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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /lib/asn1/src/asn1ct_name.erl
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The R13B03 release.OTP_R13B03
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diff --git a/lib/asn1/src/asn1ct_name.erl b/lib/asn1/src/asn1ct_name.erl
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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 1997-2009. All Rights Reserved.
+%%
+%% 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 online 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.
+%%
+%% %CopyrightEnd%
+%%
+%%
+-module(asn1ct_name).
+
+%%-compile(export_all).
+-export([name_server_loop/1,
+ start/0,
+ stop/0,
+ push/1,
+ pop/1,
+ curr/1,
+ clear/0,
+ delete/1,
+ active/1,
+ prev/1,
+ next/1,
+ all/1,
+ new/1]).
+
+start() ->
+ start_server(asn1_ns, asn1ct_name,name_server_loop,[[]]).
+
+stop() -> stop_server(asn1_ns).
+
+name_server_loop(Vars) ->
+%% io:format("name -- ~w~n",[Vars]),
+ receive
+ {From,{current,Variable}} ->
+ From ! {asn1_ns,get_curr(Vars,Variable)},
+ name_server_loop(Vars);
+ {From,{pop,Variable}} ->
+ From ! {asn1_ns,done},
+ name_server_loop(pop_var(Vars,Variable));
+ {From,{push,Variable}} ->
+ From ! {asn1_ns,done},
+ name_server_loop(push_var(Vars,Variable));
+ {From,{delete,Variable}} ->
+ From ! {asn1_ns,done},
+ name_server_loop(delete_var(Vars,Variable));
+ {From,{new,Variable}} ->
+ From ! {asn1_ns,done},
+ name_server_loop(new_var(Vars,Variable));
+ {From,{prev,Variable}} ->
+ From ! {asn1_ns,get_prev(Vars,Variable)},
+ name_server_loop(Vars);
+ {From,{next,Variable}} ->
+ From ! {asn1_ns,get_next(Vars,Variable)},
+ name_server_loop(Vars);
+ {From,stop} ->
+ unregister(asn1_ns),
+ From ! {asn1_ns,stopped},
+ exit(normal)
+ end.
+
+active(V) ->
+ case curr(V) of
+ nil -> false;
+ _ -> true
+ end.
+
+req(Req) ->
+ asn1_ns ! {self(), Req},
+ receive {asn1_ns, Reply} -> Reply end.
+
+pop(V) -> req({pop,V}).
+push(V) -> req({push,V}).
+clear() -> req(stop), start().
+curr(V) -> req({current,V}).
+new(V) -> req({new,V}).
+delete(V) -> req({delete,V}).
+prev(V) ->
+ case req({prev,V}) of
+ none ->
+ exit('cant get prev of none');
+ Rep -> Rep
+ end.
+
+next(V) ->
+ case req({next,V}) of
+ none ->
+ exit('cant get next of none');
+ Rep -> Rep
+ end.
+
+all(V) ->
+ Curr = curr(V),
+ if Curr == V -> [];
+ true ->
+ lists:reverse(generate(V,last(Curr),[],0))
+ end.
+
+generate(V,Number,Res,Pos) ->
+ Ell = Pos+1,
+ if
+ Ell > Number ->
+ Res;
+ true ->
+ generate(V,Number,[list_to_atom(lists:concat([V,Ell]))|Res],Ell)
+ end.
+
+last(V) ->
+ last2(lists:reverse(atom_to_list(V))).
+
+last2(RevL) ->
+ list_to_integer(lists:reverse(get_digs(RevL))).
+
+
+get_digs([H|T]) ->
+ if
+ H < $9+1,
+ H > $0-1 ->
+ [H|get_digs(T)];
+ true ->
+ []
+ end.
+
+push_var(Vars,Variable) ->
+ case lists:keysearch(Variable,1,Vars) of
+ false ->
+ [{Variable,[0]}|Vars];
+ {value,{Variable,[Digit|Drest]}} ->
+ NewVars = lists:keydelete(Variable,1,Vars),
+ [{Variable,[Digit,Digit|Drest]}|NewVars]
+ end.
+
+pop_var(Vars,Variable) ->
+ case lists:keysearch(Variable,1,Vars) of
+ false ->
+ ok;
+ {value,{Variable,[_Dig]}} ->
+ lists:keydelete(Variable,1,Vars);
+ {value,{Variable,[_Dig|Digits]}} ->
+ NewVars = lists:keydelete(Variable,1,Vars),
+ [{Variable,Digits}|NewVars]
+ end.
+
+get_curr([],Variable) ->
+ Variable;
+get_curr([{Variable,[0|_Drest]}|_Tail],Variable) ->
+ Variable;
+get_curr([{Variable,[Digit|_Drest]}|_Tail],Variable) ->
+ list_to_atom(lists:concat([Variable,integer_to_list(Digit)]));
+
+get_curr([_|Tail],Variable) ->
+ get_curr(Tail,Variable).
+
+new_var(Vars,Variable) ->
+ case lists:keysearch(Variable,1,Vars) of
+ false ->
+ [{Variable,[1]}|Vars];
+ {value,{Variable,[Digit|Drest]}} ->
+ NewVars = lists:keydelete(Variable,1,Vars),
+ [{Variable,[Digit+1|Drest]}|NewVars]
+ end.
+
+delete_var(Vars,Variable) ->
+ case lists:keysearch(Variable,1,Vars) of
+ false ->
+ Vars;
+ {value,{Variable,[N]}} when N =< 1 ->
+ lists:keydelete(Variable,1,Vars);
+ {value,{Variable,[Digit|Drest]}} ->
+ case Digit of
+ 0 ->
+ Vars;
+ _ ->
+ NewVars = lists:keydelete(Variable,1,Vars),
+ [{Variable,[Digit-1|Drest]}|NewVars]
+ end
+ end.
+
+get_prev(Vars,Variable) ->
+ case lists:keysearch(Variable,1,Vars) of
+ false ->
+ none;
+ {value,{Variable,[Digit|_]}} when Digit =< 1 ->
+ Variable;
+ {value,{Variable,[Digit|_]}} when Digit > 1 ->
+ list_to_atom(lists:concat([Variable,
+ integer_to_list(Digit-1)]));
+ _ ->
+ none
+ end.
+
+get_next(Vars,Variable) ->
+ case lists:keysearch(Variable,1,Vars) of
+ false ->
+ list_to_atom(lists:concat([Variable,"1"]));
+ {value,{Variable,[Digit|_]}} when Digit >= 0 ->
+ list_to_atom(lists:concat([Variable,
+ integer_to_list(Digit+1)]));
+ _ ->
+ none
+ end.
+
+
+stop_server(Name) ->
+ stop_server(Name, whereis(Name)).
+stop_server(_Name, undefined) -> stopped;
+stop_server(Name, _Pid) ->
+ Name ! {self(), stop},
+ receive {Name, _} -> stopped end.
+
+
+start_server(Name,Mod,Fun,Args) ->
+ case whereis(Name) of
+ undefined ->
+ case catch register(Name, spawn(Mod,Fun, Args)) of
+ {'EXIT',{badarg,_}} ->
+ start_server(Name,Mod,Fun,Args);
+ _ ->
+ ok
+ end;
+ _Pid ->
+ already_started
+ end.