Add boolean, comparison, and equality functions

src/special.c

@@ -105,3 +105,25 @@ struct ucl_object *ucl_special_progn(struct ucl_state *state, struct ucl_object
 struct ucl_object *ucl_special_quote(struct ucl_state *state, struct ucl_object *args) {
     return ucl_car(args);
 }
+
+struct ucl_object *ucl_special_and(struct ucl_state *state, struct ucl_object *args) {
+    struct ucl_object *value = ucl_t_create();
+    FOREACH_LIST(args, iter, form) {
+        value = ucl_evaluate(state, form);
+        if (!ucl_truthy_bool(value)) {
+            return value;
+        }
+    }
+    return value;
+}
+
+struct ucl_object *ucl_special_or(struct ucl_state *state, struct ucl_object *args) {
+    struct ucl_object *value = ucl_nil_create();
+    FOREACH_LIST(args, iter, form) {
+        value = ucl_evaluate(state, form);
+        if (ucl_truthy_bool(value)) {
+            return value;
+        }
+    }
+    return value;
+}