src/Pure/Isar/method.ML
author wenzelm
Tue Aug 01 00:20:12 2000 +0200 (2000-08-01)
changeset 9484 3bda55143260
parent 9418 96973ec6fda4
child 9485 e56577a63005
permissions -rw-r--r--
(un)fold: CHANGED;
added atomize_tac;
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(*  Title:      Pure/Isar/method.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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    License:    GPL (GNU GENERAL PUBLIC LICENSE)
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Proof methods.
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*)
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signature BASIC_METHOD =
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sig
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  val print_methods: theory -> unit
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  val Method: bstring -> (Args.src -> Proof.context -> Proof.method) -> string -> unit
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end;
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signature METHOD =
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sig
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  include BASIC_METHOD
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  val print_global_rules: theory -> unit
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  val print_local_rules: Proof.context -> unit
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  val dest_global: theory attribute
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  val elim_global: theory attribute
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  val intro_global: theory attribute
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  val delrule_global: theory attribute
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  val dest_local: Proof.context attribute
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  val elim_local: Proof.context attribute
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  val intro_local: Proof.context attribute
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  val delrule_local: Proof.context attribute
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  val METHOD: (thm list -> tactic) -> Proof.method
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  val METHOD_CASES:
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    (thm list -> thm -> (thm * (string * RuleCases.T) list) Seq.seq) -> Proof.method
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  val METHOD0: tactic -> Proof.method
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  val fail: Proof.method
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  val succeed: Proof.method
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  val defer: int option -> Proof.method
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  val prefer: int -> Proof.method
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  val insert_tac: thm list -> int -> tactic
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  val insert: thm list -> Proof.method
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  val insert_facts: Proof.method
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  val unfold: thm list -> Proof.method
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  val fold: thm list -> Proof.method
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  val atomize_tac: thm list -> int -> tactic
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  val multi_resolve: thm list -> thm -> thm Seq.seq
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  val multi_resolves: thm list -> thm list -> thm Seq.seq
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  val resolveq_tac: thm Seq.seq -> int -> tactic
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  val resolveq_cases_tac: bool -> (thm * string list) Seq.seq
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    -> int -> thm -> (thm * (string * RuleCases.T) list) Seq.seq
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  val rule_tac: thm list -> thm list -> int -> tactic
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  val rule: thm list -> Proof.method
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  val erule: thm list -> Proof.method
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  val drule: thm list -> Proof.method
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  val frule: thm list -> Proof.method
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  val this: Proof.method
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  val assumption: Proof.context -> Proof.method
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  val set_tactic: (Proof.context -> thm list -> tactic) -> unit
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  val tactic: string -> Proof.context -> Proof.method
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  exception METHOD_FAIL of (string * Position.T) * exn
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  val method: theory -> Args.src -> Proof.context -> Proof.method
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  val add_method: bstring * (Args.src -> Proof.context -> Proof.method) * string -> theory -> theory
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  val add_methods: (bstring * (Args.src -> Proof.context -> Proof.method) * string) list
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    -> theory -> theory
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  val syntax: (Proof.context * Args.T list -> 'a * (Proof.context * Args.T list)) ->
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    Args.src -> Proof.context -> Proof.context * 'a
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  val simple_args: (Args.T list -> 'a * Args.T list)
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    -> ('a -> Proof.context -> Proof.method) -> Args.src -> Proof.context -> Proof.method
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  val ctxt_args: (Proof.context -> Proof.method) -> Args.src -> Proof.context -> Proof.method
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  val no_args: Proof.method -> Args.src -> Proof.context -> Proof.method
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  type modifier
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  val sectioned_args: (Proof.context * Args.T list -> 'a * (Proof.context * Args.T list)) ->
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    (Args.T list -> modifier * Args.T list) list ->
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    ('a -> Proof.context -> Proof.method) -> Args.src -> Proof.context -> Proof.method
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  val bang_sectioned_args:
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    (Args.T list -> modifier * Args.T list) list ->
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    (thm list -> Proof.context -> Proof.method) -> Args.src -> Proof.context -> Proof.method
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  val only_sectioned_args:
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    (Args.T list -> modifier * Args.T list) list ->
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    (Proof.context -> Proof.method) -> Args.src -> Proof.context -> Proof.method
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  val thms_ctxt_args: (thm list -> Proof.context -> Proof.method)
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    -> Args.src -> Proof.context -> Proof.method
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  val thms_args: (thm list -> Proof.method) -> Args.src -> Proof.context -> Proof.method
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  datatype text =
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    Basic of (Proof.context -> Proof.method) |
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    Source of Args.src |
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    Then of text list |
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    Orelse of text list |
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    Try of text |
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    Repeat1 of text
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  val refine: text -> Proof.state -> Proof.state Seq.seq
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  val refine_end: text -> Proof.state -> Proof.state Seq.seq
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  val proof: text option -> Proof.state -> Proof.state Seq.seq
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  val local_qed: bool -> text option
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    -> ({kind: string, name: string, thm: thm} -> unit) * (thm -> unit)
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    -> Proof.state -> Proof.state Seq.seq
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  val local_terminal_proof: text * text option
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    -> ({kind: string, name: string, thm: thm} -> unit) * (thm -> unit)
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    -> Proof.state -> Proof.state Seq.seq
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  val local_default_proof: ({kind: string, name: string, thm: thm} -> unit) * (thm -> unit)
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    -> Proof.state -> Proof.state Seq.seq
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  val local_immediate_proof: ({kind: string, name: string, thm: thm} -> unit) * (thm -> unit)
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    -> Proof.state -> Proof.state Seq.seq
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  val local_done_proof: ({kind: string, name: string, thm: thm} -> unit) * (thm -> unit)
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    -> Proof.state -> Proof.state Seq.seq
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  val global_qed: bool -> text option
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    -> Proof.state -> theory * {kind: string, name: string, thm: thm}
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  val global_terminal_proof: text * text option
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    -> Proof.state -> theory * {kind: string, name: string, thm: thm}
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  val global_default_proof: Proof.state -> theory * {kind: string, name: string, thm: thm}
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  val global_immediate_proof: Proof.state -> theory * {kind: string, name: string, thm: thm}
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  val global_done_proof: Proof.state -> theory * {kind: string, name: string, thm: thm}
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  val setup: (theory -> theory) list
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end;
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structure Method: METHOD =
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struct
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(** global and local rule data **)
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fun prt_rules kind ths =
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  Pretty.writeln (Pretty.big_list ("standard " ^ kind ^ " rules:") (map Display.pretty_thm ths));
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fun print_rules (intro, elim) =
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  (prt_rules "introduction" intro; prt_rules "elimination" elim);
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(* theory data kind 'Isar/rules' *)
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structure GlobalRulesArgs =
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struct
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  val name = "Isar/rules";
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  type T = thm list * thm list;
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  val empty = ([], []);
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  val copy = I;
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  val prep_ext = I;
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  fun merge ((intro1, elim1), (intro2, elim2)) =
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    (Drule.merge_rules (intro1, intro2), Drule.merge_rules (elim1, elim2));
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  fun print _ = print_rules;
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end;
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structure GlobalRules = TheoryDataFun(GlobalRulesArgs);
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val print_global_rules = GlobalRules.print;
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(* proof data kind 'Isar/rules' *)
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structure LocalRulesArgs =
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struct
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  val name = "Isar/rules";
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  type T = thm list * thm list;
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  val init = GlobalRules.get;
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  fun print _ = print_rules;
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end;
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structure LocalRules = ProofDataFun(LocalRulesArgs);
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val print_local_rules = LocalRules.print;
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(** attributes **)
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(* add rules *)
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local
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fun add_rule thm rules = Library.gen_ins Thm.eq_thm (thm, rules);
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fun del_rule thm rules = Library.gen_rem Thm.eq_thm (rules, thm);
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fun add_dest thm (intro, elim) = (intro, add_rule (Tactic.make_elim thm) elim);
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fun add_elim thm (intro, elim) = (intro, add_rule thm elim);
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fun add_intro thm (intro, elim) = (add_rule thm intro, elim);
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fun delrule thm (intro, elim) = (del_rule thm intro, del_rule thm elim);
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fun mk_att f g (x, thm) = (f (g thm) x, thm);
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in
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val dest_global = mk_att GlobalRules.map add_dest;
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val elim_global = mk_att GlobalRules.map add_elim;
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val intro_global = mk_att GlobalRules.map add_intro;
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val delrule_global = mk_att GlobalRules.map delrule;
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val dest_local = mk_att LocalRules.map add_dest;
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val elim_local = mk_att LocalRules.map add_elim;
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val intro_local = mk_att LocalRules.map add_intro;
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val delrule_local = mk_att LocalRules.map delrule;
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end;
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(* concrete syntax *)
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val rule_atts =
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 [("dest", (Attrib.no_args dest_global, Attrib.no_args dest_local), "declare destruction rule"),
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  ("elim", (Attrib.no_args elim_global, Attrib.no_args elim_local), "declare elimination rule"),
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  ("intro", (Attrib.no_args intro_global, Attrib.no_args intro_local), "declare introduction rule"),
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  ("delrule", (Attrib.no_args delrule_global, Attrib.no_args delrule_local), "undeclare rule")];
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(** proof methods **)
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(* make methods *)
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val METHOD = Proof.method;
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val METHOD_CASES = Proof.method_cases;
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fun METHOD0 tac = METHOD (fn [] => tac | _ => error "Cannot handle current facts");
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(* primitive *)
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val fail = METHOD (K no_tac);
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val succeed = METHOD (K all_tac);
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(* shuffle *)
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fun prefer i = METHOD (K (Tactic.defer_tac i THEN PRIMITIVE (Thm.permute_prems 0 ~1)));
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fun defer opt_i = METHOD (K (Tactic.defer_tac (if_none opt_i 1)));
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(* insert *)
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local
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fun cut_rule_tac raw_rule =
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  let
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    val rule = Drule.forall_intr_vars raw_rule;
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    val revcut_rl = Drule.incr_indexes_wrt [] [] [] [rule] Drule.revcut_rl;
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  in Tactic.rtac (rule COMP revcut_rl) end;
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in
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fun insert_tac [] i = all_tac
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  | insert_tac facts i = EVERY (map (fn th => cut_rule_tac th i) facts);
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val insert_facts = METHOD (ALLGOALS o insert_tac);
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fun insert thms = METHOD (fn _ => ALLGOALS (insert_tac thms));
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end;
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(* unfold / fold definitions *)
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fun unfold thms = METHOD (fn facts =>
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  ALLGOALS (insert_tac facts) THEN CHANGED (rewrite_goals_tac thms));
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fun fold thms = METHOD (fn facts =>
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  ALLGOALS (insert_tac facts) THEN CHANGED (fold_goals_tac thms));
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(* atomize meta-connectives *)
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fun atomize_tac rews i st =
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  if Logic.has_meta_prems (#prop (Thm.rep_thm st)) i then
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    (warning "FIXME: atomize_tac";
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    Tactic.asm_rewrite_goal_tac (true, false, false) (K no_tac) (Thm.mss_of rews) i st)
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  else all_tac st;
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(* multi_resolve *)
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local
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fun res th i rule =
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  Thm.biresolution false [(false, th)] i rule handle THM _ => Seq.empty;
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fun multi_res _ [] rule = Seq.single rule
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  | multi_res i (th :: ths) rule = Seq.flat (Seq.map (res th i) (multi_res (i + 1) ths rule));
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in
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val multi_resolve = multi_res 1;
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fun multi_resolves facts rules = Seq.flat (Seq.map (multi_resolve facts) (Seq.of_list rules));
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end;
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(* general rule *)
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fun gen_resolveq_tac tac rules i st =
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  Seq.flat (Seq.map (fn rule => tac rule i st) rules);
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val resolveq_tac = gen_resolveq_tac Tactic.rtac;
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fun resolveq_cases_tac opaq = gen_resolveq_tac (fn (rule, cases) => fn i => fn st =>
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  Seq.map (rpair (RuleCases.make opaq rule cases)) (Tactic.rtac rule i st));
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(* simple rule *)
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local
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fun gen_rule_tac tac rules [] = tac rules
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  | gen_rule_tac tac erules facts = gen_resolveq_tac (tac o single) (multi_resolves facts erules);
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fun gen_rule tac rules = METHOD (HEADGOAL o tac rules);
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fun gen_rule' tac arg_rules ctxt = METHOD (fn facts =>
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  let val rules =
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    if not (null arg_rules) then arg_rules
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    else if null facts then #1 (LocalRules.get ctxt)
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    else op @ (LocalRules.get ctxt);
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  in HEADGOAL (tac rules facts) end);
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fun setup raw_tac =
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  let val tac = gen_rule_tac raw_tac
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  in (tac, gen_rule tac, gen_rule' tac) end;
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in
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val (rule_tac, rule, some_rule) = setup Tactic.resolve_tac;
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val (erule_tac, erule, some_erule) = setup Tactic.eresolve_tac;
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val (drule_tac, drule, some_drule) = setup Tactic.dresolve_tac;
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val (frule_tac, frule, some_frule) = setup Tactic.forward_tac;
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end;
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(* this *)
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val this = METHOD (EVERY o map (HEADGOAL o Tactic.rtac));
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(* assumption *)
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fun assm_tac ctxt =
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  assume_tac APPEND' resolve_tac (filter Thm.no_prems (ProofContext.prems_of ctxt));
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fun assumption_tac ctxt [] = assm_tac ctxt
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  | assumption_tac _ [fact] = resolve_tac [fact]
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  | assumption_tac _ _ = K no_tac;
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fun assumption ctxt = METHOD (HEADGOAL o assumption_tac ctxt);
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(* res_inst_tac emulations *)
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(*Note: insts refer to the implicit (!) goal context; use at your own risk*)
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   341
fun gen_res_inst tac (quant, (insts, thm)) =
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   342
  METHOD (fn facts => (quant (insert_tac facts THEN' tac insts thm)));
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   343
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   344
val res_inst = gen_res_inst Tactic.res_inst_tac;
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   345
val eres_inst = gen_res_inst Tactic.eres_inst_tac;
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   346
val dres_inst = gen_res_inst Tactic.dres_inst_tac;
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   347
val forw_inst = gen_res_inst Tactic.forw_inst_tac;
wenzelm@8238
   348
wenzelm@8238
   349
wenzelm@8329
   350
(* simple Prolog interpreter *)
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   351
wenzelm@8329
   352
fun prolog_tac rules facts =
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   353
  DEPTH_SOLVE_1 (HEADGOAL (Tactic.assume_tac APPEND' Tactic.resolve_tac (facts @ rules)));
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   354
wenzelm@8329
   355
val prolog = METHOD o prolog_tac;
wenzelm@8329
   356
wenzelm@8329
   357
wenzelm@8351
   358
(* ML tactics *)
wenzelm@8351
   359
wenzelm@8351
   360
val tactic_ref = ref ((fn _ => raise Match): Proof.context -> thm list -> tactic);
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   361
fun set_tactic f = tactic_ref := f;
wenzelm@8351
   362
wenzelm@8351
   363
fun tactic txt ctxt = METHOD (fn facts =>
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   364
 (Context.use_mltext
wenzelm@8671
   365
   ("let fun tactic (ctxt: PureIsar.Proof.context) (facts: thm list) : tactic = \
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   366
    \let val thm = PureIsar.ProofContext.get_thm ctxt and thms = PureIsar.ProofContext.get_thms ctxt in\n"
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   367
    ^ txt ^
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   368
    "\nend in PureIsar.Method.set_tactic tactic end")
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   369
  false (Some (ProofContext.theory_of ctxt)); ! tactic_ref ctxt facts));
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   370
wenzelm@8351
   371
wenzelm@5824
   372
wenzelm@5824
   373
(** methods theory data **)
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   374
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   375
(* data kind 'Isar/methods' *)
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   376
wenzelm@5824
   377
structure MethodsDataArgs =
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   378
struct
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   379
  val name = "Isar/methods";
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   380
  type T =
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   381
    {space: NameSpace.T,
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   382
     meths: (((Args.src -> Proof.context -> Proof.method) * string) * stamp) Symtab.table};
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   383
wenzelm@5824
   384
  val empty = {space = NameSpace.empty, meths = Symtab.empty};
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   385
  val copy = I;
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   386
  val prep_ext = I;
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   387
  fun merge ({space = space1, meths = meths1}, {space = space2, meths = meths2}) =
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   388
    {space = NameSpace.merge (space1, space2),
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   389
      meths = Symtab.merge eq_snd (meths1, meths2) handle Symtab.DUPS dups =>
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   390
        error ("Attempt to merge different versions of methods " ^ commas_quote dups)};
wenzelm@5824
   391
wenzelm@9222
   392
  fun print _ {space, meths} =
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   393
    let
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   394
      fun prt_meth (name, ((_, comment), _)) = Pretty.block
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   395
        [Pretty.str (name ^ ":"), Pretty.brk 2, Pretty.str comment];
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   396
    in
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   397
      [Pretty.big_list "methods:" (map prt_meth (NameSpace.cond_extern_table space meths))]
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   398
      |> Pretty.chunks |> Pretty.writeln
wenzelm@5824
   399
    end;
wenzelm@5824
   400
end;
wenzelm@5824
   401
wenzelm@5824
   402
structure MethodsData = TheoryDataFun(MethodsDataArgs);
wenzelm@5824
   403
val print_methods = MethodsData.print;
wenzelm@7611
   404
wenzelm@5824
   405
wenzelm@5824
   406
(* get methods *)
wenzelm@5824
   407
wenzelm@5916
   408
exception METHOD_FAIL of (string * Position.T) * exn;
wenzelm@5916
   409
wenzelm@5824
   410
fun method thy =
wenzelm@5824
   411
  let
wenzelm@5824
   412
    val {space, meths} = MethodsData.get thy;
wenzelm@5824
   413
wenzelm@5884
   414
    fun meth src =
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   415
      let
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   416
        val ((raw_name, _), pos) = Args.dest_src src;
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   417
        val name = NameSpace.intern space raw_name;
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   418
      in
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   419
        (case Symtab.lookup (meths, name) of
wenzelm@5824
   420
          None => error ("Unknown proof method: " ^ quote name ^ Position.str_of pos)
wenzelm@5916
   421
        | Some ((mth, _), _) => transform_failure (curry METHOD_FAIL (name, pos)) (mth src))
wenzelm@5824
   422
      end;
wenzelm@5824
   423
  in meth end;
wenzelm@5824
   424
wenzelm@5824
   425
wenzelm@9194
   426
(* add_method(s) *)
wenzelm@5824
   427
wenzelm@5824
   428
fun add_methods raw_meths thy =
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   429
  let
wenzelm@5824
   430
    val full = Sign.full_name (Theory.sign_of thy);
wenzelm@5824
   431
    val new_meths =
wenzelm@5824
   432
      map (fn (name, f, comment) => (full name, ((f, comment), stamp ()))) raw_meths;
wenzelm@5824
   433
wenzelm@5824
   434
    val {space, meths} = MethodsData.get thy;
wenzelm@5824
   435
    val space' = NameSpace.extend (space, map fst new_meths);
wenzelm@5824
   436
    val meths' = Symtab.extend (meths, new_meths) handle Symtab.DUPS dups =>
wenzelm@5824
   437
      error ("Duplicate declaration of method(s) " ^ commas_quote dups);
wenzelm@5824
   438
  in
wenzelm@5824
   439
    thy |> MethodsData.put {space = space', meths = meths'}
wenzelm@5824
   440
  end;
wenzelm@5824
   441
wenzelm@9194
   442
val add_method = add_methods o Library.single;
wenzelm@9194
   443
wenzelm@5824
   444
(*implicit version*)
wenzelm@5824
   445
fun Method name meth cmt = Context.>> (add_methods [(name, meth, cmt)]);
wenzelm@5824
   446
wenzelm@5824
   447
wenzelm@5884
   448
wenzelm@5884
   449
(** method syntax **)
wenzelm@5824
   450
wenzelm@5884
   451
(* basic *)
wenzelm@5884
   452
wenzelm@5884
   453
fun syntax (scan: (Proof.context * Args.T list -> 'a * (Proof.context * Args.T list))) =
wenzelm@5884
   454
  Args.syntax "method" scan;
wenzelm@5824
   455
wenzelm@8351
   456
fun simple_args scan f src ctxt : Proof.method =
wenzelm@8351
   457
  #2 (syntax (Scan.lift (scan >> (fn x => f x ctxt))) src ctxt);
wenzelm@8351
   458
wenzelm@7555
   459
fun ctxt_args (f: Proof.context -> Proof.method) src ctxt =
wenzelm@8282
   460
  #2 (syntax (Scan.succeed (f ctxt)) src ctxt);
wenzelm@7555
   461
wenzelm@7555
   462
fun no_args m = ctxt_args (K m);
wenzelm@5884
   463
wenzelm@5884
   464
wenzelm@8351
   465
wenzelm@5884
   466
(* sections *)
wenzelm@5824
   467
wenzelm@7268
   468
type modifier = (Proof.context -> Proof.context) * Proof.context attribute;
wenzelm@7268
   469
wenzelm@7268
   470
local
wenzelm@7268
   471
wenzelm@8381
   472
fun sect ss = Scan.first (map Scan.lift ss);
wenzelm@5884
   473
fun thms ss = Scan.unless (sect ss) Attrib.local_thms;
wenzelm@5884
   474
fun thmss ss = Scan.repeat (thms ss) >> flat;
wenzelm@5884
   475
wenzelm@7268
   476
fun apply (f, att) (ctxt, ths) = Thm.applys_attributes ((f ctxt, ths), [att]);
wenzelm@5824
   477
wenzelm@7268
   478
fun section ss = (sect ss -- thmss ss) :-- (fn (m, ths) => Scan.depend (fn ctxt =>
wenzelm@7268
   479
  Scan.succeed (apply m (ctxt, ths)))) >> #2;
wenzelm@5884
   480
wenzelm@7601
   481
fun sectioned args ss = args -- Scan.repeat (section ss);
wenzelm@5884
   482
wenzelm@7268
   483
in
wenzelm@5824
   484
wenzelm@5884
   485
fun sectioned_args args ss f src ctxt =
wenzelm@8282
   486
  let val (ctxt', (x, _)) = syntax (sectioned args ss) src ctxt
wenzelm@5921
   487
  in f x ctxt' end;
wenzelm@5884
   488
wenzelm@7601
   489
fun bang_sectioned_args ss f = sectioned_args Args.bang_facts ss f;
wenzelm@7601
   490
fun only_sectioned_args ss f = sectioned_args (Scan.succeed ()) ss (fn () => f);
wenzelm@7268
   491
wenzelm@8093
   492
fun thms_ctxt_args f = sectioned_args (thmss []) [] f;
wenzelm@8093
   493
fun thms_args f = thms_ctxt_args (K o f);
wenzelm@5824
   494
wenzelm@7268
   495
end;
wenzelm@7268
   496
wenzelm@5824
   497
wenzelm@8238
   498
(* insts *)
wenzelm@8238
   499
wenzelm@8238
   500
val insts =
wenzelm@8537
   501
  Args.enum1 "and" (Scan.lift (Args.name -- Args.!!! (Args.$$$ "=" |-- Args.name))) --
wenzelm@8238
   502
    (Scan.lift (Args.$$$ "in") |-- Attrib.local_thm);
wenzelm@8238
   503
wenzelm@8537
   504
fun inst_args f = f oo (#2 oo syntax (Args.goal_spec HEADGOAL -- insts));
wenzelm@8537
   505
wenzelm@8537
   506
wenzelm@8537
   507
(* subgoal *)
wenzelm@8537
   508
wenzelm@8537
   509
fun subgoal x = (Args.goal_spec HEADGOAL -- Scan.lift Args.name >>
wenzelm@8537
   510
  (fn (quant, s) => METHOD (fn facts => quant (insert_tac facts THEN' Tactic.subgoal_tac s)))) x;
wenzelm@8537
   511
wenzelm@8537
   512
val subgoal_meth = #2 oo syntax subgoal;
wenzelm@8238
   513
wenzelm@8238
   514
wenzelm@5824
   515
wenzelm@5824
   516
(** method text **)
wenzelm@5824
   517
wenzelm@5824
   518
(* datatype text *)
wenzelm@5824
   519
wenzelm@5824
   520
datatype text =
wenzelm@5824
   521
  Basic of (Proof.context -> Proof.method) |
wenzelm@5824
   522
  Source of Args.src |
wenzelm@5824
   523
  Then of text list |
wenzelm@5824
   524
  Orelse of text list |
wenzelm@5824
   525
  Try of text |
wenzelm@5824
   526
  Repeat1 of text;
wenzelm@5824
   527
wenzelm@5824
   528
wenzelm@5824
   529
(* refine *)
wenzelm@5824
   530
wenzelm@8238
   531
fun gen_refine f text state =
wenzelm@5824
   532
  let
wenzelm@5824
   533
    val thy = Proof.theory_of state;
wenzelm@5824
   534
wenzelm@8238
   535
    fun eval (Basic mth) = f mth
wenzelm@8238
   536
      | eval (Source src) = f (method thy src)
wenzelm@5824
   537
      | eval (Then txts) = Seq.EVERY (map eval txts)
wenzelm@5824
   538
      | eval (Orelse txts) = Seq.FIRST (map eval txts)
wenzelm@5824
   539
      | eval (Try txt) = Seq.TRY (eval txt)
wenzelm@5824
   540
      | eval (Repeat1 txt) = Seq.REPEAT1 (eval txt);
wenzelm@5824
   541
  in eval text state end;
wenzelm@5824
   542
wenzelm@8238
   543
val refine = gen_refine Proof.refine;
wenzelm@8238
   544
val refine_end = gen_refine Proof.refine_end;
wenzelm@6404
   545
wenzelm@5824
   546
wenzelm@6404
   547
(* structured proof steps *)
wenzelm@5824
   548
wenzelm@7506
   549
val default_text = Source (Args.src (("default", []), Position.none));
wenzelm@8195
   550
val this_text = Basic (K this);
wenzelm@8966
   551
val done_text = Basic (K (METHOD0 all_tac));
wenzelm@7555
   552
wenzelm@8966
   553
fun close_text asm = Basic (fn ctxt => METHOD (K
wenzelm@8966
   554
  (FILTER Thm.no_prems ((if asm then ALLGOALS (assm_tac ctxt) else all_tac) THEN flexflex_tac))));
wenzelm@8966
   555
wenzelm@8966
   556
fun finish_text asm None = close_text asm
wenzelm@8966
   557
  | finish_text asm (Some txt) = Then [txt, close_text asm];
wenzelm@6872
   558
wenzelm@5824
   559
fun proof opt_text state =
wenzelm@5824
   560
  state
wenzelm@5824
   561
  |> Proof.assert_backward
wenzelm@6404
   562
  |> refine (if_none opt_text default_text)
wenzelm@8242
   563
  |> Seq.map (Proof.goal_facts (K []))
wenzelm@5824
   564
  |> Seq.map Proof.enter_forward;
wenzelm@5824
   565
wenzelm@8966
   566
fun local_qed asm opt_text = Proof.local_qed (refine (finish_text asm opt_text));
wenzelm@8966
   567
fun local_terminal_proof (text, opt_text) pr =
wenzelm@8966
   568
  Seq.THEN (proof (Some text), local_qed true opt_text pr);
wenzelm@8966
   569
val local_default_proof = local_terminal_proof (default_text, None);
wenzelm@8195
   570
val local_immediate_proof = local_terminal_proof (this_text, None);
wenzelm@8966
   571
fun local_done_proof pr = Seq.THEN (proof (Some done_text), local_qed false None pr);
wenzelm@5824
   572
wenzelm@6872
   573
wenzelm@8966
   574
fun global_qeds asm opt_text = Proof.global_qed (refine (finish_text asm opt_text));
wenzelm@5824
   575
wenzelm@8966
   576
fun global_qed asm opt_text state =
wenzelm@6872
   577
  state
wenzelm@8966
   578
  |> global_qeds asm opt_text
wenzelm@6872
   579
  |> Proof.check_result "Failed to finish proof" state
wenzelm@6872
   580
  |> Seq.hd;
wenzelm@6872
   581
wenzelm@8966
   582
fun global_term_proof asm (text, opt_text) state =
wenzelm@6872
   583
  state
wenzelm@6872
   584
  |> proof (Some text)
wenzelm@6872
   585
  |> Proof.check_result "Terminal proof method failed" state
wenzelm@8966
   586
  |> (Seq.flat o Seq.map (global_qeds asm opt_text))
wenzelm@6872
   587
  |> Proof.check_result "Failed to finish proof (after successful terminal method)" state
wenzelm@6872
   588
  |> Seq.hd;
wenzelm@6872
   589
wenzelm@8966
   590
val global_terminal_proof = global_term_proof true;
wenzelm@6934
   591
val global_default_proof = global_terminal_proof (default_text, None);
wenzelm@8966
   592
val global_immediate_proof = global_terminal_proof (this_text, None);
wenzelm@8966
   593
val global_done_proof = global_term_proof false (done_text, None);
wenzelm@5824
   594
wenzelm@5824
   595
wenzelm@5824
   596
(** theory setup **)
wenzelm@5824
   597
wenzelm@5824
   598
(* pure_methods *)
wenzelm@5824
   599
wenzelm@5824
   600
val pure_methods =
wenzelm@5824
   601
 [("fail", no_args fail, "force failure"),
wenzelm@5824
   602
  ("succeed", no_args succeed, "succeed"),
wenzelm@7574
   603
  ("-", no_args insert_facts, "do nothing, inserting current facts only"),
wenzelm@7664
   604
  ("insert", thms_args insert, "insert theorems, ignoring facts (improper!)"),
wenzelm@7601
   605
  ("unfold", thms_args unfold, "unfold definitions"),
wenzelm@7601
   606
  ("fold", thms_args fold, "fold definitions"),
wenzelm@8153
   607
  ("default", thms_ctxt_args some_rule, "apply some rule"),
wenzelm@8153
   608
  ("rule", thms_ctxt_args some_rule, "apply some rule"),
wenzelm@8220
   609
  ("erule", thms_ctxt_args some_erule, "apply some rule in elimination manner (improper!)"),
wenzelm@8220
   610
  ("drule", thms_ctxt_args some_drule, "apply some rule in destruct manner (improper!)"),
wenzelm@8220
   611
  ("frule", thms_ctxt_args some_frule, "apply some rule in forward manner (improper!)"),
wenzelm@8195
   612
  ("this", no_args this, "apply current facts as rules"),
wenzelm@8238
   613
  ("assumption", ctxt_args assumption, "proof by assumption, preferring facts"),
wenzelm@8537
   614
  ("res_inst_tac", inst_args res_inst, "res_inst_tac emulation (dynamic instantiation!)"),
wenzelm@8537
   615
  ("eres_inst_tac", inst_args eres_inst, "eres_inst_tac emulation (dynamic instantiation!)"),
wenzelm@8537
   616
  ("dres_inst_tac", inst_args dres_inst, "dres_inst_tac emulation (dynamic instantiation!)"),
wenzelm@8537
   617
  ("forw_inst_tac", inst_args forw_inst, "forw_inst_tac emulation (dynamic instantiation!)"),
wenzelm@8537
   618
  ("subgoal_tac", subgoal_meth, "subgoal_tac emulation (dynamic instantiation!)"),
wenzelm@8351
   619
  ("prolog", thms_args prolog, "simple prolog interpreter"),
wenzelm@8351
   620
  ("tactic", simple_args Args.name tactic, "ML tactic as proof method")];
wenzelm@5824
   621
wenzelm@5824
   622
wenzelm@5824
   623
(* setup *)
wenzelm@5824
   624
wenzelm@8153
   625
val setup =
wenzelm@8153
   626
 [GlobalRules.init, LocalRules.init, Attrib.add_attributes rule_atts,
wenzelm@8153
   627
  MethodsData.init, add_methods pure_methods];
wenzelm@5824
   628
wenzelm@5824
   629
wenzelm@5824
   630
end;
wenzelm@5824
   631
wenzelm@5824
   632
wenzelm@5824
   633
structure BasicMethod: BASIC_METHOD = Method;
wenzelm@5824
   634
open BasicMethod;