1 files changed, 59 insertions, 0 deletions
diff --git a/tensorflow/python/autograph/pyct/parser.py b/tensorflow/python/autograph/pyct/parser.py
new file mode 100644
index 0000000000..112ed46a1e
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+++ b/tensorflow/python/autograph/pyct/parser.py
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+# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ==============================================================================
+"""Converting code to AST.
+
+Adapted from Tangent.
+"""
+
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import textwrap
+
+import gast
+
+from tensorflow.python.util import tf_inspect
+
+
+def parse_entity(entity):
+  """Returns the AST of given entity."""
+  source = tf_inspect.getsource(entity)
+  source = textwrap.dedent(source)
+  return parse_str(source), source
+
+
+def parse_str(src):
+  """Returns the AST of given piece of code."""
+  # TODO(mdan): This should exclude the module things are autowrapped in.
+  return gast.parse(src)
+
+
+def parse_expression(src):
+  """Returns the AST of given identifier.
+
+  Args:
+    src: A piece of code that represents a single Python expression
+  Returns:
+    A gast.AST object.
+  Raises:
+    ValueError: if src does not consist of a single Expression.
+  """
+  node = parse_str(src)
+  assert isinstance(node, gast.Module)
+  if len(node.body) != 1 and not isinstance(node.body[0], gast.Expr):
+    raise ValueError(
+        'Expected a single expression, found instead %s' % node.body)
+  return node.body[0].value