91 lines
2.4 KiB
Plaintext
91 lines
2.4 KiB
Plaintext
(*
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* Copyright 2014, NICTA
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*
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* This software may be distributed and modified according to the terms of
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* the BSD 2-Clause license. Note that NO WARRANTY is provided.
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* See "LICENSE_BSD2.txt" for details.
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*
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* @TAG(NICTA_BSD)
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*)
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(* Miscellaneous Isabelle tools. *)
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theory NICTATools
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imports
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Apply_Trace_Cmd
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Apply_Debug
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Find_Names
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(* Solves_Tac *)
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Rule_By_Method
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Eisbach_Methods
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TSubst
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Time_Methods_Cmd
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Try_Attribute
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Trace_Schematic_Insts
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Insulin
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ShowTypes
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AutoLevity_Hooks
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Locale_Abbrev
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begin
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section "Detect unused meta-forall"
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(*
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* Detect meta-foralls that are unused in "lemma" statements,
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* and warn the user about them.
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*
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* They can sometimes create weird issues, usually due to the
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* fact that they have the empty sort "'a::{}", which confuses
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* certain tools, such as "atomize".
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*)
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ML \<open>
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(* Return a list of meta-forall variable names that appear
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* to be unused in the input term. *)
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fun find_unused_metaall (Const (@{const_name "Pure.all"}, _) $ Abs (n, _, t)) =
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(if not (Term.is_dependent t) then [n] else []) @ find_unused_metaall t
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| find_unused_metaall (Abs (_, _, t)) =
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find_unused_metaall t
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| find_unused_metaall (a $ b) =
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find_unused_metaall a @ find_unused_metaall b
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| find_unused_metaall _ = []
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(* Given a proof state, analyse its assumptions for unused
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* meta-foralls. *)
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fun detect_unused_meta_forall _ (state : Proof.state) =
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let
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(* Fetch all assumptions and the main goal, and analyse them. *)
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val {context = lthy, goal = goal, ...} = Proof.goal state
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val checked_terms =
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[Thm.concl_of goal] @ map Thm.term_of (Assumption.all_assms_of lthy)
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val results = List.concat (map find_unused_metaall checked_terms)
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(* Produce a message. *)
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fun message results =
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Pretty.paragraph [
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Pretty.str "Unused meta-forall(s): ",
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Pretty.commas
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(map (fn b => Pretty.mark_str (Markup.bound, b)) results)
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|> Pretty.paragraph,
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Pretty.str "."
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]
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(* We use a warning instead of the standard mechanisms so that
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* we can produce a "warning" icon in Isabelle/jEdit. *)
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val _ =
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if length results > 0 then
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warning (message results |> Pretty.string_of)
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else ()
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in
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(false, ("", []))
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end
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(* Setup the tool, stealing the "auto_solve_direct" option. *)
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val _ = Try.tool_setup ("unused_meta_forall",
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(1, @{system_option auto_solve_direct}, detect_unused_meta_forall))
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\<close>
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lemma test_unused_meta_forall: "\<And>x. y \<or> \<not> y"
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oops
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end
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