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-rw-r--r--lib/stdlib/src/string.erl71
-rw-r--r--lib/stdlib/test/string_SUITE.erl84
2 files changed, 128 insertions, 27 deletions
diff --git a/lib/stdlib/src/string.erl b/lib/stdlib/src/string.erl
index 4fdfe99b66..a0fa60fbc7 100644
--- a/lib/stdlib/src/string.erl
+++ b/lib/stdlib/src/string.erl
@@ -61,6 +61,8 @@
next_codepoint/1, next_grapheme/1
]).
+-export([to_float/1, to_integer/1]).
+
%% Old (will be deprecated) lists/string API kept for backwards compability
-export([len/1, concat/2, % equal/2, (extended in the new api)
chr/2,rchr/2,str/2,rstr/2,
@@ -80,26 +82,28 @@
-type grapheme_cluster() :: char() | [char()].
-type direction() :: 'leading' | 'trailing'.
-%%% BIFs
--export([to_float/1, to_integer/1]).
-dialyzer({no_improper_lists, stack/2}).
+%%% BIFs internal (not documented) should not to be used outside of this module
+%%% May be removed
+-export([list_to_float/1, list_to_integer/1]).
--spec to_float(String) -> {Float, Rest} | {error, Reason} when
+%% Uses bifs: string:list_to_float/1 and string:list_to_integer/1
+-spec list_to_float(String) -> {Float, Rest} | {'error', Reason} when
String :: string(),
Float :: float(),
Rest :: string(),
- Reason :: no_float | not_a_list.
+ Reason :: 'no_float' | 'not_a_list'.
-to_float(_) ->
+list_to_float(_) ->
erlang:nif_error(undef).
--spec to_integer(String) -> {Int, Rest} | {error, Reason} when
+-spec list_to_integer(String) -> {Int, Rest} | {'error', Reason} when
String :: string(),
Int :: integer(),
Rest :: string(),
- Reason :: no_integer | not_a_list.
+ Reason :: 'no_integer' | 'not_a_list'.
-to_integer(_) ->
+list_to_integer(_) ->
erlang:nif_error(undef).
%%% End of BIFs
@@ -335,6 +339,57 @@ casefold(CD) when is_list(CD) ->
casefold(CD) when is_binary(CD) ->
casefold_bin(CD,<<>>).
+-spec to_integer(String) -> {Int, Rest} | {'error', Reason} when
+ String :: unicode:chardata(),
+ Int :: integer(),
+ Rest :: unicode:chardata(),
+ Reason :: 'no_integer' | badarg.
+
+to_integer(String) ->
+ try take(String, "+-0123456789") of
+ {Head, Tail} ->
+ case is_empty(Head) of
+ true -> {error, no_integer};
+ false ->
+ List = unicode:characters_to_list(Head),
+ case string:list_to_integer(List) of
+ {error, _} = Err -> Err;
+ {Int, Rest} ->
+ to_number(String, Int, Rest, List, Tail)
+ end
+ end
+ catch _:_ -> {error, badarg}
+ end.
+
+-spec to_float(String) -> {Float, Rest} | {'error', Reason} when
+ String :: unicode:chardata(),
+ Float :: float(),
+ Rest :: unicode:chardata(),
+ Reason :: 'no_float' | 'badarg'.
+
+to_float(String) ->
+ try take(String, "+-0123456789eE.,") of
+ {Head, Tail} ->
+ case is_empty(Head) of
+ true -> {error, no_float};
+ false ->
+ List = unicode:characters_to_list(Head),
+ case string:list_to_float(List) of
+ {error, _} = Err -> Err;
+ {Float, Rest} ->
+ to_number(String, Float, Rest, List, Tail)
+ end
+ end
+ catch _:_ -> {error, badarg}
+ end.
+
+to_number(String, Number, Rest, List, _Tail) when is_binary(String) ->
+ BSz = length(List)-length(Rest),
+ <<_:BSz/binary, Cont/binary>> = String,
+ {Number, Cont};
+to_number(_, Number, Rest, _, Tail) ->
+ {Number, concat(Rest,Tail)}.
+
%% Return the remaining string with prefix removed or else nomatch
-spec prefix(String::unicode:chardata(), Prefix::unicode:chardata()) ->
'nomatch' | unicode:chardata().
diff --git a/lib/stdlib/test/string_SUITE.erl b/lib/stdlib/test/string_SUITE.erl
index a78ddf761b..fe00b7ff91 100644
--- a/lib/stdlib/test/string_SUITE.erl
+++ b/lib/stdlib/test/string_SUITE.erl
@@ -34,6 +34,7 @@
equal/1,
pad/1, trim/1, chomp/1, take/1,
uppercase/1, lowercase/1, titlecase/1, casefold/1,
+ to_integer/1,to_float/1,
prefix/1, split/1, replace/1, find/1,
lexemes/1, nth_lexeme/1, cd_gc/1, meas/1
]).
@@ -42,7 +43,7 @@
-export([span_cspan/1,substr/1,old_tokens/1,chars/1]).
-export([copies/1,words/1,strip/1,sub_word/1,left_right/1]).
-export([sub_string/1,centre/1, join/1]).
--export([to_integer/1,to_float/1]).
+-export([old_to_integer/1,old_to_float/1]).
-export([to_upper_to_lower/1]).
%% Run tests when debugging them
@@ -61,14 +62,15 @@ groups() ->
equal, reverse, slice,
pad, trim, chomp, take,
lexemes, nth_lexeme,
+ to_integer, to_float,
uppercase, lowercase, titlecase, casefold,
prefix, find, split, replace, cd_gc,
meas]},
{list_string,
[len, old_equal, old_concat, chr_rchr, str_rstr, span_cspan,
substr, old_tokens, chars, copies, words, strip, sub_word,
- left_right, sub_string, centre, join, to_integer,
- to_float, to_upper_to_lower]}].
+ left_right, sub_string, centre, join, old_to_integer,
+ old_to_float, to_upper_to_lower]}].
init_per_suite(Config) ->
Config.
@@ -456,6 +458,31 @@ casefold(_) ->
?TEST("İ I WITH DOT ABOVE", [], "i̇ i with dot above"),
ok.
+
+to_integer(_) ->
+ ?TEST("", [], {error, no_integer}),
+ ?TEST("-", [], {error, no_integer}),
+ ?TEST("01", [], {1, ""}),
+ ?TEST("1.53", [], {1, ".53"}),
+ ?TEST("+01.53", [], {1, ".53"}),
+ ?TEST("-1.53", [], {-1, ".53"}),
+ ?TEST("-13#16FF", [], {-13, "#16FF"}),
+ ?TEST("13xFF", [], {13, "xFF"}),
+ ?TEST(["234", <<"3+4-234">>], [], {2343, "+4-234"}),
+ ok.
+
+to_float(_) ->
+ ?TEST("", [], {error, no_float}),
+ ?TEST("1.53", [], {1.53, ""}),
+ ?TEST("+01.53foo", [], {1.53, "foo"}),
+ ?TEST("-1.53foo", [], {-1.53, "foo"}),
+ ?TEST("-1,53foo", [], {-1.53, "foo"}),
+ ?TEST("-1,53e1foo", [], {-15.3, "foo"}),
+ ?TEST("-1,53e-1", [], {-0.153, ""}),
+ ?TEST("-1,53E-1+2", [], {-0.153, "+2"}),
+ ?TEST(["-1,53", <<"E-1+2">>], [], {-0.153, "+2"}),
+ ok.
+
prefix(_) ->
?TEST("", ["a"], nomatch),
?TEST("a", [""], "a"),
@@ -848,6 +875,8 @@ check_types_1({list, deep}, _) ->
ok;
check_types_1({list, {list, deep}}, _) ->
ok;
+check_types_1(_, {error,_}) ->
+ ok;
check_types_1(T1,T2) ->
{T1,T2}.
@@ -876,6 +905,11 @@ type(List) when is_list(List) ->
false -> mixed
end
end;
+type({Number, String}) when is_number(Number) ->
+ %% to_integer or to_float
+ type(String);
+type({Atom, _}=What) when is_atom(Atom) ->
+ What;
type({R1,R2}) ->
case {type(R1),type(R2)} of
{T,T} -> T;
@@ -1192,7 +1226,7 @@ centre(Config) when is_list(Config) ->
{'EXIT',_} = (catch string:centre(hello, 10)),
ok.
-to_integer(Config) when is_list(Config) ->
+old_to_integer(Config) when is_list(Config) ->
{1,""} = test_to_integer("1"),
{1,""} = test_to_integer("+1"),
{-1,""} = test_to_integer("-1"),
@@ -1205,9 +1239,10 @@ to_integer(Config) when is_list(Config) ->
{error,no_integer} = test_to_integer(""),
{error,no_integer} = test_to_integer("!1"),
{error,no_integer} = test_to_integer("F1"),
- {error,not_a_list} = test_to_integer('23'),
- {3,[[]]} = test_to_integer([$3,[]]),
- {3,[hello]} = test_to_integer([$3,hello]),
+ {error,badarg} = test_to_integer('23'),
+ %% {3,[[]]} = test_to_integer([$3,[]]),
+ %% {3,[hello]} = test_to_integer([$3,hello]),
+ {error,badarg} = test_to_integer([$3,hello]),
ok.
test_to_integer(Str) ->
@@ -1221,7 +1256,7 @@ test_to_integer(Str) ->
Res
end.
-to_float(Config) when is_list(Config) ->
+old_to_float(Config) when is_list(Config) ->
{1.2,""} = test_to_float("1.2"),
{1.2,""} = test_to_float("1,2"),
{120.0,""} = test_to_float("1.2e2"),
@@ -1248,9 +1283,11 @@ to_float(Config) when is_list(Config) ->
{error,no_float} = test_to_float("1"),
{error,no_float} = test_to_float("1e"),
{error,no_float} = test_to_float("2."),
- {error,not_a_list} = test_to_float('2.3'),
- {2.3,[[]]} = test_to_float([$2,$.,$3,[]]),
- {2.3,[hello]} = test_to_float([$2,$.,$3,hello]),
+ {error,badarg} = test_to_float('2.3'),
+ %{2.3,[[]]} = test_to_float([$2,$.,$3,[]]),
+ {2.3,[]} = test_to_float([$2,$.,$3,[]]),
+ %%{2.3,[hello]} = test_to_float([$2,$.,$3,hello]),
+ {error, badarg} = test_to_float([$2,$.,$3,hello]),
ok.
test_to_float(Str) ->
@@ -1265,23 +1302,32 @@ test_to_float(Str) ->
end.
to_upper_to_lower(Config) when is_list(Config) ->
- "1234ABCDEFÅÄÖ=" = string:to_upper("1234abcdefåäö="),
- "éèíúùòóåäöabc()" = string:to_lower("ÉÈÍÚÙÒÓÅÄÖabc()"),
+ "1234ABCDEFÅÄÖ=" = string_to_upper("1234abcdefåäö="),
+ "éèíúùòóåäöabc()" = string_to_lower("ÉÈÍÚÙÒÓÅÄÖabc()"),
All = lists:seq(0, 255),
- UC = string:to_upper(All),
+ UC = string_to_upper(All),
256 = erlang:length(UC),
all_upper_latin1(UC, 0),
- LC = string:to_lower(All),
+ LC = string_to_lower(All),
all_lower_latin1(LC, 0),
- LC = string:to_lower(string:to_upper(LC)),
- LC = string:to_lower(string:to_upper(UC)),
- UC = string:to_upper(string:to_lower(LC)),
- UC = string:to_upper(string:to_lower(UC)),
+ LC = string_to_lower(string_to_upper(LC)),
+ LC = string_to_lower(string_to_upper(UC)),
+ UC = string_to_upper(string_to_lower(LC)),
+ UC = string_to_upper(string_to_lower(UC)),
+
ok.
+string_to_lower(Str) ->
+ Res = string:to_lower(Str),
+ Res = [string:to_lower(C) || C <- Str].
+
+string_to_upper(Str) ->
+ Res = string:to_upper(Str),
+ Res = [string:to_upper(C) || C <- Str].
+
all_upper_latin1([C|T], C) when 0 =< C, C < $a;
$z < C, C < 16#E0;
C =:= 16#F7; C =:= 16#FF ->
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