"""Fix incompatible imports and module references."""

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# Authors: Collin Winter, Nick Edds

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# Local imports

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from .. import fixer_base

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from ..fixer_util import Name, attr_chain

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MAPPING = {'StringIO': 'io',

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'cStringIO': 'io',

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'cPickle': 'pickle',

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'__builtin__' : 'builtins',

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'copy_reg': 'copyreg',

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'Queue': 'queue',

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'SocketServer': 'socketserver',

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'ConfigParser': 'configparser',

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'repr': 'reprlib',

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'FileDialog': 'tkinter.filedialog',

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'tkFileDialog': 'tkinter.filedialog',

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'SimpleDialog': 'tkinter.simpledialog',

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'tkSimpleDialog': 'tkinter.simpledialog',

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'tkColorChooser': 'tkinter.colorchooser',

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'tkCommonDialog': 'tkinter.commondialog',

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'Dialog': 'tkinter.dialog',

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'Tkdnd': 'tkinter.dnd',

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'tkFont': 'tkinter.font',

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'tkMessageBox': 'tkinter.messagebox',

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'ScrolledText': 'tkinter.scrolledtext',

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'Tkconstants': 'tkinter.constants',

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'Tix': 'tkinter.tix',

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'ttk': 'tkinter.ttk',

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'Tkinter': 'tkinter',

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'markupbase': '_markupbase',

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'_winreg': 'winreg',

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'thread': '_thread',

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'dummy_thread': '_dummy_thread',

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# anydbm and whichdb are handled by fix_imports2

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'dbhash': 'dbm.bsd',

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'dumbdbm': 'dbm.dumb',

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'dbm': 'dbm.ndbm',

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'gdbm': 'dbm.gnu',

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'xmlrpclib': 'xmlrpc.client',

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'DocXMLRPCServer': 'xmlrpc.server',

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'SimpleXMLRPCServer': 'xmlrpc.server',

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'httplib': 'http.client',

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'htmlentitydefs' : 'html.entities',

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'HTMLParser' : 'html.parser',

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'Cookie': 'http.cookies',

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'cookielib': 'http.cookiejar',

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'BaseHTTPServer': 'http.server',

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'SimpleHTTPServer': 'http.server',

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'CGIHTTPServer': 'http.server',

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#'test.test_support': 'test.support',

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'commands': 'subprocess',

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'UserString' : 'collections',

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'UserList' : 'collections',

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'urlparse' : 'urllib.parse',

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'robotparser' : 'urllib.robotparser',

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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(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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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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# 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 FixImports(fixer_base.BaseFix):

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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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