author  wenzelm 
Thu, 02 Oct 2008 14:22:40 +0200  
changeset 28458  0966ac3f4a40 
parent 28452  a72670460833 
child 28627  63663cfa297c 
permissions  rwrr 
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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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The Isar/VM proof language interpreter: maintains a structured flow of 
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context elements, goals, refinements, and facts. 

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*) 
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signature PROOF = 

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sig 

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type context = Context.proof 
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type method = Method.method 

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type state 
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val init: context > state 
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val level: state > int 

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val assert_bottom: bool > state > state 

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val context_of: state > context 
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val theory_of: state > theory 

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val map_context: (context > context) > state > state 
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val map_contexts: (context > context) > state > state 
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val add_binds_i: (indexname * term option) list > state > state 
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val put_thms: bool > string * thm list option > 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 put_facts: thm list option > state > state 
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val assert_forward: state > state 
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val assert_chain: 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 goal_message: (unit > Pretty.T) > state > state 
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val get_goal: state > context * (thm list * thm) 
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val schematic_goal: state > bool 
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val show_main_goal: bool ref 
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val verbose: bool ref 
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val pretty_state: int > state > Pretty.T list 
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val pretty_goals: bool > state > Pretty.T list 
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val refine: Method.text > state > state Seq.seq 
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val refine_end: Method.text > state > state Seq.seq 

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val refine_insert: thm list > state > state 
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val goal_tac: thm > int > tactic 
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val refine_goals: (context > thm > unit) > context > thm list > 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 fix: (Name.binding * string option * mixfix) list > state > state 
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val fix_i: (Name.binding * typ option * mixfix) list > state > state 
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val assm: Assumption.export > 
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(Attrib.binding * (string * string list) list) list > state > state 
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val assm_i: Assumption.export > 
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((Name.binding * attribute list) * (term * term list) list) list > state > state 
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type Attrib.binding abbreviates Name.binding without attributes;
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val assume: (Attrib.binding * (string * string list) list) list > state > state 
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val assume_i: ((Name.binding * attribute list) * (term * term list) list) list > 
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state > state 
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val presume: (Attrib.binding * (string * string list) list) list > state > state 
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val presume_i: ((Name.binding * attribute list) * (term * term list) list) list > 
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state > state 
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val def: (Attrib.binding * ((Name.binding * mixfix) * (string * string list))) list > 
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state > state 
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val def_i: ((Name.binding * attribute list) * 
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((Name.binding * mixfix) * (term * term list))) list > state > state 
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val chain: state > state 
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val chain_facts: thm list > state > state 

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val get_thmss: state > (Facts.ref * Attrib.src list) list > thm list 
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val note_thmss: (Attrib.binding * (Facts.ref * Attrib.src list) list) list > state > state 
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val note_thmss_i: ((Name.binding * attribute list) * 
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(thm list * attribute list) list) list > state > state 
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val from_thmss: ((Facts.ref * Attrib.src list) list) list > state > state 
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val from_thmss_i: ((thm list * attribute list) list) list > state > state 
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val with_thmss: ((Facts.ref * Attrib.src list) list) list > state > state 
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val with_thmss_i: ((thm list * attribute list) list) list > state > state 
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val using: ((Facts.ref * Attrib.src list) list) list > state > state 
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val using_i: ((thm list * attribute list) list) list > state > state 
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val unfolding: ((Facts.ref * Attrib.src list) list) list > state > state 
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val unfolding_i: ((thm list * attribute list) list) list > state > state 
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val invoke_case: string * string option list * Attrib.src list > state > state 
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val invoke_case_i: string * string option list * attribute list > state > state 
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val begin_block: state > state 
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val next_block: state > state 

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val end_block: state > state 
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val proof: Method.text option > state > state Seq.seq 
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val defer: int option > state > state Seq.seq 

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val prefer: int > state > state Seq.seq 

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val apply: Method.text > state > state Seq.seq 

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val apply_end: Method.text > state > state Seq.seq 

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val local_goal: (context > ((string * string) * (string * thm list) list) > unit) > 
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(theory > 'a > attribute) > 
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(context * 'b list > context * (term list list * (context > context))) > 
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string > Method.text option > (thm list list > state > state Seq.seq) > 
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((Name.binding * 'a list) * 'b) list > state > state 
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val local_qed: Method.text option * bool > state > state Seq.seq 
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val theorem: Method.text option > (thm list list > context > context) > 
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(string * string list) list list > context > state 
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val theorem_i: Method.text option > (thm list list > context > context) > 
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(term * term list) list list > context > state 
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global goals/qeds: after_qed operates on Proof.context (potentially local_theory);
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val global_qed: Method.text option * bool > state > context 
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val local_terminal_proof: Method.text * Method.text option > state > state Seq.seq 
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val local_default_proof: state > state Seq.seq 

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val local_immediate_proof: state > state Seq.seq 

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val local_done_proof: state > state Seq.seq 

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val local_skip_proof: bool > state > state Seq.seq 

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val global_terminal_proof: Method.text * Method.text option > state > context 
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val global_default_proof: state > context 
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val global_immediate_proof: state > context 
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val global_done_proof: state > context 
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val global_skip_proof: bool > state > context 
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val have: Method.text option > (thm list list > state > state Seq.seq) > 
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(Attrib.binding * (string * string list) list) list > bool > state > state 
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val have_i: Method.text option > (thm list list > state > state Seq.seq) > 
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((Name.binding * attribute list) * (term * term list) list) list > bool > state > state 
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val show: Method.text option > (thm list list > state > state Seq.seq) > 
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(Attrib.binding * (string * string list) list) list > bool > state > state 
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val show_i: Method.text option > (thm list list > state > state Seq.seq) > 
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((Name.binding * attribute list) * (term * term list) list) list > bool > state > state 
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val is_relevant: state > bool 
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val future_proof: (state > context) > state > context 
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end; 
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structure Proof: PROOF = 
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struct 
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type context = Context.proof; 
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type method = Method.method; 
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(** proof state **) 

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(* datatype state *) 
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datatype mode = Forward  Chain  Backward; 
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datatype state = 
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State of node Stack.T 

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and 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 option} 
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and goal = 

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Goal of 

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{statement: (string * Position.T) * term list list * cterm, 
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(*goal kind and statement (starting with vars), initial proposition*) 

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messages: (unit > Pretty.T) list, (*persistent messages (hints etc.)*) 
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using: thm list, (*goal facts*) 

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goal: thm, (*subgoals ==> statement*) 

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before_qed: Method.text option, 
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after_qed: 
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(thm list list > state > state Seq.seq) * 

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(thm list list > context > context)}; 
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fun make_goal (statement, messages, using, goal, before_qed, after_qed) = 
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Goal {statement = statement, messages = messages, using = using, goal = goal, 

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before_qed = before_qed, after_qed = after_qed}; 
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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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fun map_node f (Node {context, facts, mode, goal}) = 
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make_node (f (context, facts, mode, goal)); 

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val init_context = 
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ProofContext.set_stmt true #> ProofContext.reset_naming; 

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fun init ctxt = 
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State (Stack.init (make_node (init_context ctxt, NONE, Forward, NONE))); 
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fun current (State st) = Stack.top st > (fn Node node => node); 
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fun map_current f (State st) = State (Stack.map_top (map_node f) st); 
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fun map_all f (State st) = State (Stack.map_all (map_node f) st); 
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(** basic proof state operations **) 

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(* block structure *) 
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fun open_block (State st) = State (Stack.push st); 

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fun close_block (State st) = State (Stack.pop st) 
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handle Empty => error "Unbalanced block parentheses"; 

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fun level (State st) = Stack.level st; 

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fun assert_bottom b state = 

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let val b' = (level state <= 2) in 

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if b andalso not b' then error "Not at bottom of proof!" 
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else if not b andalso b' then error "Already at bottom of proof!" 

17359  191 
else state 
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end; 

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(* context *) 
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val context_of = #context o current; 
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val theory_of = ProofContext.theory_of o context_of; 
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fun map_context f = 
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map_current (fn (ctxt, facts, mode, goal) => (f ctxt, facts, mode, goal)); 

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fun map_context_result f state = 
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f (context_of state) > (fn ctxt => map_context (K ctxt) state); 
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fun map_contexts f = map_all (fn (ctxt, facts, mode, goal) => (f ctxt, facts, mode, goal)); 
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val add_binds_i = map_context o ProofContext.add_binds_i; 
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val put_thms = map_context oo ProofContext.put_thms; 
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(* facts *) 

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val get_facts = #facts o current; 
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fun the_facts state = 

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(case get_facts state of SOME facts => facts 

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 NONE => error "No current facts available"); 
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fun the_fact state = 
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(case the_facts state of [thm] => thm 
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 _ => error "Single theorem expected"); 
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fun put_facts facts = 
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map_current (fn (ctxt, _, mode, goal) => (ctxt, facts, mode, goal)) #> 
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put_thms true (AutoBind.thisN, facts); 
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fun these_factss more_facts (named_factss, state) = 
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(named_factss, state > put_facts (SOME (maps snd named_factss @ more_facts))); 
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fun export_facts inner outer = 
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(case get_facts inner of 

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NONE => put_facts NONE outer 
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 SOME thms => 
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thms 

20309  236 
> ProofContext.export (context_of inner) (context_of outer) 
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> (fn ths => put_facts (SOME ths) outer)); 

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(* mode *) 

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val get_mode = #mode o current; 
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fun put_mode mode = map_current (fn (ctxt, facts, _, goal) => (ctxt, facts, mode, goal)); 
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val mode_name = (fn Forward => "state"  Chain => "chain"  Backward => "prove"); 
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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 

18678  250 
else error ("Illegal application of proof command in " ^ quote (mode_name mode) ^ " mode") 
5820  251 
end; 
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val assert_forward = assert_mode (fn mode => mode = Forward); 
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val assert_chain = assert_mode (fn mode => mode = Chain); 

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val assert_forward_or_chain = assert_mode (fn mode => mode = Forward orelse mode = Chain); 

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val assert_backward = assert_mode (fn mode => mode = Backward); 

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val assert_no_chain = assert_mode (fn mode => mode <> Chain); 

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val enter_forward = put_mode Forward; 
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val enter_chain = put_mode Chain; 

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val enter_backward = put_mode Backward; 

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17359  263 

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(* current goal *) 

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fun current_goal state = 

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(case current state of 

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{context, goal = SOME (Goal goal), ...} => (context, goal) 

18678  269 
 _ => error "No current goal!"); 
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fun assert_current_goal g state = 
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let val g' = can current_goal state in 

18678  273 
if g andalso not g' then error "No goal in this block!" 
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else if not g andalso g' then error "Goal present in this block!" 

17359  275 
else state 
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end; 

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fun put_goal goal = map_current (fn (ctxt, using, mode, _) => (ctxt, using, mode, goal)); 
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val before_qed = #before_qed o #2 o current_goal; 
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(* nested goal *) 

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fun map_goal f g (State (Node {context, facts, mode, goal = SOME goal}, nodes)) = 
286 
let 

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val Goal {statement, messages, using, goal, before_qed, after_qed} = goal; 
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val goal' = make_goal (g (statement, messages, using, goal, before_qed, after_qed)); 

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in State (make_node (f context, facts, mode, SOME goal'), nodes) end 
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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 set_goal goal = map_goal I (fn (statement, _, using, _, before_qed, after_qed) => 
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(statement, [], using, goal, before_qed, after_qed)); 

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fun goal_message msg = map_goal I (fn (statement, messages, using, goal, before_qed, after_qed) => 
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(statement, msg :: messages, using, goal, before_qed, after_qed)); 

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fun using_facts using = map_goal I (fn (statement, _, _, goal, before_qed, after_qed) => 
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(statement, [], using, goal, before_qed, after_qed)); 

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local 

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fun find i state = 

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(case try current_goal state of 

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SOME (ctxt, goal) => (ctxt, (i, goal)) 

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 NONE => find (i + 1) (close_block state handle ERROR _ => error "No goal present")); 
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in val find_goal = find 0 end; 
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311 
fun get_goal state = 

312 
let val (ctxt, (_, {using, goal, ...})) = find_goal state 

313 
in (ctxt, (using, goal)) end; 

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fun schematic_goal state = 
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let val (_, (_, {statement = (_, _, prop), ...})) = find_goal state in 
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Term.exists_subterm Term.is_Var (Thm.term_of prop) orelse 

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Term.exists_type (Term.exists_subtype Term.is_TVar) (Thm.term_of prop) 

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end; 
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(** pretty_state **) 
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13869  325 
val show_main_goal = ref false; 
16539  326 
val verbose = ProofContext.verbose; 
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val pretty_goals_local = Display.pretty_goals_aux o Syntax.pp; 
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15531  330 
fun pretty_facts _ _ NONE = [] 
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 pretty_facts s ctxt (SOME ths) = 

12055  332 
[Pretty.big_list (s ^ "this:") (map (ProofContext.pretty_thm ctxt) ths), Pretty.str ""]; 
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fun pretty_state nr state = 
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let 
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val {context, facts, mode, goal = _} = current state; 
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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" 
344 
 subgoals n = string_of_int n ^ " subgoals"; 

345 

346 
fun description strs = 

28375  347 
(case filter_out (fn s => s = "") strs of [] => "" 
17359  348 
 strs' => enclose " (" ")" (commas strs')); 
12146  349 

24550  350 
fun prt_goal (SOME (ctxt, (i, 
28410  351 
{statement = ((_, pos), _, _), messages, using, goal, before_qed, after_qed}))) = 
17359  352 
pretty_facts "using " ctxt 
353 
(if mode <> Backward orelse null using then NONE else SOME using) @ 

21442  354 
[Pretty.str ("goal" ^ 
355 
description [levels_up (i div 2), subgoals (Thm.nprems_of goal)] ^ ":")] @ 

23639  356 
pretty_goals_local ctxt Markup.subgoal 
24543  357 
(true, ! show_main_goal) (! Display.goals_limit) goal @ 
25958  358 
(map (fn msg => Position.setmp_thread_data pos msg ()) (rev messages)) 
17359  359 
 prt_goal NONE = []; 
6848  360 

17359  361 
val prt_ctxt = 
362 
if ! verbose orelse mode = Forward then ProofContext.pretty_context context 

18670  363 
else if mode = Backward then ProofContext.pretty_ctxt context 
7575  364 
else []; 
17359  365 
in 
366 
[Pretty.str ("proof (" ^ mode_name mode ^ "): step " ^ string_of_int nr ^ 

367 
(if ! verbose then ", depth " ^ string_of_int (level state div 2  1) else "")), 

368 
Pretty.str ""] @ 

369 
(if null prt_ctxt then [] else prt_ctxt @ [Pretty.str ""]) @ 

370 
(if ! verbose orelse mode = Forward then 

371 
pretty_facts "" context facts @ prt_goal (try find_goal state) 

372 
else if mode = Chain then pretty_facts "picking " context facts 

373 
else prt_goal (try find_goal state)) 

374 
end; 

5820  375 

12085  376 
fun pretty_goals main state = 
19188  377 
let val (ctxt, (_, goal)) = get_goal state 
23639  378 
in pretty_goals_local ctxt Markup.none (false, main) (! Display.goals_limit) goal end; 
10320  379 

5820  380 

381 

382 
(** proof steps **) 

383 

17359  384 
(* refine via method *) 
5820  385 

8234  386 
local 
387 

16146  388 
fun goalN i = "goal" ^ string_of_int i; 
389 
fun goals st = map goalN (1 upto Thm.nprems_of st); 

390 

391 
fun no_goal_cases st = map (rpair NONE) (goals st); 

392 

393 
fun goal_cases st = 

18607  394 
RuleCases.make_common true (Thm.theory_of_thm st, Thm.prop_of st) (map (rpair []) (goals st)); 
16146  395 

25958  396 
fun apply_method current_context pos meth state = 
6848  397 
let 
24556  398 
val (goal_ctxt, (_, {statement, messages = _, using, goal, before_qed, after_qed})) = 
24543  399 
find_goal state; 
25958  400 
val ctxt = if current_context then context_of state else goal_ctxt; 
16146  401 
in 
25958  402 
Method.apply pos meth ctxt using goal > Seq.map (fn (meth_cases, goal') => 
6848  403 
state 
16146  404 
> map_goal 
18475  405 
(ProofContext.add_cases false (no_goal_cases goal @ goal_cases goal') #> 
406 
ProofContext.add_cases true meth_cases) 

24556  407 
(K (statement, [], using, goal', before_qed, after_qed))) 
16146  408 
end; 
5820  409 

19188  410 
fun select_goals n meth state = 
19224  411 
state 
412 
> (#2 o #2 o get_goal) 

21687  413 
> ALLGOALS Goal.conjunction_tac 
19224  414 
> Seq.maps (fn goal => 
19188  415 
state 
21687  416 
> Seq.lift set_goal (Goal.extract 1 n goal > Seq.maps (Goal.conjunction_tac 1)) 
19188  417 
> Seq.maps meth 
418 
> Seq.maps (fn state' => state' 

419 
> Seq.lift set_goal (Goal.retrofit 1 n (#2 (#2 (get_goal state'))) goal)) 

23360  420 
> Seq.maps (apply_method true Position.none (K Method.succeed))); 
19188  421 

17112  422 
fun apply_text cc text state = 
423 
let 

424 
val thy = theory_of state; 

23360  425 
val pos_of = #2 o Args.dest_src; 
17112  426 

23360  427 
fun eval (Method.Basic (m, pos)) = apply_method cc pos m 
428 
 eval (Method.Source src) = apply_method cc (pos_of src) (Method.method thy src) 

429 
 eval (Method.Source_i src) = apply_method cc (pos_of src) (Method.method_i thy src) 

17112  430 
 eval (Method.Then txts) = Seq.EVERY (map eval txts) 
431 
 eval (Method.Orelse txts) = Seq.FIRST (map eval txts) 

432 
 eval (Method.Try txt) = Seq.TRY (eval txt) 

19188  433 
 eval (Method.Repeat1 txt) = Seq.REPEAT1 (eval txt) 
434 
 eval (Method.SelectGoals (n, txt)) = select_goals n (eval txt); 

17112  435 
in eval text state end; 
436 

8234  437 
in 
438 

17112  439 
val refine = apply_text true; 
440 
val refine_end = apply_text false; 

8234  441 

18908  442 
fun refine_insert [] = I 
23360  443 
 refine_insert ths = Seq.hd o refine (Method.Basic (K (Method.insert ths), Position.none)); 
18908  444 

8234  445 
end; 
446 

5820  447 

17359  448 
(* refine via subproof *) 
449 

20208  450 
fun goal_tac rule = 
21687  451 
Goal.norm_hhf_tac THEN' Tactic.rtac rule THEN_ALL_NEW 
452 
(Goal.norm_hhf_tac THEN' (SUBGOAL (fn (goal, i) => 

18186  453 
if can Logic.unprotect (Logic.strip_assums_concl goal) then 
454 
Tactic.etac Drule.protectI i 

455 
else all_tac))); 

11816  456 

19915  457 
fun refine_goals print_rule inner raw_rules state = 
458 
let 

459 
val (outer, (_, goal)) = get_goal state; 

20208  460 
fun refine rule st = (print_rule outer rule; FINDGOAL (goal_tac rule) st); 
19915  461 
in 
462 
raw_rules 

20309  463 
> ProofContext.goal_export inner outer 
464 
> (fn rules => Seq.lift set_goal (EVERY (map refine rules) goal) state) 

19915  465 
end; 
17359  466 

6932  467 

17359  468 
(* conclude_goal *) 
6932  469 

18503
841137f20307
goal/qed: proper treatment of two levels of conjunctions;
wenzelm
parents:
18475
diff
changeset

470 
fun conclude_goal state goal propss = 
5820  471 
let 
19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

472 
val thy = theory_of state; 
5820  473 
val ctxt = context_of state; 
24920  474 
val string_of_term = Syntax.string_of_term ctxt; 
19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

475 
val string_of_thm = ProofContext.string_of_thm ctxt; 
5820  476 

17359  477 
val ngoals = Thm.nprems_of goal; 
19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

478 
val _ = ngoals = 0 orelse error (Pretty.string_of (Pretty.chunks 
23639  479 
(pretty_goals_local ctxt Markup.none (true, ! show_main_goal) (! Display.goals_limit) goal @ 
480 
[Pretty.str (string_of_int ngoals ^ " unsolved goal(s)!")]))); 

20224
9c40a144ee0e
moved basic assumption operations from structure ProofContext to Assumption;
wenzelm
parents:
20208
diff
changeset

481 

9c40a144ee0e
moved basic assumption operations from structure ProofContext to Assumption;
wenzelm
parents:
20208
diff
changeset

482 
val extra_hyps = Assumption.extra_hyps ctxt goal; 
9c40a144ee0e
moved basic assumption operations from structure ProofContext to Assumption;
wenzelm
parents:
20208
diff
changeset

483 
val _ = null extra_hyps orelse 
9c40a144ee0e
moved basic assumption operations from structure ProofContext to Assumption;
wenzelm
parents:
20208
diff
changeset

484 
error ("Additional hypotheses:\n" ^ cat_lines (map string_of_term extra_hyps)); 
5820  485 

23418  486 
fun lost_structure () = error ("Lost goal structure:\n" ^ string_of_thm goal); 
487 

23782
4dd0ba632e40
Proof terms for metaconjunctions are now normalized before
berghofe
parents:
23639
diff
changeset

488 
val th = Goal.conclude 
23806  489 
(if length (flat propss) > 1 then Thm.norm_proof goal else goal) 
23782
4dd0ba632e40
Proof terms for metaconjunctions are now normalized before
berghofe
parents:
23639
diff
changeset

490 
handle THM _ => lost_structure (); 
23418  491 
val goal_propss = filter_out null propss; 
492 
val results = 

493 
Conjunction.elim_balanced (length goal_propss) th 

494 
> map2 Conjunction.elim_balanced (map length goal_propss) 

495 
handle THM _ => lost_structure (); 

496 
val _ = Unify.matches_list thy (flat goal_propss) (map Thm.prop_of (flat results)) orelse 

19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

497 
error ("Proved a different theorem:\n" ^ string_of_thm th); 
23418  498 

499 
fun recover_result ([] :: pss) thss = [] :: recover_result pss thss 

500 
 recover_result (_ :: pss) (ths :: thss) = ths :: recover_result pss thss 

501 
 recover_result [] [] = [] 

502 
 recover_result _ _ = lost_structure (); 

503 
in recover_result propss results end; 

5820  504 

505 

506 

507 
(*** structured proof commands ***) 

508 

17112  509 
(** context elements **) 
5820  510 

17112  511 
(* bindings *) 
5820  512 

16813  513 
local 
514 

17359  515 
fun gen_bind bind args state = 
5820  516 
state 
517 
> assert_forward 

18308  518 
> map_context (bind args #> snd) 
17359  519 
> put_facts NONE; 
5820  520 

16813  521 
in 
522 

8617
33e2bd53aec3
support HindleyMilner polymorphisms in binds and facts;
wenzelm
parents:
8582
diff
changeset

523 
val match_bind = gen_bind (ProofContext.match_bind false); 
33e2bd53aec3
support HindleyMilner polymorphisms in binds and facts;
wenzelm
parents:
8582
diff
changeset

524 
val match_bind_i = gen_bind (ProofContext.match_bind_i false); 
33e2bd53aec3
support HindleyMilner polymorphisms in binds and facts;
wenzelm
parents:
8582
diff
changeset

525 
val let_bind = gen_bind (ProofContext.match_bind true); 
33e2bd53aec3
support HindleyMilner polymorphisms in binds and facts;
wenzelm
parents:
8582
diff
changeset

526 
val let_bind_i = gen_bind (ProofContext.match_bind_i true); 
5820  527 

16813  528 
end; 
529 

5820  530 

17359  531 
(* fix *) 
9196  532 

12714  533 
local 
534 

18670  535 
fun gen_fix add_fixes args = 
17359  536 
assert_forward 
19846  537 
#> map_context (snd o add_fixes args) 
17359  538 
#> put_facts NONE; 
5820  539 

16813  540 
in 
541 

18670  542 
val fix = gen_fix ProofContext.add_fixes; 
543 
val fix_i = gen_fix ProofContext.add_fixes_i; 

5820  544 

16813  545 
end; 
546 

5820  547 

17359  548 
(* assume etc. *) 
5820  549 

16813  550 
local 
551 

17112  552 
fun gen_assume asm prep_att exp args state = 
5820  553 
state 
554 
> assert_forward 

17112  555 
> map_context_result (asm exp (Attrib.map_specs (prep_att (theory_of state)) args)) 
17359  556 
> these_factss [] > #2; 
6932  557 

16813  558 
in 
559 

18728  560 
val assm = gen_assume ProofContext.add_assms Attrib.attribute; 
18670  561 
val assm_i = gen_assume ProofContext.add_assms_i (K I); 
20224
9c40a144ee0e
moved basic assumption operations from structure ProofContext to Assumption;
wenzelm
parents:
20208
diff
changeset

562 
val assume = assm Assumption.assume_export; 
9c40a144ee0e
moved basic assumption operations from structure ProofContext to Assumption;
wenzelm
parents:
20208
diff
changeset

563 
val assume_i = assm_i Assumption.assume_export; 
9c40a144ee0e
moved basic assumption operations from structure ProofContext to Assumption;
wenzelm
parents:
20208
diff
changeset

564 
val presume = assm Assumption.presume_export; 
9c40a144ee0e
moved basic assumption operations from structure ProofContext to Assumption;
wenzelm
parents:
20208
diff
changeset

565 
val presume_i = assm_i Assumption.presume_export; 
5820  566 

16813  567 
end; 
568 

7271  569 

17359  570 
(* def *) 
11891  571 

16813  572 
local 
573 

20913  574 
fun gen_def prep_att prep_vars prep_binds args state = 
11891  575 
let 
576 
val _ = assert_forward state; 

17112  577 
val thy = theory_of state; 
20913  578 
val ctxt = context_of state; 
11891  579 

20913  580 
val (raw_name_atts, (raw_vars, raw_rhss)) = args > split_list > split_list; 
581 
val name_atts = map (apsnd (map (prep_att thy))) raw_name_atts; 

11891  582 
in 
20913  583 
state 
584 
> map_context_result (prep_vars (map (fn (x, mx) => (x, NONE, mx)) raw_vars)) 

585 
>> map (fn (x, _, mx) => (x, mx)) 

586 
> (fn vars => 

587 
map_context_result (prep_binds false (map swap raw_rhss)) 

588 
#> (fn rhss => map_context_result (LocalDefs.add_defs (vars ~~ (name_atts ~~ rhss))))) 

589 
> (put_facts o SOME o map (#2 o #2)) 

11891  590 
end; 
591 

16813  592 
in 
593 

20913  594 
val def = gen_def Attrib.attribute ProofContext.read_vars ProofContext.match_bind; 
595 
val def_i = gen_def (K I) ProofContext.cert_vars ProofContext.match_bind_i; 

11891  596 

16813  597 
end; 
598 

11891  599 

8374  600 

17112  601 
(** facts **) 
5820  602 

17359  603 
(* chain *) 
5820  604 

24011  605 
fun clean_facts ctxt = 
24050  606 
put_facts (SOME (filter_out Thm.is_dummy (the_facts ctxt))) ctxt; 
24011  607 

17359  608 
val chain = 
609 
assert_forward 

24011  610 
#> clean_facts 
17359  611 
#> enter_chain; 
5820  612 

17359  613 
fun chain_facts facts = 
614 
put_facts (SOME facts) 

615 
#> chain; 

5820  616 

617 

17359  618 
(* note etc. *) 
17112  619 

28083
103d9282a946
explicit type Name.binding for higherspecification elements;
wenzelm
parents:
26922
diff
changeset

620 
fun no_binding args = map (pair (Name.no_binding, [])) args; 
17112  621 

622 
local 

623 

17359  624 
fun gen_thmss note_ctxt more_facts opt_chain opt_result prep_atts args state = 
17112  625 
state 
626 
> assert_forward 

627 
> map_context_result (note_ctxt (Attrib.map_facts (prep_atts (theory_of state)) args)) 

628 
> these_factss (more_facts state) 

17359  629 
> opt_chain 
630 
> opt_result; 

17112  631 

632 
in 

633 

21442  634 
val note_thmss = gen_thmss (ProofContext.note_thmss "") (K []) I #2 Attrib.attribute; 
635 
val note_thmss_i = gen_thmss (ProofContext.note_thmss_i "") (K []) I #2 (K I); 

17112  636 

637 
val from_thmss = 

21442  638 
gen_thmss (ProofContext.note_thmss "") (K []) chain #2 Attrib.attribute o no_binding; 
639 
val from_thmss_i = gen_thmss (ProofContext.note_thmss_i "") (K []) chain #2 (K I) o no_binding; 

17112  640 

641 
val with_thmss = 

21442  642 
gen_thmss (ProofContext.note_thmss "") the_facts chain #2 Attrib.attribute o no_binding; 
643 
val with_thmss_i = gen_thmss (ProofContext.note_thmss_i "") the_facts chain #2 (K I) o no_binding; 

17359  644 

18808  645 
val local_results = 
21442  646 
gen_thmss (ProofContext.note_thmss_i "") (K []) I I (K I) o map (apsnd Thm.simple_fact); 
17359  647 

28083
103d9282a946
explicit type Name.binding for higherspecification elements;
wenzelm
parents:
26922
diff
changeset

648 
fun get_thmss state srcs = the_facts (note_thmss [((Name.no_binding, []), srcs)] state); 
17112  649 

650 
end; 

651 

652 

18548  653 
(* using/unfolding *) 
17112  654 

655 
local 

656 

18548  657 
fun gen_using f g note prep_atts args state = 
17112  658 
state 
659 
> assert_backward 

21442  660 
> map_context_result 
661 
(note "" (Attrib.map_facts (prep_atts (theory_of state)) (no_binding args))) 

18843  662 
> (fn (named_facts, state') => 
24556  663 
state' > map_goal I (fn (statement, _, using, goal, before_qed, after_qed) => 
18843  664 
let 
665 
val ctxt = context_of state'; 

19482
9f11af8f7ef9
tuned basic list operators (flat, maps, map_filter);
wenzelm
parents:
19475
diff
changeset

666 
val ths = maps snd named_facts; 
24556  667 
in (statement, [], f ctxt ths using, g ctxt ths goal, before_qed, after_qed) end)); 
18548  668 

24050  669 
fun append_using _ ths using = using @ filter_out Thm.is_dummy ths; 
18878  670 
fun unfold_using ctxt ths = map (LocalDefs.unfold ctxt ths); 
671 
val unfold_goals = LocalDefs.unfold_goals; 

17112  672 

673 
in 

674 

18843  675 
val using = gen_using append_using (K (K I)) ProofContext.note_thmss Attrib.attribute; 
676 
val using_i = gen_using append_using (K (K I)) ProofContext.note_thmss_i (K I); 

18826  677 
val unfolding = gen_using unfold_using unfold_goals ProofContext.note_thmss Attrib.attribute; 
678 
val unfolding_i = gen_using unfold_using unfold_goals ProofContext.note_thmss_i (K I); 

17112  679 

680 
end; 

681 

682 

683 
(* case *) 

684 

685 
local 

686 

687 
fun gen_invoke_case prep_att (name, xs, raw_atts) state = 

688 
let 

689 
val atts = map (prep_att (theory_of state)) raw_atts; 

19078  690 
val (asms, state') = state > map_context_result (fn ctxt => 
691 
ctxt > ProofContext.apply_case (ProofContext.get_case ctxt name xs)); 

28083
103d9282a946
explicit type Name.binding for higherspecification elements;
wenzelm
parents:
26922
diff
changeset

692 
val assumptions = asms > map (fn (a, ts) => ((Name.binding a, atts), map (rpair []) ts)); 
17112  693 
in 
694 
state' 

17359  695 
> map_context (ProofContext.qualified_names #> ProofContext.no_base_names) 
17112  696 
> assume_i assumptions 
17976  697 
> add_binds_i AutoBind.no_facts 
17112  698 
> map_context (ProofContext.restore_naming (context_of state)) 
28083
103d9282a946
explicit type Name.binding for higherspecification elements;
wenzelm
parents:
26922
diff
changeset

699 
> `the_facts > (fn thms => note_thmss_i [((Name.binding name, []), [(thms, [])])]) 
17112  700 
end; 
701 

702 
in 

703 

18728  704 
val invoke_case = gen_invoke_case Attrib.attribute; 
17112  705 
val invoke_case_i = gen_invoke_case (K I); 
706 

707 
end; 

708 

709 

710 

17359  711 
(** proof structure **) 
712 

713 
(* blocks *) 

714 

715 
val begin_block = 

716 
assert_forward 

717 
#> open_block 

718 
#> put_goal NONE 

719 
#> open_block; 

720 

721 
val next_block = 

722 
assert_forward 

723 
#> close_block 

724 
#> open_block 

725 
#> put_goal NONE 

726 
#> put_facts NONE; 

727 

728 
fun end_block state = 

729 
state 

730 
> assert_forward 

731 
> close_block 

732 
> assert_current_goal false 

733 
> close_block 

734 
> export_facts state; 

735 

736 

737 
(* subproofs *) 

738 

739 
fun proof opt_text = 

740 
assert_backward 

17859  741 
#> refine (the_default Method.default_text opt_text) 
17359  742 
#> Seq.map (using_facts [] #> enter_forward); 
743 

23360  744 
fun end_proof bot txt state = 
745 
state 

746 
> assert_forward 

747 
> assert_bottom bot 

748 
> close_block 

749 
> assert_current_goal true 

750 
> using_facts [] 

751 
> `before_qed > (refine o the_default Method.succeed_text) 

25958  752 
> Seq.maps (refine (Method.finish_text txt (Position.thread_data ()))); 
17359  753 

754 

755 
(* unstructured refinement *) 

756 

23360  757 
fun defer i = assert_no_chain #> refine (Method.Basic (K (Method.defer i), Position.none)); 
758 
fun prefer i = assert_no_chain #> refine (Method.Basic (K (Method.prefer i), Position.none)); 

17359  759 

760 
fun apply text = assert_backward #> refine text #> Seq.map (using_facts []); 

761 
fun apply_end text = assert_forward #> refine_end text; 

762 

763 

764 

17112  765 
(** goals **) 
766 

17359  767 
(* generic goals *) 
768 

19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

769 
local 
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

770 

19846  771 
fun implicit_vars dest add props = 
772 
let 

773 
val (explicit_vars, props') = take_prefix (can dest) props >> map dest; 

774 
val vars = rev (subtract (op =) explicit_vars (fold add props [])); 

775 
val _ = 

776 
if null vars then () 

777 
else warning ("Goal statement contains unbound schematic variable(s): " ^ 

778 
commas_quote (map (Term.string_of_vname o fst) vars)); 

779 
in (rev vars, props') end; 

19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

780 

5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

781 
fun refine_terms n = 
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

782 
refine (Method.Basic (K (Method.RAW_METHOD 
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

783 
(K (HEADGOAL (PRECISE_CONJUNCTS n 
23360  784 
(HEADGOAL (CONJUNCTS (ALLGOALS (rtac Drule.termI)))))))), Position.none)) 
19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

785 
#> Seq.hd; 
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

786 

5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

787 
in 
17359  788 

17859  789 
fun generic_goal prepp kind before_qed after_qed raw_propp state = 
5820  790 
let 
17359  791 
val thy = theory_of state; 
23418  792 
val cert = Thm.cterm_of thy; 
17359  793 
val chaining = can assert_chain state; 
25958  794 
val pos = Position.thread_data (); 
17359  795 

796 
val ((propss, after_ctxt), goal_state) = 

5936  797 
state 
798 
> assert_forward_or_chain 

799 
> enter_forward 

17359  800 
> open_block 
17859  801 
> map_context_result (fn ctxt => swap (prepp (ctxt, raw_propp))); 
19482
9f11af8f7ef9
tuned basic list operators (flat, maps, map_filter);
wenzelm
parents:
19475
diff
changeset

802 
val props = flat propss; 
15703  803 

19846  804 
val (_, props') = 
805 
implicit_vars (dest_TVar o Logic.dest_type o Logic.dest_term) Term.add_tvars props; 

806 
val (vars, _) = implicit_vars (dest_Var o Logic.dest_term) Term.add_vars props'; 

19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

807 

5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

808 
val propss' = map (Logic.mk_term o Var) vars :: propss; 
23418  809 
val goal_propss = filter_out null propss'; 
28410  810 
val goal = cert (Logic.mk_conjunction_balanced (map Logic.mk_conjunction_balanced goal_propss)); 
811 
val statement = ((kind, pos), propss', goal); 

18124  812 
val after_qed' = after_qed >> (fn after_local => 
813 
fn results => map_context after_ctxt #> after_local results); 

5820  814 
in 
17359  815 
goal_state 
21727  816 
> map_context (init_context #> Variable.set_body true) 
28410  817 
> put_goal (SOME (make_goal (statement, [], [], Goal.init goal, before_qed, after_qed'))) 
17359  818 
> map_context (ProofContext.auto_bind_goal props) 
21565  819 
> chaining ? (`the_facts #> using_facts) 
17359  820 
> put_facts NONE 
821 
> open_block 

822 
> put_goal NONE 

5820  823 
> enter_backward 
23418  824 
> not (null vars) ? refine_terms (length goal_propss) 
23360  825 
> null props ? (refine (Method.Basic (Method.assumption, Position.none)) #> Seq.hd) 
5820  826 
end; 
827 

17359  828 
fun generic_qed state = 
12503  829 
let 
25958  830 
val (goal_ctxt, {statement, goal, after_qed, ...}) = current_goal state; 
8617
33e2bd53aec3
support HindleyMilner polymorphisms in binds and facts;
wenzelm
parents:
8582
diff
changeset

831 
val outer_state = state > close_block; 
33e2bd53aec3
support HindleyMilner polymorphisms in binds and facts;
wenzelm
parents:
8582
diff
changeset

832 
val outer_ctxt = context_of outer_state; 
33e2bd53aec3
support HindleyMilner polymorphisms in binds and facts;
wenzelm
parents:
8582
diff
changeset

833 

28410  834 
val ((_, pos), stmt, _) = statement; 
18503
841137f20307
goal/qed: proper treatment of two levels of conjunctions;
wenzelm
parents:
18475
diff
changeset

835 
val props = 
19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

836 
flat (tl stmt) 
19915  837 
> Variable.exportT_terms goal_ctxt outer_ctxt; 
17359  838 
val results = 
19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

839 
tl (conclude_goal state goal stmt) 
20309  840 
> burrow (ProofContext.export goal_ctxt outer_ctxt); 
25958  841 

842 
val (after_local, after_global) = after_qed; 

843 
fun after_local' x y = Position.setmp_thread_data_seq pos (fn () => after_local x y) (); 

844 
fun after_global' x y = Position.setmp_thread_data pos (fn () => after_global x y) (); 

17359  845 
in 
846 
outer_state 

847 
> map_context (ProofContext.auto_bind_facts props) 

25958  848 
> pair ((after_local', after_global'), results) 
17359  849 
end; 
850 

19774
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

851 
end; 
5fe7731d0836
allow nontrivial schematic goals (via embedded term vars);
wenzelm
parents:
19585
diff
changeset

852 

9469  853 

17359  854 
(* local goals *) 
855 

17859  856 
fun local_goal print_results prep_att prepp kind before_qed after_qed stmt state = 
17359  857 
let 
21362
3a2ab1dce297
simplified Proof.theorem(_i) interface  removed target support;
wenzelm
parents:
21274
diff
changeset

858 
val thy = theory_of state; 
3a2ab1dce297
simplified Proof.theorem(_i) interface  removed target support;
wenzelm
parents:
21274
diff
changeset

859 
val ((names, attss), propp) = 
3a2ab1dce297
simplified Proof.theorem(_i) interface  removed target support;
wenzelm
parents:
21274
diff
changeset

860 
Attrib.map_specs (prep_att thy) stmt > split_list >> split_list; 
17359  861 

18124  862 
fun after_qed' results = 
18808  863 
local_results ((names ~~ attss) ~~ results) 
17359  864 
#> (fn res => tap (fn st => print_results (context_of st) ((kind, ""), res) : unit)) 
18124  865 
#> after_qed results; 
5820  866 
in 
17359  867 
state 
21362
3a2ab1dce297
simplified Proof.theorem(_i) interface  removed target support;
wenzelm
parents:
21274
diff
changeset

868 
> generic_goal prepp kind before_qed (after_qed', K I) propp 
19900
21a99d88d925
ProofContext: moved variable operations to struct Variable;
wenzelm
parents:
19862
diff
changeset

869 
> tap (Variable.warn_extra_tfrees (context_of state) o context_of) 
5820  870 
end; 
871 

17359  872 
fun local_qed txt = 
20309  873 
end_proof false txt #> 
874 
Seq.maps (generic_qed #> (fn ((after_qed, _), results) => after_qed results)); 

5820  875 

876 

17359  877 
(* global goals *) 
878 

21442  879 
fun global_goal prepp before_qed after_qed propp ctxt = 
21362
3a2ab1dce297
simplified Proof.theorem(_i) interface  removed target support;
wenzelm
parents:
21274
diff
changeset

880 
init ctxt 
21442  881 
> generic_goal (prepp #> ProofContext.auto_fixes) "" 
21362
3a2ab1dce297
simplified Proof.theorem(_i) interface  removed target support;
wenzelm
parents:
21274
diff
changeset

882 
before_qed (K Seq.single, after_qed) propp; 
17359  883 

21362
3a2ab1dce297
simplified Proof.theorem(_i) interface  removed target support;
wenzelm
parents:
21274
diff
changeset

884 
val theorem = global_goal ProofContext.bind_propp_schematic; 
3a2ab1dce297
simplified Proof.theorem(_i) interface  removed target support;
wenzelm
parents:
21274
diff
changeset

885 
val theorem_i = global_goal ProofContext.bind_propp_schematic_i; 
12065  886 

18678  887 
fun check_result msg sq = 
17112  888 
(case Seq.pull sq of 
18678  889 
NONE => error msg 
19475  890 
 SOME (s', sq') => Seq.cons s' sq'); 
17112  891 

17359  892 
fun global_qeds txt = 
893 
end_proof true txt 

20309  894 
#> Seq.map (generic_qed #> (fn (((_, after_qed), results), state) => 
20363
f34c5dbe74d5
global goals/qeds: after_qed operates on Proof.context (potentially local_theory);
wenzelm
parents:
20341
diff
changeset

895 
after_qed results (context_of state))) 
17112  896 
> Seq.DETERM; (*backtracking may destroy theory!*) 
897 

18678  898 
fun global_qed txt = 
899 
global_qeds txt 

900 
#> check_result "Failed to finish proof" 

901 
#> Seq.hd; 

12959  902 

5820  903 

17359  904 
(* concluding steps *) 
17112  905 

17359  906 
fun local_terminal_proof (text, opt_text) = 
907 
proof (SOME text) #> Seq.maps (local_qed (opt_text, true)); 

17112  908 

909 
val local_default_proof = local_terminal_proof (Method.default_text, NONE); 

910 
val local_immediate_proof = local_terminal_proof (Method.this_text, NONE); 

17359  911 
val local_done_proof = proof (SOME Method.done_text) #> Seq.maps (local_qed (NONE, false)); 
912 
fun local_skip_proof int = local_terminal_proof (Method.sorry_text int, NONE); 

17112  913 

18678  914 
fun global_term_proof immed (text, opt_text) = 
915 
proof (SOME text) 

916 
#> check_result "Terminal proof method failed" 

917 
#> Seq.maps (global_qeds (opt_text, immed)) 

918 
#> check_result "Failed to finish proof (after successful terminal method)" 

919 
#> Seq.hd; 

17112  920 

921 
val global_terminal_proof = global_term_proof true; 

922 
val global_default_proof = global_terminal_proof (Method.default_text, NONE); 

923 
val global_immediate_proof = global_terminal_proof (Method.this_text, NONE); 

924 
val global_done_proof = global_term_proof false (Method.done_text, NONE); 

17359  925 
fun global_skip_proof int = global_terminal_proof (Method.sorry_text int, NONE); 
5820  926 

6896  927 

17359  928 
(* common goal statements *) 
929 

930 
local 

931 

17859  932 
fun gen_have prep_att prepp before_qed after_qed stmt int = 
933 
local_goal (ProofDisplay.print_results int) prep_att prepp "have" before_qed after_qed stmt; 

6896  934 

17859  935 
fun gen_show prep_att prepp before_qed after_qed stmt int state = 
17359  936 
let 
937 
val testing = ref false; 

938 
val rule = ref (NONE: thm option); 

939 
fun fail_msg ctxt = 

940 
"Local statement will fail to solve any pending goal" :: 

941 
(case ! rule of NONE => []  SOME th => [ProofDisplay.string_of_rule ctxt "Failed" th]) 

942 
> cat_lines; 

6896  943 

17359  944 
fun print_results ctxt res = 
945 
if ! testing then () else ProofDisplay.print_results int ctxt res; 

946 
fun print_rule ctxt th = 

947 
if ! testing then rule := SOME th 

948 
else if int then priority (ProofDisplay.string_of_rule ctxt "Successful" th) 

949 
else (); 

950 
val test_proof = 

951 
(Seq.pull oo local_skip_proof) true 

28289  952 
> setmp_noncritical testing true 
23963
c2ee97a963db
moved exception capture/release to structure Exn;
wenzelm
parents:
23806
diff
changeset

953 
> Exn.capture; 
6896  954 

18124  955 
fun after_qed' results = 
19482
9f11af8f7ef9
tuned basic list operators (flat, maps, map_filter);
wenzelm
parents:
19475
diff
changeset

956 
refine_goals print_rule (context_of state) (flat results) 
18124  957 
#> Seq.maps (after_qed results); 
17359  958 
in 
959 
state 

17859  960 
> local_goal print_results prep_att prepp "show" before_qed after_qed' stmt 
21565  961 
> int ? (fn goal_state => 
17359  962 
(case test_proof goal_state of 
23963
c2ee97a963db
moved exception capture/release to structure Exn;
wenzelm
parents:
23806
diff
changeset

963 
Exn.Result (SOME _) => goal_state 
c2ee97a963db
moved exception capture/release to structure Exn;
wenzelm
parents:
23806
diff
changeset

964 
 Exn.Result NONE => error (fail_msg (context_of goal_state)) 
28443  965 
 Exn.Exn Exn.Interrupt => raise Exn.Interrupt 
28458  966 
 Exn.Exn exn => raise Exn.EXCEPTIONS ([exn, ERROR (fail_msg (context_of goal_state))]))) 
17359  967 
end; 
968 

969 
in 

970 

18728  971 
val have = gen_have Attrib.attribute ProofContext.bind_propp; 
17359  972 
val have_i = gen_have (K I) ProofContext.bind_propp_i; 
18728  973 
val show = gen_show Attrib.attribute ProofContext.bind_propp; 
17359  974 
val show_i = gen_show (K I) ProofContext.bind_propp_i; 
6896  975 

5820  976 
end; 
17359  977 

28410  978 

28452  979 
(* fork global proofs *) 
28410  980 

981 
fun is_initial state = 

982 
(case try find_goal state of 

983 
NONE => false 

984 
 SOME (_, (_, {statement = (_, _, prop), goal, ...})) => Thm.eq_thm_prop (Goal.init prop, goal)); 

985 

28452  986 
fun is_relevant state = 
987 
can (assert_bottom false) state orelse 

988 
can assert_forward state orelse 

989 
not (is_initial state) orelse 

990 
schematic_goal state; 

28410  991 

28446
a01de3b3fa2e
renamed promise to future, tuned related interfaces;
wenzelm
parents:
28443
diff
changeset

992 
fun future_proof make_proof state = 
28410  993 
let 
28452  994 
val _ = is_relevant state andalso error "Cannot fork relevant proof"; 
28410  995 

996 
val (goal_ctxt, (_, goal)) = find_goal state; 

997 
val {statement as (kind, propss, cprop), messages, using, goal, before_qed, after_qed} = goal; 

998 
val prop = Thm.term_of cprop; 

28450
504c4edead13
future_proof: protect conclusion of deferred proof state;
wenzelm
parents:
28446
diff
changeset

999 
val cprop_protected = #2 (Thm.dest_implies (Thm.cprop_of goal)); 
28410  1000 

28450
504c4edead13
future_proof: protect conclusion of deferred proof state;
wenzelm
parents:
28446
diff
changeset

1001 
val statement' = (kind, [[], [Thm.term_of cprop_protected]], cprop_protected); 
504c4edead13
future_proof: protect conclusion of deferred proof state;
wenzelm
parents:
28446
diff
changeset

1002 
val goal' = Thm.adjust_maxidx_thm ~1 (Drule.protectI RS Goal.init cprop_protected); 
504c4edead13
future_proof: protect conclusion of deferred proof state;
wenzelm
parents:
28446
diff
changeset

1003 
fun after_qed' [[th]] = ProofContext.put_thms false (AutoBind.thisN, SOME [Goal.conclude th]); 
28410  1004 
val this_name = ProofContext.full_name (ProofContext.reset_naming goal_ctxt) AutoBind.thisN; 
1005 

1006 
fun make_result () = state 

28452  1007 
> map_contexts (Variable.auto_fixes prop) 
28450
504c4edead13
future_proof: protect conclusion of deferred proof state;
wenzelm
parents:
28446
diff
changeset

1008 
> map_goal I (K (statement', messages, using, goal', before_qed, (#1 after_qed, after_qed'))) 
28410  1009 
> make_proof 
1010 
> (fn result_ctxt => ProofContext.get_fact_single result_ctxt (Facts.named this_name)); 

28446
a01de3b3fa2e
renamed promise to future, tuned related interfaces;
wenzelm
parents:
28443
diff
changeset

1011 
val finished_goal = Goal.protect (Goal.future_result goal_ctxt make_result prop); 
28410  1012 
in 
1013 
state 

1014 
> map_goal I (K (statement, messages, using, finished_goal, NONE, after_qed)) 

1015 
> global_done_proof 

1016 
end; 

1017 

17359  1018 
end; 