92 lines
3.1 KiB
Python
92 lines
3.1 KiB
Python
"""
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Fixer for import statements, with a __future__ import line.
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Based on lib2to3/fixes/fix_import.py, but extended slightly so it also
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supports Cython modules.
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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 __future__ import absolute_import
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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 __future__ import absolute_import
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from . import spam
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"""
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from os.path import dirname, join, exists, sep
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from lib2to3.fixes.fix_import import FixImport
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from lib2to3.fixer_util import FromImport, syms
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from lib2to3.fixes.fix_import import traverse_imports
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from libfuturize.fixer_util import future_import
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class FixAbsoluteImport(FixImport):
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run_order = 9
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def transform(self, node, results):
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"""
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Copied from FixImport.transform(), but with this line added in
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any modules that had implicit relative imports changed:
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from __future__ import absolute_import"
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"""
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if self.skip:
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return
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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 = u"." + imp.value
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imp.changed()
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future_import(u"absolute_import", node)
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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(u".", [imp])
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new.prefix = node.prefix
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future_import(u"absolute_import", node)
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return new
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def probably_a_local_import(self, imp_name):
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"""
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Like the corresponding method in the base class, but this also
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supports Cython modules.
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"""
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if imp_name.startswith(u"."):
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# Relative imports are certainly not local imports.
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return False
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imp_name = imp_name.split(u".", 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", ".pyx"]:
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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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