Move ReferenceResolver out of parser.py

Pure refactor, no behavior changes.

PiperOrigin-RevId: 419644893

Author: MarkDaoust

tools/tensorflow_docs/api_generator/generate_lib.py

@@ -31,6 +31,7 @@
 from tensorflow_docs.api_generator import parser
 from tensorflow_docs.api_generator import pretty_docs
 from tensorflow_docs.api_generator import public_api
+from tensorflow_docs.api_generator import reference_resolver as reference_resolver_lib
 from tensorflow_docs.api_generator import signature
 from tensorflow_docs.api_generator import traverse
 from tensorflow_docs.api_generator.report import utils
@@ -804,7 +805,7 @@ def __init__(
     self._extra_docs = extra_docs
 
   def make_reference_resolver(self, visitor):
-    return parser.ReferenceResolver.from_visitor(
+    return reference_resolver_lib.ReferenceResolver.from_visitor(
         visitor, py_module_names=[self._short_name])
 
   def make_parser_config(self, visitor, reference_resolver):

tools/tensorflow_docs/api_generator/generate_lib_test.py

@@ -28,6 +28,7 @@
 from tensorflow_docs.api_generator import doc_controls
 from tensorflow_docs.api_generator import generate_lib
 from tensorflow_docs.api_generator import parser
+from tensorflow_docs.api_generator import reference_resolver as reference_resolver_lib
 
 import yaml
 
@@ -115,7 +116,7 @@ def get_test_objects(self):
 
     visitor = DummyVisitor(index, duplicate_of)
 
-    reference_resolver = parser.ReferenceResolver.from_visitor(
+    reference_resolver = reference_resolver_lib.ReferenceResolver.from_visitor(
         visitor=visitor, py_module_names=['tf'], link_prefix='api_docs/python')
 
     parser_config = config.ParserConfig(