%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2010-2017. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(diameter_codegen).
%%
%% This module generates erl/hrl files for encode/decode modules from
%% the orddict parsed from a dictionary file by diameter_dict_util.
%% The generated code is simple (one-liners), and is called from
%% diameter_gen. The orddict itself is returned by dict/0 in the
%% generated module and diameter_dict_util calls this function when
%% importing dictionaries as a consequence of @inherits sections. That
%% is, @inherits introduces a dependency on the beam file of another
%% dictionary.
%%
-export([from_dict/4,
is_printable_ascii/1]). %% used by ?TERM/1 in diameter_forms.hrl
-include("diameter_forms.hrl").
-include("diameter_vsn.hrl").
-define(S, atom_to_list).
-define(A, list_to_atom).
-define(Atom(T), ?ATOM(?A(T))).
%% ===========================================================================
-spec from_dict(File, ParseD, Opts, Mode)
-> ok
| term()
when File :: string(),
ParseD :: orddict:orddict(),
Opts :: list(),
Mode :: parse | forms | erl | hrl.
from_dict(File, ParseD, Opts, Mode) ->
Outdir = proplists:get_value(outdir, Opts, "."),
Return = proplists:get_value(return, Opts, false),
Mod = mod(File, orddict:find(name, ParseD)),
putr(verbose, lists:member(verbose, Opts)),
try
maybe_write(Return, Mode, Outdir, Mod, gen(Mode, ParseD, ?A(Mod)))
after
eraser(verbose)
end.
mod(File, error) ->
filename:rootname(filename:basename(File));
mod(_, {ok, Mod}) ->
Mod.
maybe_write(true, _, _, _, T) ->
T;
maybe_write(_, Mode, Outdir, Mod, T) ->
Path = filename:join(Outdir, Mod), %% minus extension
do_write(Mode, [Path, $., ext(Mode)], T).
ext(parse) ->
"D";
ext(forms) ->
"F";
ext(T) ->
?S(T).
do_write(M, Path, T)
when M == parse;
M == forms ->
write_term(Path, T);
do_write(_, Path, T) ->
write(Path, T).
write(Path, T) ->
write(Path, "~s", T).
write_term(Path, T) ->
write(Path, "~p.~n", T).
write(Path, Fmt, T) ->
{ok, Fd} = file:open(Path, [write]),
io:fwrite(Fd, Fmt, [T]),
ok = file:close(Fd).
%% Optional reports when running verbosely.
report(What, Data) ->
report(getr(verbose), What, Data),
Data.
report(true, Tag, Data) ->
io:format(">>~n>> ~p ~p~n", [Tag, Data]);
report(false, _, _) ->
ok.
putr(Key, Value) ->
put({?MODULE, Key}, Value).
getr(Key) ->
get({?MODULE, Key}).
eraser(Key) ->
erase({?MODULE, Key}).
%% ===========================================================================
%% ===========================================================================
is_printable_ascii(C) ->
16#20 =< C andalso C =< 16#7F.
get_value(Key, Plist) ->
proplists:get_value(Key, Plist, []).
gen(parse, ParseD, _Mod) ->
[?VERSION | ParseD];
gen(forms, ParseD, Mod) ->
preprocess(Mod, erl_forms(Mod, ParseD));
gen(hrl, ParseD, Mod) ->
gen_hrl(Mod, ParseD);
gen(erl, ParseD, Mod) ->
[header(), prettypr(erl_forms(Mod, ParseD)), $\n].
erl_forms(Mod, ParseD) ->
Forms = [[{?attribute, module, Mod},
{?attribute, compile, {parse_transform, diameter_exprecs}},
{?attribute, compile, nowarn_unused_function}],
make_hrl_forms(ParseD),
[{?attribute, export, [{name, 0},
{id, 0},
{vendor_id, 0},
{vendor_name, 0},
{decode_avps, 3}, %% in diameter_gen.hrl
{encode_avps, 3}, %%
{grouped_avp, 4}, %%
{msg_name, 2},
{msg_header, 1},
{rec2msg, 1},
{msg2rec, 1},
{name2rec, 1},
{avp_name, 2},
{avp_arity, 1},
{avp_arity, 2},
{avp_header, 1},
{avp, 4},
{enumerated_avp, 3},
{empty_value, 2},
{dict, 0}]},
%% diameter.hrl is included for #diameter_avp
{?attribute, include_lib, "diameter/include/diameter.hrl"},
{?attribute, include_lib, "diameter/include/diameter_gen.hrl"},
f_name(Mod),
f_id(ParseD),
f_vendor_id(ParseD),
f_vendor_name(ParseD),
f_msg_name(ParseD),
f_msg_header(ParseD),
f_rec2msg(ParseD),
f_msg2rec(ParseD),
f_name2rec(ParseD),
f_avp_name(ParseD),
f_avp_arity_1(ParseD),
f_avp_arity_2(ParseD),
f_avp_header(ParseD),
f_avp(ParseD),
f_enumerated_avp(ParseD),
f_empty_value(ParseD),
f_dict(ParseD),
{eof, ?LINE}]],
lists:append(Forms).
make_hrl_forms(ParseD) ->
{_Prefix, MsgRecs, GrpRecs, ImportedGrpRecs}
= make_record_forms(ParseD),
RecordForms = MsgRecs ++ GrpRecs ++ lists:flatmap(fun({_,Fs}) -> Fs end,
ImportedGrpRecs),
RecNames = lists:map(fun({attribute,_,record,{N,_}}) -> N end,
RecordForms),
%% export_records is used by the diameter_exprecs parse transform.
[{?attribute, export_records, RecNames} | RecordForms].
make_record_forms(ParseD) ->
Prefix = prefix(ParseD),
MsgRecs = a_record(Prefix, fun msg_proj/1, get_value(messages, ParseD)),
GrpRecs = a_record(Prefix, fun grp_proj/1, get_value(grouped, ParseD)),
ImportedGrpRecs = [{M, a_record(Prefix, fun grp_proj/1, Gs)}
|| {M,Gs} <- get_value(import_groups, ParseD)],
{to_upper(Prefix), MsgRecs, GrpRecs, ImportedGrpRecs}.
msg_proj({Name, _, _, _, Avps}) ->
{Name, Avps}.
grp_proj({Name, _, _, Avps}) ->
{Name, Avps}.
%% a_record/3
a_record(Prefix, ProjF, L) ->
lists:map(fun(T) -> a_record(ProjF(T), Prefix) end, L).
a_record({Nm, Avps}, Prefix) ->
Name = list_to_atom(Prefix ++ Nm),
Fields = lists:map(fun field/1, Avps),
{?attribute, record, {Name, Fields}}.
field(Avp) ->
{Name, Arity} = avp_info(Avp),
if 1 == Arity ->
{?record_field, ?Atom(Name)};
true ->
{?record_field, ?Atom(Name), ?NIL}
end.
%%% ------------------------------------------------------------------------
%%% # name/0
%%% ------------------------------------------------------------------------
f_name(Name) ->
{?function, name, 0,
[{?clause, [], [], [?ATOM(Name)]}]}.
%%% ------------------------------------------------------------------------
%%% # id/0
%%% ------------------------------------------------------------------------
f_id(ParseD) ->
{?function, id, 0,
[c_id(orddict:find(id, ParseD))]}.
c_id({ok, Id}) ->
{?clause, [], [], [?INTEGER(Id)]};
c_id(error) ->
?BADARG(0).
%%% ------------------------------------------------------------------------
%%% # vendor_id/0
%%% ------------------------------------------------------------------------
f_vendor_id(ParseD) ->
{?function, vendor_id, 0,
[{?clause, [], [], [b_vendor_id(orddict:find(vendor, ParseD))]}]}.
b_vendor_id({ok, {Id, _}}) ->
?INTEGER(Id);
b_vendor_id(error) ->
?APPLY(erlang, error, [?TERM(undefined)]).
%%% ------------------------------------------------------------------------
%%% # vendor_name/0
%%% ------------------------------------------------------------------------
f_vendor_name(ParseD) ->
{?function, vendor_name, 0,
[{?clause, [], [], [b_vendor_name(orddict:find(vendor, ParseD))]}]}.
b_vendor_name({ok, {_, Name}}) ->
?Atom(Name);
b_vendor_name(error) ->
?APPLY(erlang, error, [?TERM(undefined)]).
%%% ------------------------------------------------------------------------
%%% # msg_name/1
%%% ------------------------------------------------------------------------
f_msg_name(ParseD) ->
{?function, msg_name, 2, msg_name(ParseD)}.
%% Return the empty name for any unknown command to which
%% DIAMETER_COMMAND_UNSUPPORTED should be replied.
msg_name(ParseD) ->
lists:flatmap(fun c_msg_name/1, proplists:get_value(command_codes,
ParseD,
[]))
++ [{?clause, [?VAR('_'), ?VAR('_')], [], [?ATOM('')]}].
c_msg_name({Code, Req, Ans}) ->
[{?clause, [?INTEGER(Code), ?ATOM(true)],
[],
[?Atom(Req)]},
{?clause, [?INTEGER(Code), ?ATOM(false)],
[],
[?Atom(Ans)]}].
%%% ------------------------------------------------------------------------
%%% # msg2rec/1
%%% ------------------------------------------------------------------------
f_msg2rec(ParseD) ->
{?function, msg2rec, 1, msg2rec(ParseD)}.
msg2rec(ParseD) ->
Pre = prefix(ParseD),
lists:map(fun(T) -> c_msg2rec(T, Pre) end, get_value(messages, ParseD))
++ [?BADARG(1)].
c_msg2rec({N,_,_,_,_}, Pre) ->
c_name2rec(N, Pre).
%%% ------------------------------------------------------------------------
%%% # rec2msg/1
%%% ------------------------------------------------------------------------
f_rec2msg(ParseD) ->
{?function, rec2msg, 1, rec2msg(ParseD)}.
rec2msg(ParseD) ->
Pre = prefix(ParseD),
lists:map(fun(T) -> c_rec2msg(T, Pre) end, get_value(messages, ParseD))
++ [?BADARG(1)].
c_rec2msg({N,_,_,_,_}, Pre) ->
{?clause, [?Atom(rec_name(N, Pre))], [], [?Atom(N)]}.
%%% ------------------------------------------------------------------------
%%% # name2rec/1
%%% ------------------------------------------------------------------------
f_name2rec(ParseD) ->
{?function, name2rec, 1, name2rec(ParseD)}.
name2rec(ParseD) ->
Pre = prefix(ParseD),
Groups = get_value(grouped, ParseD)
++ lists:flatmap(fun avps/1, get_value(import_groups, ParseD)),
lists:map(fun({N,_,_,_}) -> c_name2rec(N, Pre) end, Groups)
++ [{?clause, [?VAR('T')], [], [?CALL(msg2rec, [?VAR('T')])]}].
c_name2rec(Name, Pre) ->
{?clause, [?Atom(Name)], [], [?Atom(rec_name(Name, Pre))]}.
avps({_Mod, Avps}) ->
Avps.
%%% ------------------------------------------------------------------------
%%% # avp_name/1
%%% ------------------------------------------------------------------------
f_avp_name(ParseD) ->
{?function, avp_name, 2, avp_name(ParseD)}.
%% 3588, 4.1:
%%
%% AVP Code
%% The AVP Code, combined with the Vendor-Id field, identifies the
%% attribute uniquely. AVP numbers 1 through 255 are reserved for
%% backward compatibility with RADIUS, without setting the Vendor-Id
%% field. AVP numbers 256 and above are used for Diameter, which are
%% allocated by IANA (see Section 11.1).
avp_name(ParseD) ->
Avps = get_value(avp_types, ParseD),
Imported = get_value(import_avps, ParseD),
Vid = orddict:find(vendor, ParseD),
Vs = vendor_id_map(ParseD),
lists:map(fun(T) -> c_avp_name(T, Vs, Vid) end, Avps)
++ lists:flatmap(fun(T) -> c_imported_avp_name(T, Vs) end, Imported)
++ [{?clause, [?VAR('_'), ?VAR('_')], [], [?ATOM('AVP')]}].
c_avp_name({Name, Code, Type, Flags}, Vs, Vid) ->
c_avp_name_(?TERM({?A(Name), ?A(Type)}),
?INTEGER(Code),
vid(Name, Flags, Vs, Vid)).
%% Note that an imported AVP's vendor id is determined by
%% avp_vendor_id in the inheriting module and vendor in the inherited
%% module. In particular, avp_vendor_id in the inherited module is
%% ignored so can't just call Mod:avp_header/1 to retrieve the vendor
%% id. A vendor id specified in @grouped is equivalent to one
%% specified as avp_vendor_id.
c_imported_avp_name({Mod, Avps}, Vs) ->
lists:map(fun(A) -> c_avp_name(A, Vs, {module, Mod}) end, Avps).
c_avp_name_(T, Code, undefined = U) ->
{?clause, [Code, ?ATOM(U)],
[],
[T]};
c_avp_name_(T, Code, Vid) ->
{?clause, [Code, ?INTEGER(Vid)],
[],
[T]}.
vendor_id_map(ParseD) ->
lists:flatmap(fun({V,Ns}) -> [{N,V} || N <- Ns] end,
get_value(avp_vendor_id, ParseD))
++ lists:flatmap(fun({_,_,[],_}) -> [];
({N,_,[V],_}) -> [{N,V}]
end,
get_value(grouped, ParseD)).
%%% ------------------------------------------------------------------------
%%% # avp_arity/1
%%% ------------------------------------------------------------------------
f_avp_arity_1(ParseD) ->
{?function, avp_arity, 1, avp_arities(ParseD) ++ [?BADARG(1)]}.
avp_arities(ParseD) ->
Msgs = get_value(messages, ParseD),
Groups = get_value(grouped, ParseD)
++ lists:flatmap(fun avps/1, get_value(import_groups, ParseD)),
lists:map(fun c_avp_arities/1, Msgs ++ Groups).
c_avp_arities({N,_,_,_,As}) ->
c_avp_arities(N,As);
c_avp_arities({N,_,_,As}) ->
c_avp_arities(N,As).
c_avp_arities(Name, Avps) ->
Arities = [{?A(N), A} || T <- Avps, {N,A} <- [avp_info(T)]],
{?clause, [?Atom(Name)], [], [?TERM(Arities)]}.
%%% ------------------------------------------------------------------------
%%% # avp_arity/2
%%% ------------------------------------------------------------------------
f_avp_arity_2(ParseD) ->
{?function, avp_arity, 2, avp_arity(ParseD)}.
avp_arity(ParseD) ->
Msgs = get_value(messages, ParseD),
Groups = get_value(grouped, ParseD)
++ lists:flatmap(fun avps/1, get_value(import_groups, ParseD)),
c_avp_arity(Msgs ++ Groups)
++ [{?clause, [?VAR('_'), ?VAR('_')], [], [?INTEGER(0)]}].
c_avp_arity(L)
when is_list(L) ->
lists:flatmap(fun c_avp_arity/1, L);
c_avp_arity({N,_,_,_,As}) ->
c_avp_arity(N,As);
c_avp_arity({N,_,_,As}) ->
c_avp_arity(N,As).
c_avp_arity(Name, Avps) ->
lists:map(fun(A) -> c_arity(Name, A) end, Avps).
c_arity(Name, Avp) ->
{AvpName, Arity} = avp_info(Avp),
{?clause, [?Atom(Name), ?Atom(AvpName)], [], [?TERM(Arity)]}.
%%% ------------------------------------------------------------------------
%%% # avp/3
%%% ------------------------------------------------------------------------
f_avp(ParseD) ->
{?function, avp, 4, avp(ParseD) ++ [?BADARG(4)]}.
avp(ParseD) ->
Native = get_value(avp_types, ParseD),
CustomMods = get_value(custom_types, ParseD),
TypeMods = get_value(codecs, ParseD),
Imported = get_value(import_avps, ParseD),
Enums = get_value(enum, ParseD),
Custom = lists:map(fun({M,As}) -> {M, custom_types, As} end,
CustomMods)
++ lists:map(fun({M,As}) -> {M, codecs, As} end,
TypeMods),
avp(types(Native), Imported, Custom, Enums).
types(Avps) ->
lists:map(fun({N,_,T,_}) -> {N,T} end, Avps).
avp(Native, Imported, Custom, Enums) ->
report(native, Native),
report(imported, Imported),
report(custom, Custom),
TypeDict = lists:foldl(fun({N,_,T,_}, D) -> orddict:store(N,T,D) end,
orddict:from_list(Native),
lists:flatmap(fun avps/1, Imported)),
CustomNames = lists:flatmap(fun({_,_,Ns}) -> Ns end, Custom),
lists:map(fun c_base_avp/1,
lists:filter(fun({N,_}) -> not_in(CustomNames, N) end,
Native))
++ lists:flatmap(fun(I) -> cs_imported_avp(I, Enums, CustomNames) end,
Imported)
++ lists:flatmap(fun(C) -> cs_custom_avp(C, TypeDict) end, Custom).
not_in(List, X) ->
not lists:member(X, List).
c_base_avp({AvpName, "Enumerated"}) ->
{?clause, [?VAR('T'), ?VAR('Data'), ?Atom(AvpName), ?VAR('_')],
[],
[?CALL(enumerated_avp, [?VAR('T'), ?Atom(AvpName), ?VAR('Data')])]};
c_base_avp({AvpName, "Grouped"}) ->
{?clause, [?VAR('T'), ?VAR('Data'), ?Atom(AvpName), ?VAR('Opts')],
[],
[?CALL(grouped_avp, [?VAR('T'),
?Atom(AvpName),
?VAR('Data'),
?VAR('Opts')])]};
c_base_avp({AvpName, Type}) ->
{?clause, [?VAR('T'), ?VAR('Data'), ?Atom(AvpName), ?VAR('Opts')],
[],
[?APPLY(diameter_types, ?A(Type), [?VAR('T'),
?VAR('Data'),
?VAR('Opts')])]}.
cs_imported_avp({Mod, Avps}, Enums, CustomNames) ->
lists:map(fun(A) -> imported_avp(Mod, A, Enums) end,
lists:filter(fun({N,_,_,_}) -> not_in(CustomNames, N) end,
Avps)).
imported_avp(_Mod, {AvpName, _, "Grouped" = T, _}, _) ->
c_base_avp({AvpName, T});
imported_avp(Mod, {AvpName, _, "Enumerated" = T, _}, Enums) ->
case lists:keymember(AvpName, 1, Enums) of
true ->
c_base_avp({AvpName, T});
false ->
c_imported_avp(Mod, AvpName)
end;
imported_avp(Mod, {AvpName, _, _, _}, _) ->
c_imported_avp(Mod, AvpName).
c_imported_avp(Mod, AvpName) ->
{?clause, [?VAR('T'), ?VAR('Data'), ?Atom(AvpName), ?VAR('Opts')],
[],
[?CALL(avp, [?VAR('T'),
?VAR('Data'),
?Atom(AvpName),
?VAR('Opts'),
?ATOM(Mod)])]}.
cs_custom_avp({Mod, Key, Avps}, Dict) ->
lists:map(fun(N) -> c_custom_avp(Mod, Key, N, orddict:fetch(N, Dict)) end,
Avps).
c_custom_avp(Mod, Key, AvpName, Type) ->
{F,A} = custom(Key, AvpName, Type),
{?clause, [?VAR('T'), ?VAR('Data'), ?Atom(AvpName), ?VAR('Opts')],
[],
[?APPLY(?A(Mod), ?A(F), [?VAR('T'),
?Atom(A),
?VAR('Data'),
?VAR('Opts')])]}.
custom(custom_types, AvpName, Type) ->
{AvpName, Type};
custom(codecs, AvpName, Type) ->
{Type, AvpName}.
%%% ------------------------------------------------------------------------
%%% # enumerated_avp/3
%%% ------------------------------------------------------------------------
f_enumerated_avp(ParseD) ->
{?function, enumerated_avp, 3, enumerated_avp(ParseD) ++ [?BADARG(3)]}.
enumerated_avp(ParseD) ->
Enums = get_value(enum, ParseD),
lists:flatmap(fun cs_enumerated_avp/1, Enums)
++ lists:flatmap(fun({M,Es}) -> enumerated_avp(M, Es, Enums) end,
get_value(import_enums, ParseD)).
enumerated_avp(Mod, Es, Enums) ->
lists:flatmap(fun({N,_}) ->
cs_enumerated_avp(lists:keymember(N, 1, Enums),
Mod,
N)
end,
Es).
cs_enumerated_avp(true, Mod, Name) ->
[{?clause, [?VAR('T'), ?Atom(Name), ?VAR('Data')],
[],
[?APPLY(Mod, enumerated_avp, [?VAR('T'),
?Atom(Name),
?VAR('Data')])]}];
cs_enumerated_avp(false, _, _) ->
[].
cs_enumerated_avp({AvpName, Values}) ->
lists:flatmap(fun(V) -> c_enumerated_avp(AvpName, V) end, Values).
c_enumerated_avp(AvpName, {_,I}) ->
[{?clause, [?ATOM(decode), ?Atom(AvpName), ?TERM(<<I:32>>)],
[],
[?TERM(I)]},
{?clause, [?ATOM(encode), ?Atom(AvpName), ?INTEGER(I)],
[],
[?TERM(<<I:32>>)]}].
%%% ------------------------------------------------------------------------
%%% msg_header/1
%%% ------------------------------------------------------------------------
f_msg_header(ParseD) ->
{?function, msg_header, 1, msg_header(ParseD) ++ [?BADARG(1)]}.
msg_header(ParseD) ->
msg_header(get_value(messages, ParseD), ParseD).
msg_header([], _) ->
[];
msg_header(Msgs, ParseD) ->
ApplId = orddict:fetch(id, ParseD),
lists:map(fun({M,C,F,_,_}) -> c_msg_header(M, C, F, ApplId) end, Msgs).
%% Note that any application id in the message header spec is ignored.
c_msg_header(Name, Code, Flags, ApplId) ->
{?clause, [?Atom(Name)],
[],
[?TERM({Code, encode_msg_flags(Flags), ApplId})]}.
encode_msg_flags(Flags) ->
lists:foldl(fun emf/2, 0, Flags).
emf('REQ', N) -> N bor 2#10000000;
emf('PXY', N) -> N bor 2#01000000;
emf('ERR', N) -> N bor 2#00100000.
%%% ------------------------------------------------------------------------
%%% # avp_header/1
%%% ------------------------------------------------------------------------
f_avp_header(ParseD) ->
{?function, avp_header, 1, avp_header(ParseD) ++ [?BADARG(1)]}.
avp_header(ParseD) ->
Native = get_value(avp_types, ParseD),
Imported = get_value(import_avps, ParseD),
Vid = orddict:find(vendor, ParseD),
Vs = vendor_id_map(ParseD),
lists:flatmap(fun(A) -> c_avp_header(A, Vs, Vid) end,
Native ++ Imported).
c_avp_header({Name, Code, _Type, Flags}, Vs, Vid) ->
[{?clause, [?Atom(Name)],
[],
[?TERM({Code, encode_avp_flags(Flags), vid(Name, Flags, Vs, Vid)})]}];
c_avp_header({Mod, Avps}, Vs, _Vid) ->
lists:map(fun(A) -> c_imported_avp_header(A, Mod, Vs) end, Avps).
%% Note that avp_vendor_id in the inherited dictionary is ignored. The
%% value must be changed in the inheriting dictionary. This is
%% consistent with the semantics of avp_name/2.
c_imported_avp_header({Name, _Code, _Type, _Flags}, Mod, Vs) ->
Apply = ?APPLY(Mod, avp_header, [?Atom(Name)]),
{?clause, [?Atom(Name)],
[],
[case proplists:get_value(Name, Vs) of
undefined ->
Apply;
Vid ->
?CALL(setelement, [?INTEGER(3), Apply, ?INTEGER(Vid)])
end]}.
encode_avp_flags(Fs) ->
lists:foldl(fun eaf/2, 0, Fs).
eaf($V, F) -> 2#10000000 bor F;
eaf($M, F) -> 2#01000000 bor F;
eaf($P, F) -> 2#00100000 bor F.
vid(Name, Flags, Vs, Vid) ->
v(lists:member($V, Flags), Name, Vs, Vid).
v(true = T, Name, Vs, {module, Mod}) ->
v(T, Name, Vs, {ok, {Mod:vendor_id(), Mod:vendor_name()}});
v(true, Name, Vs, Vid) ->
case proplists:get_value(Name, Vs) of
undefined ->
{ok, {Id, _}} = Vid,
Id;
Id ->
Id
end;
v(false, _, _, _) ->
undefined.
%%% ------------------------------------------------------------------------
%%% # empty_value/0
%%% ------------------------------------------------------------------------
f_empty_value(ParseD) ->
{?function, empty_value, 2, empty_value(ParseD)}.
empty_value(ParseD) ->
Imported = lists:flatmap(fun avps/1, get_value(import_enums, ParseD)),
Groups = get_value(grouped, ParseD)
++ lists:flatmap(fun avps/1, get_value(import_groups, ParseD)),
Enums = [T || {N,_} = T <- get_value(enum, ParseD),
not lists:keymember(N, 1, Imported)]
++ Imported,
lists:map(fun c_empty_value/1, Groups ++ Enums)
++ [{?clause, [?VAR('Name'), ?VAR('Opts')],
[],
[?CALL(empty, [?VAR('Name'), ?VAR('Opts')])]}].
c_empty_value({Name, _, _, _}) ->
{?clause, [?Atom(Name), ?VAR('Opts')],
[],
[?CALL(empty_group, [?Atom(Name), ?VAR('Opts')])]};
c_empty_value({Name, _}) ->
{?clause, [?Atom(Name), ?VAR('_')],
[],
[?TERM(<<0:32>>)]}.
%%% ------------------------------------------------------------------------
%%% # dict/0
%%% ------------------------------------------------------------------------
f_dict(ParseD) ->
{?function, dict, 0,
[{?clause, [], [], [?TERM([?VERSION | ParseD])]}]}.
%%% ------------------------------------------------------------------------
%%% # gen_hrl/2
%%% ------------------------------------------------------------------------
gen_hrl(Mod, ParseD) ->
{Prefix, MsgRecs, GrpRecs, ImportedGrpRecs}
= make_record_forms(ParseD),
[hrl_header(Mod),
forms("Message records", MsgRecs),
forms("Grouped AVP records", GrpRecs),
lists:map(fun({M,Fs}) ->
forms("Grouped AVP records from " ++ atom_to_list(M),
Fs)
end,
ImportedGrpRecs),
format("ENUM Macros", m_enums(Prefix, false, get_value(enum, ParseD))),
format("DEFINE Macros", m_enums(Prefix, false, get_value(define, ParseD))),
lists:map(fun({M,Es}) ->
format("ENUM Macros from " ++ atom_to_list(M),
m_enums(Prefix, true, Es))
end,
get_value(import_enums, ParseD))].
forms(_, [] = No) ->
No;
forms(Banner, Forms) ->
format(Banner, prettypr(Forms)).
format(_, [] = No) ->
No;
format(Banner, Str) ->
[banner(Banner), Str, $\n].
prettypr(Forms) ->
erl_prettypr:format(erl_syntax:form_list(Forms)).
banner(Heading) ->
["\n\n"
"%%% -------------------------------------------------------\n"
"%%% ", Heading, ":\n"
"%%% -------------------------------------------------------\n\n"].
z(S) ->
string:join(string:tokens(S, "\s\t"), "\s").
m_enums(Prefix, Wrap, Enums) ->
lists:map(fun(T) -> m_enum(Prefix, Wrap, T) end, Enums).
m_enum(Prefix, B, {Name, Values}) ->
P = Prefix ++ to_upper(Name) ++ "_",
lists:map(fun({A,I}) ->
N = ["'", P, to_upper(z(A)), "'"],
wrap(B,
N,
["-define(", N, ", ", integer_to_list(I), ").\n"])
end,
Values).
wrap(true, Name, Def) ->
["-ifndef(", Name, ").\n", Def, "-endif.\n"];
wrap(false, _, Def) ->
Def.
to_upper(A) when is_atom(A) ->
to_upper(atom_to_list(A));
to_upper(S) ->
lists:map(fun tu/1, S).
tu(C) when C >= $a, C =< $z ->
C + $A - $a;
tu(C) ->
C.
header() ->
("%% -------------------------------------------------------------------\n"
"%% This is a generated file.\n"
"%% -------------------------------------------------------------------\n"
"\n").
hrl_header(Name) ->
header() ++ "-hrl_name('" ++ ?S(Name) ++ ".hrl').\n".
%% avp_info/1
avp_info(Entry) -> %% {Name, Arity}
case Entry of
{{A}} -> {A, 1};
{A} -> {A, 1};
[A] -> {A, {0,1}};
{Q,T} ->
{A,_} = avp_info(T),
{A, arity(T,Q)}
end.
%% Normalize arity to 1 or {N,X} where N is an integer. A record field
%% for an AVP is list-valued iff the normalized arity is not 1.
arity({{_}}, '*' = Inf) -> {0, Inf};
arity([_], '*' = Inf) -> {0, Inf};
arity({_}, '*' = Inf) -> {1, Inf};
arity(_, {_,_} = Q) -> Q.
prefix(ParseD) ->
case orddict:find(prefix, ParseD) of
{ok, P} ->
P ++ "_";
error ->
""
end.
rec_name(Name, Prefix) ->
Prefix ++ Name.
%% ===========================================================================
%% preprocess/2
%%
%% Preprocess forms as generated by 'forms' option. In particular,
%% replace the include_lib attributes in generated forms by the
%% corresponding forms, extracting the latter from an existing
%% dictionary (diameter_gen_relay). The resulting forms can be
%% compiled to beam using compile:forms/2 (which does no preprocessing
%% of it's own; DiY currently appears to be the only way to preprocess
%% a forms list).
preprocess(Mod, Forms) ->
{_, Beam, _} = code:get_object_code(diameter_gen_relay),
pp(Forms, remod(Mod, abstract_code(Beam))).
pp(Forms, {ok, Code}) ->
Files = files(Code, []),
lists:flatmap(fun(T) -> include(T, Files) end, Forms);
pp(Forms, {error, Reason}) ->
erlang:error({forms, Reason, Forms}).
%% Replace literal diameter_gen_relay atoms in the extracted forms.
%% ?MODULE for example.
remod(Mod, L)
when is_list(L) ->
[remod(Mod, T) || T <- L];
remod(Mod, {atom, _, diameter_gen_relay} = T) ->
setelement(3, T, Mod);
remod(Mod, T)
when is_tuple(T) ->
list_to_tuple(remod(Mod, tuple_to_list(T)));
remod(_, T) ->
T.
%% Replace include_lib by the corresponding forms.
include({attribute, _, include_lib, Path}, Files) ->
Inc = filename:basename(Path),
[{Inc, Forms}] = [T || {F, _} = T <- Files, F == Inc], %% expect one
lists:flatmap(fun filter/1, Forms);
include(T, _) ->
[T].
%% Extract abstract code.
abstract_code(Beam) ->
case beam_lib:chunks(Beam, [abstract_code]) of
{ok, {_Mod, [{abstract_code, {_Vsn, Code}}]}} ->
{ok, Code};
{ok, {_Mod, [{abstract_code, no_abstract_code = No}]}} ->
{error, No};
{error = E, beam_lib, Reason} ->
{E, Reason}
end.
%% Extract filename/forms pairs for included forms.
files([{attribute, _, file, {Path, _}} | T], Acc) ->
{Body, Rest} = lists:splitwith(fun({attribute, _, file, _}) -> false;
(_) -> true
end,
T),
files(Rest, [{filename:basename(Path), Body} | Acc]);
files([], Acc) ->
Acc.
%% Only retain record diameter_avp and functions not generated by
%% diameter_exprecs.
filter({attribute, _, record, {diameter_avp, _}} = T) ->
[T];
filter({function, _, Name, _, _} = T) ->
case ?S(Name) of
[$#|_] -> %% generated by diameter_exprecs
[];
_ ->
[T]
end;
filter(_) ->
[].
