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-rw-r--r--demo/more/dbgrid.ur152
-rw-r--r--demo/more/dbgrid.urs19
-rw-r--r--demo/more/grid1.ur11
3 files changed, 139 insertions, 43 deletions
diff --git a/demo/more/dbgrid.ur b/demo/more/dbgrid.ur
index ad7c2789..15dfb857 100644
--- a/demo/more/dbgrid.ur
+++ b/demo/more/dbgrid.ur
@@ -15,53 +15,93 @@ con colMeta = fn (row :: {Type}) (global_t :: (Type * Type)) =>
Handlers : global_t.1 -> colMeta' row global_t.2}
structure Direct = struct
+ con metaBase = fn actual_input :: (Type * Type) =>
+ {Display : actual_input.2 -> xbody,
+ Edit : actual_input.2 -> xbody,
+ Initialize : actual_input.1 -> transaction actual_input.2,
+ Parse : actual_input.2 -> signal (option actual_input.1)}
+
+ datatype metaBoth actual input =
+ NonNull of metaBase (actual, input) * metaBase (option actual, input)
+ | Nullable of metaBase (actual, input)
+
con meta = fn global_actual_input :: (Type * Type * Type) =>
{Initialize : transaction global_actual_input.1,
Handlers : global_actual_input.1
- -> {Display : global_actual_input.3 -> xbody,
- Edit : global_actual_input.3 -> xbody,
- Initialize : global_actual_input.2 -> transaction global_actual_input.3,
- Parse : global_actual_input.3 -> signal (option global_actual_input.2)}}
+ -> metaBoth global_actual_input.2 global_actual_input.3}
con editableState (ts :: (Type * Type * Type)) = (ts.1, ts.3)
fun editable [ts] [rest] [nm :: Name] [[nm] ~ rest] name (m : meta ts) : colMeta ([nm = ts.2] ++ rest)
(editableState ts) =
- {Initialize = m.Initialize,
- Handlers = fn data => {Header = name,
- Project = fn r => (m.Handlers data).Initialize r.nm,
- Update = fn r s =>
- vo <- current ((m.Handlers data).Parse s);
- return (case vo of
- None => r
- | Some v => r -- nm ++ {nm = v}),
- Display = (m.Handlers data).Display,
- Edit = (m.Handlers data).Edit,
- Validate = fn s => vo <- (m.Handlers data).Parse s; return (Option.isSome vo)}}
+ let
+ fun doMr mr = {Header = name,
+ Project = fn r => mr.Initialize r.nm,
+ Update = fn r s =>
+ vo <- current (mr.Parse s);
+ return (case vo of
+ None => r
+ | Some v => r -- nm ++ {nm = v}),
+ Display = mr.Display,
+ Edit = mr.Edit,
+ Validate = fn s => vo <- mr.Parse s; return (Option.isSome vo)}
+ in
+ {Initialize = m.Initialize,
+ Handlers = fn data => case m.Handlers data of
+ NonNull (mr, _) => doMr mr
+ | Nullable mr => doMr mr}
+ end
con readOnlyState (ts :: (Type * Type * Type)) = (ts.1, ts.3)
fun readOnly [ts] [rest] [nm :: Name] [[nm] ~ rest] name (m : meta ts) : colMeta ([nm = ts.2] ++ rest)
(readOnlyState ts) =
- {Initialize = m.Initialize,
- Handlers = fn data => {Header = name,
- Project = fn r => (m.Handlers data).Initialize r.nm,
- Update = fn r _ => return r,
- Display = (m.Handlers data).Display,
- Edit = (m.Handlers data).Display,
- Validate = fn _ => return True}}
+ let
+ fun doMr mr = {Header = name,
+ Project = fn r => mr.Initialize r.nm,
+ Update = fn r _ => return r,
+ Display = mr.Display,
+ Edit = mr.Display,
+ Validate = fn _ => return True}
+ in
+ {Initialize = m.Initialize,
+ Handlers = fn data => case m.Handlers data of
+ NonNull (mr, _) => doMr mr
+ | Nullable mr => doMr mr}
+ end
con metaBasic = fn actual_input :: (Type * Type) =>
- {Display : actual_input.2 -> xbody,
- Edit : source actual_input.2 -> xbody,
- Initialize : actual_input.1 -> actual_input.2,
- Parse : actual_input.2 -> option actual_input.1}
+ {Display : actual_input.2 -> xbody,
+ Edit : source actual_input.2 -> xbody,
+ Initialize : actual_input.1 -> actual_input.2,
+ InitializeNull : actual_input.2,
+ IsNull : actual_input.2 -> bool,
+ Parse : actual_input.2 -> option actual_input.1}
con basicState = source
fun basic [ts ::: (Type * Type)] (m : metaBasic ts) : meta (unit, ts.1, basicState ts.2) =
{Initialize = return (),
- Handlers = fn () => {Display = fn s => <xml><dyn signal={v <- signal s; return (m.Display v)}/></xml>,
+ Handlers = fn () => NonNull (
+ {Display = fn s => <xml><dyn signal={v <- signal s; return (m.Display v)}/></xml>,
Edit = m.Edit,
Initialize = fn v => source (m.Initialize v),
- Parse = fn s => v <- signal s; return (m.Parse v)}}
+ Parse = fn s => v <- signal s; return (m.Parse v)},
+ {Display = fn s => <xml><dyn signal={v <- signal s; return (m.Display v)}/></xml>,
+ Edit = m.Edit,
+ Initialize = fn v => source (case v of
+ None => m.InitializeNull
+ | Some v => m.Initialize v),
+ Parse = fn s => v <- signal s;
+ return (if m.IsNull v then
+ Some None
+ else
+ case m.Parse v of
+ None => None
+ | Some v' => Some (Some v'))})}
+
+ fun nullable [global] [actual] [input] (m : meta (global, actual, input)) =
+ {Initialize = m.Initialize,
+ Handlers = fn d => case m.Handlers d of
+ Nullable _ => error <xml>Don't stack calls to Direct.nullable!</xml>
+ | NonNull (_, ho) => Nullable ho}
type intGlobal = unit
type intInput = basicState string
@@ -69,6 +109,8 @@ structure Direct = struct
basic {Display = fn s => <xml>{[s]}</xml>,
Edit = fn s => <xml><ctextbox source={s}/></xml>,
Initialize = fn n => show n,
+ InitializeNull = "",
+ IsNull = eq "",
Parse = fn v => read v}
type stringGlobal = unit
@@ -77,6 +119,8 @@ structure Direct = struct
basic {Display = fn s => <xml>{[s]}</xml>,
Edit = fn s => <xml><ctextbox source={s}/></xml>,
Initialize = fn s => s,
+ InitializeNull = "",
+ IsNull = eq "",
Parse = fn s => Some s}
type boolGlobal = unit
@@ -85,6 +129,8 @@ structure Direct = struct
basic {Display = fn b => <xml>{[b]}</xml>,
Edit = fn s => <xml><ccheckbox source={s}/></xml>,
Initialize = fn b => b,
+ InitializeNull = False,
+ IsNull = fn _ => False,
Parse = fn b => Some b}
functor Foreign (M : sig
@@ -102,7 +148,7 @@ structure Direct = struct
open M
con global = list (t * string)
- con input = source string * t * $row
+ con input = source string * option (t * $row)
val getChoices = List.mapQuery (SELECT * FROM tab AS T)
(fn r => (r.T.nm, render r.T))
@@ -111,21 +157,57 @@ structure Direct = struct
r <- oneRow (SELECT T.{{row}} FROM tab AS T WHERE T.{nm} = {[k]});
return r.T
- val meta =
+ val meta : meta (global, M.t, input) =
{Initialize = getChoices,
Handlers = fn choices =>
- {Display = fn (_, k, r) => <xml>{[render ({nm = k} ++ r)]}</xml>,
- Edit = fn (s, k, _) =>
+ NonNull (
+ {Display = fn (_, kr) => case kr of
+ None => error <xml>Unexpected Foreign null</xml>
+ | Some (k, r) => <xml>{[render ({nm = k} ++ r)]}</xml>,
+ Edit = fn (s, kr) =>
<xml><cselect source={s}>
{List.mapX (fn (k', rend) =>
- <xml><coption value={show k'} selected={k' = k}>{[rend]}</coption>
+ <xml><coption value={show k'} selected={case kr of
+ None => False
+ | Some (k, _) =>
+ k' = k}>{[rend]}</coption>
</xml>)
choices}
</cselect></xml>,
Initialize = fn k => s <- source (show k);
r <- rpc (getChoice k);
- return (s, k, r),
- Parse = fn (s, _, _) => k <- signal s; return (read k)}}
+ return (s, Some (k, r)),
+ Parse = fn (s, _) => k <- signal s; return (read k : option t)},
+ {Display = fn (_, kr) => case kr of
+ None => <xml>NULL</xml>
+ | Some (k, r) => <xml>{[render ({nm = k} ++ r)]}</xml>,
+ Edit = fn (s, kr) =>
+ <xml><cselect source={s}>
+ <coption value="" selected={case kr of
+ None => True
+ | _ => False}>NULL</coption>
+ {List.mapX (fn (k', rend) =>
+ <xml><coption value={show k'} selected={case kr of
+ None => False
+ | Some (k, _) =>
+ k' = k}>{[rend]}</coption>
+ </xml>)
+ choices}
+ </cselect></xml>,
+ Initialize = fn k => case k of
+ None =>
+ s <- source "";
+ return (s, None)
+ | Some k =>
+ s <- source (show k);
+ r <- rpc (getChoice k);
+ return (s, Some (k, r)),
+ Parse = fn (s, _) => ks <- signal s;
+ return (case ks of
+ "" => Some None
+ | _ => case read ks : option t of
+ None => None
+ | Some k => Some (Some k))})}
end
end
diff --git a/demo/more/dbgrid.urs b/demo/more/dbgrid.urs
index 5f51fcd4..cfbdff89 100644
--- a/demo/more/dbgrid.urs
+++ b/demo/more/dbgrid.urs
@@ -15,13 +15,20 @@ con colMeta = fn (row :: {Type}) (global_t :: (Type * Type)) =>
Handlers : global_t.1 -> colMeta' row global_t.2}
structure Direct : sig
+ con metaBase = fn actual_input :: (Type * Type) =>
+ {Display : actual_input.2 -> xbody,
+ Edit : actual_input.2 -> xbody,
+ Initialize : actual_input.1 -> transaction actual_input.2,
+ Parse : actual_input.2 -> signal (option actual_input.1)}
+
+ datatype metaBoth actual input =
+ NonNull of metaBase (actual, input) * metaBase (option actual, input)
+ | Nullable of metaBase (actual, input)
+
con meta = fn global_actual_input :: (Type * Type * Type) =>
{Initialize : transaction global_actual_input.1,
Handlers : global_actual_input.1
- -> {Display : global_actual_input.3 -> xbody,
- Edit : global_actual_input.3 -> xbody,
- Initialize : global_actual_input.2 -> transaction global_actual_input.3,
- Parse : global_actual_input.3 -> signal (option global_actual_input.2)}}
+ -> metaBoth global_actual_input.2 global_actual_input.3}
con editableState :: (Type * Type * Type) -> (Type * Type)
val editable : ts ::: (Type * Type * Type) -> rest ::: {Type}
@@ -35,6 +42,10 @@ structure Direct : sig
-> colMeta ([nm = ts.2] ++ rest)
(readOnlyState ts)
+ val nullable : global ::: Type -> actual ::: Type -> input ::: Type
+ -> meta (global, actual, input)
+ -> meta (global, option actual, input)
+
type intGlobal
type intInput
val int : meta (intGlobal, int, intInput)
diff --git a/demo/more/grid1.ur b/demo/more/grid1.ur
index a62d7819..4d0fe1bf 100644
--- a/demo/more/grid1.ur
+++ b/demo/more/grid1.ur
@@ -4,11 +4,11 @@ table t1 : {Id : int, A : string}
PRIMARY KEY Id
sequence s
-table t : {Id : int, A : int, B : string, C : bool, D : int}
+table t : {Id : int, A : int, B : string, C : bool, D : int, E : option int}
PRIMARY KEY Id,
CONSTRAINT Foreign FOREIGN KEY (D) REFERENCES t1(Id) ON DELETE CASCADE
-fun page (n, s) = return <xml>A = {[n]}, B = {[s]}</xml>
+(*fun page (n, s) = return <xml>A = {[n]}, B = {[s]}</xml>*)
open Make(struct
val tab = t
@@ -23,6 +23,8 @@ open Make(struct
C = {New = return False,
Inj = _},
D = {New = return 0,
+ Inj = _},
+ E = {New = return None,
Inj = _}}
structure F = Direct.Foreign(struct
@@ -34,10 +36,11 @@ open Make(struct
val cols = {Id = Direct.readOnly [#Id] ! "Id" Direct.int,
A = Direct.editable [#A] ! "A" Direct.int,
B = Direct.editable [#B] ! "B" Direct.string,
- C = Direct.editable [#C] ! "C" Direct.bool,
+ C = Direct.editable [#C] ! "C" Direct.bool(*,
D = Direct.editable [#D] ! "D" F.meta,
+ E = Direct.editable [#E] ! "E" (Direct.nullable Direct.int),
DA = computed "2A" (fn r => 2 * r.A),
- Link = computedHtml "Link" (fn r => <xml><a link={page (r.A, r.B)}>Go</a></xml>)}
+ Link = computedHtml "Link" (fn r => <xml><a link={page (r.A, r.B)}>Go</a></xml>)*)}
end)
fun main () =
generated by cgit v1.2.3 (git 2.39.1) at 2024-10-30 20:10:04 +0000