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#include <stdlib.h>
#include <stdio.h>
#include "precedent.h"
#include "hashtable.h"
#include "parse.h"
hashtable_t* ht;
int main() {
sym_t* finalSymbol = parse_symbol_final("store(print(hello;) myFunc;) myFunc()");
printf("drawing program:\n");
write_symbol_visual(finalSymbol, 0);
printf("\nexecuting program:\n");
ht = init_hashtable(1000);
eval(finalSymbol);
return 0;
}
/* TODO: read base hashtable from file to allow modularity
pair value value? */
void exec_all(symset_t symset) {
for (int i = 0; i < symset.count; i++) {
/* dispose of result */
eval(symset.symbols[i]);
}
}
void* eval(sym_t* symbol) {
if (symbol->province == LITERAL) {
return symbol->name;
}
else if (symbol->province == KEY_REF) {
void* ir = try_eval_internal(symbol);
if (ir != NULL) {
return ir;
}
else {
/* not an internal function, search hashtable for
next symbol */
/* TODO: scope */
pair_t* p = hashtable_get_pair(ht, (char*)symbol->name);
if (p != NULL) {
return eval((sym_t*)p->value);
}
else {
return NULL;
}
}
}
else {
return NULL;
}
}
/* internal functions?
this function has side-effects */
void* try_eval_internal(sym_t* symbol) {
unsigned int hash = get_hash((char*)symbol->name);
if (hash == get_hash("root")) {
/* execute all args as roots */
symset_t symset;
symset.symbols = symbol->args;
symset.count = symbol->argCount;
exec_all(symset);
return (void*)1;
}
else if (hash == get_hash("store")) {
/* TODO: scope */
/* first arg is value, remaining args are names */
/* TODO: recursion for multiple pairs */
char* key = (char*)eval(symbol->args[1]);
sym_t* value = symbol->args[0];
pair_t* p = init_pair(key, (void*)value);
hashtable_add_pair(ht, p);
return (void*)1;
}
else if (hash == get_hash("print")) {
/* TODO: genericize printf type */
printf("%s\n", (char*)eval(symbol->args[0]));
return (void*)1;
}
else {
return NULL;
}
}
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