Allow value negation with ! for KVPairs

1 files changed, 7 insertions, 0 deletions

diff --git a/confparse.py b/confparse.py
index a5cecf2..0885299 100644
--- a/confparse.py
+++ b/confparse.py
@@ -466,6 +466,8 @@ class KVPair(ParseTreeNode):
     """
     A key value pair, specified in the form:
         key: value
+    or:
+        key: ! value
     """
     def __init__(self, toks):
         """
@@ -476,12 +478,17 @@ class KVPair(ParseTreeNode):
         if not toks[0].isword():
             raise ParseError("Expected name before %s token" % toks[0])
         self.name = toks[0]
+        self.truth = True
         del toks[0]
         toks.assert_full()
         if not toks[0].isoper(":"):
             raise ParseError("Expected `:` before %s token" % toks[0])
         del toks[0]
         toks.trim_leading_whitespace()
+        if toks[0].isoper("!"):
+            self.truth = False
+            del toks[0]
+            toks.trim_leading_whitespace()
         if not toks[0].isword():
             raise ParseError("Expected value before %s token" % toks[0])
         self.value = toks[0]