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annotate lib/ur/monad.ur @ 1169:420e38516dc2

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author Adam Chlipala <adamc@hcoop.net>
date Thu, 25 Feb 2010 15:08:52 -0500
parents 8d3aa6c7cee0
children ad15700272f6
rev   line source
adamc@834 1 fun exec [m ::: Type -> Type] (_ : monad m) [ts ::: {Type}] r (fd : folder ts) =
adamc@1093 2 @foldR [m] [fn ts => m $ts]
adamc@1093 3 (fn [nm :: Name] [v :: Type] [rest :: {Type}] [[nm] ~ rest] action acc =>
adamc@1093 4 this <- action;
adamc@1093 5 others <- acc;
adamc@1093 6 return ({nm = this} ++ others))
adamc@1093 7 (return {}) fd r
adamc@898 8
adamc@898 9 fun ignore [m ::: Type -> Type] (_ : monad m) [t] (v : m t) = x <- v; return ()
adamc@905 10
adamc@917 11 fun mp [m] (_ : monad m) [a] [b] f m =
adamc@917 12 v <- m;
adamc@917 13 return (f v)
adamc@917 14
adamc@905 15 fun foldR [K] [m] (_ : monad m) [tf :: K -> Type] [tr :: {K} -> Type]
adamc@905 16 (f : nm :: Name -> t :: K -> rest :: {K}
adamc@905 17 -> [[nm] ~ rest] =>
adamc@905 18 tf t -> tr rest -> m (tr ([nm = t] ++ rest)))
adamc@1093 19 (i : tr []) [r ::: {K}] (fl : folder r) =
adamc@1093 20 @Top.fold [fn r :: {K} => $(map tf r) -> m (tr r)]
adamc@1093 21 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest]
adamc@1093 22 (acc : _ -> m (tr rest)) r =>
adamc@1093 23 acc' <- acc (r -- nm);
adamc@1093 24 f [nm] [t] [rest] ! r.nm acc')
adamc@1093 25 (fn _ => return i)
adamc@1093 26 fl
adamc@905 27
adamc@905 28 fun foldR2 [K] [m] (_ : monad m) [tf1 :: K -> Type] [tf2 :: K -> Type] [tr :: {K} -> Type]
adamc@905 29 (f : nm :: Name -> t :: K -> rest :: {K}
adamc@905 30 -> [[nm] ~ rest] =>
adamc@905 31 tf1 t -> tf2 t -> tr rest -> m (tr ([nm = t] ++ rest)))
adamc@1093 32 (i : tr []) [r ::: {K}] (fl : folder r) =
adamc@1093 33 @Top.fold [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> m (tr r)]
adamc@1093 34 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest]
adamc@1093 35 (acc : _ -> _ -> m (tr rest)) r1 r2 =>
adamc@1093 36 acc' <- acc (r1 -- nm) (r2 -- nm);
adamc@1093 37 f [nm] [t] [rest] ! r1.nm r2.nm acc')
adamc@1093 38 (fn _ _ => return i)
adamc@1093 39 fl
adamc@905 40
adamc@910 41 fun foldR3 [K] [m] (_ : monad m) [tf1 :: K -> Type] [tf2 :: K -> Type] [tf3 :: K -> Type] [tr :: {K} -> Type]
adamc@910 42 (f : nm :: Name -> t :: K -> rest :: {K}
adamc@910 43 -> [[nm] ~ rest] =>
adamc@910 44 tf1 t -> tf2 t -> tf3 t -> tr rest -> m (tr ([nm = t] ++ rest)))
adamc@1093 45 (i : tr []) [r ::: {K}] (fl : folder r) =
adamc@1093 46 @Top.fold [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> $(map tf3 r) -> m (tr r)]
adamc@1093 47 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest]
adamc@1093 48 (acc : _ -> _ -> _ -> m (tr rest)) r1 r2 r3 =>
adamc@1093 49 acc' <- acc (r1 -- nm) (r2 -- nm) (r3 -- nm);
adamc@1093 50 f [nm] [t] [rest] ! r1.nm r2.nm r3.nm acc')
adamc@1093 51 (fn _ _ _ => return i)
adamc@1093 52 fl
adamc@910 53
adamc@905 54 fun mapR [K] [m] (_ : monad m) [tf :: K -> Type] [tr :: K -> Type]
adamc@905 55 (f : nm :: Name -> t :: K -> tf t -> m (tr t)) =
adamc@905 56 @@foldR [m] _ [tf] [fn r => $(map tr r)]
adamc@905 57 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] (v : tf t)
adamc@905 58 (acc : $(map tr rest)) =>
adamc@905 59 v' <- f [nm] [t] v;
adamc@905 60 return (acc ++ {nm = v'}))
adamc@905 61 {}
adamc@937 62
adamc@937 63 fun mapR2 [K] [m] (_ : monad m) [tf1 :: K -> Type] [tf2 :: K -> Type] [tr :: K -> Type]
adamc@937 64 (f : nm :: Name -> t :: K -> tf1 t -> tf2 t -> m (tr t)) =
adamc@937 65 @@foldR2 [m] _ [tf1] [tf2] [fn r => $(map tr r)]
adamc@937 66 (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] (v1 : tf1 t) (v2 : tf2 t)
adamc@937 67 (acc : $(map tr rest)) =>
adamc@937 68 v' <- f [nm] [t] v1 v2;
adamc@937 69 return (acc ++ {nm = v'}))
adamc@937 70 {}