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-(********
-Isabelle/HoTT: Proof methods
-Jan 2019
-
-Set up various proof methods and auxiliary functionality.
-
-********)
-
-theory HoTT_Methods
-imports HoTT_Base "HOL-Eisbach.Eisbach" "HOL-Eisbach.Eisbach_Tools"
-
-begin
-
-
-section \<open>Substitution and simplification\<close>
-
-ML_file "~~/src/Tools/misc_legacy.ML"
-ML_file "~~/src/Tools/IsaPlanner/isand.ML"
-ML_file "~~/src/Tools/IsaPlanner/rw_inst.ML"
-ML_file "~~/src/Tools/IsaPlanner/zipper.ML"
-ML_file "~~/src/Tools/eqsubst.ML"
-\<comment> \<open>Import the @{method subst} method, used for substituting definitional equalities.\<close>
-
-text \<open>
-Method @{theory_text compute} performs single-step simplifications, using any rules declared @{attribute comp} in the context.
-Subgoals arising from a substitution are solved by assumption and standard rules, as well as rules passed using @{theory_text add}.
-
-Note that the solving is sometimes a little eager; for more manual control one should use @{method subst} directly.
-\<close>
-
-method compute uses add declares comp = (subst comp; (rule add | assumption | rule)?)
-
-
-section \<open>Handling universes\<close>
-
-text \<open>
-Methods @{theory_text provelt}, @{theory_text hierarchy}, and @{theory_text cumulativity} prove propositions of the form
-\<^item> \<open>n < (Suc (... (Suc n) ...))\<close>,
-\<^item> \<open>U i: U (Suc (... (Suc i) ...))\<close>, and
-\<^item> @{prop "A: U i \<Longrightarrow> A: U j"}, where @{prop "i \<le> j"},
-respectively.
-\<close>
-
-method provelt = (rule lt_Suc | (rule lt_trans, (rule lt_Suc)+)+)
-
-method hierarchy = (rule U_hierarchy, provelt)
-
-method cumulativity declares form = (
-  ((elim U_cumulative' | (rule U_cumulative', rule form)), rule leq_min) |
-  ((elim U_cumulative | (rule U_cumulative, rule form)), provelt)
-)
-
-
-section \<open>Deriving typing judgments\<close>
-
-method routine uses add = (rule add | assumption | rule)+
-
-text \<open>
-The method @{method routine} proves typing judgments @{prop "a: A"} using the rules declared @{attribute intro} in the respective theory files, as well as any additional lemmas provided with the modifier @{theory_text add}.
-\<close>
-
-
-section \<open>Derivation search\<close>
-
-text \<open>
-The method @{theory_text derive} combines @{method routine} and @{method compute} to search for derivations of judgments.
-It also handles universes using @{method cumulativity}.
-The method @{method hierarchy} has been observed to cause looping in previous versions, and is hence no longer part of @{theory_text derive}.
-\<close>
-
-method derive uses lems unfold declares comp =
-  (unfold unfold | routine add: lems | compute add: lems comp: comp | cumulativity form: lems)+
-
-section \<open>Additional method combinators\<close>
-
-text \<open>
-The ML expression @{ML_text "repeat tac"} below yields a @{ML_type "(Proof.context -> Proof.method) context_parser"}, which may be passed to @{command method_setup} to set up a method that scans for an integer n and executes the tactic returned by @{ML_text tac} n times.
-See the setup of method @{text quantify} in @{file Prod.thy} for an example.
-\<close>
-
-ML \<open>
-fun repeat (tac: Proof.context -> tactic) =
-  let
-    fun cparser_of parser (ctxt, toks) = parser toks ||> (fn toks => (ctxt, toks))
-  in
-    cparser_of Args.text >> (fn n => fn ctxt => fn facts =>
-      SIMPLE_METHOD (REPEAT_DETERM_N (the (Int.fromString n))(tac ctxt)) facts)
-  end
-\<close>
-
-end