9 |
/* strcmp, strcpy, strlen, strcat, strdup */ |
/* strcmp, strcpy, strlen, strcat, strdup */ |
10 |
#include <string.h> |
#include <string.h> |
11 |
|
|
12 |
#define HASHTBLSIZE 65536 |
#define HASHTBLSIZE 2048 |
13 |
|
|
14 |
/* First, define some types. */ |
/* First, define some types. */ |
15 |
|
|
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 */ |
61 |
int non_eval_flag; |
int non_eval_flag; |
62 |
|
char *in_string; /* Input pending to be read */ |
63 |
} environment; |
} environment; |
64 |
|
|
65 |
/* A type for pointers to external functions */ |
/* A type for pointers to external functions */ |
71 |
{ |
{ |
72 |
int i; |
int i; |
73 |
|
|
74 |
|
env->in_string= NULL; |
75 |
env->err= 0; |
env->err= 0; |
76 |
env->non_eval_flag= 0; |
env->non_eval_flag= 0; |
77 |
for(i= 0; i<HASHTBLSIZE; i++) |
for(i= 0; i<HASHTBLSIZE; i++) |
155 |
} |
} |
156 |
} |
} |
157 |
|
|
|
/* Generic push function. */ |
|
|
void push(stackitem** stack_head, stackitem* in_item) |
|
|
{ |
|
|
in_item->next= *stack_head; |
|
|
*stack_head= in_item; |
|
|
} |
|
|
|
|
158 |
/* Push a value onto the stack */ |
/* Push a value onto the stack */ |
159 |
void push_val(stackitem **stack_head, value *val) |
void push_val(environment *env, value *val) |
160 |
{ |
{ |
161 |
stackitem *new_item= malloc(sizeof(stackitem)); |
stackitem *new_item= malloc(sizeof(stackitem)); |
162 |
new_item->item= val; |
new_item->item= val; |
163 |
val->refcount++; |
val->refcount++; |
164 |
push(stack_head, new_item); |
new_item->next= env->head; |
165 |
|
env->head= new_item; |
166 |
} |
} |
167 |
|
|
168 |
/* Push an integer onto the stack. */ |
/* Push an integer onto the stack. */ |
169 |
void push_int(stackitem **stack_head, int in_val) |
void push_int(environment *env, int in_val) |
170 |
{ |
{ |
171 |
value *new_value= malloc(sizeof(value)); |
value *new_value= malloc(sizeof(value)); |
|
stackitem *new_item= malloc(sizeof(stackitem)); |
|
|
new_item->item= new_value; |
|
172 |
|
|
173 |
new_value->content.val= in_val; |
new_value->content.val= in_val; |
174 |
new_value->type= integer; |
new_value->type= integer; |
175 |
new_value->refcount=1; |
new_value->refcount=1; |
176 |
|
|
177 |
push(stack_head, new_item); |
push_val(env, new_value); |
178 |
} |
} |
179 |
|
|
180 |
/* Copy a string onto the stack. */ |
/* Copy a string onto the stack. */ |
181 |
void push_cstring(stackitem **stack_head, const char *in_string) |
void push_cstring(environment *env, const char *in_string) |
182 |
{ |
{ |
183 |
value *new_value= malloc(sizeof(value)); |
value *new_value= malloc(sizeof(value)); |
|
stackitem *new_item= malloc(sizeof(stackitem)); |
|
|
new_item->item=new_value; |
|
184 |
|
|
185 |
new_value->content.ptr= malloc(strlen(in_string)+1); |
new_value->content.ptr= malloc(strlen(in_string)+1); |
186 |
strcpy(new_value->content.ptr, in_string); |
strcpy(new_value->content.ptr, in_string); |
187 |
new_value->type= string; |
new_value->type= string; |
188 |
new_value->refcount=1; |
new_value->refcount=1; |
189 |
|
|
190 |
push(stack_head, new_item); |
push_val(env, new_value); |
191 |
} |
} |
192 |
|
|
193 |
/* Mangle a symbol name to a valid C identifier name */ |
/* Mangle a symbol name to a valid C identifier name */ |
236 |
new_value->type= string; |
new_value->type= string; |
237 |
new_value->refcount=1; |
new_value->refcount=1; |
238 |
|
|
239 |
push_val(&(env->head), new_value); |
push_val(env, new_value); |
240 |
} |
} |
241 |
|
|
242 |
/* Push a symbol onto the stack. */ |
/* Push a symbol onto the stack. */ |
243 |
void push_sym(environment *env, const char *in_string) |
void push_sym(environment *env, const char *in_string) |
244 |
{ |
{ |
|
stackitem *new_item; /* The new stack item */ |
|
|
/* ...which will contain... */ |
|
245 |
value *new_value; /* A new symbol value */ |
value *new_value; /* A new symbol value */ |
246 |
/* ...which might point to... */ |
/* ...which might point to... */ |
247 |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
symbol **new_symbol; /* (if needed) A new actual symbol */ |
254 |
const char *dlerr; /* Dynamic linker error */ |
const char *dlerr; /* Dynamic linker error */ |
255 |
char *mangled; /* Mangled function name */ |
char *mangled; /* Mangled function name */ |
256 |
|
|
|
/* Create a new stack item containing a new value */ |
|
|
new_item= malloc(sizeof(stackitem)); |
|
257 |
new_value= malloc(sizeof(value)); |
new_value= malloc(sizeof(value)); |
|
new_item->item=new_value; |
|
258 |
|
|
259 |
/* The new value is a symbol */ |
/* The new value is a symbol */ |
260 |
new_value->type= symb; |
new_value->type= symb; |
298 |
new_fvalue->refcount= 1; |
new_fvalue->refcount= 1; |
299 |
} |
} |
300 |
} |
} |
301 |
push(&(env->head), new_item); |
push_val(env, new_value); |
302 |
} |
} |
303 |
|
|
304 |
/* Print newline. */ |
/* Print newline. */ |
462 |
} |
} |
463 |
toss(env); /* toss the symbol */ |
toss(env); /* toss the symbol */ |
464 |
if(env->err) return; |
if(env->err) return; |
465 |
push_val(&(env->head), val); /* Return its bound value */ |
push_val(env, val); /* Return its bound value */ |
466 |
} |
} |
467 |
|
|
|
void stack_read(environment*, char*); |
|
|
|
|
468 |
/* If the top element is a symbol, determine if it's bound to a |
/* If the top element is a symbol, determine if it's bound to a |
469 |
function value, and if it is, toss the symbol and execute the |
function value, and if it is, toss the symbol and execute the |
470 |
function. */ |
function. */ |
473 |
funcp in_func; |
funcp in_func; |
474 |
value* temp_val; |
value* temp_val; |
475 |
stackitem* iterator; |
stackitem* iterator; |
|
char* temp_string; |
|
476 |
|
|
477 |
if(env->head==NULL) { |
if(env->head==NULL) { |
478 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
480 |
return; |
return; |
481 |
} |
} |
482 |
|
|
483 |
|
eval_start: |
484 |
|
|
485 |
switch(env->head->item->type) { |
switch(env->head->item->type) { |
486 |
/* if it's a symbol */ |
/* if it's a symbol */ |
487 |
case symb: |
case symb: |
488 |
rcl(env); /* get its contents */ |
rcl(env); /* get its contents */ |
489 |
if(env->err) return; |
if(env->err) return; |
490 |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
491 |
return eval(env); /* evaluate the value */ |
goto eval_start; |
492 |
} |
} |
493 |
return; |
return; |
494 |
|
|
507 |
if(env->err) return; |
if(env->err) return; |
508 |
iterator= (stackitem*)temp_val->content.ptr; |
iterator= (stackitem*)temp_val->content.ptr; |
509 |
while(iterator!=NULL) { |
while(iterator!=NULL) { |
510 |
push_val(&(env->head), iterator->item); |
push_val(env, iterator->item); |
511 |
if(env->head->item->type==symb |
if(env->head->item->type==symb |
512 |
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
513 |
toss(env); |
toss(env); |
514 |
if(env->err) return; |
if(env->err) return; |
515 |
if(iterator->next == NULL){ |
if(iterator->next == NULL){ |
516 |
free_val(temp_val); |
free_val(temp_val); |
517 |
return eval(env); |
goto eval_start; |
518 |
} |
} |
519 |
eval(env); |
eval(env); |
520 |
if(env->err) return; |
if(env->err) return; |
524 |
free_val(temp_val); |
free_val(temp_val); |
525 |
return; |
return; |
526 |
|
|
527 |
/* If it's a string */ |
default: |
|
case string: |
|
|
temp_val= env->head->item; |
|
|
env->head->item->refcount++; |
|
|
toss(env); |
|
|
if(env->err) return; |
|
|
temp_string= malloc(strlen((char*)temp_val->content.ptr)+5); |
|
|
strcpy(temp_string, "[ "); |
|
|
strcpy(temp_string+2, (char*)temp_val->content.ptr); |
|
|
free_val(temp_val); |
|
|
strcat(temp_string, " ]"); |
|
|
stack_read(env, temp_string); |
|
|
free(temp_string); |
|
|
return eval(env); |
|
|
|
|
|
case integer: |
|
528 |
return; |
return; |
529 |
} |
} |
530 |
} |
} |
559 |
/* Make a list. */ |
/* Make a list. */ |
560 |
extern void pack(environment *env) |
extern void pack(environment *env) |
561 |
{ |
{ |
|
void* delimiter; |
|
562 |
stackitem *iterator, *temp; |
stackitem *iterator, *temp; |
563 |
value *pack; |
value *pack; |
564 |
|
|
|
delimiter= env->head->item->content.ptr; /* Get delimiter */ |
|
|
toss(env); |
|
|
|
|
565 |
iterator= env->head; |
iterator= env->head; |
566 |
|
|
567 |
if(iterator==NULL || iterator->item->content.ptr==delimiter) { |
if(iterator==NULL |
568 |
|
|| (iterator->item->type==symb |
569 |
|
&& ((symbol*)(iterator->item->content.ptr))->id[0]=='[')) { |
570 |
temp= NULL; |
temp= NULL; |
571 |
toss(env); |
toss(env); |
572 |
} else { |
} else { |
573 |
/* Search for first delimiter */ |
/* Search for first delimiter */ |
574 |
while(iterator->next!=NULL |
while(iterator->next!=NULL |
575 |
&& iterator->next->item->content.ptr!=delimiter) |
&& (iterator->next->item->type!=symb |
576 |
|
|| ((symbol*)(iterator->next->item->content.ptr))->id[0]!='[')) |
577 |
iterator= iterator->next; |
iterator= iterator->next; |
578 |
|
|
579 |
/* Extract list */ |
/* Extract list */ |
591 |
pack->content.ptr= temp; |
pack->content.ptr= temp; |
592 |
pack->refcount= 1; |
pack->refcount= 1; |
593 |
|
|
594 |
temp= malloc(sizeof(stackitem)); |
push_val(env, pack); |
|
temp->item= pack; |
|
|
|
|
|
push(&(env->head), temp); |
|
595 |
rev(env); |
rev(env); |
596 |
} |
} |
597 |
|
|
|
/* Parse input. */ |
|
|
void stack_read(environment *env, char *in_line) |
|
|
{ |
|
|
char *temp, *rest; |
|
|
int itemp; |
|
|
size_t inlength= strlen(in_line)+1; |
|
|
int convert= 0; |
|
|
|
|
|
temp= malloc(inlength); |
|
|
rest= malloc(inlength); |
|
|
|
|
|
do { |
|
|
/* If comment */ |
|
|
if((convert= sscanf(in_line, "#%[^\n\r]", rest))) { |
|
|
free(temp); free(rest); |
|
|
return; |
|
|
} |
|
|
|
|
|
/* If string */ |
|
|
if((convert= sscanf(in_line, "\"%[^\"\n\r]\" %[^\n\r]", temp, rest))) { |
|
|
push_cstring(&(env->head), temp); |
|
|
break; |
|
|
} |
|
|
/* If integer */ |
|
|
if((convert= sscanf(in_line, "%d %[^\n\r]", &itemp, rest))) { |
|
|
push_int(&(env->head), itemp); |
|
|
break; |
|
|
} |
|
|
/* Escape ';' with '\' */ |
|
|
if((convert= sscanf(in_line, "\\%c%[^\n\r]", temp, rest))) { |
|
|
temp[1]= '\0'; |
|
|
push_sym(env, temp); |
|
|
break; |
|
|
} |
|
|
/* If symbol */ |
|
|
if((convert= sscanf(in_line, "%[^][ ;\n\r]%[^\n\r]", temp, rest))) { |
|
|
push_sym(env, temp); |
|
|
break; |
|
|
} |
|
|
/* If single char */ |
|
|
if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest))) { |
|
|
if(*temp==';') { |
|
|
if(!env->non_eval_flag) { |
|
|
eval(env); /* Evaluate top element */ |
|
|
break; |
|
|
} |
|
|
|
|
|
push_sym(env, ";"); |
|
|
break; |
|
|
} |
|
|
|
|
|
if(*temp==']') { |
|
|
push_sym(env, "["); |
|
|
pack(env); |
|
|
if(env->non_eval_flag) |
|
|
env->non_eval_flag--; |
|
|
break; |
|
|
} |
|
|
|
|
|
if(*temp=='[') { |
|
|
push_sym(env, "["); |
|
|
env->non_eval_flag++; |
|
|
break; |
|
|
} |
|
|
} |
|
|
} while(0); |
|
|
|
|
|
free(temp); |
|
|
|
|
|
if(convert<2) { |
|
|
free(rest); |
|
|
return; |
|
|
} |
|
|
|
|
|
stack_read(env, rest); |
|
|
|
|
|
free(rest); |
|
|
} |
|
|
|
|
598 |
/* Relocate elements of the list on the stack. */ |
/* Relocate elements of the list on the stack. */ |
599 |
extern void expand(environment *env) |
extern void expand(environment *env) |
600 |
{ |
{ |
651 |
result= (left==right); |
result= (left==right); |
652 |
|
|
653 |
toss(env); toss(env); |
toss(env); toss(env); |
654 |
push_int(&(env->head), result); |
push_int(env, result); |
655 |
} |
} |
656 |
|
|
657 |
/* Negates the top element on the stack. */ |
/* Negates the top element on the stack. */ |
673 |
|
|
674 |
val= env->head->item->content.val; |
val= env->head->item->content.val; |
675 |
toss(env); |
toss(env); |
676 |
push_int(&(env->head), !val); |
push_int(env, !val); |
677 |
} |
} |
678 |
|
|
679 |
/* Compares the two top elements on the stack and return 0 if they're the |
/* Compares the two top elements on the stack and return 0 if they're the |
779 |
|
|
780 |
/* Returns the current error number to the stack */ |
/* Returns the current error number to the stack */ |
781 |
extern void errn(environment *env){ |
extern void errn(environment *env){ |
782 |
push_int(&(env->head), env->err); |
push_int(env, env->err); |
783 |
} |
} |
784 |
|
|
785 |
|
extern void read(environment*); |
786 |
|
|
787 |
int main() |
int main() |
788 |
{ |
{ |
789 |
environment myenv; |
environment myenv; |
|
char in_string[100]; |
|
790 |
|
|
791 |
init_env(&myenv); |
init_env(&myenv); |
792 |
|
|
793 |
printf("okidok\n "); |
while(1) { |
794 |
|
if(myenv.in_string==NULL) |
795 |
while(fgets(in_string, 100, stdin) != NULL) { |
printstack(&myenv); |
796 |
stack_read(&myenv, in_string); |
read(&myenv); |
797 |
if(myenv.err) { |
if(myenv.err) { |
798 |
printf("(error %d) ", myenv.err); |
printf("(error %d) ", myenv.err); |
799 |
myenv.err=0; |
myenv.err=0; |
800 |
|
} else if(myenv.head!=NULL |
801 |
|
&& myenv.head->item->type==symb |
802 |
|
&& ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') { |
803 |
|
toss(&myenv); /* No error check in main */ |
804 |
|
eval(&myenv); |
805 |
} |
} |
|
printf("okidok\n "); |
|
806 |
} |
} |
807 |
quit(&myenv); |
quit(&myenv); |
808 |
return EXIT_FAILURE; |
return EXIT_FAILURE; |
834 |
strcpy(new_string, b_val->content.ptr); |
strcpy(new_string, b_val->content.ptr); |
835 |
strcat(new_string, a_val->content.ptr); |
strcat(new_string, a_val->content.ptr); |
836 |
free_val(a_val); free_val(b_val); |
free_val(a_val); free_val(b_val); |
837 |
push_cstring(&(env->head), new_string); |
push_cstring(env, new_string); |
838 |
free(new_string); |
free(new_string); |
839 |
return; |
return; |
840 |
} |
} |
848 |
a=env->head->item->content.val; |
a=env->head->item->content.val; |
849 |
toss(env); |
toss(env); |
850 |
if(env->err) return; |
if(env->err) return; |
851 |
b=env->head->item->content.val; |
if(env->head->item->refcount == 1) |
852 |
|
env->head->item->content.val += a; |
853 |
|
else { |
854 |
|
b=env->head->item->content.val; |
855 |
|
toss(env); |
856 |
|
if(env->err) return; |
857 |
|
push_int(env, a+b); |
858 |
|
} |
859 |
|
} |
860 |
|
|
861 |
|
/* - */ |
862 |
|
extern void sx_2d(environment *env) { |
863 |
|
int a, b; |
864 |
|
|
865 |
|
if((env->head)==NULL || env->head->next==NULL) { |
866 |
|
printerr("Too Few Arguments"); |
867 |
|
env->err=1; |
868 |
|
return; |
869 |
|
} |
870 |
|
|
871 |
|
if(env->head->item->type!=integer |
872 |
|
|| env->head->next->item->type!=integer) { |
873 |
|
printerr("Bad Argument Type"); |
874 |
|
env->err=2; |
875 |
|
return; |
876 |
|
} |
877 |
|
a=env->head->item->content.val; |
878 |
|
toss(env); |
879 |
|
if(env->err) return; |
880 |
|
if(env->head->item->refcount == 1) |
881 |
|
env->head->item->content.val -= a; |
882 |
|
else { |
883 |
|
b=env->head->item->content.val; |
884 |
|
toss(env); |
885 |
|
if(env->err) return; |
886 |
|
push_int(env, b-a); |
887 |
|
} |
888 |
|
} |
889 |
|
|
890 |
|
/* > */ |
891 |
|
extern void sx_3e(environment *env) { |
892 |
|
int a, b; |
893 |
|
|
894 |
|
if((env->head)==NULL || env->head->next==NULL) { |
895 |
|
printerr("Too Few Arguments"); |
896 |
|
env->err=1; |
897 |
|
return; |
898 |
|
} |
899 |
|
|
900 |
|
if(env->head->item->type!=integer |
901 |
|
|| env->head->next->item->type!=integer) { |
902 |
|
printerr("Bad Argument Type"); |
903 |
|
env->err=2; |
904 |
|
return; |
905 |
|
} |
906 |
|
a=env->head->item->content.val; |
907 |
toss(env); |
toss(env); |
908 |
if(env->err) return; |
if(env->err) return; |
909 |
push_int(&(env->head), a+b); |
if(env->head->item->refcount == 1) |
910 |
|
env->head->item->content.val = (env->head->item->content.val > a); |
911 |
|
else { |
912 |
|
b=env->head->item->content.val; |
913 |
|
toss(env); |
914 |
|
if(env->err) return; |
915 |
|
push_int(env, b>a); |
916 |
|
} |
917 |
} |
} |
918 |
|
|
919 |
/* Return copy of a value */ |
/* Return copy of a value */ |
968 |
env->err=1; |
env->err=1; |
969 |
return; |
return; |
970 |
} |
} |
971 |
push_val(&(env->head), copy_val(env->head->item)); |
push_val(env, copy_val(env->head->item)); |
972 |
} |
} |
973 |
|
|
974 |
/* "if", If-Then */ |
/* "if", If-Then */ |
1042 |
extern void sx_7768696c65(environment *env) { |
extern void sx_7768696c65(environment *env) { |
1043 |
|
|
1044 |
int truth; |
int truth; |
1045 |
|
value *loop, *test; |
1046 |
|
|
1047 |
if((env->head)==NULL || env->head->next==NULL) { |
if((env->head)==NULL || env->head->next==NULL) { |
1048 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
1050 |
return; |
return; |
1051 |
} |
} |
1052 |
|
|
1053 |
|
loop= env->head->item; |
1054 |
|
loop->refcount++; |
1055 |
|
toss(env); if(env->err) return; |
1056 |
|
|
1057 |
|
test= env->head->item; |
1058 |
|
test->refcount++; |
1059 |
|
toss(env); if(env->err) return; |
1060 |
|
|
1061 |
do { |
do { |
1062 |
swap(env); if(env->err) return; |
push_val(env, test); |
1063 |
dup(env); if(env->err) return; |
eval(env); |
|
eval(env); if(env->err) return; |
|
1064 |
|
|
1065 |
if(env->head->item->type != integer) { |
if(env->head->item->type != integer) { |
1066 |
printerr("Bad Argument Type"); |
printerr("Bad Argument Type"); |
1069 |
} |
} |
1070 |
|
|
1071 |
truth= env->head->item->content.val; |
truth= env->head->item->content.val; |
|
|
|
1072 |
toss(env); if(env->err) return; |
toss(env); if(env->err) return; |
|
swap(env); if(env->err) return; |
|
1073 |
|
|
1074 |
if(truth) { |
if(truth) { |
1075 |
dup(env); |
push_val(env, loop); |
1076 |
eval(env); |
eval(env); |
1077 |
} else { |
} else { |
1078 |
toss(env); |
toss(env); |
|
toss(env); |
|
1079 |
} |
} |
1080 |
|
|
1081 |
} while(truth); |
} while(truth); |
1082 |
|
|
1083 |
|
free_val(test); |
1084 |
|
free_val(loop); |
1085 |
|
} |
1086 |
|
|
1087 |
|
/* For-loop */ |
1088 |
|
extern void sx_666f72(environment *env) { |
1089 |
|
|
1090 |
|
value *loop, *foo; |
1091 |
|
stackitem *iterator; |
1092 |
|
|
1093 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1094 |
|
printerr("Too Few Arguments"); |
1095 |
|
env->err=1; |
1096 |
|
return; |
1097 |
|
} |
1098 |
|
|
1099 |
|
if(env->head->next->item->type != list) { |
1100 |
|
printerr("Bad Argument Type"); |
1101 |
|
env->err=2; |
1102 |
|
return; |
1103 |
|
} |
1104 |
|
|
1105 |
|
loop= env->head->item; |
1106 |
|
loop->refcount++; |
1107 |
|
toss(env); if(env->err) return; |
1108 |
|
|
1109 |
|
foo= env->head->item; |
1110 |
|
foo->refcount++; |
1111 |
|
toss(env); if(env->err) return; |
1112 |
|
|
1113 |
|
iterator= foo->content.ptr; |
1114 |
|
|
1115 |
|
while(iterator!=NULL) { |
1116 |
|
push_val(env, iterator->item); |
1117 |
|
push_val(env, loop); |
1118 |
|
eval(env); if(env->err) return; |
1119 |
|
iterator= iterator->next; |
1120 |
|
} |
1121 |
|
|
1122 |
|
free_val(loop); |
1123 |
|
free_val(foo); |
1124 |
|
} |
1125 |
|
|
1126 |
|
/* 'to' */ |
1127 |
|
extern void to(environment *env) { |
1128 |
|
int i, start, ending; |
1129 |
|
stackitem *temp_head; |
1130 |
|
value *temp_val; |
1131 |
|
|
1132 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1133 |
|
printerr("Too Few Arguments"); |
1134 |
|
env->err=1; |
1135 |
|
return; |
1136 |
|
} |
1137 |
|
|
1138 |
|
if(env->head->item->type!=integer |
1139 |
|
|| env->head->next->item->type!=integer) { |
1140 |
|
printerr("Bad Argument Type"); |
1141 |
|
env->err=2; |
1142 |
|
return; |
1143 |
|
} |
1144 |
|
|
1145 |
|
ending= env->head->item->content.val; |
1146 |
|
toss(env); if(env->err) return; |
1147 |
|
start= env->head->item->content.val; |
1148 |
|
toss(env); if(env->err) return; |
1149 |
|
|
1150 |
|
temp_head= env->head; |
1151 |
|
env->head= NULL; |
1152 |
|
|
1153 |
|
if(ending>=start) { |
1154 |
|
for(i= ending; i>=start; i--) |
1155 |
|
push_int(env, i); |
1156 |
|
} else { |
1157 |
|
for(i= ending; i<=start; i++) |
1158 |
|
push_int(env, i); |
1159 |
|
} |
1160 |
|
|
1161 |
|
temp_val= malloc(sizeof(value)); |
1162 |
|
temp_val->content.ptr= env->head; |
1163 |
|
temp_val->refcount= 1; |
1164 |
|
temp_val->type= list; |
1165 |
|
env->head= temp_head; |
1166 |
|
push_val(env, temp_val); |
1167 |
|
} |
1168 |
|
|
1169 |
|
/* Read a string */ |
1170 |
|
extern void readline(environment *env) { |
1171 |
|
char in_string[101]; |
1172 |
|
|
1173 |
|
fgets(in_string, 100, stdin); |
1174 |
|
push_cstring(env, in_string); |
1175 |
|
} |
1176 |
|
|
1177 |
|
/* Read a value and place on stack */ |
1178 |
|
extern void read(environment *env) { |
1179 |
|
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%[\001-\377]"; |
1180 |
|
const char strform[]= "\"%[^\"]\"%[\001-\377]"; |
1181 |
|
const char intform[]= "%i%[\001-\377]"; |
1182 |
|
const char blankform[]= "%*[ \t]%[\001-\377]"; |
1183 |
|
const char ebrackform[]= "%*1[]]%[\001-\377]"; |
1184 |
|
const char semicform[]= "%*1[;]%[\001-\377]"; |
1185 |
|
const char bbrackform[]= "%*1[[]%[\001-\377]"; |
1186 |
|
|
1187 |
|
int itemp; |
1188 |
|
static int depth= 0; |
1189 |
|
char *rest, *match; |
1190 |
|
size_t inlength; |
1191 |
|
|
1192 |
|
if(env->in_string==NULL) { |
1193 |
|
readline(env); if(env->err) return; |
1194 |
|
|
1195 |
|
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |
1196 |
|
strcpy(env->in_string, env->head->item->content.ptr); |
1197 |
|
toss(env); if(env->err) return; |
1198 |
|
} |
1199 |
|
|
1200 |
|
inlength= strlen(env->in_string)+1; |
1201 |
|
match= malloc(inlength); |
1202 |
|
rest= malloc(inlength); |
1203 |
|
|
1204 |
|
if(sscanf(env->in_string, blankform, rest)) { |
1205 |
|
; |
1206 |
|
} else if(sscanf(env->in_string, intform, &itemp, rest) > 0) { |
1207 |
|
push_int(env, itemp); |
1208 |
|
} else if(sscanf(env->in_string, strform, match, rest) > 0) { |
1209 |
|
push_cstring(env, match); |
1210 |
|
} else if(sscanf(env->in_string, symbform, match, rest) > 0) { |
1211 |
|
push_sym(env, match); |
1212 |
|
} else if(sscanf(env->in_string, ebrackform, rest) > 0) { |
1213 |
|
pack(env); if(env->err) return; |
1214 |
|
if(depth!=0) depth--; |
1215 |
|
} else if(sscanf(env->in_string, semicform, rest) > 0) { |
1216 |
|
push_sym(env, ";"); |
1217 |
|
} else if(sscanf(env->in_string, bbrackform, rest) > 0) { |
1218 |
|
push_sym(env, "["); |
1219 |
|
depth++; |
1220 |
|
} else { |
1221 |
|
free(rest); |
1222 |
|
rest= NULL; |
1223 |
|
} |
1224 |
|
|
1225 |
|
free(env->in_string); |
1226 |
|
free(match); |
1227 |
|
|
1228 |
|
env->in_string= rest; |
1229 |
|
|
1230 |
|
if(depth) |
1231 |
|
return read(env); |
1232 |
} |
} |