mercurial/templateutil.py

--- a/mercurial/templateutil.py	Wed Mar 21 12:06:18 2018 +0900
+++ b/mercurial/templateutil.py	Mon Mar 19 00:23:20 2018 +0900
@@ -38,6 +38,13 @@
     __metaclass__ = abc.ABCMeta
 
     @abc.abstractmethod
+    def contains(self, context, mapping, item):
+        """Test if the specified item is in self
+
+        The item argument may be a wrapped object.
+        """
+
+    @abc.abstractmethod
     def getmember(self, context, mapping, key):
         """Return a member item for the specified key
 
@@ -91,6 +98,10 @@
     def __init__(self, value):
         self._value = value
 
+    def contains(self, context, mapping, item):
+        item = stringify(context, mapping, item)
+        return item in self._value
+
     def getmember(self, context, mapping, key):
         raise error.ParseError(_('%r is not a dictionary')
                                % pycompat.bytestr(self._value))
@@ -125,6 +136,9 @@
     def __init__(self, value):
         self._value = value
 
+    def contains(self, context, mapping, item):
+        raise error.ParseError(_("%r is not iterable") % self._value)
+
     def getmember(self, context, mapping, key):
         raise error.ParseError(_('%r is not a dictionary') % self._value)
 
@@ -171,6 +185,10 @@
         self._joinfmt = joinfmt
         self.keytype = keytype  # hint for 'x in y' where type(x) is unresolved
 
+    def contains(self, context, mapping, item):
+        item = unwrapastype(context, mapping, item, self.keytype)
+        return item in self._values
+
     def getmember(self, context, mapping, key):
         # TODO: maybe split hybrid list/dict types?
         if not util.safehasattr(self._values, 'get'):
@@ -255,6 +273,10 @@
     def tomap(self):
         return self._makemap(self._key)
 
+    def contains(self, context, mapping, item):
+        w = makewrapped(context, mapping, self._value)
+        return w.contains(context, mapping, item)
+
     def getmember(self, context, mapping, key):
         w = makewrapped(context, mapping, self._value)
         return w.getmember(context, mapping, key)
@@ -302,6 +324,9 @@
         self._tmpl = tmpl
         self._defaultsep = sep
 
+    def contains(self, context, mapping, item):
+        raise error.ParseError(_('not comparable'))
+
     def getmember(self, context, mapping, key):
         raise error.ParseError(_('not a dictionary'))
 
@@ -371,6 +396,10 @@
         self._make = make
         self._args = args
 
+    def contains(self, context, mapping, item):
+        item = stringify(context, mapping, item)
+        return item in self.tovalue(context, mapping)
+
     def _gen(self, context):
         return self._make(context, *self._args)