%% %% %CopyrightBegin% %% %% Copyright Ericsson AB 2005-2009. 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(xmerl_ucs). -compile([verbose,report_warnings,warn_unused_vars]). %%% Conversion to/from IANA recognised character sets -export([to_unicode/2]). %%% Micellaneous predicates -export([is_iso10646/1, is_unicode/1, is_bmpchar/1, is_latin1/1, is_ascii/1, is_visible_latin1/1, is_visible_ascii/1, is_iso646_basic/1, is_incharset/2]). %%% Conversion to/from RFC-1345 style mnemonic strings consisting %%% of subsets of ISO-10646 with "escape" sequences. %-export([from_mnemonic/1, from_mnemonic/2]). %%% UCS-2, UCS-4, UTF-16, and UTF-8 encoding and decoding -export([to_ucs2be/1,from_ucs2be/1, from_ucs2be/2]). -export([to_ucs2le/1,from_ucs2le/1, from_ucs2le/2]). -export([to_ucs4be/1,from_ucs4be/1, from_ucs4be/2]). -export([to_ucs4le/1,from_ucs4le/1, from_ucs4le/2]). -export([to_utf16be/1, from_utf16be/1, from_utf16be/2]). -export([to_utf16le/1, from_utf16le/1, from_utf16le/2]). -export([to_utf8/1, from_utf8/1]). %%% NB: Non-canonical UTF-8 encodings and incorrectly used %%% surrogate-pair codes are disallowed by this code. There are %%% important security implications concerning them. DO NOT REMOVE %%% THE VARIOUS GUARDS AND TESTS THAT ENFORCE THIS POLICY. %%% Test if Ch is a legitimate ISO-10646 character code is_iso10646(Ch) when is_integer(Ch), Ch >= 0 -> if Ch < 16#D800 -> true; Ch < 16#E000 -> false; % Surrogates Ch < 16#FFFE -> true; Ch =< 16#FFFF -> false; % FFFE and FFFF (not characters) Ch =< 16#7FFFFFFF -> true; true -> false end; is_iso10646(_) -> false. %%% Test if Ch is a legitimate ISO-10646 character code capable of %%% being encoded in a UTF-16 string. is_unicode(Ch) when Ch < 16#110000 -> is_iso10646(Ch); is_unicode(_) -> false. %%% Test if Ch is a legitimate ISO-10646 character code belonging to %%% the basic multi-lingual plane (BMP). is_bmpchar(Ch) when is_integer(Ch), Ch >= 0 -> if Ch < 16#D800 -> true; Ch < 16#E000 -> false; % Surrogates Ch < 16#FFFE -> true; true -> false end; is_bmpchar(_) -> false. %%% Test for legitimate Latin-1 code is_latin1(Ch) when is_integer(Ch), Ch >= 0, Ch =< 255 -> true; is_latin1(_) -> false. %%% Test for legitimate ASCII code is_ascii(Ch) when is_integer(Ch), Ch >= 0, Ch =< 127 -> true; is_ascii(_) -> false. %%% Test for char an element of ISO-646.basic set is_iso646_basic(Ch) when is_integer(Ch), Ch >= $\s -> if Ch =< $Z -> %% Everything in this range except $# $$ and $@ if Ch > $$ -> Ch =/= $@; true -> Ch < $# end; %% Only $_ and $a .. $z in range above $Z Ch > $z -> false; Ch >= $a -> true; true -> Ch =:= $_ end; is_iso646_basic(_) -> false. %%% Test for char a visible Latin-1 char, i.e. a non-control Latin-1 char, %%% excepting non-break space (but including space). is_visible_latin1(Ch) when is_integer(Ch), Ch >= $\s -> if Ch =< $~ -> true; Ch >= 161 -> Ch =< 255 end; is_visible_latin1(_) -> false. %%% Test for char a visible ASCII char, i.e. a non-control ASCII char %%% (including space). is_visible_ascii(Ch) when is_integer(Ch), Ch >= $\s -> Ch =< $~; is_visible_ascii(_) -> false. %%% UCS-4, big and little endian versions, encoding and decoding to_ucs4be(List) when is_list(List) -> lists:flatmap(fun to_ucs4be/1, List); to_ucs4be(Ch) -> char_to_ucs4be(Ch). from_ucs4be(Bin) when is_binary(Bin) -> from_ucs4be(Bin,[],[]); from_ucs4be(List) -> from_ucs4be(list_to_binary(List),[],[]). from_ucs4be(Bin,Tail) when is_binary(Bin) -> from_ucs4be(Bin,[],Tail); from_ucs4be(List,Tail) -> from_ucs4be(list_to_binary(List),[],Tail). to_ucs4le(List) when is_list(List) -> lists:flatmap(fun to_ucs4le/1, List); to_ucs4le(Ch) -> char_to_ucs4le(Ch). from_ucs4le(Bin) when is_binary(Bin) -> from_ucs4le(Bin,[],[]); from_ucs4le(List) -> from_ucs4le(list_to_binary(List),[],[]). from_ucs4le(Bin,Tail) when is_binary(Bin) -> from_ucs4le(Bin,[],Tail); from_ucs4le(List,Tail) -> from_ucs4le(list_to_binary(List),[],Tail). %%% UCS-2, big and little endian versions, encoding and decoding to_ucs2be(List) when is_list(List) -> lists:flatmap(fun to_ucs2be/1, List); to_ucs2be(Ch) -> char_to_ucs2be(Ch). from_ucs2be(Bin) when is_binary(Bin) -> from_ucs2be(Bin,[],[]); from_ucs2be(List) -> from_ucs2be(list_to_binary(List),[],[]). from_ucs2be(Bin,Tail) when is_binary(Bin) -> from_ucs2be(Bin,[],Tail); from_ucs2be(List,Tail) -> from_ucs2be(list_to_binary(List),[],Tail). to_ucs2le(List) when is_list(List) -> lists:flatmap(fun to_ucs2le/1, List); to_ucs2le(Ch) -> char_to_ucs2le(Ch). from_ucs2le(Bin) when is_binary(Bin) -> from_ucs2le(Bin,[],[]); from_ucs2le(List) -> from_ucs2le(list_to_binary(List),[],[]). from_ucs2le(Bin,Tail) when is_binary(Bin) -> from_ucs2le(Bin,[],Tail); from_ucs2le(List,Tail) -> from_ucs2le(list_to_binary(List),[],Tail). %%% UTF-16, big and little endian versions, encoding and decoding to_utf16be(List) when is_list(List) -> lists:flatmap(fun to_utf16be/1, List); to_utf16be(Ch) -> char_to_utf16be(Ch). from_utf16be(Bin) when is_binary(Bin) -> from_utf16be(Bin,[],[]); from_utf16be(List) -> from_utf16be(list_to_binary(List),[],[]). from_utf16be(Bin,Tail) when is_binary(Bin) -> from_utf16be(Bin,[],Tail); from_utf16be(List,Tail) -> from_utf16be(list_to_binary(List),[],Tail). to_utf16le(List) when is_list(List) -> lists:flatmap(fun to_utf16le/1, List); to_utf16le(Ch) -> char_to_utf16le(Ch). from_utf16le(Bin) when is_binary(Bin) -> from_utf16le(Bin,[],[]); from_utf16le(List) -> from_utf16le(list_to_binary(List),[],[]). from_utf16le(Bin,Tail) when is_binary(Bin) -> from_utf16le(Bin,[],Tail); from_utf16le(List,Tail) -> from_utf16le(list_to_binary(List),[],Tail). %%% UTF-8 encoding and decoding to_utf8(List) when is_list(List) -> lists:flatmap(fun to_utf8/1, List); to_utf8(Ch) -> char_to_utf8(Ch). from_utf8(Bin) when is_binary(Bin) -> from_utf8(binary_to_list(Bin)); from_utf8(List) -> case expand_utf8(List) of {Result,0} -> Result; {_Res,_NumBadChar} -> exit({ucs,{bad_utf8_character_code}}) end. %%% UCS-4 support %%% Possible errors encoding UCS-4: %%% - Non-character values (something other than 0 .. 2^31-1) %%% - Surrogate-pair code in string. %%% - 16#FFFE or 16#FFFF character in string. %%% Possible errors decoding UCS-4: %%% - Element out of range (i.e. the "sign" bit is set). %%% - Surrogate-pair code in string. %%% - 16#FFFE or 16#FFFF character in string. char_to_ucs4be(Ch) -> true = is_iso10646(Ch), [(Ch bsr 24), (Ch bsr 16) band 16#FF, (Ch bsr 8) band 16#FF, Ch band 16#FF]. from_ucs4be(<<Ch:32/big-signed-integer, Rest/binary>>,Acc,Tail) -> if Ch < 0; Ch >= 16#D800, Ch < 16#E000; Ch =:= 16#FFFE; Ch =:= 16#FFFF -> exit({bad_character_code,Ch}); true -> from_ucs4be(Rest,[Ch|Acc],Tail) end; from_ucs4be(<<>>,Acc,Tail) -> lists:reverse(Acc,Tail); from_ucs4be(Bin,Acc,Tail) -> io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]), {error,not_ucs4be}. char_to_ucs4le(Ch) -> true = is_iso10646(Ch), [Ch band 16#FF, (Ch bsr 8) band 16#FF, (Ch bsr 16) band 16#FF, (Ch bsr 24)]. from_ucs4le(<<Ch:32/little-signed-integer, Rest/binary>>,Acc,Tail) -> if Ch < 0; Ch >= 16#D800, Ch < 16#E000; Ch =:= 16#FFFE; Ch =:= 16#FFFF -> exit({bad_character_code,Ch}); true -> from_ucs4le(Rest,[Ch|Acc],Tail) end; from_ucs4le(<<>>,Acc,Tail) -> lists:reverse(Acc,Tail); from_ucs4le(Bin,Acc,Tail) -> io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]), {error,not_ucs4le}. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% UCS-2 support %%% FIXME! Don't know how to encode UCS-2!! %%% Currently I just encode as UCS-4, but strips the 16 higher bits. char_to_ucs2be(Ch) -> true = is_iso10646(Ch), [(Ch bsr 8) band 16#FF, Ch band 16#FF]. from_ucs2be(<<Ch:16/big-signed-integer, Rest/binary>>,Acc,Tail) -> if Ch < 0; Ch >= 16#D800, Ch < 16#E000; Ch =:= 16#FFFE; Ch =:= 16#FFFF -> exit({bad_character_code,Ch}); true -> from_ucs2be(Rest,[Ch|Acc],Tail) end; from_ucs2be(<<>>,Acc,Tail) -> lists:reverse(Acc,Tail); from_ucs2be(Bin,Acc,Tail) -> io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]), {error,not_ucs2be}. char_to_ucs2le(Ch) -> true = is_iso10646(Ch), [(Ch bsr 16) band 16#FF, (Ch bsr 24)]. from_ucs2le(<<Ch:16/little-signed-integer, Rest/binary>>,Acc,Tail) -> if Ch < 0; Ch >= 16#D800, Ch < 16#E000; Ch =:= 16#FFFE; Ch =:= 16#FFFF -> exit({bad_character_code,Ch}); true -> from_ucs4le(Rest,[Ch|Acc],Tail) end; from_ucs2le(<<>>,Acc,Tail) -> lists:reverse(Acc,Tail); from_ucs2le(Bin,Acc,Tail) -> io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]), {error,not_ucs2le}. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% UTF-16 support %%% Possible errors encoding UTF-16 %%% - Non-character values (something other than 0 .. 2^31-1) %%% - Surrogate-pair code in string. %%% - 16#FFFE or 16#FFFF character in string. %%% NB: the UCS replacement char (U+FFFD) will be quietly substituted %%% for unrepresentable chars (i.e. those geq to 2^20+2^16). %%% Possible errors decoding UTF-16: %%% - Unmatched surrogate-pair code in string. %%% - 16#FFFE or 16#FFFF character in string. char_to_utf16be(Ch) when is_integer(Ch), Ch >= 0 -> if Ch =< 16#FFFF -> if Ch < 16#D800; Ch >= 16#E000, Ch < 16#FFFE -> [Ch bsr 8, Ch band 16#FF] end; Ch < 16#110000 -> %% Encode with surrogate pair X = Ch - 16#10000, [16#D8 + (X bsr 18), (X bsr 10) band 16#FF, 16#DC + ((X bsr 8) band 3), X band 16#FF]; Ch =< 16#7FFFFFFF -> %% Unrepresentable char: use REPLACEMENT CHARACTER (U+FFFD) [16#FF, 16#FD] end. from_utf16be(<<Ch:16/big-unsigned-integer, Rest/binary>>, Acc, Tail) when Ch < 16#D800; Ch > 16#DFFF -> if Ch < 16#FFFE -> from_utf16be(Rest,[Ch|Acc],Tail) end; from_utf16be(<<Hi:16/big-unsigned-integer, Lo:16/big-unsigned-integer, Rest/binary>>, Acc, Tail) when Hi >= 16#D800, Hi < 16#DC00, Lo >= 16#DC00, Lo =< 16#DFFF -> %% Surrogate pair Ch = ((Hi band 16#3FF) bsl 10) + (Lo band 16#3FF) + 16#10000, from_utf16be(Rest, [Ch|Acc], Tail); from_utf16be(<<>>,Acc,Tail) -> lists:reverse(Acc,Tail); from_utf16be(Bin,Acc,Tail) -> io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]), {error,not_utf16be}. char_to_utf16le(Ch) when is_integer(Ch), Ch >= 0 -> if Ch =< 16#FFFF -> if Ch < 16#D800; Ch >= 16#E000, Ch < 16#FFFE -> [Ch band 16#FF, Ch bsr 8] end; Ch < 16#110000 -> %% Encode with surrogate pair X = Ch - 16#10000, [(X bsr 10) band 16#FF, 16#D8 + (X bsr 18), X band 16#FF, 16#DC + ((X bsr 8) band 3)]; Ch =< 16#7FFFFFFF -> %% Unrepresentable char: use REPLACEMENT CHARACTER (U+FFFD) [16#FD, 16#FF] end. from_utf16le(<<Ch:16/little-unsigned-integer, Rest/binary>>, Acc, Tail) when Ch < 16#D800; Ch > 16#DFFF -> if Ch < 16#FFFE -> from_utf16le(Rest, [Ch|Acc], Tail) end; from_utf16le(<<Hi:16/little-unsigned-integer, Lo:16/little-unsigned-integer, Rest/binary>>, Acc, Tail) when Hi >= 16#D800, Hi < 16#DC00, Lo >= 16#DC00, Lo =< 16#DFFF -> %% Surrogate pair Ch = ((Hi band 16#3FF) bsl 10) + (Lo band 16#3FF) + 16#10000, from_utf16le(Rest, [Ch|Acc], Tail); from_utf16le(<<>>,Acc,Tail) -> lists:reverse(Acc,Tail); from_utf16le(Bin,Acc,Tail) -> io:format("ucs Error: Bin=~p~n Acc=~p~n Tail=~p~n",[Bin,Acc,Tail]), {error,not_utf16le}. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% UTF-8 support %%% Possible errors encoding UTF-8: %%% - Non-character values (something other than 0 .. 2^31-1). %%% - Surrogate pair code in string. %%% - 16#FFFE or 16#FFFF character in string. %%% Possible errors decoding UTF-8: %%% - 10xxxxxx or 1111111x as initial byte. %%% - Insufficient number of 10xxxxxx octets following an initial octet of %%% multi-octet sequence. %%% - Non-canonical encoding used. %%% - Surrogate-pair code encoded as UTF-8. %%% - 16#FFFE or 16#FFFF character in string. char_to_utf8(Ch) when is_integer(Ch), Ch >= 0 -> if Ch < 128 -> %% 0yyyyyyy [Ch]; Ch < 16#800 -> %% 110xxxxy 10yyyyyy [16#C0 + (Ch bsr 6), 128+(Ch band 16#3F)]; Ch < 16#10000 -> %% 1110xxxx 10xyyyyy 10yyyyyy if Ch < 16#D800; Ch > 16#DFFF, Ch < 16#FFFE -> [16#E0 + (Ch bsr 12), 128+((Ch bsr 6) band 16#3F), 128+(Ch band 16#3F)] end; Ch < 16#200000 -> %% 11110xxx 10xxyyyy 10yyyyyy 10yyyyyy [16#F0+(Ch bsr 18), 128+((Ch bsr 12) band 16#3F), 128+((Ch bsr 6) band 16#3F), 128+(Ch band 16#3F)]; Ch < 16#4000000 -> %% 111110xx 10xxxyyy 10yyyyyy 10yyyyyy 10yyyyyy [16#F8+(Ch bsr 24), 128+((Ch bsr 18) band 16#3F), 128+((Ch bsr 12) band 16#3F), 128+((Ch bsr 6) band 16#3F), 128+(Ch band 16#3F)]; Ch < 16#80000000 -> %% 1111110x 10xxxxyy 10yyyyyy 10yyyyyy 10yyyyyy 10yyyyyy [16#FC+(Ch bsr 30), 128+((Ch bsr 24) band 16#3F), 128+((Ch bsr 18) band 16#3F), 128+((Ch bsr 12) band 16#3F), 128+((Ch bsr 6) band 16#3F), 128+(Ch band 16#3F)] end. %% expand_utf8([Byte]) -> {[UnicodeChar],NumberOfBadBytes} %% Expand UTF8 byte sequences to ISO 10646/Unicode %% charactes. Any illegal bytes are removed and the number of %% bad bytes are returned. %% %% Reference: %% RFC 3629: "UTF-8, a transformation format of ISO 10646". expand_utf8(Str) -> expand_utf8_1(Str, [], 0). expand_utf8_1([C|Cs], Acc, Bad) when C < 16#80 -> %% Plain Ascii character. expand_utf8_1(Cs, [C|Acc], Bad); expand_utf8_1([C1,C2|Cs], Acc, Bad) when C1 band 16#E0 =:= 16#C0, C2 band 16#C0 =:= 16#80 -> case ((C1 band 16#1F) bsl 6) bor (C2 band 16#3F) of C when 16#80 =< C -> expand_utf8_1(Cs, [C|Acc], Bad); _ -> %% Bad range. expand_utf8_1(Cs, Acc, Bad+1) end; expand_utf8_1([C1,C2,C3|Cs], Acc, Bad) when C1 band 16#F0 =:= 16#E0, C2 band 16#C0 =:= 16#80, C3 band 16#C0 =:= 16#80 -> case ((((C1 band 16#0F) bsl 6) bor (C2 band 16#3F)) bsl 6) bor (C3 band 16#3F) of C when 16#800 =< C -> expand_utf8_1(Cs, [C|Acc], Bad); _ -> %% Bad range. expand_utf8_1(Cs, Acc, Bad+1) end; expand_utf8_1([C1,C2,C3,C4|Cs], Acc, Bad) when C1 band 16#F8 =:= 16#F0, C2 band 16#C0 =:= 16#80, C3 band 16#C0 =:= 16#80, C4 band 16#C0 =:= 16#80 -> case ((((((C1 band 16#0F) bsl 6) bor (C2 band 16#3F)) bsl 6) bor (C3 band 16#3F)) bsl 6) bor (C4 band 16#3F) of C when 16#10000 =< C -> expand_utf8_1(Cs, [C|Acc], Bad); _ -> %% Bad range. expand_utf8_1(Cs, Acc, Bad+1) end; expand_utf8_1([_|Cs], Acc, Bad) -> %% Ignore bad character. expand_utf8_1(Cs, Acc, Bad+1); expand_utf8_1([], Acc, Bad) -> {lists:reverse(Acc),Bad}. %%% ---------------------------------------------------------------------------- %%% Translation to/from any IANA defined character set, given that a mapping %%% exists. Don't care about validating valid subsets of Unicode to_unicode(Input,Cs) when Cs=='ansi_x3.4-1968';Cs=='iso-ir-6'; Cs=='ansi_x3.4-1986';Cs=='iso_646.irv:1991'; Cs=='ascii';Cs=='iso646-us';Cs=='us-ascii';Cs=='us'; Cs=='ibm367';Cs=='cp367';Cs=='csascii' -> % US-ASCII Input; to_unicode(Input,Cs) when Cs=='iso-10646-utf-1';Cs=='csiso10646utf1' -> Input; to_unicode(Input,Cs) when Cs=='iso_646.basic:1983';Cs=='ref'; Cs=='csiso646basic1983' -> Input; to_unicode(Input,Cs) when Cs=='iso_8859-1:1987';Cs=='iso-ir-100'; Cs=='iso_8859-1';Cs=='iso-8859-1';Cs=='latin1'; Cs=='l1';Cs=='ibm819'; Cs=='cp819';Cs=='csisolatin1' -> Input; % to_unicode(Input,Cs) when Cs=='mnemonic';Cs=='"mnemonic+ascii+38'; % Cs=='mnem';Cs=='"mnemonic+ascii+8200' -> % from_mnemonic(Input); to_unicode(Input,Cs) when Cs=='iso-10646-ucs-2';Cs=='csunicode' -> from_ucs2be(Input); % Guess byteorder to_unicode(Input,Cs) when Cs=='iso-10646-ucs-4';Cs=='csucs4' -> from_ucs4be(Input); % Guess byteorder to_unicode(Input,Cs) when Cs=='utf-16be';Cs=='utf-16' -> from_utf16be(Input); to_unicode(Input,'utf-16le') -> from_utf16le(Input); to_unicode(Input,'utf-8') -> from_utf8(Input); to_unicode(Input,Charset) -> exit({bad_character_code,Input,Charset}). %ucs_data:to_unicode(Input,Charset). %%% Tests if Char is in Charset. %%% Do this by trying to convert it into unicode, if possible a mapping was %%% found and we are ok. is_incharset(In,Cs) when Cs=='ansi_x3.4-1968';Cs=='iso-ir-6'; Cs=='ansi_x3.4-1986';Cs=='iso_646.irv:1991'; Cs=='ascii';Cs=='iso646-us';Cs=='us-ascii';Cs=='us'; Cs=='ibm367';Cs=='cp367';Cs=='csascii' -> % US-ASCII if is_integer(In) -> is_ascii(In); is_list(In) -> test_charset(fun is_ascii/1,In) end; is_incharset(In,Cs) when Cs=='iso-10646-utf-1';Cs=='csiso10646utf1' -> if is_integer(In) -> is_unicode(In); is_list(In) -> test_charset(fun is_unicode/1, In) end; is_incharset(In,Cs) when Cs=='iso_646.basic:1983';Cs=='ref'; Cs=='csiso646basic1983' -> if is_integer(In) -> is_iso646_basic(In); is_list(In) -> test_charset(fun is_iso646_basic/1, In) end; is_incharset(In,Cs) when Cs=='iso_8859-1:1987';Cs=='iso-ir-100'; Cs=='iso_8859-1';Cs=='iso-8859-1'; Cs=='latin1';Cs=='l1';Cs=='ibm819'; Cs=='cp819';Cs=='csisolatin1' -> if is_integer(In) -> is_latin1(In); is_list(In) -> test_charset(fun is_latin1/1, In) end; is_incharset(In,Charset) when is_integer(In) -> case to_unicode([In],Charset) of {error,unsupported_charset} -> {error,unsupported_charset}; {error,_} -> false; [Int] when is_integer(Int) -> true end; is_incharset(In,Charset) when is_list(In) -> case to_unicode(In,Charset) of {error,unsupported_charset} -> {error,unsupported_charset}; {error,_} -> false; [Int] when is_integer(Int) -> true end. test_charset(Fun,Input) -> case lists:all(Fun, Input) of true -> true; _ -> false end.