1670 |
extern void to(environment *env) |
extern void to(environment *env) |
1671 |
{ |
{ |
1672 |
int ending, start, i; |
int ending, start, i; |
1673 |
value *iterator, *temp; |
value *iterator, *temp, *end; |
1674 |
|
|
1675 |
|
end= new_val(env); |
1676 |
|
|
1677 |
if(env->head->type==empty || CDR(env->head)->type==empty) { |
if(env->head->type==empty || CDR(env->head)->type==empty) { |
1678 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
1707 |
if(iterator->type==empty |
if(iterator->type==empty |
1708 |
|| (CAR(iterator)->type==symb |
|| (CAR(iterator)->type==symb |
1709 |
&& CAR(iterator)->content.sym->id[0]=='[')) { |
&& CAR(iterator)->content.sym->id[0]=='[')) { |
1710 |
temp= NULL; |
temp= end; |
1711 |
toss(env); |
toss(env); |
1712 |
} else { |
} else { |
1713 |
/* Search for first delimiter */ |
/* Search for first delimiter */ |
1714 |
while(CDR(iterator)!=NULL |
while(CDR(iterator)->type!=empty |
1715 |
&& (CAR(CDR(iterator))->type!=symb |
&& (CAR(CDR(iterator))->type!=symb |
1716 |
|| CAR(CDR(iterator))->content.sym->id[0]!='[')) |
|| CAR(CDR(iterator))->content.sym->id[0]!='[')) |
1717 |
iterator= CDR(iterator); |
iterator= CDR(iterator); |
1719 |
/* Extract list */ |
/* Extract list */ |
1720 |
temp= env->head; |
temp= env->head; |
1721 |
env->head= CDR(iterator); |
env->head= CDR(iterator); |
1722 |
CDR(iterator)= NULL; |
CDR(iterator)= end; |
1723 |
|
|
1724 |
if(env->head!=NULL) |
if(env->head->type!=empty) |
1725 |
toss(env); |
toss(env); |
1726 |
} |
} |
1727 |
|
|
2448 |
swap(env); if(env->err) return; |
swap(env); if(env->err) return; |
2449 |
toss(env); if(env->err) return; |
toss(env); if(env->err) return; |
2450 |
} |
} |
2451 |
|
|
2452 |
|
/* 2: 3 => */ |
2453 |
|
/* 1: [ [ 1 . 2 ] [ 3 . 4 ] ] => 1: [ 3 . 4 ] */ |
2454 |
|
extern void assq(environment *env) |
2455 |
|
{ |
2456 |
|
assocgen(env, eq); |
2457 |
|
} |
2458 |
|
|
2459 |
|
|
2460 |
|
/* General assoc function */ |
2461 |
|
void assocgen(environment *env, funcp eqfunc) |
2462 |
|
{ |
2463 |
|
value *key, *item; |
2464 |
|
|
2465 |
|
/* Needs two values on the stack, the top one must be an association |
2466 |
|
list */ |
2467 |
|
if(env->head->type==empty || CDR(env->head)->type==empty) { |
2468 |
|
printerr("Too Few Arguments"); |
2469 |
|
env->err= 1; |
2470 |
|
return; |
2471 |
|
} |
2472 |
|
|
2473 |
|
if(CAR(env->head)->type!=tcons) { |
2474 |
|
printerr("Bad Argument Type"); |
2475 |
|
env->err= 2; |
2476 |
|
return; |
2477 |
|
} |
2478 |
|
|
2479 |
|
key=CAR(CDR(env->head)); |
2480 |
|
item=CAR(env->head); |
2481 |
|
|
2482 |
|
while(item->type == tcons){ |
2483 |
|
if(CAR(item)->type != tcons){ |
2484 |
|
printerr("Bad Argument Type"); |
2485 |
|
env->err= 2; |
2486 |
|
return; |
2487 |
|
} |
2488 |
|
push_val(env, key); |
2489 |
|
push_val(env, CAR(CAR(item))); |
2490 |
|
eqfunc(env); if(env->err) return; |
2491 |
|
|
2492 |
|
/* Check the result of 'eqfunc' */ |
2493 |
|
if(env->head->type==empty) { |
2494 |
|
printerr("Too Few Arguments"); |
2495 |
|
env->err= 1; |
2496 |
|
return; |
2497 |
|
} |
2498 |
|
if(CAR(env->head)->type!=integer) { |
2499 |
|
printerr("Bad Argument Type"); |
2500 |
|
env->err= 2; |
2501 |
|
return; |
2502 |
|
} |
2503 |
|
|
2504 |
|
if(CAR(env->head)->content.i){ |
2505 |
|
toss(env); if(env->err) return; |
2506 |
|
break; |
2507 |
|
} |
2508 |
|
toss(env); if(env->err) return; |
2509 |
|
|
2510 |
|
if(item->type!=tcons) { |
2511 |
|
printerr("Bad Argument Type"); |
2512 |
|
env->err= 2; |
2513 |
|
return; |
2514 |
|
} |
2515 |
|
|
2516 |
|
item=CDR(item); |
2517 |
|
} |
2518 |
|
|
2519 |
|
if(item->type == tcons){ /* A match was found */ |
2520 |
|
push_val(env, CAR(item)); |
2521 |
|
} else { |
2522 |
|
push_int(env, 0); |
2523 |
|
} |
2524 |
|
swap(env); if(env->err) return; |
2525 |
|
toss(env); if(env->err) return; |
2526 |
|
swap(env); if(env->err) return; |
2527 |
|
toss(env); |
2528 |
|
} |