author  wenzelm 
Wed, 14 May 2008 14:43:37 +0200  
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parent 26623  81547c8d51f8 
child 26957  e3f04fdd994d 
permissions  rwrr 
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(* Title: Pure/context.ML 
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ID: $Id$ 

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Author: Markus Wenzel, TU Muenchen 

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Generic theory contexts with unique identity, arbitrarily typed data, 
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monotonic development graph and history support. Generic proof 
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contexts with arbitrarily typed data. 
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*) 
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signature BASIC_CONTEXT = 

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sig 

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type theory 
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type theory_ref 
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exception THEORY of string * theory list 
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end; 
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signature CONTEXT = 

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sig 

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include BASIC_CONTEXT 

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(*theory context*) 
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val theory_name: theory > string 
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val parents_of: theory > theory list 
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val ancestors_of: theory > theory list 
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val is_stale: theory > bool 
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val PureN: string 
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val CPureN: string 
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val is_draft: theory > bool 
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val exists_name: string > theory > bool 
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val names_of: theory > string list 
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val pretty_thy: theory > Pretty.T 
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val string_of_thy: theory > string 
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val pprint_thy: theory > pprint_args > unit 
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val pretty_abbrev_thy: theory > Pretty.T 
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val str_of_thy: theory > string 
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val deref: theory_ref > theory 
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val check_thy: theory > theory_ref 
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val eq_thy: theory * theory > bool 
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val subthy: theory * theory > bool 
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val joinable: theory * theory > bool 
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val merge: theory * theory > theory 
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val merge_refs: theory_ref * theory_ref > theory_ref 
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val copy_thy: theory > theory 
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val checkpoint_thy: theory > theory 
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val finish_thy: theory > theory 
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val begin_thy: (theory > Pretty.pp) > string > theory list > theory 
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(*proof context*) 
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type proof 

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val theory_of_proof: proof > theory 

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val transfer_proof: theory > proof > proof 
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val init_proof: theory > proof 
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(*generic context*) 

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datatype generic = Theory of theory  Proof of proof 
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val cases: (theory > 'a) > (proof > 'a) > generic > 'a 

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val mapping: (theory > theory) > (proof > proof) > generic > generic 
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val mapping_result: (theory > 'a * theory) > (proof > 'a * proof) > generic > 'a * generic 
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val the_theory: generic > theory 
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val the_proof: generic > proof 

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val map_theory: (theory > theory) > generic > generic 
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val map_proof: (proof > proof) > generic > generic 

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val map_theory_result: (theory > 'a * theory) > generic > 'a * generic 
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val map_proof_result: (proof > 'a * proof) > generic > 'a * generic 

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val theory_map: (generic > generic) > theory > theory 
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val proof_map: (generic > generic) > proof > proof 

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val theory_of: generic > theory (*total*) 
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val proof_of: generic > proof (*total*) 

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(*thread data*) 
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val thread_data: unit > generic option 
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val the_thread_data: unit > generic 
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val set_thread_data: generic option > unit 
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val setmp_thread_data: generic option > ('a > 'b) > 'a > 'b 
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val >> : (generic > generic) > unit 
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val >>> : (generic > 'a * generic) > 'a 

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end; 
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signature PRIVATE_CONTEXT = 
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sig 
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include CONTEXT 
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structure TheoryData: 
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sig 
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val declare: Object.T > (Object.T > Object.T) > (Object.T > Object.T) > 
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(Pretty.pp > Object.T * Object.T > Object.T) > serial 
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val get: serial > (Object.T > 'a) > theory > 'a 
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val put: serial > ('a > Object.T) > 'a > theory > theory 
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end 
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structure ProofData: 
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sig 

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val declare: (theory > Object.T) > serial 
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val get: serial > (Object.T > 'a) > proof > 'a 
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val put: serial > ('a > Object.T) > 'a > proof > proof 

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end 

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end; 
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structure Context: PRIVATE_CONTEXT = 
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struct 
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(*** theory context ***) 
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(** theory data **) 
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(* data kinds and access methods *) 
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(*private copy avoids potential conflict of table exceptions*) 
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structure Datatab = TableFun(type key = int val ord = int_ord); 
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local 
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type kind = 
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{empty: Object.T, 
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copy: Object.T > Object.T, 
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extend: Object.T > Object.T, 
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merge: Pretty.pp > Object.T * Object.T > Object.T}; 
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val kinds = ref (Datatab.empty: kind Datatab.table); 
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fun invoke f k = 
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(case Datatab.lookup (! kinds) k of 
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SOME kind => f kind 
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 NONE => sys_error "Invalid theory data identifier"); 
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in 
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fun invoke_empty k = invoke (K o #empty) k (); 
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val invoke_copy = invoke #copy; 
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val invoke_extend = invoke #extend; 
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fun invoke_merge pp = invoke (fn kind => #merge kind pp); 
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fun declare_theory_data empty copy extend merge = 
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let 
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val k = serial (); 
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val kind = {empty = empty, copy = copy, extend = extend, merge = merge}; 
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val _ = CRITICAL (fn () => change kinds (Datatab.update (k, kind))); 
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in k end; 
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val copy_data = Datatab.map' invoke_copy; 
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val extend_data = Datatab.map' invoke_extend; 
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fun merge_data pp = Datatab.join (invoke_merge pp) o pairself extend_data; 
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end; 
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(** datatype theory **) 
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datatype theory = 
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Theory of 
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(*identity*) 
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{self: theory ref option, (*dynamic self reference  follows theory changes*) 
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id: serial * string, (*identifier of this theory*) 
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ids: string Inttab.table, (*identifiers of ancestors*) 
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iids: string Inttab.table} * (*identifiers of intermediate checkpoints*) 
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(*data*) 
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Object.T Datatab.table * 
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(*ancestry*) 
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{parents: theory list, (*immediate predecessors*) 
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ancestors: theory list} * (*all predecessors*) 
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(*history*) 
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{name: string, (*prospective name of finished theory*) 
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version: int, (*checkpoint counter*) 
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intermediates: theory list}; (*intermediate checkpoints*) 
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exception THEORY of string * theory list; 
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fun rep_theory (Theory args) = args; 
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val identity_of = #1 o rep_theory; 
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val data_of = #2 o rep_theory; 
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val ancestry_of = #3 o rep_theory; 
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val history_of = #4 o rep_theory; 
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fun make_identity self id ids iids = {self = self, id = id, ids = ids, iids = iids}; 
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fun make_ancestry parents ancestors = {parents = parents, ancestors = ancestors}; 
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fun make_history name vers ints = {name = name, version = vers, intermediates = ints}; 
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val the_self = the o #self o identity_of; 
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val parents_of = #parents o ancestry_of; 
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val ancestors_of = #ancestors o ancestry_of; 
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val theory_name = #name o history_of; 
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179 

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(* staleness *) 
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16533  182 
fun eq_id ((i: int, _), (j, _)) = (i = j); 
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fun is_stale 
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(Theory ({self = SOME (ref (Theory ({id = id', ...}, _, _, _))), id, ...}, _, _, _)) = 
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not (eq_id (id, id')) 
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 is_stale (Theory ({self = NONE, ...}, _, _, _)) = true; 
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188 

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fun vitalize (thy as Theory ({self = SOME r, ...}, _, _, _)) = (r := thy; thy) 
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 vitalize (thy as Theory ({self = NONE, id, ids, iids}, data, ancestry, history)) = 
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let 
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val r = ref thy; 
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val thy' = Theory (make_identity (SOME r) id ids iids, data, ancestry, history); 
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in r := thy'; thy' end; 
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196 

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(* names *) 
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val PureN = "Pure"; 
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val CPureN = "CPure"; 
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val draftN = "#"; 
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fun draft_id (_, name) = (name = draftN); 
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val is_draft = draft_id o #id o identity_of; 
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20821  206 
fun exists_name name (thy as Theory ({id, ids, iids, ...}, _, _, _)) = 
207 
name = theory_name thy orelse 

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name = #2 id orelse 
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Inttab.exists (equal name o #2) ids orelse 
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Inttab.exists (equal name o #2) iids; 
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fun names_of (Theory ({id, ids, ...}, _, _, _)) = 
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rev (#2 id :: Inttab.fold (cons o #2) ids []); 
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214 

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fun pretty_thy thy = 
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Pretty.str_list "{" "}" (names_of thy @ (if is_stale thy then ["!"] else [])); 
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217 

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val string_of_thy = Pretty.string_of o pretty_thy; 
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val pprint_thy = Pretty.pprint o pretty_thy; 
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220 

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fun pretty_abbrev_thy thy = 
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let 
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val names = names_of thy; 
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val n = length names; 
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val abbrev = if n > 5 then "..." :: List.drop (names, n  5) else names; 
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in Pretty.str_list "{" "}" abbrev end; 
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227 

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val str_of_thy = Pretty.str_of o pretty_abbrev_thy; 
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229 

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230 

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(* theory references *) 
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232 

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(*theory_ref provides a safe way to store dynamic references to a 
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theory in external data structures  a plain theory value would 
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become stale as the self reference moves on*) 
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236 

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datatype theory_ref = TheoryRef of theory ref; 
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238 

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fun deref (TheoryRef (ref thy)) = thy; 
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240 

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fun check_thy thy = (*threadsafe version*) 
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let val thy_ref = TheoryRef (the_self thy) in 
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if is_stale thy then error ("Stale theory encountered:\n" ^ string_of_thy thy) 
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else thy_ref 
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end; 
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246 

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247 

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(* consistency *) 
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fun check_ins id ids = 
16894  251 
if draft_id id orelse Inttab.defined ids (#1 id) then ids 
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else if Inttab.exists (equal (#2 id) o #2) ids then 
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error ("Different versions of theory component " ^ quote (#2 id)) 
17412  254 
else Inttab.update id ids; 
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255 

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fun check_insert intermediate id (ids, iids) = 
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let val ids' = check_ins id ids and iids' = check_ins id iids 
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in if intermediate then (ids, iids') else (ids', iids) end; 
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259 

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fun check_merge 
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(Theory ({id = id1, ids = ids1, iids = iids1, ...}, _, _, history1)) 
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(Theory ({id = id2, ids = ids2, iids = iids2, ...}, _, _, history2)) = 
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(Inttab.fold check_ins ids2 ids1, Inttab.fold check_ins iids2 iids1) 
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> check_insert (#version history1 > 0) id1 
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> check_insert (#version history2 > 0) id2; 
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16533  268 
(* equality and inclusion *) 
269 

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val eq_thy = eq_id o pairself (#id o identity_of); 
16533  271 

272 
fun proper_subthy 

16719  273 
(Theory ({id = (i, _), ...}, _, _, _), Theory ({ids, iids, ...}, _, _, _)) = 
16894  274 
Inttab.defined ids i orelse Inttab.defined iids i; 
16533  275 

276 
fun subthy thys = eq_thy thys orelse proper_subthy thys; 

277 

16594  278 
fun joinable (thy1, thy2) = subthy (thy1, thy2) orelse subthy (thy2, thy1); 
279 

16533  280 

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(* trivial merge *) 
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282 

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fun merge (thy1, thy2) = 
16719  284 
if eq_thy (thy1, thy2) then thy1 
285 
else if proper_subthy (thy2, thy1) then thy1 

286 
else if proper_subthy (thy1, thy2) then thy2 

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else (check_merge thy1 thy2; 
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error (cat_lines ["Attempt to perform nontrivial merge of theories:", 
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str_of_thy thy1, str_of_thy thy2])); 
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290 

16719  291 
fun merge_refs (ref1, ref2) = 
292 
if ref1 = ref2 then ref1 

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else check_thy (merge (deref ref1, deref ref2)); 
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295 

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296 

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(** build theories **) 
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(* primitives *) 
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300 

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fun create_thy name self id ids iids data ancestry history = 
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let 
17756  303 
val {version, name = _, intermediates = _} = history; 
304 
val intermediate = version > 0; 

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val (ids', iids') = check_insert intermediate id (ids, iids); 
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val id' = (serial (), name); 
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val _ = check_insert intermediate id' (ids', iids'); 
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val identity' = make_identity self id' ids' iids'; 
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in vitalize (Theory (identity', data, ancestry, history)) end; 
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24369  311 
fun change_thy name f thy = 
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let 
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val Theory ({self, id, ids, iids}, data, ancestry, history) = thy; 
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val (self', data', ancestry') = 
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if is_draft thy then (self, data, ancestry) (*destructive change!*) 
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else if #version history > 0 
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then (NONE, copy_data data, ancestry) 
24369  318 
else (NONE, extend_data data, make_ancestry [thy] (thy :: #ancestors ancestry)); 
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val data'' = f data'; 
24369  320 
val thy' = NAMED_CRITICAL "theory" (fn () => 
321 
(check_thy thy; create_thy name self' id ids iids data'' ancestry' history)); 

322 
in thy' end; 

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323 

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fun name_thy name = change_thy name I; 
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val modify_thy = change_thy draftN; 
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val extend_thy = modify_thy I; 
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327 

24369  328 
fun copy_thy thy = 
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let 
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val Theory ({id, ids, iids, ...}, data, ancestry, history) = thy; 
24369  331 
val data' = copy_data data; 
332 
val thy' = NAMED_CRITICAL "theory" (fn () => 

333 
(check_thy thy; create_thy draftN NONE id ids iids data' ancestry history)); 

334 
in thy' end; 

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335 

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val pre_pure_thy = create_thy draftN NONE (serial (), draftN) Inttab.empty Inttab.empty 
26428  337 
Datatab.empty (make_ancestry [] []) (make_history PureN 0 []); 
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338 

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339 

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340 
(* named theory nodes *) 
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341 

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342 
fun merge_thys pp (thy1, thy2) = 
16533  343 
if exists_name CPureN thy1 <> exists_name CPureN thy2 then 
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344 
error "Cannot merge Pure and CPure developments" 
24369  345 
else 
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346 
let 
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347 
val (ids, iids) = check_merge thy1 thy2; 
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348 
val data = merge_data (pp thy1) (data_of thy1, data_of thy2); 
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349 
val ancestry = make_ancestry [] []; 
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350 
val history = make_history "" 0 []; 
24369  351 
val thy' = NAMED_CRITICAL "theory" (fn () => 
352 
(check_thy thy1; check_thy thy2; 

353 
create_thy draftN NONE (serial (), draftN) ids iids data ancestry history)) 

354 
in thy' end; 

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355 

16533  356 
fun maximal_thys thys = 
357 
thys > filter (fn thy => not (exists (fn thy' => proper_subthy (thy, thy')) thys)); 

358 

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359 
fun begin_thy pp name imports = 
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360 
if name = draftN then error ("Illegal theory name: " ^ quote draftN) 
24369  361 
else 
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362 
let 
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363 
val parents = maximal_thys (distinct eq_thy imports); 
22603  364 
val ancestors = distinct eq_thy (parents @ maps ancestors_of parents); 
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365 
val Theory ({id, ids, iids, ...}, data, _, _) = 
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366 
(case parents of 
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367 
[] => error "No parent theories" 
16533  368 
 [thy] => extend_thy thy 
369 
 thy :: thys => Library.foldl (merge_thys pp) (thy, thys)); 

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370 
val ancestry = make_ancestry parents ancestors; 
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371 
val history = make_history name 0 []; 
24369  372 
val thy' = NAMED_CRITICAL "theory" (fn () => 
373 
(map check_thy imports; create_thy draftN NONE id ids iids data ancestry history)); 

374 
in thy' end; 

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375 

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376 

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377 
(* undoable checkpoints *) 
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378 

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379 
fun checkpoint_thy thy = 
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380 
if not (is_draft thy) then thy 
24369  381 
else 
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382 
let 
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383 
val {name, version, intermediates} = history_of thy; 
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384 
val thy' as Theory (identity', data', ancestry', _) = 
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385 
name_thy (name ^ ":" ^ string_of_int version) thy; 
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386 
val history' = make_history name (version + 1) (thy' :: intermediates); 
24369  387 
val thy'' = NAMED_CRITICAL "theory" (fn () => 
388 
(check_thy thy'; vitalize (Theory (identity', data', ancestry', history')))); 

389 
in thy'' end; 

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390 

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391 
fun finish_thy thy = NAMED_CRITICAL "theory" (fn () => 
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392 
let 
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393 
val {name, version, intermediates} = history_of thy; 
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394 
val rs = map ((fn TheoryRef r => r) o check_thy) intermediates; 
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395 
val thy' as Theory ({self, id, ids, ...}, data', ancestry', _) = name_thy name thy; 
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396 
val identity' = make_identity self id ids Inttab.empty; 
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397 
val history' = make_history name 0 []; 
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398 
val thy'' = vitalize (Theory (identity', data', ancestry', history')); 
16533  399 
val _ = List.app (fn r => r := thy'') rs; 
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400 
in thy'' end); 
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401 

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402 

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403 
(* theory data *) 
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404 

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405 
structure TheoryData = 
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406 
struct 
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407 

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408 
val declare = declare_theory_data; 
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409 

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410 
fun get k dest thy = 
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411 
dest ((case Datatab.lookup (data_of thy) k of 
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412 
SOME x => x 
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413 
 NONE => invoke_copy k (invoke_empty k))); (*adhoc value*) 
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414 

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415 
fun put k mk x = modify_thy (Datatab.update (k, mk x)); 
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416 

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417 
end; 
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418 

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419 

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420 

16533  421 
(*** proof context ***) 
422 

423 
(* datatype proof *) 

424 

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425 
datatype proof = Prf of Object.T Datatab.table * theory_ref; 
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426 

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427 
fun theory_of_proof (Prf (_, thy_ref)) = deref thy_ref; 
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428 
fun data_of_proof (Prf (data, _)) = data; 
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429 
fun map_prf f (Prf (data, thy_ref)) = Prf (f data, thy_ref); 
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430 

16533  431 

432 
(* proof data kinds *) 

433 

434 
local 

435 

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436 
val kinds = ref (Datatab.empty: (theory > Object.T) Datatab.table); 
16533  437 

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438 
fun invoke_init k = 
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439 
(case Datatab.lookup (! kinds) k of 
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440 
SOME init => init 
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441 
 NONE => sys_error "Invalid proof data identifier"); 
16533  442 

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443 
fun init_data thy = 
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444 
Datatab.map' (fn k => fn _ => invoke_init k thy) (! kinds); 
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445 

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446 
fun init_new_data data thy = 
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447 
Datatab.merge (K true) (data, init_data thy); 
16533  448 

449 
in 

450 

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451 
fun init_proof thy = Prf (init_data thy, check_thy thy); 
16533  452 

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453 
fun transfer_proof thy' (prf as Prf (data, thy_ref)) = 
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454 
let 
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455 
val thy = deref thy_ref; 
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456 
val _ = subthy (thy, thy') orelse error "transfer proof context: not a super theory"; 
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457 
val _ = check_thy thy; 
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458 
val data' = init_new_data data thy'; 
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459 
val thy_ref' = check_thy thy'; 
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460 
in Prf (data', thy_ref') end; 
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461 

16533  462 

463 
structure ProofData = 

464 
struct 

465 

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466 
fun declare init = 
16533  467 
let 
468 
val k = serial (); 

23944  469 
val _ = CRITICAL (fn () => change kinds (Datatab.update (k, init))); 
16533  470 
in k end; 
471 

472 
fun get k dest prf = 

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473 
dest (case Datatab.lookup (data_of_proof prf) k of 
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474 
SOME x => x 
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475 
 NONE => invoke_init k (theory_of_proof prf)); (*adhoc value*) 
16533  476 

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477 
fun put k mk x = map_prf (Datatab.update (k, mk x)); 
16533  478 

479 
end; 

480 

481 
end; 

482 

483 

18632  484 

16533  485 
(*** generic context ***) 
486 

18632  487 
datatype generic = Theory of theory  Proof of proof; 
488 

489 
fun cases f _ (Theory thy) = f thy 

490 
 cases _ g (Proof prf) = g prf; 

16533  491 

19678  492 
fun mapping f g = cases (Theory o f) (Proof o g); 
21660  493 
fun mapping_result f g = cases (apsnd Theory o f) (apsnd Proof o g); 
19678  494 

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495 
val the_theory = cases I (fn _ => error "Illtyped context: theory expected"); 
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496 
val the_proof = cases (fn _ => error "Illtyped context: proof expected") I; 
16533  497 

18731  498 
fun map_theory f = Theory o f o the_theory; 
499 
fun map_proof f = Proof o f o the_proof; 

500 

26486  501 
fun map_theory_result f = apsnd Theory o f o the_theory; 
502 
fun map_proof_result f = apsnd Proof o f o the_proof; 

503 

18731  504 
fun theory_map f = the_theory o f o Theory; 
505 
fun proof_map f = the_proof o f o Proof; 

18665  506 

18632  507 
val theory_of = cases I theory_of_proof; 
508 
val proof_of = cases init_proof I; 

16533  509 

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510 

c138cfd500f7
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511 

26413
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512 
(** thread data **) 
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513 

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514 
local val tag = Universal.tag () : generic option Universal.tag in 
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515 

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516 
fun thread_data () = 
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517 
(case Multithreading.get_data tag of 
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518 
SOME (SOME context) => SOME context 
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519 
 _ => NONE); 
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520 

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521 
fun the_thread_data () = 
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522 
(case thread_data () of 
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523 
SOME context => context 
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524 
 _ => error "Unknown context"); 
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525 

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526 
fun set_thread_data context = Multithreading.put_data (tag, context); 
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527 
fun setmp_thread_data context = Library.setmp_thread_data tag (thread_data ()) context; 
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528 

26428  529 
end; 
530 

531 
fun >>> f = 

532 
let 

26463  533 
val (res, context') = f (the_thread_data ()); 
534 
val _ = set_thread_data (SOME context'); 

26428  535 
in res end; 
536 

26421  537 
nonfix >>; 
26463  538 
fun >> f = >>> (fn context => ((), f context)); 
26413
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539 

26428  540 
val _ = set_thread_data (SOME (Theory pre_pure_thy)); 
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541 

6185  542 
end; 
543 

544 
structure BasicContext: BASIC_CONTEXT = Context; 

545 
open BasicContext; 

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546 

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547 

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548 

16533  549 
(*** typesafe interfaces for data declarations ***) 
550 

551 
(** theory data **) 

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552 

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553 
signature THEORY_DATA_ARGS = 
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554 
sig 
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555 
type T 
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556 
val empty: T 
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557 
val copy: T > T 
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558 
val extend: T > T 
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559 
val merge: Pretty.pp > T * T > T 
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560 
end; 
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561 

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562 
signature THEORY_DATA = 
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563 
sig 
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564 
type T 
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565 
val get: theory > T 
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566 
val put: T > theory > theory 
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567 
val map: (T > T) > theory > theory 
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568 
val init: theory > theory 
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569 
end; 
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570 

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571 
functor TheoryDataFun(Data: THEORY_DATA_ARGS): THEORY_DATA = 
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572 
struct 
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573 

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574 
structure TheoryData = Context.TheoryData; 
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575 

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576 
type T = Data.T; 
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577 
exception Data of T; 
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578 

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579 
val kind = TheoryData.declare 
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580 
(Data Data.empty) 
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581 
(fn Data x => Data (Data.copy x)) 
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582 
(fn Data x => Data (Data.extend x)) 
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583 
(fn pp => fn (Data x1, Data x2) => Data (Data.merge pp (x1, x2))); 
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584 

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585 
val get = TheoryData.get kind (fn Data x => x); 
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586 
val put = TheoryData.put kind Data; 
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587 
fun map f thy = put (f (get thy)) thy; 
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588 

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589 
fun init thy = map I thy; 
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590 

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591 
end; 
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592 

16533  593 

594 

595 
(** proof data **) 

596 

597 
signature PROOF_DATA_ARGS = 

598 
sig 

599 
type T 

600 
val init: theory > T 

601 
end; 

602 

603 
signature PROOF_DATA = 

604 
sig 

605 
type T 

606 
val get: Context.proof > T 

607 
val put: T > Context.proof > Context.proof 

608 
val map: (T > T) > Context.proof > Context.proof 

609 
end; 

610 

611 
functor ProofDataFun(Data: PROOF_DATA_ARGS): PROOF_DATA = 

612 
struct 

613 

614 
structure ProofData = Context.ProofData; 

615 

616 
type T = Data.T; 

617 
exception Data of T; 

618 

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619 
val kind = ProofData.declare (Data o Data.init); 
16533  620 

621 
val get = ProofData.get kind (fn Data x => x); 

622 
val put = ProofData.put kind Data; 

623 
fun map f prf = put (f (get prf)) prf; 

624 

625 
end; 

626 

18632  627 

628 

629 
(** generic data **) 

630 

631 
signature GENERIC_DATA_ARGS = 

632 
sig 

633 
type T 

634 
val empty: T 

635 
val extend: T > T 

636 
val merge: Pretty.pp > T * T > T 

637 
end; 

638 

639 
signature GENERIC_DATA = 

640 
sig 

641 
type T 

642 
val get: Context.generic > T 

643 
val put: T > Context.generic > Context.generic 

644 
val map: (T > T) > Context.generic > Context.generic 

645 
end; 

646 

647 
functor GenericDataFun(Data: GENERIC_DATA_ARGS): GENERIC_DATA = 

648 
struct 

649 

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650 
structure ThyData = TheoryDataFun(open Data val copy = I); 
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651 
structure PrfData = ProofDataFun(type T = Data.T val init = ThyData.get); 
18632  652 

653 
type T = Data.T; 

654 

655 
fun get (Context.Theory thy) = ThyData.get thy 

656 
 get (Context.Proof prf) = PrfData.get prf; 

657 

658 
fun put x (Context.Theory thy) = Context.Theory (ThyData.put x thy) 

659 
 put x (Context.Proof prf) = Context.Proof (PrfData.put x prf); 

660 

661 
fun map f ctxt = put (f (get ctxt)) ctxt; 

662 

663 
end; 

664 

16533  665 
(*hide private interface*) 
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666 
structure Context: CONTEXT = Context; 
20297  667 

21518  668 
(*fake predeclarations*) 
20297  669 
structure Proof = struct type context = Context.proof end; 
21518  670 
structure ProofContext = 
671 
struct val theory_of = Context.theory_of_proof val init = Context.init_proof end; 