Added recognition of keys without a value being set

2 files changed, 17 insertions, 0 deletions

diff --git a/pygments/lexers/configs.py b/pygments/lexers/configs.py
index 4854e59f..27d4bcb6 100644
--- a/pygments/lexers/configs.py
+++ b/pygments/lexers/configs.py
@@ -113,6 +113,7 @@ class PropertiesLexer(RegexLexer):
     tokens = {
         'root': [
             (r'^(\w+)([ \t])(\w+\s*)$', bygroups(Name.Attribute, Text, String)),
+            (r'^\w+(\\[ \t]\w*)*$', Name.Attribute),
             (r'(^ *)([#!].*)', bygroups(Text, Comment)),
             (r'(.*?)([ \t]*)([=:])([ \t]*)(.*(?:(?<=\\)\n.*)*)',
              bygroups(Name.Attribute, Text, Operator, Text, String)),
diff --git a/tests/test_properties.py b/tests/test_properties.py
index 113fcfca..333f3d7a 100644
--- a/tests/test_properties.py
+++ b/tests/test_properties.py
@@ -71,3 +71,19 @@ class PropertiesTest(unittest.TestCase):
             (Token.Literal.String, 'value\n'),
         ]
         self.assertEqual(tokens, list(self.lexer.get_tokens(fragment)))
+
+    def test_just_key(self):
+        fragment = 'justkey\n'
+        tokens = [
+            (Token.Name.Attribute, 'justkey'),
+            (Token.Text, '\n'),
+        ]
+        self.assertEqual(tokens, list(self.lexer.get_tokens(fragment)))
+
+    def test_just_key_with_space(self):
+        fragment = 'just\\ key\n'
+        tokens = [
+            (Token.Name.Attribute, 'just\\ key'),
+            (Token.Text, '\n'),
+        ]
+        self.assertEqual(tokens, list(self.lexer.get_tokens(fragment)))