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Basic handling of recursive functions in Iflow
author Adam Chlipala <adamc@hcoop.net>
date Sat, 01 May 2010 09:51:46 -0400
parents ad15700272f6
children d008c4c43a0a
rev   line source
adamc@1002 1 con colMeta = fn (db :: Type, state :: Type) =>
adamc@650 2 {Nam : string,
adamc@1002 3 Show : db -> xbody,
adamc@1002 4 Inject : sql_injectable db,
adamc@650 5
adamc@1002 6 NewState : transaction state,
adamc@1002 7 Widget : state -> xbody,
adamc@1002 8 ReadState : state -> transaction db}
adamc@650 9 con colsMeta = fn cols :: {(Type * Type)} => $(map colMeta cols)
adamc@650 10
adamc@823 11 fun default [t] (sh : show t) (rd : read t) (inj : sql_injectable t)
adamc@650 12 name : colMeta (t, source string) =
adamc@650 13 {Nam = name,
adamc@650 14 Show = txt,
adamc@650 15 Inject = _,
adamc@650 16
adamc@650 17 NewState = source "",
adamc@650 18 Widget = fn s => <xml><ctextbox source={s}/></xml>,
adamc@650 19 ReadState = fn s => v <- get s; return (readError v)}
adamc@650 20
adamc@650 21 val int = default
adamc@650 22 val float = default
adamc@650 23 val string = default
adamc@650 24
adamc@650 25 functor Make(M : sig
adamc@650 26 con cols :: {(Type * Type)}
adamc@650 27 constraint [Id] ~ cols
adamc@650 28 val fl : folder cols
adamc@650 29
adamc@706 30 table tab : ([Id = int] ++ map fst cols)
adamc@650 31
adamc@650 32 val title : string
adamc@650 33
adamc@650 34 val cols : colsMeta cols
adamc@650 35 end) = struct
adamc@650 36
adamc@650 37 val t = M.tab
adamc@650 38
adamc@650 39 datatype list t = Nil | Cons of t * list t
adamc@650 40
adamc@650 41 fun allRows () =
adamc@650 42 query (SELECT * FROM t)
adamc@650 43 (fn r acc => return (Cons (r.T, acc)))
adamc@650 44 Nil
adamc@650 45
adamc@650 46 fun add r =
adamc@650 47 dml (insert t
adamc@1093 48 (@foldR2 [fst] [colMeta]
adamc@1093 49 [fn cols => $(map (fn t :: (Type * Type) =>
adamc@1093 50 sql_exp [] [] [] t.1) cols)]
adamc@1093 51 (fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
adamc@1093 52 [[nm] ~ rest] input col acc =>
adamc@1093 53 acc ++ {nm = @sql_inject col.Inject input})
adamc@1093 54 {} M.fl (r -- #Id) M.cols
adamc@1093 55 ++ {Id = (SQL {[r.Id]})}))
adamc@650 56
adamc@650 57 fun doBatch ls =
adamc@650 58 case ls of
adamc@650 59 Nil => return ()
adamc@650 60 | Cons (r, ls') =>
adamc@650 61 add r;
adamc@650 62 doBatch ls'
adamc@650 63
adamc@650 64 fun del id =
adamc@650 65 dml (DELETE FROM t WHERE t.Id = {[id]})
adamc@650 66
adamc@650 67 fun show withDel lss =
adamc@650 68 let
adamc@650 69 fun show' ls =
adamc@650 70 case ls of
adamc@650 71 Nil => <xml/>
adamc@650 72 | Cons (r, ls) => <xml>
adamc@650 73 <tr>
adamc@650 74 <td>{[r.Id]}</td>
adamc@1172 75 {@mapX2 [colMeta] [fst] [_]
adamc@1093 76 (fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}]
adamc@1093 77 [[nm] ~ rest] m v =>
adamc@1093 78 <xml><td>{m.Show v}</td></xml>)
adamc@1093 79 M.fl M.cols (r -- #Id)}
adamc@650 80 {if withDel then
adamc@908 81 <xml><td><button value="Delete" onclick={rpc (del r.Id)}/></td></xml>
adamc@650 82 else
adamc@650 83 <xml/>}
adamc@650 84 </tr>
adamc@650 85 {show' ls}
adamc@650 86 </xml>
adamc@650 87 in
adamc@650 88 <xml><dyn signal={ls <- signal lss; return <xml><table>
adamc@650 89 <tr>
adamc@650 90 <th>Id</th>
adamc@1172 91 {@mapX [colMeta] [_]
adamc@1093 92 (fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}]
adamc@1093 93 [[nm] ~ rest] m =>
adamc@1093 94 <xml><th>{[m.Nam]}</th></xml>)
adamc@1093 95 M.fl M.cols}
adamc@650 96 </tr>
adamc@650 97 {show' ls}
adamc@650 98 </table></xml>}/></xml>
adamc@650 99 end
adamc@650 100
adamc@650 101 fun main () =
adamc@650 102 lss <- source Nil;
adamc@650 103 batched <- source Nil;
adamc@650 104
adamc@650 105 id <- source "";
adamc@1093 106 inps <- @foldR [colMeta] [fn r => transaction ($(map snd r))]
adamc@1093 107 (fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest] m acc =>
adamc@1093 108 s <- m.NewState;
adamc@1093 109 r <- acc;
adamc@1093 110 return ({nm = s} ++ r))
adamc@1093 111 (return {})
adamc@1093 112 M.fl M.cols;
adamc@1093 113
adamc@650 114 let
adamc@650 115 fun add () =
adamc@650 116 id <- get id;
adamc@1093 117 vs <- @foldR2 [colMeta] [snd] [fn r => transaction ($(map fst r))]
adamc@1093 118 (fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}]
adamc@1093 119 [[nm] ~ rest] m s acc =>
adamc@1093 120 v <- m.ReadState s;
adamc@1093 121 r <- acc;
adamc@1093 122 return ({nm = v} ++ r))
adamc@1093 123 (return {})
adamc@1093 124 M.fl M.cols inps;
adamc@650 125 ls <- get batched;
adamc@650 126
adamc@650 127 set batched (Cons ({Id = readError id} ++ vs, ls))
adamc@650 128
adamc@650 129 fun exec () =
adamc@650 130 ls <- get batched;
adamc@650 131
adamc@908 132 rpc (doBatch ls);
adamc@650 133 set batched Nil
adamc@650 134 in
adamc@650 135 return <xml><body>
adamc@650 136 <h2>Rows</h2>
adamc@650 137
adamc@650 138 {show True lss}
adamc@650 139
adamc@908 140 <button value="Update" onclick={ls <- rpc (allRows ()); set lss ls}/><br/>
adamc@650 141 <br/>
adamc@650 142
adamc@650 143 <h2>Batch new rows to add</h2>
adamc@650 144
adamc@650 145 <table>
adamc@650 146 <tr> <th>Id:</th> <td><ctextbox source={id}/></td> </tr>
adamc@1172 147 {@mapX2 [colMeta] [snd] [_]
adamc@1093 148 (fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}]
adamc@1093 149 [[nm] ~ rest] m s =>
adamc@1093 150 <xml><tr> <th>{[m.Nam]}:</th> <td>{m.Widget s}</td> </tr></xml>)
adamc@1093 151 M.fl M.cols inps}
adamc@650 152 <tr> <th/> <td><button value="Batch it" onclick={add ()}/></td> </tr>
adamc@650 153 </table>
adamc@650 154
adamc@650 155 <h2>Already batched:</h2>
adamc@650 156 {show False batched}
adamc@650 157 <button value="Execute" onclick={exec ()}/>
adamc@650 158 </body></xml>
adamc@650 159 end
adamc@650 160
adamc@650 161 end