local_variables

/*
 *  call-seq:
 *     local_variables    => array
 *  
 *  Returns the names of the current local variables.
 *     
 *     fred = 1
 *     for i in 1..10
 *        # ...
 *     end
 *     local_variables   #=> ["fred", "i"]
 */

static VALUE
rb_f_local_variables()
{
    ID *tbl;
    int n, i;
    VALUE ary = rb_ary_new();
    struct RVarmap *vars;

    tbl = ruby_scope->local_tbl;
    if (tbl) {
        n = *tbl++;
        for (i=2; i<n; i++) {  /* skip first 2 ($_ and $~) */
            if (!rb_is_local_id(tbl[i])) continue; /* skip flip states */
            rb_ary_push(ary, rb_str_new2(rb_id2name(tbl[i])));
        }
    }

    vars = ruby_dyna_vars;
    while (vars) {
        if (vars->id && rb_is_local_id(vars->id)) { /* skip $_, $~ and flip states */
            rb_ary_push(ary, rb_str_new2(rb_id2name(vars->id)));
        }
        vars = vars->next;
    }

    return ary;
}