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