60 lines
2.2 KiB
Python
60 lines
2.2 KiB
Python
"""Updates all source files to import the same set of __future__ directives.
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"""
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from lib2to3 import fixer_base
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from lib2to3 import pytree
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from lib2to3.pgen2 import token
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from lib2to3.fixer_util import FromImport, Name, Comma, Newline
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# copied from fix_tuple_params.py
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def is_docstring(stmt):
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return isinstance(stmt, pytree.Node) and \
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stmt.children[0].type == token.STRING
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class FixFutureImports(fixer_base.BaseFix):
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BM_compatible = True
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PATTERN = """import_from< 'from' module_name="__future__" 'import' any >"""
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def start_tree(self, tree, filename):
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self.found_future_import = False
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def new_future_import(self, old):
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new = FromImport("__future__",
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[Name("absolute_import", prefix=" "), Comma(),
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Name("division", prefix=" "), Comma(),
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Name("print_function", prefix=" "), Comma(),
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Name("with_statement", prefix=" ")])
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if old is not None:
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new.prefix = old.prefix
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return new
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def transform(self, node, results):
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self.found_future_import = True
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return self.new_future_import(node)
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def finish_tree(self, tree, filename):
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if self.found_future_import:
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return
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if not isinstance(tree, pytree.Node):
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# Empty files (usually __init__.py) show up as a single Leaf
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# instead of a Node, so leave them alone
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return
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first_stmt = tree.children[0]
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if is_docstring(first_stmt):
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# Skip a line and add the import after the docstring
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tree.insert_child(1, Newline())
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pos = 2
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elif first_stmt.prefix:
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# No docstring, but an initial comment (perhaps a #! line).
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# Transfer the initial comment to a new blank line.
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newline = Newline()
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newline.prefix = first_stmt.prefix
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first_stmt.prefix = ""
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tree.insert_child(0, newline)
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pos = 1
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else:
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# No comments or docstring, just insert at the start
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pos = 0
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tree.insert_child(pos, self.new_future_import(None))
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tree.insert_child(pos+1, Newline()) # terminates the import stmt
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