68 lines
2.1 KiB
Python
68 lines
2.1 KiB
Python
"""Fixer for import statements.
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If spam is being imported from the local directory, this import:
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from spam import eggs
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Becomes:
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from .spam import eggs
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And this import:
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import spam
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Becomes:
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from . import spam
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"""
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# Local imports
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from .. import fixer_base
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from os.path import dirname, join, exists, pathsep
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from ..fixer_util import FromImport, syms
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class FixImport(fixer_base.BaseFix):
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PATTERN = """
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import_from< type='from' imp=any 'import' ['('] any [')'] >
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import_name< type='import' imp=any >
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"""
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def transform(self, node, results):
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imp = results['imp']
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mod_name = unicode(imp.children[0] if imp.type == syms.dotted_as_name \
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else imp)
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if mod_name.startswith('.'):
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# Already a new-style import
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return
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if not probably_a_local_import(mod_name, self.filename):
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# I guess this is a global import -- skip it!
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return
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if results['type'].value == 'from':
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# Some imps are top-level (eg: 'import ham')
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# some are first level (eg: 'import ham.eggs')
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# some are third level (eg: 'import ham.eggs as spam')
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# Hence, the loop
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while not hasattr(imp, 'value'):
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imp = imp.children[0]
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imp.value = "." + imp.value
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node.changed()
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else:
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new = FromImport('.', getattr(imp, 'content', None) or [imp])
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new.set_prefix(node.get_prefix())
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node = new
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return node
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def probably_a_local_import(imp_name, file_path):
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# Must be stripped because the right space is included by the parser
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imp_name = imp_name.split('.', 1)[0].strip()
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base_path = dirname(file_path)
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base_path = join(base_path, imp_name)
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# If there is no __init__.py next to the file its not in a package
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# so can't be a relative import.
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if not exists(join(dirname(base_path), '__init__.py')):
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return False
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for ext in ['.py', pathsep, '.pyc', '.so', '.sl', '.pyd']:
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if exists(base_path + ext):
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return True
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return False
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