From b93e9b611056828ac2c82f225960aa29348ebe97 Mon Sep 17 00:00:00 2001
From: Andrew Bennett <potatosaladx@gmail.com>
Date: Wed, 10 Jun 2015 13:48:30 -0600
Subject: stdlib: Add BIF binary:split/2 and binary:split/3

---
 lib/stdlib/src/binary.erl | 77 +++++------------------------------------------
 1 file changed, 8 insertions(+), 69 deletions(-)

(limited to 'lib/stdlib/src')

diff --git a/lib/stdlib/src/binary.erl b/lib/stdlib/src/binary.erl
index af00410572..fb0c395d70 100644
--- a/lib/stdlib/src/binary.erl
+++ b/lib/stdlib/src/binary.erl
@@ -20,7 +20,7 @@
 -module(binary).
 %%
 %% Implemented in this module:
--export([split/2,split/3,replace/3,replace/4]).
+-export([replace/3,replace/4]).
 
 -export_type([cp/0]).
 
@@ -34,7 +34,8 @@
          decode_unsigned/2, encode_unsigned/1, encode_unsigned/2,
          first/1, last/1, list_to_bin/1, longest_common_prefix/1,
          longest_common_suffix/1, match/2, match/3, matches/2,
-         matches/3, part/2, part/3, referenced_byte_size/1]).
+         matches/3, part/2, part/3, referenced_byte_size/1,
+         split/2, split/3]).
 
 -spec at(Subject, Pos) -> byte() when
       Subject :: binary(),
@@ -198,19 +199,13 @@ part(_, _, _) ->
 referenced_byte_size(_) ->
     erlang:nif_error(undef).
 
-%%% End of BIFs.
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-%% split
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
 -spec split(Subject, Pattern) -> Parts when
       Subject :: binary(),
       Pattern :: binary() | [binary()] | cp(),
       Parts :: [binary()].
 
-split(H,N) ->
-    split(H,N,[]).
+split(_, _) ->
+    erlang:nif_error(undef).
 
 -spec split(Subject, Pattern, Options) -> Parts when
       Subject :: binary(),
@@ -219,53 +214,10 @@ split(H,N) ->
       Option :: {scope, part()} | trim | global | trim_all,
       Parts :: [binary()].
 
-split(Haystack,Needles,Options) ->
-    try
-	{Part,Global,Trim,TrimAll} =
-        get_opts_split(Options,{no,false,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,TrimAll)
-    catch
-	_:_ ->
-	    erlang:error(badarg)
-    end.
-
-do_split(H,[],N,true,_) when N >= byte_size(H) ->
-    [];
-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,TrimAll) ->
-    case binary:part(H,{N,A-N}) of
-	<<>> when TrimAll == true ->
-	    do_split(H,T,A+B,Trim,TrimAll);
-	<<>> ->
-	    Rest =  do_split(H,T,A+B,Trim,TrimAll),
-	    case {Trim, Rest} of
-		{true,[]} ->
-		    [];
-		_ ->
-		    [<<>> | Rest]
-	    end;
-	Oth ->
-	    [Oth | do_split(H,T,A+B,Trim,TrimAll)]
-    end.
+split(_, _, _) ->
+    erlang:nif_error(undef).
 
+%%% End of BIFs.
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% replace
@@ -352,19 +304,6 @@ splitat(H,N,[I|T]) ->
 %% Simple helper functions
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-get_opts_split([],{Part,Global,Trim,TrimAll}) ->
-    {Part,Global,Trim,TrimAll};
-get_opts_split([{scope,{A,B}} | T],{_Part,Global,Trim,TrimAll}) ->
-    get_opts_split(T,{{A,B},Global,Trim,TrimAll});
-get_opts_split([global | T],{Part,_Global,Trim,TrimAll}) ->
-    get_opts_split(T,{Part,true,Trim,TrimAll});
-get_opts_split([trim | T],{Part,Global,_Trim,TrimAll}) ->
-    get_opts_split(T,{Part,Global,true,TrimAll});
-get_opts_split([trim_all | T],{Part,Global,Trim,_TrimAll}) ->
-    get_opts_split(T,{Part,Global,Trim,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}) ->
-- 
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