Inconsistent formatting in ALTER TABLE statement

[Huliiiiii]

Input

ALTER TABLE "public"."event"
  DROP CONSTRAINT "validate_date",
  ADD CONSTRAINT "validate_date" CHECK (
    end_date IS NULL
    OR (start_date IS NOT NULL AND end_date > start_date)
  );

Actual Output

ALTER TABLE
  "public"."event"
  DROP CONSTRAINT "validate_date",
ADD
  CONSTRAINT "validate_date" CHECK (
    end_date IS NULL
    OR (
      start_date IS NOT NULL
      AND end_date > start_date
    )
  );

Expected Output

ALTER TABLE "public"."event"
  DROP CONSTRAINT "validate_date",
  ADD CONSTRAINT "validate_date" CHECK (
    end_date IS NULL
    OR (
      start_date IS NOT NULL
      AND end_date > start_date
    )
  );
-- or
ALTER TABLE
  "public"."event"
  DROP CONSTRAINT "validate_date",
  ADD CONSTRAINT "validate_date" 
    CHECK (
      end_date IS NULL
      OR (
        start_date IS NOT NULL
        AND end_date > start_date
      )
    );

[lu-zero]

It is related to #84, I'll get a fix for the tokenizer to recognize top level DROP/ALTER as well CREATE and leave the logic for DROP/ADD/ALTER less confusing. Then I'd love if others refine/add the list depending on the dialect.