diff options
Diffstat (limited to 'lib/stdlib/src/io_lib.erl')
| -rw-r--r-- | lib/stdlib/src/io_lib.erl | 48 |
1 files changed, 33 insertions, 15 deletions
diff --git a/lib/stdlib/src/io_lib.erl b/lib/stdlib/src/io_lib.erl index b7ec848e1e..a9b6d4131e 100644 --- a/lib/stdlib/src/io_lib.erl +++ b/lib/stdlib/src/io_lib.erl @@ -72,7 +72,7 @@ -export([quote_atom/2, char_list/1, latin1_char_list/1, deep_char_list/1, deep_latin1_char_list/1, - printable_list/1, printable_latin1_list/1]). + printable_list/1, printable_latin1_list/1, printable_unicode_list/1]). %% Utilities for collecting characters. -export([collect_chars/3, collect_chars/4, @@ -533,27 +533,45 @@ printable_latin1_list(_) -> false. %Everything else is false %% Return true if CharList is a list of printable characters, else %% false. The notion of printable in Unicode terms is somewhat floating. %% Everything that is not a control character and not invalid unicode -%% will be considered printable. +%% will be considered printable. +%% What the user has noted as printable characters is what actually +%% specifies when this function will return true. If the VM is started +%% with +pc latin1, only the latin1 range will be deemed as printable +%% if on the other hand +pc unicode is given, all characters in the Unicode +%% character set are deemed printable. latin1 is default. -spec printable_list(Term) -> boolean() when Term :: term(). -printable_list([C|Cs]) when is_integer(C), C >= $\040, C =< $\176 -> - printable_list(Cs); -printable_list([C|Cs]) +printable_list(L) -> + %% There will be more alternatives returns from io:printable range + %% in the future. To not have a catch-all clause is deliberate. + case io:printable_range() of + latin1 -> + printable_latin1_list(L); + unicode -> + printable_unicode_list(L) + end. + +-spec printable_unicode_list(Term) -> boolean() when + Term :: term(). + +printable_unicode_list([C|Cs]) when is_integer(C), C >= $\040, C =< $\176 -> + printable_unicode_list(Cs); +printable_unicode_list([C|Cs]) when is_integer(C), C >= 16#A0, C < 16#D800; is_integer(C), C > 16#DFFF, C < 16#FFFE; is_integer(C), C > 16#FFFF, C =< 16#10FFFF -> - printable_list(Cs); -printable_list([$\n|Cs]) -> printable_list(Cs); -printable_list([$\r|Cs]) -> printable_list(Cs); -printable_list([$\t|Cs]) -> printable_list(Cs); -printable_list([$\v|Cs]) -> printable_list(Cs); -printable_list([$\b|Cs]) -> printable_list(Cs); -printable_list([$\f|Cs]) -> printable_list(Cs); -printable_list([$\e|Cs]) -> printable_list(Cs); -printable_list([]) -> true; -printable_list(_) -> false. %Everything else is false + printable_unicode_list(Cs); +printable_unicode_list([$\n|Cs]) -> printable_unicode_list(Cs); +printable_unicode_list([$\r|Cs]) -> printable_unicode_list(Cs); +printable_unicode_list([$\t|Cs]) -> printable_unicode_list(Cs); +printable_unicode_list([$\v|Cs]) -> printable_unicode_list(Cs); +printable_unicode_list([$\b|Cs]) -> printable_unicode_list(Cs); +printable_unicode_list([$\f|Cs]) -> printable_unicode_list(Cs); +printable_unicode_list([$\e|Cs]) -> printable_unicode_list(Cs); +printable_unicode_list([]) -> true; +printable_unicode_list(_) -> false. %Everything else is false %% List = nl() %% Return a list of characters to generate a newline. |