Reorg and document

bigraph_schema/__init__.py

@@ -1,2 +1,6 @@
-from bigraph_schema.registry import deep_merge, validate_merge, default, Registry, hierarchy_depth, is_schema_key, strip_schema_keys, type_parameter_key, non_schema_keys
-from bigraph_schema.type_system import TypeSystem, Edge, get_path, establish_path, set_path, transform_path, visit_method
+from bigraph_schema.registry import (
+    deep_merge, validate_merge, default, Registry, hierarchy_depth, is_schema_key, establish_path,
+    strip_schema_keys, type_parameter_key, non_schema_keys, set_path, transform_path)
+from bigraph_schema.utilities import get_path, visit_method
+from bigraph_schema.edge import Edge
+from bigraph_schema.type_system import TypeSystem

bigraph_schema/edge.py

@@ -0,0 +1,26 @@
+"""
+====
+Edge
+====
+
+Base class for all edges in the bigraph schema.
+"""
+
+class Edge:
+    def __init__(self):
+        pass
+
+
+    def inputs(self):
+        return {}
+
+
+    def outputs(self):
+        return {}
+
+
+    def interface(self):
+        """Returns the schema for this type"""
+        return {
+            'inputs': self.inputs(),
+            'outputs': self.outputs()}

bigraph_schema/registry.py

@@ -17,31 +17,6 @@
 from bigraph_schema.protocols import local_lookup_module, function_module
 
 
-NONE_SYMBOL = '!nil'
-
-
-required_schema_keys = set([
-    '_default',
-    '_apply',
-    '_check',
-    '_serialize',
-    '_deserialize',
-    '_fold',
-])
-
-
-optional_schema_keys = set([
-    '_type',
-    '_value',
-    '_description',
-    '_type_parameters',
-    '_inherit',
-    '_divide',
-])
-
-
-type_schema_keys = required_schema_keys | optional_schema_keys
-
 
 def deep_merge_copy(dct, merge_dct):
     return deep_merge(copy.deepcopy(dct), merge_dct)