New IFCPatch recipe to optimise IFCs by recycling non rooted elements

src/ifcpatch/recipes/RecycleNonRootedElements.py

@@ -0,0 +1,20 @@
+class Patcher:
+    def __init__(self, src, file, logger, args=None):
+        self.src = src
+        self.file = file
+        self.logger = logger
+        self.args = args
+
+    def patch(self):
+        import ifcopenshell.util.element
+        hashes = {}
+        for element in self.file:
+            if element.is_a('IfcRoot'):
+                continue
+            h = hash(tuple(element))
+            if h in hashes:
+                for inverse in f.get_inverse(element):
+                    ifcopenshell.util.element.replace_attribute(inverse, element, hashes[h])
+                self.file.remove(element)
+            else:
+                hashes[h] = element