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fix_urllib.py
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"""Fix changes imports of urllib which are now incompatible. This is rather similar to fix_imports, but because of the more complex nature of the fixing for urllib, it has its own fixer. """ # Author: Nick Edds # Local imports from lib2to3.fixes.fix_imports import alternates, FixImports from lib2to3.fixer_util import (Name, Comma, FromImport, Newline, find_indentation, Node, syms) MAPPING = {"urllib": [ ("urllib.request", ["URLopener", "FancyURLopener", "urlretrieve", "_urlopener", "urlopen", "urlcleanup", "pathname2url", "url2pathname"]), ("urllib.parse", ["quote", "quote_plus", "unquote", "unquote_plus", "urlencode", "splitattr", "splithost", "splitnport", "splitpasswd", "splitport", "splitquery", "splittag", "splittype", "splituser", "splitvalue", ]), ("urllib.error", ["ContentTooShortError"])], "urllib2" : [ ("urllib.request", ["urlopen", "install_opener", "build_opener", "Request", "OpenerDirector", "BaseHandler", "HTTPDefaultErrorHandler", "HTTPRedirectHandler", "HTTPCookieProcessor", "ProxyHandler", "HTTPPasswordMgr", "HTTPPasswordMgrWithDefaultRealm", "AbstractBasicAuthHandler", "HTTPBasicAuthHandler", "ProxyBasicAuthHandler", "AbstractDigestAuthHandler", "HTTPDigestAuthHandler", "ProxyDigestAuthHandler", "HTTPHandler", "HTTPSHandler", "FileHandler", "FTPHandler", "CacheFTPHandler", "UnknownHandler"]), ("urllib.error", ["URLError", "HTTPError"]), ] } # Duplicate the url parsing functions for urllib2. MAPPING["urllib2"].append(MAPPING["urllib"][1]) def build_pattern(): bare = set() for old_module, changes in MAPPING.items(): for change in changes: new_module, members = change members = alternates(members) yield """import_name< 'import' (module=%r | dotted_as_names< any* module=%r any* >) > """ % (old_module, old_module) yield """import_from< 'from' mod_member=%r 'import' ( member=%s | import_as_name< member=%s 'as' any > | import_as_names< members=any* >) > """ % (old_module, members, members) yield """import_from< 'from' module_star=%r 'import' star='*' > """ % old_module yield """import_name< 'import' dotted_as_name< module_as=%r 'as' any > > """ % old_module # bare_with_attr has a special significance for FixImports.match(). yield """power< bare_with_attr=%r trailer< '.' member=%s > any* > """ % (old_module, members) class FixUrllib(FixImports): def build_pattern(self): return "|".join(build_pattern()) def transform_import(self, node, results): """Transform for the basic import case. Replaces the old import name with a comma separated list of its replacements. """ import_mod = results.get("module") pref = import_mod.prefix names = [] # create a Node list of the replacement modules for name in MAPPING[import_mod.value][:-1]: names.extend([Name(name[0], prefix=pref), Comma()]) names.append(Name(MAPPING[import_mod.value][-1][0], prefix=pref)) import_mod.replace(names) def transform_member(self, node, results): """Transform for imports of specific module elements. Replaces the module to be imported from with the appropriate new module. """ mod_member = results.get("mod_member") pref = mod_member.prefix member = results.get("member") # Simple case with only a single member being imported if member: # this may be a list of length one, or just a node if isinstance(member, list): member = member[0] new_name = None for change in MAPPING[mod_member.value]: if member.value in change[1]: new_name = change[0] break if new_name: mod_member.replace(Name(new_name, prefix=pref)) else: self.cannot_convert(node, "This is an invalid module element") # Multiple members being imported else: # a dictionary for replacements, order matters modules = [] mod_dict = {} members = results["members"] for member in members: # we only care about the actual members if member.type == syms.import_as_name: as_name = member.children[2].value member_name = member.children[0].value else: member_name = member.value as_name = None if member_name != ",": for change in MAPPING[mod_member.value]: if member_name in change[1]: if change[0] not in mod_dict: modules.append(change[0]) mod_dict.setdefault(change[0], []).append(member) new_nodes = [] indentation = find_indentation(node) first = True def handle_name(name, prefix): if name.type == syms.import_as_name: kids = [Name(name.children[0].value, prefix=prefix), name.children[1].clone(), name.children[2].clone()] return [Node(syms.import_as_name, kids)] return [Name(name.value, prefix=prefix)] for module in modules: elts = mod_dict[module] names = [] for elt in elts[:-1]: names.extend(handle_name(elt, pref)) names.append(Comma()) names.extend(handle_name(elts[-1], pref)) new = FromImport(module, names) if not first or node.parent.prefix.endswith(indentation): new.prefix = indentation new_nodes.append(new) first = False if new_nodes: nodes = [] for new_node in new_nodes[:-1]: nodes.extend([new_node, Newline()]) nodes.append(new_nodes[-1]) node.replace(nodes) else: self.cannot_convert(node, "All module elements are invalid") def transform_dot(self, node, results): """Transform for calls to module members in code.""" module_dot = results.get("bare_with_attr") member = results.get("member") new_name = None if isinstance(member, list): member = member[0] for change in MAPPING[module_dot.value]: if member.value in change[1]: new_name = change[0] break if new_name: module_dot.replace(Name(new_name, prefix=module_dot.prefix)) else: self.cannot_convert(node, "This is an invalid module element") def transform(self, node, results): if results.get("module"): self.transform_import(node, results) elif results.get("mod_member"): self.transform_member(node, results) elif results.get("bare_with_attr"): self.transform_dot(node, results) # Renaming and star imports are not supported for these modules. elif results.get("module_star"): self.cannot_convert(node, "Cannot handle star imports.") elif results.get("module_as"): self.cannot_convert(node, "This module is now multiple modules")