58 |
stackitem *head; /* Head of the stack */ |
stackitem *head; /* Head of the stack */ |
59 |
hashtbl symbols; /* Hash table of all variable bindings */ |
hashtbl symbols; /* Hash table of all variable bindings */ |
60 |
int err; /* Error flag */ |
int err; /* Error flag */ |
|
int non_eval_flag; |
|
61 |
char *in_string; /* Input pending to be read */ |
char *in_string; /* Input pending to be read */ |
62 |
char *free_string; /* Free this string when all input is |
char *free_string; /* Free this string when all input is |
63 |
read from in_string */ |
read from in_string */ |
74 |
|
|
75 |
env->in_string= NULL; |
env->in_string= NULL; |
76 |
env->err= 0; |
env->err= 0; |
|
env->non_eval_flag= 0; |
|
77 |
for(i= 0; i<HASHTBLSIZE; i++) |
for(i= 0; i<HASHTBLSIZE; i++) |
78 |
env->symbols[i]= NULL; |
env->symbols[i]= NULL; |
79 |
} |
} |
100 |
free(item); /* free the stackitem */ |
free(item); /* free the stackitem */ |
101 |
item=temp; /* go to next stackitem */ |
item=temp; /* go to next stackitem */ |
102 |
} |
} |
|
free(val); /* Free the actual list value */ |
|
103 |
break; |
break; |
104 |
case integer: |
case integer: |
105 |
case func: |
case func: |
106 |
|
break; |
107 |
case symb: |
case symb: |
108 |
|
free(((symbol*)(val->content.ptr))->id); |
109 |
|
if(((symbol*)(val->content.ptr))->val!=NULL) |
110 |
|
free_val(((symbol*)(val->content.ptr))->val); |
111 |
|
free(val->content.ptr); |
112 |
break; |
break; |
113 |
} |
} |
114 |
|
free(val); /* Free the actual list value */ |
115 |
} |
} |
116 |
} |
} |
117 |
|
|
177 |
|
|
178 |
new_value->content.val= in_val; |
new_value->content.val= in_val; |
179 |
new_value->type= integer; |
new_value->type= integer; |
180 |
new_value->refcount=1; |
new_value->refcount= 1; |
181 |
|
|
182 |
push_val(env, new_value); |
push_val(env, new_value); |
183 |
} |
} |
190 |
new_value->content.ptr= malloc(strlen(in_string)+1); |
new_value->content.ptr= malloc(strlen(in_string)+1); |
191 |
strcpy(new_value->content.ptr, in_string); |
strcpy(new_value->content.ptr, in_string); |
192 |
new_value->type= string; |
new_value->type= string; |
193 |
new_value->refcount=1; |
new_value->refcount= 1; |
194 |
|
|
195 |
push_val(env, new_value); |
push_val(env, new_value); |
196 |
} |
} |
216 |
} |
} |
217 |
|
|
218 |
extern void mangle(environment *env){ |
extern void mangle(environment *env){ |
|
value *new_value; |
|
219 |
char *new_string; |
char *new_string; |
220 |
|
|
221 |
if((env->head)==NULL) { |
if((env->head)==NULL) { |
235 |
toss(env); |
toss(env); |
236 |
if(env->err) return; |
if(env->err) return; |
237 |
|
|
238 |
new_value= malloc(sizeof(value)); |
push_cstring(env, new_string); |
|
new_value->content.ptr= new_string; |
|
|
new_value->type= string; |
|
|
new_value->refcount=1; |
|
|
|
|
|
push_val(env, new_value); |
|
239 |
} |
} |
240 |
|
|
241 |
/* Push a symbol onto the stack. */ |
/* Push a symbol onto the stack. */ |
337 |
} |
} |
338 |
|
|
339 |
/* Prints the top element of the stack. */ |
/* Prints the top element of the stack. */ |
340 |
void print_h(stackitem *stack_head) |
void print_h(stackitem *stack_head, int noquote) |
341 |
{ |
{ |
342 |
switch(stack_head->item->type) { |
switch(stack_head->item->type) { |
343 |
case integer: |
case integer: |
344 |
printf("%d", stack_head->item->content.val); |
printf("%d", stack_head->item->content.val); |
345 |
break; |
break; |
346 |
case string: |
case string: |
347 |
printf("%s", (char*)stack_head->item->content.ptr); |
if(noquote) |
348 |
|
printf("%s", (char*)stack_head->item->content.ptr); |
349 |
|
else |
350 |
|
printf("\"%s\"", (char*)stack_head->item->content.ptr); |
351 |
break; |
break; |
352 |
case symb: |
case symb: |
353 |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
360 |
stack_head=(stackitem *)(stack_head->item->content.ptr); |
stack_head=(stackitem *)(stack_head->item->content.ptr); |
361 |
printf("[ "); |
printf("[ "); |
362 |
while(stack_head != NULL) { |
while(stack_head != NULL) { |
363 |
print_h(stack_head); |
print_h(stack_head, noquote); |
364 |
printf(" "); |
printf(" "); |
365 |
stack_head=stack_head->next; |
stack_head=stack_head->next; |
366 |
} |
} |
375 |
env->err=1; |
env->err=1; |
376 |
return; |
return; |
377 |
} |
} |
378 |
print_h(env->head); |
print_h(env->head, 0); |
379 |
|
nl(); |
380 |
} |
} |
381 |
|
|
382 |
/* Prints the top element of the stack and then discards it. */ |
/* Prints the top element of the stack and then discards it. */ |
387 |
toss(env); |
toss(env); |
388 |
} |
} |
389 |
|
|
390 |
|
extern void princ_(environment *env) { |
391 |
|
if(env->head==NULL) { |
392 |
|
printerr("Too Few Arguments"); |
393 |
|
env->err=1; |
394 |
|
return; |
395 |
|
} |
396 |
|
print_h(env->head, 1); |
397 |
|
} |
398 |
|
|
399 |
|
/* Prints the top element of the stack and then discards it. */ |
400 |
|
extern void princ(environment *env) |
401 |
|
{ |
402 |
|
princ_(env); |
403 |
|
if(env->err) return; |
404 |
|
toss(env); |
405 |
|
} |
406 |
|
|
407 |
/* Only to be called by function printstack. */ |
/* Only to be called by function printstack. */ |
408 |
void print_st(stackitem *stack_head, long counter) |
void print_st(stackitem *stack_head, long counter) |
409 |
{ |
{ |
410 |
if(stack_head->next != NULL) |
if(stack_head->next != NULL) |
411 |
print_st(stack_head->next, counter+1); |
print_st(stack_head->next, counter+1); |
412 |
printf("%ld: ", counter); |
printf("%ld: ", counter); |
413 |
print_h(stack_head); |
print_h(stack_head, 0); |
414 |
nl(); |
nl(); |
415 |
} |
} |
416 |
|
|
418 |
extern void printstack(environment *env) |
extern void printstack(environment *env) |
419 |
{ |
{ |
420 |
if(env->head == NULL) { |
if(env->head == NULL) { |
421 |
|
printf("Stack Empty\n"); |
422 |
return; |
return; |
423 |
} |
} |
424 |
print_st(env->head, 1); |
print_st(env->head, 1); |
|
nl(); |
|
425 |
} |
} |
426 |
|
|
427 |
/* Swap the two top elements on the stack. */ |
/* Swap the two top elements on the stack. */ |
494 |
value* temp_val; |
value* temp_val; |
495 |
stackitem* iterator; |
stackitem* iterator; |
496 |
|
|
497 |
|
eval_start: |
498 |
|
|
499 |
if(env->head==NULL) { |
if(env->head==NULL) { |
500 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
501 |
env->err=1; |
env->err=1; |
502 |
return; |
return; |
503 |
} |
} |
504 |
|
|
|
eval_start: |
|
|
|
|
505 |
switch(env->head->item->type) { |
switch(env->head->item->type) { |
506 |
/* if it's a symbol */ |
/* if it's a symbol */ |
507 |
case symb: |
case symb: |
749 |
for(i= 0; i<HASHTBLSIZE; i++) { |
for(i= 0; i<HASHTBLSIZE; i++) { |
750 |
while(env->symbols[i]!= NULL) { |
while(env->symbols[i]!= NULL) { |
751 |
forget_sym(&(env->symbols[i])); |
forget_sym(&(env->symbols[i])); |
|
env->symbols[i]= NULL; |
|
752 |
} |
} |
753 |
|
env->symbols[i]= NULL; |
754 |
} |
} |
755 |
exit(EXIT_SUCCESS); |
exit(EXIT_SUCCESS); |
756 |
} |
} |
829 |
init_env(&myenv); |
init_env(&myenv); |
830 |
|
|
831 |
while(1) { |
while(1) { |
832 |
if(myenv.in_string==NULL) |
if(myenv.in_string==NULL) { |
833 |
|
nl(); |
834 |
printstack(&myenv); |
printstack(&myenv); |
835 |
|
printf("> "); |
836 |
|
} |
837 |
read(&myenv); |
read(&myenv); |
838 |
if(myenv.err) { |
if(myenv.err) { |
839 |
printf("(error %d) ", myenv.err); |
printf("(error %d) ", myenv.err); |
1231 |
size_t inlength; |
size_t inlength; |
1232 |
|
|
1233 |
if(env->in_string==NULL) { |
if(env->in_string==NULL) { |
1234 |
|
if(depth > 0) { |
1235 |
|
printf("]> "); |
1236 |
|
} |
1237 |
readline(env); if(env->err) return; |
readline(env); if(env->err) return; |
1238 |
|
|
1239 |
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |