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1 point by almkglor 6119 days ago | link | parent

The nice thing here too is that we completely lose the 'return structure. The current code keeps composing and decomposing it anyway. Hmm:

  (def filt (fun parser)
    (fn (remaining pass fail)
      (parser remaining
        (fn (parsed remaining actions)
          (pass (fun parsed) remaining actions))
        fail)))
If we assume that the base compiler isn't very optimizing (i.e. captures closures when it doesn't need to) we could use helper functions for new 'pass functions:

  (let new-pass
       (fn (fun pass)
         (fn (parsed remaining actions)
           (pass (fun parsed) remaining actions)))
    (def filt (fun parser)
      (fn (remaining pass fail)
        (parser remaining
                (new-pass fun pass)
                fail))))