mirror of
https://github.com/processone/ejabberd.git
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315 lines
7.8 KiB
Erlang
315 lines
7.8 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : str.erl
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%%% Author : Evgeniy Khramtsov <ekhramtsov@process-one.net>
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%%% Purpose : Provide binary string manipulations
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%%% Created : 23 Feb 2012 by Evgeniy Khramtsov <ekhramtsov@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2019 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(str).
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-author('ekhramtsov@process-one.net').
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%% API
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-export([equal/2,
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concat/2,
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rchr/2,
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str/2,
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rstr/2,
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span/2,
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cspan/2,
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copies/2,
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words/1,
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words/2,
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sub_word/2,
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sub_word/3,
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strip/1,
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strip/2,
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len/1,
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tokens/2,
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left/2,
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left/3,
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right/2,
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right/3,
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centre/2,
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centre/3,
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sub_string/2,
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sub_string/3,
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to_upper/1,
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join/2,
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substr/2,
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chr/2,
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chars/3,
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chars/2,
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substr/3,
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strip/3,
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to_lower/1,
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to_float/1,
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prefix/2,
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suffix/2,
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format/2,
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to_integer/1,
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sha/1,
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to_hexlist/1]).
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%%%===================================================================
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%%% API
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%%%===================================================================
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-spec len(binary()) -> non_neg_integer().
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len(B) ->
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byte_size(B).
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-spec equal(binary(), binary()) -> boolean().
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equal(B1, B2) ->
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B1 == B2.
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-spec concat(binary(), binary()) -> binary().
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concat(B1, B2) ->
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<<B1/binary, B2/binary>>.
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-spec rchr(binary(), char()) -> non_neg_integer().
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rchr(B, C) ->
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string:rchr(binary_to_list(B), C).
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-spec str(binary(), binary()) -> non_neg_integer().
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str(B1, B2) ->
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case binary:match(B1, B2) of
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{R, _Len} -> R+1;
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_ -> 0
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end.
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-spec rstr(binary(), binary()) -> non_neg_integer().
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rstr(B1, B2) ->
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string:rstr(binary_to_list(B1), binary_to_list(B2)).
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-spec span(binary(), binary()) -> non_neg_integer().
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span(B1, B2) ->
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string:span(binary_to_list(B1), binary_to_list(B2)).
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-spec cspan(binary(), binary()) -> non_neg_integer().
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cspan(B1, B2) ->
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string:cspan(binary_to_list(B1), binary_to_list(B2)).
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-spec copies(binary(), non_neg_integer()) -> binary().
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copies(B, N) ->
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binary:copy(B, N).
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-spec words(binary()) -> pos_integer().
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words(B) ->
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string:words(binary_to_list(B)).
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-spec words(binary(), char()) -> pos_integer().
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words(B, C) ->
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string:words(binary_to_list(B), C).
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-spec sub_word(binary(), integer()) -> binary().
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sub_word(B, N) ->
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iolist_to_binary(string:sub_word(binary_to_list(B), N)).
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-spec sub_word(binary(), integer(), char()) -> binary().
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sub_word(B, N, C) ->
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iolist_to_binary(string:sub_word(binary_to_list(B), N, C)).
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-spec strip(binary()) -> binary().
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strip(B) ->
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iolist_to_binary(string:strip(binary_to_list(B))).
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-spec strip(binary(), both | left | right) -> binary().
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strip(B, D) ->
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iolist_to_binary(string:strip(binary_to_list(B), D)).
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-spec left(binary(), non_neg_integer()) -> binary().
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left(B, N) ->
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iolist_to_binary(string:left(binary_to_list(B), N)).
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-spec left(binary(), non_neg_integer(), char()) -> binary().
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left(B, N, C) ->
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iolist_to_binary(string:left(binary_to_list(B), N, C)).
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-spec right(binary(), non_neg_integer()) -> binary().
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right(B, N) ->
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iolist_to_binary(string:right(binary_to_list(B), N)).
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-spec right(binary(), non_neg_integer(), char()) -> binary().
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right(B, N, C) ->
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iolist_to_binary(string:right(binary_to_list(B), N, C)).
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-spec centre(binary(), non_neg_integer()) -> binary().
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centre(B, N) ->
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iolist_to_binary(string:centre(binary_to_list(B), N)).
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-spec centre(binary(), non_neg_integer(), char()) -> binary().
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centre(B, N, C) ->
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iolist_to_binary(string:centre(binary_to_list(B), N, C)).
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-spec sub_string(binary(), pos_integer()) -> binary().
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sub_string(B, N) ->
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iolist_to_binary(string:sub_string(binary_to_list(B), N)).
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-spec sub_string(binary(), pos_integer(), pos_integer()) -> binary().
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sub_string(B, S, E) ->
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iolist_to_binary(string:sub_string(binary_to_list(B), S, E)).
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-spec to_upper(binary()) -> binary();
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(char()) -> char().
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to_upper(B) when is_binary(B) ->
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iolist_to_binary(string:to_upper(binary_to_list(B)));
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to_upper(C) ->
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string:to_upper(C).
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-spec join([binary()], binary() | char()) -> binary().
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join(L, Sep) ->
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iolist_to_binary(join_s(L, Sep)).
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-spec substr(binary(), pos_integer()) -> binary().
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substr(B, N) ->
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binary_part(B, N-1, byte_size(B)-N+1).
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-spec chr(binary(), char()) -> non_neg_integer().
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chr(B, C) ->
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string:chr(binary_to_list(B), C).
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-spec chars(char(), non_neg_integer(), binary()) -> binary().
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chars(C, N, B) ->
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iolist_to_binary(string:chars(C, N, binary_to_list(B))).
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-spec chars(char(), non_neg_integer()) -> binary().
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chars(C, N) ->
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iolist_to_binary(string:chars(C, N)).
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-spec substr(binary(), pos_integer(), non_neg_integer()) -> binary().
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substr(B, S, E) ->
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binary_part(B, S-1, E).
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-spec strip(binary(), both | left | right, char()) -> binary().
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strip(B, D, C) ->
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iolist_to_binary(string:strip(binary_to_list(B), D, C)).
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-spec to_lower(binary()) -> binary();
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(char()) -> char().
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to_lower(B) when is_binary(B) ->
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iolist_to_binary(string:to_lower(binary_to_list(B)));
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to_lower(C) ->
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string:to_lower(C).
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-spec tokens(binary(), binary()) -> [binary()].
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tokens(B1, B2) ->
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[iolist_to_binary(T) ||
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T <- string:tokens(binary_to_list(B1), binary_to_list(B2))].
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-spec to_float(binary()) -> {float(), binary()} | {error, no_float}.
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to_float(B) ->
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case string:to_float(binary_to_list(B)) of
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{error, R} ->
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{error, R};
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{Float, Rest} ->
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{Float, iolist_to_binary(Rest)}
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end.
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-spec to_integer(binary()) -> {integer(), binary()} | {error, no_integer}.
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to_integer(B) ->
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case string:to_integer(binary_to_list(B)) of
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{error, R} ->
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{error, R};
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{Int, Rest} ->
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{Int, iolist_to_binary(Rest)}
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end.
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-spec prefix(binary(), binary()) -> boolean().
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prefix(Prefix, B) ->
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Size = byte_size(Prefix),
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case B of
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<<Prefix:Size/binary, _/binary>> ->
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true;
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_ ->
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false
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end.
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-spec suffix(binary(), binary()) -> boolean().
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suffix(B1, B2) ->
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lists:suffix(binary_to_list(B1), binary_to_list(B2)).
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-spec format(io:format(), list()) -> binary().
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format(Format, Args) ->
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iolist_to_binary(io_lib:format(Format, Args)).
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-spec sha(binary()) -> binary().
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sha(Text) ->
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Bin = crypto:hash(sha, Text),
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to_hexlist(Bin).
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-spec to_hexlist(binary()) -> binary().
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to_hexlist(S) when is_list(S) ->
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to_hexlist(iolist_to_binary(S));
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to_hexlist(Bin) when is_binary(Bin) ->
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<< <<(digit_to_xchar(N div 16)), (digit_to_xchar(N rem 16))>> || <<N>> <= Bin >>.
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%%%===================================================================
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%%% Internal functions
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%%%===================================================================
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join_s([], _Sep) ->
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[];
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join_s([H|T], Sep) ->
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[H, [[Sep, X] || X <- T]].
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digit_to_xchar(D) when (D >= 0) and (D < 10) -> D + $0;
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digit_to_xchar(D) -> D + $a - 10.
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