4 static struct Expr get_scope_value_impl(struct Expr scope, struct Expr name)
7 struct Expr value = assoc(name, scope.cons->car);
8 return nil_p(value) ? get_scope_value_impl(scope.cons->cdr, name) : value;
14 struct Expr get_scope_value(const struct Scope *scope, struct Expr name)
16 return get_scope_value_impl(scope->expr, name);
19 static struct Expr set_scope_value_impl(Gc *gc, struct Expr scope, struct Expr name, struct Expr value)
22 if (!nil_p(assoc(name, scope.cons->car)) || nil_p(scope.cons->cdr)) {
24 CONS(gc, CONS(gc, name, value), scope.cons->car),
29 set_scope_value_impl(gc, scope.cons->cdr, name, value));
33 CONS(gc, CONS(gc, name, value), NIL(gc)),
38 void set_scope_value(Gc *gc, struct Scope *scope, struct Expr name, struct Expr value)
40 scope->expr = set_scope_value_impl(gc, scope->expr, name, value);
43 void push_scope_frame(Gc *gc, struct Scope *scope, struct Expr vars, struct Expr args)
48 struct Expr frame = NIL(gc);
50 while(!nil_p(vars) && !nil_p(args)) {
52 CONS(gc, vars.cons->car, args.cons->car),
54 vars = vars.cons->cdr;
55 args = args.cons->cdr;
58 scope->expr = CONS(gc, frame, scope->expr);
61 void pop_scope_frame(Gc *gc, struct Scope *scope)
66 if (!nil_p(scope->expr)) {
67 scope->expr = scope->expr.cons->cdr;