lib/rouge/lexers/yaml.rb in rouge-4.0.1 vs lib/rouge/lexers/yaml.rb in rouge-4.1.0

@@ -16,12 +16,10 @@
       def self.detect?(text)
         # look for the %YAML directive
         return true if text =~ /\A\s*%YAML/m
       end
 
-      SPECIAL_VALUES = Regexp.union(%w(true false null))
-
       # NB: Tabs are forbidden in YAML, which is why you see things
       # like /[ ]+/.
 
       # reset the indentation levels
       def reset_indent
@@ -338,10 +336,10 @@
           token Text
           push :plain_scalar_in_block_context_new_line
         end
 
         rule %r/[ ]+/, Str
-        rule SPECIAL_VALUES, Name::Constant
+        rule %r((true|false|null)\b), Keyword::Constant
         rule %r/\d+(?:\.\d+)?(?=(\r?\n)| +#)/, Literal::Number, :pop!
 
         # regular non-whitespace characters
         rule %r/[^\s:]+/, Str
       end