adamc@834: fun exec [m ::: Type -> Type] (_ : monad m) [ts ::: {Type}] r (fd : folder ts) =
adamc@834:     foldR [m] [fn ts => m $ts]
adamc@834:     (fn [nm :: Name] [v :: Type] [rest :: {Type}] [[nm] ~ rest] action acc =>
adamc@834:         this <- action;
adamc@834:         others <- acc;
adamc@834:         return ({nm = this} ++ others))
adamc@834:     (return {}) [ts] fd r
adamc@898: 
adamc@898: fun ignore [m ::: Type -> Type] (_ : monad m) [t] (v : m t) = x <- v; return ()
adamc@905: 
adamc@917: fun mp [m] (_ : monad m) [a] [b] f m =
adamc@917:     v <- m;
adamc@917:     return (f v)
adamc@917: 
adamc@905: fun foldR [K] [m] (_ : monad m) [tf :: K -> Type] [tr :: {K} -> Type]
adamc@905:           (f : nm :: Name -> t :: K -> rest :: {K}
adamc@905:                -> [[nm] ~ rest] =>
adamc@905:            tf t -> tr rest -> m (tr ([nm = t] ++ rest)))
adamc@905:           (i : tr []) [r :: {K}] (fl : folder r) =
adamc@905:     Top.fold [fn r :: {K} => $(map tf r) -> m (tr r)]
adamc@905:              (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] 
adamc@905:                               (acc : _ -> m (tr rest)) r =>
adamc@905:                  acc' <- acc (r -- nm);
adamc@905:                  f [nm] [t] [rest] ! r.nm acc')
adamc@905:              (fn _ => return i)
adamc@905:              [_] fl
adamc@905: 
adamc@905: fun foldR2 [K] [m] (_ : monad m) [tf1 :: K -> Type] [tf2 :: K -> Type] [tr :: {K} -> Type]
adamc@905:            (f : nm :: Name -> t :: K -> rest :: {K}
adamc@905:                 -> [[nm] ~ rest] =>
adamc@905:             tf1 t -> tf2 t -> tr rest -> m (tr ([nm = t] ++ rest)))
adamc@905:            (i : tr []) [r :: {K}] (fl : folder r) =
adamc@905:     Top.fold [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> m (tr r)]
adamc@905:        (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] 
adamc@905:                         (acc : _ -> _ -> m (tr rest)) r1 r2 =>
adamc@905:            acc' <- acc (r1 -- nm) (r2 -- nm);
adamc@905:            f [nm] [t] [rest] ! r1.nm r2.nm acc')
adamc@905:        (fn _ _ => return i)
adamc@905:        [_] fl
adamc@905: 
adamc@910: fun foldR3 [K] [m] (_ : monad m) [tf1 :: K -> Type] [tf2 :: K -> Type] [tf3 :: K -> Type] [tr :: {K} -> Type]
adamc@910:            (f : nm :: Name -> t :: K -> rest :: {K}
adamc@910:                 -> [[nm] ~ rest] =>
adamc@910:             tf1 t -> tf2 t -> tf3 t -> tr rest -> m (tr ([nm = t] ++ rest)))
adamc@910:            (i : tr []) [r :: {K}] (fl : folder r) =
adamc@910:     Top.fold [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> $(map tf3 r) -> m (tr r)]
adamc@910:        (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] 
adamc@910:                         (acc : _ -> _ -> _ -> m (tr rest)) r1 r2 r3 =>
adamc@910:            acc' <- acc (r1 -- nm) (r2 -- nm) (r3 -- nm);
adamc@910:            f [nm] [t] [rest] ! r1.nm r2.nm r3.nm acc')
adamc@910:        (fn _ _ _ => return i)
adamc@910:        [_] fl
adamc@910: 
adamc@905: fun mapR [K] [m] (_ : monad m) [tf :: K -> Type] [tr :: K -> Type]
adamc@905:          (f : nm :: Name -> t :: K -> tf t -> m (tr t)) =
adamc@905:     @@foldR [m] _ [tf] [fn r => $(map tr r)]
adamc@905:     (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] (v : tf t)
adamc@905:                      (acc : $(map tr rest)) =>
adamc@905:         v' <- f [nm] [t] v;
adamc@905:         return (acc ++ {nm = v'}))
adamc@905:     {}
adamc@937: 
adamc@937: fun mapR2 [K] [m] (_ : monad m) [tf1 :: K -> Type] [tf2 :: K -> Type] [tr :: K -> Type]
adamc@937:          (f : nm :: Name -> t :: K -> tf1 t -> tf2 t -> m (tr t)) =
adamc@937:     @@foldR2 [m] _ [tf1] [tf2] [fn r => $(map tr r)]
adamc@937:     (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] (v1 : tf1 t) (v2 : tf2 t)
adamc@937:                      (acc : $(map tr rest)) =>
adamc@937:         v' <- f [nm] [t] v1 v2;
adamc@937:         return (acc ++ {nm = v'}))
adamc@937:     {}