src/Pure/Isar/proof.ML
author wenzelm
Sun Nov 04 20:58:01 2001 +0100 (2001-11-04)
changeset 12045 bfaa23b19f47
parent 12015 68b2a53161e6
child 12055 a9c44895cc8c
permissions -rw-r--r--
theorem(_i): locale elements;
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(*  Title:      Pure/Isar/proof.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 states and methods.
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*)
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signature BASIC_PROOF =
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sig
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  val FINDGOAL: (int -> thm -> 'a Seq.seq) -> thm -> 'a Seq.seq
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  val HEADGOAL: (int -> thm -> 'a Seq.seq) -> thm -> 'a Seq.seq
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end;
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signature PROOF =
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sig
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  include BASIC_PROOF
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  type context
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  type state
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  exception STATE of string * state
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  val check_result: string -> state -> 'a Seq.seq -> 'a Seq.seq
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  val init_state: theory -> state
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  val context_of: state -> context
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  val theory_of: state -> theory
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  val sign_of: state -> Sign.sg
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  val warn_extra_tfrees: state -> state -> state
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  val reset_thms: string -> state -> state
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  val the_facts: state -> thm list
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  val the_fact: state -> thm
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  val get_goal: state -> context * (thm list * thm)
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  val goal_facts: (state -> thm list) -> state -> state
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  val use_facts: state -> state
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  val reset_facts: state -> state
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  val is_chain: state -> bool
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  val assert_forward: state -> state
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  val assert_forward_or_chain: state -> state
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  val assert_backward: state -> state
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  val assert_no_chain: state -> state
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  val enter_forward: state -> state
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  val show_hyps: bool ref
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  val pretty_thm: thm -> Pretty.T
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  val pretty_thms: thm list -> Pretty.T
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  val verbose: bool ref
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  val print_state: int -> state -> unit
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  val pretty_goals: bool -> state -> Pretty.T list
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  val level: state -> int
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  type method
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  val method: (thm list -> tactic) -> method
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  val method_cases: (thm list -> thm -> (thm * (string * RuleCases.T) list) Seq.seq) -> method
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  val refine: (context -> method) -> state -> state Seq.seq
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  val refine_end: (context -> method) -> state -> state Seq.seq
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  val match_bind: (string list * string) list -> state -> state
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  val match_bind_i: (term list * term) list -> state -> state
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  val let_bind: (string list * string) list -> state -> state
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  val let_bind_i: (term list * term) list -> state -> state
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  val simple_have_thms: string -> thm list -> state -> state
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  val have_thmss: ((string * context attribute list) *
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    (thm list * context attribute list) list) list -> state -> state
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  val with_thmss: ((string * context attribute list) *
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    (thm list * context attribute list) list) list -> state -> state
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  val fix: (string list * string option) list -> state -> state
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  val fix_i: (string list * typ option) list -> state -> state
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  val assm: ProofContext.exporter
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    -> ((string * context attribute list) * (string * (string list * string list)) list) list
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    -> state -> state
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  val assm_i: ProofContext.exporter
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    -> ((string * context attribute list) * (term * (term list * term list)) list) list
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    -> state -> state
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  val assume:
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    ((string * context attribute list) * (string * (string list * string list)) list) list
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    -> state -> state
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  val assume_i: ((string * context attribute list) * (term * (term list * term list)) list) list
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    -> state -> state
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  val presume:
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    ((string * context attribute list) * (string * (string list * string list)) list) list
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    -> state -> state
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  val presume_i: ((string * context attribute list) * (term * (term list * term list)) list) list
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    -> state -> state
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  val def: string -> context attribute list -> string *  (string * string list) -> state -> state
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  val def_i: string -> context attribute list -> string * (term * term list) -> state -> state
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  val invoke_case: string * string option list * context attribute list -> state -> state
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  val theorem: string -> xstring option -> context attribute Locale.element list -> bstring
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    -> theory attribute list -> string * (string list * string list) -> theory -> state
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  val theorem_i: string -> string option -> context attribute Locale.element_i list -> bstring
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    -> theory attribute list -> term * (term list * term list) -> theory -> state
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  val chain: state -> state
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  val from_facts: thm list -> state -> state
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  val show: (bool -> state -> state) -> (state -> state Seq.seq) -> string
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    -> context attribute list -> string * (string list * string list) -> bool -> state -> state
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  val show_i: (bool -> state -> state) -> (state -> state Seq.seq) -> string
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    -> context attribute list -> term * (term list * term list) -> bool -> state -> state
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  val have: (state -> state Seq.seq) -> string -> context attribute list
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    -> string * (string list * string list) -> state -> state
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  val have_i: (state -> state Seq.seq) -> string -> context attribute list
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    -> term * (term list * term list) -> state -> state
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  val at_bottom: state -> bool
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  val local_qed: (state -> state Seq.seq)
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    -> ({kind: string, name: string, thm: thm} -> unit) * (thm -> unit) -> state -> state Seq.seq
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  val global_qed: (state -> state Seq.seq) -> state
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    -> (theory * {kind: string, name: string, thm: thm}) Seq.seq
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  val begin_block: state -> state
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  val end_block: state -> state Seq.seq
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  val next_block: state -> state
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end;
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signature PRIVATE_PROOF =
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sig
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  include PROOF
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  val put_data: Object.kind -> ('a -> Object.T) -> 'a -> state -> state
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end;
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structure Proof: PRIVATE_PROOF =
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struct
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(** proof state **)
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type context = ProofContext.context;
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(* type goal *)
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datatype kind =
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  Theorem of string * string option * theory attribute list |    (*theorem with kind and locale*)
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  Show of context attribute list |               (*intermediate result, solving subgoal*)
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  Have of context attribute list;                (*intermediate result*)
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fun kind_name _ (Theorem (s, None, _)) = s
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  | kind_name sg (Theorem (s, Some loc, _)) = s ^ " (in " ^ Locale.cond_extern sg loc ^ ")"
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  | kind_name _ (Show _) = "show"
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  | kind_name _ (Have _) = "have";
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type goal =
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 (kind *        (*result kind*)
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  string *      (*result name*)
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  term) *       (*result statement*)
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 (thm list *    (*use facts*)
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  thm);         (*goal: subgoals ==> statement*)
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(* type mode *)
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datatype mode = Forward | ForwardChain | Backward;
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val mode_name = (fn Forward => "state" | ForwardChain => "chain" | Backward => "prove");
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(* datatype state *)
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datatype node =
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  Node of
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   {context: context,
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    facts: thm list option,
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    mode: mode,
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    goal: (goal * (state -> state Seq.seq)) option}
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and state =
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  State of
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    node *              (*current*)
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    node list;          (*parents wrt. block structure*)
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fun make_node (context, facts, mode, goal) =
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  Node {context = context, facts = facts, mode = mode, goal = goal};
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exception STATE of string * state;
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fun err_malformed name state =
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  raise STATE (name ^ ": internal error -- malformed proof state", state);
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fun check_result msg state sq =
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  (case Seq.pull sq of
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    None => raise STATE (msg, state)
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  | Some s_sq => Seq.cons s_sq);
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fun map_current f (State (Node {context, facts, mode, goal}, nodes)) =
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  State (make_node (f (context, facts, mode, goal)), nodes);
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fun init_state thy =
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  State (make_node (ProofContext.init thy, None, Forward, None), []);
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(** basic proof state operations **)
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(* context *)
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fun context_of (State (Node {context, ...}, _)) = context;
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val theory_of = ProofContext.theory_of o context_of;
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val sign_of = ProofContext.sign_of o context_of;
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fun map_context f = map_current (fn (ctxt, facts, mode, goal) => (f ctxt, facts, mode, goal));
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fun map_context_result f (state as State (Node {context, facts, mode, goal}, nodes)) =
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  let val (context', result) = f context
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  in (State (make_node (context', facts, mode, goal), nodes), result) end;
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fun put_data kind f = map_context o ProofContext.put_data kind f;
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val warn_extra_tfrees = map_context o ProofContext.warn_extra_tfrees o context_of;
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val add_binds_i = map_context o ProofContext.add_binds_i;
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val auto_bind_goal = map_context o ProofContext.auto_bind_goal;
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val auto_bind_facts = map_context oo ProofContext.auto_bind_facts;
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val put_thms = map_context o ProofContext.put_thms;
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val put_thmss = map_context o ProofContext.put_thmss;
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val reset_thms = map_context o ProofContext.reset_thms;
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val assumptions = ProofContext.assumptions o context_of;
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val get_case = ProofContext.get_case o context_of;
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(* facts *)
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fun the_facts (State (Node {facts = Some facts, ...}, _)) = facts
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  | the_facts state = raise STATE ("No current facts available", state);
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fun the_fact state =
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  (case the_facts state of
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    [thm] => thm
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  | _ => raise STATE ("Single fact expected", state));
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fun assert_facts state = (the_facts state; state);
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fun get_facts (State (Node {facts, ...}, _)) = facts;
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val thisN = "this";
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fun put_facts facts state =
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  state
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  |> map_current (fn (ctxt, _, mode, goal) => (ctxt, facts, mode, goal))
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  |> (case facts of None => reset_thms thisN | Some ths => put_thms (thisN, ths));
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val reset_facts = put_facts None;
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fun these_factss (state, named_factss) =
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  state
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  |> put_thmss named_factss
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  |> put_facts (Some (flat (map #2 named_factss)));
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(* goal *)
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local
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  fun find i (state as State (Node {goal = Some goal, ...}, _)) = (context_of state, (i, goal))
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    | find i (State (Node {goal = None, ...}, node :: nodes)) = find (i + 1) (State (node, nodes))
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    | find _ (state as State (_, [])) = err_malformed "find_goal" state;
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in val find_goal = find 0 end;
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fun get_goal state =
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  let val (ctxt, (_, ((_, x), _))) = find_goal state
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  in (ctxt, x) end;
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fun put_goal goal = map_current (fn (ctxt, facts, mode, _) => (ctxt, facts, mode, goal));
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fun map_goal f g (State (Node {context, facts, mode, goal = Some goal}, nodes)) =
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      State (make_node (f context, facts, mode, Some (g goal)), nodes)
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  | map_goal f g (State (nd, node :: nodes)) =
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      let val State (node', nodes') = map_goal f g (State (node, nodes))
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      in map_context f (State (nd, node' :: nodes')) end
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  | map_goal _ _ state = state;
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fun goal_facts get state =
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  state
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  |> map_goal I (fn ((result, (_, thm)), f) => ((result, (get state, thm)), f));
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fun use_facts state =
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  state
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  |> goal_facts the_facts
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  |> reset_facts;
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(* mode *)
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fun get_mode (State (Node {mode, ...}, _)) = mode;
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fun put_mode mode = map_current (fn (ctxt, facts, _, goal) => (ctxt, facts, mode, goal));
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val enter_forward = put_mode Forward;
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val enter_forward_chain = put_mode ForwardChain;
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val enter_backward = put_mode Backward;
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fun assert_mode pred state =
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  let val mode = get_mode state in
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    if pred mode then state
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    else raise STATE ("Illegal application of proof command in "
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      ^ quote (mode_name mode) ^ " mode", state)
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  end;
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fun is_chain state = get_mode state = ForwardChain;
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val assert_forward = assert_mode (equal Forward);
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val assert_forward_or_chain = assert_mode (equal Forward orf equal ForwardChain);
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val assert_backward = assert_mode (equal Backward);
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val assert_no_chain = assert_mode (not_equal ForwardChain);
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(* blocks *)
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fun level (State (_, nodes)) = length nodes;
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fun open_block (State (node, nodes)) = State (node, node :: nodes);
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fun new_block state =
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  state
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  |> open_block
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  |> put_goal None;
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fun close_block (state as State (_, node :: nodes)) = State (node, nodes)
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  | close_block state = raise STATE ("Unbalanced block parentheses", state);
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(** print_state **)
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val show_hyps = ProofContext.show_hyps;
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val pretty_thm = ProofContext.pretty_thm;
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fun pretty_thms [th] = pretty_thm th
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  | pretty_thms ths = Pretty.blk (0, Pretty.fbreaks (map pretty_thm ths));
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val verbose = ProofContext.verbose;
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fun pretty_facts _ None = []
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  | pretty_facts s (Some ths) =
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      [Pretty.big_list (s ^ "this:") (map pretty_thm ths), Pretty.str ""];
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fun print_state nr (state as State (Node {context, facts, mode, goal = _}, nodes)) =
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  let
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    val ref (_, _, begin_goal) = Display.current_goals_markers;
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    fun levels_up 0 = ""
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      | levels_up 1 = ", 1 level up"
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      | levels_up i = ", " ^ string_of_int i ^ " levels up";
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    fun subgoals 0 = ""
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      | subgoals 1 = ", 1 subgoal"
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      | subgoals n = ", " ^ string_of_int n ^ " subgoals";
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    fun pretty_goal (_, (i, (((kind, name, _), (goal_facts, thm)), _))) =
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      pretty_facts "using "
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        (if mode <> Backward orelse null goal_facts then None else Some goal_facts) @
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      [Pretty.str ("goal (" ^ kind_name (sign_of state) kind ^
wenzelm@11556
   340
          (if name = "" then "" else " " ^ name) ^
wenzelm@11556
   341
            levels_up (i div 2) ^ subgoals (Thm.nprems_of thm) ^ "):")] @
wenzelm@11891
   342
      Display.pretty_goals_marker begin_goal (! goals_limit) thm;
wenzelm@6848
   343
wenzelm@8462
   344
    val ctxt_prts =
wenzelm@8462
   345
      if ! verbose orelse mode = Forward then ProofContext.pretty_context context
wenzelm@8462
   346
      else if mode = Backward then ProofContext.pretty_prems context
wenzelm@7575
   347
      else [];
wenzelm@8462
   348
wenzelm@8462
   349
    val prts =
wenzelm@8582
   350
     [Pretty.str ("proof (" ^ mode_name mode ^ "): step " ^ string_of_int nr ^
wenzelm@12010
   351
        (if ! verbose then ", depth " ^ string_of_int (length nodes div 2 - 1)
wenzelm@8561
   352
        else "")), Pretty.str ""] @
wenzelm@8462
   353
     (if null ctxt_prts then [] else ctxt_prts @ [Pretty.str ""]) @
wenzelm@8462
   354
     (if ! verbose orelse mode = Forward then
wenzelm@10553
   355
       (pretty_facts "" facts @ pretty_goal (find_goal state))
wenzelm@8462
   356
      else if mode = ForwardChain then pretty_facts "picking " facts
wenzelm@10553
   357
      else pretty_goal (find_goal state))
wenzelm@8462
   358
  in Pretty.writeln (Pretty.chunks prts) end;
wenzelm@5820
   359
wenzelm@10360
   360
fun pretty_goals main_goal state =
wenzelm@10553
   361
  let val (_, (_, ((_, (_, thm)), _))) = find_goal state
wenzelm@11891
   362
  in Display.pretty_sub_goals main_goal (! goals_limit) thm end;
wenzelm@10320
   363
wenzelm@5820
   364
wenzelm@5820
   365
wenzelm@5820
   366
(** proof steps **)
wenzelm@5820
   367
wenzelm@5820
   368
(* datatype method *)
wenzelm@5820
   369
wenzelm@8374
   370
datatype method =
wenzelm@8374
   371
  Method of thm list -> thm -> (thm * (string * RuleCases.T) list) Seq.seq;
wenzelm@8374
   372
wenzelm@8374
   373
fun method tac = Method (fn facts => fn st => Seq.map (rpair []) (tac facts st));
wenzelm@8374
   374
val method_cases = Method;
wenzelm@5820
   375
wenzelm@5820
   376
wenzelm@5820
   377
(* refine goal *)
wenzelm@5820
   378
wenzelm@8234
   379
local
wenzelm@8234
   380
wenzelm@5820
   381
fun check_sign sg state =
wenzelm@5820
   382
  if Sign.subsig (sg, sign_of state) then state
wenzelm@5820
   383
  else raise STATE ("Bad signature of result: " ^ Sign.str_of_sg sg, state);
wenzelm@5820
   384
wenzelm@8234
   385
fun gen_refine current_context meth_fun state =
wenzelm@6848
   386
  let
wenzelm@10553
   387
    val (goal_ctxt, (_, ((result, (facts, thm)), f))) = find_goal state;
wenzelm@8234
   388
    val Method meth = meth_fun (if current_context then context_of state else goal_ctxt);
wenzelm@5820
   389
wenzelm@8374
   390
    fun refn (thm', cases) =
wenzelm@6848
   391
      state
wenzelm@6848
   392
      |> check_sign (Thm.sign_of_thm thm')
wenzelm@8374
   393
      |> map_goal (ProofContext.add_cases cases) (K ((result, (facts, thm')), f));
wenzelm@6848
   394
  in Seq.map refn (meth facts thm) end;
wenzelm@5820
   395
wenzelm@8234
   396
in
wenzelm@8234
   397
wenzelm@8234
   398
val refine = gen_refine true;
wenzelm@8234
   399
val refine_end = gen_refine false;
wenzelm@8234
   400
wenzelm@8234
   401
end;
wenzelm@8234
   402
wenzelm@5820
   403
wenzelm@11917
   404
(* goal addressing *)
wenzelm@6932
   405
wenzelm@8152
   406
fun FINDGOAL tac st =
wenzelm@8374
   407
  let fun find (i, n) = if i > n then Seq.fail else Seq.APPEND (tac i, find (i + 1, n))
wenzelm@8374
   408
  in find (1, Thm.nprems_of st) st end;
wenzelm@8152
   409
wenzelm@8166
   410
fun HEADGOAL tac = tac 1;
wenzelm@8166
   411
wenzelm@9469
   412
wenzelm@9469
   413
(* export results *)
wenzelm@9469
   414
wenzelm@11816
   415
fun refine_tac rule =
wenzelm@11816
   416
  Tactic.rtac rule THEN_ALL_NEW (SUBGOAL (fn (goal, i) =>
wenzelm@11816
   417
    if can Logic.dest_goal (Logic.strip_assums_concl goal) then
wenzelm@11816
   418
      Tactic.etac Drule.triv_goal i
wenzelm@11816
   419
    else all_tac));
wenzelm@11816
   420
wenzelm@6982
   421
fun export_goal print_rule raw_rule inner state =
wenzelm@6932
   422
  let
wenzelm@10553
   423
    val (outer, (_, ((result, (facts, thm)), f))) = find_goal state;
wenzelm@12010
   424
    val exp_tac = ProofContext.export true inner outer;
wenzelm@9469
   425
    fun exp_rule rule =
wenzelm@9469
   426
      let
wenzelm@9469
   427
        val _ = print_rule rule;
wenzelm@11816
   428
        val thmq = FINDGOAL (refine_tac rule) thm;
wenzelm@9469
   429
      in Seq.map (fn th => map_goal I (K ((result, (facts, th)), f)) state) thmq end;
wenzelm@9469
   430
  in raw_rule |> exp_tac |> (Seq.flat o Seq.map exp_rule) end;
wenzelm@6932
   431
wenzelm@6932
   432
fun transfer_facts inner_state state =
wenzelm@6932
   433
  (case get_facts inner_state of
wenzelm@6932
   434
    None => Seq.single (reset_facts state)
wenzelm@8617
   435
  | Some thms =>
wenzelm@8617
   436
      let
wenzelm@12010
   437
        val exp_tac = ProofContext.export false (context_of inner_state) (context_of state);
wenzelm@11816
   438
        val thmqs = map exp_tac thms;
wenzelm@8617
   439
      in Seq.map (fn ths => put_facts (Some ths) state) (Seq.commute thmqs) end);
wenzelm@6932
   440
wenzelm@6932
   441
wenzelm@6932
   442
(* prepare result *)
wenzelm@6932
   443
wenzelm@6932
   444
fun prep_result state t raw_thm =
wenzelm@5820
   445
  let
wenzelm@5820
   446
    val ctxt = context_of state;
wenzelm@5820
   447
    fun err msg = raise STATE (msg, state);
wenzelm@5820
   448
wenzelm@5820
   449
    val ngoals = Thm.nprems_of raw_thm;
wenzelm@5820
   450
    val _ =
wenzelm@5820
   451
      if ngoals = 0 then ()
wenzelm@11891
   452
      else (Display.print_goals ngoals raw_thm; err (string_of_int ngoals ^ " unsolved goal(s)!"));
wenzelm@5820
   453
wenzelm@6932
   454
    val thm = raw_thm RS Drule.rev_triv_goal;
wenzelm@8617
   455
    val {hyps, prop, sign, ...} = Thm.rep_thm thm;
wenzelm@5820
   456
    val tsig = Sign.tsig_of sign;
wenzelm@6932
   457
wenzelm@9469
   458
    val casms = flat (map #1 (assumptions state));
wenzelm@11816
   459
    val bad_hyps = Library.gen_rems Term.aconv (hyps, map Thm.term_of casms);
wenzelm@5820
   460
  in
wenzelm@6932
   461
    if not (null bad_hyps) then
wenzelm@6932
   462
      err ("Additional hypotheses:\n" ^ cat_lines (map (Sign.string_of_term sign) bad_hyps))
wenzelm@10553
   463
    else if not (Pattern.matches (Sign.tsig_of (sign_of state)) (t, prop)) then
wenzelm@7605
   464
      err ("Proved a different theorem: " ^ Sign.string_of_term sign prop)
wenzelm@8617
   465
    else thm
wenzelm@5820
   466
  end;
wenzelm@5820
   467
wenzelm@5820
   468
wenzelm@5820
   469
wenzelm@5820
   470
(*** structured proof commands ***)
wenzelm@5820
   471
wenzelm@5820
   472
(** context **)
wenzelm@5820
   473
wenzelm@5820
   474
(* bind *)
wenzelm@5820
   475
wenzelm@5820
   476
fun gen_bind f x state =
wenzelm@5820
   477
  state
wenzelm@5820
   478
  |> assert_forward
wenzelm@5820
   479
  |> map_context (f x)
wenzelm@5820
   480
  |> reset_facts;
wenzelm@5820
   481
wenzelm@8617
   482
val match_bind = gen_bind (ProofContext.match_bind false);
wenzelm@8617
   483
val match_bind_i = gen_bind (ProofContext.match_bind_i false);
wenzelm@8617
   484
val let_bind = gen_bind (ProofContext.match_bind true);
wenzelm@8617
   485
val let_bind_i = gen_bind (ProofContext.match_bind_i true);
wenzelm@5820
   486
wenzelm@5820
   487
wenzelm@9196
   488
(* have_thmss etc. *)
wenzelm@5820
   489
wenzelm@9196
   490
fun have_thmss args state =
wenzelm@5820
   491
  state
wenzelm@5820
   492
  |> assert_forward
wenzelm@9196
   493
  |> map_context_result (ProofContext.have_thmss args)
wenzelm@9196
   494
  |> these_factss;
wenzelm@5820
   495
wenzelm@9196
   496
fun simple_have_thms name thms = have_thmss [((name, []), [(thms, [])])];
wenzelm@9196
   497
wenzelm@9196
   498
fun with_thmss args state =
wenzelm@9196
   499
  let val state' = state |> have_thmss args
wenzelm@9196
   500
  in state' |> simple_have_thms "" (the_facts state' @ the_facts state) end;
wenzelm@6876
   501
wenzelm@5820
   502
wenzelm@5820
   503
(* fix *)
wenzelm@5820
   504
wenzelm@5820
   505
fun gen_fix f xs state =
wenzelm@5820
   506
  state
wenzelm@5820
   507
  |> assert_forward
wenzelm@5820
   508
  |> map_context (f xs)
wenzelm@5820
   509
  |> reset_facts;
wenzelm@5820
   510
wenzelm@5820
   511
val fix = gen_fix ProofContext.fix;
wenzelm@5820
   512
val fix_i = gen_fix ProofContext.fix_i;
wenzelm@5820
   513
wenzelm@5820
   514
wenzelm@11891
   515
(* assume and presume *)
wenzelm@5820
   516
wenzelm@9469
   517
fun gen_assume f exp args state =
wenzelm@5820
   518
  state
wenzelm@5820
   519
  |> assert_forward
wenzelm@9469
   520
  |> map_context_result (f exp args)
wenzelm@11924
   521
  |> these_factss;
wenzelm@6932
   522
wenzelm@7271
   523
val assm = gen_assume ProofContext.assume;
wenzelm@7271
   524
val assm_i = gen_assume ProofContext.assume_i;
wenzelm@11917
   525
val assume = assm ProofContext.export_assume;
wenzelm@11917
   526
val assume_i = assm_i ProofContext.export_assume;
wenzelm@11917
   527
val presume = assm ProofContext.export_presume;
wenzelm@11917
   528
val presume_i = assm_i ProofContext.export_presume;
wenzelm@5820
   529
wenzelm@7271
   530
wenzelm@5820
   531
wenzelm@11891
   532
(** local definitions **)
wenzelm@11891
   533
wenzelm@11891
   534
fun gen_def fix prep_term prep_pats raw_name atts (x, (raw_rhs, raw_pats)) state =
wenzelm@11891
   535
  let
wenzelm@11891
   536
    val _ = assert_forward state;
wenzelm@11891
   537
    val ctxt = context_of state;
wenzelm@11891
   538
wenzelm@11891
   539
    (*rhs*)
wenzelm@11891
   540
    val name = if raw_name = "" then Thm.def_name x else raw_name;
wenzelm@11891
   541
    val rhs = prep_term ctxt raw_rhs;
wenzelm@11891
   542
    val T = Term.fastype_of rhs;
wenzelm@11891
   543
    val pats = prep_pats T (ProofContext.declare_term rhs ctxt) raw_pats;
wenzelm@11891
   544
wenzelm@11891
   545
    (*lhs*)
wenzelm@11891
   546
    val lhs = ProofContext.bind_skolem ctxt [x] (Free (x, T));
wenzelm@11891
   547
  in
wenzelm@11891
   548
    state
wenzelm@11891
   549
    |> fix [([x], None)]
wenzelm@11891
   550
    |> match_bind_i [(pats, rhs)]
wenzelm@11917
   551
    |> assm_i ProofContext.export_def [((name, atts), [(Logic.mk_equals (lhs, rhs), ([], []))])]
wenzelm@11891
   552
  end;
wenzelm@11891
   553
wenzelm@11891
   554
val def = gen_def fix ProofContext.read_term ProofContext.read_term_pats;
wenzelm@11891
   555
val def_i = gen_def fix_i ProofContext.cert_term ProofContext.cert_term_pats;
wenzelm@11891
   556
wenzelm@11891
   557
wenzelm@8374
   558
(* invoke_case *)
wenzelm@8374
   559
wenzelm@11793
   560
fun invoke_case (name, xs, atts) state =
wenzelm@9292
   561
  let
wenzelm@10830
   562
    val (state', (lets, asms)) =
wenzelm@11793
   563
      map_context_result (ProofContext.apply_case (get_case state name xs)) state;
wenzelm@9292
   564
  in
wenzelm@10830
   565
    state'
wenzelm@10809
   566
    |> add_binds_i lets
wenzelm@10830
   567
    |> assume_i [((name, atts), map (rpair ([], [])) asms)]
wenzelm@8374
   568
  end;
wenzelm@8374
   569
wenzelm@8374
   570
wenzelm@5820
   571
wenzelm@5820
   572
(** goals **)
wenzelm@5820
   573
wenzelm@5820
   574
(* forward chaining *)
wenzelm@5820
   575
wenzelm@5820
   576
fun chain state =
wenzelm@5820
   577
  state
wenzelm@5820
   578
  |> assert_forward
wenzelm@6848
   579
  |> assert_facts
wenzelm@5820
   580
  |> enter_forward_chain;
wenzelm@5820
   581
wenzelm@5820
   582
fun from_facts facts state =
wenzelm@5820
   583
  state
wenzelm@5820
   584
  |> put_facts (Some facts)
wenzelm@5820
   585
  |> chain;
wenzelm@5820
   586
wenzelm@5820
   587
wenzelm@5820
   588
(* setup goals *)
wenzelm@5820
   589
wenzelm@11549
   590
val rule_contextN = "rule_context";
wenzelm@8991
   591
wenzelm@12010
   592
fun setup_goal opt_block prepp autofix kind after_qed name raw_propp state =
wenzelm@5820
   593
  let
wenzelm@10464
   594
    val (state', ([[prop]], gen_binds)) =
wenzelm@5936
   595
      state
wenzelm@5936
   596
      |> assert_forward_or_chain
wenzelm@5936
   597
      |> enter_forward
wenzelm@8617
   598
      |> opt_block
wenzelm@10464
   599
      |> map_context_result (fn ct => prepp (ct, [[raw_propp]]));
wenzelm@6932
   600
    val cprop = Thm.cterm_of (sign_of state') prop;
wenzelm@7556
   601
    val goal = Drule.mk_triv_goal cprop;
wenzelm@10553
   602
wenzelm@10553
   603
    val tvars = Term.term_tvars prop;
wenzelm@10553
   604
    val vars = Term.term_vars prop;
wenzelm@5820
   605
  in
wenzelm@10553
   606
    if null tvars then ()
wenzelm@10553
   607
    else raise STATE ("Goal statement contains illegal schematic type variable(s): " ^
wenzelm@10553
   608
      commas (map (Syntax.string_of_vname o #1) tvars), state);
wenzelm@10553
   609
    if null vars then ()
wenzelm@10553
   610
    else warning ("Goal statement contains unbound schematic variable(s): " ^
wenzelm@10553
   611
      commas (map (Sign.string_of_term (sign_of state)) vars));
wenzelm@5936
   612
    state'
wenzelm@12010
   613
    |> map_context (autofix prop)
wenzelm@12010
   614
    |> put_goal (Some (((kind, name, prop), ([], goal)), after_qed o map_context gen_binds))
wenzelm@11549
   615
    |> map_context (ProofContext.add_cases (RuleCases.make true goal [rule_contextN]))
wenzelm@6790
   616
    |> auto_bind_goal prop
wenzelm@5820
   617
    |> (if is_chain state then use_facts else reset_facts)
wenzelm@5820
   618
    |> new_block
wenzelm@5820
   619
    |> enter_backward
wenzelm@5820
   620
  end;
wenzelm@5820
   621
wenzelm@5820
   622
(*global goals*)
wenzelm@12045
   623
fun global_goal prepp act_locale act_elems kind locale elems name atts x thy =
wenzelm@12045
   624
  thy |> init_state
wenzelm@12045
   625
  |> open_block |> (case locale of Some loc => map_context (act_locale loc) | None => I)
wenzelm@12045
   626
  |> open_block |> map_context (act_elems elems)
wenzelm@12045
   627
  |> setup_goal I prepp (ProofContext.fix_frees o single) (Theorem (kind, locale, atts))
wenzelm@12045
   628
    Seq.single name x;
wenzelm@5820
   629
wenzelm@12045
   630
val theorem = global_goal ProofContext.bind_propp_schematic
wenzelm@12045
   631
  Locale.activate_locale Locale.activate_elements;
wenzelm@12045
   632
wenzelm@12045
   633
val theorem_i = global_goal ProofContext.bind_propp_schematic_i
wenzelm@12045
   634
  Locale.activate_locale_i Locale.activate_elements_i;
wenzelm@5820
   635
wenzelm@5820
   636
wenzelm@5820
   637
(*local goals*)
wenzelm@10938
   638
fun local_goal' prepp kind (check: bool -> state -> state)
wenzelm@10938
   639
    f name atts args int state =
wenzelm@7928
   640
  state
wenzelm@12010
   641
  |> setup_goal open_block prepp (K I) (kind atts) f name args
wenzelm@10936
   642
  |> warn_extra_tfrees state
wenzelm@10936
   643
  |> check int;
wenzelm@5820
   644
wenzelm@10936
   645
fun local_goal prepp kind f name atts args =
wenzelm@10936
   646
  local_goal' prepp kind (K I) f name atts args false;
wenzelm@10936
   647
wenzelm@10936
   648
val show = local_goal' ProofContext.bind_propp Show;
wenzelm@10936
   649
val show_i = local_goal' ProofContext.bind_propp_i Show;
wenzelm@10936
   650
val have = local_goal ProofContext.bind_propp Have;
wenzelm@10380
   651
val have_i = local_goal ProofContext.bind_propp_i Have;
wenzelm@5820
   652
wenzelm@5820
   653
wenzelm@5820
   654
wenzelm@5820
   655
(** conclusions **)
wenzelm@5820
   656
wenzelm@5820
   657
(* current goal *)
wenzelm@5820
   658
wenzelm@7176
   659
fun current_goal (State (Node {context, goal = Some goal, ...}, _)) = (context, goal)
wenzelm@5820
   660
  | current_goal state = raise STATE ("No current goal!", state);
wenzelm@5820
   661
wenzelm@7176
   662
fun assert_current_goal true (state as State (Node {goal = None, ...}, _)) =
wenzelm@6404
   663
      raise STATE ("No goal in this block!", state)
wenzelm@7176
   664
  | assert_current_goal false (state as State (Node {goal = Some _, ...}, _)) =
wenzelm@6404
   665
      raise STATE ("Goal present in this block!", state)
wenzelm@6404
   666
  | assert_current_goal _ state = state;
wenzelm@5820
   667
wenzelm@12010
   668
fun assert_bottom b (state as State (_, nodes)) =
wenzelm@12010
   669
  let val bot = (length nodes <= 2) in
wenzelm@12010
   670
    if b andalso not bot then raise STATE ("Not at bottom of proof!", state)
wenzelm@12010
   671
    else if not b andalso bot then raise STATE ("Already at bottom of proof!", state)
wenzelm@12010
   672
    else state
wenzelm@12010
   673
  end;
wenzelm@5820
   674
wenzelm@6404
   675
val at_bottom = can (assert_bottom true o close_block);
wenzelm@6404
   676
wenzelm@6932
   677
fun end_proof bot state =
wenzelm@5820
   678
  state
wenzelm@5820
   679
  |> assert_forward
wenzelm@5820
   680
  |> close_block
wenzelm@5820
   681
  |> assert_bottom bot
wenzelm@7011
   682
  |> assert_current_goal true
wenzelm@7011
   683
  |> goal_facts (K []);
wenzelm@5820
   684
wenzelm@5820
   685
wenzelm@6404
   686
(* local_qed *)
wenzelm@5820
   687
wenzelm@6982
   688
fun finish_local (print_result, print_rule) state =
wenzelm@5820
   689
  let
wenzelm@8617
   690
    val (goal_ctxt, (((kind, name, t), (_, raw_thm)), after_qed)) = current_goal state;
wenzelm@8617
   691
    val outer_state = state |> close_block;
wenzelm@8617
   692
    val outer_ctxt = context_of outer_state;
wenzelm@8617
   693
wenzelm@6932
   694
    val result = prep_result state t raw_thm;
wenzelm@12010
   695
    val resultq = ProofContext.export false goal_ctxt outer_ctxt result;
wenzelm@9469
   696
wenzelm@5820
   697
    val (atts, opt_solve) =
wenzelm@5820
   698
      (case kind of
wenzelm@10380
   699
        Show atts => (atts, export_goal print_rule result goal_ctxt)
wenzelm@10380
   700
      | Have atts => (atts, Seq.single)
wenzelm@6932
   701
      | _ => err_malformed "finish_local" state);
wenzelm@5820
   702
  in
wenzelm@12015
   703
    print_result {kind = kind_name (sign_of state) kind, name = name, thm = result};
wenzelm@8617
   704
    outer_state
wenzelm@8617
   705
    |> auto_bind_facts name [ProofContext.generalize goal_ctxt outer_ctxt t]
wenzelm@9469
   706
    |> (fn st => Seq.map (fn res =>
wenzelm@9469
   707
      have_thmss [((name, atts), [Thm.no_attributes [res]])] st) resultq)
wenzelm@9469
   708
    |> (Seq.flat o Seq.map opt_solve)
wenzelm@7176
   709
    |> (Seq.flat o Seq.map after_qed)
wenzelm@5820
   710
  end;
wenzelm@5820
   711
wenzelm@6982
   712
fun local_qed finalize print state =
wenzelm@6404
   713
  state
wenzelm@6932
   714
  |> end_proof false
wenzelm@6871
   715
  |> finalize
wenzelm@6982
   716
  |> (Seq.flat o Seq.map (finish_local print));
wenzelm@5820
   717
wenzelm@5820
   718
wenzelm@6404
   719
(* global_qed *)
wenzelm@5820
   720
wenzelm@6950
   721
fun finish_global state =
wenzelm@5820
   722
  let
wenzelm@12010
   723
    val (goal_ctxt, (((kind, name, t), (_, raw_thm)), _)) = current_goal state;
wenzelm@12010
   724
    val full_name = if name = "" then "" else Sign.full_name (sign_of state) name;
wenzelm@12010
   725
    val locale_context = context_of (state |> close_block);  (* FIXME unused *)
wenzelm@12010
   726
    val theory_context = context_of (state |> close_block |> close_block);
wenzelm@12010
   727
wenzelm@12010
   728
    val result = prep_result state t raw_thm;
wenzelm@12010
   729
    val resultq =
wenzelm@12010
   730
      ProofContext.export false goal_ctxt theory_context result
wenzelm@12010
   731
      |> Seq.map Drule.local_standard;
wenzelm@5820
   732
wenzelm@12010
   733
    val (atts, opt_locale) =
wenzelm@12010
   734
      (case kind of Theorem (s, loc, atts) => (atts @ [Drule.kind s], loc)
wenzelm@6932
   735
      | _ => err_malformed "finish_global" state);
wenzelm@12010
   736
    val thy = theory_of state;
wenzelm@12010
   737
  in
wenzelm@12010
   738
    resultq |> Seq.map (fn res =>
wenzelm@12010
   739
      let val (thy', res') = PureThy.store_thm ((name, res), atts) thy
wenzelm@12015
   740
      in (thy', {kind = kind_name (sign_of state) kind, name = name, thm = res'}) end)
wenzelm@12010
   741
  end;
wenzelm@5820
   742
wenzelm@10553
   743
(*note: clients should inspect first result only, as backtracking may destroy theory*)
wenzelm@6950
   744
fun global_qed finalize state =
wenzelm@5820
   745
  state
wenzelm@6932
   746
  |> end_proof true
wenzelm@6871
   747
  |> finalize
wenzelm@12010
   748
  |> Seq.map finish_global
wenzelm@12010
   749
  |> Seq.flat;
wenzelm@5820
   750
wenzelm@5820
   751
wenzelm@6896
   752
wenzelm@6896
   753
(** blocks **)
wenzelm@6896
   754
wenzelm@6896
   755
(* begin_block *)
wenzelm@6896
   756
wenzelm@6896
   757
fun begin_block state =
wenzelm@6896
   758
  state
wenzelm@6896
   759
  |> assert_forward
wenzelm@6896
   760
  |> new_block
wenzelm@6896
   761
  |> open_block;
wenzelm@6896
   762
wenzelm@6896
   763
wenzelm@6896
   764
(* end_block *)
wenzelm@6896
   765
wenzelm@6896
   766
fun end_block state =
wenzelm@6896
   767
  state
wenzelm@6896
   768
  |> assert_forward
wenzelm@6896
   769
  |> close_block
wenzelm@6896
   770
  |> assert_current_goal false
wenzelm@6896
   771
  |> close_block
wenzelm@6932
   772
  |> transfer_facts state;
wenzelm@6896
   773
wenzelm@6896
   774
wenzelm@6896
   775
(* next_block *)
wenzelm@6896
   776
wenzelm@6896
   777
fun next_block state =
wenzelm@6896
   778
  state
wenzelm@6896
   779
  |> assert_forward
wenzelm@6896
   780
  |> close_block
wenzelm@8718
   781
  |> new_block
wenzelm@8718
   782
  |> reset_facts;
wenzelm@6896
   783
wenzelm@6896
   784
wenzelm@5820
   785
end;
wenzelm@8152
   786
wenzelm@8152
   787
structure BasicProof: BASIC_PROOF = Proof;
wenzelm@8152
   788
open BasicProof;