Get rid of logilab.common.interface.

--HG--
branch : no-logilab-common

1 files changed, 20 insertions, 2 deletions

diff --git a/pylint/interfaces.py b/pylint/interfaces.py
index 64f5a9561..03fe1df4a 100644
--- a/pylint/interfaces.py
+++ b/pylint/interfaces.py
@@ -13,8 +13,6 @@
 """Interfaces for Pylint objects"""
 from collections import namedtuple
 
-from logilab.common.interface import Interface
-
 Confidence = namedtuple('Confidence', ['name', 'description'])
 # Warning Certainties
 HIGH = Confidence('HIGH', 'No false positive possible.')
@@ -27,6 +25,26 @@ UNDEFINED = Confidence('UNDEFINED',
 CONFIDENCE_LEVELS = [HIGH, INFERENCE, INFERENCE_FAILURE, UNDEFINED]
 
 
+class Interface(object):
+    """Base class for interfaces."""
+    def is_implemented_by(cls, instance):
+        return implements(instance, cls)
+    is_implemented_by = classmethod(is_implemented_by)
+
+
+def implements(obj, interface):
+    """Return true if the give object (maybe an instance or class) implements
+    the interface.
+    """
+    kimplements = getattr(obj, '__implements__', ())
+    if not isinstance(kimplements, (list, tuple)):
+        kimplements = (kimplements,)
+    for implementedinterface in kimplements:
+        if issubclass(implementedinterface, interface):
+            return True
+    return False
+
+
 class IChecker(Interface):
     """This is an base interface, not designed to be used elsewhere than for
     sub interfaces definition.