Merge: More lazyness in standard

[nit.git] / lib / standard / string.nit

diff --git a/lib/standard/string.nit b/lib/standard/string.nit
index 6a9f521..b99fc99 100644 (file)
--- a/lib/standard/string.nit
+++ b/lib/standard/string.nit
@@ -350,12 +350,12 @@ abstract class Text
        #
        #     assert " \n\thello \n\t".l_trim == "hello \n\t"
        #
-       # A whitespace is defined as any character which ascii value is less than or equal to 32
+       # `Char::is_whitespace` determines what is a whitespace.
        fun l_trim: SELFTYPE
        do
                var iter = self.chars.iterator
                while iter.is_ok do
-                       if iter.item.ascii > 32 then break
+                       if not iter.item.is_whitespace then break
                        iter.next
                end
                if iter.index == length then return self.empty
@@ -366,12 +366,12 @@ abstract class Text
        #
        #     assert " \n\thello \n\t".r_trim == " \n\thello"
        #
-       # A whitespace is defined as any character which ascii value is less than or equal to 32
+       # `Char::is_whitespace` determines what is a whitespace.
        fun r_trim: SELFTYPE
        do
                var iter = self.chars.reverse_iterator
                while iter.is_ok do
-                       if iter.item.ascii > 32 then break
+                       if not iter.item.is_whitespace then break
                        iter.next
                end
                if iter.index < 0 then return self.empty
@@ -379,12 +379,29 @@ abstract class Text
        end
 
        # Trims trailing and preceding white spaces
-       # A whitespace is defined as any character which ascii value is less than or equal to 32
        #
        #     assert "  Hello  World !  ".trim   == "Hello  World !"
        #     assert "\na\nb\tc\t".trim          == "a\nb\tc"
+       #
+       # `Char::is_whitespace` determines what is a whitespace.
        fun trim: SELFTYPE do return (self.l_trim).r_trim
 
+       # Is the string non-empty but only made of whitespaces?
+       #
+       #    assert " \n\t ".is_whitespace    == true
+       #    assert "  hello  ".is_whitespace == false
+       #    assert "".is_whitespace          == false
+       #
+       # `Char::is_whitespace` determines what is a whitespace.
+       fun is_whitespace: Bool
+       do
+               if is_empty then return false
+               for c in self.chars do
+                       if not c.is_whitespace then return false
+               end
+               return true
+       end
+
        # Returns `self` removed from its last line terminator (if any).
        #
        #    assert "Hello\n".chomp == "Hello"