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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 AST to code.
Adapted from Tangent.
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
# TODO(mdan): Use six for compatibility here.
import atexit
import imp
import os
import tempfile
import astor
import gast
def ast_to_source(node, indentation=' '):
"""Return the source code of given AST."""
if isinstance(node, gast.AST):
node = gast.gast_to_ast(node)
generator = astor.codegen.SourceGenerator(indentation, False,
astor.string_repr.pretty_string)
generator.visit(node)
generator.result.append('\n')
# In some versions of Python, literals may appear as actual values. This
# ensures everything is string.
code = map(str, generator.result)
return astor.source_repr.pretty_source(code).lstrip()
def ast_to_object(
node, indentation=' ', source_prefix=None, delete_on_exit=True):
"""Return the Python objects represented by given AST.
Compiling the AST code this way ensures that the source code is readable by
e.g. `pdb` or `inspect`.
Args:
node: The code to compile, as an AST object.
indentation: The string to use for indentation.
source_prefix: Optional string to print as-is into the source file.
delete_on_exit: Whether to delete the temporary file used for compilation
on exit.
Returns:
A module object containing the compiled source code.
"""
source = ast_to_source(node, indentation)
with tempfile.NamedTemporaryFile(mode='w', suffix='.py', delete=False) as f:
module_name = os.path.basename(f.name[:-3])
if source_prefix:
f.write(source_prefix)
f.write('\n')
f.write(source)
if delete_on_exit:
atexit.register(lambda: os.remove(f.name))
return imp.load_source(module_name, f.name), source
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