Viewing file:  fix_UserDict.py (3.75 KB) -rw-r--r--
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"""Fix UserDict.
Incomplete!
TODO: base this on fix_urllib perhaps?
"""
# Local imports
from lib2to3 import fixer_base
from lib2to3.fixer_util import Name, attr_chain
from lib2to3.fixes.fix_imports import alternates, build_pattern, FixImports
MAPPING = {'UserDict': 'collections',
}
# def alternates(members):
# return "(" + "|".join(map(repr, members)) + ")"
#
#
# def build_pattern(mapping=MAPPING):
# mod_list = ' | '.join(["module_name='%s'" % key for key in mapping])
# bare_names = alternates(mapping.keys())
#
# yield """name_import=import_name< 'import' ((%s) |
# multiple_imports=dotted_as_names< any* (%s) any* >) >
# """ % (mod_list, mod_list)
# yield """import_from< 'from' (%s) 'import' ['(']
# ( any | import_as_name< any 'as' any > |
# import_as_names< any* >) [')'] >
# """ % mod_list
# yield """import_name< 'import' (dotted_as_name< (%s) 'as' any > |
# multiple_imports=dotted_as_names<
# any* dotted_as_name< (%s) 'as' any > any* >) >
# """ % (mod_list, mod_list)
#
# # Find usages of module members in code e.g. thread.foo(bar)
# yield "power< bare_with_attr=(%s) trailer<'.' any > any* >" % bare_names
# class FixUserDict(fixer_base.BaseFix):
class FixUserdict(FixImports):
BM_compatible = True
keep_line_order = True
# This is overridden in fix_imports2.
mapping = MAPPING
# We want to run this fixer late, so fix_import doesn't try to make stdlib
# renames into relative imports.
run_order = 6
def build_pattern(self):
return "|".join(build_pattern(self.mapping))
def compile_pattern(self):
# We override this, so MAPPING can be pragmatically altered and the
# changes will be reflected in PATTERN.
self.PATTERN = self.build_pattern()
super(FixImports, self).compile_pattern()
# Don't match the node if it's within another match.
def match(self, node):
match = super(FixImports, self).match
results = match(node)
if results:
# Module usage could be in the trailer of an attribute lookup, so we
# might have nested matches when "bare_with_attr" is present.
if "bare_with_attr" not in results and \
any(match(obj) for obj in attr_chain(node, "parent")):
return False
return results
return False
def start_tree(self, tree, filename):
super(FixImports, self).start_tree(tree, filename)
self.replace = {}
def transform(self, node, results):
import_mod = results.get("module_name")
if import_mod:
mod_name = import_mod.value
new_name = unicode(self.mapping[mod_name])
import_mod.replace(Name(new_name, prefix=import_mod.prefix))
if "name_import" in results:
# If it's not a "from x import x, y" or "import x as y" import,
# marked its usage to be replaced.
self.replace[mod_name] = new_name
if "multiple_imports" in results:
# This is a nasty hack to fix multiple imports on a line (e.g.,
# "import StringIO, urlparse"). The problem is that I can't
# figure out an easy way to make a pattern recognize the keys of
# MAPPING randomly sprinkled in an import statement.
results = self.match(node)
if results:
self.transform(node, results)
else:
# Replace usage of the module.
bare_name = results["bare_with_attr"][0]
new_name = self.replace.get(bare_name.value)
if new_name:
bare_name.replace(Name(new_name, prefix=bare_name.prefix))
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