: 974 case VAR_NUMBER: 975 case VAR_FLOAT: 976 case VAR_STRING: 977 case VAR_BLOB: 978 case VAR_JOB: 979 case VAR_CHANNEL: 980 case VAR_INSTR: 981 break; // not composite is always OK 982 case VAR_LIST: 983 case VAR_DICT: 984 return equal_type(type1->tt_member, type2->tt_member); 985 case VAR_FUNC: 986 case VAR_PARTIAL: 987 if (!equal_type(type1->tt_member, type2->tt_member) 988 || type1->tt_argcount != type2->tt_argcount) 989 return FALSE; 990 if (type1->tt_argcount < 0 991 || type1->tt_args == NULL || type2->tt_args == NULL) 992 return TRUE; 993 for (i = 0; i < type1->tt_argcount; ++i) 994 if (!equal_type(type1->tt_args[i], type2->tt_args[i])) 995 return FALSE; 996 return TRUE; 997 } 998 return TRUE; 999 } 1000 1001 /* 1002 * Find the common type of "type1" and "type2" and put it in "dest". 1003 * "type2" and "dest" may be the same. 1004 */ 1005 void 1006 common_type(type_T *type1, type_T *type2, type_T **dest, garray_T *type_gap) 1007 { 1008 if (equal_type(type1, type2)) 1009 { 1010 *dest = type1; 1011 return; 1012 } 1013 1014 // If either is VAR_UNKNOWN use the other type. An empty list/dict has no 1015 // specific type. 1016 if (type1 == NULL || type1->tt_type == VAR_UNKNOWN) 1017 { 1018 *dest = type2; 1019 return; 1020 } 1021 if (type2 == NULL || type2->tt_type == VAR_UNKNOWN) 1022 { 1023 *dest = type1; 1024 return; 1025 } 1026 1027 if (type1->tt_type == type2->tt_type) 1028 { 1029 if (type1->tt_type == VAR_LIST || type2->tt_type == VAR_DICT) 1030 { 1031 type_T *common; 1032 1033 common_type(type1->tt_member, type2->tt_member, &common, type_gap); 1034 if (type1->tt_type == VAR_LIST) 1035 *dest = get_list_type(common, type_gap); 1036 else 1037 *dest = get_dict_type(common, type_gap); 1038 return; 1039 } 1040 if (type1->tt_type == VAR_FUNC) 1041 { 1042 type_T *common; 1043 1044 common_type(type1->tt_member, type2->tt_member, &common, type_gap); 1045 if (type1->tt_argcount == type2->tt_argcount 1046 && type1->tt_argcount >= 0) 1047 { 1048 int argcount = type1->tt_argcount; 1049 int i; 1050 1051 *dest = alloc_func_type(common, argcount, type_gap); 1052 if (type1->tt_args != NULL && type2->tt_args != NULL) 1053 { 1054 if (func_type_add_arg_types(*dest, argcount, 1055 type_gap) == OK) 1056 for (i = 0; i < argcount; ++i) 1057 common_type(type1->tt_args[i], type2->tt_args[i], 1058 &(*dest)->tt_args[i], type_gap); 1059 } 1060 } 1061 else 1062 // Use -1 for "tt_argcount" to indicate an unknown number of 1063 // arguments. 1064 *dest = alloc_func_type(common, -1, type_gap); 1065 1066 // Use the minimum of min_argcount. 1067 (*dest)->tt_min_argcount = 1068 type1->tt_min_argcount < type2->tt_min_argcount 1069 ? type1->tt_min_argcount : type2->tt_min_argcount; 1070 return; 1071 } 1072 } 1073 1074 *dest = &t_any; 1075 } 1076 1077 /* 1078 * Get the member type of a dict or list from the items on the stack. 1079 * "stack_top" points just after the last type on the type stack. 1080 * For a list "skip" is 1, for a dict "skip" is 2, keys are skipped. 1081 * Returns &t_void for an empty list or dict. 1082 * Otherwise finds the common type of all items. 1083 */ 1084 type_T * 1085 get_member_type_from_stack( 1086 type_T **stack_top, 1087 int count, 1088 int skip, 1089 garray_T *type_gap) 1090 { 1091 int i; 1092 type_T *result; 1093 type_T *type; 1094 1095 // Use "any" for an empty list or dict. 1096 if (count == 0) 1097 return &t_unknown; 1098 1099 // Use the first value type for the list member type, then find the common 1100 // type from following items. 1101 result = *(stack_top -(count * skip) + skip - 1); 1102 for (i = 1; i < count; ++i) 1103 { 1104 if (result == &t_any) 1105 break; // won't get more common 1106 type = *(stack_top -((count - i) * skip) + skip - 1); 1107 common_type(type, result, &result, type_gap); 1108 } 1109 1110 return result; 1111 } 1112 1113 char * 1114 vartype_name(vartype_T type) 1115 { 1116 switch (type) 1117 { 1118 case VAR_UNKNOWN: break; 1119 case VAR_ANY: return "any"; 1120 case VAR_VOID: return "void"; 1121 case VAR_SPECIAL: return "special"; 1122 case VAR_BOOL: return "bool"; 1123 case VAR_NUMBER: return "number"; 1124 case VAR_FLOAT: return "float"; 1125 case VAR_STRING: return "string"; 1126 case VAR_BLOB: return "blob"; 1127 case VAR_JOB: return "job"; 1128 case VAR_CHANNEL: return "channel"; 1129 case VAR_LIST: return "list"; 1130 case VAR_DICT: return "dict"; 1131 case VAR_INSTR: return "instr"; 1132 1133 case VAR_FUNC: 1134 case VAR_PARTIAL: return "func"; 1135 } 1136 return "unknown"; 1137 } 1138 1139 /* 1140 * Return the name of a type. 1141 * The result may be in allocated memory, in which case "tofree" is set. 1142 */ 1143 char * 1144 type_name(type_T *type, char **tofree) 1145 { 1146 char *name; 1147 1148 *tofree = NULL; 1149 if (type == NULL) 1150 return "[unknown]"; 1151 name = vartype_name(type->tt_type); 1152 if (type->tt_type == VAR_LIST || type->tt_type == VAR_DICT) 1153 { 1154 char *member_free; 1155 char *member_name = type_name(type->tt_member, &member_free); 1156 size_t len; 1157 1158 len = STRLEN(name) + STRLEN(member_name) + 3; 1159 *tofree = alloc(len); 1160 if (*tofree != NULL) 1161 { 1162 vim_snprintf(*tofree, len, "%s<%s>", name, member_name); 1163 vim_free(member_free); 1164 return *tofree; 1165 } 1166 } 1167 if (type->tt_type == VAR_FUNC) 1168 { 1169 garray_T ga; 1170 int i; 1171 int varargs = (type->tt_flags & TTFLAG_VARARGS) ? 1 : 0; 1172 1173 ga_init2(&ga, 1, 100); 1174 if (ga_grow(&ga, 20) == FAIL) 1175 return "[unknown]"; 1176 STRCPY(ga.ga_data, "func("); 1177 ga.ga_len += 5; 1178 1179 for (i = 0; i < type->tt_argcount; ++i) 1180 { 1181 char *arg_free = NULL; 1182 char *arg_type; 1183 int len; 1184 1185 if (type->tt_args == NULL) 1186 arg_type = "[unknown]"; 1187 else 1188 arg_type = type_name(type->tt_args[i], &arg_free); 1189 if (i > 0) 1190 { 1191 STRCPY((char *)ga.ga_data + ga.ga_len, ", "); 1192 ga.ga_len += 2; 1193 } 1194 len = (int)STRLEN(arg_type); 1195 if (ga_grow(&ga, len + 8) == FAIL) 1196 { 1197 vim_free(arg_free); 1198 ga_clear(&ga); 1199 return "[unknown]"; 1200 } 1201 if (varargs && i == type->tt_argcount - 1) 1202 ga_concat(&ga, (char_u *)"..."); 1203 else if (i >= type->tt_min_argcount) 1204 *((char *)ga.ga_data + ga.ga_len++) = '?'; 1205 ga_concat(&ga, (char_u *)arg_type); 1206 vim_free(arg_free); 1207 } 1208 if (type->tt_argcount < 0) 1209 // any number of arguments 1210 ga_concat(&ga, (char_u *)"..."); 1211 1212 if (type->tt_member == &t_void) 1213 STRCPY((char *)ga.ga_data + ga.ga_len, ")"); 1214 else 1215 { 1216 char *ret_free; 1217 char *ret_name = type_name(type->tt_member, &ret_free); 1218 int len; 1219 1220 len = (int)STRLEN(ret_name) + 4; 1221 if (ga_grow(&ga, len) == FAIL) 1222 { 1223 vim_free(ret_free); 1224 ga_clear(&ga); 1225 return "[unknown]"; 1226 } 1227 STRCPY((char *)ga.ga_data + ga.ga_len, "): "); 1228 STRCPY((char *)ga.ga_data + ga.ga_len + 3, ret_name); 1229 vim_free(ret_free); 1230 } 1231 *tofree = ga.ga_data; 1232 return ga.ga_data; 1233 } 1234 1235 return name; 1236 } 1237 1238 /* 1239 * "typename(expr)" function 1240 */ 1241 void 1242 f_typename(typval_T *argvars, typval_T *rettv) 1243 { 1244 garray_T type_list; 1245 type_T *type; 1246 char *tofree; 1247 char *name; 1248 1249 rettv->v_type = VAR_STRING; 1250 ga_init2(&type_list, sizeof(type_T *), 10); 1251 type = typval2type(argvars, get_copyID(), &type_list, TRUE); 1252 name = type_name(type, &tofree); 1253 if (tofree != NULL) 1254 rettv->vval.v_string = (char_u *)tofree; 1255 else 1256 { 1257 rettv->vval.v_string = vim_strsave((char_u *)name); 1258 vim_free(tofree); 1259 } 1260 clear_type_list(&type_list); 1261 } 1262 1263 #endif // FEAT_EVAL 1264