# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1354665500 -3600
# Node ID 55e021cabb0bb8946f7f98511910d10d42eea12d
# Parent  0065b36bc983b65ec5782c7283f51146121367b2
Added support for conditional regions that require the absence of a field.

diff -r 0065b36bc983 -r 55e021cabb0b MoinForms.py
--- a/MoinForms.py	Mon Dec 03 01:47:09 2012 +0100
+++ b/MoinForms.py	Wed Dec 05 00:58:20 2012 +0100
@@ -228,6 +228,8 @@
                 getFormStructure(body, request, path and ("%s/%s" % (path, section_name)) or section_name, section)
             elif attributes.has_key("message"):
                 getFormStructure(body, request, path, structure)
+            elif attributes.has_key("not-message"):
+                getFormStructure(body, request, path, structure)
 
         # Get field details from other kinds of region.
 
@@ -305,6 +307,7 @@
         elif format == "form":
             section_name = attributes.get("section")
             message_name = attributes.get("message")
+            absent_message_name = attributes.get("not-message")
 
             # Sections are groups of fields in their own namespace.
 
@@ -326,6 +329,12 @@
             elif message_name and section.has_key(message_name):
                 output.append(getFormOutput(body, section, path))
 
+            # Not-message regions are conditional on a particular field being
+            # absent. They reference the current namespace.
+
+            elif absent_message_name and not section.has_key(absent_message_name):
+                output.append(getFormOutput(body, section, path))
+
         # Inspect and include other regions.
 
         else: