Move to_ruby_indexer_location to class method

lib/ruby_indexer/lib/ruby_indexer/rbs_indexer.rb

@@ -5,6 +5,20 @@ module RubyIndexer
   class RBSIndexer
     extend T::Sig
 
+    class << self
+      extend T::Sig
+
+      sig { params(rbs_location: RBS::Location).returns(RubyIndexer::Location) }
+      def to_ruby_indexer_location(rbs_location)
+        RubyIndexer::Location.new(
+          rbs_location.start_line,
+          rbs_location.end_line,
+          rbs_location.start_column,
+          rbs_location.end_column,
+        )
+      end
+    end
+
     sig { params(index: Index).void }
     def initialize(index)
       @index = index
@@ -43,21 +57,11 @@ def process_declaration(declaration, pathname)
     def handle_class_declaration(declaration, pathname)
       nesting = [declaration.name.name.to_s]
       file_path = pathname.to_s
-      location = to_ruby_indexer_location(declaration.location)
+      location = self.class.to_ruby_indexer_location(declaration.location)
       comments = Array(declaration.comment&.string)
       parent_class = declaration.super_class&.name&.name&.to_s
       class_entry = Entry::Class.new(nesting, file_path, location, comments, parent_class)
       @index << class_entry
     end
-
-    sig { params(rbs_location: RBS::Location).returns(RubyIndexer::Location) }
-    def to_ruby_indexer_location(rbs_location)
-      RubyIndexer::Location.new(
-        rbs_location.start_line,
-        rbs_location.end_line,
-        rbs_location.start_column,
-        rbs_location.end_column,
-      )
-    end
   end
 end