Let PipeLine support copy()

hanlp/components/pipeline.py

@@ -145,15 +145,21 @@ def __call__(self, doc: Union[Document, Any] = None, **kwargs) -> Document:
         for component in self:
             doc = component(doc)
         return doc
-
+
+    def copy(self):
+        return self.__copy__()
+
+    def __copy__(self):
+        config = self.meta
+        return Pipeline.from_config(config)
+
     @property
     def meta(self):
         return {
             'classpath': classpath_of(self),
             'hanlp_version': hanlp.version.__version__,
             'pipes': [pipe.config for pipe in self]
-        }
-
+        }    
     @meta.setter
     def meta(self, value):
         pass

tests/test_pipeline.py

@@ -0,0 +1,15 @@
+import unittest
+import hanlp
+
+
+class TestPipeLine(unittest.TestCase):
+    def test_copy(self):
+        pipe = hanlp.pipeline().append(hanlp.utils.rules.split_sentence)
+        copied_pipe = pipe.copy()
+        test_text = "今天天气真好。我要去散步。"
+        assert pipe is not copied_pipe
+        copied_pipe.append(lambda sent: "".join(sent))
+        assert pipe(test_text) != copied_pipe(test_text)
+
+if __name__ == '__main__':
+    unittest.main()