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17 lines
480 B
Plaintext
17 lines
480 B
Plaintext
// If first char is '(', remove first and last
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// FIXME: check if last matches
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String.unpar
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: ∀(fst: Char)
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∀(lst: Char)
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∀(str: String)
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String
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= λfst λlst λstr
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let P = λx(String)
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let cons = λhead λtail
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let P = λx∀(head:Char)∀(tail:String)String
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let true = λheadλtail(String.begin tail)
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let false = λheadλtail(String.cons head tail)
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((~(Char.equal head fst) P true false) head tail)
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let nil = String.nil
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(~str P cons nil)
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