[bindings] partial interfaces should not violate componentization

Source/bindings/scripts/utilities.py

Index: Source/bindings/scripts/utilities.py
diff --git a/Source/bindings/scripts/utilities.py b/Source/bindings/scripts/utilities.py
index 4d80ca7d1b3dc7df5f5e0b01676a68ec943456b6..8641c99093f2ee899f756caca5f0977c3cd1c983 100644
--- a/Source/bindings/scripts/utilities.py
+++ b/Source/bindings/scripts/utilities.py
@@ -31,10 +31,27 @@ def idl_filename_to_component(idl_filename):
     path = os.path.dirname(os.path.realpath(idl_filename))
     while path:
         dirname, basename = os.path.split(path)
+        if not basename:
+            break
         if basename.lower() in KNOWN_COMPONENTS:
             return basename.lower()
         path = dirname
-    raise 'Unknown component type for %s' % idl_filename
+    raise Exception('Unknown component type for %s' % idl_filename)
+
+
+# See whether "component" can depend on "dependency" or not:
+# Suppose that we have interface X and Y:
+# - if X is a partial interface and Y is the original interface,
+#   use is_valid_component_dependency(X, Y).
+# - if X implements Y, use is_valid_component_dependency(X, Y)
+# Suppose that X is a cpp file and Y is a header file:
+# - if X includes Y, use is_valid_component_dependency(X, Y)
+def is_valid_component_dependency(component, dependency):
+    assert component in KNOWN_COMPONENTS
+    assert dependency in KNOWN_COMPONENTS
+    if component == 'core' and dependency == 'modules':
+        return False
+    return True
 
 
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