author  wenzelm 
Tue, 19 Nov 1996 13:03:35 +0100  
changeset 2206  a9419797e196 
parent 1960  ae390b599213 
child 2359  97b88cafe1e8 
permissions  rwrr 
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(* Title: Pure/theory.ML 
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ID: $Id$ 

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Author: Lawrence C Paulson and Markus Wenzel 

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Copyright 1996 University of Cambridge 

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Theories 

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*) 

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signature THEORY = 

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sig 

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type theory 

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exception THEORY of string * theory list 

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val rep_theory : theory > 

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{sign: Sign.sg, oraopt: (Sign.sg * exn > term) option, 
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new_axioms: term Symtab.table, parents: theory list} 

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val sign_of : theory > Sign.sg 
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val syn_of : theory > Syntax.syntax 

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val stamps_of_thy : theory > string ref list 

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val parents_of : theory > theory list 

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val subthy : theory * theory > bool 

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val eq_thy : theory * theory > bool 

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val proto_pure_thy : theory 

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val pure_thy : theory 

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val cpure_thy : theory 

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(*theory primitives*) 

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val add_classes : (class * class list) list > theory > theory 
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val add_classrel : (class * class) list > theory > theory 

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val add_defsort : sort > theory > theory 

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val add_types : (string * int * mixfix) list > theory > theory 

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val add_tyabbrs : (string * string list * string * mixfix) list 

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> theory > theory 
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val add_tyabbrs_i : (string * string list * typ * mixfix) list 
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> theory > theory 
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val add_arities : (string * sort list * sort) list > theory > theory 
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val add_consts : (string * string * mixfix) list > theory > theory 

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val add_consts_i : (string * typ * mixfix) list > theory > theory 

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val add_syntax : (string * string * mixfix) list > theory > theory 

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val add_syntax_i : (string * typ * mixfix) list > theory > theory 

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val add_modesyntax : string > (string * string * mixfix) list > theory > theory 
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val add_modesyntax_i : string > (string * typ * mixfix) list > theory > theory 

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val add_trfuns : 
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(string * (Syntax.ast list > Syntax.ast)) list * 
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(string * (term list > term)) list * 

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(string * (term list > term)) list * 

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(string * (Syntax.ast list > Syntax.ast)) list > theory > theory 

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val add_trrules : (string * string)Syntax.trrule list > theory > theory 

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val add_trrules_i : Syntax.ast Syntax.trrule list > theory > theory 
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val cert_axm : Sign.sg > string * term > string * term 
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val read_axm : Sign.sg > string * string > string * term 

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val inferT_axm : Sign.sg > string * term > string * term 

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val add_axioms : (string * string) list > theory > theory 
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val add_axioms_i : (string * term) list > theory > theory 

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val add_thyname : string > theory > theory 

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val set_oracle : (Sign.sg * exn > term) > theory > theory 

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val merge_theories : theory * theory > theory 

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val merge_thy_list : bool > theory list > theory 

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end; 

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structure Theory : THEORY = 

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struct 

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(** datatype theory **) 

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datatype theory = 

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Theory of { 

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sign: Sign.sg, 

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oraopt: (Sign.sg * exn > term) option, 
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new_axioms: term Symtab.table, 
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parents: theory list}; 

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fun rep_theory (Theory args) = args; 

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(*errors involving theories*) 

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exception THEORY of string * theory list; 

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val sign_of = #sign o rep_theory; 

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val syn_of = #syn o Sign.rep_sg o sign_of; 

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(*stamps associated with a theory*) 

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val stamps_of_thy = #stamps o Sign.rep_sg o sign_of; 

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(*return the immediate ancestors*) 

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val parents_of = #parents o rep_theory; 

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(*compare theories*) 

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val subthy = Sign.subsig o pairself sign_of; 

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val eq_thy = Sign.eq_sg o pairself sign_of; 

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(* the Pure theories *) 

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val proto_pure_thy = 

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Theory {sign = Sign.proto_pure, oraopt = None, 
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new_axioms = Symtab.null, parents = []}; 

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val pure_thy = 

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Theory {sign = Sign.pure, oraopt = None, 
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new_axioms = Symtab.null, parents = []}; 

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val cpure_thy = 

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Theory {sign = Sign.cpure, oraopt = None, 
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new_axioms = Symtab.null, parents = []}; 

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(** extend theory **) 

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fun err_dup_axms names = 

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error ("Duplicate axiom name(s) " ^ commas_quote names); 

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fun ext_thy (thy as Theory {sign, oraopt, new_axioms, parents}) 
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sign1 new_axms = 

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let 
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val draft = Sign.is_draft sign; 

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val new_axioms1 = 

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Symtab.extend_new (if draft then new_axioms else Symtab.null, new_axms) 

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handle Symtab.DUPS names => err_dup_axms names; 

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val parents1 = if draft then parents else [thy]; 

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in 

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Theory {sign = sign1, oraopt = oraopt, 
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new_axioms = new_axioms1, parents = parents1} 

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end; 
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(* extend signature of a theory *) 

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fun ext_sg extfun decls (thy as Theory {sign, ...}) = 

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ext_thy thy (extfun decls sign) []; 

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val add_classes = ext_sg Sign.add_classes; 
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val add_classrel = ext_sg Sign.add_classrel; 

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val add_defsort = ext_sg Sign.add_defsort; 

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val add_types = ext_sg Sign.add_types; 

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val add_tyabbrs = ext_sg Sign.add_tyabbrs; 

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val add_tyabbrs_i = ext_sg Sign.add_tyabbrs_i; 

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val add_arities = ext_sg Sign.add_arities; 

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val add_consts = ext_sg Sign.add_consts; 

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val add_consts_i = ext_sg Sign.add_consts_i; 

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val add_syntax = ext_sg Sign.add_syntax; 

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val add_syntax_i = ext_sg Sign.add_syntax_i; 

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val add_modesyntax = curry (ext_sg Sign.add_modesyntax); 

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val add_modesyntax_i = curry (ext_sg Sign.add_modesyntax_i); 

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val add_trfuns = ext_sg Sign.add_trfuns; 

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val add_trrules = ext_sg Sign.add_trrules; 

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val add_trrules_i = ext_sg Sign.add_trrules_i; 

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val add_thyname = ext_sg Sign.add_name; 

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(* prepare axioms *) 

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fun err_in_axm name = 

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error ("The error(s) above occurred in axiom " ^ quote name); 

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fun no_vars tm = 

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if null (term_vars tm) andalso null (term_tvars tm) then tm 

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else error "Illegal schematic variable(s) in term"; 

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fun cert_axm sg (name, raw_tm) = 

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let 

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val (t, T, _) = Sign.certify_term sg raw_tm 

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handle TYPE arg => error (Sign.exn_type_msg sg arg) 

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 TERM (msg, _) => error msg; 

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in 

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assert (T = propT) "Term not of type prop"; 

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(name, no_vars t) 

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end 

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handle ERROR => err_in_axm name; 

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(*Some duplication of code with read_def_cterm*) 

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fun read_axm sg (name, str) = 

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let val ts = Syntax.read (#syn (Sign.rep_sg sg)) propT str; 

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val (_, t, _) = 

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Sign.infer_types sg (K None) (K None) [] true (ts,propT); 

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in cert_axm sg (name,t) end 
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handle ERROR => err_in_axm name; 
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fun inferT_axm sg (name, pre_tm) = 

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let val t = #2(Sign.infer_types sg (K None) (K None) [] true 

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([pre_tm], propT)) 

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in (name, no_vars t) end 

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handle ERROR => err_in_axm name; 

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(* extend axioms of a theory *) 

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fun ext_axms prep_axm axms (thy as Theory {sign, ...}) = 

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let 

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val sign1 = Sign.make_draft sign; 

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val axioms = map (apsnd (Term.compress_term o Logic.varify) o 

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prep_axm sign) 

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axms; 

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in 

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ext_thy thy sign1 axioms 

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end; 

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val add_axioms = ext_axms read_axm; 

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val add_axioms_i = ext_axms cert_axm; 

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(** Set oracle of theory **) 
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fun set_oracle oracle 

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(thy as Theory {sign, oraopt = None, new_axioms, parents}) = 

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if Sign.is_draft sign then 

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Theory {sign = sign, 

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oraopt = Some oracle, 

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new_axioms = new_axioms, 

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parents = parents} 

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else raise THEORY ("Can only set oracle of a draft", [thy]) 

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 set_oracle _ thy = raise THEORY ("Oracle already set", [thy]); 

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(** merge theories **) 

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fun merge_thy_list mk_draft thys = 

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let 

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fun is_union thy = forall (fn t => subthy (t, thy)) thys; 

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val is_draft = Sign.is_draft o sign_of; 

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fun add_sign (sg, Theory {sign, ...}) = 

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Sign.merge (sg, sign) handle TERM (msg, _) => error msg; 

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in 

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case (find_first is_union thys, exists is_draft thys) of 
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(Some thy, _) => thy 
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 (None, true) => raise THEORY ("Illegal merge of draft theories", thys) 

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 (None, false) => Theory { 

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sign = 

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(if mk_draft then Sign.make_draft else I) 

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(foldl add_sign (Sign.proto_pure, thys)), 

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oraopt = None, 
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new_axioms = Symtab.null, 
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parents = thys} 
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end; 
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fun merge_theories (thy1, thy2) = merge_thy_list false [thy1, thy2]; 

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end; 

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open Theory; 