48 |
typedef struct stackitem_struct |
typedef struct stackitem_struct |
49 |
{ |
{ |
50 |
value *item; /* The value on the stack */ |
value *item; /* The value on the stack */ |
51 |
|
/* (This is never NULL) */ |
52 |
struct stackitem_struct *next; /* Next item */ |
struct stackitem_struct *next; /* Next item */ |
53 |
} stackitem; |
} stackitem; |
54 |
|
|
361 |
printf("%d", stack_head->item->content.val); |
printf("%d", stack_head->item->content.val); |
362 |
break; |
break; |
363 |
case string: |
case string: |
364 |
printf("\"%s\"", (char*)stack_head->item->content.ptr); |
printf("%s", (char*)stack_head->item->content.ptr); |
365 |
break; |
break; |
366 |
case symb: |
case symb: |
367 |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
printf("%s", ((symbol *)(stack_head->item->content.ptr))->id); |
439 |
env->head->next= temp; |
env->head->next= temp; |
440 |
} |
} |
441 |
|
|
442 |
|
/* Rotate the first three elements on the stack. */ |
443 |
|
extern void rot(environment *env) |
444 |
|
{ |
445 |
|
stackitem *temp= env->head; |
446 |
|
|
447 |
|
if(env->head==NULL || env->head->next==NULL |
448 |
|
|| env->head->next->next==NULL) { |
449 |
|
printerr("Too Few Arguments"); |
450 |
|
env->err=1; |
451 |
|
return; |
452 |
|
} |
453 |
|
|
454 |
|
env->head= env->head->next->next; |
455 |
|
temp->next->next= env->head->next; |
456 |
|
env->head->next= temp; |
457 |
|
} |
458 |
|
|
459 |
/* Recall a value from a symbol, if bound */ |
/* Recall a value from a symbol, if bound */ |
460 |
extern void rcl(environment *env) |
extern void rcl(environment *env) |
461 |
{ |
{ |
1021 |
} |
} |
1022 |
push_val(&(env->head), copy_val(env->head->item)); |
push_val(&(env->head), copy_val(env->head->item)); |
1023 |
} |
} |
1024 |
|
|
1025 |
|
/* If-Then */ |
1026 |
|
extern void sx_6966(environment *env) { |
1027 |
|
|
1028 |
|
int truth; |
1029 |
|
|
1030 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1031 |
|
printerr("Too Few Arguments"); |
1032 |
|
env->err=1; |
1033 |
|
return; |
1034 |
|
} |
1035 |
|
|
1036 |
|
if(env->head->next->item->type != integer) { |
1037 |
|
printerr("Bad Argument Type"); |
1038 |
|
env->err=2; |
1039 |
|
return; |
1040 |
|
} |
1041 |
|
|
1042 |
|
swap(env); |
1043 |
|
if(env->err) return; |
1044 |
|
|
1045 |
|
truth=env->head->item->content.val; |
1046 |
|
|
1047 |
|
toss(env); |
1048 |
|
if(env->err) return; |
1049 |
|
|
1050 |
|
if(truth) |
1051 |
|
eval(env); |
1052 |
|
else |
1053 |
|
toss(env); |
1054 |
|
} |
1055 |
|
|
1056 |
|
/* If-Then-Else */ |
1057 |
|
extern void ifelse(environment *env) { |
1058 |
|
|
1059 |
|
int truth; |
1060 |
|
|
1061 |
|
if((env->head)==NULL || env->head->next==NULL |
1062 |
|
|| env->head->next->next==NULL) { |
1063 |
|
printerr("Too Few Arguments"); |
1064 |
|
env->err=1; |
1065 |
|
return; |
1066 |
|
} |
1067 |
|
|
1068 |
|
if(env->head->next->next->item->type != integer) { |
1069 |
|
printerr("Bad Argument Type"); |
1070 |
|
env->err=2; |
1071 |
|
return; |
1072 |
|
} |
1073 |
|
|
1074 |
|
rot(env); |
1075 |
|
if(env->err) return; |
1076 |
|
|
1077 |
|
truth=env->head->item->content.val; |
1078 |
|
|
1079 |
|
toss(env); |
1080 |
|
if(env->err) return; |
1081 |
|
|
1082 |
|
if(!truth) |
1083 |
|
swap(env); |
1084 |
|
if(env->err) return; |
1085 |
|
|
1086 |
|
toss(env); |
1087 |
|
if(env->err) return; |
1088 |
|
|
1089 |
|
eval(env); |
1090 |
|
} |
1091 |
|
|
1092 |
|
/* while */ |
1093 |
|
extern void sx_7768696c65(environment *env) { |
1094 |
|
|
1095 |
|
int truth; |
1096 |
|
|
1097 |
|
if((env->head)==NULL || env->head->next==NULL) { |
1098 |
|
printerr("Too Few Arguments"); |
1099 |
|
env->err=1; |
1100 |
|
return; |
1101 |
|
} |
1102 |
|
|
1103 |
|
do { |
1104 |
|
swap(env); if(env->err) return; |
1105 |
|
dup(env); if(env->err) return; |
1106 |
|
eval(env); if(env->err) return; |
1107 |
|
|
1108 |
|
if(env->head->item->type != integer) { |
1109 |
|
printerr("Bad Argument Type"); |
1110 |
|
env->err=2; |
1111 |
|
return; |
1112 |
|
} |
1113 |
|
|
1114 |
|
truth= env->head->item->content.val; |
1115 |
|
|
1116 |
|
toss(env); if(env->err) return; |
1117 |
|
swap(env); if(env->err) return; |
1118 |
|
|
1119 |
|
if(truth) { |
1120 |
|
dup(env); |
1121 |
|
eval(env); |
1122 |
|
} else { |
1123 |
|
toss(env); |
1124 |
|
toss(env); |
1125 |
|
} |
1126 |
|
|
1127 |
|
} while(truth); |
1128 |
|
} |