[BugFix] fixed a bug that deco_name can't be parsed corrected (#46297)

* use re replace judge by case

* simplify re

python/paddle/fluid/dygraph/dygraph_to_static/decorator_transformer.py

@@ -22,6 +22,7 @@ from paddle.fluid.dygraph.dygraph_to_static.utils import create_funcDef_node, as
 import warnings
 
 import re
+from paddle.fluid.dygraph.dygraph_to_static.utils import RE_PYNAME, RE_PYMODULE
 
 IGNORE_NAMES = [
     'declarative', 'to_static', 'dygraph_to_static_func', 'wraps',
@@ -65,17 +66,23 @@ class DecoratorTransformer(BaseTransformer):
 
         for deco in reversed(deco_list):
             # skip INGNORE_NAMES
-            if isinstance(deco, gast.Attribute):
-                deco_name = deco.attr
-            elif isinstance(deco, gast.Call):
-                if hasattr(deco.func, 'args'):
-                    deco_name = deco.func.args[0].id
-                elif hasattr(deco.func, 'attr'):
-                    deco_name = deco.func.attr
-                else:
-                    deco_name = deco.func.id
+            deco_full_name = ast_to_source_code(deco).strip()
+            if isinstance(deco, gast.Call):
+                # match case like :
+                # 1: @_jst.Call(a.b.c.d.deco)()
+                # 2: @q.w.e.r.deco()
+                re_tmp = re.match(
+                    r'({module})*({name}\(){{0,1}}({module})*({name})(\)){{0,1}}\(.*$'
+                    .format(name=RE_PYNAME, module=RE_PYMODULE), deco_full_name)
+                deco_name = re_tmp.group(4)
             else:
-                deco_name = deco.id
+                # match case like:
+                # @a.d.g.deco
+                re_tmp = re.match(
+                    r'({module})*({name})$'.format(name=RE_PYNAME,
+                                                   module=RE_PYMODULE),
+                    deco_full_name)
+                deco_name = re_tmp.group(2)
             if deco_name in IGNORE_NAMES:
                 continue
             elif deco_name == 'contextmanager':
@@ -83,7 +90,6 @@ class DecoratorTransformer(BaseTransformer):
                     "Dy2Static : A context manager decorator is used, this may not work correctly after transform."
                 )
 
-            deco_full_name = ast_to_source_code(deco).strip()
             decoed_func = '_decoedby_' + deco_name
 
             # get function after decoration

python/paddle/fluid/dygraph/dygraph_to_static/utils.py

@@ -93,6 +93,9 @@ FOR_ITER_VAR_LEN_PREFIX = '__for_loop_var_len'
 FOR_ITER_VAR_NAME_PREFIX = '__for_loop_iter_var'
 FOR_ITER_ZIP_TO_LIST_PREFIX = '__for_loop_iter_zip'
 
+RE_PYNAME = '[a-zA-Z0-9_]+'
+RE_PYMODULE = '[a-zA-Z0-9_]+\.'
+
 # FullArgSpec is valid from Python3. Defined a Namedtuple to
 # to make it available in Python2.
 FullArgSpec = collections.namedtuple('FullArgSpec', [