mirror of https://github.com/python/cpython
90 lines
3.0 KiB
Python
90 lines
3.0 KiB
Python
"""Fix incompatible imports and module references.
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Fixes:
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* StringIO -> io
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* cStringIO -> io
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* md5 -> hashlib
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"""
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# Author: Collin Winter
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# Local imports
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from . import basefix
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from .util import Name, attr_chain, any, set
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import builtins
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builtin_names = [name for name in dir(builtins)
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if name not in ("__name__", "__doc__")]
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MAPPING = {"StringIO": ("io", ["StringIO"]),
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"cStringIO": ("io", ["StringIO"]),
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"__builtin__" : ("builtins", builtin_names),
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}
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def alternates(members):
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return "(" + "|".join(map(repr, members)) + ")"
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def build_pattern():
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bare = set()
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for old_module, (new_module, members) in list(MAPPING.items()):
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bare.add(old_module)
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bare.update(members)
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members = alternates(members)
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yield """import_name< 'import' (module=%r
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| dotted_as_names< any* module=%r any* >) >
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""" % (old_module, old_module)
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yield """import_from< 'from' module_name=%r 'import'
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( %s | import_as_name< %s 'as' any >) >
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""" % (old_module, members, members)
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yield """import_from< 'from' module_name=%r 'import' star='*' >
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""" % old_module
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yield """import_name< 'import'
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dotted_as_name< module_name=%r 'as' any > >
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""" % old_module
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yield """power< module_name=%r trailer< '.' %s > any* >
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""" % (old_module, members)
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yield """bare_name=%s""" % alternates(bare)
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class FixImports(basefix.BaseFix):
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PATTERN = "|".join(build_pattern())
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order = "pre" # Pre-order tree traversal
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# Don't match the node if it's within another match
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def match(self, node):
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match = super(FixImports, self).match
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results = match(node)
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if results:
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if any([match(obj) for obj in attr_chain(node, "parent")]):
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return False
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return results
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return False
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def start_tree(self, tree, filename):
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super(FixImports, self).start_tree(tree, filename)
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self.replace = {}
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def transform(self, node, results):
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import_mod = results.get("module")
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mod_name = results.get("module_name")
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bare_name = results.get("bare_name")
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star = results.get("star")
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if import_mod or mod_name:
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new_name, members = MAPPING[(import_mod or mod_name).value]
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if import_mod:
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self.replace[import_mod.value] = new_name
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import_mod.replace(Name(new_name, prefix=import_mod.get_prefix()))
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elif mod_name:
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if star:
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self.cannot_convert(node, "Cannot handle star imports.")
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else:
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mod_name.replace(Name(new_name, prefix=mod_name.get_prefix()))
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elif bare_name:
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bare_name = bare_name[0]
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new_name = self.replace.get(bare_name.value)
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if new_name:
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bare_name.replace(Name(new_name, prefix=bare_name.get_prefix()))
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