diff options
Diffstat (limited to 'src/bootstrap/primitives.c')
-rw-r--r-- | src/bootstrap/primitives.c | 710 |
1 files changed, 0 insertions, 710 deletions
diff --git a/src/bootstrap/primitives.c b/src/bootstrap/primitives.c deleted file mode 100644 index 3c03b99..0000000 --- a/src/bootstrap/primitives.c +++ /dev/null | |||
@@ -1,710 +0,0 @@ | |||
1 | bool display(Object *root); | ||
2 | |||
3 | void | ||
4 | display_pair(Object *root) { | ||
5 | display(root->car); | ||
6 | if (root->cdr->type == OBJ_TYPE_PAIR) { | ||
7 | printf(" "); | ||
8 | display_pair(root->cdr); | ||
9 | } else if (root->cdr == obj_nil) { | ||
10 | return; | ||
11 | } else { | ||
12 | printf(" . "); | ||
13 | display(root->cdr); | ||
14 | } | ||
15 | } | ||
16 | |||
17 | bool | ||
18 | display(Object *root) { | ||
19 | if (root == NULL) { | ||
20 | return false; | ||
21 | } | ||
22 | |||
23 | switch (root->type) { | ||
24 | case OBJ_TYPE_FIXNUM: { | ||
25 | printf("%zd", root->fixnum); | ||
26 | } break; | ||
27 | case OBJ_TYPE_BOOL: { | ||
28 | if (root->boolean) { | ||
29 | printf("true"); | ||
30 | } else { | ||
31 | printf("false"); | ||
32 | } | ||
33 | } break; | ||
34 | case OBJ_TYPE_NIL: { | ||
35 | printf("()"); | ||
36 | } break; | ||
37 | case OBJ_TYPE_STRING: { | ||
38 | printf("\"%.*s\"", (int)root->string_n, root->string); | ||
39 | } break; | ||
40 | case OBJ_TYPE_SYMBOL: { | ||
41 | printf(":%.*s", (int)root->symbol_n, root->symbol); | ||
42 | } break; | ||
43 | case OBJ_TYPE_PAIR: { | ||
44 | printf("("); | ||
45 | display_pair(root); | ||
46 | printf(")"); | ||
47 | } break; | ||
48 | case OBJ_TYPE_PROCEDURE: { | ||
49 | printf("#{procedure}"); | ||
50 | } break; | ||
51 | } | ||
52 | return true; | ||
53 | } | ||
54 | |||
55 | Object * | ||
56 | eval(Object *root) { | ||
57 | switch (root->type) { | ||
58 | case OBJ_TYPE_FIXNUM: | ||
59 | case OBJ_TYPE_BOOL: | ||
60 | case OBJ_TYPE_NIL: | ||
61 | case OBJ_TYPE_STRING: { | ||
62 | return root; | ||
63 | } break; | ||
64 | case OBJ_TYPE_SYMBOL: { | ||
65 | Object *value = env_find_symbol(root); | ||
66 | if (value == NULL) { | ||
67 | printf("error: symbol not found: `"); | ||
68 | display(root); | ||
69 | printf("`\n"); | ||
70 | return obj_nil; | ||
71 | } | ||
72 | return value; | ||
73 | } break; | ||
74 | case OBJ_TYPE_PAIR: { | ||
75 | if (root->car->type == OBJ_TYPE_SYMBOL) { | ||
76 | Object *value = env_find_symbol(root->car); | ||
77 | if (value == NULL) { | ||
78 | printf("error: symbol not found: `"); | ||
79 | display(root->car); | ||
80 | printf("`\n"); | ||
81 | return obj_nil; | ||
82 | } | ||
83 | if (value->type == OBJ_TYPE_PROCEDURE) { | ||
84 | return value->proc(root->cdr); | ||
85 | } | ||
86 | } | ||
87 | } break; | ||
88 | default: { | ||
89 | printf("error: can't eval type %d.\n", root->type); | ||
90 | } break; | ||
91 | } | ||
92 | return obj_nil; | ||
93 | } | ||
94 | |||
95 | // | ||
96 | // Arithmetic procedures. | ||
97 | // | ||
98 | |||
99 | Object * | ||
100 | proc_add(Object *args) { | ||
101 | // Extract first parameter. | ||
102 | Object *car = eval(args->car); | ||
103 | if (car == NULL) { | ||
104 | fprintf(stderr, "error: not enough arguments\n"); | ||
105 | return obj_nil; | ||
106 | } | ||
107 | if (car->type != OBJ_TYPE_FIXNUM) { | ||
108 | fprintf(stderr, "addition not supported for type %d\n", car->type); | ||
109 | return obj_nil; | ||
110 | } | ||
111 | args = args->cdr; | ||
112 | ssize_t tot = car->fixnum; | ||
113 | |||
114 | while (args->type == OBJ_TYPE_PAIR) { | ||
115 | Object *car = eval(args->car); | ||
116 | if (car == NULL) { | ||
117 | car = obj_nil; | ||
118 | } | ||
119 | if (car->type != OBJ_TYPE_FIXNUM) { | ||
120 | fprintf(stderr, "addition not supported for type %d\n", car->type); | ||
121 | return obj_nil; | ||
122 | } | ||
123 | tot += car->fixnum; | ||
124 | args = args->cdr; | ||
125 | } | ||
126 | return make_fixnum(tot); | ||
127 | } | ||
128 | |||
129 | Object * | ||
130 | proc_sub(Object *args) { | ||
131 | // Extract first parameter. | ||
132 | Object *car = eval(args->car); | ||
133 | if (car == NULL) { | ||
134 | fprintf(stderr, "error: not enough arguments\n"); | ||
135 | return obj_nil; | ||
136 | } | ||
137 | if (car->type != OBJ_TYPE_FIXNUM) { | ||
138 | fprintf(stderr, "error: sub not supported for type %d\n", car->type); | ||
139 | return obj_nil; | ||
140 | } | ||
141 | args = args->cdr; | ||
142 | ssize_t tot = car->fixnum; | ||
143 | |||
144 | while (args->type == OBJ_TYPE_PAIR) { | ||
145 | car = eval(args->car); | ||
146 | if (car == NULL) { | ||
147 | car = obj_nil; | ||
148 | } | ||
149 | if (car->type != OBJ_TYPE_FIXNUM) { | ||
150 | fprintf(stderr, "error: sub not supported for type %d\n", car->type); | ||
151 | return obj_nil; | ||
152 | } | ||
153 | tot -= car->fixnum; | ||
154 | args = args->cdr; | ||
155 | } | ||
156 | return make_fixnum(tot); | ||
157 | } | ||
158 | |||
159 | Object * | ||
160 | proc_mul(Object *args) { | ||
161 | // Extract first parameter. | ||
162 | Object *car = eval(args->car); | ||
163 | if (car == NULL) { | ||
164 | fprintf(stderr, "error: not enough arguments\n"); | ||
165 | return obj_nil; | ||
166 | } | ||
167 | if (car->type != OBJ_TYPE_FIXNUM) { | ||
168 | fprintf(stderr, "error: mult not supported for type %d\n", car->type); | ||
169 | return obj_nil; | ||
170 | } | ||
171 | args = args->cdr; | ||
172 | ssize_t tot = car->fixnum; | ||
173 | |||
174 | while (args->type == OBJ_TYPE_PAIR) { | ||
175 | Object *car = eval(args->car); | ||
176 | if (car == NULL) { | ||
177 | car = obj_nil; | ||
178 | } | ||
179 | if (car->type != OBJ_TYPE_FIXNUM) { | ||
180 | fprintf(stderr, "error: mult not supported for type %d\n", car->type); | ||
181 | return obj_nil; | ||
182 | } | ||
183 | tot *= car->fixnum; | ||
184 | args = args->cdr; | ||
185 | } | ||
186 | return make_fixnum(tot); | ||
187 | } | ||
188 | |||
189 | Object * | ||
190 | proc_div(Object *args) { | ||
191 | // Extract first parameter. | ||
192 | Object *car = eval(args->car); | ||
193 | if (car == NULL) { | ||
194 | fprintf(stderr, "error: not enough arguments\n"); | ||
195 | return obj_nil; | ||
196 | } | ||
197 | args = args->cdr; | ||
198 | ssize_t tot = car->fixnum; | ||
199 | |||
200 | while (args->type == OBJ_TYPE_PAIR) { | ||
201 | Object *car = eval(args->car); | ||
202 | if (car == NULL) { | ||
203 | car = obj_nil; | ||
204 | } | ||
205 | if (car->type != OBJ_TYPE_FIXNUM) { | ||
206 | fprintf(stderr, "error: div not supported for type %d\n", car->type); | ||
207 | return obj_nil; | ||
208 | } | ||
209 | if (car->fixnum == 0) { | ||
210 | fprintf(stderr, "error: division by zero\n"); | ||
211 | return obj_nil; | ||
212 | } | ||
213 | tot /= car->fixnum; | ||
214 | args = args->cdr; | ||
215 | } | ||
216 | return make_fixnum(tot); | ||
217 | } | ||
218 | |||
219 | Object * | ||
220 | proc_mod(Object *args) { | ||
221 | // Extract first parameter. | ||
222 | Object *car = eval(args->car); | ||
223 | if (car == NULL) { | ||
224 | fprintf(stderr, "error: not enough arguments\n"); | ||
225 | return obj_nil; | ||
226 | } | ||
227 | args = args->cdr; | ||
228 | ssize_t tot = car->fixnum; | ||
229 | |||
230 | while (args->type == OBJ_TYPE_PAIR) { | ||
231 | Object *car = eval(args->car); | ||
232 | if (car == NULL) { | ||
233 | car = obj_nil; | ||
234 | } | ||
235 | if (car->type != OBJ_TYPE_FIXNUM) { | ||
236 | fprintf(stderr, "error: div not supported for type %d\n", car->type); | ||
237 | return obj_nil; | ||
238 | } | ||
239 | if (car->fixnum == 0) { | ||
240 | fprintf(stderr, "error: division by zero\n"); | ||
241 | return obj_nil; | ||
242 | } | ||
243 | tot %= car->fixnum; | ||
244 | args = args->cdr; | ||
245 | } | ||
246 | return make_fixnum(tot); | ||
247 | } | ||
248 | |||
249 | // | ||
250 | // Display/Evaluation procedues. | ||
251 | // | ||
252 | |||
253 | Object * | ||
254 | proc_display(Object *args) { | ||
255 | if (args == NULL) { | ||
256 | return obj_nil; | ||
257 | } | ||
258 | if (args->type == OBJ_TYPE_PAIR) { | ||
259 | display(eval(args->car)); | ||
260 | } | ||
261 | return obj_nil; | ||
262 | } | ||
263 | |||
264 | Object * | ||
265 | proc_print(Object *args) { | ||
266 | if (args == NULL) { | ||
267 | return NULL; | ||
268 | } | ||
269 | if (args->type == OBJ_TYPE_PAIR) { | ||
270 | Object *obj = args->car; | ||
271 | if (obj->type == OBJ_TYPE_STRING) { | ||
272 | StringView scanner = (StringView) { | ||
273 | .start = obj->string, | ||
274 | .n = obj->string_n, | ||
275 | }; | ||
276 | while (scanner.n != 0) { | ||
277 | char c = sv_next(&scanner); | ||
278 | if (c == '\\' && sv_peek(&scanner) == 'n') { | ||
279 | putchar('\n'); | ||
280 | sv_next(&scanner); | ||
281 | continue; | ||
282 | } | ||
283 | if (c == '\\' && sv_peek(&scanner) == '"') { | ||
284 | putchar('"'); | ||
285 | sv_next(&scanner); | ||
286 | continue; | ||
287 | } | ||
288 | putchar(c); | ||
289 | } | ||
290 | } else { | ||
291 | fprintf(stderr, "error: print requires a string argument\n"); | ||
292 | } | ||
293 | } | ||
294 | return NULL; | ||
295 | } | ||
296 | |||
297 | // | ||
298 | // Type info procedures. | ||
299 | // | ||
300 | |||
301 | Object * | ||
302 | proc_is_boolean(Object *args) { | ||
303 | if (args->type != OBJ_TYPE_PAIR) { | ||
304 | fprintf(stderr, "error: wrong number of arguments.\n"); | ||
305 | return NULL; | ||
306 | } | ||
307 | Object *obj = eval(args->car); | ||
308 | return (obj == obj_true || obj == obj_false) ? obj_true : obj_false; | ||
309 | } | ||
310 | |||
311 | Object * | ||
312 | proc_is_null(Object *args) { | ||
313 | if (args->type != OBJ_TYPE_PAIR) { | ||
314 | fprintf(stderr, "error: wrong number of arguments.\n"); | ||
315 | return NULL; | ||
316 | } | ||
317 | Object *obj = eval(args->car); | ||
318 | return obj == obj_nil ? obj_true : obj_false; | ||
319 | } | ||
320 | |||
321 | Object * | ||
322 | proc_is_symbol(Object *args) { | ||
323 | if (args->type != OBJ_TYPE_PAIR) { | ||
324 | fprintf(stderr, "error: wrong number of arguments.\n"); | ||
325 | return NULL; | ||
326 | } | ||
327 | Object *obj = eval(args->car); | ||
328 | return obj->type == OBJ_TYPE_SYMBOL ? obj_true : obj_false; | ||
329 | } | ||
330 | |||
331 | Object * | ||
332 | proc_is_string(Object *args) { | ||
333 | if (args->type != OBJ_TYPE_PAIR) { | ||
334 | fprintf(stderr, "error: wrong number of arguments.\n"); | ||
335 | return NULL; | ||
336 | } | ||
337 | Object *obj = eval(args->car); | ||
338 | return obj->type == OBJ_TYPE_STRING ? obj_true : obj_false; | ||
339 | } | ||
340 | |||
341 | Object * | ||
342 | proc_is_fixnum(Object *args) { | ||
343 | if (args->type != OBJ_TYPE_PAIR) { | ||
344 | fprintf(stderr, "error: wrong number of arguments.\n"); | ||
345 | return NULL; | ||
346 | } | ||
347 | Object *obj = eval(args->car); | ||
348 | return obj->type == OBJ_TYPE_FIXNUM ? obj_true : obj_false; | ||
349 | } | ||
350 | |||
351 | Object * | ||
352 | proc_is_pair(Object *args) { | ||
353 | if (args->type != OBJ_TYPE_PAIR) { | ||
354 | fprintf(stderr, "error: wrong number of arguments.\n"); | ||
355 | return NULL; | ||
356 | } | ||
357 | Object *obj = eval(args->car); | ||
358 | return obj->type == OBJ_TYPE_PAIR ? obj_true : obj_false; | ||
359 | } | ||
360 | |||
361 | Object * | ||
362 | proc_is_procedure(Object *args) { | ||
363 | if (args->type != OBJ_TYPE_PAIR) { | ||
364 | fprintf(stderr, "error: wrong number of arguments.\n"); | ||
365 | return NULL; | ||
366 | } | ||
367 | Object *obj = eval(args->car); | ||
368 | return obj->type == OBJ_TYPE_PROCEDURE ? obj_true : obj_false; | ||
369 | } | ||
370 | |||
371 | // | ||
372 | // Boolean/conditional procedures. | ||
373 | // | ||
374 | |||
375 | Object * | ||
376 | proc_not(Object *args) { | ||
377 | if (args->type == OBJ_TYPE_PAIR) { | ||
378 | return eval(args->car) == obj_false ? obj_true : obj_false; | ||
379 | } | ||
380 | return eval(args) == obj_false ? obj_true : obj_false; | ||
381 | } | ||
382 | |||
383 | Object * | ||
384 | proc_and(Object *args) { | ||
385 | while (args != NULL && args != obj_nil) { | ||
386 | Object *obj = args->car; | ||
387 | if (args->car->type == OBJ_TYPE_PAIR) { | ||
388 | obj = eval(args->car); | ||
389 | } | ||
390 | if (proc_not(obj) == obj_true) { | ||
391 | return obj_false; | ||
392 | } | ||
393 | args = args->cdr; | ||
394 | } | ||
395 | return obj_true; | ||
396 | } | ||
397 | |||
398 | Object * | ||
399 | proc_or(Object *args) { | ||
400 | if (args->type != OBJ_TYPE_PAIR) { | ||
401 | return obj_false; | ||
402 | } | ||
403 | |||
404 | while (args != NULL && args != obj_nil) { | ||
405 | Object *obj = args->car; | ||
406 | if (args->car->type == OBJ_TYPE_PAIR) { | ||
407 | obj = eval(args->car); | ||
408 | } | ||
409 | if (proc_not(obj) == obj_false) { | ||
410 | return obj_true; | ||
411 | } | ||
412 | args = args->cdr; | ||
413 | } | ||
414 | return obj_false; | ||
415 | } | ||
416 | |||
417 | Object * | ||
418 | proc_if(Object *args) { | ||
419 | if (args->type != OBJ_TYPE_PAIR || args->cdr->type != OBJ_TYPE_PAIR) { | ||
420 | fprintf(stderr, "error: wrong number of arguments.\n"); | ||
421 | return NULL; | ||
422 | } | ||
423 | |||
424 | Object *condition = eval(args->car); | ||
425 | if (condition == obj_true) { | ||
426 | Object *ret = eval(args->cdr->car); | ||
427 | return ret; | ||
428 | } | ||
429 | if (args->cdr->cdr != obj_nil) { | ||
430 | Object *ret = eval(args->cdr->cdr->car); | ||
431 | return ret; | ||
432 | } | ||
433 | |||
434 | return obj_nil; | ||
435 | } | ||
436 | |||
437 | Object * | ||
438 | proc_cond(Object *args) { | ||
439 | if (args->type != OBJ_TYPE_PAIR) { | ||
440 | fprintf(stderr, "error: wrong number of arguments.\n"); | ||
441 | return NULL; | ||
442 | } | ||
443 | |||
444 | if (args->car->type != OBJ_TYPE_PAIR) { | ||
445 | fprintf(stderr, "error: wrong argument type.\n"); | ||
446 | return NULL; | ||
447 | } | ||
448 | |||
449 | while (args != obj_nil) { | ||
450 | Object *clause = args->car; | ||
451 | if (eval(clause->car) == obj_true) { | ||
452 | return eval(clause->cdr->car); | ||
453 | } | ||
454 | args = args->cdr; | ||
455 | } | ||
456 | |||
457 | return obj_nil; | ||
458 | } | ||
459 | |||
460 | Object * | ||
461 | proc_num_less_than(Object *args) { | ||
462 | if (args == obj_nil) { | ||
463 | fprintf(stderr, "error: wrong number of arguments type.\n"); | ||
464 | return NULL; | ||
465 | } | ||
466 | |||
467 | Object *obj = eval(args->car); | ||
468 | if (obj->type != OBJ_TYPE_FIXNUM) { | ||
469 | fprintf(stderr, "error: wrong argument type.\n"); | ||
470 | return NULL; | ||
471 | } | ||
472 | ssize_t prev = obj->fixnum; | ||
473 | args = args->cdr; | ||
474 | |||
475 | if (args == obj_nil) { | ||
476 | fprintf(stderr, "error: wrong number of arguments type.\n"); | ||
477 | return NULL; | ||
478 | } | ||
479 | while (args != obj_nil) { | ||
480 | Object *obj = eval(args->car); | ||
481 | if (obj->type != OBJ_TYPE_FIXNUM) { | ||
482 | fprintf(stderr, "error: wrong argument type.\n"); | ||
483 | return NULL; | ||
484 | } | ||
485 | if (prev >= obj->fixnum) { | ||
486 | return obj_false; | ||
487 | } | ||
488 | prev = obj->fixnum; | ||
489 | args = args->cdr; | ||
490 | } | ||
491 | return obj_true; | ||
492 | } | ||
493 | |||
494 | Object * | ||
495 | proc_num_greater_than(Object *args) { | ||
496 | if (args == obj_nil) { | ||
497 | fprintf(stderr, "error: wrong number of arguments type.\n"); | ||
498 | return NULL; | ||
499 | } | ||
500 | |||
501 | Object *obj = eval(args->car); | ||
502 | if (obj->type != OBJ_TYPE_FIXNUM) { | ||
503 | fprintf(stderr, "error: wrong argument type.\n"); | ||
504 | return NULL; | ||
505 | } | ||
506 | ssize_t prev = obj->fixnum; | ||
507 | args = args->cdr; | ||
508 | |||
509 | if (args == obj_nil) { | ||
510 | fprintf(stderr, "error: wrong number of arguments type.\n"); | ||
511 | return NULL; | ||
512 | } | ||
513 | while (args != obj_nil) { | ||
514 | Object *obj = eval(args->car); | ||
515 | if (obj->type != OBJ_TYPE_FIXNUM) { | ||
516 | fprintf(stderr, "error: wrong argument type.\n"); | ||
517 | return NULL; | ||
518 | } | ||
519 | if (prev <= obj->fixnum) { | ||
520 | return obj_false; | ||
521 | } | ||
522 | prev = obj->fixnum; | ||
523 | args = args->cdr; | ||
524 | } | ||
525 | return obj_true; | ||
526 | } | ||
527 | |||
528 | Object * | ||
529 | proc_num_lesseq_than(Object *args) { | ||
530 | if (args == obj_nil) { | ||
531 | fprintf(stderr, "error: wrong number of arguments type.\n"); | ||
532 | return NULL; | ||
533 | } | ||
534 | |||
535 | Object *obj = eval(args->car); | ||
536 | if (obj->type != OBJ_TYPE_FIXNUM) { | ||
537 | fprintf(stderr, "error: wrong argument type.\n"); | ||
538 | return NULL; | ||
539 | } | ||
540 | ssize_t prev = obj->fixnum; | ||
541 | args = args->cdr; | ||
542 | |||
543 | if (args == obj_nil) { | ||
544 | fprintf(stderr, "error: wrong number of arguments type.\n"); | ||
545 | return NULL; | ||
546 | } | ||
547 | while (args != obj_nil) { | ||
548 | Object *obj = eval(args->car); | ||
549 | if (obj->type != OBJ_TYPE_FIXNUM) { | ||
550 | fprintf(stderr, "error: wrong argument type.\n"); | ||
551 | return NULL; | ||
552 | } | ||
553 | if (prev > obj->fixnum) { | ||
554 | return obj_false; | ||
555 | } | ||
556 | prev = obj->fixnum; | ||
557 | args = args->cdr; | ||
558 | } | ||
559 | return obj_true; | ||
560 | } | ||
561 | |||
562 | Object * | ||
563 | proc_num_greatereq_than(Object *args) { | ||
564 | if (args == obj_nil) { | ||
565 | fprintf(stderr, "error: wrong number of arguments type.\n"); | ||
566 | return NULL; | ||
567 | } | ||
568 | |||
569 | Object *obj = eval(args->car); | ||
570 | if (obj->type != OBJ_TYPE_FIXNUM) { | ||
571 | fprintf(stderr, "error: wrong argument type.\n"); | ||
572 | return NULL; | ||
573 | } | ||
574 | ssize_t prev = obj->fixnum; | ||
575 | args = args->cdr; | ||
576 | |||
577 | if (args == obj_nil) { | ||
578 | fprintf(stderr, "error: wrong number of arguments type.\n"); | ||
579 | return NULL; | ||
580 | } | ||
581 | while (args != obj_nil) { | ||
582 | Object *obj = eval(args->car); | ||
583 | if (obj->type != OBJ_TYPE_FIXNUM) { | ||
584 | fprintf(stderr, "error: wrong argument type.\n"); | ||
585 | return NULL; | ||
586 | } | ||
587 | if (prev < obj->fixnum) { | ||
588 | return obj_false; | ||
589 | } | ||
590 | prev = obj->fixnum; | ||
591 | args = args->cdr; | ||
592 | } | ||
593 | return obj_true; | ||
594 | } | ||
595 | |||
596 | Object * | ||
597 | proc_num_equal(Object *args) { | ||
598 | if (args == obj_nil) { | ||
599 | fprintf(stderr, "error: wrong number of arguments type.\n"); | ||
600 | return NULL; | ||
601 | } | ||
602 | |||
603 | Object *obj = eval(args->car); | ||
604 | if (obj->type != OBJ_TYPE_FIXNUM) { | ||
605 | fprintf(stderr, "error: wrong argument type.\n"); | ||
606 | return NULL; | ||
607 | } | ||
608 | ssize_t prev = obj->fixnum; | ||
609 | args = args->cdr; | ||
610 | |||
611 | if (args == obj_nil) { | ||
612 | fprintf(stderr, "error: wrong number of arguments type.\n"); | ||
613 | return NULL; | ||
614 | } | ||
615 | while (args != obj_nil) { | ||
616 | Object *obj = eval(args->car); | ||
617 | if (obj->type != OBJ_TYPE_FIXNUM) { | ||
618 | fprintf(stderr, "error: wrong argument type.\n"); | ||
619 | return NULL; | ||
620 | } | ||
621 | if (prev != obj->fixnum) { | ||
622 | return obj_false; | ||
623 | } | ||
624 | prev = obj->fixnum; | ||
625 | args = args->cdr; | ||
626 | } | ||
627 | return obj_true; | ||
628 | } | ||
629 | |||
630 | // | ||
631 | // List operation procedures. | ||
632 | // | ||
633 | |||
634 | Object * | ||
635 | proc_car(Object *args) { | ||
636 | if (args == obj_nil) { | ||
637 | fprintf(stderr, "error: not enough arguments\n"); | ||
638 | return obj_nil; | ||
639 | } | ||
640 | Object *obj = eval(args->car); | ||
641 | if (obj->type != OBJ_TYPE_PAIR) { | ||
642 | fprintf(stderr, "error: wrong argument type\n"); | ||
643 | return obj_nil; | ||
644 | } | ||
645 | return obj->car; | ||
646 | } | ||
647 | |||
648 | Object * | ||
649 | proc_cdr(Object *args) { | ||
650 | if (args == obj_nil) { | ||
651 | fprintf(stderr, "error: not enough arguments\n"); | ||
652 | return obj_nil; | ||
653 | } | ||
654 | Object *obj = eval(args->car); | ||
655 | if (obj->type != OBJ_TYPE_PAIR) { | ||
656 | fprintf(stderr, "error: wrong argument type\n"); | ||
657 | return obj_nil; | ||
658 | } | ||
659 | return obj->cdr; | ||
660 | } | ||
661 | |||
662 | Object * | ||
663 | proc_cons(Object *args) { | ||
664 | if (args == obj_nil || args->cdr == obj_nil) { | ||
665 | fprintf(stderr, "error: not enough arguments\n"); | ||
666 | return obj_nil; | ||
667 | } | ||
668 | Object *a = eval(args->car); | ||
669 | Object *b = eval(args->cdr->car); | ||
670 | return make_pair(a, b); | ||
671 | } | ||
672 | |||
673 | Object * | ||
674 | proc_list(Object *args) { | ||
675 | if (args == obj_nil) { | ||
676 | return obj_nil; | ||
677 | } | ||
678 | Object *head = make_pair(eval(args->car), obj_nil); | ||
679 | Object *curr = head; | ||
680 | args = args->cdr; | ||
681 | while (args != obj_nil) { | ||
682 | curr->cdr = make_pair(eval(args->car), obj_nil); | ||
683 | curr = curr->cdr; | ||
684 | args = args->cdr; | ||
685 | } | ||
686 | return head; | ||
687 | } | ||
688 | |||
689 | // | ||
690 | // Polymorphic procedures. | ||
691 | // | ||
692 | |||
693 | Object * | ||
694 | proc_equal(Object *args) { | ||
695 | // TODO: stub | ||
696 | (void) args; | ||
697 | return NULL; | ||
698 | } | ||
699 | |||
700 | // TODO: fixnum left/right shift, mask, invert | ||
701 | // TODO: implement and test missing procedures | ||
702 | // TODO: add primitives for type transforms: string->symbol, symbol->string, etc | ||
703 | // TODO: properly implement nested environments | ||
704 | // TODO: implement support for quotes and semi-quotes | ||
705 | // TODO: LAMBDA | ||
706 | // TODO: let | ||
707 | // TODO: better error handling? | ||
708 | // TODO: Revise all instances where we are returning an object, since currently | ||
709 | // we may be returning a pointer to an object instead of a new one. Check also | ||
710 | // on eval function and everytime we do make_xxx(obj). | ||