src/Pure/Thy/thm_deps.ML
author wenzelm
Mon, 25 Feb 2008 19:48:06 +0100
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thm_deps: sort result;
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(*  Title:      Pure/Thy/thm_deps.ML
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    ID:         $Id$
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    Author:     Stefan Berghofer, TU Muenchen
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Visualize dependencies of theorems.
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*)
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signature BASIC_THM_DEPS =
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sig
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  val thm_deps : thm list -> unit
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end;
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signature THM_DEPS =
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sig
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  include BASIC_THM_DEPS
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  val enable : unit -> unit
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  val disable : unit -> unit
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end;
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structure ThmDeps : THM_DEPS =
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struct
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open Proofterm;
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fun enable () = if ! proofs = 0 then proofs := 1 else ();
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fun disable () = proofs := 0;
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fun dest_thm_axm (PThm (name, prf, _, _)) = (name, prf)
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  | dest_thm_axm (PAxm (name, _, _)) = (name ^ " (Ax)", MinProof ([], [], []))
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  | dest_thm_axm _ = ("", MinProof ([], [], []));
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fun make_deps_graph (AbsP (_, _, prf)) = make_deps_graph prf
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  | make_deps_graph (Abst (_, _, prf)) = make_deps_graph prf
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  | make_deps_graph (prf1 %% prf2) = make_deps_graph prf1 #> make_deps_graph prf2
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  | make_deps_graph (prf % _) = make_deps_graph prf
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  | make_deps_graph (MinProof (thms, axms, _)) =
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      fold (make_deps_graph o Proofterm.proof_of_min_thm) thms #>
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      fold (make_deps_graph o Proofterm.proof_of_min_axm) axms
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  | make_deps_graph prf = (fn p as (gra, parents) =>
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      let val (name, prf') = dest_thm_axm prf
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      in
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        if name <> "" then
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          if not (Symtab.defined gra name) then
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            let
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              val (gra', parents') = make_deps_graph prf' (gra, []);
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              val prefx = #1 (Library.split_last (NameSpace.explode name));
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              val session =
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                (case prefx of
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                  (x :: _) =>
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                    (case ThyInfo.lookup_theory x of
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                      SOME thy =>
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                        let val name = Present.session_name thy
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                        in if name = "" then [] else [name] end
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                    | NONE => [])
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                 | _ => ["global"]);
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            in
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              if member (op =) parents' name then (gra', parents union parents')
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              else (Symtab.update (name,
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                {name = Sign.base_name name, ID = name,
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                 dir = space_implode "/" (session @ prefx),
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                 unfold = false, path = "", parents = parents'}) gra',
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               insert (op =) name parents)
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            end
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          else (gra, insert (op =) name parents)
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        else
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          make_deps_graph prf' (gra, parents)
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      end);
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fun thm_deps thms =
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  Present.display_graph
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    (map snd (sort_wrt fst (Symtab.dest (fst
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      (fold make_deps_graph (map Thm.proof_of thms) (Symtab.empty, []))))));
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end;
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structure BasicThmDeps : BASIC_THM_DEPS = ThmDeps;
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open BasicThmDeps;