43 lines
669 B
Haskell
43 lines
669 B
Haskell
module Operators where
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data Op =
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Op Int Fixity
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deriving (Show, Eq)
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data ArgKind
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= X
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| Y
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deriving (Show, Eq)
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data Fixity
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= Infix ArgKind ArgKind
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| Prefix ArgKind
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| Suffix ArgKind
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deriving (Show, Eq)
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isPrefix (Prefix _) = True
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isPrefix _ = False
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numArgs :: Op -> Int
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numArgs (Op _ f) = go f
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where
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go (Infix _ _) = 2
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go _ = 1
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type Ops = [(String, Op)]
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xfx, xfy, yfx, fx, fy, xf, yf :: String -> Int -> (String, Op)
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xfx o p = (o, Op p (Infix X X))
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xfy o p = (o, Op p (Infix X Y))
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yfx o p = (o, Op p (Infix Y X))
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fx o p = (o, Op p (Prefix X))
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fy o p = (o, Op p (Prefix Y))
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xf o p = (o, Op p (Suffix X))
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yf o p = (o, Op p (Suffix Y))
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