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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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(*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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exception PROOF of string * 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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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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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.curried_lookup (! kinds) k of 
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SOME kind => meth_fn kind > transform_failure (fn exn => 
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EXCEPTION (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 _ = change kinds (Inttab.curried_update (k, kind)); 
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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); 

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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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(* staleness *) 
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16533  196 
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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202 

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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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234 

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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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241 

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val str_of_thy = Pretty.str_of o pretty_abbrev_thy; 
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16533  245 
(* consistency *) (*exception TERM*) 
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16719  247 
fun check_thy thy = 
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if is_stale thy then 
16719  249 
raise TERM ("Stale theory encountered:\n" ^ string_of_thy thy, []) 
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else thy; 
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251 

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fun check_ins id ids = 
16894  253 
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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raise TERM ("Different versions of theory component " ^ quote (#2 id), []) 
17221  256 
else Inttab.curried_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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261 

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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  270 
(* equality and inclusion *) 
271 

16719  272 
val eq_thy = eq_id o pairself (#id o identity_of o check_thy); 
16533  273 

274 
fun proper_subthy 

16719  275 
(Theory ({id = (i, _), ...}, _, _, _), Theory ({ids, iids, ...}, _, _, _)) = 
16894  276 
Inttab.defined ids i orelse Inttab.defined iids i; 
16533  277 

278 
fun subthy thys = eq_thy thys orelse proper_subthy thys; 

279 

16594  280 
fun joinable (thy1, thy2) = subthy (thy1, thy2) orelse subthy (thy2, thy1); 
281 

16533  282 

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(* theory references *) 
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(*theory_ref provides a safe way to store dynamic references to a 
16533  286 
theory in external data structures  a plain theory value would 
287 
become stale as the self reference moves on*) 

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datatype theory_ref = TheoryRef of theory ref; 
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16719  291 
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  295 
(* trivial merge *) (*exception TERM*) 
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296 

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fun merge (thy1, thy2) = 
16719  298 
if eq_thy (thy1, thy2) then thy1 
299 
else if proper_subthy (thy2, thy1) then thy1 

300 
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  305 
fun merge_refs (ref1, ref2) = 
306 
if ref1 = ref2 then ref1 

307 
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  326 
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  330 
then (NONE, map_theory copy_data data, ancestry) 
331 
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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334 

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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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338 

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fun copy_thy (thy as Theory ({id, ids, iids, ...}, data, ancestry, history)) = 
16719  340 
(check_thy thy; 
16533  341 
create_thy draftN NONE id ids iids (map_theory copy_data data) ancestry history); 
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342 

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val pre_pure_thy = create_thy draftN NONE (serial (), draftN) Inttab.empty Inttab.empty 
16533  344 
(make_data Inttab.empty Inttab.empty) (make_ancestry [] []) (make_history ProtoPureN 0 []); 
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346 

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(* named theory nodes *) 
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348 

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fun merge_thys pp (thy1, thy2) = 
16533  350 
if exists_name CPureN thy1 <> exists_name CPureN thy2 then 
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error "Cannot merge Pure and CPure developments" 
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else 
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let 
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val (ids, iids) = check_merge thy1 thy2; 
16533  355 
val data1 = data_of thy1 and data2 = data_of thy2; 
356 
val data = make_data 

357 
(merge_data (pp thy1) (#theory data1, #theory data2)) 

358 
(Inttab.merge (K true) (#proof data1, #proof data2)); 

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359 
val ancestry = make_ancestry [] []; 
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360 
val history = make_history "" 0 []; 
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361 
in create_thy draftN NONE (serial (), draftN) ids iids data ancestry history end; 
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362 

16533  363 
fun maximal_thys thys = 
364 
thys > filter (fn thy => not (exists (fn thy' => proper_subthy (thy, thy')) thys)); 

365 

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366 
fun begin_thy pp name imports = 
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367 
if name = draftN then error ("Illegal theory name: " ^ quote draftN) 
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368 
else 
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369 
let 
16533  370 
val parents = 
16719  371 
maximal_thys (gen_distinct eq_thy (map check_thy imports)); 
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372 
val ancestors = gen_distinct eq_thy (parents @ List.concat (map ancestors_of parents)); 
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373 
val Theory ({id, ids, iids, ...}, data, _, _) = 
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374 
(case parents of 
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375 
[] => error "No parent theories" 
16533  376 
 [thy] => extend_thy thy 
377 
 thy :: thys => Library.foldl (merge_thys pp) (thy, thys)); 

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378 
val ancestry = make_ancestry parents ancestors; 
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379 
val history = make_history name 0 []; 
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380 
in create_thy draftN NONE id ids iids data ancestry history end; 
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381 

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382 

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383 
(* undoable checkpoints *) 
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384 

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385 
fun checkpoint_thy thy = 
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386 
if not (is_draft thy) then thy 
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387 
else 
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388 
let 
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389 
val {name, version, intermediates} = history_of thy; 
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390 
val thy' as Theory (identity', data', ancestry', _) = 
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391 
name_thy (name ^ ":" ^ string_of_int version) thy; 
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392 
val history' = make_history name (version + 1) (thy' :: intermediates); 
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393 
in vitalize (Theory (identity', data', ancestry', history')) end; 
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394 

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395 
fun finish_thy thy = 
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396 
let 
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397 
val {name, version, intermediates} = history_of thy; 
16719  398 
val rs = map (the_self o check_thy) intermediates; 
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399 
val thy' as Theory ({self, id, ids, ...}, data', ancestry', _) = name_thy name thy; 
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400 
val identity' = make_identity self id ids Inttab.empty; 
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401 
val history' = make_history name 0 []; 
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402 
val thy'' = vitalize (Theory (identity', data', ancestry', history')); 
16533  403 
val _ = List.app (fn r => r := thy'') rs; 
404 
in thy'' end; 

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405 

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406 

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407 
(* theory data *) 
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408 

16533  409 
fun dest_data name_of tab = 
410 
map name_of (Inttab.keys tab) 

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411 
> map (rpair ()) > Symtab.make_multi > Symtab.dest 
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412 
> map (apsnd length) 
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413 
> map (fn (name, 1) => name  (name, n) => name ^ enclose "[" "]" (string_of_int n)); 
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414 

16533  415 
val theory_data_of = dest_data invoke_name o #theory o data_of; 
416 

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417 
structure TheoryData = 
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418 
struct 
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419 

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420 
val declare = declare_theory_data; 
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421 

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422 
fun get k dest thy = 
17221  423 
(case Inttab.curried_lookup (#theory (data_of thy)) k of 
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424 
SOME x => (dest x handle Match => 
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425 
error ("Failed to access theory data " ^ quote (invoke_name k))) 
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426 
 NONE => error ("Uninitialized theory data " ^ quote (invoke_name k))); 
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427 

17221  428 
fun put k mk x = modify_thy (map_theory (Inttab.curried_update (k, mk x))); 
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429 
fun init k = put k I (invoke_empty k); 
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430 

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431 
end; 
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432 

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433 

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434 

16533  435 
(*** ML theory context ***) 
6185  436 

437 
local 

15531  438 
val current_theory = ref (NONE: theory option); 
6185  439 
in 
440 
fun get_context () = ! current_theory; 

441 
fun set_context opt_thy = current_theory := opt_thy; 

6238  442 
fun setmp opt_thy f x = Library.setmp current_theory opt_thy f x; 
6185  443 
end; 
444 

445 
fun the_context () = 

446 
(case get_context () of 

15531  447 
SOME thy => thy 
6185  448 
 _ => error "Unknown theory context"); 
449 

15531  450 
fun context thy = set_context (SOME thy); 
451 
fun reset_context () = set_context NONE; 

6185  452 

6310  453 
fun pass opt_thy f x = 
6261  454 
setmp opt_thy (fn x => let val y = f x in (y, get_context ()) end) x; 
455 

6310  456 
fun pass_theory thy f x = 
15531  457 
(case pass (SOME thy) f x of 
458 
(y, SOME thy') => (y, thy') 

459 
 (_, NONE) => error "Lost theory context in ML"); 

6261  460 

6238  461 
fun save f x = setmp (get_context ()) f x; 
462 

6185  463 

464 
(* map context *) 

465 

466 
nonfix >>; 

15531  467 
fun >> f = set_context (SOME (f (the_context ()))); 
6185  468 

469 

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470 
(* use ML text *) 
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471 

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472 
val ml_output = (writeln, error_msg); 
14976  473 

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474 
fun use_output verbose txt = use_text ml_output verbose (Symbol.escape txt); 
10914  475 

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476 
fun use_mltext txt verbose opt_thy = setmp opt_thy (fn () => use_output verbose txt) (); 
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477 
fun use_mltext_theory txt verbose thy = #2 (pass_theory thy (use_output verbose) txt); 
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478 

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479 
fun use_context txt = use_mltext_theory ("Context.>> (" ^ txt ^ ");") false; 
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480 

9586  481 
fun use_let bind body txt = 
482 
use_context ("let " ^ bind ^ " = " ^ txt ^ " in\n" ^ body ^ " end"); 

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483 

15801  484 

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485 
(* delayed theory setup *) 
15801  486 

487 
local 

488 
val setup_fns = ref ([]: (theory > theory) list); 

489 
in 

490 
fun add_setup fns = setup_fns := ! setup_fns @ fns; 

491 
fun setup () = let val fns = ! setup_fns in setup_fns := []; fns end; 

492 
end; 

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493 

16533  494 

495 

496 
(*** proof context ***) 

497 

498 
(* datatype proof *) 

499 

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500 
datatype proof = Proof of theory_ref * Object.T Inttab.table; 
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501 

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502 
exception PROOF of string * proof; 
16533  503 

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504 
fun theory_of_proof (Proof (thy_ref, _)) = deref thy_ref; 
16533  505 
fun data_of_proof (Proof (_, data)) = data; 
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506 
fun map_prf f (Proof (thy_ref, data)) = Proof (thy_ref, f data); 
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507 

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508 
fun transfer_proof thy' (prf as Proof (thy_ref, data)) = 
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509 
if not (subthy (deref thy_ref, thy')) then 
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510 
raise PROOF ("transfer proof context: no a super theory", prf) 
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511 
else Proof (self_ref thy', data); 
16533  512 

513 

514 
(* proof data kinds *) 

515 

516 
local 

517 

518 
type kind = 

519 
{name: string, 

520 
init: theory > Object.T}; 

521 

522 
val kinds = ref (Inttab.empty: kind Inttab.table); 

523 

524 
fun invoke meth_name meth_fn k = 

17221  525 
(case Inttab.curried_lookup (! kinds) k of 
16533  526 
SOME kind => meth_fn kind > transform_failure (fn exn => 
17340  527 
EXCEPTION (exn, "Proof data method " ^ #name kind ^ "." ^ meth_name ^ " failed")) 
16533  528 
 NONE => sys_error ("Invalid proof data identifier " ^ string_of_int k)); 
529 

530 
fun invoke_name k = invoke "name" (K o #name) k (); 

531 
val invoke_init = invoke "init" #init; 

532 

533 
in 

534 

535 
val proof_data_of = dest_data invoke_name o #proof o data_of; 

536 

537 
fun init_proof thy = 

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538 
Proof (self_ref thy, Inttab.map' (fn k => fn _ => invoke_init k thy) (#proof (data_of thy))); 
16533  539 

540 
structure ProofData = 

541 
struct 

542 

543 
fun declare name init = 

544 
let 

545 
val k = serial (); 

546 
val kind = {name = name, init = init}; 

547 
val _ = conditional (Inttab.exists (equal name o #name o #2) (! kinds)) (fn () => 

548 
warning ("Duplicate declaration of proof data " ^ quote name)); 

17221  549 
val _ = change kinds (Inttab.curried_update (k, kind)); 
16533  550 
in k end; 
551 

17221  552 
fun init k = modify_thy (map_proof (Inttab.curried_update (k, ()))); 
16533  553 

554 
fun get k dest prf = 

17221  555 
(case Inttab.curried_lookup (data_of_proof prf) k of 
16533  556 
SOME x => (dest x handle Match => 
557 
error ("Failed to access proof data " ^ quote (invoke_name k))) 

558 
 NONE => error ("Uninitialized proof data " ^ quote (invoke_name k))); 

559 

17221  560 
fun put k mk x = map_prf (Inttab.curried_update (k, mk x)); 
16533  561 

562 
end; 

563 

564 
end; 

565 

566 

567 
(*** generic context ***) 

568 

569 
datatype context = Theory of theory  Proof of proof; 

570 

571 
fun theory_of (Theory thy) = thy 

572 
 theory_of (Proof prf) = theory_of_proof prf; 

573 

574 
fun proof_of (Theory thy) = init_proof thy 

575 
 proof_of (Proof prf) = prf; 

576 

6185  577 
end; 
578 

579 
structure BasicContext: BASIC_CONTEXT = Context; 

580 
open BasicContext; 

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581 

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582 

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583 

16533  584 
(*** typesafe interfaces for data declarations ***) 
585 

586 
(** theory data **) 

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587 

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588 
signature THEORY_DATA_ARGS = 
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589 
sig 
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590 
val name: string 
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591 
type T 
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592 
val empty: T 
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593 
val copy: T > T 
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594 
val extend: T > T 
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595 
val merge: Pretty.pp > T * T > T 
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596 
val print: theory > T > unit 
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597 
end; 
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598 

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599 
signature THEORY_DATA = 
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600 
sig 
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601 
type T 
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602 
val init: theory > theory 
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603 
val print: theory > unit 
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604 
val get: theory > T 
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605 
val get_sg: theory > T (*obsolete*) 
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606 
val put: T > theory > theory 
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val map: (T > T) > theory > theory 
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608 
end; 
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609 

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610 
functor TheoryDataFun(Data: THEORY_DATA_ARGS): THEORY_DATA = 
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611 
struct 
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612 

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613 
structure TheoryData = Context.TheoryData; 
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614 

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615 
type T = Data.T; 
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616 
exception Data of T; 
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617 

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618 
val kind = TheoryData.declare Data.name 
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619 
(Data Data.empty) 
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620 
(fn Data x => Data (Data.copy x)) 
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621 
(fn Data x => Data (Data.extend x)) 
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622 
(fn pp => fn (Data x1, Data x2) => Data (Data.merge pp (x1, x2))); 
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623 

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624 
val init = TheoryData.init kind; 
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625 
val get = TheoryData.get kind (fn Data x => x); 
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626 
val get_sg = get; 
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627 
fun print thy = Data.print thy (get thy); 
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628 
val put = TheoryData.put kind Data; 
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629 
fun map f thy = put (f (get thy)) thy; 
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630 

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631 
end; 
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632 

16533  633 

634 

635 
(** proof data **) 

636 

637 
signature PROOF_DATA_ARGS = 

638 
sig 

639 
val name: string 

640 
type T 

641 
val init: theory > T 

642 
val print: Context.proof > T > unit 

643 
end; 

644 

645 
signature PROOF_DATA = 

646 
sig 

647 
type T 

648 
val init: theory > theory 

649 
val print: Context.proof > unit 

650 
val get: Context.proof > T 

651 
val put: T > Context.proof > Context.proof 

652 
val map: (T > T) > Context.proof > Context.proof 

653 
end; 

654 

655 
functor ProofDataFun(Data: PROOF_DATA_ARGS): PROOF_DATA = 

656 
struct 

657 

658 
structure ProofData = Context.ProofData; 

659 

660 
type T = Data.T; 

661 
exception Data of T; 

662 

663 
val kind = ProofData.declare Data.name (Data o Data.init); 

664 

665 
val init = ProofData.init kind; 

666 
val get = ProofData.get kind (fn Data x => x); 

667 
fun print prf = Data.print prf (get prf); 

668 
val put = ProofData.put kind Data; 

669 
fun map f prf = put (f (get prf)) prf; 

670 

671 
end; 

672 

673 
(*hide private interface*) 

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674 
structure Context: CONTEXT = Context; 