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program_utils.py
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62 lines (50 loc) · 1.58 KB
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# Copyright (C) 2021 Google Inc.
#
# 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.
"""Program utility functions."""
import inspect
import textwrap
import uuid
import gast as ast
import six
def getsource(obj):
"""Gets the source for the given object.
Args:
obj: A module, class, method, function, traceback, frame, or code object.
Returns:
The source of the object, if available.
"""
if inspect.ismethod(obj):
func = obj.__func__
else:
func = obj
source = inspect.getsource(func)
return textwrap.dedent(source)
def program_to_ast(program):
"""Convert a program to its AST.
Args:
program: Either an AST node, source string, or a function.
Returns:
The root AST node of the AST representing the program.
"""
if isinstance(program, ast.AST):
return program
if isinstance(program, six.string_types):
source = program
else:
source = getsource(program)
module_node = ast.parse(source, mode='exec')
return module_node
def unique_id():
"""Returns a unique id that is suitable for identifying graph nodes."""
return uuid.uuid4().int & ((1 << 64) - 1)