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/lib64/python3.6/lib2to3/fixes/fix_import.py

"""Fixer for import statements.
If spam is being imported from the local directory, this import:
    from spam import eggs
Becomes:
    from .spam import eggs

And this import:
    import spam
Becomes:
    from . import spam
"""

# Local imports
from .. import fixer_base
from os.path import dirname, join, exists, sep
from ..fixer_util import FromImport, syms, token


def traverse_imports(names):
    """
    Walks over all the names imported in a dotted_as_names node.
    """
    pending = [names]
    while pending:
        node = pending.pop()
        if node.type == token.NAME:
            yield node.value
        elif node.type == syms.dotted_name:
            yield "".join([ch.value for ch in node.children])
        elif node.type == syms.dotted_as_name:
            pending.append(node.children[0])
        elif node.type == syms.dotted_as_names:
            pending.extend(node.children[::-2])
        else:
            raise AssertionError("unknown node type")


class FixImport(fixer_base.BaseFix):
    BM_compatible = True

    PATTERN = """
    import_from< 'from' imp=any 'import' ['('] any [')'] >
    |
    import_name< 'import' imp=any >
    """

    def start_tree(self, tree, name):
        super(FixImport, self).start_tree(tree, name)
        self.skip = "absolute_import" in tree.future_features

    def transform(self, node, results):
        if self.skip:
            return
        imp = results['imp']

        if node.type == syms.import_from:
            # Some imps are top-level (eg: 'import ham')
            # some are first level (eg: 'import ham.eggs')
            # some are third level (eg: 'import ham.eggs as spam')
            # Hence, the loop
            while not hasattr(imp, 'value'):
                imp = imp.children[0]
            if self.probably_a_local_import(imp.value):
                imp.value = "." + imp.value
                imp.changed()
        else:
            have_local = False
            have_absolute = False
            for mod_name in traverse_imports(imp):
                if self.probably_a_local_import(mod_name):
                    have_local = True
                else:
                    have_absolute = True
            if have_absolute:
                if have_local:
                    # We won't handle both sibling and absolute imports in the
                    # same statement at the moment.
                    self.warning(node, "absolute and local imports together")
                return

            new = FromImport(".", [imp])
            new.prefix = node.prefix
            return new

    def probably_a_local_import(self, imp_name):
        if imp_name.startswith("."):
            # Relative imports are certainly not local imports.
            return False
        imp_name = imp_name.split(".", 1)[0]
        base_path = dirname(self.filename)
        base_path = join(base_path, imp_name)
        # If there is no __init__.py next to the file its not in a package
        # so can't be a relative import.
        if not exists(join(dirname(base_path), "__init__.py")):
            return False
        for ext in [".py", sep, ".pyc", ".so", ".sl", ".pyd"]:
            if exists(base_path + ext):
                return True
        return False

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__pycache__ DIR	-	drwxr-xr-x	2026-02-06 23:01:23	Edit Download recursive recursive
fix_apply.py	2.37 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_asserts.py	984 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_basestring.py	320 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_buffer.py	590 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_dict.py	3.67 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_except.py	3.27 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_exec.py	979 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_execfile.py	2.00 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_exitfunc.py	2.44 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_filter.py	2.59 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_funcattrs.py	644 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_future.py	547 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_getcwdu.py	451 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_has_key.py	3.12 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_idioms.py	4.76 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_import.py	3.18 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_imports.py	5.55 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_imports2.py	289 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_input.py	708 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_intern.py	1.21 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_isinstance.py	1.57 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_itertools.py	1.51 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_itertools_imports.py	2.04 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_long.py	476 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_map.py	3.55 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_metaclass.py	8.00 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_methodattrs.py	606 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_ne.py	571 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_next.py	3.10 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_nonzero.py	591 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_numliterals.py	768 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_operator.py	3.39 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_paren.py	1.20 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_print.py	2.78 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_raise.py	2.86 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_raw_input.py	454 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_reduce.py	837 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_reload.py	1.13 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_renames.py	2.17 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_repr.py	613 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_set_literal.py	1.66 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_standarderror.py	449 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_sys_exc.py	1.01 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_throw.py	1.54 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_tuple_params.py	5.43 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_types.py	1.73 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_unicode.py	1.23 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_urllib.py	8.16 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_ws_comma.py	1.06 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_xrange.py	2.63 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_xreadlines.py	689 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
fix_zip.py	1.26 KB	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive
__init__.py	47 B	lrw-r--r--	2018-12-23 21:37:14	Edit Download recursive recursive