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13 lines
378 B
Plaintext
13 lines
378 B
Plaintext
Parser.repeat
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: ∀(n: Nat)
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∀(A: *)
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∀(p: (Parser A))
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(Parser (List A))
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= λn λA λp
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let P = λx (Parser (List A))
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let succ = λn.pred
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(Parser.bind A (List A) p λhead
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(Parser.bind (List A) (List A) (Parser.repeat n.pred A p) λtail
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(Parser.pure (List A) (List.cons A head tail))))
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let zero = (Parser.pure (List A) (List.nil A))
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(~n P succ zero) |