metrics: add metric about abstract class inheritance

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>

diff --git a/src/metrics/inheritance_metrics.nit b/src/metrics/inheritance_metrics.nit
index b00a40b..a9a4a6d 100644 (file)
--- a/src/metrics/inheritance_metrics.nit
+++ b/src/metrics/inheritance_metrics.nit
@@ -355,6 +355,29 @@ class CNODC
        end
 end
 
+# MClass metric: Number of Abstract Class Ancestors
+#
+# Count only absrtract classes
+class CNOAA
+       super MClassMetric
+       super IntMetric
+       redef fun name do return "cnoaa"
+       redef fun desc do return "number of abstract class ancestors"
+
+       redef fun collect(mclasses) do
+               for mclass in mclasses do
+                       var count = 0
+                       for parent in mclass.in_hierarchy(mainmodule).greaters do
+                               if parent == mclass then continue
+                               if parent.kind == abstract_kind then
+                                       count += 1
+                               end
+                       end
+                       values[mclass] = count
+               end
+       end
+end
+
 # MClass metric: Number of Interface Ancestors
 #
 # Count only interfaces