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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 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(binary).
%%
%% The following functions implemented as BIF's
%% binary:compile_pattern/1
%% binary:match/{2,3}
%% binary:matches/{2,3}
%% - Not yet:
%% binary:longest_common_prefix/1
%% binary:longest_common_suffix/1
%% binary:first/1
%% binary:last/1
%% binary:at/2
%% binary:part/{2,3}
%% binary:bin_to_list/{1,2,3}
%% binary:list_to_bin/1
%% binary:copy/{1,2}
%% binary:referenced_byte_size/1
%% binary:decode_unsigned/{1,2}
%%
%% Implemented in this module:
-export([split/2,split/3,replace/3,replace/4]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% split
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
split(H,N) ->
split(H,N,[]).
split(Haystack,Needles,Options) ->
try
{Part,Global,Trim} = get_opts_split(Options,{no,false,false}),
Moptlist = case Part of
no ->
[];
{A,B} ->
[{scope,{A,B}}]
end,
MList = if
Global ->
binary:matches(Haystack,Needles,Moptlist);
true ->
case binary:match(Haystack,Needles,Moptlist) of
nomatch -> [];
Match -> [Match]
end
end,
do_split(Haystack,MList,0,Trim)
catch
_:_ ->
erlang:error(badarg)
end.
do_split(H,[],N,true) when N >= byte_size(H) ->
[];
do_split(H,[],N,_) ->
[binary:part(H,{N,byte_size(H)-N})];
do_split(H,[{A,B}|T],N,Trim) ->
case binary:part(H,{N,A-N}) of
<<>> ->
Rest = do_split(H,T,A+B,Trim),
case {Trim, Rest} of
{true,[]} ->
[];
_ ->
[<<>> | Rest]
end;
Oth ->
[Oth | do_split(H,T,A+B,Trim)]
end.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% replace
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
replace(H,N,R) ->
replace(H,N,R,[]).
replace(Haystack,Needles,Replacement,Options) ->
try
true = is_binary(Replacement), % Make badarg instead of function clause
{Part,Global,Insert} = get_opts_replace(Options,{no,false,[]}),
Moptlist = case Part of
no ->
[];
{A,B} ->
[{scope,{A,B}}]
end,
MList = if
Global ->
binary:matches(Haystack,Needles,Moptlist);
true ->
case binary:match(Haystack,Needles,Moptlist) of
nomatch -> [];
Match -> [Match]
end
end,
ReplList = case Insert of
[] ->
Replacement;
Y when is_integer(Y) ->
splitat(Replacement,0,[Y]);
Li when is_list(Li) ->
splitat(Replacement,0,lists:sort(Li))
end,
erlang:iolist_to_binary(do_replace(Haystack,MList,ReplList,0))
catch
_:_ ->
erlang:error(badarg)
end.
do_replace(H,[],_,N) ->
[binary:part(H,{N,byte_size(H)-N})];
do_replace(H,[{A,B}|T],Replacement,N) ->
[binary:part(H,{N,A-N}),
if
is_list(Replacement) ->
do_insert(Replacement, binary:part(H,{A,B}));
true ->
Replacement
end
| do_replace(H,T,Replacement,A+B)].
do_insert([X],_) ->
[X];
do_insert([H|T],R) ->
[H,R|do_insert(T,R)].
splitat(H,N,[]) ->
[binary:part(H,{N,byte_size(H)-N})];
splitat(H,N,[I|T]) ->
[binary:part(H,{N,I-N})|splitat(H,I,T)].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Simple helper functions
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
get_opts_split([],{Part,Global,Trim}) ->
{Part,Global,Trim};
get_opts_split([{scope,{A,B}} | T],{_Part,Global,Trim}) ->
get_opts_split(T,{{A,B},Global,Trim});
get_opts_split([global | T],{Part,_Global,Trim}) ->
get_opts_split(T,{Part,true,Trim});
get_opts_split([trim | T],{Part,Global,_Trim}) ->
get_opts_split(T,{Part,Global,true});
get_opts_split(_,_) ->
throw(badopt).
get_opts_replace([],{Part,Global,Insert}) ->
{Part,Global,Insert};
get_opts_replace([{scope,{A,B}} | T],{_Part,Global,Insert}) ->
get_opts_replace(T,{{A,B},Global,Insert});
get_opts_replace([global | T],{Part,_Global,Insert}) ->
get_opts_replace(T,{Part,true,Insert});
get_opts_replace([{insert_replaced,N} | T],{Part,Global,_Insert}) ->
get_opts_replace(T,{Part,Global,N});
get_opts_replace(_,_) ->
throw(badopt).
|
