]> matita.cs.unibo.it Git - helm.git/blobdiff - helm/ocaml/content_pres/content2pres.ml
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[helm.git] / helm / ocaml / content_pres / content2pres.ml
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+(* Copyright (C) 2003-2005, HELM Team.
+ * 
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ * 
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * 
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA  02111-1307, USA.
+ * 
+ * For details, see the HELM World-Wide-Web page,
+ * http://cs.unibo.it/helm/.
+ *)
+
+(***************************************************************************)
+(*                                                                         *)
+(*                            PROJECT HELM                                 *)
+(*                                                                         *)
+(*                Andrea Asperti <asperti@cs.unibo.it>                     *)
+(*                              17/06/2003                                 *)
+(*                                                                         *)
+(***************************************************************************)
+
+(* $Id$ *)
+
+module P = Mpresentation
+module B = Box
+module Con = Content
+
+let p_mtr a b = Mpresentation.Mtr(a,b)
+let p_mtd a b = Mpresentation.Mtd(a,b)
+let p_mtable a b = Mpresentation.Mtable(a,b)
+let p_mtext a b = Mpresentation.Mtext(a,b)
+let p_mi a b = Mpresentation.Mi(a,b)
+let p_mo a b = Mpresentation.Mo(a,b)
+let p_mrow a b = Mpresentation.Mrow(a,b)
+let p_mphantom a b = Mpresentation.Mphantom(a,b)
+
+let rec split n l =
+  if n = 0 then [],l
+  else let l1,l2 = 
+    split (n-1) (List.tl l) in
+    (List.hd l)::l1,l2
+  
+let get_xref = function
+  | `Declaration d  
+  | `Hypothesis d -> d.Con.dec_id
+  | `Proof p -> p.Con.proof_id
+  | `Definition d -> d.Con.def_id
+  | `Joint jo -> jo.Con.joint_id
+
+let hv_attrs =
+  RenderingAttrs.spacing_attributes `BoxML
+  @ RenderingAttrs.indent_attributes `BoxML
+
+let make_row items concl =
+  B.b_hv hv_attrs (items @ [ concl ])
+(*   match concl with 
+      B.V _ -> |+ big! +|
+        B.b_v attrs [B.b_h [] items; B.b_indent concl]
+    | _ ->  |+ small +|
+        B.b_h attrs (items@[B.b_space; concl]) *)
+
+let make_concl ?(attrs=[]) verb concl =
+  B.b_hv (hv_attrs @ attrs) [ B.b_kw verb; concl ]
+(*   match concl with 
+      B.V _ -> |+ big! +|
+        B.b_v attrs [ B.b_kw verb; B.b_indent concl]
+    | _ ->  |+ small +|
+        B.b_h attrs [ B.b_kw verb; B.b_space; concl ] *)
+
+let make_args_for_apply term2pres args =
+ let make_arg_for_apply is_first arg row = 
+  let res =
+   match arg with 
+      Con.Aux n -> assert false
+    | Con.Premise prem -> 
+        let name = 
+          (match prem.Con.premise_binder with
+             None -> "previous"
+           | Some s -> s) in
+        (B.b_object (P.Mi ([], name)))::row
+    | Con.Lemma lemma -> 
+        let lemma_attrs = [
+          Some "helm", "xref", lemma.Con.lemma_id;
+          Some "xlink", "href", lemma.Con.lemma_uri ]
+        in
+        (B.b_object (P.Mi(lemma_attrs,lemma.Con.lemma_name)))::row 
+    | Con.Term t -> 
+        if is_first then
+          (term2pres t)::row
+        else (B.b_object (P.Mi([],"_")))::row
+    | Con.ArgProof _ 
+    | Con.ArgMethod _ -> 
+       (B.b_object (P.Mi([],"_")))::row
+  in
+   if is_first then res else B.skip::res
+ in
+  match args with 
+    hd::tl -> 
+      make_arg_for_apply true hd 
+        (List.fold_right (make_arg_for_apply false) tl [])
+  | _ -> assert false
+
+let get_name = function
+  | Some s -> s
+  | None -> "_"
+
+let add_xref id = function
+  | B.Text (attrs, t) -> B.Text (((Some "helm", "xref", id) :: attrs), t)
+  | _ -> assert false (* TODO, add_xref is meaningful for all boxes *)
+
+let rec justification term2pres p = 
+  if ((p.Con.proof_conclude.Con.conclude_method = "Exact") or
+     ((p.Con.proof_context = []) &
+      (p.Con.proof_apply_context = []) &
+      (p.Con.proof_conclude.Con.conclude_method = "Apply"))) then
+    let pres_args = 
+      make_args_for_apply term2pres p.Con.proof_conclude.Con.conclude_args in
+    B.H([],
+      (B.b_kw "by")::B.b_space::
+      B.Text([],"(")::pres_args@[B.Text([],")")]) 
+  else proof2pres term2pres p 
+     
+and proof2pres term2pres p =
+  let rec proof2pres p =
+    let indent = 
+      let is_decl e = 
+        (match e with 
+           `Declaration _
+         | `Hypothesis _ -> true
+         | _ -> false) in
+      ((List.filter is_decl p.Con.proof_context) != []) in 
+    let omit_conclusion = (not indent) && (p.Con.proof_context != []) in
+    let concl = 
+      (match p.Con.proof_conclude.Con.conclude_conclusion with
+         None -> None
+       | Some t -> Some (term2pres t)) in
+    let body =
+        let presconclude = 
+          conclude2pres p.Con.proof_conclude indent omit_conclusion in
+        let presacontext = 
+          acontext2pres p.Con.proof_apply_context presconclude indent in
+        context2pres p.Con.proof_context presacontext in
+    match p.Con.proof_name with
+      None -> body
+    | Some name ->
+        let action = 
+         match concl with
+            None -> body
+          | Some ac ->
+             B.Action
+               ([None,"type","toggle"],
+                [(make_concl ~attrs:[Some "helm", "xref", p.Con.proof_id]
+                   "proof of" ac); body])
+        in
+        B.V ([],
+          [B.Text ([],"(" ^ name ^ ")");
+           B.indent action])
+
+  and context2pres c continuation =
+    (* we generate a subtable for each context element, for selection
+       purposes 
+       The table generated by the head-element does not have an xref;
+       the whole context-proof is already selectable *)
+    match c with
+      [] -> continuation
+    | hd::tl -> 
+        let continuation' =
+          List.fold_right
+            (fun ce continuation ->
+              let xref = get_xref ce in
+              B.V([Some "helm", "xref", xref ],
+                [B.H([Some "helm", "xref", "ce_"^xref],
+                     [ce2pres_in_proof_context_element ce]);
+                 continuation])) tl continuation in
+         let hd_xref= get_xref hd in
+         B.V([],
+             [B.H([Some "helm", "xref", "ce_"^hd_xref],
+               [ce2pres_in_proof_context_element hd]);
+             continuation'])
+        
+  and ce2pres_in_joint_context_element = function
+    | `Inductive _ -> assert false (* TODO *)
+    | (`Declaration _) as x -> ce2pres x
+    | (`Hypothesis _) as x  -> ce2pres x
+    | (`Proof _) as x       -> ce2pres x
+    | (`Definition _) as x  -> ce2pres x
+  
+  and ce2pres_in_proof_context_element = function 
+    | `Joint ho -> 
+      B.H ([],(List.map ce2pres_in_joint_context_element ho.Content.joint_defs))
+    | (`Declaration _) as x -> ce2pres x
+    | (`Hypothesis _) as x  -> ce2pres x
+    | (`Proof _) as x       -> ce2pres x
+    | (`Definition _) as x  -> ce2pres x
+  
+  and ce2pres = 
+    function 
+        `Declaration d -> 
+          (match d.Con.dec_name with
+              Some s ->
+                let ty = term2pres d.Con.dec_type in
+                B.H ([],
+                  [(B.b_kw "Assume");
+                   B.b_space;
+                   B.Object ([], P.Mi([],s));
+                   B.Text([],":");
+                   ty])
+            | None -> 
+                prerr_endline "NO NAME!!"; assert false)
+      | `Hypothesis h ->
+          (match h.Con.dec_name with
+              Some s ->
+                let ty = term2pres h.Con.dec_type in
+                B.H ([],
+                  [(B.b_kw "Suppose");
+                   B.b_space;
+                   B.Text([],"(");
+                   B.Object ([], P.Mi ([],s));
+                   B.Text([],")");
+                   B.b_space;
+                   ty])
+            | None -> 
+                prerr_endline "NO NAME!!"; assert false) 
+      | `Proof p -> 
+           proof2pres p 
+      | `Definition d -> 
+           (match d.Con.def_name with
+              Some s ->
+                let term = term2pres d.Con.def_term in
+                B.H ([],
+                  [ B.b_kw "Let"; B.b_space;
+                    B.Object ([], P.Mi([],s));
+                    B.Text([]," = ");
+                    term])
+            | None -> 
+                prerr_endline "NO NAME!!"; assert false) 
+
+  and acontext2pres ac continuation indent =
+    List.fold_right
+      (fun p continuation ->
+         let hd = 
+           if indent then
+             B.indent (proof2pres p)
+           else 
+             proof2pres p in
+         B.V([Some "helm","xref",p.Con.proof_id],
+           [B.H([Some "helm","xref","ace_"^p.Con.proof_id],[hd]);
+            continuation])) ac continuation 
+
+  and conclude2pres conclude indent omit_conclusion =
+    let tconclude_body = 
+      match conclude.Con.conclude_conclusion with
+        Some t when
+         not omit_conclusion or
+         (* CSC: I ignore the omit_conclusion flag in this case.   *)
+         (* CSC: Is this the correct behaviour? In the stylesheets *)
+         (* CSC: we simply generated nothing (i.e. the output type *)
+         (* CSC: of the function should become an option.          *)
+         conclude.Con.conclude_method = "BU_Conversion" ->
+          let concl = (term2pres t) in 
+          if conclude.Con.conclude_method = "BU_Conversion" then
+            make_concl "that is equivalent to" concl
+          else if conclude.Con.conclude_method = "FalseInd" then
+           (* false ind is in charge to add the conclusion *)
+           falseind conclude
+          else  
+            let conclude_body = conclude_aux conclude in
+            let ann_concl = 
+              if conclude.Con.conclude_method = "TD_Conversion" then
+                 make_concl "that is equivalent to" concl 
+              else make_concl "we conclude" concl in
+            B.V ([], [conclude_body; ann_concl])
+      | _ -> conclude_aux conclude in
+    if indent then 
+      B.indent (B.H ([Some "helm", "xref", conclude.Con.conclude_id],
+                    [tconclude_body]))
+    else 
+      B.H ([Some "helm", "xref", conclude.Con.conclude_id],[tconclude_body])
+
+  and conclude_aux conclude =
+    if conclude.Con.conclude_method = "TD_Conversion" then
+      let expected = 
+        (match conclude.Con.conclude_conclusion with 
+           None -> B.Text([],"NO EXPECTED!!!")
+         | Some c -> term2pres c) in
+      let subproof = 
+        (match conclude.Con.conclude_args with
+          [Con.ArgProof p] -> p
+         | _ -> assert false) in
+      let synth = 
+        (match subproof.Con.proof_conclude.Con.conclude_conclusion with
+           None -> B.Text([],"NO SYNTH!!!")
+         | Some c -> (term2pres c)) in
+      B.V 
+        ([],
+        [make_concl "we must prove" expected;
+         make_concl "or equivalently" synth;
+         proof2pres subproof])
+    else if conclude.Con.conclude_method = "BU_Conversion" then
+      assert false
+    else if conclude.Con.conclude_method = "Exact" then
+      let arg = 
+        (match conclude.Con.conclude_args with 
+           [Con.Term t] -> term2pres t
+         | [Con.Premise p] -> 
+             (match p.Con.premise_binder with
+             | None -> assert false; (* unnamed hypothesis ??? *)
+             | Some s -> B.Text([],s))
+         | err -> assert false) in
+      (match conclude.Con.conclude_conclusion with 
+         None ->
+          B.b_h [] [B.b_kw "Consider"; B.b_space; arg]
+       | Some c -> let conclusion = term2pres c in
+          make_row 
+            [arg; B.b_space; B.b_kw "proves"]
+            conclusion
+       )
+    else if conclude.Con.conclude_method = "Intros+LetTac" then
+      (match conclude.Con.conclude_args with
+         [Con.ArgProof p] -> proof2pres p
+       | _ -> assert false)
+(* OLD CODE 
+      let conclusion = 
+      (match conclude.Con.conclude_conclusion with 
+         None -> B.Text([],"NO Conclusion!!!")
+       | Some c -> term2pres c) in
+      (match conclude.Con.conclude_args with
+         [Con.ArgProof p] -> 
+           B.V 
+            ([None,"align","baseline 1"; None,"equalrows","false";
+              None,"columnalign","left"],
+              [B.H([],[B.Object([],proof2pres p)]);
+               B.H([],[B.Object([],
+                (make_concl "we proved 1" conclusion))])]);
+       | _ -> assert false)
+*)
+    else if (conclude.Con.conclude_method = "Case") then
+      case conclude
+    else if (conclude.Con.conclude_method = "ByInduction") then
+      byinduction conclude
+    else if (conclude.Con.conclude_method = "Exists") then
+      exists conclude
+    else if (conclude.Con.conclude_method = "AndInd") then
+      andind conclude
+    else if (conclude.Con.conclude_method = "FalseInd") then
+      falseind conclude
+    else if (conclude.Con.conclude_method = "Rewrite") then
+      let justif = 
+        (match (List.nth conclude.Con.conclude_args 6) with
+           Con.ArgProof p -> justification term2pres p
+         | _ -> assert false) in
+      let term1 = 
+        (match List.nth conclude.Con.conclude_args 2 with
+           Con.Term t -> term2pres t
+         | _ -> assert false) in 
+      let term2 = 
+        (match List.nth conclude.Con.conclude_args 5 with
+           Con.Term t -> term2pres t
+         | _ -> assert false) in
+      B.V ([], 
+         [B.H ([],[
+          (B.b_kw "rewrite");
+          B.b_space; term1;
+          B.b_space; (B.b_kw "with");
+          B.b_space; term2;
+          B.indent justif])])
+    else if conclude.Con.conclude_method = "Apply" then
+      let pres_args = 
+        make_args_for_apply term2pres conclude.Con.conclude_args in
+      B.H([],
+        (B.b_kw "by")::
+        B.b_space::
+        B.Text([],"(")::pres_args@[B.Text([],")")])
+    else 
+      B.V ([], [
+        B.b_kw ("Apply method" ^ conclude.Con.conclude_method ^ " to");
+        (B.indent (B.V ([], args2pres conclude.Con.conclude_args)))])
+
+  and args2pres l = List.map arg2pres l
+
+  and arg2pres =
+    function
+        Con.Aux n -> B.b_kw ("aux " ^ n)
+      | Con.Premise prem -> B.b_kw "premise"
+      | Con.Lemma lemma -> B.b_kw "lemma"
+      | Con.Term t -> term2pres t
+      | Con.ArgProof p -> proof2pres p 
+      | Con.ArgMethod s -> B.b_kw "method"
+   and case conclude =
+     let proof_conclusion = 
+       (match conclude.Con.conclude_conclusion with
+          None -> B.b_kw "No conclusion???"
+        | Some t -> term2pres t) in
+     let arg,args_for_cases = 
+       (match conclude.Con.conclude_args with
+           Con.Aux(_)::Con.Aux(_)::Con.Term(_)::arg::tl ->
+             arg,tl
+         | _ -> assert false) in
+     let case_on =
+       let case_arg = 
+         (match arg with
+            Con.Aux n -> B.b_kw "an aux???"
+           | Con.Premise prem ->
+              (match prem.Con.premise_binder with
+                 None -> B.b_kw "the previous result"
+               | Some n -> B.Object ([], P.Mi([],n)))
+           | Con.Lemma lemma -> B.Object ([], P.Mi([],lemma.Con.lemma_name))
+           | Con.Term t -> 
+               term2pres t
+           | Con.ArgProof p -> B.b_kw "a proof???"
+           | Con.ArgMethod s -> B.b_kw "a method???")
+      in
+        (make_concl "we proceed by cases on" case_arg) in
+     let to_prove =
+        (make_concl "to prove" proof_conclusion) in
+     B.V ([], case_on::to_prove::(make_cases args_for_cases))
+
+   and byinduction conclude =
+     let proof_conclusion = 
+       (match conclude.Con.conclude_conclusion with
+          None -> B.b_kw "No conclusion???"
+        | Some t -> term2pres t) in
+     let inductive_arg,args_for_cases = 
+       (match conclude.Con.conclude_args with
+           Con.Aux(n)::_::tl ->
+             let l1,l2 = split (int_of_string n) tl in
+             let last_pos = (List.length l2)-1 in
+             List.nth l2 last_pos,l1
+         | _ -> assert false) in
+     let induction_on =
+       let arg = 
+         (match inductive_arg with
+            Con.Aux n -> B.b_kw "an aux???"
+           | Con.Premise prem ->
+              (match prem.Con.premise_binder with
+                 None -> B.b_kw "the previous result"
+               | Some n -> B.Object ([], P.Mi([],n)))
+           | Con.Lemma lemma -> B.Object ([], P.Mi([],lemma.Con.lemma_name))
+           | Con.Term t -> 
+               term2pres t
+           | Con.ArgProof p -> B.b_kw "a proof???"
+           | Con.ArgMethod s -> B.b_kw "a method???") in
+        (make_concl "we proceed by induction on" arg) in
+     let to_prove =
+        (make_concl "to prove" proof_conclusion) in
+     B.V ([], induction_on::to_prove:: (make_cases args_for_cases))
+
+    and make_cases l = List.map make_case l
+
+    and make_case =  
+      function 
+        Con.ArgProof p ->
+          let name =
+            (match p.Con.proof_name with
+               None -> B.b_kw "no name for case!!"
+             | Some n -> B.Object ([], P.Mi([],n))) in
+          let indhyps,args =
+             List.partition 
+               (function
+                   `Hypothesis h -> h.Con.dec_inductive
+                 | _ -> false) p.Con.proof_context in
+          let pattern_aux =
+             List.fold_right
+               (fun e p -> 
+                  let dec  = 
+                    (match e with 
+                       `Declaration h 
+                     | `Hypothesis h -> 
+                         let name = 
+                           (match h.Con.dec_name with
+                              None -> "NO NAME???"
+                           | Some n ->n) in
+                         [B.b_space;
+                          B.Object ([], P.Mi ([],name));
+                          B.Text([],":");
+                          (term2pres h.Con.dec_type)]
+                     | _ -> [B.Text ([],"???")]) in
+                  dec@p) args [] in
+          let pattern = 
+            B.H ([],
+               (B.b_kw "Case"::B.b_space::name::pattern_aux)@
+                [B.b_space;
+                 B.Text([], Utf8Macro.unicode_of_tex "\\Rightarrow")]) in
+          let subconcl = 
+            (match p.Con.proof_conclude.Con.conclude_conclusion with
+               None -> B.b_kw "No conclusion!!!"
+             | Some t -> term2pres t) in
+          let asubconcl = B.indent (make_concl "the thesis becomes" subconcl) in
+          let induction_hypothesis = 
+            (match indhyps with
+              [] -> []
+            | _ -> 
+               let text = B.indent (B.b_kw "by induction hypothesis we know") in
+               let make_hyp =
+                 function 
+                   `Hypothesis h ->
+                     let name = 
+                       (match h.Con.dec_name with
+                          None -> "no name"
+                        | Some s -> s) in
+                     B.indent (B.H ([],
+                       [B.Text([],"(");
+                        B.Object ([], P.Mi ([],name));
+                        B.Text([],")");
+                        B.b_space;
+                        term2pres h.Con.dec_type]))
+                   | _ -> assert false in
+               let hyps = List.map make_hyp indhyps in
+               text::hyps) in          
+          (* let acontext = 
+               acontext2pres_old p.Con.proof_apply_context true in *)
+          let body = conclude2pres p.Con.proof_conclude true false in
+          let presacontext = 
+           let acontext_id =
+            match p.Con.proof_apply_context with
+               [] -> p.Con.proof_conclude.Con.conclude_id
+             | {Con.proof_id = id}::_ -> id
+           in
+            B.Action([None,"type","toggle"],
+              [ B.indent (add_xref acontext_id (B.b_kw "Proof"));
+                acontext2pres p.Con.proof_apply_context body true]) in
+          B.V ([], pattern::asubconcl::induction_hypothesis@[presacontext])
+       | _ -> assert false 
+
+     and falseind conclude =
+       let proof_conclusion = 
+         (match conclude.Con.conclude_conclusion with
+            None -> B.b_kw "No conclusion???"
+          | Some t -> term2pres t) in
+       let case_arg = 
+         (match conclude.Con.conclude_args with
+             [Con.Aux(n);_;case_arg] -> case_arg
+           | _ -> assert false;
+             (* 
+             List.map (ContentPp.parg 0) conclude.Con.conclude_args;
+             assert false *)) in
+       let arg = 
+         (match case_arg with
+             Con.Aux n -> assert false
+           | Con.Premise prem ->
+              (match prem.Con.premise_binder with
+                 None -> [B.b_kw "Contradiction, hence"]
+               | Some n -> 
+                   [ B.Object ([],P.Mi([],n)); B.skip;
+                     B.b_kw "is contradictory, hence"])
+           | Con.Lemma lemma -> 
+               [ B.Object ([], P.Mi([],lemma.Con.lemma_name)); B.skip;
+                 B.b_kw "is contradictory, hence" ]
+           | _ -> assert false) in
+            (* let body = proof2pres {proof with Con.proof_context = tl} in *)
+       make_row arg proof_conclusion
+
+     and andind conclude =
+       let proof,case_arg = 
+         (match conclude.Con.conclude_args with
+             [Con.Aux(n);_;Con.ArgProof proof;case_arg] -> proof,case_arg
+           | _ -> assert false;
+             (* 
+             List.map (ContentPp.parg 0) conclude.Con.conclude_args;
+             assert false *)) in
+       let arg = 
+         (match case_arg with
+             Con.Aux n -> assert false
+           | Con.Premise prem ->
+              (match prem.Con.premise_binder with
+                 None -> []
+               | Some n -> [(B.b_kw "by"); B.b_space; B.Object([], P.Mi([],n))])
+           | Con.Lemma lemma -> 
+               [(B.b_kw "by");B.skip;
+                B.Object([], P.Mi([],lemma.Con.lemma_name))]
+           | _ -> assert false) in
+       match proof.Con.proof_context with
+         `Hypothesis hyp1::`Hypothesis hyp2::tl ->
+            let get_name hyp =
+              (match hyp.Con.dec_name with
+                None -> "_"
+              | Some s -> s) in
+            let preshyp1 = 
+              B.H ([],
+               [B.Text([],"(");
+                B.Object ([], P.Mi([],get_name hyp1));
+                B.Text([],")");
+                B.skip;
+                term2pres hyp1.Con.dec_type]) in
+            let preshyp2 = 
+              B.H ([],
+               [B.Text([],"(");
+                B.Object ([], P.Mi([],get_name hyp2));
+                B.Text([],")");
+                B.skip;
+                term2pres hyp2.Con.dec_type]) in
+            (* let body = proof2pres {proof with Con.proof_context = tl} in *)
+            let body = conclude2pres proof.Con.proof_conclude false true in
+            let presacontext = 
+              acontext2pres proof.Con.proof_apply_context body false in
+            B.V 
+              ([],
+               [B.H ([],arg@[B.skip; B.b_kw "we have"]);
+                preshyp1;
+                B.b_kw "and";
+                preshyp2;
+                presacontext]);
+         | _ -> assert false
+
+     and exists conclude =
+       let proof = 
+         (match conclude.Con.conclude_args with
+             [Con.Aux(n);_;Con.ArgProof proof;_] -> proof
+           | _ -> assert false;
+             (* 
+             List.map (ContentPp.parg 0) conclude.Con.conclude_args;
+             assert false *)) in
+       match proof.Con.proof_context with
+           `Declaration decl::`Hypothesis hyp::tl
+         | `Hypothesis decl::`Hypothesis hyp::tl ->
+           let get_name decl =
+             (match decl.Con.dec_name with
+                None -> "_"
+              | Some s -> s) in
+           let presdecl = 
+             B.H ([],
+               [(B.b_kw "let");
+                B.skip;
+                B.Object ([], P.Mi([],get_name decl));
+                B.Text([],":"); term2pres decl.Con.dec_type]) in
+           let suchthat =
+             B.H ([],
+               [(B.b_kw "such that");
+                B.skip;
+                B.Text([],"(");
+                B.Object ([], P.Mi([],get_name hyp));
+                B.Text([],")");
+                B.skip;
+                term2pres hyp.Con.dec_type]) in
+            (* let body = proof2pres {proof with Con.proof_context = tl} in *)
+            let body = conclude2pres proof.Con.proof_conclude false true in
+            let presacontext = 
+              acontext2pres proof.Con.proof_apply_context body false in
+            B.V 
+              ([],
+               [presdecl;
+                suchthat;
+                presacontext]);
+         | _ -> assert false
+
+    in
+    proof2pres p
+
+exception ToDo
+
+let counter = ref 0
+
+let conjecture2pres term2pres (id, n, context, ty) =
+  (B.b_h [Some "helm", "xref", id]
+     (((List.map
+          (function
+             | None ->
+                B.b_h []
+                   [ B.b_object (p_mi [] "_") ;
+                     B.b_object (p_mo [] ":?") ;
+                     B.b_object (p_mi [] "_")]
+             | Some (`Declaration d)
+             | Some (`Hypothesis d) ->
+                let { Content.dec_name =
+                    dec_name ; Content.dec_type = ty } = d
+                in
+                  B.b_h []
+                     [ B.b_object
+                        (p_mi []
+                           (match dec_name with
+                                None -> "_"
+                              | Some n -> n));
+                       B.b_text [] ":";
+                       term2pres ty ]
+             | Some (`Definition d) ->
+                 let
+                     { Content.def_name = def_name ;
+                       Content.def_term = bo } = d
+                 in
+                   B.b_h []
+                     [ B.b_object (p_mi []
+                                    (match def_name with
+                                         None -> "_"
+                                       | Some n -> n)) ;
+                       B.b_text [] (Utf8Macro.unicode_of_tex "\\Assign");
+                       term2pres bo]
+             | Some (`Proof p) ->
+                 let proof_name = p.Content.proof_name in
+                   B.b_h []
+                     [ B.b_object (p_mi []
+                                    (match proof_name with
+                                         None -> "_"
+                                       | Some n -> n)) ;
+                       B.b_text [] (Utf8Macro.unicode_of_tex "\\Assign");
+                       proof2pres term2pres p])
+          (List.rev context)) @
+         [ B.b_text [] (Utf8Macro.unicode_of_tex "\\vdash");
+           B.b_object (p_mi [] (string_of_int n)) ;
+           B.b_text [] ":" ;
+           term2pres ty ])))
+
+let metasenv2pres term2pres = function
+  | None -> []
+  | Some metasenv' ->
+      (* Conjectures are in their own table to make *)
+      (* diffing the DOM trees easier.              *)
+      [B.b_v []
+        ((B.b_kw ("Conjectures:" ^
+            (let _ = incr counter; in (string_of_int !counter)))) ::
+         (List.map (conjecture2pres term2pres) metasenv'))]
+
+let params2pres params =
+  let param2pres uri =
+    B.b_text [Some "xlink", "href", UriManager.string_of_uri uri]
+      (UriManager.name_of_uri uri)
+  in
+  let rec spatiate = function
+    | [] -> []
+    | hd :: [] -> [hd]
+    | hd :: tl -> hd :: B.b_text [] ", " :: spatiate tl
+  in
+  match params with
+  | [] -> []
+  | p ->
+      let params = spatiate (List.map param2pres p) in
+      [B.b_space;
+       B.b_h [] (B.b_text [] "[" :: params @ [ B.b_text [] "]" ])]
+
+let recursion_kind2pres params kind =
+  let kind =
+    match kind with
+    | `Recursive _ -> "Recursive definition"
+    | `CoRecursive -> "CoRecursive definition"
+    | `Inductive _ -> "Inductive definition"
+    | `CoInductive _ -> "CoInductive definition"
+  in
+  B.b_h [] (B.b_kw kind :: params2pres params)
+
+let inductive2pres term2pres ind =
+  let constructor2pres decl =
+    B.b_h [] [
+      B.b_text [] ("| " ^ get_name decl.Content.dec_name ^ ":");
+      B.b_space;
+      term2pres decl.Content.dec_type
+    ]
+  in
+  B.b_v []
+    (B.b_h [] [
+      B.b_kw (ind.Content.inductive_name ^ " of arity");
+      B.smallskip;
+      term2pres ind.Content.inductive_type ]
+    :: List.map constructor2pres ind.Content.inductive_constructors)
+
+let joint_def2pres term2pres def =
+  match def with
+  | `Inductive ind -> inductive2pres term2pres ind
+  | _ -> assert false (* ZACK or raise ToDo? *)
+
+let content2pres term2pres (id,params,metasenv,obj) =
+  match obj with
+  | `Def (Content.Const, thesis, `Proof p) ->
+      let name = get_name p.Content.proof_name in
+      B.b_v
+        [Some "helm","xref","id"]
+        ([ B.b_h [] (B.b_kw ("Proof " ^ name) :: params2pres params);
+           B.b_kw "Thesis:";
+           B.indent (term2pres thesis) ] @
+         metasenv2pres term2pres metasenv @
+         [proof2pres term2pres p])
+  | `Def (_, ty, `Definition body) ->
+      let name = get_name body.Content.def_name in
+      B.b_v
+        [Some "helm","xref","id"]
+        ([B.b_h [] (B.b_kw ("Definition " ^ name) :: params2pres params);
+          B.b_kw "Type:";
+          B.indent (term2pres ty)] @
+          metasenv2pres term2pres metasenv @
+          [B.b_kw "Body:"; term2pres body.Content.def_term])
+  | `Decl (_, `Declaration decl)
+  | `Decl (_, `Hypothesis decl) ->
+      let name = get_name decl.Content.dec_name in
+      B.b_v
+        [Some "helm","xref","id"]
+        ([B.b_h [] (B.b_kw ("Axiom " ^ name) :: params2pres params);
+          B.b_kw "Type:";
+          B.indent (term2pres decl.Content.dec_type)] @
+          metasenv2pres term2pres metasenv)
+  | `Joint joint ->
+      B.b_v []
+        (recursion_kind2pres params joint.Content.joint_kind
+        :: List.map (joint_def2pres term2pres) joint.Content.joint_defs)
+  | _ -> raise ToDo
+
+let content2pres ~ids_to_inner_sorts =
+  content2pres
+    (fun annterm ->
+      let ast, ids_to_uris =
+        TermAcicContent.ast_of_acic ids_to_inner_sorts annterm
+      in
+      CicNotationPres.box_of_mpres
+        (CicNotationPres.render ids_to_uris
+          (TermContentPres.pp_ast ast)))
+