adamc@623: (** Row folding *)
adamc@623: 
adamc@623: con folder = K ==> fn r :: {K} =>
adamc@623:                       tf :: ({K} -> Type)
adamc@653:                       -> (nm :: Name -> v :: K -> r :: {K} -> [[nm] ~ r] =>
adamc@653:                           tf r -> tf ([nm = v] ++ r))
adamc@623:                       -> tf [] -> tf r
adamc@623: 
adamc@822: fun fold [K] [tf :: {K} -> Type]
adamc@653:          (f : (nm :: Name -> v :: K -> r :: {K} -> [[nm] ~ r] =>
adamc@653:                tf r -> tf ([nm = v] ++ r)))
adamc@822:          (i : tf []) [r :: {K}] (fl : folder r) = fl [tf] f i
adamc@653: 
adamc@627: structure Folder = struct
adamc@822:     fun nil [K] [tf :: {K} -> Type]
adamc@653:             (f : nm :: Name -> v :: K -> r :: {K} -> [[nm] ~ r] =>
adamc@653:              tf r -> tf ([nm = v] ++ r))
adamc@627:             (i : tf []) = i
adamc@627: 
adamc@822:     fun cons [K] [r ::: {K}] [nm :: Name] [v :: K] [[nm] ~ r] (fold : folder r)
adamc@822:              [tf :: {K} -> Type]
adamc@653:              (f : nm :: Name -> v :: K -> r :: {K} -> [[nm] ~ r] =>
adamc@653:               tf r -> tf ([nm = v] ++ r))
adamc@653:              (i : tf []) = f [nm] [v] [r] ! (fold [tf] f i)
adamc@628: 
adamc@822:     fun concat [K] [r1 ::: {K}] [r2 ::: {K}] [r1 ~ r2]
adamc@628:         (f1 : folder r1) (f2 : folder r2)
adamc@822:         [tf :: {K} -> Type]
adamc@653:         (f : nm :: Name -> v :: K -> r :: {K} -> [[nm] ~ r] =>
adamc@653:          tf r -> tf ([nm = v] ++ r))
adamc@628:         (i : tf []) =
adamc@629:         f1 [fn r1' => [r1' ~ r2] => tf (r1' ++ r2)]
adamc@822:            (fn [nm :: Name] [v :: K] [r1' :: {K}] [[nm] ~ r1']
adamc@653:                             (acc : [r1' ~ r2] => tf (r1' ++ r2))
adamc@653:                             [[nm = v] ++ r1' ~ r2] =>
adamc@653:                f [nm] [v] [r1' ++ r2] ! acc)
adamc@629:            (fn [[] ~ r2] => f2 [tf] f i) !
adamc@630: 
adamc@822:     fun mp [K1] [K2] [f ::: K1 -> K2] [r ::: {K1}]
adamc@630:         (fold : folder r)
adamc@822:         [tf :: {K2} -> Type]
adamc@653:         (f : nm :: Name -> v :: K2 -> r :: {K2} -> [[nm] ~ r] =>
adamc@653:          tf r -> tf ([nm = v] ++ r))
adamc@630:         (i : tf []) =
adamc@630:         fold [fn r => tf (map f r)]
adamc@822:         (fn [nm :: Name] [v :: K1] [rest :: {K1}] [[nm] ~ rest] (acc : tf (map f rest)) =>
adamc@653:             f [nm] [f v] [map f rest] ! acc)
adamc@630:         i
adamc@627: end
adamc@627: 
adamc@623: 
adamc@422: fun not b = if b then False else True
adamc@422: 
adamc@898: con id = K ==> fn t :: K => t
adamc@356: con record (t :: {Type}) = $t
adamc@637: con fst = K1 ==> K2 ==> fn t :: (K1 * K2) => t.1
adamc@637: con snd = K1 ==> K2 ==> fn t :: (K1 * K2) => t.2
adamc@637: con fst3 = K1 ==> K2 ==> K3 ==> fn t :: (K1 * K2 * K3) => t.1
adamc@637: con snd3 = K1 ==> K2 ==> K3 ==> fn t :: (K1 * K2 * K3) => t.2
adamc@637: con thd3 = K1 ==> K2 ==> K3 ==> fn t :: (K1 * K2 * K3) => t.3
adamc@329: 
adamc@643: con mapU = K ==> fn f :: K => map (fn _ :: Unit => f)
adamc@445: 
adamc@339: con ex = fn tf :: (Type -> Type) =>
adamc@356:             res ::: Type -> (choice :: Type -> tf choice -> res) -> res
adamc@339: 
adamc@822: fun ex [tf :: (Type -> Type)] [choice :: Type] (body : tf choice) : ex tf =
adamc@822:  fn [res] (f : choice :: Type -> tf choice -> res) =>
adamc@356:     f [choice] body
adamc@339: 
adamc@822: fun compose [t1 ::: Type] [t2 ::: Type] [t3 ::: Type]
adamc@356:             (f1 : t2 -> t3) (f2 : t1 -> t2) (x : t1) = f1 (f2 x)
adamc@325: 
adamc@822: fun show_option [t ::: Type] (_ : show t) =
adamc@777:     mkShow (fn opt : option t =>
adamc@777:                case opt of
adamc@777:                    None => ""
adamc@777:                  | Some x => show x)
adamc@777: 
adamc@822: fun read_option [t ::: Type] (_ : read t) =
adamc@777:     mkRead (fn s =>
adamc@777:                case s of
adamc@777:                    "" => None
adamc@777:                  | _ => Some (readError s : t))
adamc@777:            (fn s =>
adamc@777:                case s of
adamc@777:                    "" => Some None
adamc@777:                  | _ => case read s of
adamc@777:                             None => None
adamc@777:                           | v => Some v)
adamc@777: 
adamc@822: fun txt [t] [ctx ::: {Unit}] [use ::: {Type}] (_ : show t) (v : t) =
adamc@564:     cdata (show v)
adamc@328: 
adamc@898: fun mp [K] [tf1 :: K -> Type] [tf2 :: K -> Type] (f : t ::: K -> tf1 t -> tf2 t) [r :: {K}] (fl : folder r) =
adamc@898:     fl [fn r :: {K} => $(map tf1 r) -> $(map tf2 r)]
adamc@898:     (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] acc r =>
adamc@898:         acc (r -- nm) ++ {nm = f r.nm})
adamc@898:     (fn _ => {})
adamc@898: 
adamc@898: fun map2 [K1] [K2] [tf1 :: K1 -> Type] [tf2 :: K2 -> Type] [tf :: K1 -> K2]
adamc@898:          (f : t ::: K1 -> tf1 t -> tf2 (tf t)) [r :: {K1}] (fl : folder r) =
adamc@898:     fl [fn r :: {K1} => $(map tf1 r) -> $(map tf2 (map tf r))]
adamc@898:     (fn [nm :: Name] [t :: K1] [rest :: {K1}] [[nm] ~ rest] acc r =>
adamc@898:         acc (r -- nm) ++ {nm = f r.nm})
adamc@898:     (fn _ => {})
adamc@898: 
adamc@822: fun foldUR [tf :: Type] [tr :: {Unit} -> Type]
adamc@411:            (f : nm :: Name -> rest :: {Unit}
adamc@629:                 -> [[nm] ~ rest] =>
adamc@411:                       tf -> tr rest -> tr ([nm] ++ rest))
adamc@898:            (i : tr []) [r :: {Unit}] (fl : folder r) =
adamc@653:     fl [fn r :: {Unit} => $(mapU tf r) -> tr r]
adamc@822:        (fn [nm :: Name] [t :: Unit] [rest :: {Unit}] [[nm] ~ rest] acc r =>
adamc@653:            f [nm] [rest] ! r.nm (acc (r -- nm)))
adamc@653:        (fn _ => i)
adamc@411: 
adamc@822: fun foldUR2 [tf1 :: Type] [tf2 :: Type] [tr :: {Unit} -> Type]
adamc@418:            (f : nm :: Name -> rest :: {Unit}
adamc@629:                 -> [[nm] ~ rest] =>
adamc@418:                       tf1 -> tf2 -> tr rest -> tr ([nm] ++ rest))
adamc@822:            (i : tr []) [r :: {Unit}] (fl : folder r) =
adamc@653:     fl [fn r :: {Unit} => $(mapU tf1 r) -> $(mapU tf2 r) -> tr r]
adamc@822:        (fn [nm :: Name] [t :: Unit] [rest :: {Unit}] [[nm] ~ rest] acc r1 r2 =>
adamc@653:            f [nm] [rest] ! r1.nm r2.nm (acc (r1 -- nm) (r2 -- nm)))
adamc@653:        (fn _ _ => i)
adamc@418: 
adamc@822: fun foldURX2 [tf1 :: Type] [tf2 :: Type] [ctx :: {Unit}]
adamc@418:            (f : nm :: Name -> rest :: {Unit}
adamc@629:                 -> [[nm] ~ rest] =>
adamc@720:                       tf1 -> tf2 -> xml ctx [] []) =
adamc@720:     foldUR2 [tf1] [tf2] [fn _ => xml ctx [] []]
adamc@822:             (fn [nm :: Name] [rest :: {Unit}] [[nm] ~ rest] v1 v2 acc =>
adamc@629:                 <xml>{f [nm] [rest] ! v1 v2}{acc}</xml>)
adamc@418:             <xml/>
adamc@418: 
adamc@822: fun foldR [K] [tf :: K -> Type] [tr :: {K} -> Type]
adamc@623:            (f : nm :: Name -> t :: K -> rest :: {K}
adamc@629:                 -> [[nm] ~ rest] =>
adamc@356:                       tf t -> tr rest -> tr ([nm = t] ++ rest))
adamc@822:            (i : tr []) [r :: {K}] (fl : folder r) =
adamc@653:     fl [fn r :: {K} => $(map tf r) -> tr r]
adamc@822:        (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] (acc : _ -> tr rest) r =>
adamc@653:            f [nm] [t] [rest] ! r.nm (acc (r -- nm)))
adamc@653:        (fn _ => i)
adamc@336: 
adamc@822: fun foldR2 [K] [tf1 :: K -> Type] [tf2 :: K -> Type] [tr :: {K} -> Type]
adamc@623:             (f : nm :: Name -> t :: K -> rest :: {K}
adamc@629:                  -> [[nm] ~ rest] =>
adamc@367:                        tf1 t -> tf2 t -> tr rest -> tr ([nm = t] ++ rest))
adamc@822:             (i : tr []) [r :: {K}] (fl : folder r) =
adamc@653:     fl [fn r :: {K} => $(map tf1 r) -> $(map tf2 r) -> tr r]
adamc@822:        (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] 
adamc@653:                         (acc : _ -> _ -> tr rest) r1 r2 =>
adamc@653:            f [nm] [t] [rest] ! r1.nm r2.nm (acc (r1 -- nm) (r2 -- nm)))
adamc@653:        (fn _ _ => i)
adamc@332: 
adamc@822: fun foldRX [K] [tf :: K -> Type] [ctx :: {Unit}]
adamc@623:             (f : nm :: Name -> t :: K -> rest :: {K}
adamc@629:                  -> [[nm] ~ rest] =>
adamc@720:                        tf t -> xml ctx [] []) =
adamc@720:     foldR [tf] [fn _ => xml ctx [] []]
adamc@822:           (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest] r acc =>
adamc@629:               <xml>{f [nm] [t] [rest] ! r}{acc}</xml>)
adamc@623:           <xml/>
adamc@336: 
adamc@822: fun foldRX2 [K] [tf1 :: K -> Type] [tf2 :: K -> Type] [ctx :: {Unit}]
adamc@623:              (f : nm :: Name -> t :: K -> rest :: {K}
adamc@629:                   -> [[nm] ~ rest] =>
adamc@720:                         tf1 t -> tf2 t -> xml ctx [] []) =
adamc@720:     foldR2 [tf1] [tf2] [fn _ => xml ctx [] []]
adamc@822:            (fn [nm :: Name] [t :: K] [rest :: {K}] [[nm] ~ rest]
adamc@623:                             r1 r2 acc =>
adamc@629:                <xml>{f [nm] [t] [rest] ! r1 r2}{acc}</xml>)
adamc@623:            <xml/>
adamc@445: 
adamc@822: fun queryI [tables ::: {{Type}}] [exps ::: {Type}]
adamc@682:            [tables ~ exps] (q : sql_query tables exps)
adamc@682:            (f : $(exps ++ map (fn fields :: {Type} => $fields) tables)
adamc@682:                 -> transaction unit) =
adamc@682:     query q
adamc@682:           (fn fs _ => f fs)
adamc@682:           ()
adamc@682: 
adamc@822: fun queryX [tables ::: {{Type}}] [exps ::: {Type}] [ctx ::: {Unit}]
adamc@632:            [tables ~ exps] (q : sql_query tables exps)
adamc@621:            (f : $(exps ++ map (fn fields :: {Type} => $fields) tables)
adamc@720:                 -> xml ctx [] []) =
adamc@356:     query q
adamc@356:           (fn fs acc => return <xml>{acc}{f fs}</xml>)
adamc@360:           <xml/>
adamc@341: 
adamc@822: fun queryX' [tables ::: {{Type}}] [exps ::: {Type}] [ctx ::: {Unit}]
adamc@632:             [tables ~ exps] (q : sql_query tables exps)
adamc@621:             (f : $(exps ++ map (fn fields :: {Type} => $fields) tables)
adamc@720:                  -> transaction (xml ctx [] [])) =
adamc@469:     query q
adamc@469:           (fn fs acc =>
adamc@469:               r <- f fs;
adamc@469:               return <xml>{acc}{r}</xml>)
adamc@469:           <xml/>
adamc@469: 
adamc@822: fun oneOrNoRows [tables ::: {{Type}}] [exps ::: {Type}]
adamc@629:                 [tables ~ exps]
adamc@629:                 (q : sql_query tables exps)  =
adamc@356:     query q
adamc@356:           (fn fs _ => return (Some fs))
adamc@356:           None
adamc@440: 
adamc@822: fun oneRow [tables ::: {{Type}}] [exps ::: {Type}]
adamc@822:            [tables ~ exps] (q : sql_query tables exps) =
adamc@440:     o <- oneOrNoRows q;
adamc@440:     return (case o of
adamc@440:                 None => error <xml>Query returned no rows</xml>
adamc@440:               | Some r => r)
adamc@440: 
adamc@822: fun eqNullable [tables ::: {{Type}}] [agg ::: {{Type}}] [exps ::: {Type}]
adamc@822:     [t ::: Type] (_ : sql_injectable (option t))
adamc@470:     (e1 : sql_exp tables agg exps (option t))
adamc@470:     (e2 : sql_exp tables agg exps (option t)) =
adamc@471:     (SQL ({e1} IS NULL AND {e2} IS NULL) OR {e1} = {e2})
adamc@470: 
adamc@822: fun eqNullable' [tables ::: {{Type}}] [agg ::: {{Type}}] [exps ::: {Type}]
adamc@822:     [t ::: Type] (_ : sql_injectable (option t))
adamc@470:     (e1 : sql_exp tables agg exps (option t))
adamc@470:     (e2 : option t) =
adamc@470:     case e2 of
adamc@471:         None => (SQL {e1} IS NULL)
adamc@564:       | Some _ => sql_binary sql_eq e1 (sql_inject e2)