add support for Swift PM package references

lib/censorius.rb

@@ -42,6 +42,10 @@ def generate_paths(object, parent_path = '') # rubocop:disable Metrics/Cyclomati
         generate_paths_target_dependency(object, parent_path)
       when Xcodeproj::Project::Object::PBXReferenceProxy
         generate_paths_reference_proxy(object, parent_path)
+      when Xcodeproj::Project::Object::XCRemoteSwiftPackageReference
+        generate_paths_remote_swift_package_reference(object, parent_path)
+      when Xcodeproj::Project::Object::XCSwiftPackageProductDependency
+        generate_paths_remote_swift_package_product_dependency(object, parent_path)
       else
         raise "Unrecognized: #{object.class}, at: #{parent_path}"
       end
@@ -56,6 +60,9 @@ def generate_paths_project(project)
       project.targets.each do |target|
         generate_paths(target, path)
       end
+      project.package_references.each do |package_reference|
+        generate_paths(package_reference, path)
+      end
     end
 
     def generate_paths_configuration_list(configuration_list, parent_path)
@@ -83,6 +90,9 @@ def generate_paths_target(target, parent_path)
       target.dependencies.each do |dependency|
         generate_paths(dependency, path)
       end
+      target.package_product_dependencies.each do |dependency|
+        generate_paths(dependency, path)
+      end
     end
 
     def generate_paths_phase(phase, parent_path)
@@ -93,8 +103,15 @@ def generate_paths_phase(phase, parent_path)
     end
 
     def generate_paths_build_file(build_file, parent_path)
-      file_ref_path = generate_paths(build_file.file_ref)
-      @paths_by_object[build_file] = "#{parent_path}/PBXBuildFile(#{file_ref_path})"
+      if build_file.file_ref
+        file_ref_path = generate_paths(build_file.file_ref)
+        @paths_by_object[build_file] = "#{parent_path}/PBXBuildFile(#{file_ref_path})"
+      elsif build_file.product_ref
+        product_ref_path = generate_paths(build_file.product_ref)
+        @paths_by_object[build_file] = "#{parent_path}/PBXBuildFile(#{product_ref_path})"
+      else
+        raise "Unsupported: #{build_file}"
+      end
     end
 
     def generate_paths_build_rule(build_rule, parent_path)
@@ -144,6 +161,14 @@ def generate_paths_reference_proxy(proxy, parent_path)
       generate_paths(proxy.remote_ref, path) if proxy.remote_ref
     end
 
+    def generate_paths_remote_swift_package_reference(reference, parent_path)
+      @paths_by_object[reference] = path = "#{parent_path}/XCRemoteSwiftPackageReference(#{reference.repositoryURL}/#{reference.requirement})"
+    end
+
+    def generate_paths_remote_swift_package_product_dependency(dependency, parent_path)
+      @paths_by_object[dependency] = path = "#{parent_path}/XCSwiftPackageProductDependency(#{dependency.product_name})"
+    end
+
     def write_debug_paths
       return if @projects.empty?