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(** Row folding *)
con folder = K ==> fn r :: {K} =>
tf :: ({K} -> Type)
-> (nm :: Name -> v :: K -> r :: {K} -> tf r
-> fn [[nm] ~ r] => tf ([nm = v] ++ r))
-> tf [] -> tf r
structure Folder = struct
fun nil K (tf :: {K} -> Type)
(f : nm :: Name -> v :: K -> r :: {K} -> tf r
-> fn [[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
-> fn [[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
-> fn [[nm] ~ r] => tf ([nm = v] ++ r))
(i : tf []) =
f1 [fn r1' [r1' ~ r2] => tf (r1' ++ r2)] 0
(*(fn (nm :: Name) (v :: K) (r1' :: {K}) (acc : fn [r1' ~ r2] => tf (r1' ++ r2))
[[nm] ~ r1'] [[nm = v] ++ r1' ~ r2] =>
f [nm] [v] [r1' ++ r2] acc)
(f2 [tf] f i)*)
end
fun not b = if b then False else True
con idT (t :: Type) = t
con record (t :: {Type}) = $t
con fstTT (t :: (Type * Type)) = t.1
con sndTT (t :: (Type * Type)) = t.2
con fstTTT (t :: (Type * Type * Type)) = t.1
con sndTTT (t :: (Type * Type * Type)) = t.2
con thdTTT (t :: (Type * Type * Type)) = t.3
con mapUT = fn f :: Type => 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}
-> fn [[nm] ~ rest] =>
tf -> tr rest -> tr ([nm] ++ rest))
(i : tr []) (r ::: {Unit}) (fold : folder r)=
fold [fn r :: {Unit} => $(mapUT 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}
-> fn [[nm] ~ rest] =>
tf1 -> tf2 -> tr rest -> tr ([nm] ++ rest))
(i : tr []) (r ::: {Unit}) (fold : folder r) =
fold [fn r :: {Unit} => $(mapUT tf1 r) -> $(mapUT 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}
-> fn [[nm] ~ rest] =>
tf1 -> tf2 -> xml ctx [] []) =
foldUR2 [tf1] [tf2] [fn _ => xml ctx [] []]
(fn (nm :: Name) (rest :: {Unit}) [[nm] ~ rest] v1 v2 acc =>
<xml>{f [nm] [rest] v1 v2}{acc}</xml>)
<xml/>
fun foldR K (tf :: K -> Type) (tr :: {K} -> Type)
(f : nm :: Name -> t :: K -> rest :: {K}
-> fn [[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}
-> fn [[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}
-> fn [[nm] ~ rest] =>
tf t -> xml ctx [] []) =
foldR [tf] [fn _ => xml ctx [] []]
(fn (nm :: Name) (t :: K) (rest :: {K}) [[nm] ~ rest] r acc =>
<xml>{f [nm] [t] [rest] r}{acc}</xml>)
<xml/>
fun foldRX2 K (tf1 :: K -> Type) (tf2 :: K -> Type) (ctx :: {Unit})
(f : nm :: Name -> t :: K -> rest :: {K}
-> fn [[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 =>
<xml>{f [nm] [t] [rest] r1 r2}{acc}</xml>)
<xml/>
fun queryX (tables ::: {{Type}}) (exps ::: {Type}) (ctx ::: {Unit})
(q : sql_query tables exps) [tables ~ exps]
(f : $(exps ++ map (fn fields :: {Type} => $fields) tables)
-> xml ctx [] []) =
query q
(fn fs acc => return <xml>{acc}{f fs}</xml>)
<xml/>
fun queryX' (tables ::: {{Type}}) (exps ::: {Type}) (ctx ::: {Unit})
(q : sql_query tables exps) [tables ~ exps]
(f : $(exps ++ map (fn fields :: {Type} => $fields) tables)
-> transaction (xml ctx [] [])) =
query q
(fn fs acc =>
r <- f fs;
return <xml>{acc}{r}</xml>)
<xml/>
fun oneOrNoRows (tables ::: {{Type}}) (exps ::: {Type})
(q : sql_query tables exps) [tables ~ exps] =
query q
(fn fs _ => return (Some fs))
None
fun oneRow (tables ::: {{Type}}) (exps ::: {Type})
(q : sql_query tables exps) [tables ~ exps] =
o <- oneOrNoRows q;
return (case o of
None => error <xml>Query returned no rows</xml>
| 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)
|
