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| author |  Adam Chlipala <adamc@hcoop.net> | 2009-03-10 12:44:40 -0400 |
|---|---|---|
| committer | Adam Chlipala <adamc@hcoop.net> | 2009-03-10 12:44:40 -0400 |
| commit | 18c2f489867bf282c49346eb090b22e41ec5f67a (patch) | |
| tree | 82f3cb492c30ab735fe779934eca0e58a1e6b461 /demo/listEdit.ur | |
| parent | 998ec0f6506d8b7065fbe277c253188b38bcac7c (diff) | |
ListEdit demo, minus prose
Diffstat (limited to 'demo/listEdit.ur')
| -rw-r--r-- | demo/listEdit.ur | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/demo/listEdit.ur b/demo/listEdit.ur new file mode 100644 index 00000000..1a9851a7 --- /dev/null +++ b/demo/listEdit.ur @@ -0,0 +1,54 @@ +datatype rlist = Nil | Cons of {Data : source string, + NewData : source string, + Tail : source rlist} + +fun showString ss = + s <- signal ss; + return <xml>{[s]}</xml> + +fun show rls = + v <- signal rls; + show' v + +and show' rl = + case rl of + Nil => return <xml/> + | Cons {Data = ss, NewData = ss', Tail = rls} => return <xml> + <dyn signal={showString ss}/> + <button value="Change to:" onclick={s <- get ss'; set ss s}/> + <ctextbox source={ss'}/><br/> + <dyn signal={show rls}/> + </xml> + +fun main () = + head <- source Nil; + tailP <- source head; + data <- source ""; + + let + fun add () = + data <- get data; + data <- source data; + ndata <- source ""; + tail <- get tailP; + tail' <- source Nil; + + let + val cons = Cons {Data = data, NewData = ndata, Tail = tail'} + in + set tail cons; + set tailP tail'; + + head' <- get head; + case head' of + Nil => set head cons + | _ => return () + end + in + return <xml><body> + <ctextbox source={data}/> <button value="Add" onclick={add ()}/><br/> + <br/> + + <dyn signal={show head}/> + </body></xml> + end |