Added FilterMessages transform (removes system messages below the verbosity threshold)

git-svn-id: http://svn.code.sf.net/p/docutils/code/trunk/docutils@1811 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

1 files changed, 23 insertions, 0 deletions

diff --git a/docutils/transforms/universal.py b/docutils/transforms/universal.py
index 4523304f2..e7d1f150c 100644
--- a/docutils/transforms/universal.py
+++ b/docutils/transforms/universal.py
@@ -111,6 +111,29 @@ class Messages(Transform):
             self.document += section
 
 
+class FilterMessages(Transform):
+
+    """
+    Remove system messages below verbosity threshold.
+    """
+
+    default_priority = 870
+
+    def apply(self):
+        visitor = SystemMessageFilterVisitor(self.document)
+        self.document.walk(visitor)
+
+
+class SystemMessageFilterVisitor(nodes.SparseNodeVisitor):
+
+    def unknown_visit(self, node):
+        pass
+
+    def visit_system_message(self, node):
+        if node['level'] < self.document.reporter['writer'].report_level:
+            node.parent.remove(node)
+
+
 class TestMessages(Transform):
 
     """