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nklib_util.erl
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%% -------------------------------------------------------------------
%%
%% Copyright (c) 2019 Carlos Gonzalez Florido. All Rights Reserved.
%%
%% This file is provided to you 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.
%%
%% -------------------------------------------------------------------
%% @doc Common library utility functions
-module(nklib_util).
-author('Carlos Gonzalez <[email protected]>').
-export([ensure_all_started/2, call/2, call/3, call2/2, call2/3, apply/3, safe_call/3]).
-export([luid/0, lhash/1, uid/0, uuid_4122/0, hash/1, hash/3, hash36/1, sha/1]).
-export([get_hwaddr/0, timestamp/0, m_timestamp/0,
l_timestamp/0, l_timestamp_to_float/1]).
-export([timestamp_to_local/1, timestamp_to_gmt/1]).
-export([local_to_timestamp/1, gmt_to_timestamp/1]).
-export([get_value/2, get_value/3, get_binary/2, get_binary/3, get_list/2, get_list/3]).
-export([get_integer/2, get_integer/3, keys/1]).
-export([store_value/2, store_value/3, store_values/2, filter_values/2, remove_values/2]).
-export([filtermap/2]).
-export([to_binary/1, to_list/1, to_map/1, to_integer/1, to_boolean/1,
to_float/1]).
-export([to_atom/1, to_existing_atom/1, make_atom/2, to_ip/1, to_host/1, to_host/2]).
-export([to_lower/1, to_upper/1, to_capital/1, to_binlist/1, strip/1, unquote/1, is_string/1]).
-export([bjoin/1, bjoin/2, words/1, capitalize/1, append_max/3, randomize/1]).
-export([hex/1, extract/2, delete/2, defaults/2, bin_last/2, find_duplicated/1]).
-export([cancel_timer/1, reply/2, demonitor/1, msg/2]).
-export([add_id/2, add_id/3]).
-export([base64_decode/1, base64url_encode/1, base64url_encode_mime/1, base64url_decode/1]).
-export([map_merge/2, prefix/2, rand/2, consistent_reorder/2, floor/1, ceiling/1]).
-export([do_try/1, do_config_get/1, do_config_get/2, do_config_put/2, do_config_del/1]).
-export_type([optslist/0, timestamp/0, m_timestamp/0, l_timestamp/0]).
-include("nklib.hrl").
-compile({parse_transform, nklib_parse_trans_vsn}).
-compile(inline).
%% ===================================================================
%% Types
%% ===================================================================
%% Standard Proplist
-type optslist() :: [atom() | binary() | {atom()|binary(), term()}].
%% System timestamp
-type timestamp() :: non_neg_integer().
-type l_timestamp() :: non_neg_integer().
-type m_timestamp() :: non_neg_integer().
%% ===================================================================
%% Public
%% =================================================================
%% @doc Ensure that an application and all of its transitive
%% dependencies are started.
-spec ensure_all_started(atom(), permanent | transient | temporary) ->
{ok, [atom()]} | {error, term()}.
ensure_all_started(Application, Type) ->
case ensure_all_started(Application, Type, []) of
{ok, Started} ->
{ok, lists:reverse(Started)};
{error, Reason, Started} ->
[ application:stop(App) || App <- Started ],
{error, Reason}
end.
%% @private
ensure_all_started(Application, Type, Started) ->
case application:start(Application, Type) of
ok ->
{ok, [Application | Started]};
{error, {already_started, Application}} ->
{ok, Started};
{error, {not_started, Dependency}} ->
case ensure_all_started(Dependency, Type, Started) of
{ok, NewStarted} ->
ensure_all_started(Application, Type, NewStarted);
Error ->
Error
end;
{error, Reason} ->
{error, Reason, Started}
end.
%% @doc See call/3
-spec call(atom()|pid(), term()) ->
term() | {error, {exit|error|throw, {term(), list()}}}.
call(Dest, Msg) ->
call(Dest, Msg, 5000).
%% @doc Like gen_server:call/3 but traps exceptions
%% For timeouts: {error, {exit, {{timeout, _}, _}}}
-spec call(atom()|pid(), term(), timeout() | infinity) ->
term() | {error, {exit|error|throw, {term(), list()}}}.
call(Dest, Msg, Timeout) ->
Fun = fun() -> gen_server:call(Dest, Msg, Timeout) end,
case nklib_util:do_try(Fun) of
{exception, {Class, {Error, Trace}}} ->
{error, {Class, {Error, Trace}}};
Other ->
Other
end.
%% @doc Safe call (no exceptions)
call2(Dest, Msg) ->
call2(Dest, Msg, 5000).
%% @doc Safe call (no exceptions)
call2(Dest, Msg, Timeout) ->
case call(Dest, Msg, Timeout) of
{error, {exit, {{timeout, _Fun}, _Stack}}} ->
{error, timeout};
{error, {exit, {{noproc, _Fun}, _Stack}}} ->
{error, process_not_found};
{error, {exit, {{normal, _Fun}, _Stack}}} ->
{error, process_not_found};
Other ->
Other
end.
%% @private
-spec apply(atom(), atom(), list()) ->
term() | not_exported | {error, {exit|error|throw, {term(), list()}}}.
apply(Mod, Fun, Args) ->
TryFun = fun() ->
case erlang:function_exported(Mod, Fun, length(Args)) of
false ->
not_exported;
true ->
erlang:apply(Mod, Fun, Args)
end
end,
case nklib_util:do_try(TryFun) of
{exception, {Class, {Error, Trace}}} ->
{error, {Class, {Error, Trace}}};
Other ->
Other
end.
%% @doc Safe gen_server:call/3
%% It will spawn helper process in order to be sure no spurious message arrives
-spec safe_call(atom()|pid(), term(), pos_integer()|infinity) ->
term().
safe_call(Dest, Msg, Timeout) ->
Master = self(),
Slave = spawn(
fun() ->
Reply = try
{ok, gen_server:call(Dest, Msg, Timeout)}
catch
error:E -> {error, E};
exit:E -> {exit, E}
end,
Master ! {self(), Reply}
end
),
receive
{Slave, {ok, Msg}} -> Msg;
{Slave, {error, Error}} -> error(Error);
{Slave, {exit, Exit}} -> exit(Exit)
end.
%% @doc Generates a new printable random UUID.
-spec luid() ->
binary().
luid() ->
lhash({make_ref(), os:timestamp()}).
%% @doc Generates a RFC4122 compatible uuid
-spec uuid_4122() ->
binary().
uuid_4122() ->
Rand = hex(crypto:strong_rand_bytes(4)),
<<A:16/bitstring, B:16/bitstring, C:16/bitstring>> =
<<(nklib_util:l_timestamp()):48>>,
{ok, Hw} = application:get_env(nklib, hw_addr),
<<Rand/binary, $-, (hex(A))/binary, $-, (hex(B))/binary, $-,
(hex(C))/binary, $-, Hw/binary>>.
%% @doc Generates a new printable SHA hash binary over `Base' (using 160 bits, 27 chars).
-spec lhash(term()) ->
binary().
lhash(Base) ->
<<I:160/integer>> = sha(term_to_binary(Base)),
case encode_integer(I) of
Hash when byte_size(Hash) == 27 -> Hash;
Hash -> <<(binary:copy(<<"a">>, 27-byte_size(Hash)))/binary, Hash/binary>>
end.
%% @private
sha(Term) -> crypto:hash(sha, Term).
%% @doc Generates a new random tag of 6 chars
-spec uid() ->
binary().
uid() ->
hash({make_ref(), os:timestamp()}).
%% @doc Generates a new tag of 6 chars based on a value.
-spec hash(term()) ->
binary().
hash(Base) ->
case encode_integer(erlang:phash2([Base], 4294967296)) of
Hash when byte_size(Hash)==6 -> Hash;
Hash -> <<(binary:copy(<<"a">>, 6-byte_size(Hash)))/binary, Hash/binary>>
end.
%% @doc Generates an integer hash Start =< X <= Stop
-spec hash(term(), integer(), integer()) ->
integer().
hash(Base, Start, Stop) when Start >= 0, Stop > Start ->
Hash = erlang:phash2([Base]),
Hash rem (Stop - Start + 1) + Start.
%% @doc Generates a new tag based on a value (only numbers and uppercase) of 7 chars
-spec hash36(term()) ->
binary().
hash36(Base) ->
case encode_integer_36(erlang:phash2([Base], 4294967296)) of
Hash when byte_size(Hash)==7 -> Hash;
Hash -> <<(binary:copy(<<"A">>, 7-byte_size(Hash)))/binary, Hash/binary>>
end.
%% @private Finds the MAC addr for enX or ethX, or a random one if none is found
get_hwaddr() ->
{ok, Addrs1} = inet:getifaddrs(),
Addrs2 = lists:filter(
fun
({"en"++_, _}) -> true;
({"eth"++_, _}) -> true;
(_) -> false
end,
Addrs1),
case get_hwaddrs(Addrs2) of
{ok, Hex} ->
Hex;
false ->
case get_hwaddrs(Addrs1) of
{ok, Hex} -> Hex;
false -> hex(crypto:strong_rand_bytes(6))
end
end.
%% @private
get_hwaddrs([{_Name, Data}|Rest]) ->
case nklib_util:get_value(hwaddr, Data) of
Hw when is_list(Hw), length(Hw)==6 -> {ok, hex(Hw)};
_ -> get_hwaddrs(Rest)
end;
get_hwaddrs([]) ->
false.
% calendar:datetime_to_gregorian_seconds({{1970,1,1},{0,0,0}}).
-define(SECONDS_FROM_GREGORIAN_BASE_TO_EPOCH, (1970*365+478)*24*60*60).
%% @doc Gets an second-resolution timestamp
-spec timestamp() -> timestamp().
timestamp() ->
{MegaSeconds, Seconds, _} = os:timestamp(),
MegaSeconds*1000000 + Seconds.
%% @doc Gets an microsecond-resolution timestamp
-spec l_timestamp() -> l_timestamp().
l_timestamp() ->
{N1, N2, N3} = os:timestamp(),
(N1 * 1000000 + N2) * 1000000 + N3.
%% @doc Gets an milisecond-resolution timestamp
-spec m_timestamp() -> m_timestamp().
m_timestamp() ->
l_timestamp() div 1000.
%% @doc Converts a `timestamp()' to a local `datetime()'.
-spec timestamp_to_local(timestamp()) ->
calendar:datetime().
timestamp_to_local(Secs) ->
calendar:now_to_local_time({0, Secs, 0}).
%% @doc Converts a `timestamp()' to a gmt `datetime()'.
-spec timestamp_to_gmt(timestamp()) ->
calendar:datetime().
timestamp_to_gmt(Secs) ->
calendar:now_to_universal_time({0, Secs, 0}).
%% @doc Generates a float representing `HHMMSS.MicroSecs' for a high resolution timer.
-spec l_timestamp_to_float(l_timestamp()) ->
float().
l_timestamp_to_float(LStamp) ->
Timestamp = trunc(LStamp/1000000),
{_, {H,Mi,S}} = nklib_util:timestamp_to_local(Timestamp),
Micro = LStamp-Timestamp*1000000,
H*10000+Mi*100+S+(Micro/1000000).
%% @doc Converts a local `datetime()' to a `timestamp()',
-spec gmt_to_timestamp(calendar:datetime()) ->
timestamp().
gmt_to_timestamp(DateTime) ->
calendar:datetime_to_gregorian_seconds(DateTime) - 62167219200.
%% @doc Converts a gmt `datetime()' to a `timestamp()'.
-spec local_to_timestamp(calendar:datetime()) ->
timestamp().
local_to_timestamp(DateTime) ->
case calendar:local_time_to_universal_time_dst(DateTime) of
[First, _] -> gmt_to_timestamp(First);
[Time] -> gmt_to_timestamp(Time);
[] -> 0
end.
%% @doc Equivalent to `proplists:get_value/2' but faster.
-spec get_value(term(), list()) ->
term().
get_value(Key, List) ->
get_value(Key, List, undefined).
%% @doc Requivalent to `proplists:get_value/3' but faster.
-spec get_value(term(), list(), term()) ->
term().
get_value(Key, List, Default) ->
case lists:keyfind(Key, 1, List) of
{_, Value} -> Value;
_ -> Default
end.
%% @doc Similar to `get_value(Key, List, <<>>)' but converting the result into
%% a `binary()'.
-spec get_binary(term(), list()) ->
binary().
get_binary(Key, List) ->
to_binary(get_value(Key, List, <<>>)).
%% @doc Similar to `get_value(Key, List, Default)' but converting the result into
%% a `binary()'.
-spec get_binary(term(), list(), term()) ->
binary().
get_binary(Key, List, Default) ->
to_binary(get_value(Key, List, Default)).
%% @doc Similar to `get_value(Key, List, [])' but converting the result into a `list()'.
-spec get_list(term(), list()) ->
list().
get_list(Key, List) ->
to_list(get_value(Key, List, [])).
%% @doc Similar to `get_value(Key, List, Default)' but converting the result
%% into a `list()'.
-spec get_list(term(), list(), term()) ->
list().
get_list(Key, List, Default) ->
to_list(get_value(Key, List, Default)).
%% @doc Similar to `get_value(Key, List, 0)' but converting the result into
%% an `integer()' or `error'.
-spec get_integer(term(), list()) ->
integer() | error.
get_integer(Key, List) ->
to_integer(get_value(Key, List, 0)).
%% @doc Similar to `get_value(Key, List, Default)' but converting the result into
%% a `integer()' or `error'.
-spec get_integer(term(), list(), term()) ->
integer() | error.
get_integer(Key, List, Default) ->
to_integer(get_value(Key, List, Default)).
%% @doc Get the keys of a map or list (the first element of any tuple,
%% or the element itself)
-spec keys(map()|list()) ->
[term()].
keys(Map) when is_map(Map) ->
maps:keys(Map);
keys(List) when is_list(List) ->
lists:map(
fun(Term) ->
case is_tuple(Term) of
true -> element(1, Term);
false -> Term
end
end,
List).
%% @doc Stores a value in a list
-spec store_value(term(), list()) ->
list().
store_value(Term, List) ->
case lists:member(Term, List) of
true -> List;
false -> [Term|List]
end.
%% @doc Stores a value in a proplist
-spec store_value(term(), term(), nklib:optslist()) ->
nklib:optslist().
store_value(Key, Val, List) ->
lists:keystore(Key, 1, List, {Key, Val}).
%% @doc Stores a set of values in a proplist
-spec store_values(list(), nklib:optslist()) ->
nklib:optslist().
store_values([{Key, Val}|Rest], List) ->
store_values(Rest, store_value(Key, Val, List));
store_values([Val|Rest], List) ->
store_values(Rest, store_value(Val, List));
store_values([], List) ->
List.
%% @doc Removes values from a list
-spec filter_values(list(), nklib:optslist()) ->
nklib:optslist().
filter_values(Values, List) ->
lists:filter(
fun(Term) ->
case is_tuple(Term) of
true -> lists:member(element(1, Term), Values);
false -> lists:member(Term, Values)
end
end,
List).
%% @doc Removes values from a list
-spec remove_values(list(), nklib:optslist()) ->
nklib:optslist().
remove_values(Values, List) ->
lists:filter(
fun(Term) ->
not case is_tuple(Term) of
true -> lists:member(element(1, Term), Values);
false -> lists:member(Term, Values)
end
end,
List).
-spec filtermap(Fun, List1) -> List2 when
Fun :: fun((Elem) -> boolean() | {'true', Value}),
List1 :: [Elem],
List2 :: [Elem | Value],
Elem :: term(),
Value :: term().
filtermap(F, [Hd|Tail]) ->
case F(Hd) of
true ->
[Hd|filtermap(F, Tail)];
{true,Val} ->
[Val|filtermap(F, Tail)];
false ->
filtermap(F, Tail)
end;
filtermap(F, []) when is_function(F, 1) ->
[].
%% @doc Converts anything into a `binary()'. Can convert ip addresses also.
-spec to_binary(term()) ->
binary().
to_binary(B) when is_binary(B) -> B;
to_binary([]) -> <<>>;
to_binary([Int|_]=L) when is_integer(Int) ->
case catch list_to_binary(L) of
{'EXIT', _} -> msg("~p", [L]);
Bin -> Bin
end;
to_binary(undefined) -> <<>>;
to_binary(A) when is_atom(A) -> atom_to_binary(A, latin1);
to_binary(I) when is_integer(I) -> list_to_binary(erlang:integer_to_list(I));
to_binary(#uri{}=Uri) -> nklib_unparse:uri(Uri);
to_binary(P) when is_pid(P) -> to_binary(to_list(P));
to_binary(N) -> msg("~p", [N]).
%% @doc Converts anything into a `string()'.
-spec to_list(string()|binary()|atom()|integer()|pid()|list()|map()) ->
string().
to_list(L) when is_list(L) -> L;
to_list(B) when is_binary(B) -> binary_to_list(B);
to_list(A) when is_atom(A) -> atom_to_list(A);
to_list(I) when is_integer(I) -> erlang:integer_to_list(I);
to_list(M) when is_map(M) -> maps:to_list(M);
to_list(P) when is_pid(P) -> pid_to_list(P).
%% @doc Converts anything into a `atom()'.
%% WARNING: Can create new atoms
-spec to_atom(string()|binary()|atom()|integer()) ->
atom().
to_atom(A) when is_atom(A) -> A;
to_atom(B) when is_binary(B) -> binary_to_atom(B, utf8);
to_atom(L) when is_list(L) -> list_to_atom(L);
to_atom(I) when is_integer(I) -> list_to_atom(integer_to_list(I)).
%% @doc Converts anything into an existing atom or throws an error
-spec to_existing_atom(string()|binary()|atom()|integer()) ->
atom().
to_existing_atom(A) when is_atom(A) -> A;
to_existing_atom(B) when is_binary(B) -> binary_to_existing_atom(B, utf8);
to_existing_atom(L) when is_list(L) -> list_to_existing_atom(L);
to_existing_atom(I) when is_integer(I) -> to_existing_atom(integer_to_list(I)).
%% @doc Generates an atom with a warning if it is new
-spec make_atom(term(), term()) ->
atom().
make_atom(_Id, Atom) when is_atom(Atom) ->
Atom;
make_atom(Id, Term) ->
Term2 = to_binary(Term),
case catch binary_to_existing_atom(Term2, utf8) of
{'EXIT', _} ->
lager:warning("NkLIB id '~p' created atom '~s'", [Id, Term2]),
binary_to_atom(Term2, utf8);
Atom ->
Atom
end.
-spec to_map(list()|map()) ->
map().
to_map(M) when is_map(M) ->
M;
to_map(L) when is_list(L) ->
L1 = lists:map(
fun(T) ->
case T of
{K, V} -> {K, V};
K -> {K, true}
end
end,
L),
maps:from_list(L1).
%% @doc Converts anything into a `integer()' or `error'.
-spec to_integer(integer()|binary()|string()) ->
integer() | error.
to_integer(I) when is_integer(I) ->
I;
to_integer(F) when is_float(F) ->
round(F);
to_integer(B) when is_binary(B) ->
to_integer(binary_to_list(B));
to_integer(L) when is_list(L) ->
case catch list_to_integer(L) of
I when is_integer(I) -> I;
_ -> error
end;
to_integer(_) ->
error.
%% @doc Converts anything into a `integer()' or `error'.
-spec to_float(integer()|binary()|string()|float()) ->
integer() | error.
to_float(F) when is_float(F) ->
F;
to_float(I) when is_integer(I) ->
I * 1.0;
to_float(L) when is_list(L) ->
case catch list_to_float(L) of
F when is_float(F) ->
F;
_ ->
case to_integer(L) of
I when is_integer(I) -> I * 1.0;
error -> error
end
end;
to_float(B) when is_binary(B) ->
to_float(binary_to_list(B));
to_float(_) ->
error.
%% @doc Converts anything into a `integer()' or `error'.
-spec to_boolean(integer()|binary()|string()|atom()) ->
true | false | error.
to_boolean(true) ->
true;
to_boolean(false) ->
false;
to_boolean(Term) ->
case catch to_lower(Term) of
<<"true">> -> true;
<<"false">> -> false;
_ -> error
end.
%% @doc Converts a `list()' or `binary()' into a `inet:ip_address()' or `error'.
-spec to_ip(string() | binary() | inet:ip_address()) ->
{ok, inet:ip_address()} | error.
to_ip({A, B, C, D}) when is_integer(A), is_integer(B), is_integer(C), is_integer(D) ->
{ok, {A, B, C, D}};
to_ip({A, B, C, D, E, F, G, H}) when is_integer(A), is_integer(B), is_integer(C),
is_integer(D), is_integer(E), is_integer(F),
is_integer(G), is_integer(H) ->
{ok, {A, B, C, D, E, F, G, H}};
to_ip(Address) when is_binary(Address) ->
to_ip(binary_to_list(Address));
% For IPv6
to_ip([$[ | Address1]) ->
case lists:reverse(Address1) of
[$] | Address2] -> to_ip(lists:reverse(Address2));
_ -> error
end;
to_ip(Address) when is_list(Address) ->
case inet_parse:address(Address) of
{ok, Ip} -> {ok, Ip};
_ -> error
end;
to_ip(_) ->
error.
%% @doc Converts an IP or host to a binary host value
-spec to_host(inet:ip_address() | string() | binary()) ->
binary().
to_host(IpOrHost) ->
to_host(IpOrHost, false).
%% @doc Converts an IP or host to a binary host value.
% If `IsUri' and it is an IPv6 address, it will be enclosed in `[' and `]'
-spec to_host(inet:ip_address() | string() | binary(), boolean()) ->
binary().
to_host({A,B,C,D}=Address, _IsUri)
when is_integer(A), is_integer(B), is_integer(C), is_integer(D) ->
list_to_binary(inet_parse:ntoa(Address));
to_host({A,B,C,D,E,F,G,H}=Address, IsUri)
when is_integer(A), is_integer(B), is_integer(C), is_integer(D),
is_integer(E), is_integer(F), is_integer(G), is_integer(H) ->
case IsUri of
true -> list_to_binary([$[, inet_parse:ntoa(Address), $]]);
false -> list_to_binary(inet_parse:ntoa(Address))
end;
to_host(Host, _IsUri) ->
to_binary(Host).
%% @doc converts a `string()' or `binary()' to a lower `binary()'.
-spec to_lower(string()|binary()|atom()) ->
binary().
to_lower(List) when is_list(List) ->
list_to_binary(string:to_lower(List));
to_lower(Other) ->
to_lower(to_list(Other)).
%% @doc converts a `string()' or `binary()' to an upper `binary()'.
-spec to_upper(string()|binary()|atom()) ->
binary().
to_upper(List) when is_list(List) ->
list_to_binary(string:to_upper(List));
to_upper(Other) ->
to_upper(to_list(Other)).
%% @doc converts a `string()' or `binary()' to an upper `binary()'.
-spec to_capital(string()|binary()|atom()) ->
binary().
to_capital(Text) ->
case to_binary(Text) of
<<First, Rest/binary>> when First >= $a, First =< $z ->
<<(First-32), Rest/binary>>;
Bin ->
Bin
end.
%% @doc Converts a binary(), string() or list() to a list of binaries
-spec to_binlist(term()|[term()]) ->
[binary()].
to_binlist([I|_]=String) when is_integer(I) -> [list_to_binary(String)];
to_binlist(List) when is_list(List) -> [to_binary(T) || T <- List];
to_binlist(Bin) when is_binary(Bin) -> [Bin];
to_binlist(Term) -> [to_binary(Term)].
%% @doc URI Strips trailing white space
-spec strip(list()|binary()) ->
list().
strip(Bin) when is_binary(Bin) -> strip(binary_to_list(Bin));
strip([32|Rest]) -> strip(Rest);
strip([13|Rest]) -> strip(Rest);
strip([10|Rest]) -> strip(Rest);
strip([9|Rest]) -> strip(Rest);
strip(Rest) -> Rest.
%% @doc Removes doble quotes
-spec unquote(list()|binary()) ->
list().
unquote(Bin) when is_binary(Bin) ->
unquote(binary_to_list(Bin));
unquote(List) ->
case strip(List) of
[$"|Rest] ->
case strip(lists:reverse(Rest)) of
[$"|Rest1] -> strip(lists:reverse(Rest1));
_ -> []
end;
Other ->
Other
end.
%% @doc Generates a printable string from a big number using base 62.
-spec encode_integer(integer()) ->
binary().
encode_integer(Int) ->
list_to_binary(integer_to_list(Int, 62, [])).
%% @doc Generates a printable string from a big number using base 36
%% (only numbers and uppercase)
-spec encode_integer_36(integer()) ->
binary().
encode_integer_36(Int) ->
list_to_binary(integer_to_list(Int, 36, [])).
%% @private
-spec integer_to_list(integer(), integer(), string()) ->
string().
integer_to_list(I0, Base, R0) ->
D = I0 rem Base,
I1 = I0 div Base,
R1 = if
D >= 36 -> [D-36+$a|R0];
D >= 10 -> [D-10+$A|R0];
true -> [D+$0|R0]
end,
if
I1 == 0 -> R1;
true -> integer_to_list(I1, Base, R1)
end.
%% @doc Extracts all elements in `Proplist' having key `KeyOrKeys' or having key in
%% `KeyOrKeys' if `KeyOrKeys' is a list.
-spec extract([term()], term() | [term()]) ->
[term()].
extract(PropList, KeyOrKeys) ->
Fun = fun(Term) ->
if
is_tuple(Term), is_list(KeyOrKeys) ->
lists:member(element(1, Term), KeyOrKeys);
is_tuple(Term) ->
element(1, Term) == KeyOrKeys;
is_list(KeyOrKeys) ->
lists:member(Term, KeyOrKeys);
Term == KeyOrKeys ->
true;
true ->
false
end
end,
lists:filter(Fun, PropList).
%% @doc Deletes all elements in `Proplist' having key `KeyOrKeys' or having key in
%% `KeyOrKeys' if `KeyOrKeys' is a list.
-spec delete([term()], term() | [term()]) ->
[term()].
delete(PropList, KeyOrKeys) ->
Fun = fun(Term) ->
if
is_tuple(Term), is_list(KeyOrKeys) ->
not lists:member(element(1, Term), KeyOrKeys);
is_tuple(Term) ->
element(1, Term) /= KeyOrKeys;
is_list(KeyOrKeys) ->
not lists:member(Term, KeyOrKeys);
Term /= KeyOrKeys ->
true;
true ->
false
end
end,
lists:filter(Fun, PropList).
%% @doc Inserts defaults in a proplist
-spec defaults(List::[{term(), term()}], Defaults::[{term(), term()}]) ->
[{term(), term()}].
defaults(List, []) ->
List;
defaults(List, [{Key, Val}|Rest]) ->
case lists:keymember(Key, 1, List) of
true -> defaults(List, Rest);
false -> defaults([{Key, Val}|List], Rest)
end.
%% @doc Checks if `Term' is a `string()' or `[]'.
-spec is_string(Term::term()) ->
boolean().
is_string([]) -> true;
is_string([F|R]) when is_integer(F) -> is_string(R);
is_string(_) -> false.
%% @doc Joins each element in `List' into a `binary()' using `<<",">>' as separator.
-spec bjoin(List::[term()]) ->
binary().
bjoin(List) ->
bjoin(List, <<",">>).
%% @doc Join each element in `List' into a `binary()', using the indicated `Separator'.
-spec bjoin(List::[term()], Separator::binary()) ->
binary().
bjoin(List, Sep) when is_integer(Sep) ->
bjoin(List, <<Sep>>);
bjoin([], _J) ->
<<>>;
bjoin([Term], _J) ->
to_binary(Term);
bjoin([First|Rest], J) ->
bjoin2(Rest, to_binary(First), J).
bjoin2([[]|Rest], Acc, J) ->
bjoin2(Rest, Acc, J);
bjoin2([Next|Rest], Acc, J) ->
bjoin2(Rest, <<Acc/binary, J/binary, (to_binary(Next))/binary>>, J);
bjoin2([], Acc, _J) ->
Acc.
%% @doc Splits a `string()' or `binary()' into a list of words
-spec words(string() | binary()) ->
[string()] | error.
words(Bin) when is_binary(Bin) ->
words(binary_to_list(Bin));
words(List) when is_list(List) ->
words(List, [], []);
words(_) ->
error.
%% @private
words([], [], Tokens) ->
lists:reverse(Tokens);
words([], Chs, Tokens) ->
lists:reverse([lists:reverse(Chs)|Tokens]);
words([Ch|Rest], Chs, Tokens) when Ch==32; Ch==9; Ch==13; Ch==10 ->
case Chs of
[] -> words(Rest, [], Tokens);
_ -> words(Rest, [], [lists:reverse(Chs)|Tokens])
end;
words([Ch|Rest], Chs, Tokens) ->
words(Rest, [Ch|Chs], Tokens).
% @dod
capitalize(Name) ->
capitalize(to_binary(Name), true, <<>>).
% @private
capitalize(<<>>, _, Acc) ->
Acc;