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|
datatype dlist'' t =
Nil
| Cons of t * source (dlist'' t)
datatype dlist' t =
Empty
| Nonempty of { Head : dlist'' t, Tail : source (source (dlist'' t)) }
con dlist t = source (dlist' t)
type position = transaction unit
fun headPos [t] (dl : dlist t) =
dl' <- get dl;
case dl' of
Nonempty { Head = Cons (_, tl), Tail = tl' } =>
cur <- get tl;
set dl (case cur of
Nil => Empty
| _ => Nonempty {Head = cur, Tail = tl'})
| _ => return ()
fun tailPos [t] (cur : source (dlist'' t)) new tail =
new' <- get new;
set cur new';
case new' of
Nil => set tail cur
| _ => return ()
val create [t] = source Empty
fun clear [t] (s : dlist t) = set s Empty
fun append [t] dl v =
dl' <- get dl;
case dl' of
Empty =>
tl <- source Nil;
tl' <- source tl;
set dl (Nonempty {Head = Cons (v, tl), Tail = tl'});
return (headPos dl)
| Nonempty {Tail = tl, ...} =>
cur <- get tl;
new <- source Nil;
set cur (Cons (v, new));
set tl new;
return (tailPos cur new tl)
fun renderDyn [ctx] [ctx ~ body] [t] (f : t -> position -> xml (ctx ++ body) [] []) filter dl = <xml>
<dyn signal={dl' <- signal dl;
return (case dl' of
Empty => <xml/>
| Nonempty {Head = hd, Tail = tlTop} =>
let
fun render' prev dl'' =
case dl'' of
Nil => <xml/>
| Cons (v, tl) =>
let
val pos = case prev of
None => headPos dl
| Some prev => tailPos prev tl tlTop
in
<xml><dyn signal={b <- filter v;
return (if b then
f v pos
else
<xml/>)}/>
<dyn signal={tl' <- signal tl;
return (render' (Some tl) tl')}/></xml>
end
in
render' None hd
end)}/>
</xml>
fun renderFlat [ctx] [ctx ~ body] [t] (f : t -> position -> xml (ctx ++ body) [] []) filter ls =
List.mapX (fn p => f p.1 p.2) ls
fun render [ctx] [ctx ~ body] [t] f r dl = <xml>
<dyn signal={sort <- r.Sort;
case sort of
None => return (renderDyn f r.Filter dl)
| Some sort =>
dl' <- signal dl;
elems <- (case dl' of
Empty => return []
| Nonempty {Head = hd, Tail = tlTop} =>
let
fun listOut prev dl'' acc =
case dl'' of
Nil => return acc
| Cons (v, tl) =>
let
val pos = case prev of
None => headPos dl
| Some prev => tailPos prev tl tlTop
in
tl' <- signal tl;
listOut (Some tl) tl' ((v, pos) :: acc)
end
in
listOut None hd []
end);
return (renderFlat f r.Filter elems)}/>
</xml>
fun delete pos = pos
fun elements' [t] (dl'' : dlist'' t) =
case dl'' of
Nil => return []
| Cons (x, dl'') =>
dl'' <- signal dl'';
tl <- elements' dl'';
return (x :: tl)
fun elements [t] (dl : dlist t) =
dl' <- signal dl;
case dl' of
Empty => return []
| Nonempty {Head = hd, ...} => elements' hd
fun foldl [t] [acc] (f : t -> acc -> signal acc) =
let
fun foldl'' (i : acc) (dl : dlist'' t) : signal acc =
case dl of
Nil => return i
| Cons (v, dl') =>
dl' <- signal dl';
i' <- f v i;
foldl'' i' dl'
fun foldl' (i : acc) (dl : dlist t) : signal acc =
dl <- signal dl;
case dl of
Empty => return i
| Nonempty {Head = dl, ...} => foldl'' i dl
in
foldl'
end
|
