mirror of
https://github.com/processone/ejabberd.git
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150 lines
4.9 KiB
Erlang
150 lines
4.9 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_regexp.erl
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%%% Author : Badlop
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%%% Purpose : Frontend to Re and Regexp OTP modules
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%%% Created : 8 Dec 2011 by Badlop
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2018 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(ejabberd_regexp).
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-export([exec/2, run/2, split/2, replace/3, greplace/3, sh_to_awk/1]).
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exec({ReM, ReF, ReA}, {RgM, RgF, RgA}) ->
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try apply(ReM, ReF, ReA) catch
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error:undef -> apply(RgM, RgF, RgA);
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A:B -> {error, {A, B}}
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end.
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-spec run(binary(), binary()) -> match | nomatch | {error, any()}.
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run(String, Regexp) ->
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case exec({re, run, [String, Regexp, [{capture, none}]]},
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{regexp, first_match, [binary_to_list(String),
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binary_to_list(Regexp)]})
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of
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{match, _, _} -> match;
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{match, _} -> match;
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match -> match;
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nomatch -> nomatch;
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{error, Error} -> {error, Error}
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end.
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-spec split(binary(), binary()) -> [binary()].
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split(String, Regexp) ->
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case exec({re, split, [String, Regexp, [{return, binary}]]},
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{regexp, split, [binary_to_list(String),
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binary_to_list(Regexp)]})
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of
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{ok, FieldList} -> [iolist_to_binary(F) || F <- FieldList];
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{error, Error} -> throw(Error);
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A -> A
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end.
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-spec replace(binary(), binary(), binary()) -> binary().
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replace(String, Regexp, New) ->
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case exec({re, replace, [String, Regexp, New, [{return, binary}]]},
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{regexp, sub, [binary_to_list(String),
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binary_to_list(Regexp),
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binary_to_list(New)]})
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of
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{ok, NewString, _RepCount} -> iolist_to_binary(NewString);
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{error, Error} -> throw(Error);
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A -> A
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end.
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-spec greplace(binary(), binary(), binary()) -> binary().
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greplace(String, Regexp, New) ->
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case exec({re, replace, [String, Regexp, New, [global, {return, binary}]]},
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{regexp, sub, [binary_to_list(String),
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binary_to_list(Regexp),
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binary_to_list(New)]})
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of
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{ok, NewString, _RepCount} -> iolist_to_binary(NewString);
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{error, Error} -> throw(Error);
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A -> A
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end.
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%% This code was copied and adapted from xmerl_regexp.erl
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-spec sh_to_awk(binary()) -> binary().
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sh_to_awk(Sh) ->
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iolist_to_binary([<<"^(">>, sh_to_awk_1(Sh)]). %Fix the beginning
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sh_to_awk_1(<<"*", Sh/binary>>) -> %This matches any string
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[<<".*">>, sh_to_awk_1(Sh)];
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sh_to_awk_1(<<"?", Sh/binary>>) -> %This matches any character
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[$., sh_to_awk_1(Sh)];
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sh_to_awk_1(<<"[^]", Sh/binary>>) -> %This takes careful handling
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[<<"\\^">>, sh_to_awk_1(Sh)];
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%% Must move '^' to end.
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sh_to_awk_1(<<"[^", Sh/binary>>) ->
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[$[, sh_to_awk_2(Sh, true)];
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sh_to_awk_1(<<"[!", Sh/binary>>) ->
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[<<"[^">>, sh_to_awk_2(Sh, false)];
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sh_to_awk_1(<<"[", Sh/binary>>) ->
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[$[, sh_to_awk_2(Sh, false)];
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sh_to_awk_1(<<C:8, Sh/binary>>) -> %% Unspecialise everything else which is not an escape character.
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case sh_special_char(C) of
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true -> [$\\,C|sh_to_awk_1(Sh)];
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false -> [C|sh_to_awk_1(Sh)]
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end;
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sh_to_awk_1(<<>>) ->
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<<")$">>. %Fix the end
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sh_to_awk_2(<<"]", Sh/binary>>, UpArrow) ->
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[$]|sh_to_awk_3(Sh, UpArrow)];
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sh_to_awk_2(Sh, UpArrow) ->
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sh_to_awk_3(Sh, UpArrow).
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sh_to_awk_3(<<"]", Sh/binary>>, true) ->
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[<<"^]">>, sh_to_awk_1(Sh)];
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sh_to_awk_3(<<"]", Sh/binary>>, false) ->
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[$]|sh_to_awk_1(Sh)];
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sh_to_awk_3(<<C:8, Sh/binary>>, UpArrow) ->
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[C|sh_to_awk_3(Sh, UpArrow)];
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sh_to_awk_3(<<>>, true) ->
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[$^|sh_to_awk_1([])];
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sh_to_awk_3(<<>>, false) ->
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sh_to_awk_1([]).
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%% -type sh_special_char(char()) -> bool().
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%% Test if a character is a special character.
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sh_special_char($|) -> true;
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sh_special_char($*) -> true;
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sh_special_char($+) -> true;
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sh_special_char($?) -> true;
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sh_special_char($() -> true;
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sh_special_char($)) -> true;
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sh_special_char($\\) -> true;
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sh_special_char($^) -> true;
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sh_special_char($$) -> true;
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sh_special_char($.) -> true;
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sh_special_char($[) -> true;
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sh_special_char($]) -> true;
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sh_special_char($") -> true;
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sh_special_char(_C) -> false.
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