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Viewing File: fix_imports.py
u"""
Fixer for standard library imports renamed in Python 3
"""
from lib2to3 import fixer_base
from lib2to3.fixer_util import Name, is_probably_builtin, Newline, does_tree_import
from lib2to3.pygram import python_symbols as syms
from lib2to3.pgen2 import token
from lib2to3.pytree import Node, Leaf
from libfuturize.fixer_util import touch_import_top
# from ..fixer_util import NameImport
# used in simple_mapping_to_pattern()
MAPPING = {u"reprlib": u"repr",
u"winreg": u"_winreg",
u"configparser": u"ConfigParser",
u"copyreg": u"copy_reg",
u"queue": u"Queue",
u"socketserver": u"SocketServer",
u"_markupbase": u"markupbase",
u"test.support": u"test.test_support",
u"dbm.bsd": u"dbhash",
u"dbm.ndbm": u"dbm",
u"dbm.dumb": u"dumbdbm",
u"dbm.gnu": u"gdbm",
u"html.parser": u"HTMLParser",
u"html.entities": u"htmlentitydefs",
u"http.client": u"httplib",
u"http.cookies": u"Cookie",
u"http.cookiejar": u"cookielib",
# "tkinter": "Tkinter",
u"tkinter.dialog": u"Dialog",
u"tkinter._fix": u"FixTk",
u"tkinter.scrolledtext": u"ScrolledText",
u"tkinter.tix": u"Tix",
u"tkinter.constants": u"Tkconstants",
u"tkinter.dnd": u"Tkdnd",
u"tkinter.__init__": u"Tkinter",
u"tkinter.colorchooser": u"tkColorChooser",
u"tkinter.commondialog": u"tkCommonDialog",
u"tkinter.font": u"tkFont",
u"tkinter.ttk": u"ttk",
u"tkinter.messagebox": u"tkMessageBox",
u"tkinter.turtle": u"turtle",
u"urllib.robotparser": u"robotparser",
u"xmlrpc.client": u"xmlrpclib",
u"builtins": u"__builtin__",
}
# generic strings to help build patterns
# these variables mean (with http.client.HTTPConnection as an example):
# name = http
# attr = client
# used = HTTPConnection
# fmt_name is a formatted subpattern (simple_name_match or dotted_name_match)
# helps match 'queue', as in 'from queue import ...'
simple_name_match = u"name='%s'"
# helps match 'client', to be used if client has been imported from http
subname_match = u"attr='%s'"
# helps match 'http.client', as in 'import urllib.request'
dotted_name_match = u"dotted_name=dotted_name< %s '.' %s >"
# helps match 'queue', as in 'queue.Queue(...)'
power_onename_match = u"%s"
# helps match 'http.client', as in 'http.client.HTTPConnection(...)'
power_twoname_match = u"power< %s trailer< '.' %s > any* >"
# helps match 'client.HTTPConnection', if 'client' has been imported from http
power_subname_match = u"power< %s any* >"
# helps match 'from http.client import HTTPConnection'
from_import_match = u"from_import=import_from< 'from' %s 'import' imported=any >"
# helps match 'from http import client'
from_import_submod_match = u"from_import_submod=import_from< 'from' %s 'import' (%s | import_as_name< %s 'as' renamed=any > | import_as_names< any* (%s | import_as_name< %s 'as' renamed=any >) any* > ) >"
# helps match 'import urllib.request'
name_import_match = u"name_import=import_name< 'import' %s > | name_import=import_name< 'import' dotted_as_name< %s 'as' renamed=any > >"
# helps match 'import http.client, winreg'
multiple_name_import_match = u"name_import=import_name< 'import' dotted_as_names< names=any* > >"
def all_patterns(name):
u"""
Accepts a string and returns a pattern of possible patterns involving that name
Called by simple_mapping_to_pattern for each name in the mapping it receives.
"""
# i_ denotes an import-like node
# u_ denotes a node that appears to be a usage of the name
if u'.' in name:
name, attr = name.split(u'.', 1)
simple_name = simple_name_match % (name)
simple_attr = subname_match % (attr)
dotted_name = dotted_name_match % (simple_name, simple_attr)
i_from = from_import_match % (dotted_name)
i_from_submod = from_import_submod_match % (simple_name, simple_attr, simple_attr, simple_attr, simple_attr)
i_name = name_import_match % (dotted_name, dotted_name)
u_name = power_twoname_match % (simple_name, simple_attr)
u_subname = power_subname_match % (simple_attr)
return u' | \n'.join((i_name, i_from, i_from_submod, u_name, u_subname))
else:
simple_name = simple_name_match % (name)
i_name = name_import_match % (simple_name, simple_name)
i_from = from_import_match % (simple_name)
u_name = power_onename_match % (simple_name)
return u' | \n'.join((i_name, i_from, u_name))
class FixImports(fixer_base.BaseFix):
PATTERN = u' | \n'.join([all_patterns(name) for name in MAPPING])
PATTERN = u' | \n'.join((PATTERN, multiple_name_import_match))
def transform(self, node, results):
touch_import_top(u'future', u'standard_library', node)
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