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+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2010-2011. 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%
+%%
+
+%%
+%% This module turns a dictionary file into the orddict that
+%% diameter_codegen.erl in turn morphs into .erl and .hrl files for
+%% encode and decode of Diameter messages and AVPs.
+%%
+
+-module(diameter_dict_util).
+
+-export([parse/2,
+ format_error/1]).
+
+-include("diameter_vsn.hrl").
+
+-define(RETURN(T), throw({T, ?MODULE, ?LINE})).
+-define(RETURN(T, Args), ?RETURN({T, Args})).
+
+-define(A, list_to_atom).
+-define(L, atom_to_list).
+
+%% ===========================================================================
+%% parse/2
+%% ===========================================================================
+
+-spec parse(File, Opts)
+ -> {ok, orddict:orddict()}
+ | {error, term()}
+ when File :: {path, string()}
+ | string()
+ | binary(),
+ Opts :: list().
+
+parse(File, Opts) ->
+ put({?MODULE, verbose}, lists:member(verbose, Opts)),
+ try
+ {ok, do_parse(File, Opts)}
+ catch
+ {Reason, ?MODULE, _Line} ->
+ {error, Reason}
+ after
+ erase({?MODULE, verbose})
+ end.
+
+%% ===========================================================================
+%% format_error/1
+%% ===========================================================================
+
+format_error({read, Reason}) ->
+ file:format_error(Reason);
+format_error({scan, Reason}) ->
+ diameter_dict_scanner:format_error(Reason);
+format_error({parse, {Line, _Mod, Reason}}) ->
+ lists:flatten(["Line ", integer_to_list(Line), ", ", Reason]);
+
+format_error(T) ->
+ {Fmt, As} = fmt(T),
+ lists:flatten(io_lib:format(Fmt, As)).
+
+fmt({avp_code_already_defined, [Code, false, Name, Line, L]}) ->
+ {"AVP ~p (~s) at line ~p already defined at line ~p",
+ [Code, Name, Line, L]};
+
+fmt({Reason, As}) ->
+ {fmt(Reason), As};
+
+fmt(avp_code_already_defined) ->
+ "AVP ~p/~p (~s) at line ~p already defined at line ~p";
+
+fmt(imported_avp_already_defined) ->
+ "AVP ~s imported by @inherits ~p at line ~p defined at line ~p";
+fmt(duplicate_import) ->
+ "AVP ~s is imported by more than one @inherits, both at line ~p "
+ "and at line ~p";
+
+fmt(duplicate_section) ->
+ "Section @~s at line ~p already declared at line ~p";
+
+fmt(already_declared) ->
+ "Section @~p ~s at line ~p already declared at line ~p";
+
+fmt(inherited_avp_already_defined) ->
+ "AVP ~s inherited at line ~p defined in @avp_types at line ~p";
+fmt(avp_already_defined) ->
+ "AVP ~s at line ~p already in @~p at line ~p";
+fmt(key_already_defined) ->
+ "Value for ~s:~s in @~p at line ~p already provided at line ~p";
+
+fmt(messages_without_id) ->
+ "@messages at line ~p but @id not declared";
+
+fmt(avp_name_already_defined) ->
+ "AVP ~s at line ~p already defined at line ~p";
+fmt(avp_has_unknown_type) ->
+ "AVP ~s at line ~p defined with unknown type ~s";
+fmt(avp_has_invalid_flag) ->
+ "AVP ~s at line ~p specifies invalid flag ~c";
+fmt(avp_has_duplicate_flag) ->
+ "AVP ~s at line ~p specifies duplicate flag ~c";
+fmt(avp_has_vendor_id) ->
+ "AVP ~s at line ~p does not specify V flag "
+ "but is assigned vendor id ~p at line ~p";
+fmt(avp_has_no_vendor) ->
+ "AVP ~s at line ~p specifies V flag "
+ "but neither @vendor_avp_id nor @vendor supplies a value";
+
+fmt(group_already_defined) ->
+ "Group ~s at line ~p already defined at line ~p";
+fmt(grouped_avp_code_mismatch) ->
+ "AVP ~s at line ~p has with code ~p "
+ "but @avp_types specifies ~p at line ~p";
+fmt(grouped_avp_has_wrong_type) ->
+ "Grouped AVP ~s at line ~p defined with type ~s at line ~p";
+fmt(grouped_avp_not_defined) ->
+ "Grouped AVP ~s on line ~p not defined in @avp_types";
+fmt(grouped_vendor_id_without_flag) ->
+ "Grouped AVP ~s at line ~p has vendor id "
+ "but definition at line ~p does not specify V flag";
+fmt(grouped_vendor_id_mismatch) ->
+ "Grouped AVP ~s at line ~p has vendor id ~p "
+ "but ~p specified at line ~p";
+
+fmt(message_name_already_defined) ->
+ "Message ~s at line ~p already defined at line ~p";
+fmt(message_code_already_defined) ->
+ "~s message with code ~p at line ~p already defined at line ~p";
+fmt(message_has_duplicate_flag) ->
+ "Message ~s has duplicate flag ~s at line ~p";
+fmt(message_application_id_mismatch) ->
+ "Message ~s has application id ~p at line ~p "
+ "but @id specifies ~p at line ~p";
+
+fmt(invalid_avp_order) ->
+ "AVP reference ~c~s~c at line ~p breaks fixed/required/optional order";
+fmt(invalid_qualifier) ->
+ "Qualifier ~p*~p at line ~p has Min > Max";
+fmt(avp_already_referenced) ->
+ "AVP ~s at line ~p already referenced at line ~p";
+
+fmt(message_missing) ->
+ "~s message at line ~p but no ~s message is defined";
+
+fmt(requested_avp_not_found) ->
+ "@inherit ~s at line ~p requests AVP ~s at line ~p "
+ "but module does not define that AVP";
+
+fmt(enumerated_avp_has_wrong_local_type) ->
+ "Enumerated AVP ~s in @enum at line ~p defined with type ~s at line ~p";
+fmt(enumerated_avp_has_wrong_inherited_type) ->
+ "Enumerated AVP ~s in @enum at line ~p "
+ "inherited with type ~s from module ~s at line ~p";
+fmt(enumerated_avp_not_defined) ->
+ "Enumerated AVP ~s in @enum at line ~p neither defined nor inherited";
+
+fmt(avp_not_defined) ->
+ "AVP ~s referenced at line ~p neither defined nor inherited";
+
+fmt(beam_not_on_path) ->
+ "Module ~s not found";
+
+fmt(recompile) ->
+ "Module ~p appears to have been compiler with an incompatible "
+ "version of the dictionary compiler and must be recompiled";
+fmt(no_dict) ->
+ "Module ~p does not appear to be a diameter dictionary".
+
+%% ===========================================================================
+%% ===========================================================================
+
+do_parse(File, Opts) ->
+ Bin = do([fun read/1, File], read),
+ Toks = do([fun diameter_dict_scanner:scan/1, Bin], scan),
+ Tree = do([fun diameter_dict_parser:parse/1, Toks], parse),
+ make_dict(Tree, Opts).
+
+do([F|A], E) ->
+ case apply(F,A) of
+ {ok, T} ->
+ T;
+ {error, Reason} ->
+ ?RETURN({E, Reason})
+ end.
+
+read({path, Path}) ->
+ file:read_file(Path);
+read(File) ->
+ {ok, File}.
+
+make_dict(Parse, Opts) ->
+ make_orddict(pass4(pass3(pass2(pass1(reset(make_dict(Parse),
+ Opts))),
+ Opts))).
+
+%% make_orddict/1
+
+make_orddict(Dict) ->
+ dict:fold(fun mo/3,
+ orddict:from_list([{K,[]} || K <- [avp_types,
+ messages,
+ grouped,
+ inherits,
+ custom_types,
+ codecs,
+ avp_vendor_id,
+ enum,
+ define]]),
+ Dict).
+
+mo(K, Sects, Dict)
+ when is_atom(K) ->
+ orddict:store(K, make(K, Sects), Dict);
+
+mo(_, _, Dict) ->
+ Dict.
+
+make(K, [[_Line, {_, _, X}]])
+ when K == id;
+ K == name;
+ K == prefix ->
+ X;
+
+make(vendor, [[_Line, {_, _, Id}, {_, _, Name}]]) ->
+ {Id, Name};
+
+make(K, T)
+ when K == command_codes;
+ K == import_avps;
+ K == import_groups;
+ K == import_enums ->
+ T;
+
+make(K, Sects) ->
+ post(K, foldl(fun([_L|B], A) -> make(K,B,A) end,
+ [],
+ Sects)).
+
+post(avp_types, L) ->
+ lists:sort(L);
+
+post(K, L)
+ when K == grouped;
+ K == messages;
+ K == enum;
+ K == define ->
+ lists:reverse(L);
+
+post(_, L) ->
+ L.
+
+make(K, [{_,_,Name} | Body], Acc)
+ when K == enum;
+ K == define;
+ K == avp_vendor_id;
+ K == custom_types;
+ K == inherits;
+ K == codecs ->
+ [{Name, mk(K, Body)} | Acc];
+
+make(K, Body, Acc) ->
+ foldl(fun(T,A) -> [mk(K, T) | A] end, Acc, Body).
+
+mk(avp_types, [{_,_,Name}, {_,_,Code}, {_,_,Type}, {_,_,Flags}]) ->
+ {Name, Code, type(Type), Flags};
+
+mk(messages, [{'answer-message' = A, _}, false | Avps]) ->
+ {?L(A), -1, ['ERR', 'PXY'], [], make_body(Avps)};
+
+mk(messages, [{_,_,Name}, [{_,_,Code}, Flags, ApplId] | Avps]) ->
+ {Name,
+ Code,
+ lists:map(fun({F,_}) -> F end, Flags),
+ opt(ApplId),
+ make_body(Avps)};
+
+mk(grouped, [{_,_,Name}, [{_,_,Code}, Vid] | Avps]) ->
+ {Name, Code, opt(Vid), make_body(Avps)};
+
+mk(K, Body)
+ when K == enum;
+ K == define ->
+ lists:map(fun([{_,_,Name}, {_,_,Value}]) -> {Name, Value} end, Body);
+
+mk(K, Avps)
+ when K == avp_vendor_id;
+ K == custom_types;
+ K == inherits;
+ K == codecs ->
+ lists:map(fun({_,_,N}) -> N end, Avps).
+
+opt(false) ->
+ [];
+opt({_,_,X}) ->
+ [X].
+
+make_body(Avps) ->
+ lists:map(fun avp/1, Avps).
+
+avp([false, D, Avp]) ->
+ avp(D, Avp);
+avp([Q, D, Avp]) ->
+ {qual(Q), avp(D, Avp)}.
+
+avp(D, {'AVP', _}) ->
+ delim(D, "AVP");
+avp(D, {_, _, Name}) ->
+ delim(D, Name).
+
+delim($<, N) ->
+ {{N}};
+delim(${, N) ->
+ {N};
+delim($[, N) ->
+ [N].
+
+qual({true, {_,_,N}}) ->
+ {'*', N};
+qual({{_,_,N}, true}) ->
+ {N, '*'};
+qual({{_,_,N},{_,_,M}}) ->
+ {N, M};
+qual(true) ->
+ '*'.
+
+%% Optional reports when running verbosely.
+report(What, [F | A])
+ when is_function(F) ->
+ report(What, apply(F, A));
+report(What, Data) ->
+ report(get({?MODULE, verbose}), What, Data).
+
+report(true, Tag, Data) ->
+ io:format("##~n## ~p ~p~n", [Tag, Data]);
+report(false, _, _) ->
+ ok.
+
+%% ------------------------------------------------------------------------
+%% make_dict/1
+%%
+%% Turn a parsed dictionary into an dict.
+
+make_dict(Parse) ->
+ foldl(fun(T,A) ->
+ report(section, T),
+ section(T,A)
+ end,
+ dict:new(),
+ Parse).
+
+section([{T, L} | Rest], Dict)
+ when T == name;
+ T == prefix;
+ T == id;
+ T == vendor ->
+ case find(T, Dict) of
+ [] ->
+ dict:store(T, [[L | Rest]], Dict);
+ [[Line | _]] ->
+ ?RETURN(duplicate_section, [T, L, Line])
+ end;
+
+section([{T, L} | Rest], Dict)
+ when T == avp_types;
+ T == messages;
+ T == grouped;
+ T == inherits;
+ T == custom_types;
+ T == codecs;
+ T == avp_vendor_id;
+ T == enum;
+ T == define ->
+ dict:append(T, [L | Rest], Dict).
+
+%% ===========================================================================
+%% reset/2
+%%
+%% Reset sections from options.
+
+reset(Dict, Opts) ->
+ foldl([fun reset/3, Opts], Dict, [name, prefix, inherits]).
+
+reset(K, Dict, Opts) ->
+ foldl(fun opt/2, Dict, [T || {A,_} = T <- Opts, A == K]).
+
+opt({inherits = Key, "-"}, Dict) ->
+ dict:erase(Key, Dict);
+opt({inherits = Key, Mod}, Dict) ->
+ dict:append(Key, [0, {word, 0, Mod}], Dict);
+opt({Key, Val}, Dict) ->
+ dict:store(Key, [0, {word, 0, Val}], Dict);
+opt(_, Dict) ->
+ Dict.
+
+%% ===========================================================================
+%% pass1/1
+%%
+%% Explode sections into additional dictionary entries plus semantic
+%% checks.
+
+pass1(Dict) ->
+ true = no_messages_without_id(Dict),
+
+ foldl(fun(K,D) -> foldl([fun p1/3, K], D, find(K,D)) end,
+ Dict,
+ [avp_types, %% must precede inherits, grouped, enum
+ avp_vendor_id,
+ custom_types,
+ codecs,
+ inherits,
+ grouped,
+ messages,
+ enum,
+ define]).
+
+%% Multiple sections are allowed as long as their bodies don't
+%% overlap. (Except enum/define.)
+
+p1([_Line, X | Body], Dict, K)
+ when K == avp_vendor_id;
+ K == custom_types;
+ K == codecs;
+ K == inherits ->
+ foldl([fun explode/4, X, K], Dict, Body);
+
+p1([_Line, X | Body], Dict, K)
+ when K == define;
+ K == enum ->
+ {_, L, Name} = X,
+ foldl([fun explode2/4, X, K],
+ store_new({K, Name},
+ [L, Body],
+ Dict,
+ [K, Name, L],
+ already_declared),
+ Body);
+
+p1([_Line | Body], Dict, K)
+ when K == avp_types;
+ K == grouped;
+ K == messages ->
+ foldl([fun explode/3, K], Dict, Body).
+
+no_messages_without_id(Dict) ->
+ case find(messages, Dict) of
+ [] ->
+ true;
+ [[Line | _] | _] ->
+ [] /= find(id, Dict) orelse ?RETURN(messages_without_id, [Line])
+ end.
+
+%% Note that the AVP's in avp_vendor_id, custom_types, codecs and
+%% enum can all be inherited, as can the AVP content of messages and
+%% grouped AVP's. Check that the referenced AVP's exist after
+%% importing definitions.
+
+%% explode/4
+%%
+%% {avp_vendor_id, AvpName} -> [Lineno, Id::integer()]
+%% {custom_types|codecs|inherits, AvpName} -> [Lineno, Mod::string()]
+
+explode({_, Line, AvpName}, Dict, {_, _, X}, K) ->
+ true = K /= inherits orelse avp_not_local(AvpName, Line, Dict),
+
+ store_new({key(K), AvpName},
+ [Line, X],
+ Dict,
+ [AvpName, Line, K],
+ avp_already_defined).
+
+%% explode2/4
+
+%% {define, {Name, Key}} -> [Lineno, Value::integer(), enum|define]
+
+explode2([{_, Line, Key}, {_, _, Value}], Dict, {_, _, X}, K) ->
+ store_new({key(K), {X, Key}},
+ [Line, Value, K],
+ Dict,
+ [X, Key, K, Line],
+ key_already_defined).
+
+%% key/1
+%%
+%% Conflate keys that are equivalent as far as uniqueness of
+%% definition goes.
+
+key(K)
+ when K == enum;
+ K == define ->
+ define;
+key(K)
+ when K == custom_types;
+ K == codecs ->
+ custom;
+key(K) ->
+ K.
+
+%% explode/3
+
+%% {avp_types, AvpName} -> [Line | Toks]
+%% {avp_types, {Code, IsReq}} -> [Line, AvpName]
+%%
+%% where AvpName = string()
+%% Code = integer()
+%% IsReq = boolean()
+
+explode([{_, Line, Name} | Toks], Dict0, avp_types = K) ->
+ %% Each AVP can be defined only once.
+ Dict1 = store_new({K, Name},
+ [Line | Toks],
+ Dict0,
+ [Name, Line],
+ avp_name_already_defined),
+
+ [{number, _, _Code}, {word, _, Type}, {word, _, _Flags}] = Toks,
+
+ true = avp_type_known(Type, Name, Line),
+
+ Dict1;
+
+%% {grouped, Name} -> [Line, HeaderTok | AvpToks]
+%% {grouped, {Name, AvpName}} -> [Line, Qual, Delim]
+%%
+%% where Name = string()
+%% AvpName = string()
+%% Qual = {Q, Q} | boolean()
+%% Q = true | NumberTok
+%% Delim = $< | ${ | $[
+
+explode([{_, Line, Name}, Header | Avps], Dict0, grouped = K) ->
+ Dict = store_new({K, Name},
+ [Line, Header | Avps],
+ Dict0,
+ [Name, Line],
+ group_already_defined),
+
+ [{_,_, Code}, Vid] = Header,
+ {DefLine, {_, _, Flags}} = grouped_flags(Name, Code, Dict0, Line),
+ V = lists:member($V, Flags),
+
+ false = vendor_id_mismatch(Vid, V, Name, Dict0, Line, DefLine),
+
+ explode_avps(Avps, Dict, K, Name);
+
+%% {messages, Name} -> [Line, HeaderTok | AvpToks]
+%% {messages, {Code, IsReq}} -> [Line, NameTok]
+%% {messages, Code} -> [[Line, NameTok, IsReq]]
+%% {messages, {Name, Flag}} -> [Line]
+%% {messages, {Name, AvpName}} -> [Line, Qual, Delim]
+%%
+%% where Name = string()
+%% Code = integer()
+%% IsReq = boolean()
+%% Flag = 'REQ' | 'PXY'
+%% AvpName = string()
+%% Qual = true | {Q,Q}
+%% Q = true | NumberTok
+%% Delim = $< | ${ | ${
+
+explode([{'answer-message' = A, Line}, false = H | Avps],
+ Dict0,
+ messages = K) ->
+ Name = ?L(A),
+ Dict1 = store_new({K, Name},
+ [Line, H, Avps],
+ Dict0,
+ [Name, Line],
+ message_name_already_defined),
+
+ explode_avps(Avps, Dict1, K, Name);
+
+explode([{_, Line, MsgName} = M, Header | Avps],
+ Dict0,
+ messages = K) ->
+ %% There can be at most one message with a given name.
+ Dict1 = store_new({K, MsgName},
+ [Line, Header | Avps],
+ Dict0,
+ [MsgName, Line],
+ message_name_already_defined),
+
+ [{_, _, Code}, Bits, ApplId] = Header,
+
+ %% An application id specified as part of the message definition
+ %% has to agree with @id. The former is parsed just because RFC
+ %% 3588 specifies it.
+ false = application_id_mismatch(ApplId, Dict1, MsgName),
+
+ IsReq = lists:keymember('REQ', 1, Bits),
+
+ %% For each command code, there can be at most one request and
+ %% one answer.
+ Dict2 = store_new({K, {Code, IsReq}},
+ [Line, M],
+ Dict1,
+ [choose(IsReq, "Request", "Answer"), Code, Line],
+ message_code_already_defined),
+
+ %% For each message, each flag can occur at most once.
+ Dict3 = foldl(fun({F,L},D) ->
+ store_new({K, {MsgName, F}},
+ [L],
+ D,
+ [MsgName, ?L(F)],
+ message_has_duplicate_flag)
+ end,
+ Dict2,
+ Bits),
+
+ dict:append({K, Code},
+ [Line, M, IsReq],
+ explode_avps(Avps, Dict3, K, MsgName)).
+
+%% explode_avps/4
+%%
+%% Ensure required AVP order and sane qualifiers. Can't check for AVP
+%% names until after they've been imported.
+%%
+%% RFC 3588 allows a trailing fixed while 3588bis doesn't. Parse the
+%% former.
+
+explode_avps(Avps, Dict, Key, Name) ->
+ xa("<{[<", Avps, Dict, Key, Name).
+
+xa(_, [], Dict, _, _) ->
+ Dict;
+
+xa(Ds, [[Qual, D, {'AVP', Line}] | Avps], Dict, Key, Name) ->
+ xa(Ds, [[Qual, D, {word, Line, "AVP"}] | Avps], Dict, Key, Name);
+
+xa([], [[_Qual, D, {_, Line, Name}] | _], _, _, _) ->
+ ?RETURN(invalid_avp_order, [D, Name, close(D), Line]);
+
+xa([D|_], [[{{_, Line, Min}, {_, _, Max}}, D, _] | _], _, _, _)
+ when Min > Max ->
+ ?RETURN(invalid_qualifier, [Min, Max, Line]);
+
+xa([D|_] = Ds, [[Qual, D, {_, Line, AvpName}] | Avps], Dict, Key, Name) ->
+ xa(Ds,
+ Avps,
+ store_new({Key, {Name, AvpName}},
+ [Line, Qual, D],
+ Dict,
+ [Name, Line],
+ avp_already_referenced),
+ Key,
+ Name);
+
+xa([_|Ds], Avps, Dict, Key, Name) ->
+ xa(Ds, Avps, Dict, Key, Name).
+
+close($<) -> $>;
+close(${) -> $};
+close($[) -> $].
+
+%% application_id_mismatch/3
+
+application_id_mismatch({number, Line, Id}, Dict, MsgName) ->
+ [[_, {_, L, I}]] = dict:fetch(id, Dict),
+
+ I /= Id andalso ?RETURN(message_application_id_mismatch,
+ [MsgName, Id, Line, I, L]);
+
+application_id_mismatch(false = No, _, _) ->
+ No.
+
+%% avp_not_local/3
+
+avp_not_local(Name, Line, Dict) ->
+ A = find({avp_types, Name}, Dict),
+
+ [] == A orelse ?RETURN(inherited_avp_already_defined,
+ [Name, Line, hd(A)]).
+
+%% avp_type_known/3
+
+avp_type_known(Type, Name, Line) ->
+ false /= type(Type)
+ orelse ?RETURN(avp_has_unknown_type, [Name, Line, Type]).
+
+%% vendor_id_mismatch/6
+
+vendor_id_mismatch({_,_,_}, false, Name, _, Line, DefLine) ->
+ ?RETURN(grouped_vendor_id_without_flag, [Name, Line, DefLine]);
+
+vendor_id_mismatch({_, _, I}, true, Name, Dict, Line, _) ->
+ case vendor_id(Name, Dict) of
+ {avp_vendor_id, L, N} ->
+ I /= N andalso
+ ?RETURN(grouped_vendor_id_mismatch, [Name, Line, I, N, L]);
+ _ ->
+ false
+ end;
+
+vendor_id_mismatch(_, _, _, _, _, _) ->
+ false.
+
+%% grouped_flags/4
+
+grouped_flags(Name, Code, Dict, Line) ->
+ case find({avp_types, Name}, Dict) of
+ [L, {_, _, Code}, {_, _, "Grouped"}, Flags] ->
+ {L, Flags};
+ [_, {_, L, C}, {_, _, "Grouped"}, _Flags] ->
+ ?RETURN(grouped_avp_code_mismatch, [Name, Line, Code, C, L]);
+ [_, _Code, {_, L, T}, _] ->
+ ?RETURN(grouped_avp_has_wrong_type, [Name, Line, T, L]);
+ [] ->
+ ?RETURN(grouped_avp_not_defined, [Name, Line])
+ end.
+
+%% vendor_id/2
+
+%% Look for a vendor id in @avp_vendor_id, then @vendor.
+vendor_id(Name, Dict) ->
+ case find({avp_vendor_id, Name}, Dict) of
+ [Line, Id] when is_integer(Id) ->
+ {avp_vendor_id, Line, Id};
+ [] ->
+ vendor(Dict)
+ end.
+
+vendor(Dict) ->
+ case find(vendor, Dict) of
+ [[_Line, {_, _, Id}, {_, _, _}]] ->
+ {vendor, Id};
+ [] ->
+ false
+ end.
+
+%% find/2
+
+find(Key, Dict) ->
+ case dict:find(Key, Dict) of
+ {ok, L} when is_list(L) ->
+ L;
+ error ->
+ []
+ end.
+
+%% store_new/5
+
+store_new(Key, Value, Dict, Args, Err) ->
+ case dict:find(Key, Dict) of
+ {ok, [L | _]} ->
+ ?RETURN(Err, Args ++ [L]);
+ error ->
+ dict:store(Key, Value, Dict)
+ end.
+
+%% type/1
+
+type("DiamIdent") ->
+ "DiameterIdentity";
+type("DiamURI") ->
+ "DiameterURI";
+type(T)
+ when T == "OctetString";
+ T == "Integer32";
+ T == "Integer64";
+ T == "Unsigned32";
+ T == "Unsigned64";
+ T == "Float32";
+ T == "Float64";
+ T == "Grouped";
+ T == "Enumerated";
+ T == "Address";
+ T == "Time";
+ T == "UTF8String";
+ T == "DiameterIdentity";
+ T == "DiameterURI";
+ T == "IPFilterRule";
+ T == "QoSFilterRule" ->
+ T;
+type(_) ->
+ false.
+
+%% ===========================================================================
+%% pass2/1
+%%
+%% More explosion, but that requires the previous pass to write its
+%% entries.
+
+pass2(Dict) ->
+ foldl(fun(K,D) -> foldl([fun p2/3, K], D, find(K,D)) end,
+ Dict,
+ [avp_types]).
+
+p2([_Line | Body], Dict, avp_types) ->
+ foldl(fun explode_avps/2, Dict, Body);
+
+p2([], Dict, _) ->
+ Dict.
+
+explode_avps([{_, Line, Name} | Toks], Dict) ->
+ [{number, _, Code}, {word, _, _Type}, {word, _, Flags}] = Toks,
+
+ true = avp_flags_valid(Flags, Name, Line),
+
+ Vid = avp_vendor_id(Flags, Name, Line, Dict),
+
+ %% An AVP is uniquely defined by its AVP code and vendor id (if any).
+ %% Ensure there are no duplicate.
+ store_new({avp_types, {Code, Vid}},
+ [Line, Name],
+ Dict,
+ [Code, Vid, Name, Line],
+ avp_code_already_defined).
+
+%% avp_flags_valid/3
+
+avp_flags_valid(Flags, Name, Line) ->
+ Bad = lists:filter(fun(C) -> not lists:member(C, "MVP") end, Flags),
+ [] == Bad
+ orelse ?RETURN(avp_has_invalid_flag, [Name, Line, hd(Bad)]),
+
+ Dup = Flags -- "MVP",
+ [] == Dup
+ orelse ?RETURN(avp_has_duplicate_flag, [Name, Line, hd(Dup)]).
+
+%% avp_vendor_id/4
+
+avp_vendor_id(Flags, Name, Line, Dict) ->
+ V = lists:member($V, Flags),
+
+ case vendor_id(Name, Dict) of
+ {avp_vendor_id, _, I} when V ->
+ I;
+ {avp_vendor_id, L, I} ->
+ ?RETURN(avp_has_vendor_id, [Name, Line, I, L]);
+ {vendor, I} when V ->
+ I;
+ false when V ->
+ ?RETURN(avp_has_no_vendor, [Name, Line]);
+ _ ->
+ false
+ end.
+
+%% ===========================================================================
+%% pass3/2
+%%
+%% Import AVPs.
+
+pass3(Dict, Opts) ->
+ import_enums(import_groups(import_avps(insert_codes(Dict), Opts))).
+
+%% insert_codes/1
+%%
+%% command_codes -> [{Code, ReqNameTok, AnsNameTok}]
+
+insert_codes(Dict) ->
+ dict:store(command_codes,
+ dict:fold(fun make_code/3, [], Dict),
+ Dict).
+
+make_code({messages, Code}, Names, Acc)
+ when is_integer(Code) ->
+ [mk_code(Code, Names) | Acc];
+make_code(_, _, Acc) ->
+ Acc.
+
+mk_code(Code, [[_, _, false] = Ans, [_, _, true] = Req]) ->
+ mk_code(Code, [Req, Ans]);
+
+mk_code(Code, [[_, {_,_,Req}, true], [_, {_,_,Ans}, false]]) ->
+ {Code, Req, Ans};
+
+mk_code(_Code, [[Line, _Name, IsReq]]) ->
+ ?RETURN(message_missing, [choose(IsReq, "Request", "Answer"),
+ Line,
+ choose(IsReq, "answer", "request")]).
+
+%% import_avps/2
+
+import_avps(Dict, Opts) ->
+ Import = inherit(Dict, Opts),
+ report(imported, Import),
+
+ %% pass4/1 tests that all referenced AVP's are either defined
+ %% or imported.
+
+ dict:store(import_avps,
+ lists:map(fun({M, _, As}) -> {M, [A || {_,A} <- As]} end,
+ lists:reverse(Import)),
+ foldl(fun explode_imports/2, Dict, Import)).
+
+explode_imports({Mod, Line, Avps}, Dict) ->
+ foldl([fun xi/4, Mod, Line], Dict, Avps).
+
+xi({L, {Name, _Code, _Type, _Flags} = A}, Dict, Mod, Line) ->
+ store_new({avp_types, Name},
+ [0, Mod, Line, L, A],
+ store_new({import, Name},
+ [Line],
+ Dict,
+ [Name, Line],
+ duplicate_import),
+ [Name, Mod, Line],
+ imported_avp_already_defined).
+
+%% import_groups/1
+%% import_enums/1
+%%
+%% For each inherited module, store the content of imported AVP's of
+%% type grouped/enumerated in a new key.
+
+import_groups(Dict) ->
+ dict:store(import_groups, import(grouped, Dict), Dict).
+
+import_enums(Dict) ->
+ dict:store(import_enums, import(enum, Dict), Dict).
+
+import(Key, Dict) ->
+ flatmap([fun import_key/2, Key], dict:fetch(import_avps, Dict)).
+
+import_key({Mod, Avps}, Key) ->
+ As = lists:flatmap(fun(T) ->
+ N = element(1,T),
+ choose(lists:keymember(N, 1, Avps), [T], [])
+ end,
+ orddict:fetch(Key, dict(Mod))),
+ if As == [] ->
+ [];
+ true ->
+ [{Mod, As}]
+ end.
+
+%% ------------------------------------------------------------------------
+%% inherit/2
+%%
+%% Return a {Mod, Line, [{Lineno, Avp}]} list, where Mod is a module
+%% name, Line points to the corresponding @inherit and each Avp is
+%% from Mod:dict(). Lineno is 0 if the import is implicit.
+
+inherit(Dict, Options) ->
+ Path = [D || {include, D} <- Options]
+ ++ [".", code:lib_dir(diameter, ebin)],
+ foldl([fun find_avps/3, Path], [], find(inherits, Dict)).
+%% Note that the module order of the returned lists is reversed
+%% relative to @inherits.
+
+find_avps([Line, {_,_,M} | Names], Acc, Path) ->
+ Mod = ?A(M),
+ report(inherit_from, Mod),
+ Avps = avps_from_beam(find_beam(Mod, Path), Mod), %% could be empty
+ case find_avps(Names, Avps) of
+ {_, [{_, L, N} | _]} ->
+ ?RETURN(requested_avp_not_found, [Mod, Line, N, L]);
+ {Found, []} ->
+ [{Mod, Line, lists:sort(Found)} | Acc]
+ end.
+
+%% Import everything not defined locally ...
+find_avps([], Avps) ->
+ {[{0, A} || A <- Avps], []};
+
+%% ... or specified AVPs.
+find_avps(Names, Avps) ->
+ foldl(fun fa/2, {[], Names}, Avps).
+
+fa({Name, _Code, _Type, _Flags} = A, {Found, Not} = Acc) ->
+ case lists:keyfind(Name, 3, Not) of
+ {_, Line, Name} ->
+ {[{Line, A} | Found], lists:keydelete(Name, 3, Not)};
+ false ->
+ Acc
+ end.
+
+%% find_beam/2
+
+find_beam(Mod, Dirs)
+ when is_atom(Mod) ->
+ find_beam(atom_to_list(Mod), Dirs);
+find_beam(Mod, Dirs) ->
+ Beam = Mod ++ code:objfile_extension(),
+ case try_path(Dirs, Beam) of
+ {value, Path} ->
+ Path;
+ false ->
+ ?RETURN(beam_not_on_path, [Mod])
+ end.
+
+try_path([D|Ds], Fname) ->
+ Path = filename:join(D, Fname),
+ case file:read_file_info(Path) of
+ {ok, _} ->
+ {value, Path};
+ _ ->
+ try_path(Ds, Fname)
+ end;
+try_path([], _) ->
+ false.
+
+%% avps_from_beam/2
+
+avps_from_beam(Path, Mod) ->
+ report(beam, Path),
+ ok = load_module(code:is_loaded(Mod), Mod, Path),
+ orddict:fetch(avp_types, dict(Mod)).
+
+load_module(false, Mod, Path) ->
+ R = filename:rootname(Path, code:objfile_extension()),
+ {module, Mod} = code:load_abs(R),
+ ok;
+load_module({file, _}, _, _) ->
+ ok.
+
+dict(Mod) ->
+ try Mod:dict() of
+ [?VERSION | Dict] ->
+ Dict;
+ _ ->
+ ?RETURN(recompile, [Mod])
+ catch
+ error:_ ->
+ ?RETURN(no_dict, [Mod])
+ end.
+
+%% ===========================================================================
+%% pass4/1
+%%
+%% Sanity checks.
+
+pass4(Dict) ->
+ dict:fold(fun(K, V, _) -> p4(K, V, Dict) end, ok, Dict),
+ Dict.
+
+%% Ensure enum AVP's have type Enumerated.
+p4({enum, Name}, [Line | _], Dict)
+ when is_list(Name) ->
+ true = is_enumerated_avp(Name, Dict, Line);
+
+%% Ensure all referenced AVP's are either defined locally or imported.
+p4({K, {Name, AvpName}}, [Line | _], Dict)
+ when (K == grouped orelse K == messages),
+ is_list(Name),
+ is_list(AvpName),
+ AvpName /= "AVP" ->
+ true = avp_is_defined(AvpName, Dict, Line);
+
+%% Ditto.
+p4({K, AvpName}, [Line | _], Dict)
+ when K == avp_vendor_id;
+ K == custom_types;
+ K == codecs ->
+ true = avp_is_defined(AvpName, Dict, Line);
+
+p4(_, _, _) ->
+ ok.
+
+%% has_enumerated_type/3
+
+is_enumerated_avp(Name, Dict, Line) ->
+ case find({avp_types, Name}, Dict) of
+ [_Line, _Code, {_, _, "Enumerated"}, _Flags] -> %% local
+ true;
+ [_Line, _Code, {_, L, T}, _] ->
+ ?RETURN(enumerated_avp_has_wrong_local_type,
+ [Name, Line, T, L]);
+ [0, _, _, _, {_Name, _Code, "Enumerated", _Flags}] -> %% inherited
+ true;
+ [0, Mod, LM, LA, {_Name, _Code, Type, _Flags}] ->
+ ?RETURN(enumerated_avp_has_wrong_inherited_type,
+ [Name, Line, Type, Mod, choose(0 == LA, LM, LA)]);
+ [] ->
+ ?RETURN(enumerated_avp_not_defined, [Name, Line])
+ end.
+
+avp_is_defined(Name, Dict, Line) ->
+ case find({avp_types, Name}, Dict) of
+ [_Line, _Code, _Type, _Flags] -> %% local
+ true;
+ [0, _, _, _, {Name, _Code, _Type, _Flags}] -> %% inherited
+ true;
+ [] ->
+ ?RETURN(avp_not_defined, [Name, Line])
+ end.
+
+%% ===========================================================================
+
+choose(true, X, _) -> X;
+choose(false, _, X) -> X.
+
+foldl(F, Acc, List) ->
+ lists:foldl(fun(T,A) -> eval([F,T,A]) end, Acc, List).
+
+flatmap(F, List) ->
+ lists:flatmap(fun(T) -> eval([F,T]) end, List).
+
+eval([[F|X] | A]) ->
+ eval([F | A ++ X]);
+eval([F|A]) ->
+ apply(F,A).