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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
from tensorflow.python.autograph.pyct import origin_info
def ast_to_source(node, indentation=' '):
"""Return the source code of given AST.
Args:
node: The code to compile, as an AST object.
indentation: The string to use for indentation.
Returns:
code: The source code generated from the AST object
source_mapping: A mapping between the user and AutoGraph generated code.
"""
if not isinstance(node, (list, tuple)):
node = (node,)
generator = astor.codegen.SourceGenerator(indentation, False,
astor.string_repr.pretty_string)
for n in node:
if isinstance(n, gast.AST):
n = gast.gast_to_ast(n)
generator.visit(n)
generator.result.append('\n')
# In some versions of Python, literals may appear as actual values. This
# ensures everything is string.
code = ''.join(map(str, generator.result))
# Strip leading blank lines.
code_lines = code.split('\n')
trimmed_code_lines = []
for l in code_lines:
if l.rstrip() or trimmed_code_lines:
trimmed_code_lines.append(l)
code = '\n'.join(trimmed_code_lines)
return code
def ast_to_object(nodes,
indentation=' ',
include_source_map=False,
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:
nodes: Union[ast.AST, Iterable[ast.AST]], the code to compile, as an AST
object.
indentation: Text, the string to use for indentation.
include_source_map: bool, whether to attach a source map to the compiled
object. Also see origin_info.py.
source_prefix: Optional[Text], string to print as-is into the source file.
delete_on_exit: bool, whether to delete the temporary file used for
compilation on exit.
Returns:
compiled_nodes: A module object containing the compiled source code.
source: The source code of the compiled object
Raises:
ValueError: If ag_source_map__ is already in the namespace of the compiled
nodes.
"""
if not isinstance(nodes, (list, tuple)):
nodes = (nodes,)
source = ast_to_source(nodes, indentation=indentation)
if source_prefix:
source = source_prefix + '\n' + source
with tempfile.NamedTemporaryFile(mode='w', suffix='.py', delete=False) as f:
module_name = os.path.basename(f.name[:-3])
f.write(source)
if isinstance(nodes, (list, tuple)):
indices = range(-len(nodes), 0)
else:
indices = (-1,)
if include_source_map:
source_map = origin_info.create_source_map(nodes, source, f.name, indices)
# TODO(mdan): Try flush() and delete=False instead.
if delete_on_exit:
atexit.register(lambda: os.remove(f.name))
compiled_nodes = imp.load_source(module_name, f.name)
# TODO(znado): Clean this up so we don't need to attach it to the namespace.
# TODO(znado): This does not work for classes because their methods share a
# namespace.
# This attaches the source map which is needed for error handling. Note that
# api.to_graph copies this source map into an attribute of the function.
#
# We need this so the ag_source_map__ variable is available to the call to
# rewrite_graph_construction_error in the except block inside each function
# that handles graph construction errors.
#
# We cannot get the rewritten function name until it is too late so templating
# is hard, and this cleanly fixes the
# issues encountered with nested functions because this is attached to the
# outermost one.
if include_source_map:
# TODO(mdan): This name should be decided by the caller.
source_map_name = 'ag_source_map__'
if source_map_name in compiled_nodes.__dict__:
raise ValueError('cannot convert %s because is has namespace attribute '
'"%s", which is reserved for AutoGraph.' %
(compiled_nodes, source_map_name))
compiled_nodes.__dict__[source_map_name] = source_map
return compiled_nodes, source
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