abstract class engine
    method __init__ self
    list[str] boards

    class board
        engine host
        str id
        str name
        list[engine.post] threads
        method __init__ self host id
        method update   self

    class post
        engine.post &parent
        engine.post.hash tripcode
        str id
        str author
        str title
        str body
        bool sage
        datetime timestamp
        list[engine.post] children
        int children_count
        bool full
        method __init__ self id parent
        method update   self
        method new      cls parent body sage title author tripcode
          | sage: False
          | title: ""
          | author: ""
          | tripcode: ""