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103 lines
3.8 KiB
103 lines
3.8 KiB
5 years ago
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"""Fix UserDict.
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Incomplete!
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TODO: base this on fix_urllib perhaps?
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"""
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# Local imports
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from lib2to3 import fixer_base
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from lib2to3.fixer_util import Name, attr_chain
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from lib2to3.fixes.fix_imports import alternates, build_pattern, FixImports
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MAPPING = {'UserDict': 'collections',
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}
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# def alternates(members):
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# return "(" + "|".join(map(repr, members)) + ")"
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#
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#
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# def build_pattern(mapping=MAPPING):
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# mod_list = ' | '.join(["module_name='%s'" % key for key in mapping])
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# bare_names = alternates(mapping.keys())
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#
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# yield """name_import=import_name< 'import' ((%s) |
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# multiple_imports=dotted_as_names< any* (%s) any* >) >
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# """ % (mod_list, mod_list)
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# yield """import_from< 'from' (%s) 'import' ['(']
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# ( any | import_as_name< any 'as' any > |
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# import_as_names< any* >) [')'] >
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# """ % mod_list
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# yield """import_name< 'import' (dotted_as_name< (%s) 'as' any > |
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# multiple_imports=dotted_as_names<
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# any* dotted_as_name< (%s) 'as' any > any* >) >
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# """ % (mod_list, mod_list)
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#
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# # Find usages of module members in code e.g. thread.foo(bar)
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# yield "power< bare_with_attr=(%s) trailer<'.' any > any* >" % bare_names
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# class FixUserDict(fixer_base.BaseFix):
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class FixUserdict(FixImports):
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BM_compatible = True
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keep_line_order = True
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# This is overridden in fix_imports2.
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mapping = MAPPING
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# We want to run this fixer late, so fix_import doesn't try to make stdlib
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# renames into relative imports.
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run_order = 6
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def build_pattern(self):
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return "|".join(build_pattern(self.mapping))
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def compile_pattern(self):
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# We override this, so MAPPING can be pragmatically altered and the
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# changes will be reflected in PATTERN.
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self.PATTERN = self.build_pattern()
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super(FixImports, self).compile_pattern()
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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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# Module usage could be in the trailer of an attribute lookup, so we
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# might have nested matches when "bare_with_attr" is present.
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if "bare_with_attr" not in results and \
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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_name")
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if import_mod:
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mod_name = import_mod.value
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new_name = unicode(self.mapping[mod_name])
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import_mod.replace(Name(new_name, prefix=import_mod.prefix))
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if "name_import" in results:
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# If it's not a "from x import x, y" or "import x as y" import,
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# marked its usage to be replaced.
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self.replace[mod_name] = new_name
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if "multiple_imports" in results:
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# This is a nasty hack to fix multiple imports on a line (e.g.,
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# "import StringIO, urlparse"). The problem is that I can't
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# figure out an easy way to make a pattern recognize the keys of
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# MAPPING randomly sprinkled in an import statement.
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results = self.match(node)
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if results:
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self.transform(node, results)
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else:
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# Replace usage of the module.
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bare_name = results["bare_with_attr"][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.prefix))
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