(** Row folding *) con folder = K ==> fn r :: {K} => tf :: ({K} -> Type) -> (nm :: Name -> v :: K -> r :: {K} -> tf r -> [[nm] ~ r] => tf ([nm = v] ++ r)) -> tf [] -> tf r structure Folder = struct fun fold K (r ::: {K}) (fl : folder r) = fl fun nil K (tf :: {K} -> Type) (f : nm :: Name -> v :: K -> r :: {K} -> tf r -> [[nm] ~ r] => tf ([nm = v] ++ r)) (i : tf []) = i fun cons K (r ::: {K}) (nm :: Name) (v :: K) [[nm] ~ r] (fold : folder r) (tf :: {K} -> Type) (f : nm :: Name -> v :: K -> r :: {K} -> tf r -> [[nm] ~ r] => tf ([nm = v] ++ r)) (i : tf []) = f [nm] [v] [r] (fold [tf] f i) ! fun concat K (r1 ::: {K}) (r2 ::: {K}) [r1 ~ r2] (f1 : folder r1) (f2 : folder r2) (tf :: {K} -> Type) (f : nm :: Name -> v :: K -> r :: {K} -> tf r -> [[nm] ~ r] => tf ([nm = v] ++ r)) (i : tf []) = f1 [fn r1' => [r1' ~ r2] => tf (r1' ++ r2)] (fn (nm :: Name) (v :: K) (r1' :: {K}) (acc : [r1' ~ r2] => tf (r1' ++ r2)) [[nm] ~ r1'] [[nm = v] ++ r1' ~ r2] => f [nm] [v] [r1' ++ r2] acc !) (fn [[] ~ r2] => f2 [tf] f i) ! fun mp K1 K2 (f ::: K1 -> K2) (r ::: {K1}) (fold : folder r) (tf :: {K2} -> Type) (f : nm :: Name -> v :: K2 -> r :: {K2} -> tf r -> [[nm] ~ r] => tf ([nm = v] ++ r)) (i : tf []) = fold [fn r => tf (map f r)] (fn (nm :: Name) (v :: K1) (rest :: {K1}) (acc : tf (map f rest)) [[nm] ~ rest] => f [nm] [f v] [map f rest] acc !) i end fun not b = if b then False else True con idT (t :: Type) = t con record (t :: {Type}) = $t con fst = K1 ==> K2 ==> fn t :: (K1 * K2) => t.1 con snd = K1 ==> K2 ==> fn t :: (K1 * K2) => t.2 con fst3 = K1 ==> K2 ==> K3 ==> fn t :: (K1 * K2 * K3) => t.1 con snd3 = K1 ==> K2 ==> K3 ==> fn t :: (K1 * K2 * K3) => t.2 con thd3 = K1 ==> K2 ==> K3 ==> fn t :: (K1 * K2 * K3) => t.3 con mapU = K ==> fn f :: K => map (fn _ :: Unit => f) con ex = fn tf :: (Type -> Type) => res ::: Type -> (choice :: Type -> tf choice -> res) -> res fun ex (tf :: (Type -> Type)) (choice :: Type) (body : tf choice) : ex tf = fn (res ::: Type) (f : choice :: Type -> tf choice -> res) => f [choice] body fun compose (t1 ::: Type) (t2 ::: Type) (t3 ::: Type) (f1 : t2 -> t3) (f2 : t1 -> t2) (x : t1) = f1 (f2 x) fun txt (t ::: Type) (ctx ::: {Unit}) (use ::: {Type}) (_ : show t) (v : t) = cdata (show v) fun foldUR (tf :: Type) (tr :: {Unit} -> Type) (f : nm :: Name -> rest :: {Unit} -> [[nm] ~ rest] => tf -> tr rest -> tr ([nm] ++ rest)) (i : tr []) (r :: {Unit}) (fold : folder r)= fold [fn r :: {Unit} => $(mapU tf r) -> tr r] (fn (nm :: Name) (t :: Unit) (rest :: {Unit}) acc [[nm] ~ rest] r => f [nm] [rest] ! r.nm (acc (r -- nm))) (fn _ => i) fun foldUR2 (tf1 :: Type) (tf2 :: Type) (tr :: {Unit} -> Type) (f : nm :: Name -> rest :: {Unit} -> [[nm] ~ rest] => tf1 -> tf2 -> tr rest -> tr ([nm] ++ rest)) (i : tr []) (r :: {Unit}) (fold : folder r) = fold [fn r :: {Unit} => $(mapU tf1 r) -> $(mapU tf2 r) -> tr r] (fn (nm :: Name) (t :: Unit) (rest :: {Unit}) acc [[nm] ~ rest] r1 r2 => f [nm] [rest] ! r1.nm r2.nm (acc (r1 -- nm) (r2 -- nm))) (fn _ _ => i) fun foldURX2 (tf1 :: Type) (tf2 :: Type) (ctx :: {Unit}) (f : nm :: Name -> rest :: {Unit} -> [[nm] ~ rest] => tf1 -> tf2 -> xml ctx [] []) = foldUR2 [tf1] [tf2] [fn _ => xml ctx [] []] (fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] v1 v2 acc => {f [nm] [rest] ! v1 v2}{acc}) fun foldR K (tf :: K -> Type) (tr :: {K} -> Type) (f : nm :: Name -> t :: K -> rest :: {K} -> [[nm] ~ rest] => tf t -> tr rest -> tr ([nm = t] ++ rest)) (i : tr []) (r :: {K}) (fold : folder r) = fold [fn r :: {K} => $(map tf r) -> tr r] (fn (nm :: Name) (t :: K) (rest :: {K}) (acc : _ -> tr rest) [[nm] ~ rest] r => f [nm] [t] [rest] ! r.nm (acc (r -- nm))) (fn _ => i) fun foldR2 K (tf1 :: K -> Type) (tf2 :: K -> Type) (tr :: {K} -> Type) (f : nm :: Name -> t :: K -> rest :: {K} -> [[nm] ~ rest] => tf1 t -> tf2 t -> tr rest -> tr ([nm = t] ++ rest)) (i : tr []) (r :: {K}) (fold : folder r) = fold [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> tr r] (fn (nm :: Name) (t :: K) (rest :: {K}) (acc : _ -> _ -> tr rest) [[nm] ~ rest] r1 r2 => f [nm] [t] [rest] ! r1.nm r2.nm (acc (r1 -- nm) (r2 -- nm))) (fn _ _ => i) fun foldRX K (tf :: K -> Type) (ctx :: {Unit}) (f : nm :: Name -> t :: K -> rest :: {K} -> [[nm] ~ rest] => tf t -> xml ctx [] []) = foldR [tf] [fn _ => xml ctx [] []] (fn (nm :: Name) (t :: K) (rest :: {K}) [[nm] ~ rest] r acc => {f [nm] [t] [rest] ! r}{acc}) fun foldRX2 K (tf1 :: K -> Type) (tf2 :: K -> Type) (ctx :: {Unit}) (f : nm :: Name -> t :: K -> rest :: {K} -> [[nm] ~ rest] => tf1 t -> tf2 t -> xml ctx [] []) = foldR2 [tf1] [tf2] [fn _ => xml ctx [] []] (fn (nm :: Name) (t :: K) (rest :: {K}) [[nm] ~ rest] r1 r2 acc => {f [nm] [t] [rest] ! r1 r2}{acc}) fun queryX (tables ::: {{Type}}) (exps ::: {Type}) (ctx ::: {Unit}) [tables ~ exps] (q : sql_query tables exps) (f : $(exps ++ map (fn fields :: {Type} => $fields) tables) -> xml ctx [] []) = query q (fn fs acc => return {acc}{f fs}) fun queryX' (tables ::: {{Type}}) (exps ::: {Type}) (ctx ::: {Unit}) [tables ~ exps] (q : sql_query tables exps) (f : $(exps ++ map (fn fields :: {Type} => $fields) tables) -> transaction (xml ctx [] [])) = query q (fn fs acc => r <- f fs; return {acc}{r}) fun oneOrNoRows (tables ::: {{Type}}) (exps ::: {Type}) [tables ~ exps] (q : sql_query tables exps) = query q (fn fs _ => return (Some fs)) None fun oneRow (tables ::: {{Type}}) (exps ::: {Type}) [tables ~ exps] (q : sql_query tables exps) = o <- oneOrNoRows q; return (case o of None => error Query returned no rows | Some r => r) fun eqNullable (tables ::: {{Type}}) (agg ::: {{Type}}) (exps ::: {Type}) (t ::: Type) (_ : sql_injectable (option t)) (e1 : sql_exp tables agg exps (option t)) (e2 : sql_exp tables agg exps (option t)) = (SQL ({e1} IS NULL AND {e2} IS NULL) OR {e1} = {e2}) fun eqNullable' (tables ::: {{Type}}) (agg ::: {{Type}}) (exps ::: {Type}) (t ::: Type) (_ : sql_injectable (option t)) (e1 : sql_exp tables agg exps (option t)) (e2 : option t) = case e2 of None => (SQL {e1} IS NULL) | Some _ => sql_binary sql_eq e1 (sql_inject e2)