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#include <stdlib.h>
#include <string.h>
#include "symtab.h"
struct symtab* symtab_make() {
struct symtab *symtab = malloc(sizeof(struct symtab));
symtab->parent = NULL;
symtab->cap = 16;
symtab->len = 0;
symtab->syms = malloc(symtab->cap * sizeof(struct symbol*));
return symtab;
}
void symtab_delete_recursive(struct symtab *symtab) {
free(symtab->syms);
struct symtab *parent = symtab->parent;
free(symtab);
if (parent) symtab_delete_recursive(parent);
}
struct symbol* symtab_find(const struct symtab *symtab, const char *name) {
struct symbol *sym = symtab_find_local(symtab, name);
if (sym) return sym;
else if (symtab->parent) return symtab_find(symtab->parent, name);
else return NULL;
}
struct symbol* symtab_find_local(const struct symtab *symtab, const char *name) {
for (int i = 0; i < symtab->len; i++) {
if (strcmp(symtab->syms[i]->name, name) == 0) return symtab->syms[i];
}
return NULL;
}
void symtab_insert(struct symtab *symtab, struct symbol *sym) {
if (symtab->len == symtab->cap) {
symtab->cap *= 2;
symtab->syms = realloc(symtab->syms, symtab->cap * sizeof(struct symbol*));
}
symtab->syms[symtab->len++] = sym;
}
struct symtab* symtab_root(struct symtab *symtab) {
if (symtab->parent) return symtab_root(symtab->parent);
else return symtab;
}
struct symtab* symtab_sub(struct symtab *symtab) {
struct symtab *sub = symtab_make();
sub->parent = symtab;
return sub;
}
struct symtab* symtab_delete_get_parent(struct symtab *symtab) {
struct symtab *parent = symtab->parent;
symtab->parent = NULL;
symtab_delete_recursive(symtab);
return parent;
}
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