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xmpp.chapril.org-ejabberd/src/str.erl
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2022-02-11 09:39:25 +01:00

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%%%----------------------------------------------------------------------
%%% File : str.erl
%%% Author : Evgeniy Khramtsov <ekhramtsov@process-one.net>
%%% Purpose : Provide binary string manipulations
%%% Created : 23 Feb 2012 by Evgeniy Khramtsov <ekhramtsov@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2022 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(str).
-author('ekhramtsov@process-one.net').
%% API
-export([equal/2,
concat/2,
rchr/2,
str/2,
rstr/2,
span/2,
cspan/2,
copies/2,
words/1,
words/2,
sub_word/2,
sub_word/3,
strip/1,
strip/2,
len/1,
tokens/2,
left/2,
left/3,
right/2,
right/3,
centre/2,
centre/3,
sub_string/2,
sub_string/3,
to_upper/1,
join/2,
substr/2,
chr/2,
chars/3,
chars/2,
substr/3,
strip/3,
to_lower/1,
to_float/1,
prefix/2,
suffix/2,
format/2,
to_integer/1,
sha/1,
to_hexlist/1,
translate_and_format/3]).
%%%===================================================================
%%% API
%%%===================================================================
-spec len(binary()) -> non_neg_integer().
len(B) ->
byte_size(B).
-spec equal(binary(), binary()) -> boolean().
equal(B1, B2) ->
B1 == B2.
-spec concat(binary(), binary()) -> binary().
concat(B1, B2) ->
<<B1/binary, B2/binary>>.
-spec rchr(binary(), char()) -> non_neg_integer().
rchr(B, C) ->
string:rchr(binary_to_list(B), C).
-spec str(binary(), binary()) -> non_neg_integer().
str(B1, B2) ->
case binary:match(B1, B2) of
{R, _Len} -> R+1;
_ -> 0
end.
-spec rstr(binary(), binary()) -> non_neg_integer().
rstr(B1, B2) ->
string:rstr(binary_to_list(B1), binary_to_list(B2)).
-spec span(binary(), binary()) -> non_neg_integer().
span(B1, B2) ->
string:span(binary_to_list(B1), binary_to_list(B2)).
-spec cspan(binary(), binary()) -> non_neg_integer().
cspan(B1, B2) ->
string:cspan(binary_to_list(B1), binary_to_list(B2)).
-spec copies(binary(), non_neg_integer()) -> binary().
copies(B, N) ->
binary:copy(B, N).
-spec words(binary()) -> pos_integer().
words(B) ->
string:words(binary_to_list(B)).
-spec words(binary(), char()) -> pos_integer().
words(B, C) ->
string:words(binary_to_list(B), C).
-spec sub_word(binary(), integer()) -> binary().
sub_word(B, N) ->
iolist_to_binary(string:sub_word(binary_to_list(B), N)).
-spec sub_word(binary(), integer(), char()) -> binary().
sub_word(B, N, C) ->
iolist_to_binary(string:sub_word(binary_to_list(B), N, C)).
-spec strip(binary()) -> binary().
strip(B) ->
iolist_to_binary(string:strip(binary_to_list(B))).
-spec strip(binary(), both | left | right) -> binary().
strip(B, D) ->
iolist_to_binary(string:strip(binary_to_list(B), D)).
-spec left(binary(), non_neg_integer()) -> binary().
left(B, N) ->
iolist_to_binary(string:left(binary_to_list(B), N)).
-spec left(binary(), non_neg_integer(), char()) -> binary().
left(B, N, C) ->
iolist_to_binary(string:left(binary_to_list(B), N, C)).
-spec right(binary(), non_neg_integer()) -> binary().
right(B, N) ->
iolist_to_binary(string:right(binary_to_list(B), N)).
-spec right(binary(), non_neg_integer(), char()) -> binary().
right(B, N, C) ->
iolist_to_binary(string:right(binary_to_list(B), N, C)).
-spec centre(binary(), non_neg_integer()) -> binary().
centre(B, N) ->
iolist_to_binary(string:centre(binary_to_list(B), N)).
-spec centre(binary(), non_neg_integer(), char()) -> binary().
centre(B, N, C) ->
iolist_to_binary(string:centre(binary_to_list(B), N, C)).
-spec sub_string(binary(), pos_integer()) -> binary().
sub_string(B, N) ->
iolist_to_binary(string:sub_string(binary_to_list(B), N)).
-spec sub_string(binary(), pos_integer(), pos_integer()) -> binary().
sub_string(B, S, E) ->
iolist_to_binary(string:sub_string(binary_to_list(B), S, E)).
-spec to_upper(binary()) -> binary();
(char()) -> char().
to_upper(B) when is_binary(B) ->
iolist_to_binary(string:to_upper(binary_to_list(B)));
to_upper(C) ->
string:to_upper(C).
-spec join([binary()], binary() | char()) -> binary().
join(L, Sep) ->
iolist_to_binary(join_s(L, Sep)).
-spec substr(binary(), pos_integer()) -> binary().
substr(B, N) ->
binary_part(B, N-1, byte_size(B)-N+1).
-spec chr(binary(), char()) -> non_neg_integer().
chr(B, C) ->
string:chr(binary_to_list(B), C).
-spec chars(char(), non_neg_integer(), binary()) -> binary().
chars(C, N, B) ->
iolist_to_binary(string:chars(C, N, binary_to_list(B))).
-spec chars(char(), non_neg_integer()) -> binary().
chars(C, N) ->
iolist_to_binary(string:chars(C, N)).
-spec substr(binary(), pos_integer(), non_neg_integer()) -> binary().
substr(B, S, E) ->
binary_part(B, S-1, E).
-spec strip(binary(), both | left | right, char()) -> binary().
strip(B, D, C) ->
iolist_to_binary(string:strip(binary_to_list(B), D, C)).
-spec to_lower(binary()) -> binary();
(char()) -> char().
to_lower(B) when is_binary(B) ->
iolist_to_binary(string:to_lower(binary_to_list(B)));
to_lower(C) ->
string:to_lower(C).
-spec tokens(binary(), binary()) -> [binary()].
tokens(B1, B2) ->
[iolist_to_binary(T) ||
T <- string:tokens(binary_to_list(B1), binary_to_list(B2))].
-spec to_float(binary()) -> {float(), binary()} | {error, no_float}.
to_float(B) ->
case string:to_float(binary_to_list(B)) of
{error, R} ->
{error, R};
{Float, Rest} ->
{Float, iolist_to_binary(Rest)}
end.
-spec to_integer(binary()) -> {integer(), binary()} | {error, no_integer}.
to_integer(B) ->
case string:to_integer(binary_to_list(B)) of
{error, R} ->
{error, R};
{Int, Rest} ->
{Int, iolist_to_binary(Rest)}
end.
-spec prefix(binary(), binary()) -> boolean().
prefix(Prefix, B) ->
Size = byte_size(Prefix),
case B of
<<Prefix:Size/binary, _/binary>> ->
true;
_ ->
false
end.
-spec suffix(binary(), binary()) -> boolean().
suffix(B1, B2) ->
lists:suffix(binary_to_list(B1), binary_to_list(B2)).
-spec format(io:format(), list()) -> binary().
format(Format, Args) ->
unicode:characters_to_binary(io_lib:format(Format, Args)).
-spec translate_and_format(binary(), binary(), list()) -> binary().
translate_and_format(Lang, Format, Args) ->
format(unicode:characters_to_list(translate:translate(Lang, Format)), Args).
-spec sha(iodata()) -> binary().
sha(Text) ->
Bin = crypto:hash(sha, Text),
to_hexlist(Bin).
-spec to_hexlist(binary()) -> binary().
to_hexlist(S) when is_list(S) ->
to_hexlist(iolist_to_binary(S));
to_hexlist(Bin) when is_binary(Bin) ->
<< <<(digit_to_xchar(N div 16)), (digit_to_xchar(N rem 16))>> || <<N>> <= Bin >>.
%%%===================================================================
%%% Internal functions
%%%===================================================================
join_s([], _Sep) ->
[];
join_s([H|T], Sep) ->
[H, [[Sep, X] || X <- T]].
digit_to_xchar(D) when (D >= 0) and (D < 10) -> D + $0;
digit_to_xchar(D) -> D + $a - 10.
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