author  wenzelm 
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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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development graph and history support. Implicit theory contexts in ML. 
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Generic proof 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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val context: theory > unit 
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val the_context: unit > theory 

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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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exception DATA_FAIL of exn * string 
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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 ProtoPureN: string 
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val PureN: string 
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val CPureN: string 
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val draftN: string 
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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 check_thy: theory > theory 
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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 (*exception TERM*) 
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val merge_refs: theory_ref * theory_ref > theory_ref (*exception TERM*) 
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val self_ref: theory > theory_ref 
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val deref: theory_ref > theory 
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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 theory_data_of: theory > string list 
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val pre_pure_thy: theory 
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val begin_thy: (theory > Pretty.pp) > string > theory list > theory 
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(*ML theory context*) 
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val get_context: unit > theory option 
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val set_context: theory option > unit 

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val reset_context: unit > unit 

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val setmp: theory option > ('a > 'b) > 'a > 'b 
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val pass: theory option > ('a > 'b) > 'a > 'b * theory option 
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val pass_theory: theory > ('a > 'b) > 'a > 'b * theory 

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val save: ('a > 'b) > 'a > 'b 
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val >> : (theory > theory) > unit 
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val ml_output: (string > unit) * (string > unit) 
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val use_mltext: string > bool > theory option > unit 
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val use_mltext_theory: string > bool > theory > theory 
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val use_let: string > string > string > theory > theory 
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val add_setup: (theory > theory) list > unit 
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val setup: unit > (theory > theory) list 

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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 init_proof: theory > proof 

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val proof_data_of: theory > string list 

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(*generic context*) 

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datatype context = Theory of theory  Proof of proof 

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val theory_of: context > theory 

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val proof_of: context > proof 

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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: string > 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 init: serial > theory > theory 
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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: string > (theory > Object.T) > serial 

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val init: serial > theory > theory 

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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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exception DATA_FAIL of exn * string; 
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local 
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type kind = 
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{name: string, 
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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 (Inttab.empty: kind Inttab.table); 
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fun invoke meth_name meth_fn k = 
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(case Inttab.lookup (! kinds, k) of 
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SOME kind => meth_fn kind > transform_failure (fn exn => 
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DATA_FAIL (exn, "Theory data method " ^ #name kind ^ "." ^ meth_name ^ " failed")) 
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 NONE => sys_error ("Invalid theory data identifier " ^ string_of_int k)); 
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in 
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fun invoke_name k = invoke "name" (K o #name) k (); 
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fun invoke_empty k = invoke "empty" (K o #empty) k (); 
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val invoke_copy = invoke "copy" #copy; 
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val invoke_extend = invoke "extend" #extend; 
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fun invoke_merge pp = invoke "merge" (fn kind => #merge kind pp); 
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fun declare_theory_data name empty copy extend merge = 
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let 
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val k = serial (); 
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val kind = {name = name, empty = empty, copy = copy, extend = extend, merge = merge}; 
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val _ = conditional (Inttab.exists (equal name o #name o #2) (! kinds)) (fn () => 
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warning ("Duplicate declaration of theory data " ^ quote name)); 
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val _ = kinds := Inttab.update ((k, kind), ! kinds); 
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in k end; 
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val copy_data = Inttab.map' invoke_copy; 
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val extend_data = Inttab.map' invoke_extend; 
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fun merge_data pp = Inttab.join (SOME oo 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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{theory: Object.T Inttab.table, (*theory data record*) 

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proof: unit Inttab.table} * (*proof data kinds*) 

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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_data theory proof = {theory = theory, proof = proof}; 
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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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fun map_theory f {theory, proof} = make_data (f theory) proof; 
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fun map_proof f {theory, proof} = make_data theory (f proof); 

188 

189 
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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(* staleness *) 
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16533  197 
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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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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(* names *) 
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val ProtoPureN = "ProtoPure"; 
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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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fun exists_name name (Theory ({id, ids, iids, ...}, _, _, _)) = 
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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, iids, ...}, _, _, _)) = 
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rev (#2 id :: Inttab.fold (cons o #2) iids (Inttab.fold (cons o #2) ids [])); 
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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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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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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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val str_of_thy = Pretty.str_of o pretty_abbrev_thy; 
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16533  246 
(* consistency *) (*exception TERM*) 
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16719  248 
fun check_thy thy = 
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if is_stale thy then 
16719  250 
raise TERM ("Stale theory encountered:\n" ^ string_of_thy thy, []) 
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else thy; 
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fun check_ins id ids = 
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if draft_id id orelse is_some (Inttab.lookup (ids, #1 id)) then ids 
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else if Inttab.exists (equal (#2 id) o #2) ids then 
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raise TERM ("Different versions of theory component " ^ quote (#2 id), []) 
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else Inttab.update (id, ids); 
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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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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  271 
(* equality and inclusion *) 
272 

16719  273 
val eq_thy = eq_id o pairself (#id o identity_of o check_thy); 
16533  274 

275 
fun proper_subthy 

16719  276 
(Theory ({id = (i, _), ...}, _, _, _), Theory ({ids, iids, ...}, _, _, _)) = 
277 
is_some (Inttab.lookup (ids, i)) orelse is_some (Inttab.lookup (iids, i)); 

16533  278 

279 
fun subthy thys = eq_thy thys orelse proper_subthy thys; 

280 

16594  281 
fun joinable (thy1, thy2) = subthy (thy1, thy2) orelse subthy (thy2, thy1); 
282 

16533  283 

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(* theory references *) 
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(*theory_ref provides a safe way to store dynamic references to a 
16533  287 
theory in external data structures  a plain theory value would 
288 
become stale as the self reference moves on*) 

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datatype theory_ref = TheoryRef of theory ref; 
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16719  292 
val self_ref = TheoryRef o the_self o check_thy; 
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fun deref (TheoryRef (ref thy)) = thy; 
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16533  296 
(* trivial merge *) (*exception TERM*) 
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fun merge (thy1, thy2) = 
16719  299 
if eq_thy (thy1, thy2) then thy1 
300 
else if proper_subthy (thy2, thy1) then thy1 

301 
else if proper_subthy (thy1, thy2) then thy2 

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else (check_merge thy1 thy2; 
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raise TERM (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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16719  306 
fun merge_refs (ref1, ref2) = 
307 
if ref1 = ref2 then ref1 

308 
else self_ref (merge (deref ref1, deref ref2)); 

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(** build theories **) 
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(* primitives *) 
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fun create_thy name self id ids iids data ancestry history = 
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let 
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val intermediate = #version history > 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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fun change_thy name f (thy as Theory ({self, id, ids, iids}, data, ancestry, history)) = 
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let 
16719  327 
val _ = check_thy 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 
16533  331 
then (NONE, map_theory copy_data data, ancestry) 
332 
else (NONE, map_theory extend_data data, make_ancestry [thy] (thy :: #ancestors ancestry)); 

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val data'' = f data'; 
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in create_thy name self' id ids iids data'' ancestry' history end; 
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335 

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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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339 

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fun copy_thy (thy as Theory ({id, ids, iids, ...}, data, ancestry, history)) = 
16719  341 
(check_thy thy; 
16533  342 
create_thy draftN NONE id ids iids (map_theory copy_data data) ancestry history); 
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343 

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val pre_pure_thy = create_thy draftN NONE (serial (), draftN) Inttab.empty Inttab.empty 
16533  345 
(make_data Inttab.empty Inttab.empty) (make_ancestry [] []) (make_history ProtoPureN 0 []); 
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346 

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347 

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(* named theory nodes *) 
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349 

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fun merge_thys pp (thy1, thy2) = 
16533  351 
if exists_name CPureN thy1 <> exists_name CPureN thy2 then 
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352 
error "Cannot merge Pure and CPure developments" 
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353 
else 
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354 
let 
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355 
val (ids, iids) = check_merge thy1 thy2; 
16533  356 
val data1 = data_of thy1 and data2 = data_of thy2; 
357 
val data = make_data 

358 
(merge_data (pp thy1) (#theory data1, #theory data2)) 

359 
(Inttab.merge (K true) (#proof data1, #proof data2)); 

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360 
val ancestry = make_ancestry [] []; 
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361 
val history = make_history "" 0 []; 
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362 
in create_thy draftN NONE (serial (), draftN) ids iids data ancestry history end; 
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363 

16533  364 
fun maximal_thys thys = 
365 
thys > filter (fn thy => not (exists (fn thy' => proper_subthy (thy, thy')) thys)); 

366 

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367 
fun begin_thy pp name imports = 
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368 
if name = draftN then error ("Illegal theory name: " ^ quote draftN) 
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369 
else 
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370 
let 
16533  371 
val parents = 
16719  372 
maximal_thys (gen_distinct eq_thy (map check_thy imports)); 
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373 
val ancestors = gen_distinct eq_thy (parents @ List.concat (map ancestors_of parents)); 
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374 
val Theory ({id, ids, iids, ...}, data, _, _) = 
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375 
(case parents of 
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376 
[] => error "No parent theories" 
16533  377 
 [thy] => extend_thy thy 
378 
 thy :: thys => Library.foldl (merge_thys pp) (thy, thys)); 

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379 
val ancestry = make_ancestry parents ancestors; 
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380 
val history = make_history name 0 []; 
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381 
in create_thy draftN NONE id ids iids data ancestry history end; 
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382 

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383 

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384 
(* undoable checkpoints *) 
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385 

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386 
fun checkpoint_thy thy = 
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387 
if not (is_draft thy) then thy 
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388 
else 
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389 
let 
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390 
val {name, version, intermediates} = history_of thy; 
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391 
val thy' as Theory (identity', data', ancestry', _) = 
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392 
name_thy (name ^ ":" ^ string_of_int version) thy; 
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393 
val history' = make_history name (version + 1) (thy' :: intermediates); 
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394 
in vitalize (Theory (identity', data', ancestry', history')) end; 
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395 

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396 
fun finish_thy thy = 
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397 
let 
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398 
val {name, version, intermediates} = history_of thy; 
16719  399 
val rs = map (the_self o check_thy) intermediates; 
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400 
val thy' as Theory ({self, id, ids, ...}, data', ancestry', _) = name_thy name thy; 
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401 
val identity' = make_identity self id ids Inttab.empty; 
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402 
val history' = make_history name 0 []; 
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403 
val thy'' = vitalize (Theory (identity', data', ancestry', history')); 
16533  404 
val _ = List.app (fn r => r := thy'') rs; 
405 
in thy'' end; 

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406 

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407 

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408 
(* theory data *) 
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409 

16533  410 
fun dest_data name_of tab = 
411 
map name_of (Inttab.keys tab) 

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412 
> map (rpair ()) > Symtab.make_multi > Symtab.dest 
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413 
> map (apsnd length) 
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414 
> map (fn (name, 1) => name  (name, n) => name ^ enclose "[" "]" (string_of_int n)); 
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415 

16533  416 
val theory_data_of = dest_data invoke_name o #theory o data_of; 
417 

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418 
structure TheoryData = 
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419 
struct 
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420 

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421 
val declare = declare_theory_data; 
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422 

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423 
fun get k dest thy = 
16533  424 
(case Inttab.lookup (#theory (data_of thy), k) of 
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425 
SOME x => (dest x handle Match => 
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426 
error ("Failed to access theory data " ^ quote (invoke_name k))) 
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427 
 NONE => error ("Uninitialized theory data " ^ quote (invoke_name k))); 
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428 

16533  429 
fun put k mk x = modify_thy (map_theory (curry Inttab.update (k, mk x))); 
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430 
fun init k = put k I (invoke_empty k); 
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431 

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432 
end; 
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433 

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434 

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435 

16533  436 
(*** ML theory context ***) 
6185  437 

438 
local 

15531  439 
val current_theory = ref (NONE: theory option); 
6185  440 
in 
441 
fun get_context () = ! current_theory; 

442 
fun set_context opt_thy = current_theory := opt_thy; 

6238  443 
fun setmp opt_thy f x = Library.setmp current_theory opt_thy f x; 
6185  444 
end; 
445 

446 
fun the_context () = 

447 
(case get_context () of 

15531  448 
SOME thy => thy 
6185  449 
 _ => error "Unknown theory context"); 
450 

15531  451 
fun context thy = set_context (SOME thy); 
452 
fun reset_context () = set_context NONE; 

6185  453 

6310  454 
fun pass opt_thy f x = 
6261  455 
setmp opt_thy (fn x => let val y = f x in (y, get_context ()) end) x; 
456 

6310  457 
fun pass_theory thy f x = 
15531  458 
(case pass (SOME thy) f x of 
459 
(y, SOME thy') => (y, thy') 

460 
 (_, NONE) => error "Lost theory context in ML"); 

6261  461 

6238  462 
fun save f x = setmp (get_context ()) f x; 
463 

6185  464 

465 
(* map context *) 

466 

467 
nonfix >>; 

15531  468 
fun >> f = set_context (SOME (f (the_context ()))); 
6185  469 

470 

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471 
(* use ML text *) 
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472 

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473 
val ml_output = (writeln, error_msg); 
14976  474 

475 
fun use_output verb txt = use_text ml_output verb (Symbol.escape txt); 

10914  476 

10924
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477 
fun use_mltext txt verb opt_thy = setmp opt_thy (fn () => use_output verb txt) (); 
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478 
fun use_mltext_theory txt verb thy = #2 (pass_theory thy (use_output verb) txt); 
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479 

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480 
fun use_context txt = use_mltext_theory ("Context.>> (" ^ txt ^ ");") false; 
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481 

9586  482 
fun use_let bind body txt = 
483 
use_context ("let " ^ bind ^ " = " ^ txt ^ " in\n" ^ body ^ " end"); 

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484 

15801  485 

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486 
(* delayed theory setup *) 
15801  487 

488 
local 

489 
val setup_fns = ref ([]: (theory > theory) list); 

490 
in 

491 
fun add_setup fns = setup_fns := ! setup_fns @ fns; 

492 
fun setup () = let val fns = ! setup_fns in setup_fns := []; fns end; 

493 
end; 

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494 

16533  495 

496 

497 
(*** proof context ***) 

498 

499 
(* datatype proof *) 

500 

501 
datatype proof = Proof of theory * Object.T Inttab.table; 

502 

503 
fun theory_of_proof (Proof (thy, _)) = thy; 

504 
fun data_of_proof (Proof (_, data)) = data; 

505 
fun map_prf f (Proof (thy, data)) = Proof (thy, f data); 

506 

507 

508 
(* proof data kinds *) 

509 

510 
local 

511 

512 
type kind = 

513 
{name: string, 

514 
init: theory > Object.T}; 

515 

516 
val kinds = ref (Inttab.empty: kind Inttab.table); 

517 

518 
fun invoke meth_name meth_fn k = 

519 
(case Inttab.lookup (! kinds, k) of 

520 
SOME kind => meth_fn kind > transform_failure (fn exn => 

521 
DATA_FAIL (exn, "Proof data method " ^ #name kind ^ "." ^ meth_name ^ " failed")) 

522 
 NONE => sys_error ("Invalid proof data identifier " ^ string_of_int k)); 

523 

524 
fun invoke_name k = invoke "name" (K o #name) k (); 

525 
val invoke_init = invoke "init" #init; 

526 

527 
in 

528 

529 
val proof_data_of = dest_data invoke_name o #proof o data_of; 

530 

531 
fun init_proof thy = 

532 
Proof (thy, Inttab.map' (fn k => fn _ => invoke_init k thy) (#proof (data_of thy))); 

533 

534 
structure ProofData = 

535 
struct 

536 

537 
fun declare name init = 

538 
let 

539 
val k = serial (); 

540 
val kind = {name = name, init = init}; 

541 
val _ = conditional (Inttab.exists (equal name o #name o #2) (! kinds)) (fn () => 

542 
warning ("Duplicate declaration of proof data " ^ quote name)); 

543 
val _ = kinds := Inttab.update ((k, kind), ! kinds); 

544 
in k end; 

545 

546 
fun init k = modify_thy (map_proof (curry Inttab.update (k, ()))); 

547 

548 
fun get k dest prf = 

549 
(case Inttab.lookup (data_of_proof prf, k) of 

550 
SOME x => (dest x handle Match => 

551 
error ("Failed to access proof data " ^ quote (invoke_name k))) 

552 
 NONE => error ("Uninitialized proof data " ^ quote (invoke_name k))); 

553 

554 
fun put k mk x = map_prf (curry Inttab.update (k, mk x)); 

555 

556 
end; 

557 

558 
end; 

559 

560 

561 
(*** generic context ***) 

562 

563 
datatype context = Theory of theory  Proof of proof; 

564 

565 
fun theory_of (Theory thy) = thy 

566 
 theory_of (Proof prf) = theory_of_proof prf; 

567 

568 
fun proof_of (Theory thy) = init_proof thy 

569 
 proof_of (Proof prf) = prf; 

570 

6185  571 
end; 
572 

573 
structure BasicContext: BASIC_CONTEXT = Context; 

574 
open BasicContext; 

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575 

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576 

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577 

16533  578 
(*** typesafe interfaces for data declarations ***) 
579 

580 
(** theory data **) 

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581 

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582 
signature THEORY_DATA_ARGS = 
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583 
sig 
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584 
val name: string 
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585 
type T 
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586 
val empty: T 
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587 
val copy: T > T 
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588 
val extend: T > T 
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589 
val merge: Pretty.pp > T * T > T 
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590 
val print: theory > T > unit 
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591 
end; 
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592 

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593 
signature THEORY_DATA = 
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594 
sig 
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595 
type T 
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596 
val init: theory > theory 
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597 
val print: theory > unit 
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598 
val get: theory > T 
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599 
val get_sg: theory > T (*obsolete*) 
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600 
val put: T > theory > theory 
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601 
val map: (T > T) > theory > theory 
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602 
end; 
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603 

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604 
functor TheoryDataFun(Data: THEORY_DATA_ARGS): THEORY_DATA = 
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605 
struct 
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606 

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607 
structure TheoryData = Context.TheoryData; 
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608 

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609 
type T = Data.T; 
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610 
exception Data of T; 
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parents:
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611 

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parents:
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612 
val kind = TheoryData.declare Data.name 
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parents:
15801
diff
changeset

613 
(Data Data.empty) 
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parents:
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diff
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614 
(fn Data x => Data (Data.copy x)) 
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parents:
15801
diff
changeset

615 
(fn Data x => Data (Data.extend x)) 
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parents:
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diff
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616 
(fn pp => fn (Data x1, Data x2) => Data (Data.merge pp (x1, x2))); 
16436
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added type theory: generic theory contexts with unique identity,
wenzelm
parents:
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diff
changeset

617 

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wenzelm
parents:
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diff
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618 
val init = TheoryData.init kind; 
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parents:
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619 
val get = TheoryData.get kind (fn Data x => x); 
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parents:
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620 
val get_sg = get; 
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621 
fun print thy = Data.print thy (get thy); 
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parents:
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622 
val put = TheoryData.put kind Data; 
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parents:
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623 
fun map f thy = put (f (get thy)) thy; 
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added type theory: generic theory contexts with unique identity,
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parents:
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624 

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625 
end; 
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626 

16533  627 

628 

629 
(** proof data **) 

630 

631 
signature PROOF_DATA_ARGS = 

632 
sig 

633 
val name: string 

634 
type T 

635 
val init: theory > T 

636 
val print: Context.proof > T > unit 

637 
end; 

638 

639 
signature PROOF_DATA = 

640 
sig 

641 
type T 

642 
val init: theory > theory 

643 
val print: Context.proof > unit 

644 
val get: Context.proof > T 

645 
val put: T > Context.proof > Context.proof 

646 
val map: (T > T) > Context.proof > Context.proof 

647 
end; 

648 

649 
functor ProofDataFun(Data: PROOF_DATA_ARGS): PROOF_DATA = 

650 
struct 

651 

652 
structure ProofData = Context.ProofData; 

653 

654 
type T = Data.T; 

655 
exception Data of T; 

656 

657 
val kind = ProofData.declare Data.name (Data o Data.init); 

658 

659 
val init = ProofData.init kind; 

660 
val get = ProofData.get kind (fn Data x => x); 

661 
fun print prf = Data.print prf (get prf); 

662 
val put = ProofData.put kind Data; 

663 
fun map f prf = put (f (get prf)) prf; 

664 

665 
end; 

666 

667 
(*hide private interface*) 

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changeset

668 
structure Context: CONTEXT = Context; 