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45 lines
971 B
Idris
45 lines
971 B
Idris
module Text.Quantity
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%default total
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public export
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record Quantity where
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constructor Qty
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min : Nat
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max : Maybe Nat
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public export
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Show Quantity where
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show (Qty Z Nothing) = "*"
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show (Qty Z (Just (S Z))) = "?"
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show (Qty (S Z) Nothing) = "+"
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show (Qty min max) = "{" ++ show min ++ showMax ++ "}"
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where
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showMax : String
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showMax = case max of
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Nothing => ","
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Just max' => if min == max'
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then ""
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else "," ++ show max'
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public export
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between : Nat -> Nat -> Quantity
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between min max = Qty min (Just max)
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public export
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atLeast : Nat -> Quantity
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atLeast min = Qty min Nothing
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public export
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atMost : Nat -> Quantity
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atMost max = Qty 0 (Just max)
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public export
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exactly : Nat -> Quantity
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exactly n = Qty n (Just n)
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public export
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inOrder : Quantity -> Bool
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inOrder (Qty min Nothing) = True
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inOrder (Qty min (Just max)) = min <= max
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