66 lines
2.2 KiB
Python
66 lines
2.2 KiB
Python
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# coding=utf-8
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"""Inline constants in a python module."""
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# Copyright 2017 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import ast
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import copy
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from pasta.base import ast_utils
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from pasta.base import scope
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class InlineError(Exception):
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pass
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def inline_name(t, name):
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"""Inline a constant name into a module."""
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sc = scope.analyze(t)
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name_node = sc.names[name]
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# The name must be a Name node (not a FunctionDef, etc.)
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if not isinstance(name_node.definition, ast.Name):
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raise InlineError('%r is not a constant; it has type %r' % (
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name, type(name_node.definition)))
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assign_node = sc.parent(name_node.definition)
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if not isinstance(assign_node, ast.Assign):
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raise InlineError('%r is not declared in an assignment' % name)
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value = assign_node.value
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if not isinstance(sc.parent(assign_node), ast.Module):
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raise InlineError('%r is not a top-level name' % name)
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# If the name is written anywhere else in this module, it is not constant
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for ref in name_node.reads:
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if isinstance(getattr(ref, 'ctx', None), ast.Store):
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raise InlineError('%r is not a constant' % name)
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# Replace all reads of the name with a copy of its value
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for ref in name_node.reads:
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ast_utils.replace_child(sc.parent(ref), ref, copy.deepcopy(value))
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# Remove the assignment to this name
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if len(assign_node.targets) == 1:
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ast_utils.remove_child(sc.parent(assign_node), assign_node)
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else:
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tgt_list = [tgt for tgt in assign_node.targets
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if not (isinstance(tgt, ast.Name) and tgt.id == name)]
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assign_node.targets = tgt_list
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