add coverageIgnore kwarg to SimpleMatcher

allows to make 'local' SM equivalent to global 'superContext.coverageIgnore'
e.g. a SM with SM.does_nothing=True appears the same as a sub-expression
of superContext.coverageIgnore if SM.coverageIgnore==True in annotated
output.

common/python/nomadcore/annotator.py

@@ -45,7 +45,9 @@ class Annotator(object):
         ignore = False
         matcher_does_nothing = False
         if match:
-            if matcher.does_nothing:
+            if matcher.coverageIgnore:
+                ignore = True
+            elif matcher.does_nothing:
                 matcher_does_nothing = True
         else:
             m2 = RE_EMPTY.match(line)

common/python/nomadcore/simple_parser.py

@@ -73,6 +73,7 @@ class SimpleMatcher(object):
                  dependencies={},
                  defLine=0,
                  defFile='',
+                 coverageIgnore=False, # mark line as ignored in coverage analysis
                  ):
         self.index = -1
         self.startReStr = startReStr
@@ -110,6 +111,13 @@ class SimpleMatcher(object):
             elif endReStr is not None and len(extractGroupNames(endReStr))>0:
                 self.does_nothing = False
 
+        self.coverageIgnore = coverageIgnore
+        if coverageIgnore and not self.does_nothing:
+            logger.warning(
+                "SimpleMatcher '%s' has an effect " +
+                "and is marked as coverageIgnore", name)
+
+        self.coverageIgnore = self.does_nothing and coverageIgnore
         caller=inspect.currentframe()
         if (defFile == '') and (defLine == 0):
             if (caller is not None) and (caller.f_back is not None):