%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2011. 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%
%%
-module(otp_specs).
-export([module/2, package/2, overview/2, type/1]).
-include("xmerl.hrl").
-define(XML_EXPORT, xmerl_xml).
-define(DEFAULT_XML_EXPORT, ?XML_EXPORT).
-define(DEFAULT_PP, erl_pp).
-define(IND(N), #xmlText{value="\n" ++ lists:duplicate(N, $\s)}).
-define(NL, "\n").
module(Element, Options) ->
XML = layout_module(Element, init_opts(Options)),
Export = proplists:get_value(xml_export, Options,
?DEFAULT_XML_EXPORT),
xmerl:export_simple(XML, Export, [#xmlAttribute{name=prolog,
value=""}]).
-record(opts, {pretty_print, file_suffix}).
init_opts(Options) ->
#opts{pretty_print = proplists:get_value(pretty_print,
Options, ?DEFAULT_PP),
%% It *is* depending on edoc.hrl!
file_suffix = proplists:get_value(file_suffix, Options, ".html")}.
layout_module(#xmlElement{name = module, content = Es}=E, Opts) ->
Name = get_attrval(name, E),
Functions = [{function_name(Elem), Elem} ||
Elem <- get_content(functions, Es)],
Types = [{type_name(Elem), Elem} || Elem <- get_content(typedecls, Es)],
Body = [{module,
[{name,[Name]}],
([?NL] ++ types(lists:sort(Types), Opts)
++ functions(lists:sort(Functions), Opts)
++ timestamp())}],
Body.
timestamp() ->
[{timestamp, [io_lib:fwrite("Generated by EDoc, ~s, ~s.",
[edoc_lib:datestr(date()),
edoc_lib:timestr(time())])]},?NL].
functions(Fs, Opts) ->
lists:flatmap(fun ({Name, E}) -> function(Name, E, Opts) end, Fs).
function(Name, #xmlElement{content = Es}, Opts) ->
TS = get_content(typespec, Es),
Spec = typespec(TS, Opts),
[{spec,(Name
++ [?IND(2),{contract,Spec}]
++ typespec_annos(TS))},
?NL].
function_name(E) ->
[] = get_attrval(module, E),
[?IND(2),{name,[atom(get_attrval(name, E))]},
?IND(2),{arity,[get_attrval(arity, E)]}].
label_anchor(Content, E) ->
case get_attrval(label, E) of
"" -> Content;
Ref -> [{marker, [{id, Ref}], Content}]
end.
typespec([], _Opts) -> [];
typespec(Es, Opts) ->
{Head, LDefs} = collect_clause(Es, Opts),
clause(Head, LDefs) ++ [?IND(2)].
collect_clause(Es, Opts) ->
Name = t_name(get_elem(erlangName, Es)),
Defs = get_elem(localdef, Es),
[Type] = get_elem(type, Es),
{format_spec(Name, Type, Opts), collect_local_defs(Defs, Opts)}.
clause(Head, LDefs) ->
FC = [?IND(6),{head,Head}] ++ local_clause_defs(LDefs),
[?IND(4),{clause,FC}].
local_clause_defs([]) -> [];
local_clause_defs(LDefs) ->
LocalDefs = [{subtype,T} || T <- coalesce_local_defs(LDefs, [])],
[?IND(6),{guard,margin(8, LocalDefs)}].
types(Ts, Opts) ->
lists:flatmap(fun ({Name, E}) -> typedecl(Name, E, Opts) end, Ts).
typedecl(Name, E=#xmlElement{content = Es}, Opts) ->
TD = get_content(typedef, Es),
TypeDef = typedef(E, TD, Opts),
[{type,(Name
++ [?IND(2),{typedecl, TypeDef}]
++ typedef_annos(TD))},
?NL].
type_name(#xmlElement{content = Es}) ->
Typedef = get_content(typedef, Es),
[E] = get_elem(erlangName, Typedef),
Args = get_content(argtypes, Typedef),
[] = get_attrval(module, E),
[?IND(2),{name,[atom(get_attrval(name, E))]},
?IND(2),{n_vars,[integer_to_list(length(Args))]}].
typedef(E, Es, Opts) ->
Ns = get_elem(erlangName, Es),
Name =
([t_name(Ns), "("]
++ seq(fun t_utype_elem/1, get_content(argtypes, Es), [")"])),
LDefs = collect_local_defs(get_elem(localdef, Es), Opts),
TypeHead = case get_elem(type, Es) of
[] -> label_anchor(Name, E);
Type -> (label_anchor(Name, E)
++ format_type(Name, Type, Opts))
end,
([?IND(6),{typehead,TypeHead}]
++ local_type_defs(LDefs, [])).
local_type_defs([], _) -> [];
local_type_defs(LDefs, Last) ->
LocalDefs = [{local_def,T} || T <- coalesce_local_defs(LDefs, Last)],
[?IND(6),{local_defs,margin(8, LocalDefs)}].
collect_local_defs(Es, Opts) ->
[collect_localdef(E, Opts) || E <- Es].
collect_localdef(E = #xmlElement{content = Es}, Opts) ->
Name = case get_elem(typevar, Es) of
[] ->
label_anchor(N0 = t_abstype(get_content(abstype, Es)), E);
[V] ->
N0 = t_var(V)
end,
{Name,N0,format_type(N0, get_elem(type, Es), Opts)}.
%% "A = t(), B = t()" is coalesced into "A = B = t()".
%% Names as B above are kept, but the formated string is empty.
coalesce_local_defs([], _Last) ->
[];
coalesce_local_defs([{Name,N0,TypeS} | L], Last) when Name =:= N0 ->
cld(L, [{Name,N0}], TypeS, Last);
coalesce_local_defs([{Name,N0,TypeS} | L], Last) ->
[local_def(N0, Name, TypeS, Last, L) | coalesce_local_defs(L, Last)].
cld([{Name,N0,TypeS} | L], Names, TypeS, Last) when Name =:= N0 ->
cld(L, [{Name,N0} | Names], TypeS, Last);
cld(L, Names0, TypeS, Last) ->
Names = [{_,Name0} | Names1] = lists:reverse(Names0),
NS = join([N || {N,_} <- Names], [" = "]),
([local_def(Name0, NS, TypeS, Last, L) |
[local_def(N0, "", "", [], L) || {_,N0} <- Names1]]
++ coalesce_local_defs(L, Last)).
local_def(Name, NS, TypeS, Last, L) ->
[{typename,Name},{string,NS ++ TypeS ++ [Last || L =:= []]}].
%% join([], Sep) when is_list(Sep) ->
%% [];
join([H|T], Sep) ->
H ++ lists:append([Sep ++ X || X <- T]).
%% Use the default formatting of EDoc, which creates references, and
%% then insert newlines and indentation according to erl_pp (the
%% (fast) Erlang pretty printer).
format_spec(Name, Type, #opts{pretty_print = erl_pp}=Opts) ->
try
L = t_clause(Name, Type),
O = pp_clause(Name, Type),
{R, ".\n"} = diaf(L, O, Opts),
R
catch _:_ ->
%% Example: "@spec ... -> record(a)"
format_spec(Name, Type, Opts#opts{pretty_print=default})
end;
format_spec(Sep, Type, _Opts) ->
t_clause(Sep, Type).
t_clause(Name, Type) ->
#xmlElement{content = [#xmlElement{name = 'fun', content = C}]} = Type,
[Name] ++ t_fun(C).
pp_clause(Pre, Type) ->
Types = ot_utype([Type]),
Atom = lists:duplicate(iolist_size(Pre), $a),
L1 = erl_pp:attribute({attribute,0,spec,{{list_to_atom(Atom),0},[Types]}}),
"-spec " ++ L2 = lists:flatten(L1),
L3 = Pre ++ lists:nthtail(length(Atom), L2),
re:replace(L3, "\n ", "\n", [{return,list},global]).
format_type(Name, Type, #opts{pretty_print = erl_pp}=Opts) ->
try
L = t_utype(Type),
O = pp_type(Name, Type),
{R, ".\n"} = diaf(L, O, Opts),
[" = "] ++ R
catch _:_ ->
%% Example: "t() = record(a)."
format_type(Name, Type, Opts#opts{pretty_print=default})
end;
format_type(_Name, Type, _Opts) ->
[" = "] ++ t_utype(Type).
pp_type(Prefix, Type) ->
Atom = list_to_atom(lists:duplicate(iolist_size(Prefix), $a)),
L1 = erl_pp:attribute({attribute,0,type,{Atom,ot_utype(Type),[]}}),
{L2,N} = case lists:dropwhile(fun(C) -> C =/= $: end, lists:flatten(L1)) of
":: " ++ L3 -> {L3,9}; % compensation for extra "()" and ":"
"::\n" ++ L3 -> {"\n"++L3,6}
end,
Ss = lists:duplicate(N, $\s),
re:replace(L2, "\n"++Ss, "\n", [{return,list},global]).
diaf(L, O0, Opts) ->
{R0, O} = diaf(L, [], O0, [], Opts),
R1 = rewrite_some_predefs(lists:reverse(R0)),
R = indentation(lists:flatten(R1)),
{R, O}.
diaf([C | L], St, [C | O], R, Opts) ->
diaf(L, St, O, [[C] | R], Opts);
diaf(" "++L, St, O, R, Opts) ->
diaf(L, St, O, R, Opts);
diaf("", [Cs | St], O, R, Opts) ->
diaf(Cs, St, O, R, Opts);
diaf("", [], O, R, _Opts) ->
{R, O};
diaf(L, St, " "++O, R, Opts) ->
diaf(L, St, O, [" " | R], Opts);
diaf(L, St, "\n"++O, R, Opts) ->
Ss = lists:takewhile(fun(C) -> C =:= $\s end, O),
diaf(L, St, lists:nthtail(length(Ss), O), ["\n"++Ss | R], Opts);
diaf([{seealso, HRef0, S0} | L], St, O0, R, Opts) ->
{S, O} = diaf(S0, app_fix(O0), Opts),
HRef = fix_mod_ref(HRef0, Opts),
diaf(L, St, O, [{seealso, HRef, S} | R], Opts);
diaf("="++L, St, "::"++O, R, Opts) ->
%% EDoc uses "=" for record field types; Dialyzer uses "::". Maybe
%% there should be an option for this, possibly affecting other
%% similar discrepancies.
diaf(L, St, O, ["=" | R], Opts);
diaf([Cs | L], St, O, R, Opts) ->
diaf(Cs, [L | St], O, R, Opts).
rewrite_some_predefs(S) ->
xpredef(lists:flatten(S)).
xpredef([]) ->
[];
xpredef("neg_integer()"++L) ->
["integer() =< -1"] ++ xpredef(L);
xpredef("non_neg_integer()"++L) ->
["integer() >= 0"] ++ xpredef(L);
xpredef("pos_integer()"++L) ->
["integer() >= 1"] ++ xpredef(L);
xpredef([T | Es]) when is_tuple(T) ->
[T | xpredef(Es)];
xpredef([E | Es]) ->
[[E] | xpredef(Es)].
indentation([]) ->
[];
indentation([$\n|L]) ->
[{br,[]}|indent(L)];
indentation([T | Es]) when is_tuple(T) ->
[T | indentation(Es)];
indentation([E|L]) ->
[[E]|indentation(L)].
indent([$\s|L]) ->
[{nbsp,[]}|indent(L)];
indent(L) ->
indentation(L).
app_fix(L) ->
try
{"//" ++ R1,L2} = app_fix(L, 1),
[App, Mod] = string:tokens(R1, "/"),
"//" ++ atom(App) ++ "/" ++ atom(Mod) ++ L2
catch _:_ -> L
end.
app_fix(L, I) -> % a bit slow
{L1, L2} = lists:split(I, L),
case erl_scan:tokens([], L1 ++ ". ", 1) of
{done, {ok,[{atom,_,Atom}|_],_}, _} -> {atom_to_list(Atom), L2};
_ -> app_fix(L, I+1)
end.
%% Remove the file suffix from module references.
fix_mod_ref(HRef, #opts{file_suffix = ""}) ->
HRef;
fix_mod_ref([{marker, S}]=HRef0, #opts{file_suffix = FS}) ->
{A, B} = lists:splitwith(fun(C) -> C =/= $# end, S),
case lists:member($:, A) of
true ->
HRef0; % should "save" most application references "http:"
false ->
case {lists:suffix(FS, A), B} of
{true, "#"++_} ->
[{marker, lists:sublist(A, length(A)-length(FS)) ++ B}];
_ ->
HRef0
end
end.
see(E, Es) ->
case href(E) of
[] -> Es;
Ref ->
[{seealso, Ref, Es}]
end.
href(E) ->
case get_attrval(href, E) of
"" -> [];
URI ->
[{marker, URI}]
end.
atom(String) ->
io_lib:write_atom(list_to_atom(String)).
t_name([E]) ->
N = get_attrval(name, E),
case get_attrval(module, E) of
"" -> atom(N);
M ->
S = atom(M) ++ ":" ++ atom(N),
case get_attrval(app, E) of
"" -> S;
A -> "//" ++ atom(A) ++ "/" ++ S
end
end.
t_utype([E]) ->
t_utype_elem(E).
t_utype_elem(E=#xmlElement{content = Es}) ->
case get_attrval(name, E) of
"" -> t_type(Es);
Name ->
T = t_type(Es),
case T of
[Name] -> T; % avoid generating "Foo::Foo"
T -> [Name] ++ ["::"] ++ T
end
end.
t_type([E=#xmlElement{name = typevar}]) ->
t_var(E);
t_type([E=#xmlElement{name = atom}]) ->
t_atom(E);
t_type([E=#xmlElement{name = integer}]) ->
t_integer(E);
t_type([E=#xmlElement{name = range}]) ->
t_range(E);
t_type([E=#xmlElement{name = binary}]) ->
t_binary(E);
t_type([E=#xmlElement{name = float}]) ->
t_float(E);
t_type([#xmlElement{name = nil}]) ->
t_nil();
t_type([#xmlElement{name = paren, content = Es}]) ->
t_paren(Es);
t_type([#xmlElement{name = list, content = Es}]) ->
t_list(Es);
t_type([#xmlElement{name = nonempty_list, content = Es}]) ->
t_nonempty_list(Es);
t_type([#xmlElement{name = tuple, content = Es}]) ->
t_tuple(Es);
t_type([#xmlElement{name = 'fun', content = Es}]) ->
["fun("] ++ t_fun(Es) ++ [")"];
t_type([E = #xmlElement{name = record, content = Es}]) ->
t_record(E, Es);
t_type([E = #xmlElement{name = abstype, content = Es}]) ->
t_abstype(E, Es);
t_type([#xmlElement{name = union, content = Es}]) ->
t_union(Es).
t_var(E) ->
[get_attrval(name, E)].
t_atom(E) ->
[get_attrval(value, E)].
t_integer(E) ->
[get_attrval(value, E)].
t_range(E) ->
[get_attrval(value, E)].
t_binary(E) ->
[get_attrval(value, E)].
t_float(E) ->
[get_attrval(value, E)].
t_nil() ->
["[]"].
t_paren(Es) ->
["("] ++ t_utype(get_elem(type, Es)) ++ [")"].
t_list(Es) ->
["["] ++ t_utype(get_elem(type, Es)) ++ ["]"].
t_nonempty_list(Es) ->
["["] ++ t_utype(get_elem(type, Es)) ++ [", ...]"].
t_tuple(Es) ->
["{"] ++ seq(fun t_utype_elem/1, Es, ["}"]).
t_fun(Es) ->
["("] ++ seq(fun t_utype_elem/1, get_content(argtypes, Es),
[") -> "] ++ t_utype(get_elem(type, Es))).
t_record(E, Es) ->
Name = ["#"] ++ t_type(get_elem(atom, Es)),
case get_elem(field, Es) of
[] ->
see(E, [Name, "{}"]);
Fs ->
see(E, Name) ++ ["{"] ++ seq(fun t_field/1, Fs, ["}"])
end.
t_field(#xmlElement{content = Es}) ->
t_type(get_elem(atom, Es)) ++ [" = "] ++ t_utype(get_elem(type, Es)).
t_abstype(E, Es) ->
Name = t_name(get_elem(erlangName, Es)),
case get_elem(type, Es) of
[] ->
see(E, [Name, "()"]);
Ts ->
see(E, [Name]) ++ ["("] ++ seq(fun t_utype_elem/1, Ts, [")"])
end.
t_abstype(Es) ->
([t_name(get_elem(erlangName, Es)), "("]
++ seq(fun t_utype_elem/1, get_elem(type, Es), [")"])).
t_union(Es) ->
seq(fun t_utype_elem/1, Es, " | ", []).
seq(F, Es, Tail) ->
seq(F, Es, ", ", Tail).
seq(F, [E], _Sep, Tail) ->
F(E) ++ Tail;
seq(F, [E | Es], Sep, Tail) ->
F(E) ++ [Sep] ++ seq(F, Es, Sep, Tail);
seq(_F, [], _Sep, Tail) ->
Tail.
get_elem(Name, [#xmlElement{name = Name} = E | Es]) ->
[E | get_elem(Name, Es)];
get_elem(Name, [_ | Es]) ->
get_elem(Name, Es);
get_elem(_, []) ->
[].
get_attr(Name, [#xmlAttribute{name = Name} = A | As]) ->
[A | get_attr(Name, As)];
get_attr(Name, [_ | As]) ->
get_attr(Name, As);
get_attr(_, []) ->
[].
get_attrval(Name, #xmlElement{attributes = As}) ->
case get_attr(Name, As) of
[#xmlAttribute{value = V}] ->
V;
[] -> ""
end.
get_content(Name, Es) ->
case get_elem(Name, Es) of
[#xmlElement{content = Es1}] ->
Es1;
[] -> []
end.
overview(_, _Options) -> [].
package(_, _Options) -> [].
type(_) -> [].
%% ---------------------------------------------------------------------
ot_utype([E]) ->
ot_utype_elem(E).
ot_utype_elem(E=#xmlElement{content = Es}) ->
case get_attrval(name, E) of
"" -> ot_type(Es);
N ->
Name = {var,0,list_to_atom(N)},
T = ot_type(Es),
case T of
Name -> T;
T -> {ann_type,0,[Name, T]}
end
end.
ot_type([E=#xmlElement{name = typevar}]) ->
ot_var(E);
ot_type([E=#xmlElement{name = atom}]) ->
ot_atom(E);
ot_type([E=#xmlElement{name = integer}]) ->
ot_integer(E);
ot_type([E=#xmlElement{name = range}]) ->
ot_range(E);
ot_type([E=#xmlElement{name = binary}]) ->
ot_binary(E);
ot_type([E=#xmlElement{name = float}]) ->
ot_float(E);
ot_type([#xmlElement{name = nil}]) ->
ot_nil();
ot_type([#xmlElement{name = paren, content = Es}]) ->
ot_paren(Es);
ot_type([#xmlElement{name = list, content = Es}]) ->
ot_list(Es);
ot_type([#xmlElement{name = nonempty_list, content = Es}]) ->
ot_nonempty_list(Es);
ot_type([#xmlElement{name = tuple, content = Es}]) ->
ot_tuple(Es);
ot_type([#xmlElement{name = 'fun', content = Es}]) ->
ot_fun(Es);
ot_type([#xmlElement{name = record, content = Es}]) ->
ot_record(Es);
ot_type([#xmlElement{name = abstype, content = Es}]) ->
ot_abstype(Es);
ot_type([#xmlElement{name = union, content = Es}]) ->
ot_union(Es).
ot_var(E) ->
{var,0,list_to_atom(get_attrval(name, E))}.
ot_atom(E) ->
{ok, [Atom], _} = erl_scan:string(get_attrval(value, E), 0),
Atom.
ot_integer(E) ->
{integer,0,list_to_integer(get_attrval(value, E))}.
ot_range(E) ->
[I1, I2] = string:tokens(get_attrval(value, E), "."),
{type,0,range,[{integer,0,list_to_integer(I1)},
{integer,0,list_to_integer(I2)}]}.
ot_binary(E) ->
{Base, Unit} =
case string:tokens(get_attrval(value, E), ",:*><") of
[] ->
{0, 0};
["_",B] ->
{list_to_integer(B), 0};
["_","_",U] ->
{0, list_to_integer(U)};
["_",B,_,"_",U] ->
{list_to_integer(B), list_to_integer(U)}
end,
{type,0,binary,[{integer,0,Base},{integer,0,Unit}]}.
ot_float(E) ->
{float,0,list_to_float(get_attrval(value, E))}.
ot_nil() ->
{nil,0}.
ot_paren(Es) ->
{paren_type,0,[ot_utype(get_elem(type, Es))]}.
ot_list(Es) ->
{type,0,list,[ot_utype(get_elem(type, Es))]}.
ot_nonempty_list(Es) ->
{type,0,nonempty_list,[ot_utype(get_elem(type, Es))]}.
ot_tuple(Es) ->
{type,0,tuple,[ot_utype_elem(E) || E <- Es]}.
ot_fun(Es) ->
Range = ot_utype(get_elem(type, Es)),
Args = [ot_utype_elem(A) || A <- get_content(argtypes, Es)],
{type,0,'fun',[{type,0,product,Args},Range]}.
ot_record(Es) ->
{type,0,record,[ot_type(get_elem(atom, Es)) |
[ot_field(F) || F <- get_elem(field, Es)]]}.
ot_field(#xmlElement{content = Es}) ->
{type,0,field_type,
[ot_type(get_elem(atom, Es)), ot_utype(get_elem(type, Es))]}.
ot_abstype(Es) ->
ot_name(get_elem(erlangName, Es),
[ot_utype_elem(Elem) || Elem <- get_elem(type, Es)]).
ot_union(Es) ->
{type,0,union,[ot_utype_elem(E) || E <- Es]}.
ot_name(Es, T) ->
case ot_name(Es) of
[Mod, ":", Atom] ->
{remote_type,0,[{atom,0,list_to_atom(Mod)},
{atom,0,list_to_atom(Atom)},T]};
"tuple" when T =:= [] ->
{type,0,tuple,any};
Atom ->
{type,0,list_to_atom(Atom),T}
end.
ot_name([E]) ->
Atom = get_attrval(name, E),
case get_attrval(module, E) of
"" -> Atom;
M ->
case get_attrval(app, E) of
"" ->
[M, ":", Atom];
A ->
["//"++A++"/" ++ M, ":", Atom] % EDoc only!
end
end.
%% Returns exactly those annotations that can be referred to. Note
%% that a Dialyzer type/spec (currently) can have more annotations
%% than can be represented by EDoc types. Note also that edoc_dia
%% has annotated all type variables with themselves.
typespec_annos([]) -> [?NL];
typespec_annos([_|Es]) ->
annotations(clause_annos(Es)).
clause_annos(Es) ->
[annos(get_elem(type, Es)), local_defs_annos(get_elem(localdef, Es))].
typedef_annos(Es) ->
annotations([(case get_elem(type, Es) of
[] -> [];
T -> annos(T)
end
++ lists:flatmap(fun annos_elem/1,
get_content(argtypes, Es))),
local_defs_annos(get_elem(localdef, Es))]).
local_defs_annos(Es) ->
lists:flatmap(fun localdef_annos/1, Es).
localdef_annos(#xmlElement{content = Es}) ->
annos(get_elem(type, Es)).
annotations(AnnoL) ->
Annos = lists:usort(lists:flatten(AnnoL)),
margin(2, Annos).
margin(N, L) ->
lists:append([[?IND(N),E] || E <- L]) ++ [?IND(N-2)].
annos([E]) ->
annos_elem(E).
annos_elem(E=#xmlElement{content = Es}) ->
case get_attrval(name, E) of
"" -> annos_type(Es);
"..." -> annos_type(Es); % compensate for a kludge in edoc_dia.erl
N ->
[{anno,[N]} | annos_type(Es)]
end.
annos_type([#xmlElement{name = list, content = Es}]) ->
annos(get_elem(type, Es));
annos_type([#xmlElement{name = nonempty_list, content = Es}]) ->
annos(get_elem(type, Es));
annos_type([#xmlElement{name = tuple, content = Es}]) ->
lists:flatmap(fun annos_elem/1, Es);
annos_type([#xmlElement{name = 'fun', content = Es}]) ->
(annos(get_elem(type, Es))
++ lists:flatmap(fun annos_elem/1, get_content(argtypes, Es)));
annos_type([#xmlElement{name = record, content = Es}]) ->
lists:append([annos(get_elem(type, Es1)) ||
#xmlElement{content = Es1} <- get_elem(field, Es)]);
annos_type([#xmlElement{name = abstype, content = Es}]) ->
lists:flatmap(fun annos_elem/1, get_elem(type, Es));
annos_type([#xmlElement{name = union, content = Es}]) ->
lists:flatmap(fun annos_elem/1, Es);
annos_type([E=#xmlElement{name = typevar}]) ->
annos_elem(E);
annos_type([#xmlElement{name = paren, content = Es}]) ->
annos(get_elem(type, Es));
annos_type(_) ->
[].
