Refactoring loading of external special phrases and importation process by introducing SPLoader and SPWikiLoader

nominatim/tools/special_phrases/sp_loader.py

@@ -0,0 +1,16 @@
+"""
+    Module containing the SPLoader class.
+"""
+from abc import ABC, abstractmethod
+
+class SPLoader(ABC):
+    """
+        Base class for special phrases loaders.
+        Handle the loading of special phrases from external sources.
+    """
+    def __iter__(self):
+        return self
+
+    @abstractmethod
+    def __next__(self):
+        pass