/
codegen.py
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/
codegen.py
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# Copyright 2022 The PyGlove Authors
#
# 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.
"""Utilities for code generation."""
from typing import Any, Dict, List, Optional
from pyglove.core.object_utils.missing import MISSING_VALUE
def make_function(
name: str,
args: List[str],
body: List[str],
*,
exec_globals: Optional[Dict[str, Any]] = None,
exec_locals: Optional[Dict[str, Any]] = None,
return_type: Any = MISSING_VALUE):
"""Creates a function dynamically from source."""
if exec_locals is None:
exec_locals = {}
if return_type != MISSING_VALUE:
exec_locals['_return_type'] = return_type
return_annotation = '->_return_type'
else:
return_annotation = ''
args = ', '.join(args)
body = '\n'.join(f' {line}' for line in body)
fn_def = f' def {name}({args}){return_annotation}:\n{body}'
local_vars = ', '.join(exec_locals.keys())
fn_def = f'def _make_fn({local_vars}):\n{fn_def}\n return {name}'
ns = {}
exec(fn_def, exec_globals, ns) # pylint: disable=exec-used
return ns['_make_fn'](**exec_locals)