kernel: add Char::is_whitespace

Signed-off-by: Jean Privat <jean@pryen.org>

diff --git a/lib/standard/kernel.nit b/lib/standard/kernel.nit
index 5cc0547..de12c93 100644 (file)
--- a/lib/standard/kernel.nit
+++ b/lib/standard/kernel.nit
@@ -699,6 +699,22 @@ universal Char
        do
                return is_lower or is_upper
        end
+
+       # Is self a whitespace character?
+       #
+       # These correspond to the "Other" and "Separator" groups of the Unicode.
+       #
+       # In the ASCII encoding, this is those <= to space (0x20) plus delete (0x7F).
+       #
+       #     assert 'A'.is_whitespace  == false
+       #     assert ','.is_whitespace  == false
+       #     assert ' '.is_whitespace  == true
+       #     assert '\t'.is_whitespace == true
+       fun is_whitespace: Bool
+       do
+               var i = ascii
+               return i <= 0x20 or i == 0x7F
+       end
 end
 
 # Pointer classes are used to manipulate extern C structures.