--- stack/stack.c 2002/02/01 23:30:55 1.18 +++ stack/stack.c 2002/02/02 18:36:19 1.23 @@ -160,7 +160,9 @@ else def_sym(in_hash, in_string); /* Make symbol */ - new_item->content.ptr= *hash(in_hash, in_string); /* XXX */ + new_item->content.ptr= *hash(in_hash, in_string); /* The new reference + shouldn't point at + NULL */ new_item->type= ref; } @@ -196,26 +198,30 @@ } /* Prints the top element of the stack. */ -void print_(stackitem** stack_head) +extern void print_(stackitem** stack_head) { - if((*stack_head)==NULL) { + stackitem* temp= *stack_head; + + if(temp==NULL) { printerr("Stack empty"); return; } - switch((*stack_head)->type) { + while(temp->type==ref) + temp= temp->content.ptr; + + switch(temp->type) { case value: - printf("%d", (*stack_head)->content.val); + printf("%d", temp->content.val); break; case string: - printf("%s", (char*)(*stack_head)->content.ptr); - break; - case ref: - printf("%s", ((stackitem*)(*stack_head)->content.ptr)->id); + printf("\"%s\"", (char*)temp->content.ptr); break; case symbol: + printf("%s", temp->id); + break; default: - printf("%p", (*stack_head)->content.ptr); + printf("%p", temp->content.ptr); break; } } @@ -243,7 +249,7 @@ { if(*stack_head != NULL) { print_st(*stack_head, 1); - printf("\n"); + nl(); } else { printerr("Stack empty"); } @@ -254,19 +260,60 @@ extern void eval(stackitem** stack_head) { funcp in_func; + stackitem* temp= *stack_head; - if((*stack_head)==NULL || (*stack_head)->type!=ref) { - printerr("Stack empty or not a reference"); + if(temp==NULL) { + printerr("Stack empty"); return; } - if(((stackitem*)(*stack_head)->content.ptr)->type==func) { - in_func= (funcp)((stackitem*)(*stack_head)->content.ptr)->content.ptr; + while(temp->type==ref) + temp= temp->content.ptr; + + if(temp->type==func) { + in_func= (funcp)(temp->content.ptr); toss(stack_head); (*in_func)(stack_head); return; - } else - printerr("Not a function"); + } + + printerr("Couldn't evaluate"); +} + +/* Make a list. */ +extern void pack(stackitem** stack_head) +{ + void* delimiter; + stackitem *iterator, *temp, *pack; + + if((*stack_head)==NULL) { + printerr("Stack empty"); + return; + } + + delimiter= (*stack_head)->content.ptr; /* Get delimiter */ + toss(stack_head); + + iterator= *stack_head; + + /* Search for first delimiter */ + while(iterator->next!=NULL && iterator->next->content.ptr!=delimiter) + iterator= iterator->next; + + /* Extract list */ + temp= *stack_head; + *stack_head= iterator->next; + iterator->next= NULL; + + if(*stack_head!=NULL && (*stack_head)->content.ptr==delimiter) + toss(stack_head); + + /* Push list */ + pack= malloc(sizeof(stackitem)); + pack->type= list; + pack->content.ptr= temp; + + push(stack_head, pack); } /* Parse input. */ @@ -276,6 +323,7 @@ int itemp; size_t inlength= strlen(in_line)+1; int convert= 0; + static int non_eval_flag= 0; temp= malloc(inlength); rest= malloc(inlength); @@ -298,14 +346,35 @@ break; } /* If symbol */ - if((convert= sscanf(in_line, "%[^ ;\n\r]%[^\n\r]", temp, rest))) { + if((convert= sscanf(in_line, "%[^][ ;\n\r]%[^\n\r]", temp, rest))) { push_ref(stack_head, in_hash, temp); break; } - /* If ';' */ - if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest)) && *temp==';') { - eval(stack_head); /* Evaluate top element */ - break; + /* If single char */ + if((convert= sscanf(in_line, "%c%[^\n\r]", temp, rest))) { + if(*temp==';') { + if(!non_eval_flag) { + eval(stack_head); /* Evaluate top element */ + break; + } + + push_ref(stack_head, in_hash, ";"); + break; + } + + if(*temp==']') { + push_ref(stack_head, in_hash, "["); + pack(stack_head); + if(non_eval_flag!=0) + non_eval_flag--; + break; + } + + if(*temp=='[') { + push_ref(stack_head, in_hash, "["); + non_eval_flag++; + break; + } } } while(0); @@ -323,42 +392,6 @@ return 1; } -/* Make a list. */ -extern void pack(stackitem** stack_head) -{ - void* delimiter; - stackitem *iterator, *temp, *pack; - - if((*stack_head)==NULL) { - printerr("Stack empty"); - return; - } - - delimiter= (*stack_head)->content.ptr; /* Get delimiter */ - toss(stack_head); - - iterator= *stack_head; - - /* Search for first delimiter */ - while(iterator->next!=NULL && iterator->next->content.ptr!=delimiter) - iterator= iterator->next; - - /* Extract list */ - temp= *stack_head; - *stack_head= iterator->next; - iterator->next= NULL; - - if(*stack_head!=NULL && (*stack_head)->content.ptr==delimiter) - toss(stack_head); - - /* Push list */ - pack= malloc(sizeof(stackitem)); - pack->type= list; - pack->content.ptr= temp; - - push(stack_head, pack); -} - /* Relocate elements of the list on the stack. */ extern void expand(stackitem** stack_head) {