- let outputhtml = (rendering_window#outputhtml : GHtml.xmhtml) in
- let inputt = (rendering_window#inputt : GEdit.text) in
- let inputlen = inputt#length in
- let input = inputt#get_chars 0 inputlen in
- let level = int_of_string input in
- let metasenv =
- match !ProofEngine.proof with
- None -> assert false
- | Some (_,metasenv,_,_) -> metasenv
- in
- let result =
- match !ProofEngine.goal with
- | None -> ""
- | Some metano ->
- let (_, ey ,ty) =
- List.find (function (m,_,_) -> m=metano) metasenv
- in
- MQueryGenerator.backward metasenv ey ty level
- in
- output_html outputhtml result
+ let outputhtml = (rendering_window#outputhtml : GHtml.xmhtml) in
+ let inputt = (rendering_window#inputt : GEdit.text) in
+ let inputlen = inputt#length in
+ let input = inputt#get_chars 0 inputlen in
+ let level = int_of_string input in
+ let metasenv =
+ match !ProofEngine.proof with
+ None -> assert false
+ | Some (_,metasenv,_,_) -> metasenv
+ in
+ try
+ match !ProofEngine.goal with
+ None -> ()
+ | Some metano ->
+ let (_, ey ,ty) = List.find (function (m,_,_) -> m=metano) metasenv in
+ let MathQL.MQRefs uris, html =
+ MQueryGenerator.backward metasenv ey ty level
+ in
+ output_html outputhtml html ;
+ let uri' = user_uri_choice uris in
+ inputt#delete_text 0 inputlen ;
+ ignore ((inputt#insert_text uri') ~pos:0)
+ with
+ e ->
+ output_html outputhtml
+ ("<h1 color=\"red\">" ^ Printexc.to_string e ^ "</h1>")