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-rw-r--r--lib/stdlib/src/string.erl46
1 files changed, 35 insertions, 11 deletions
diff --git a/lib/stdlib/src/string.erl b/lib/stdlib/src/string.erl
index f9b083a56d..f6903d1c3d 100644
--- a/lib/stdlib/src/string.erl
+++ b/lib/stdlib/src/string.erl
@@ -221,23 +221,47 @@ substr2([_|String], S) -> substr2(String, S-1).
Tokens :: [Token :: nonempty_string()].
tokens(S, Seps) ->
- tokens1(S, Seps, []).
+ case Seps of
+ [] ->
+ case S of
+ [] -> [];
+ [_|_] -> [S]
+ end;
+ [C] ->
+ tokens_single_1(reverse(S), C, []);
+ [_|_] ->
+ tokens_multiple_1(reverse(S), Seps, [])
+ end.
-tokens1([C|S], Seps, Toks) ->
+tokens_single_1([Sep|S], Sep, Toks) ->
+ tokens_single_1(S, Sep, Toks);
+tokens_single_1([C|S], Sep, Toks) ->
+ tokens_single_2(S, Sep, Toks, [C]);
+tokens_single_1([], _, Toks) ->
+ Toks.
+
+tokens_single_2([Sep|S], Sep, Toks, Tok) ->
+ tokens_single_1(S, Sep, [Tok|Toks]);
+tokens_single_2([C|S], Sep, Toks, Tok) ->
+ tokens_single_2(S, Sep, Toks, [C|Tok]);
+tokens_single_2([], _Sep, Toks, Tok) ->
+ [Tok|Toks].
+
+tokens_multiple_1([C|S], Seps, Toks) ->
case member(C, Seps) of
- true -> tokens1(S, Seps, Toks);
- false -> tokens2(S, Seps, Toks, [C])
+ true -> tokens_multiple_1(S, Seps, Toks);
+ false -> tokens_multiple_2(S, Seps, Toks, [C])
end;
-tokens1([], _Seps, Toks) ->
- reverse(Toks).
+tokens_multiple_1([], _Seps, Toks) ->
+ Toks.
-tokens2([C|S], Seps, Toks, Cs) ->
+tokens_multiple_2([C|S], Seps, Toks, Tok) ->
case member(C, Seps) of
- true -> tokens1(S, Seps, [reverse(Cs)|Toks]);
- false -> tokens2(S, Seps, Toks, [C|Cs])
+ true -> tokens_multiple_1(S, Seps, [Tok|Toks]);
+ false -> tokens_multiple_2(S, Seps, Toks, [C|Tok])
end;
-tokens2([], _Seps, Toks, Cs) ->
- reverse([reverse(Cs)|Toks]).
+tokens_multiple_2([], _Seps, Toks, Tok) ->
+ [Tok|Toks].
-spec chars(Character, Number) -> String when
Character :: char(),