# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1533507068 -7200
# Node ID 4bf15505bc2ea69f6a54359d2ec4cad216e5d074
# Parent  ea5b599f5155261578ecddc7788ea00297038d60
Initialise the context parameters if null. Fixed the parent page method.

diff -r ea5b599f5155 -r 4bf15505bc2e moinformat/input/common.py
--- a/moinformat/input/common.py	Mon Aug 06 00:10:09 2018 +0200
+++ b/moinformat/input/common.py	Mon Aug 06 00:11:08 2018 +0200
@@ -32,8 +32,8 @@
 
         "Initialise the input context with the optional 'parameters'."
 
-        self.parameters = parameters
-        self.encoding = parameters and parameters.get("encoding") or self.default_encoding
+        self.parameters = parameters or {}
+        self.encoding = self.parameters.get("encoding") or self.default_encoding
 
     def all(self):
 
@@ -47,7 +47,7 @@
 
         "Return the parent of 'pagename'."
 
-        return pagename.rsplit("/", 1)[0]
+        return "/" in pagename and pagename.rsplit("/", 1)[0] or None
 
     def subpages(self, pagename):
 
diff -r ea5b599f5155 -r 4bf15505bc2e moinformat/output/common.py
--- a/moinformat/output/common.py	Mon Aug 06 00:10:09 2018 +0200
+++ b/moinformat/output/common.py	Mon Aug 06 00:11:08 2018 +0200
@@ -31,8 +31,8 @@
 
         "Initialise the output context with the optional 'parameters'."
 
-        self.parameters = parameters
-        self.encoding = parameters and parameters.get("encoding") or self.default_encoding
+        self.parameters = parameters or {}
+        self.encoding = self.parameters.get("encoding") or self.default_encoding
         self.reset()
 
     def reset(self):
@@ -53,6 +53,14 @@
 
         self.output.append(self.encode(text))
 
+    # Page characteristics.
+
+    def parent(self, pagename):
+
+        "Return the parent of 'pagename'."
+
+        return "/" in pagename and pagename.rsplit("/", 1)[0] or None
+
     # Serialisation methods.
 
     def to_string(self):