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++) |
156 |
} |
} |
157 |
|
|
158 |
/* Generic push function. */ |
/* Generic push function. */ |
159 |
void push(stackitem** stack_head, stackitem* in_item) |
void push(environment *env, stackitem* in_item) |
160 |
{ |
{ |
161 |
in_item->next= *stack_head; |
in_item->next= env->head; |
162 |
*stack_head= in_item; |
env->head= in_item; |
163 |
} |
} |
164 |
|
|
165 |
/* Push a value onto the stack */ |
/* Push a value onto the stack */ |
166 |
void push_val(stackitem **stack_head, value *val) |
void push_val(environment *env, value *val) |
167 |
{ |
{ |
168 |
stackitem *new_item= malloc(sizeof(stackitem)); |
stackitem *new_item= malloc(sizeof(stackitem)); |
169 |
new_item->item= val; |
new_item->item= val; |
170 |
val->refcount++; |
val->refcount++; |
171 |
push(stack_head, new_item); |
push(env, new_item); |
172 |
} |
} |
173 |
|
|
174 |
/* Push an integer onto the stack. */ |
/* Push an integer onto the stack. */ |
175 |
void push_int(stackitem **stack_head, int in_val) |
void push_int(environment *env, int in_val) |
176 |
{ |
{ |
177 |
value *new_value= malloc(sizeof(value)); |
value *new_value= malloc(sizeof(value)); |
178 |
stackitem *new_item= malloc(sizeof(stackitem)); |
stackitem *new_item= malloc(sizeof(stackitem)); |
182 |
new_value->type= integer; |
new_value->type= integer; |
183 |
new_value->refcount=1; |
new_value->refcount=1; |
184 |
|
|
185 |
push(stack_head, new_item); |
push(env, new_item); |
186 |
} |
} |
187 |
|
|
188 |
/* Copy a string onto the stack. */ |
/* Copy a string onto the stack. */ |
189 |
void push_cstring(stackitem **stack_head, const char *in_string) |
void push_cstring(environment *env, const char *in_string) |
190 |
{ |
{ |
191 |
value *new_value= malloc(sizeof(value)); |
value *new_value= malloc(sizeof(value)); |
192 |
stackitem *new_item= malloc(sizeof(stackitem)); |
stackitem *new_item= malloc(sizeof(stackitem)); |
197 |
new_value->type= string; |
new_value->type= string; |
198 |
new_value->refcount=1; |
new_value->refcount=1; |
199 |
|
|
200 |
push(stack_head, new_item); |
push(env, new_item); |
201 |
} |
} |
202 |
|
|
203 |
/* Mangle a symbol name to a valid C identifier name */ |
/* Mangle a symbol name to a valid C identifier name */ |
246 |
new_value->type= string; |
new_value->type= string; |
247 |
new_value->refcount=1; |
new_value->refcount=1; |
248 |
|
|
249 |
push_val(&(env->head), new_value); |
push_val(env, new_value); |
250 |
} |
} |
251 |
|
|
252 |
/* Push a symbol onto the stack. */ |
/* Push a symbol onto the stack. */ |
313 |
new_fvalue->refcount= 1; |
new_fvalue->refcount= 1; |
314 |
} |
} |
315 |
} |
} |
316 |
push(&(env->head), new_item); |
push(env, new_item); |
317 |
} |
} |
318 |
|
|
319 |
/* Print newline. */ |
/* Print newline. */ |
477 |
} |
} |
478 |
toss(env); /* toss the symbol */ |
toss(env); /* toss the symbol */ |
479 |
if(env->err) return; |
if(env->err) return; |
480 |
push_val(&(env->head), val); /* Return its bound value */ |
push_val(env, val); /* Return its bound value */ |
481 |
} |
} |
482 |
|
|
|
void stack_read(environment*, char*); |
|
|
|
|
483 |
/* 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 |
484 |
function value, and if it is, toss the symbol and execute the |
function value, and if it is, toss the symbol and execute the |
485 |
function. */ |
function. */ |
488 |
funcp in_func; |
funcp in_func; |
489 |
value* temp_val; |
value* temp_val; |
490 |
stackitem* iterator; |
stackitem* iterator; |
|
char* temp_string; |
|
491 |
|
|
492 |
if(env->head==NULL) { |
if(env->head==NULL) { |
493 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
495 |
return; |
return; |
496 |
} |
} |
497 |
|
|
498 |
|
eval_start: |
499 |
|
|
500 |
switch(env->head->item->type) { |
switch(env->head->item->type) { |
501 |
/* if it's a symbol */ |
/* if it's a symbol */ |
502 |
case symb: |
case symb: |
503 |
rcl(env); /* get its contents */ |
rcl(env); /* get its contents */ |
504 |
if(env->err) return; |
if(env->err) return; |
505 |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
if(env->head->item->type!=symb){ /* don't recurse symbols */ |
506 |
return eval(env); /* evaluate the value */ |
goto eval_start; |
507 |
} |
} |
508 |
return; |
return; |
509 |
|
|
522 |
if(env->err) return; |
if(env->err) return; |
523 |
iterator= (stackitem*)temp_val->content.ptr; |
iterator= (stackitem*)temp_val->content.ptr; |
524 |
while(iterator!=NULL) { |
while(iterator!=NULL) { |
525 |
push_val(&(env->head), iterator->item); |
push_val(env, iterator->item); |
526 |
if(env->head->item->type==symb |
if(env->head->item->type==symb |
527 |
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) { |
528 |
toss(env); |
toss(env); |
529 |
if(env->err) return; |
if(env->err) return; |
530 |
if(iterator->next == NULL){ |
if(iterator->next == NULL){ |
531 |
free_val(temp_val); |
free_val(temp_val); |
532 |
return eval(env); |
goto eval_start; |
533 |
} |
} |
534 |
eval(env); |
eval(env); |
535 |
if(env->err) return; |
if(env->err) return; |
539 |
free_val(temp_val); |
free_val(temp_val); |
540 |
return; |
return; |
541 |
|
|
542 |
/* 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: |
|
543 |
return; |
return; |
544 |
} |
} |
545 |
} |
} |
610 |
temp= malloc(sizeof(stackitem)); |
temp= malloc(sizeof(stackitem)); |
611 |
temp->item= pack; |
temp->item= pack; |
612 |
|
|
613 |
push(&(env->head), temp); |
push(env, temp); |
614 |
rev(env); |
rev(env); |
615 |
} |
} |
616 |
|
|
|
/* 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); |
|
|
} |
|
|
|
|
617 |
/* Relocate elements of the list on the stack. */ |
/* Relocate elements of the list on the stack. */ |
618 |
extern void expand(environment *env) |
extern void expand(environment *env) |
619 |
{ |
{ |
670 |
result= (left==right); |
result= (left==right); |
671 |
|
|
672 |
toss(env); toss(env); |
toss(env); toss(env); |
673 |
push_int(&(env->head), result); |
push_int(env, result); |
674 |
} |
} |
675 |
|
|
676 |
/* Negates the top element on the stack. */ |
/* Negates the top element on the stack. */ |
692 |
|
|
693 |
val= env->head->item->content.val; |
val= env->head->item->content.val; |
694 |
toss(env); |
toss(env); |
695 |
push_int(&(env->head), !val); |
push_int(env, !val); |
696 |
} |
} |
697 |
|
|
698 |
/* 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 |
798 |
|
|
799 |
/* Returns the current error number to the stack */ |
/* Returns the current error number to the stack */ |
800 |
extern void errn(environment *env){ |
extern void errn(environment *env){ |
801 |
push_int(&(env->head), env->err); |
push_int(env, env->err); |
802 |
} |
} |
803 |
|
|
804 |
|
extern void read(environment*); |
805 |
|
|
806 |
int main() |
int main() |
807 |
{ |
{ |
808 |
environment myenv; |
environment myenv; |
|
char in_string[100]; |
|
809 |
|
|
810 |
init_env(&myenv); |
init_env(&myenv); |
811 |
|
|
812 |
printf("okidok\n "); |
while(1) { |
813 |
|
if(myenv.in_string==NULL) |
814 |
while(fgets(in_string, 100, stdin) != NULL) { |
printstack(&myenv); |
815 |
stack_read(&myenv, in_string); |
read(&myenv); |
816 |
if(myenv.err) { |
if(myenv.err) { |
817 |
printf("(error %d) ", myenv.err); |
printf("(error %d) ", myenv.err); |
818 |
myenv.err=0; |
myenv.err=0; |
819 |
|
} else if(myenv.head!=NULL |
820 |
|
&& myenv.head->item->type==symb |
821 |
|
&& ((symbol*)(myenv.head->item->content.ptr))->id[0]==';') { |
822 |
|
toss(&myenv); /* No error check in main */ |
823 |
|
eval(&myenv); |
824 |
} |
} |
|
printf("okidok\n "); |
|
825 |
} |
} |
826 |
quit(&myenv); |
quit(&myenv); |
827 |
return EXIT_FAILURE; |
return EXIT_FAILURE; |
853 |
strcpy(new_string, b_val->content.ptr); |
strcpy(new_string, b_val->content.ptr); |
854 |
strcat(new_string, a_val->content.ptr); |
strcat(new_string, a_val->content.ptr); |
855 |
free_val(a_val); free_val(b_val); |
free_val(a_val); free_val(b_val); |
856 |
push_cstring(&(env->head), new_string); |
push_cstring(env, new_string); |
857 |
free(new_string); |
free(new_string); |
858 |
return; |
return; |
859 |
} |
} |
873 |
b=env->head->item->content.val; |
b=env->head->item->content.val; |
874 |
toss(env); |
toss(env); |
875 |
if(env->err) return; |
if(env->err) return; |
876 |
push_int(&(env->head), a+b); |
push_int(env, a+b); |
877 |
} |
} |
878 |
} |
} |
879 |
|
|
902 |
b=env->head->item->content.val; |
b=env->head->item->content.val; |
903 |
toss(env); |
toss(env); |
904 |
if(env->err) return; |
if(env->err) return; |
905 |
push_int(&(env->head), b-a); |
push_int(env, b-a); |
906 |
} |
} |
907 |
} |
} |
908 |
|
|
931 |
b=env->head->item->content.val; |
b=env->head->item->content.val; |
932 |
toss(env); |
toss(env); |
933 |
if(env->err) return; |
if(env->err) return; |
934 |
push_int(&(env->head), b>a); |
push_int(env, b>a); |
935 |
} |
} |
936 |
} |
} |
937 |
|
|
987 |
env->err=1; |
env->err=1; |
988 |
return; |
return; |
989 |
} |
} |
990 |
push_val(&(env->head), copy_val(env->head->item)); |
push_val(env, copy_val(env->head->item)); |
991 |
} |
} |
992 |
|
|
993 |
/* "if", If-Then */ |
/* "if", If-Then */ |
1061 |
extern void sx_7768696c65(environment *env) { |
extern void sx_7768696c65(environment *env) { |
1062 |
|
|
1063 |
int truth; |
int truth; |
1064 |
|
value *loop, *test; |
1065 |
|
|
1066 |
if((env->head)==NULL || env->head->next==NULL) { |
if((env->head)==NULL || env->head->next==NULL) { |
1067 |
printerr("Too Few Arguments"); |
printerr("Too Few Arguments"); |
1069 |
return; |
return; |
1070 |
} |
} |
1071 |
|
|
1072 |
|
loop= env->head->item; |
1073 |
|
loop->refcount++; |
1074 |
|
toss(env); if(env->err) return; |
1075 |
|
|
1076 |
|
test= env->head->item; |
1077 |
|
test->refcount++; |
1078 |
|
toss(env); if(env->err) return; |
1079 |
|
|
1080 |
do { |
do { |
1081 |
swap(env); if(env->err) return; |
push_val(env, test); |
1082 |
dup(env); if(env->err) return; |
eval(env); |
|
eval(env); if(env->err) return; |
|
1083 |
|
|
1084 |
if(env->head->item->type != integer) { |
if(env->head->item->type != integer) { |
1085 |
printerr("Bad Argument Type"); |
printerr("Bad Argument Type"); |
1088 |
} |
} |
1089 |
|
|
1090 |
truth= env->head->item->content.val; |
truth= env->head->item->content.val; |
|
|
|
1091 |
toss(env); if(env->err) return; |
toss(env); if(env->err) return; |
|
swap(env); if(env->err) return; |
|
1092 |
|
|
1093 |
if(truth) { |
if(truth) { |
1094 |
dup(env); |
push_val(env, loop); |
1095 |
eval(env); |
eval(env); |
1096 |
} else { |
} else { |
1097 |
toss(env); |
toss(env); |
|
toss(env); |
|
1098 |
} |
} |
1099 |
|
|
1100 |
} while(truth); |
} while(truth); |
1101 |
|
|
1102 |
|
free_val(test); |
1103 |
|
free_val(loop); |
1104 |
|
} |
1105 |
|
|
1106 |
|
/* For-loop */ |
1107 |
|
extern void sx_666f72(environment *env) { |
1108 |
|
|
1109 |
|
value *loop, *foo; |
1110 |
|
stackitem *iterator; |
1111 |
|
|
1112 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1113 |
|
printerr("Too Few Arguments"); |
1114 |
|
env->err=1; |
1115 |
|
return; |
1116 |
|
} |
1117 |
|
|
1118 |
|
if(env->head->next->item->type != list) { |
1119 |
|
printerr("Bad Argument Type"); |
1120 |
|
env->err=2; |
1121 |
|
return; |
1122 |
|
} |
1123 |
|
|
1124 |
|
loop= env->head->item; |
1125 |
|
loop->refcount++; |
1126 |
|
toss(env); if(env->err) return; |
1127 |
|
|
1128 |
|
foo= env->head->item; |
1129 |
|
foo->refcount++; |
1130 |
|
toss(env); if(env->err) return; |
1131 |
|
|
1132 |
|
iterator= foo->content.ptr; |
1133 |
|
|
1134 |
|
while(iterator!=NULL) { |
1135 |
|
push_val(env, iterator->item); |
1136 |
|
push_val(env, loop); |
1137 |
|
eval(env); if(env->err) return; |
1138 |
|
iterator= iterator->next; |
1139 |
|
} |
1140 |
|
|
1141 |
|
free_val(loop); |
1142 |
|
free_val(foo); |
1143 |
|
} |
1144 |
|
|
1145 |
|
/* 'to' */ |
1146 |
|
extern void to(environment *env) { |
1147 |
|
int i, start, ending; |
1148 |
|
|
1149 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1150 |
|
printerr("Too Few Arguments"); |
1151 |
|
env->err=1; |
1152 |
|
return; |
1153 |
|
} |
1154 |
|
|
1155 |
|
if(env->head->item->type!=integer |
1156 |
|
|| env->head->next->item->type!=integer) { |
1157 |
|
printerr("Bad Argument Type"); |
1158 |
|
env->err=2; |
1159 |
|
return; |
1160 |
|
} |
1161 |
|
|
1162 |
|
ending= env->head->item->content.val; |
1163 |
|
toss(env); if(env->err) return; |
1164 |
|
start= env->head->item->content.val; |
1165 |
|
toss(env); if(env->err) return; |
1166 |
|
|
1167 |
|
push_sym(env, "["); |
1168 |
|
|
1169 |
|
if(ending>=start) { |
1170 |
|
for(i= start; i<=ending; i++) |
1171 |
|
push_int(env, i); |
1172 |
|
} else { |
1173 |
|
for(i= start; i>=ending; i--) |
1174 |
|
push_int(env, i); |
1175 |
|
} |
1176 |
|
|
1177 |
|
push_sym(env, "["); |
1178 |
|
pack(env); if(env->err) return; |
1179 |
|
} |
1180 |
|
|
1181 |
|
/* Read a string */ |
1182 |
|
extern void readline(environment *env) { |
1183 |
|
char in_string[101]; |
1184 |
|
|
1185 |
|
fgets(in_string, 100, stdin); |
1186 |
|
push_cstring(env, in_string); |
1187 |
|
} |
1188 |
|
|
1189 |
|
/* Read a value and place on stack */ |
1190 |
|
extern void read(environment *env) { |
1191 |
|
const char symbform[]= "%[a-zA-Z0-9!$%*+./:<=>?@^_~-]%[\001-\377]"; |
1192 |
|
const char strform[]= "\"%[^\"]\"%[\001-\377]"; |
1193 |
|
const char intform[]= "%i%[\001-\377]"; |
1194 |
|
const char blankform[]= "%*[ \t]%[\001-\377]"; |
1195 |
|
const char ebrackform[]= "%*1[]]%[\001-\377]"; |
1196 |
|
const char semicform[]= "%*1[;]%[\001-\377]"; |
1197 |
|
const char bbrackform[]= "%*1[[]%[\001-\377]"; |
1198 |
|
|
1199 |
|
int itemp; |
1200 |
|
static int depth= 0; |
1201 |
|
char *rest, *match; |
1202 |
|
size_t inlength; |
1203 |
|
|
1204 |
|
if(env->in_string==NULL) { |
1205 |
|
readline(env); if(env->err) return; |
1206 |
|
|
1207 |
|
env->in_string= malloc(strlen(env->head->item->content.ptr)+1); |
1208 |
|
strcpy(env->in_string, env->head->item->content.ptr); |
1209 |
|
toss(env); if(env->err) return; |
1210 |
|
} |
1211 |
|
|
1212 |
|
inlength= strlen(env->in_string)+1; |
1213 |
|
match= malloc(inlength); |
1214 |
|
rest= malloc(inlength); |
1215 |
|
|
1216 |
|
if(sscanf(env->in_string, blankform, rest)) { |
1217 |
|
; |
1218 |
|
} else if(sscanf(env->in_string, intform, &itemp, rest) > 0) { |
1219 |
|
push_int(env, itemp); |
1220 |
|
} else if(sscanf(env->in_string, strform, match, rest) > 0) { |
1221 |
|
push_cstring(env, match); |
1222 |
|
} else if(sscanf(env->in_string, symbform, match, rest) > 0) { |
1223 |
|
push_sym(env, match); |
1224 |
|
} else if(sscanf(env->in_string, ebrackform, rest) > 0) { |
1225 |
|
push_sym(env, "["); |
1226 |
|
pack(env); if(env->err) return; |
1227 |
|
if(depth!=0) depth--; |
1228 |
|
} else if(sscanf(env->in_string, semicform, rest) > 0) { |
1229 |
|
push_sym(env, ";"); |
1230 |
|
} else if(sscanf(env->in_string, bbrackform, rest) > 0) { |
1231 |
|
push_sym(env, "["); |
1232 |
|
depth++; |
1233 |
|
} else { |
1234 |
|
free(rest); |
1235 |
|
rest= NULL; |
1236 |
|
} |
1237 |
|
|
1238 |
|
free(env->in_string); |
1239 |
|
free(match); |
1240 |
|
|
1241 |
|
env->in_string= rest; |
1242 |
|
|
1243 |
|
if(depth) |
1244 |
|
return read(env); |
1245 |
} |
} |