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Kind-polymorphic [fst] and friends
author Adam Chlipala <adamc@hcoop.net>
date Thu, 26 Feb 2009 16:16:54 -0500
parents 6c4643880df5
children 1fb318c17546
comparison
equal deleted inserted replaced
636:de8333ef1a0c 637:24fd1edfcaa3
33 functor Make(M : sig 33 functor Make(M : sig
34 con cols :: {(Type * Type)} 34 con cols :: {(Type * Type)}
35 constraint [Id] ~ cols 35 constraint [Id] ~ cols
36 val fl : folder cols 36 val fl : folder cols
37 37
38 val tab : sql_table ([Id = int] ++ map fstTT cols) 38 val tab : sql_table ([Id = int] ++ map fst cols)
39 39
40 val title : string 40 val title : string
41 41
42 val cols : colsMeta cols 42 val cols : colsMeta cols
43 end) = struct 43 end) = struct
47 47
48 sequence seq 48 sequence seq
49 49
50 fun list () = 50 fun list () =
51 rows <- queryX (SELECT * FROM tab AS T) 51 rows <- queryX (SELECT * FROM tab AS T)
52 (fn (fs : {T : $([Id = int] ++ map fstTT M.cols)}) => <xml> 52 (fn (fs : {T : $([Id = int] ++ map fst M.cols)}) => <xml>
53 <tr> 53 <tr>
54 <td>{[fs.T.Id]}</td> 54 <td>{[fs.T.Id]}</td>
55 {foldRX2 [fstTT] [colMeta] [tr] 55 {foldRX2 [fst] [colMeta] [tr]
56 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) 56 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
57 [[nm] ~ rest] v col => <xml> 57 [[nm] ~ rest] v col => <xml>
58 <td>{col.Show v}</td> 58 <td>{col.Show v}</td>
59 </xml>) 59 </xml>)
60 [M.cols] M.fl (fs.T -- #Id) M.cols} 60 [M.cols] M.fl (fs.T -- #Id) M.cols}
79 </table> 79 </table>
80 80
81 <br/><hr/><br/> 81 <br/><hr/><br/>
82 82
83 <form> 83 <form>
84 {foldR [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map sndTT cols)] 84 {foldR [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map snd cols)]
85 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) 85 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
86 [[nm] ~ rest] (col : colMeta t) (acc : xml form [] (map sndTT rest)) => <xml> 86 [[nm] ~ rest] (col : colMeta t) (acc : xml form [] (map snd rest)) => <xml>
87 <li> {cdata col.Nam}: {col.Widget [nm]}</li> 87 <li> {cdata col.Nam}: {col.Widget [nm]}</li>
88 {useMore acc} 88 {useMore acc}
89 </xml>) 89 </xml>)
90 <xml/> 90 <xml/>
91 [M.cols] M.fl M.cols} 91 [M.cols] M.fl M.cols}
92 92
93 <submit action={create}/> 93 <submit action={create}/>
94 </form> 94 </form>
95 </xml> 95 </xml>
96 96
97 and create (inputs : $(map sndTT M.cols)) = 97 and create (inputs : $(map snd M.cols)) =
98 id <- nextval seq; 98 id <- nextval seq;
99 dml (insert tab 99 dml (insert tab
100 (foldR2 [sndTT] [colMeta] 100 (foldR2 [snd] [colMeta]
101 [fn cols => $(map (fn t :: (Type * Type) => 101 [fn cols => $(map (fn t :: (Type * Type) =>
102 sql_exp [] [] [] t.1) cols)] 102 sql_exp [] [] [] t.1) cols)]
103 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) 103 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
104 [[nm] ~ rest] => 104 [[nm] ~ rest] =>
105 fn input col acc => acc ++ {nm = @sql_inject col.Inject (col.Parse input)}) 105 fn input col acc => acc ++ {nm = @sql_inject col.Inject (col.Parse input)})
112 {ls} 112 {ls}
113 </body></xml> 113 </body></xml>
114 114
115 and upd (id : int) = 115 and upd (id : int) =
116 let 116 let
117 fun save (inputs : $(map sndTT M.cols)) = 117 fun save (inputs : $(map snd M.cols)) =
118 dml (update [map fstTT M.cols] ! 118 dml (update [map fst M.cols] !
119 (foldR2 [sndTT] [colMeta] 119 (foldR2 [snd] [colMeta]
120 [fn cols => $(map (fn t :: (Type * Type) => 120 [fn cols => $(map (fn t :: (Type * Type) =>
121 sql_exp [T = [Id = int] 121 sql_exp [T = [Id = int]
122 ++ map fstTT M.cols] 122 ++ map fst M.cols]
123 [] [] t.1) cols)] 123 [] [] t.1) cols)]
124 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) 124 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
125 [[nm] ~ rest] => 125 [[nm] ~ rest] =>
126 fn input col acc => acc ++ {nm = 126 fn input col acc => acc ++ {nm =
127 @sql_inject col.Inject (col.Parse input)}) 127 @sql_inject col.Inject (col.Parse input)})
132 <p>Saved!</p> 132 <p>Saved!</p>
133 133
134 {ls} 134 {ls}
135 </body></xml> 135 </body></xml>
136 in 136 in
137 fso <- oneOrNoRows (SELECT tab.{{map fstTT M.cols}} FROM tab WHERE tab.Id = {[id]}); 137 fso <- oneOrNoRows (SELECT tab.{{map fst M.cols}} FROM tab WHERE tab.Id = {[id]});
138 case fso : (Basis.option {Tab : $(map fstTT M.cols)}) of 138 case fso : (Basis.option {Tab : $(map fst M.cols)}) of
139 None => return <xml><body>Not found!</body></xml> 139 None => return <xml><body>Not found!</body></xml>
140 | Some fs => return <xml><body><form> 140 | Some fs => return <xml><body><form>
141 {foldR2 [fstTT] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map sndTT cols)] 141 {foldR2 [fst] [colMeta] [fn cols :: {(Type * Type)} => xml form [] (map snd cols)]
142 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)}) 142 (fn (nm :: Name) (t :: (Type * Type)) (rest :: {(Type * Type)})
143 [[nm] ~ rest] (v : t.1) (col : colMeta t) 143 [[nm] ~ rest] (v : t.1) (col : colMeta t)
144 (acc : xml form [] (map sndTT rest)) => 144 (acc : xml form [] (map snd rest)) =>
145 <xml> 145 <xml>
146 <li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li> 146 <li> {cdata col.Nam}: {col.WidgetPopulated [nm] v}</li>
147 {useMore acc} 147 {useMore acc}
148 </xml>) 148 </xml>)
149 <xml/> 149 <xml/>