diff options
Diffstat (limited to 'lib/stdlib')
| -rw-r--r-- | lib/stdlib/src/string.erl | 46 | ||||
| -rw-r--r-- | lib/stdlib/test/string_SUITE.erl | 40 |
2 files changed, 64 insertions, 22 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(), diff --git a/lib/stdlib/test/string_SUITE.erl b/lib/stdlib/test/string_SUITE.erl index fccd1bef95..a55c710d50 100644 --- a/lib/stdlib/test/string_SUITE.erl +++ b/lib/stdlib/test/string_SUITE.erl @@ -217,21 +217,39 @@ substr(Config) when is_list(Config) -> ?line {'EXIT',_} = (catch string:substr("1234", "1")), ok. -tokens(suite) -> - []; -tokens(doc) -> - []; tokens(Config) when is_list(Config) -> - ?line [] = string:tokens("",""), - ?line [] = string:tokens("abc","abc"), - ?line ["abc"] = string:tokens("abc", ""), - ?line ["1","2 34","4","5"] = string:tokens("1,2 34,4;5", ";,"), - %% invalid arg type - ?line {'EXIT',_} = (catch string:tokens('x,y', ",")), + [] = string:tokens("",""), + [] = string:tokens("abc","abc"), + ["abc"] = string:tokens("abc", ""), + ["1","2 34","45","5","6","7"] = do_tokens("1,2 34,45;5,;6;,7", ";,"), + %% invalid arg type - ?line {'EXIT',_} = (catch string:tokens("x,y", ',')), + {'EXIT',_} = (catch string:tokens('x,y', ",")), + {'EXIT',_} = (catch string:tokens("x,y", ',')), ok. +do_tokens(S0, Sep0) -> + [H|T] = Sep0, + S = [replace_sep(C, T, H) || C <- S0], + Sep = [H], + io:format("~p ~p\n", [S0,Sep0]), + io:format("~p ~p\n", [S,Sep]), + + Res = string:tokens(S0, Sep0), + Res = string:tokens(Sep0++S0, Sep0), + Res = string:tokens(S0++Sep0, Sep0), + + Res = string:tokens(S, Sep), + Res = string:tokens(Sep++S, Sep), + Res = string:tokens(S++Sep, Sep), + + Res. + +replace_sep(C, Seps, New) -> + case lists:member(C, Seps) of + true -> New; + false -> C + end. chars(suite) -> []; |