100 lines
3.3 KiB
Python
100 lines
3.3 KiB
Python
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"""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("unknown node type")
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class FixImport(fixer_base.BaseFix):
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BM_compatible = True
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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 start_tree(self, tree, name):
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super(FixImport, self).start_tree(tree, name)
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self.skip = "absolute_import" in tree.future_features
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def transform(self, node, results):
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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 = "." + 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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if imp_name.startswith("."):
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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(".", 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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