mirror of
https://github.com/python/cpython.git
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b1f7b7bef5
svn+ssh://pythondev@svn.python.org/python/trunk
................
r77898 | martin.v.loewis | 2010-02-01 02:15:39 +0100 (Mo, 01 Feb 2010) | 17 lines
Merged revisions 77855-77856,77870 via svnmerge from
svn+ssh://pythondev@svn.python.org/sandbox/trunk/2to3/lib2to3
........
r77855 | benjamin.peterson | 2010-01-30 17:32:05 +0100 (Sa, 30 Jan 2010) | 1 line
don't return node if it is not changed
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r77856 | benjamin.peterson | 2010-01-30 17:35:29 +0100 (Sa, 30 Jan 2010) | 1 line
return None to indicate no change
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r77870 | benjamin.peterson | 2010-01-31 02:21:26 +0100 (So, 31 Jan 2010) | 1 line
never return the original node given to transform()
........
................
89 lines
2.8 KiB
Python
89 lines
2.8 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, sep
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from ..fixer_util import FromImport, syms, token
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def traverse_imports(names):
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"""
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Walks over all the names imported in a dotted_as_names node.
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"""
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pending = [names]
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while pending:
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node = pending.pop()
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if node.type == token.NAME:
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yield node.value
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elif node.type == syms.dotted_name:
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yield "".join([ch.value for ch in node.children])
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elif node.type == syms.dotted_as_name:
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pending.append(node.children[0])
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elif node.type == syms.dotted_as_names:
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pending.extend(node.children[::-2])
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else:
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raise AssertionError("unkown node type")
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class FixImport(fixer_base.BaseFix):
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PATTERN = """
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import_from< 'from' imp=any 'import' ['('] any [')'] >
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import_name< '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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if node.type == syms.import_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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if self.probably_a_local_import(imp.value):
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imp.value = "." + imp.value
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imp.changed()
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else:
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have_local = False
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have_absolute = False
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for mod_name in traverse_imports(imp):
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if self.probably_a_local_import(mod_name):
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have_local = True
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else:
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have_absolute = True
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if have_absolute:
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if have_local:
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# We won't handle both sibling and absolute imports in the
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# same statement at the moment.
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self.warning(node, "absolute and local imports together")
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return
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new = FromImport('.', [imp])
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new.prefix = node.prefix
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return new
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def probably_a_local_import(self, imp_name):
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imp_name = imp_name.split('.', 1)[0]
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base_path = dirname(self.filename)
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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', sep, '.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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