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Tutorial: hyperlinks for metaprogramming and row types
author Adam Chlipala <adam@chlipala.net>
date Wed, 20 Jul 2011 08:14:49 -0400
parents 1fb318c17546
children
rev   line source
adamc@339 1 con colMeta = fn t_formT :: (Type * Type) => {
adamc@369 2 Nam : string,
adamc@369 3 Show : t_formT.1 -> xbody,
adamc@369 4 Widget : nm :: Name -> xml form [] [nm = t_formT.2],
adamc@369 5 WidgetPopulated : nm :: Name -> t_formT.1 -> xml form [] [nm = t_formT.2],
adamc@369 6 Parse : t_formT.2 -> t_formT.1,
adamc@369 7 Inject : sql_injectable t_formT.1
adamc@369 8 }
adamc@339 9 con colsMeta = fn cols :: {(Type * Type)} => $(Top.mapT2T colMeta cols)
adamc@326 10
adamc@362 11 fun default (t ::: Type) (sh : show t) (rd : read t) (inj : sql_injectable t)
adamc@362 12 name : colMeta (t, string) =
adamc@362 13 {Nam = name,
adamc@403 14 Show = txt,
adamc@371 15 Widget = fn nm :: Name => <xml><textbox{nm}/></xml>,
adamc@362 16 WidgetPopulated = fn (nm :: Name) n =>
adamc@403 17 <xml><textbox{nm} value={show n}/></xml>,
adamc@403 18 Parse = readError,
adamc@362 19 Inject = _}
adamc@362 20
adamc@403 21 val int = default
adamc@403 22 val float = default
adamc@403 23 val string = default
adamc@362 24
adamc@362 25 fun bool name = {Nam = name,
adamc@403 26 Show = txt,
adamc@371 27 Widget = fn nm :: Name => <xml><checkbox{nm}/></xml>,
adamc@362 28 WidgetPopulated = fn (nm :: Name) b =>
adamc@371 29 <xml><checkbox{nm} checked={b}/></xml>,
adamc@362 30 Parse = fn x => x,
adamc@362 31 Inject = _}
adamc@362 32
adamc@325 33 functor Make(M : sig
adamc@370 34 con cols :: {(Type * Type)}
adamc@370 35 constraint [Id] ~ cols
adamc@706 36 table tab : ([Id = int] ++ mapT2T fstTT cols)
adamc@325 37
adamc@370 38 val title : string
adamc@325 39
adamc@370 40 val cols : colsMeta cols
adamc@369 41 end) = struct
adamc@325 42
adamc@370 43 open constraints M
adamc@370 44 val tab = M.tab
adamc@325 45
adamc@370 46 sequence seq
adamc@339 47
adamc@370 48 fun create (inputs : $(mapT2T sndTT M.cols)) =
adamc@370 49 id <- nextval seq;
adamc@370 50 () <- dml (insert tab
adamc@370 51 (foldT2R2 [sndTT] [colMeta]
adamc@370 52 [fn cols => $(mapT2T (fn t :: (Type * Type) =>
adamc@370 53 sql_exp [] [] [] t.1) cols)]
adamc@370 54 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@370 55 [[nm] ~ rest] =>
adamc@403 56 fn input col acc => acc with nm = @sql_inject col.Inject (col.Parse input))
adamc@370 57 {} [M.cols] inputs M.cols
adamc@370 58 with #Id = (SQL {id})));
adamc@370 59 return <xml><body>
adamc@403 60 Inserted with ID {[id]}.
adamc@370 61 </body></xml>
adamc@370 62
adamc@370 63 fun save (id : int) (inputs : $(mapT2T sndTT M.cols)) =
adamc@370 64 () <- dml (update [mapT2T fstTT M.cols]
adamc@370 65 (foldT2R2 [sndTT] [colMeta]
adamc@370 66 [fn cols => $(mapT2T (fn t :: (Type * Type) =>
adamc@370 67 sql_exp [T = [Id = int]
adamc@370 68 ++ mapT2T fstTT M.cols]
adamc@370 69 [] [] t.1) cols)]
adamc@370 70 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@370 71 [[nm] ~ rest] =>
adamc@370 72 fn input col acc => acc with nm =
adamc@403 73 @sql_inject col.Inject (col.Parse input))
adamc@370 74 {} [M.cols] inputs M.cols)
adamc@370 75 tab (WHERE T.Id = {id}));
adamc@370 76 return <xml><body>
adamc@370 77 Saved!
adamc@370 78 </body></xml>
adamc@370 79
adamc@370 80 fun update (id : int) =
adamc@370 81 fso <- oneOrNoRows (SELECT tab.{{mapT2T fstTT M.cols}} FROM tab WHERE tab.Id = {id});
adamc@370 82 case fso : (Basis.option {Tab : $(mapT2T fstTT M.cols)}) of
adamc@370 83 None => return <xml><body>Not found!</body></xml>
adamc@370 84 | Some fs => return <xml><body><form>
adamc@370 85 {foldT2R2 [fstTT] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
adamc@370 86 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@370 87 [[nm] ~ rest] (v : t.1) (col : colMeta t)
adamc@370 88 (acc : xml form [] (mapT2T sndTT rest)) =>
adamc@370 89 <xml>
adamc@370 90 <li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li>
adamc@370 91 {useMore acc}
adamc@370 92 </xml>)
adamc@370 93 <xml/>
adamc@370 94 [M.cols] fs.Tab M.cols}
adamc@370 95
adamc@370 96 <submit action={save id}/>
adamc@370 97 </form></body></xml>
adamc@370 98
adamc@370 99 fun delete (id : int) =
adamc@370 100 () <- dml (DELETE FROM tab WHERE Id = {id});
adamc@370 101 return <xml><body>
adamc@370 102 The deed is done.
adamc@370 103 </body></xml>
adamc@370 104
adamc@370 105 fun confirm (id : int) = return <xml><body>
adamc@403 106 <p>Are you sure you want to delete ID #{[id]}?</p>
adamc@370 107
adamc@370 108 <p><a link={delete id}>I was born sure!</a></p>
adamc@367 109 </body></xml>
adamc@339 110
adamc@370 111 fun main () =
adamc@370 112 rows <- queryX (SELECT * FROM tab AS T)
adamc@370 113 (fn (fs : {T : $([Id = int] ++ mapT2T fstTT M.cols)}) => <xml>
adamc@370 114 <tr>
adamc@403 115 <td>{[fs.T.Id]}</td>
adamc@370 116 {foldT2RX2 [fstTT] [colMeta] [tr]
adamc@370 117 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@370 118 [[nm] ~ rest] v col => <xml>
adamc@370 119 <td>{col.Show v}</td>
adamc@370 120 </xml>)
adamc@370 121 [M.cols] (fs.T -- #Id) M.cols}
adamc@370 122 <td>
adamc@370 123 <a link={update fs.T.Id}>[Update]</a>
adamc@370 124 <a link={confirm fs.T.Id}>[Delete]</a>
adamc@370 125 </td>
adamc@370 126 </tr>
adamc@370 127 </xml>);
adamc@370 128 return <xml><head>
adamc@370 129 <title>{cdata M.title}</title>
adamc@370 130 </head><body>
adamc@341 131
adamc@370 132 <h1>{cdata M.title}</h1>
adamc@341 133
adamc@370 134 <table border={1}>
adamc@370 135 <tr>
adamc@370 136 <th>ID</th>
adamc@370 137 {foldT2RX [colMeta] [tr]
adamc@370 138 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@370 139 [[nm] ~ rest] col => <xml>
adamc@370 140 <th>{cdata col.Nam}</th>
adamc@370 141 </xml>)
adamc@370 142 [M.cols] M.cols}
adamc@370 143 </tr>
adamc@370 144 {rows}
adamc@370 145 </table>
adamc@341 146
adamc@370 147 <br/>
adamc@337 148
adamc@370 149 <form>
adamc@370 150 {foldT2R [colMeta] [fn cols :: {(Type * Type)} => xml form [] (mapT2T sndTT cols)]
adamc@370 151 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
adamc@370 152 [[nm] ~ rest] (col : colMeta t) (acc : xml form [] (mapT2T sndTT rest)) => <xml>
adamc@370 153 <li> {cdata col.Nam}: {col.Widget [nm]}</li>
adamc@370 154 {useMore acc}
adamc@370 155 </xml>)
adamc@370 156 <xml/>
adamc@370 157 [M.cols] M.cols}
adamc@370 158
adamc@370 159 <submit action={create}/>
adamc@370 160 </form>
adamc@370 161 </body></xml>
adamc@325 162
adamc@325 163 end