%% ``The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved via the world wide web at http://www.erlang.org/.
%% 
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% 
%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
%% AB. All Rights Reserved.''
%% 
%%     $Id: asn1ct_gen_per.erl,v 1.1 2008/12/17 09:53:30 mikpe Exp $
%%
-module(asn1ct_gen_per).

%% Generate erlang module which handles (PER) encode and decode for
%% all types in an ASN.1 module

-include("asn1_records.hrl").
%-compile(export_all).

-export([pgen/4,gen_dec_prim/3,gen_encode_prim/4]).
-export([gen_obj_code/3,gen_objectset_code/2]).
-export([gen_decode/2, gen_decode/3]).
-export([gen_encode/2, gen_encode/3]).
-export([is_already_generated/2,more_genfields/1,get_class_fields/1,
	 get_object_field/2]).

-import(asn1ct_gen, [emit/1,demit/1]).

%% pgen(Erules, Module, TypeOrVal)
%% Generate Erlang module (.erl) and (.hrl) file corresponding to an ASN.1 module
%% .hrl file is only generated if necessary
%% Erules = per | ber
%% Module = atom()
%% TypeOrVal = {TypeList,ValueList}
%% TypeList = ValueList = [atom()]

pgen(OutFile,Erules,Module,TypeOrVal) ->
    asn1ct_gen:pgen_module(OutFile,Erules,Module,TypeOrVal,true).


%% Generate ENCODING ******************************
%%****************************************x


gen_encode(Erules,Type) when record(Type,typedef) ->
    gen_encode_user(Erules,Type).
%%    case Type#typedef.typespec of
%%	Def when record(Def,type) ->	    
%%	    gen_encode_user(Erules,Type);
%%	Def when tuple(Def),(element(1,Def) == 'Object') ->
%%	    gen_encode_object(Erules,Type);
%%	Other ->
%%	    exit({error,{asn1,{unknown,Other}}})
%%    end.

gen_encode(Erules,Typename,#'ComponentType'{name=Cname,typespec=Type}) ->
    NewTypename = [Cname|Typename],
    gen_encode(Erules,NewTypename,Type);

gen_encode(Erules,Typename,Type) when record(Type,type) ->
    InnerType = asn1ct_gen:get_inner(Type#type.def),
    ObjFun =
	case lists:keysearch(objfun,1,Type#type.tablecinf) of
	    {value,{_,_Name}} ->
%%		lists:concat([", ObjFun",Name]);
		", ObjFun";
	    false ->
		""
	end,
    case asn1ct_gen:type(InnerType) of
	{constructed,bif} ->
	    case InnerType of
		'SET' ->
		    true;
		'SEQUENCE' ->
		    true;
		_ ->
		    emit({nl,"'enc_",asn1ct_gen:list2name(Typename),
			  "'({'",asn1ct_gen:list2name(Typename),
			  "',Val}",ObjFun,") ->",nl}),
		    emit({"'enc_",asn1ct_gen:list2name(Typename),
			  "'(Val",ObjFun,");",nl,nl})
	    end,
	    emit({"'enc_",asn1ct_gen:list2name(Typename),"'(Val",ObjFun,
		  ") ->",nl}),
	    asn1ct_gen:gen_encode_constructed(Erules,Typename,InnerType,Type);
	_ ->
	    true
    end.


gen_encode_user(Erules,D) when record(D,typedef) ->
    CurrMod = get(currmod),
    Typename = [D#typedef.name],
    Def = D#typedef.typespec,
    InnerType = asn1ct_gen:get_inner(Def#type.def),
    case InnerType of
	'SET' -> true;
	'SEQUENCE' -> true;
	_ ->
	    emit({nl,"'enc_",asn1ct_gen:list2name(Typename),"'({'",asn1ct_gen:list2name(Typename),"',Val}) ->",nl}),
	    emit({"'enc_",asn1ct_gen:list2name(Typename),"'(Val);",nl,nl})
    end,
    emit({"'enc_",asn1ct_gen:list2name(Typename),"'(Val) ->",nl}),
    case asn1ct_gen:type(InnerType) of
	{primitive,bif} ->
	    gen_encode_prim(Erules,Def,"false"),
	    emit({".",nl});
	'ASN1_OPEN_TYPE' ->
	    gen_encode_prim(Erules,Def#type{def='ASN1_OPEN_TYPE'},"false"),
	    emit({".",nl});
	{constructed,bif} ->
	    asn1ct_gen:gen_encode_constructed(Erules,Typename,InnerType,D);
	#'Externaltypereference'{module=CurrMod,type=Etype} ->
	    emit({"'enc_",Etype,"'(Val).",nl,nl});
	#'Externaltypereference'{module=Emod,type=Etype} ->
	    emit({"'",Emod,"':'enc_",Etype,"'(Val).",nl,nl});
	#typereference{val=Ename} ->
	    emit({"'enc_",Ename,"'(Val).",nl,nl});
	{notype,_} ->
	    emit({"'enc_",InnerType,"'(Val).",nl,nl})
    end.


gen_encode_prim(Erules,D,DoTag) ->
    Value = case asn1ct_name:active(val) of
		true ->
		    asn1ct_gen:mk_var(asn1ct_name:curr(val));
		false ->
		    "Val"
	    end,
    gen_encode_prim(Erules,D,DoTag,Value).

gen_encode_prim(_Erules,D,_DoTag,Value) when record(D,type) ->
    Constraint = D#type.constraint,
    case D#type.def of
	'INTEGER' ->
	    emit({"?RT_PER:encode_integer(", %fel
		  {asis,Constraint},",",Value,")"});
	{'INTEGER',NamedNumberList} ->
	    emit({"?RT_PER:encode_integer(",
		  {asis,Constraint},",",Value,",",
		  {asis,NamedNumberList},")"});
	{'ENUMERATED',{Nlist1,Nlist2}} ->
	    NewList = lists:concat([[{0,X}||{X,_} <- Nlist1],['EXT_MARK'],[{1,X}||{X,_} <- Nlist2]]),
	    NewC = [{'ValueRange',{0,length(Nlist1)-1}}],
	    emit(["case (case ",Value," of {_,_}->element(2,",Value,");_->",
		  Value," end) of",nl]),
	    emit_enc_enumerated_cases(NewC, NewList++[{asn1_enum,length(Nlist1)-1}], 0);
	{'ENUMERATED',NamedNumberList} ->
	    NewList = [X||{X,_} <- NamedNumberList],
	    NewC = [{'ValueRange',{0,length(NewList)-1}}],
	    emit(["case (case ",Value," of {_,_}->element(2,",Value,");_->",
		  Value," end) of",nl]),
	    emit_enc_enumerated_cases(NewC, NewList, 0);
	{'BIT STRING',NamedNumberList} ->
	    emit({"?RT_PER:encode_bit_string(",
		  {asis,Constraint},",",Value,",",
		  {asis,NamedNumberList},")"});
	'NULL' ->
	    emit({"?RT_PER:encode_null(",Value,")"});
	'OBJECT IDENTIFIER' ->
	    emit({"?RT_PER:encode_object_identifier(",Value,")"});
	'ObjectDescriptor' ->
	    emit({"?RT_PER:encode_ObjectDescriptor(",{asis,Constraint},
		  ",",Value,")"});
	'BOOLEAN' ->
	    emit({"?RT_PER:encode_boolean(",Value,")"});
	'OCTET STRING' ->
	    emit({"?RT_PER:encode_octet_string(",{asis,Constraint},",",Value,")"});
	'NumericString' ->
	    emit({"?RT_PER:encode_NumericString(",{asis,Constraint},",",Value,")"});
	'TeletexString' ->
	    emit({"?RT_PER:encode_TeletexString(",{asis,Constraint},",",Value,")"});
	'VideotexString' ->
	    emit({"?RT_PER:encode_VideotexString(",{asis,Constraint},",",Value,")"});
	'UTCTime' ->
	    emit({"?RT_PER:encode_VisibleString(",{asis,Constraint},",",Value,")"});
	'GeneralizedTime' ->
	    emit({"?RT_PER:encode_VisibleString(",{asis,Constraint},",",Value,")"});
	'GraphicString' ->
	    emit({"?RT_PER:encode_GraphicString(",{asis,Constraint},",",Value,")"});
	'VisibleString' ->
	    emit({"?RT_PER:encode_VisibleString(",{asis,Constraint},",",Value,")"});
	'GeneralString' ->
	    emit({"?RT_PER:encode_GeneralString(",{asis,Constraint},",",Value,")"});
	'PrintableString' ->
	    emit({"?RT_PER:encode_PrintableString(",{asis,Constraint},",",Value,")"});
	'IA5String' ->
	    emit({"?RT_PER:encode_IA5String(",{asis,Constraint},",",Value,")"});
	'BMPString' ->
	    emit({"?RT_PER:encode_BMPString(",{asis,Constraint},",",Value,")"});
	'UniversalString' ->
	    emit({"?RT_PER:encode_UniversalString(",{asis,Constraint},",",Value,")"});
	'ANY' ->
	    emit(["?RT_PER:encode_open_type(", {asis,Constraint}, ",", 
		  Value, ")"]);
	'ASN1_OPEN_TYPE' ->
	    NewValue = case Constraint of
			   [#'Externaltypereference'{type=Tname}] ->
			     io_lib:format(
			       "?RT_PER:complete(enc_~s(~s))",[Tname,Value]);
			   [#type{def=#'Externaltypereference'{type=Tname}}] ->
			       io_lib:format(
				 "?RT_PER:complete(enc_~s(~s))",[Tname,Value]);
			 _ -> Value
		     end,
	    emit(["?RT_PER:encode_open_type(", {asis,Constraint}, ",", 
		  NewValue, ")"]);
	XX ->
	    exit({asn1_error,nyi,XX})
    end.

emit_enc_enumerated_cases(C, [H], Count) ->
    emit_enc_enumerated_case(C, H, Count),
    emit([";",nl,"EnumVal -> exit({error,{asn1, {enumerated_not_in_range, EnumVal}}})"]),
    emit([nl,"end"]);
emit_enc_enumerated_cases(C, ['EXT_MARK'|T], _Count) ->
    emit_enc_enumerated_cases(C, T, 0);
emit_enc_enumerated_cases(C, [H1,H2|T], Count) ->
    emit_enc_enumerated_case(C, H1, Count),
    emit([";",nl]),
    emit_enc_enumerated_cases(C, [H2|T], Count+1).
    


emit_enc_enumerated_case(_C, {asn1_enum,High}, _) ->
    emit([
	  "{asn1_enum,EnumV} when integer(EnumV), EnumV > ",High," -> ",
	  "[{bit,1},?RT_PER:encode_small_number(EnumV)]"]);
emit_enc_enumerated_case(_C, 'EXT_MARK', _Count) ->
    true;
emit_enc_enumerated_case(_C, {1,EnumName}, Count) ->
    emit(["'",EnumName,"' -> [{bit,1},?RT_PER:encode_small_number(",Count,")]"]);
emit_enc_enumerated_case(C, {0,EnumName}, Count) ->
    emit(["'",EnumName,"' -> [{bit,0},?RT_PER:encode_integer(",{asis,C},", ",Count,")]"]);
emit_enc_enumerated_case(C, EnumName, Count) ->
    emit(["'",EnumName,"' -> ?RT_PER:encode_integer(",{asis,C},", ",Count,")"]).


%% Object code generating for encoding and decoding
%% ------------------------------------------------

gen_obj_code(Erules,_Module,Obj) when record(Obj,typedef) ->
    ObjName = Obj#typedef.name,
    Def = Obj#typedef.typespec,
    #'Externaltypereference'{module=Mod,type=ClassName} = 
	Def#'Object'.classname,
    Class = asn1_db:dbget(Mod,ClassName),
    {object,_,Fields} = Def#'Object'.def,
    emit({nl,nl,nl,"%%================================"}),
    emit({nl,"%%  ",ObjName}),
    emit({nl,"%%================================",nl}),
    EncConstructed =
	gen_encode_objectfields(ClassName,get_class_fields(Class),
				ObjName,Fields,[]),
    emit(nl),
    gen_encode_constr_type(Erules,EncConstructed),
    emit(nl),
    DecConstructed =
	gen_decode_objectfields(ClassName,get_class_fields(Class),
				ObjName,Fields,[]),
    emit(nl),
    gen_decode_constr_type(Erules,DecConstructed),
    emit(nl);
gen_obj_code(_,_,Obj) when record(Obj,pobjectdef) ->
    ok.


gen_encode_objectfields(ClassName,[{typefield,Name,OptOrMand}|Rest],
			ObjName,ObjectFields,ConstrAcc) ->
    EmitFuncClause = 
	fun(V) ->
		emit(["'enc_",ObjName,"'(",{asis,Name},
		      ",",V,",_RestPrimFieldName) ->",nl])
	end,
%     emit(["'enc_",ObjName,"'(",{asis,Name},
% 	  ", Val, _RestPrimFieldName) ->",nl]),
    MaybeConstr =
	case {get_object_field(Name,ObjectFields),OptOrMand} of
	    {false,'MANDATORY'} -> %% this case is illegal
		exit({error,{asn1,{"missing mandatory field in object",
				   ObjName}}});
	    {false,'OPTIONAL'} ->
		EmitFuncClause("_"),
		emit("   []"),
		[];
	    {false,{'DEFAULT',DefaultType}} ->
		EmitFuncClause("Val"),
		gen_encode_default_call(ClassName,Name,DefaultType);
	    {{Name,TypeSpec},_} ->
		%% A specified field owerwrites any 'DEFAULT' or
		%% 'OPTIONAL' field in the class
		EmitFuncClause("Val"),
		gen_encode_field_call(ObjName,Name,TypeSpec)
	end,
    case more_genfields(Rest) of
	true ->
	    emit([";",nl]);
	false ->
	    emit([".",nl])
    end,
    gen_encode_objectfields(ClassName,Rest,ObjName,ObjectFields,
			    MaybeConstr++ConstrAcc);
gen_encode_objectfields(ClassName,[{objectfield,Name,_,_,OptOrMand}|Rest],
			ObjName,ObjectFields,ConstrAcc) ->
    EmitFuncClause =
	fun(Attrs) ->
		emit(["'enc_",ObjName,"'(",{asis,Name},
		      ",",Attrs,") ->",nl])
	end,
%     emit(["'enc_",ObjName,"'(",{asis,Name},
% 	  ", Val,[H|T]) ->",nl]),
    case {get_object_field(Name,ObjectFields),OptOrMand} of
	{false,'MANDATORY'} ->
	    exit({error,{asn1,{"missing mandatory field in object",
			       ObjName}}});
	{false,'OPTIONAL'} ->
	    EmitFuncClause("_,_"),
	    emit(["  exit({error,{'use of missing field in object', ",Name,
		  "}})"]);
	{false,{'DEFAULT',_DefaultObject}} ->
	    exit({error,{asn1,{"not implemented yet",Name}}});
	{{Name,TypeSpec},_} ->
	    EmitFuncClause("Val,[H|T]"),
	    case TypeSpec#typedef.name of
		{ExtMod,TypeName} ->
		    emit({indent(3),"'",ExtMod,"':'enc_",TypeName,
			  "'(H, Val, T)"});
		TypeName ->
		    emit({indent(3),"'enc_",TypeName,"'(H, Val, T)"})
	    end
    end,
    case more_genfields(Rest) of
	true ->
	    emit([";",nl]);
	false ->
	    emit([".",nl])
    end,
    gen_encode_objectfields(ClassName,Rest,ObjName,ObjectFields,ConstrAcc);
gen_encode_objectfields(ClassName,[_C|Cs],O,OF,Acc) ->
    gen_encode_objectfields(ClassName,Cs,O,OF,Acc);
gen_encode_objectfields(_,[],_,_,Acc) ->
    Acc.


% gen_encode_objectfields(Class,ObjName,[{FieldName,Type}|Rest],ConstrAcc) ->
%     Fields = Class#objectclass.fields,

%     MaybeConstr =
%     case is_typefield(Fields,FieldName) of
% 	true ->
% 	    Def = Type#typedef.typespec,
% 	    emit({"'enc_",ObjName,"'(",{asis,FieldName},
% 		  ", Val, Dummy) ->",nl}),

% 	    CAcc =
% 	    case Type#typedef.name of
% 		{primitive,bif} ->
% 		    gen_encode_prim(per,Def,"false","Val"),
% 		    [];
% 		{constructed,bif} ->
% 		    emit({"   'enc_",ObjName,'_',FieldName,
% 			  "'(Val)"}),
% 			[{['enc_',ObjName,'_',FieldName],Def}];
% 		{ExtMod,TypeName} ->
% 		    emit({"   '",ExtMod,"':'enc_",TypeName,"'(Val)"}),
% 		    [];
% 		TypeName ->
% 		    emit({"   'enc_",TypeName,"'(Val)"}),
% 		    []
% 	    end,
% 	    case more_genfields(Fields,Rest) of
% 		true ->
% 		    emit({";",nl});
% 		false ->
% 		    emit({".",nl})
% 	    end,
% 	    CAcc;
% 	{false,objectfield} ->
% 	    emit({"'enc_",ObjName,"'(",{asis,FieldName},
% 		  ", Val, [H|T]) ->",nl}),
% 	    case Type#typedef.name of
% 		{ExtMod,TypeName} ->
% 		    emit({indent(3),"'",ExtMod,"':'enc_",TypeName,
% 			  "'(H, Val, T)"});
% 		TypeName ->
% 		    emit({indent(3),"'enc_",TypeName,"'(H, Val, T)"})
% 	    end,
% 	    case more_genfields(Fields,Rest) of
% 		true ->
% 		    emit({";",nl});
% 		false ->
% 		    emit({".",nl})
% 	    end,
% 	    [];
% 	{false,_} -> []
%     end,
%     gen_encode_objectfields(Class,ObjName,Rest,MaybeConstr ++ ConstrAcc);
% gen_encode_objectfields(C,O,[H|T],Acc) ->
%     gen_encode_objectfields(C,O,T,Acc);
% gen_encode_objectfields(_,_,[],Acc) ->
%     Acc.

% gen_encode_constr_type(Erules,[{Name,Def}|Rest]) ->
%     emit({Name,"(Val) ->",nl}),
%     InnerType = asn1ct_gen:get_inner(Def#type.def),
%     asn1ct_gen:gen_encode_constructed(Erules,Name,InnerType,Def),
%     gen_encode_constr_type(Erules,Rest);
gen_encode_constr_type(Erules,[TypeDef|Rest]) when record(TypeDef,typedef) ->
    case is_already_generated(enc,TypeDef#typedef.name) of
	true -> ok;
	_ ->
	    Name = lists:concat(["enc_",TypeDef#typedef.name]),
	    emit({Name,"(Val) ->",nl}),
	    Def = TypeDef#typedef.typespec,
	    InnerType = asn1ct_gen:get_inner(Def#type.def),
	    asn1ct_gen:gen_encode_constructed(Erules,Name,InnerType,Def),
	    gen_encode_constr_type(Erules,Rest)
    end;
gen_encode_constr_type(_,[]) ->
    ok.

gen_encode_field_call(ObjName,FieldName,Type) ->
    Def = Type#typedef.typespec,
    case Type#typedef.name of
	{primitive,bif} -> 
	    gen_encode_prim(per,Def,"false",
			    "Val"),
	    [];
	{constructed,bif} ->
	    emit({"   'enc_",ObjName,'_',FieldName,
		  "'(Val)"}),
	    [Type#typedef{name=list_to_atom(lists:concat([ObjName,'_',FieldName]))}];
	{ExtMod,TypeName} ->
	    emit({"   '",ExtMod,"':'enc_",TypeName,
		  "'(Val)"}),
	    [];
	TypeName ->
	    emit({"   'enc_",TypeName,"'(Val)"}),
	    []
    end.

gen_encode_default_call(ClassName,FieldName,Type) ->
    CurrentMod = get(currmod),
    InnerType = asn1ct_gen:get_inner(Type#type.def),
    case asn1ct_gen:type(InnerType) of
    	{constructed,bif} ->
%%	    asn1ct_gen:gen_encode_constructed(Erules,Typename,InnerType,Type);
	    emit(["   'enc_",ClassName,'_',FieldName,"'(Val)"]),
	    [#typedef{name=list_to_atom(lists:concat([ClassName,'_',FieldName])),
		      typespec=Type}];
	{primitive,bif} ->
	    gen_encode_prim(per,Type,"false","Val"),
	    [];
	#'Externaltypereference'{module=CurrentMod,type=Etype} ->
	    emit(["   'enc_",Etype,"'(Val)",nl]),
	    [];
	#'Externaltypereference'{module=Emod,type=Etype} ->
	    emit(["   '",Emod,"':'enc_",Etype,"'(Val)",nl]),
	    []
    end.
    

gen_decode_objectfields(ClassName,[{typefield,Name,OptOrMand}|Rest],
			ObjName,ObjectFields,ConstrAcc) ->
    EmitFuncClause = 
	fun(Bytes) ->
		emit(["'dec_",ObjName,"'(",{asis,Name},",",Bytes,
		      ",_,_RestPrimFieldName) ->",nl])
	end,
    MaybeConstr=
	case {get_object_field(Name,ObjectFields),OptOrMand} of
	    {false,'MANDATORY'} -> %% this case is illegal
		exit({error,{asn1,{"missing mandatory field in object",
				   ObjName}}});
	    {false,'OPTIONAL'} ->
		EmitFuncClause("_"),
		emit(["   asn1_NOVALUE"]),
		[];
	    {false,{'DEFAULT',DefaultType}} ->
		EmitFuncClause("Bytes"),
		gen_decode_default_call(ClassName,Name,"Bytes",DefaultType);
	    {{Name,TypeSpec},_} ->
		%% A specified field owerwrites any 'DEFAULT' or
		%% 'OPTIONAL' field in the class
		EmitFuncClause("Bytes"),
		gen_decode_field_call(ObjName,Name,"Bytes",TypeSpec)
	end,
    case more_genfields(Rest) of
	true ->
	    emit([";",nl]);
	false ->
	    emit([".",nl])
    end,
    gen_decode_objectfields(ClassName,Rest,ObjName,ObjectFields,MaybeConstr++ConstrAcc);
gen_decode_objectfields(ClassName,[{objectfield,Name,_,_,OptOrMand}|Rest],
			ObjName,ObjectFields,ConstrAcc) ->
    EmitFuncClause =
	fun(Attrs) ->
		emit(["'dec_",ObjName,"'(",{asis,Name},
		      ",",Attrs,") ->",nl])
	end,
%     emit(["'dec_",ObjName,"'(",{asis,Name},
% 	  ", Bytes,_,[H|T]) ->",nl]),
    case {get_object_field(Name,ObjectFields),OptOrMand} of
	{false,'MANDATORY'} ->
	    exit({error,{asn1,{"missing mandatory field in object",
			       ObjName}}});
	{false,'OPTIONAL'} ->
	    EmitFuncClause("_,_,_"),
	    emit(["  exit({error,{'illegal use of missing field in object', ",Name,
		  "}})"]);
	{false,{'DEFAULT',_DefaultObject}} ->
	    exit({error,{asn1,{"not implemented yet",Name}}});
	{{Name,TypeSpec},_} ->
	    EmitFuncClause("Bytes,_,[H|T]"),
	    case TypeSpec#typedef.name of
		{ExtMod,TypeName} ->
		    emit({indent(3),"'",ExtMod,"':'dec_",TypeName,
			  "'(H, Bytes, telltype, T)"});
		TypeName ->
		    emit({indent(3),"'dec_",TypeName,"'(H, Bytes, telltype, T)"})
	    end
    end,
    case more_genfields(Rest) of
	true ->
	    emit([";",nl]);
	false ->
	    emit([".",nl])
    end,
    gen_decode_objectfields(ClassName,Rest,ObjName,ObjectFields,ConstrAcc);
gen_decode_objectfields(CN,[_C|Cs],O,OF,CAcc) ->
    gen_decode_objectfields(CN,Cs,O,OF,CAcc);
gen_decode_objectfields(_,[],_,_,CAcc) ->
    CAcc.


% gen_decode_objectfields(Class,ObjName,[{FieldName,Type}|Rest],ConstrAcc) ->
%     Fields = Class#objectclass.fields,

%     MaybeConstr =
%     case is_typefield(Fields,FieldName) of
% 	true ->
% 	    Def = Type#typedef.typespec,
% 	    emit({"'dec_",ObjName,"'(",{asis,FieldName},
% 		  ", Val, Telltype, RestPrimFieldName) ->",nl}),

% 	    CAcc =
% 	    case Type#typedef.name of
% 		{primitive,bif} ->
% 		    gen_dec_prim(per,Def,"Val"),
% 		    [];
% 		{constructed,bif} ->
% 		    emit({"   'dec_",ObjName,'_',FieldName,
% 			  "'(Val, Telltype)"}),
% 		    [{['dec_',ObjName,'_',FieldName],Def}];
% 		{ExtMod,TypeName} ->
% 		    emit({"   '",ExtMod,"':'dec_",TypeName,
% 			  "'(Val, Telltype)"}),
% 		    [];
% 		TypeName ->
% 		    emit({"   'dec_",TypeName,"'(Val, Telltype)"}),
% 		    []
% 	    end,
% 	    case more_genfields(Fields,Rest) of
% 		true ->
% 		    emit({";",nl});
% 		false ->
% 		    emit({".",nl})
% 	    end,
% 	    CAcc;
% 	{false,objectfield} ->
% 	    emit({"'dec_",ObjName,"'(",{asis,FieldName},
% 		  ", Val, Telltype, [H|T]) ->",nl}),
% 	    case Type#typedef.name of
% 		{ExtMod,TypeName} ->
% 		    emit({indent(3),"'",ExtMod,"':'dec_",TypeName,
% 			  "'(H, Val, Telltype, T)"});
% 		TypeName ->
% 		    emit({indent(3),"'dec_",TypeName,
% 			  "'(H, Val, Telltype, T)"})
% 	    end,
% 	    case more_genfields(Fields,Rest) of
% 		true ->
% 		    emit({";",nl});
% 		false ->
% 		    emit({".",nl})
% 	    end,
% 	    [];
% 	{false,_} ->
% 	    []
%     end,
%     gen_decode_objectfields(Class,ObjName,Rest,MaybeConstr ++ ConstrAcc);
% gen_decode_objectfields(C,O,[H|T],CAcc) ->
%     gen_decode_objectfields(C,O,T,CAcc);
% gen_decode_objectfields(_,_,[],CAcc) ->
%     CAcc.


gen_decode_field_call(ObjName,FieldName,Bytes,Type) ->
    Def = Type#typedef.typespec,
    case Type#typedef.name of
	{primitive,bif} -> 
	    gen_dec_prim(per,Def,Bytes),
	    [];
	{constructed,bif} ->
	    emit({"   'dec_",ObjName,'_',FieldName,
		  "'(",Bytes,",telltype)"}),
	    [Type#typedef{name=list_to_atom(lists:concat([ObjName,'_',FieldName]))}];
	{ExtMod,TypeName} ->
	    emit({"   '",ExtMod,"':'dec_",TypeName,
		  "'(",Bytes,", telltype)"}),
	    [];
	TypeName ->
	    emit({"   'dec_",TypeName,"'(",Bytes,", telltype)"}),
	    []
    end.

gen_decode_default_call(ClassName,FieldName,Bytes,Type) ->
    CurrentMod = get(currmod),
    InnerType = asn1ct_gen:get_inner(Type#type.def),
    case asn1ct_gen:type(InnerType) of
    	{constructed,bif} ->
	    emit(["   'dec_",ClassName,'_',FieldName,"'(",Bytes,", telltype)"]),
	    [#typedef{name=list_to_atom(lists:concat([ClassName,'_',FieldName])),
		      typespec=Type}];
	{primitive,bif} ->
	    gen_dec_prim(per,Type,Bytes),
	    [];
	#'Externaltypereference'{module=CurrentMod,type=Etype} ->
	    emit(["   'dec_",Etype,"'(",Bytes,", telltype)",nl]),
	    [];
	#'Externaltypereference'{module=Emod,type=Etype} ->
	    emit(["   '",Emod,"':'dec_",Etype,"'(",Bytes,", telltype)",nl]),
	    []
    end.


gen_decode_constr_type(Erules,[{Name,Def}|Rest]) ->
    emit({Name,"(Bytes,_) ->",nl}),
    InnerType = asn1ct_gen:get_inner(Def#type.def),
    asn1ct_gen:gen_decode_constructed(Erules,Name,InnerType,Def),
    gen_decode_constr_type(Erules,Rest);
gen_decode_constr_type(Erules,[TypeDef|Rest]) when record(TypeDef,typedef) ->
    case is_already_generated(dec,TypeDef#typedef.name) of
	true -> ok;
	_ ->
	    gen_decode(Erules,TypeDef)
    end,
    gen_decode_constr_type(Erules,Rest);
gen_decode_constr_type(_,[]) ->
    ok.

% more_genfields(Fields,[]) ->
%     false;
% more_genfields(Fields,[{FieldName,_}|T]) ->
%     case is_typefield(Fields,FieldName) of
% 	true -> true;
% 	{false,objectfield} -> true;
% 	{false,_} -> more_genfields(Fields,T)
%     end.

more_genfields([]) ->
    false;
more_genfields([Field|Fields]) ->
    case element(1,Field) of
	typefield ->
	    true;
	objectfield ->
	    true;
	_ ->
	    more_genfields(Fields)
    end.

% is_typefield(Fields,FieldName) ->
%     case lists:keysearch(FieldName,2,Fields) of
% 	{value,Field} ->
% 	    case element(1,Field) of
% 		typefield ->
% 		    true;
% 		Other ->
% 		    {false,Other}
% 	    end;
% 	_ ->
% 	    false
%     end.
%% Object Set code generating for encoding and decoding
%% ----------------------------------------------------
gen_objectset_code(Erules,ObjSet) ->
    ObjSetName = ObjSet#typedef.name,
    Def = ObjSet#typedef.typespec,
%%    {ClassName,ClassDef} = Def#'ObjectSet'.class,
    #'Externaltypereference'{module=ClassModule,
			     type=ClassName} = Def#'ObjectSet'.class,
    ClassDef = asn1_db:dbget(ClassModule,ClassName),
    UniqueFName = Def#'ObjectSet'.uniquefname,
    Set = Def#'ObjectSet'.set,
    emit({nl,nl,nl,"%%================================"}),
    emit({nl,"%%  ",ObjSetName}),
    emit({nl,"%%================================",nl}),
    case ClassName of
	{_Module,ExtClassName} ->
	    gen_objset_code(Erules,ObjSetName,UniqueFName,Set,
			    ExtClassName,ClassDef);
	_ ->
	    gen_objset_code(Erules,ObjSetName,UniqueFName,Set,
			    ClassName,ClassDef)
    end,
    emit(nl).

gen_objset_code(Erules,ObjSetName,UniqueFName,Set,ClassName,ClassDef)->
    ClassFields = (ClassDef#classdef.typespec)#objectclass.fields,
    InternalFuncs=
	gen_objset_enc(ObjSetName,UniqueFName,Set,ClassName,ClassFields,1,[]),
    gen_objset_dec(ObjSetName,UniqueFName,Set,ClassName,ClassFields,1),
    gen_internal_funcs(Erules,InternalFuncs).

%% gen_objset_enc iterates over the objects of the object set
gen_objset_enc(_,{unique,undefined},_,_,_,_,_) ->
    %% There is no unique field in the class of this object set
    %% don't bother about the constraint
    [];
gen_objset_enc(ObjSName,UniqueName,[{ObjName,Val,Fields},T|Rest],
	       ClName,ClFields,NthObj,Acc)->
    emit({"'getenc_",ObjSName,"'(",{asis,UniqueName},",",{asis,Val},
	  ") ->",nl}),
    {InternalFunc,NewNthObj}=
	case ObjName of
	    no_name ->
		gen_inlined_enc_funs(Fields,ClFields,ObjSName,NthObj);
	    _Other ->
		emit({"    fun 'enc_",ObjName,"'/3"}),
		{[],0}
	end,
    emit({";",nl}),
    gen_objset_enc(ObjSName,UniqueName,[T|Rest],ClName,ClFields,
		   NewNthObj,InternalFunc ++ Acc);
gen_objset_enc(ObjSetName,UniqueName,
	       [{ObjName,Val,Fields}],_ClName,ClFields,NthObj,Acc) ->

    emit({"'getenc_",ObjSetName,"'(",{asis,UniqueName},",",
	  {asis,Val},") ->",nl}),
    {InternalFunc,_}=
	case ObjName of
	    no_name ->
		gen_inlined_enc_funs(Fields,ClFields,ObjSetName,NthObj);
	    _Other ->
		emit({"    fun 'enc_",ObjName,"'/3"}),
		{[],NthObj}
	end,
    emit({".",nl,nl}),
    InternalFunc++Acc;
gen_objset_enc(ObjSetName,_UniqueName,['EXTENSIONMARK'],_ClName,
	       _ClFields,_NthObj,Acc) ->
    emit({"'getenc_",ObjSetName,"'(_, _) ->",nl}),
    emit({indent(3),"fun(_, Val, _) ->",nl}),
    emit({indent(6),"[{octets,Val}]",nl}),
    emit({indent(3),"end.",nl,nl}),
    Acc;
gen_objset_enc(_,_,[],_,_,_,Acc) ->
    Acc.

%% gen_inlined_enc_funs for each object iterates over all fields of a
%% class, and for each typefield it checks if the object has that
%% field and emits the proper code.
gen_inlined_enc_funs(Fields,[{typefield,Name,_}|Rest],ObjSetName,NthObj) ->
    InternalDefFunName = asn1ct_gen:list2name([NthObj,Name,ObjSetName]),
    case lists:keysearch(Name,1,Fields) of
	{value,{_,Type}} when record(Type,type) ->
	    emit({indent(3),"fun(Type, Val, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    {Ret,N}=emit_inner_of_fun(Type,InternalDefFunName),
	    gen_inlined_enc_funs1(Fields,Rest,ObjSetName,NthObj+N,Ret);
	{value,{_,Type}} when record(Type,typedef) ->
	    emit({indent(3),"fun(Type, Val, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    emit({indent(9),{asis,Name}," ->",nl}),
	    {Ret,N} = emit_inner_of_fun(Type,InternalDefFunName),
	    gen_inlined_enc_funs1(Fields,Rest,ObjSetName,NthObj+N,Ret);
	false ->
	    gen_inlined_enc_funs(Fields,Rest,ObjSetName,NthObj)
    end;
gen_inlined_enc_funs(Fields,[_H|Rest],ObjSetName,NthObj) ->
    gen_inlined_enc_funs(Fields,Rest,ObjSetName,NthObj);
gen_inlined_enc_funs(_,[],_,NthObj) ->
    {[],NthObj}.

gen_inlined_enc_funs1(Fields,[{typefield,Name,_}|Rest],ObjSetName,
		     NthObj,Acc) ->
    InternalDefFunName = asn1ct_gen:list2name([NthObj,Name,ObjSetName]),
    {Acc2,NAdd}=
	case lists:keysearch(Name,1,Fields) of
	    {value,{_,Type}} when record(Type,type) ->
		emit({";",nl}),
		{Ret,N}=emit_inner_of_fun(Type,InternalDefFunName),
		{Ret++Acc,N};
	    {value,{_,Type}} when record(Type,typedef) ->
		emit({";",nl,indent(9),{asis,Name}," ->",nl}),
		{Ret,N}=emit_inner_of_fun(Type,InternalDefFunName),
		{Ret++Acc,N};
	    false ->
		{Acc,0}
	end,
    gen_inlined_enc_funs1(Fields,Rest,ObjSetName,NthObj+NAdd,Acc2);
gen_inlined_enc_funs1(Fields,[_H|Rest],ObjSetName,NthObj,Acc)->
    gen_inlined_enc_funs1(Fields,Rest,ObjSetName,NthObj,Acc);
gen_inlined_enc_funs1(_,[],_,NthObj,Acc) ->
    emit({nl,indent(6),"end",nl}),
    emit({indent(3),"end"}),
    {Acc,NthObj}.

emit_inner_of_fun(TDef=#typedef{name={ExtMod,Name},typespec=Type},
		  InternalDefFunName) ->
    case {ExtMod,Name} of
	{primitive,bif} ->
	    emit(indent(12)),
	    gen_encode_prim(per,Type,dotag,"Val"),
	    {[],0};
	{constructed,bif} ->
	    emit([indent(12),"'enc_",
		  InternalDefFunName,"'(Val)"]),
	    {[TDef#typedef{name=InternalDefFunName}],1};
	_ ->
	    emit({indent(12),"'",ExtMod,"':'enc_",Name,"'(Val)"}),
	    {[],0}
    end;
emit_inner_of_fun(#typedef{name=Name},_) ->
    emit({indent(12),"'enc_",Name,"'(Val)"}),
    {[],0};
emit_inner_of_fun(Type,_) when record(Type,type) ->
    CurrMod = get(currmod),
    case Type#type.def of
	Def when atom(Def) ->
	    emit({indent(9),Def," ->",nl,indent(12)}),
	    gen_encode_prim(erules,Type,dotag,"Val");
	TRef when record(TRef,typereference) ->
	    T = TRef#typereference.val,
	    emit({indent(9),T," ->",nl,indent(12),"'enc_",T,"'(Val)"});
	#'Externaltypereference'{module=CurrMod,type=T} ->
	    emit({indent(9),T," ->",nl,indent(12),"'enc_",T,"'(Val)"});
	#'Externaltypereference'{module=ExtMod,type=T} ->
	    emit({indent(9),T," ->",nl,indent(12),ExtMod,":'enc_",
		  T,"'(Val)"})
    end,
    {[],0}.

indent(N) ->
    lists:duplicate(N,32). % 32 = space


gen_objset_dec(_,{unique,undefined},_,_,_,_) ->
    %% There is no unique field in the class of this object set
    %% don't bother about the constraint
    ok;
gen_objset_dec(ObjSName,UniqueName,[{ObjName,Val,Fields},T|Rest],ClName,
	       ClFields,NthObj)->

    emit({"'getdec_",ObjSName,"'(",{asis,UniqueName},",",{asis,Val},
	  ") ->",nl}),
    NewNthObj=
	case ObjName of
	    no_name ->
		gen_inlined_dec_funs(Fields,ClFields,ObjSName,NthObj);
	    _Other ->
		emit({"    fun 'dec_",ObjName,"'/4"}),
		NthObj
    end,
    emit({";",nl}),
    gen_objset_dec(ObjSName,UniqueName,[T|Rest],ClName,ClFields,NewNthObj);
gen_objset_dec(ObjSetName,UniqueName,[{ObjName,Val,Fields}],_ClName,
	       ClFields,NthObj) ->

    emit({"'getdec_",ObjSetName,"'(",{asis,UniqueName},",",{asis,Val},
	  ") ->",nl}),
    case ObjName of
	no_name ->
	    gen_inlined_dec_funs(Fields,ClFields,ObjSetName,NthObj);
	_Other ->
	    emit({"    fun 'dec_",ObjName,"'/4"})
    end,
    emit({".",nl,nl}),
    ok;
gen_objset_dec(ObjSetName,_UniqueName,['EXTENSIONMARK'],_ClName,_ClFields,
	      _NthObj) ->
    emit({"'getdec_",ObjSetName,"'(_, _) ->",nl}),
    emit({indent(3),"fun(Attr1, Bytes, _,_) ->",nl}),
%%    emit({indent(6),"?RT_PER:decode_open_type(Bytes,[])",nl}),
    emit({indent(6),"{Bytes,Attr1}",nl}),
    emit({indent(3),"end.",nl,nl}),
    ok;
gen_objset_dec(_,_,[],_,_,_) ->
    ok.

gen_inlined_dec_funs(Fields,[{typefield,Name,_}|Rest],
		    ObjSetName,NthObj) ->
    InternalDefFunName = [NthObj,Name,ObjSetName],
    case lists:keysearch(Name,1,Fields) of
	{value,{_,Type}} when record(Type,type) ->
	    emit({indent(3),"fun(Type, Val, _, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    N=emit_inner_of_decfun(Type,InternalDefFunName),
	    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj+N);
	{value,{_,Type}} when record(Type,typedef) ->
	    emit({indent(3),"fun(Type, Val, _, _) ->",nl,
		  indent(6),"case Type of",nl}),
	    emit({indent(9),{asis,Name}," ->",nl}),
	    N=emit_inner_of_decfun(Type,InternalDefFunName),
	    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj+N);
	false ->
	    gen_inlined_dec_funs(Fields,Rest,ObjSetName,NthObj)
    end;
gen_inlined_dec_funs(Fields,[_|Rest],ObjSetName,NthObj) ->
    gen_inlined_dec_funs(Fields,Rest,ObjSetName,NthObj);
gen_inlined_dec_funs(_,[],_,NthObj) ->
    NthObj.

gen_inlined_dec_funs1(Fields,[{typefield,Name,_}|Rest],
		      ObjSetName,NthObj) ->
    InternalDefFunName = [NthObj,Name,ObjSetName],
    N=case lists:keysearch(Name,1,Fields) of
	  {value,{_,Type}} when record(Type,type) ->
	      emit({";",nl}),
	      emit_inner_of_decfun(Type,InternalDefFunName);
	  {value,{_,Type}} when record(Type,typedef) ->
	      emit({";",nl,indent(9),{asis,Name}," ->",nl}),
	      emit_inner_of_decfun(Type,InternalDefFunName);
	  false ->
	      0
      end,
    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj+N);
gen_inlined_dec_funs1(Fields,[_|Rest],ObjSetName,NthObj)->
    gen_inlined_dec_funs1(Fields,Rest,ObjSetName,NthObj);
gen_inlined_dec_funs1(_,[],_,NthObj) ->
    emit({nl,indent(6),"end",nl}),
    emit({indent(3),"end"}),
    NthObj.

emit_inner_of_decfun(#typedef{name={ExtName,Name},typespec=Type},
		     InternalDefFunName) ->
    case {ExtName,Name} of
	{primitive,bif} ->
	    emit(indent(12)),
	    gen_dec_prim(per,Type,"Val"),
	    0;
	{constructed,bif} ->
	    emit({indent(12),"'dec_",
		  asn1ct_gen:list2name(InternalDefFunName),"'(Val)"}),
	    1;
	_ ->
	    emit({indent(12),"'",ExtName,"':'dec_",Name,"'(Val, telltype)"}),
	    0
    end;
emit_inner_of_decfun(#typedef{name=Name},_) ->
    emit({indent(12),"'dec_",Name,"'(Val, telltype)"}),
    0;
emit_inner_of_decfun(Type,_) when record(Type,type) ->
    CurrMod = get(currmod),
    case Type#type.def of
	Def when atom(Def) ->
	    emit({indent(9),Def," ->",nl,indent(12)}),
	    gen_dec_prim(erules,Type,"Val");
	TRef when record(TRef,typereference) ->
	    T = TRef#typereference.val,
	    emit({indent(9),T," ->",nl,indent(12),"'dec_",T,"'(Val)"});
	#'Externaltypereference'{module=CurrMod,type=T} ->
	    emit({indent(9),T," ->",nl,indent(12),"'dec_",T,"'(Val)"});
	#'Externaltypereference'{module=ExtMod,type=T} ->
	    emit({indent(9),T," ->",nl,indent(12),ExtMod,":'dec_",
		  T,"'(Val)"})
    end,
    0.


gen_internal_funcs(_,[]) ->
    ok;
gen_internal_funcs(Erules,[TypeDef|Rest]) ->
    gen_encode_user(Erules,TypeDef),
    emit([nl,nl,"'dec_",TypeDef#typedef.name,"'(Bytes) ->",nl]),
    gen_decode_user(Erules,TypeDef),
    gen_internal_funcs(Erules,Rest).



%% DECODING *****************************
%%***************************************


gen_decode(Erules,Type) when record(Type,typedef) ->
    D = Type,
    emit({nl,nl}),
    emit({"'dec_",Type#typedef.name,"'(Bytes,_) ->",nl}),
    dbdec(Type#typedef.name),
    gen_decode_user(Erules,D).

gen_decode(Erules,Tname,#'ComponentType'{name=Cname,typespec=Type}) ->
    NewTname = [Cname|Tname],
    gen_decode(Erules,NewTname,Type);

gen_decode(Erules,Typename,Type) when record(Type,type) ->
    InnerType = asn1ct_gen:get_inner(Type#type.def),
    case asn1ct_gen:type(InnerType) of
	{constructed,bif} ->
	    ObjFun =
		case Type#type.tablecinf of
		    [{objfun,_}|_R] ->
			", ObjFun";
		    _ ->
			""
		end,
	    emit({nl,"'dec_",asn1ct_gen:list2name(Typename),
		  "'(Bytes,_",ObjFun,") ->",nl}),
	    dbdec(Typename),
	    asn1ct_gen:gen_decode_constructed(Erules,Typename,InnerType,Type);
	_ ->
	    true
    end.

dbdec(Type) when list(Type)->
    demit({"io:format(\"decoding: ",asn1ct_gen:list2name(Type),"~w~n\",[Bytes]),",nl});
dbdec(Type) ->
    demit({"io:format(\"decoding: ",{asis,Type},"~w~n\",[Bytes]),",nl}).

gen_decode_user(Erules,D) when record(D,typedef) ->
    CurrMod = get(currmod),
    Typename = [D#typedef.name],
    Def = D#typedef.typespec,
    InnerType = asn1ct_gen:get_inner(Def#type.def),
    case asn1ct_gen:type(InnerType) of
	{primitive,bif} ->
	    gen_dec_prim(Erules,Def,"Bytes"),
	    emit({".",nl,nl});
	'ASN1_OPEN_TYPE' ->
	    gen_dec_prim(Erules,Def#type{def='ASN1_OPEN_TYPE'},"Bytes"),
	    emit({".",nl,nl});
	{constructed,bif} ->
	    asn1ct_gen:gen_decode_constructed(Erules,Typename,InnerType,D);
	#typereference{val=Dname} ->
	    emit({"'dec_",Dname,"'(Bytes,telltype)"}),
	    emit({".",nl,nl});
	#'Externaltypereference'{module=CurrMod,type=Etype} ->
	    emit({"'dec_",Etype,"'(Bytes,telltype).",nl,nl});
	#'Externaltypereference'{module=Emod,type=Etype} ->
	    emit({"'",Emod,"':'dec_",Etype,"'(Bytes,telltype).",nl,nl});
	Other ->
	    exit({error,{asn1,{unknown,Other}}})
    end.


gen_dec_prim(_Erules,Att,BytesVar) ->
    Typename = Att#type.def,
    Constraint = Att#type.constraint,
    case Typename of
	'INTEGER' ->
	    emit({"?RT_PER:decode_integer(",BytesVar,",",
		  {asis,Constraint},")"});
	{'INTEGER',NamedNumberList} ->
	    emit({"?RT_PER:decode_integer(",BytesVar,",",
		  {asis,Constraint},",",
		  {asis,NamedNumberList},")"});
	{'BIT STRING',NamedNumberList} ->
	    case get(compact_bit_string) of
		true ->
		    emit({"?RT_PER:decode_compact_bit_string(",
			  BytesVar,",",{asis,Constraint},",",
			  {asis,NamedNumberList},")"});
		_ ->
		    emit({"?RT_PER:decode_bit_string(",BytesVar,",",
			  {asis,Constraint},",",
			  {asis,NamedNumberList},")"})
	    end;
	'NULL' ->
	    emit({"?RT_PER:decode_null(",
		  BytesVar,")"});
	'OBJECT IDENTIFIER' ->
	    emit({"?RT_PER:decode_object_identifier(",
		  BytesVar,")"});
	'ObjectDescriptor' ->
	    emit({"?RT_PER:decode_ObjectDescriptor(",
		  BytesVar,")"});
	{'ENUMERATED',{NamedNumberList1,NamedNumberList2}} ->
	    NewTup = {list_to_tuple([X||{X,_} <- NamedNumberList1]),
		      list_to_tuple([X||{X,_} <- NamedNumberList2])},
	    NewC = [{'ValueRange',{0,size(element(1,NewTup))-1}}],
	    emit({"?RT_PER:decode_enumerated(",BytesVar,",",
		  {asis,NewC},",",
		  {asis,NewTup},")"});
	{'ENUMERATED',NamedNumberList} ->
	    NewTup = list_to_tuple([X||{X,_} <- NamedNumberList]),
	    NewC = [{'ValueRange',{0,size(NewTup)-1}}],
	    emit({"?RT_PER:decode_enumerated(",BytesVar,",",
		  {asis,NewC},",",
		  {asis,NewTup},")"});
	'BOOLEAN'->
	    emit({"?RT_PER:decode_boolean(",BytesVar,")"});
	'OCTET STRING' ->
	    emit({"?RT_PER:decode_octet_string(",BytesVar,",",
		  {asis,Constraint},")"});
	'NumericString' ->
	    emit({"?RT_PER:decode_NumericString(",BytesVar,",",
		  {asis,Constraint},")"});
	'TeletexString' ->
	    emit({"?RT_PER:decode_TeletexString(",BytesVar,",",
		  {asis,Constraint},")"});
	'VideotexString' ->
	    emit({"?RT_PER:decode_VideotexString(",BytesVar,",",
		  {asis,Constraint},")"});
	'UTCTime' ->
	    emit({"?RT_PER:decode_VisibleString(",BytesVar,",",
		  {asis,Constraint},")"});
	'GeneralizedTime' ->
	    emit({"?RT_PER:decode_VisibleString(",BytesVar,",",
		  {asis,Constraint},")"});
	'GraphicString' ->
	    emit({"?RT_PER:decode_GraphicString(",BytesVar,",",
		  {asis,Constraint},")"});
	'VisibleString' ->
	    emit({"?RT_PER:decode_VisibleString(",BytesVar,",",
		  {asis,Constraint},")"});
	'GeneralString' ->
	    emit({"?RT_PER:decode_GeneralString(",BytesVar,",",
		  {asis,Constraint},")"});
	'PrintableString' ->
	    emit({"?RT_PER:decode_PrintableString(",BytesVar,",",{asis,Constraint},")"});
	'IA5String' ->
	    emit({"?RT_PER:decode_IA5String(",BytesVar,",",{asis,Constraint},")"});
	'BMPString' ->
	    emit({"?RT_PER:decode_BMPString(",BytesVar,",",{asis,Constraint},")"});
	'UniversalString' ->
	    emit({"?RT_PER:decode_UniversalString(",BytesVar,",",{asis,Constraint},")"});
	'ANY' ->
	    emit(["?RT_PER:decode_open_type(",BytesVar,",", 
		  {asis,Constraint}, ")"]); 
	'ASN1_OPEN_TYPE' ->
	    case Constraint of
		[#'Externaltypereference'{type=Tname}] ->
		    emit(["fun(FBytes) ->",nl,
			  "   {XTerm,XBytes} = "]),
		    emit(["?RT_PER:decode_open_type(FBytes,[]),",nl]),
		    emit(["   {YTerm,_} = dec_",Tname,"(XTerm,mandatory),",nl]),
		    emit(["   {YTerm,XBytes} end(",BytesVar,")"]);
		[#type{def=#'Externaltypereference'{type=Tname}}] ->
		    emit(["fun(FBytes) ->",nl,
			  "   {XTerm,XBytes} = "]),
		    emit(["?RT_PER:decode_open_type(FBytes,[]),",nl]),
		    emit(["   {YTerm,_} = dec_",Tname,"(XTerm,mandatory),",nl]),
		    emit(["   {YTerm,XBytes} end(",BytesVar,")"]);
		_ ->
		    emit(["?RT_PER:decode_open_type(",BytesVar,",[])"])
	    end;
	Other ->
	    exit({'cant decode' ,Other})
    end.


is_already_generated(Operation,Name) ->
    case get(class_default_type) of
	undefined ->
	    put(class_default_type,[{Operation,Name}]),
	    false;
	GeneratedList ->
	    case lists:member({Operation,Name},GeneratedList) of
		true ->
		    true;
		false ->
		    put(class_default_type,[{Operation,Name}|GeneratedList]),
		    false
	    end
    end.

get_class_fields(#classdef{typespec=ObjClass}) ->
    ObjClass#objectclass.fields;
get_class_fields(#objectclass{fields=Fields}) ->
    Fields;
get_class_fields(_) ->
    [].


get_object_field(Name,ObjectFields) ->
    case lists:keysearch(Name,1,ObjectFields) of
	{value,Field} -> Field;
	false -> false
    end.

