1 files changed, 0 insertions, 125 deletions
diff --git a/spartan/lib/focus.ML b/spartan/lib/focus.ML
deleted file mode 100644
index 1d8de78..0000000
--- a/spartan/lib/focus.ML
+++ /dev/null
@@ -1,125 +0,0 @@
-(*  Title:      focus.ML
-    Author:     Makarius Wenzel, Joshua Chen
-
-A modified version of the Isar `subgoal` command
-that keeps schematic variables in the goal state.
-
-Modified from code originally written by Makarius Wenzel.
-*)
-
-local
-
-fun param_bindings ctxt (param_suffix, raw_param_specs) st =
-  let
-    val _ = if Thm.no_prems st then error "No subgoals!" else ()
-    val subgoal = #1 (Logic.dest_implies (Thm.prop_of st))
-    val subgoal_params =
-      map (apfst (Name.internal o Name.clean)) (Term.strip_all_vars subgoal)
-      |> Term.variant_frees subgoal |> map #1
-
-    val n = length subgoal_params
-    val m = length raw_param_specs
-    val _ =
-      m <= n orelse
-        error ("Excessive subgoal parameter specification" ^
-          Position.here_list (map snd (drop n raw_param_specs)))
-
-    val param_specs =
-      raw_param_specs |> map
-        (fn (NONE, _) => NONE
-          | (SOME x, pos) =>
-              let
-                val b = #1 (#1 (Proof_Context.cert_var (Binding.make (x, pos), NONE, NoSyn) ctxt))
-                val _ = Variable.check_name b
-              in SOME b end)
-      |> param_suffix ? append (replicate (n - m) NONE)
-
-    fun bindings (SOME x :: xs) (_ :: ys) = x :: bindings xs ys
-      | bindings (NONE :: xs) (y :: ys) = Binding.name y :: bindings xs ys
-      | bindings _ ys = map Binding.name ys
-  in bindings param_specs subgoal_params end
-
-fun gen_schematic_subgoal prep_atts raw_result_binding raw_prems_binding param_specs state =
-  let
-    val _ = Proof.assert_backward state
-
-    val state1 = state
-      |> Proof.map_context (Proof_Context.set_mode Proof_Context.mode_schematic)
-      |> Proof.refine_insert []
-
-    val {context = ctxt, facts = facts, goal = st} = Proof.raw_goal state1
-
-    val result_binding = apsnd (map (prep_atts ctxt)) raw_result_binding
-    val (prems_binding, do_prems) =
-      (case raw_prems_binding of
-        SOME (b, raw_atts) => ((b, map (prep_atts ctxt) raw_atts), true)
-      | NONE => (Binding.empty_atts, false))
-
-    val (subgoal_focus, _) =
-      (if do_prems then Subgoal.focus_prems else Subgoal.focus_params) ctxt
-        1 (SOME (param_bindings ctxt param_specs st)) st
-
-    fun after_qed (ctxt'', [[result]]) =
-      Proof.end_block #> (fn state' =>
-        let
-          val ctxt' = Proof.context_of state'
-          val results' =
-            Proof_Context.export ctxt'' ctxt' (Conjunction.elim_conjunctions result)
-        in
-          state'
-          |> Proof.refine_primitive (fn _ => fn _ =>
-            Subgoal.retrofit ctxt'' ctxt' (#params subgoal_focus) (#asms subgoal_focus) 1
-              (Goal.protect 0 result) st
-            |> Seq.hd)
-          |> Proof.map_context
-            (#2 o Proof_Context.note_thmss "" [(result_binding, [(results', [])])])
-        end)
-      #> Proof.reset_facts
-      #> Proof.enter_backward
-  in
-    state1
-    |> Proof.enter_forward
-    |> Proof.using_facts []
-    |> Proof.begin_block
-    |> Proof.map_context (fn _ =>
-      #context subgoal_focus
-      |> Proof_Context.note_thmss "" [(prems_binding, [(#prems subgoal_focus, [])])] |> #2)
-    |> Proof.internal_goal (K (K ())) (Proof_Context.get_mode ctxt) true "subgoal"
-        NONE after_qed [] [] [(Binding.empty_atts, [(Thm.term_of (#concl subgoal_focus), [])])] |> #2
-    |> Proof.using_facts facts
-    |> pair subgoal_focus
-  end
-
-val opt_fact_binding =
-  Scan.optional (Parse.binding -- Parse.opt_attribs || Parse.attribs >> pair Binding.empty)
-    Binding.empty_atts
-
-val for_params =
-  Scan.optional
-    (\<^keyword>\<open>vars\<close> |--
-      Parse.!!! ((Scan.option Parse.dots >> is_some) --
-        (Scan.repeat1 (Parse.maybe_position Parse.name_position))))
-    (false, [])
-
-val schematic_subgoal_cmd = gen_schematic_subgoal Attrib.attribute_cmd
-
-val parser =
-  opt_fact_binding
-  -- (Scan.option (\<^keyword>\<open>prems\<close> |-- Parse.!!! opt_fact_binding))
-  -- for_params >> (fn ((a, b), c) =>
-    Toplevel.proofs (Seq.make_results o Seq.single o #2 o schematic_subgoal_cmd a b c))
-
-in
-
-(** Outer syntax commands **)
-
-val _ = Outer_Syntax.command \<^command_keyword>\<open>focus\<close>
-  "focus on first subgoal within backward refinement, without instantiating schematic vars"
-  parser
-
-val _ = Outer_Syntax.command \<^command_keyword>\<open>\<guillemotright>\<close> "focus bullet" parser
-val _ = Outer_Syntax.command \<^command_keyword>\<open>\<^item>\<close> "focus bullet" parser
-val _ = Outer_Syntax.command \<^command_keyword>\<open>\<^enum>\<close> "focus bullet" parser
-val _ = Outer_Syntax.command \<^command_keyword>\<open>~\<close> "focus bullet" parser
-
-end