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Edit File : _utils.py \| Size : 3.92 KB
from __future__ import absolute_import, division, unicode_literals from types import ModuleType from pip._vendor.six import text_type try: import xml.etree.cElementTree as default_etree except ImportError: import xml.etree.ElementTree as default_etree __all__ = ["default_etree", "MethodDispatcher", "isSurrogatePair", "surrogatePairToCodepoint", "moduleFactoryFactory", "supports_lone_surrogates"] # Platforms not supporting lone surrogates (\uD800-\uDFFF) should be # caught by the below test. In general this would be any platform # using UTF-16 as its encoding of unicode strings, such as # Jython. This is because UTF-16 itself is based on the use of such # surrogates, and there is no mechanism to further escape such # escapes. try: _x = eval('"\\uD800"') # pylint:disable=eval-used if not isinstance(_x, text_type): # We need this with u"" because of http://bugs.jython.org/issue2039 _x = eval('u"\\uD800"') # pylint:disable=eval-used assert isinstance(_x, text_type) except: # pylint:disable=bare-except supports_lone_surrogates = False else: supports_lone_surrogates = True class MethodDispatcher(dict): """Dict with 2 special properties: On initiation, keys that are lists, sets or tuples are converted to multiple keys so accessing any one of the items in the original list-like object returns the matching value md = MethodDispatcher({("foo", "bar"):"baz"}) md["foo"] == "baz" A default value which can be set through the default attribute. """ def __init__(self, items=()): # Using _dictEntries instead of directly assigning to self is about # twice as fast. Please do careful performance testing before changing # anything here. _dictEntries = [] for name, value in items: if isinstance(name, (list, tuple, frozenset, set)): for item in name: _dictEntries.append((item, value)) else: _dictEntries.append((name, value)) dict.__init__(self, _dictEntries) assert len(self) == len(_dictEntries) self.default = None def __getitem__(self, key): return dict.get(self, key, self.default) # Some utility functions to deal with weirdness around UCS2 vs UCS4 # python builds def isSurrogatePair(data): return (len(data) == 2 and ord(data[0]) >= 0xD800 and ord(data[0]) <= 0xDBFF and ord(data[1]) >= 0xDC00 and ord(data[1]) <= 0xDFFF) def surrogatePairToCodepoint(data): char_val = (0x10000 + (ord(data[0]) - 0xD800) * 0x400 + (ord(data[1]) - 0xDC00)) return char_val # Module Factory Factory (no, this isn't Java, I know) # Here to stop this being duplicated all over the place. def moduleFactoryFactory(factory): moduleCache = {} def moduleFactory(baseModule, args, kwargs): if isinstance(ModuleType.__name__, type("")): name = "_%s_factory" % baseModule.__name__ else: name = b"_%s_factory" % baseModule.__name__ kwargs_tuple = tuple(kwargs.items()) try: return moduleCache[name][args][kwargs_tuple] except KeyError: mod = ModuleType(name) objs = factory(baseModule, args, *kwargs) mod.__dict__.update(objs) if "name" not in moduleCache: moduleCache[name] = {} if "args" not in moduleCache[name]: moduleCache[name][args] = {} if "kwargs" not in moduleCache[name][args]: moduleCache[name][args][kwargs_tuple] = {} moduleCache[name][args][kwargs_tuple] = mod return mod return moduleFactory def memoize(func): cache = {} def wrapped(args, *kwargs): key = (tuple(args), tuple(kwargs.items())) if key not in cache: cache[key] = func(args, **kwargs) return cache[key] return wrapped Back

Edit File : _utils.py | Size : 3.92 KB

from __future__ import absolute_import, division, unicode_literals

from types import ModuleType

from pip._vendor.six import text_type

try:
    import xml.etree.cElementTree as default_etree
except ImportError:
    import xml.etree.ElementTree as default_etree

__all__ = ["default_etree", "MethodDispatcher", "isSurrogatePair",
           "surrogatePairToCodepoint", "moduleFactoryFactory",
           "supports_lone_surrogates"]

# Platforms not supporting lone surrogates (\uD800-\uDFFF) should be
# caught by the below test. In general this would be any platform
# using UTF-16 as its encoding of unicode strings, such as
# Jython. This is because UTF-16 itself is based on the use of such
# surrogates, and there is no mechanism to further escape such
# escapes.
try:
    _x = eval('"\\uD800"')  # pylint:disable=eval-used
    if not isinstance(_x, text_type):
        # We need this with u"" because of http://bugs.jython.org/issue2039
        _x = eval('u"\\uD800"')  # pylint:disable=eval-used
        assert isinstance(_x, text_type)
except:  # pylint:disable=bare-except
    supports_lone_surrogates = False
else:
    supports_lone_surrogates = True

class MethodDispatcher(dict):
    """Dict with 2 special properties:

On initiation, keys that are lists, sets or tuples are converted to
    multiple keys so accessing any one of the items in the original
    list-like object returns the matching value

md = MethodDispatcher({("foo", "bar"):"baz"})
    md["foo"] == "baz"

A default value which can be set through the default attribute.
    """

def __init__(self, items=()):
        # Using _dictEntries instead of directly assigning to self is about
        # twice as fast. Please do careful performance testing before changing
        # anything here.
        _dictEntries = []
        for name, value in items:
            if isinstance(name, (list, tuple, frozenset, set)):
                for item in name:
                    _dictEntries.append((item, value))
            else:
                _dictEntries.append((name, value))
        dict.__init__(self, _dictEntries)
        assert len(self) == len(_dictEntries)
        self.default = None

def __getitem__(self, key):
        return dict.get(self, key, self.default)

# Some utility functions to deal with weirdness around UCS2 vs UCS4
# python builds

def isSurrogatePair(data):
    return (len(data) == 2 and
            ord(data[0]) >= 0xD800 and ord(data[0]) <= 0xDBFF and
            ord(data[1]) >= 0xDC00 and ord(data[1]) <= 0xDFFF)

def surrogatePairToCodepoint(data):
    char_val = (0x10000 + (ord(data[0]) - 0xD800) * 0x400 +
                (ord(data[1]) - 0xDC00))
    return char_val

# Module Factory Factory (no, this isn't Java, I know)
# Here to stop this being duplicated all over the place.

def moduleFactoryFactory(factory):
    moduleCache = {}

def moduleFactory(baseModule, *args, **kwargs):
        if isinstance(ModuleType.__name__, type("")):
            name = "_%s_factory" % baseModule.__name__
        else:
            name = b"_%s_factory" % baseModule.__name__

kwargs_tuple = tuple(kwargs.items())

try:
            return moduleCache[name][args][kwargs_tuple]
        except KeyError:
            mod = ModuleType(name)
            objs = factory(baseModule, *args, **kwargs)
            mod.__dict__.update(objs)
            if "name" not in moduleCache:
                moduleCache[name] = {}
            if "args" not in moduleCache[name]:
                moduleCache[name][args] = {}
            if "kwargs" not in moduleCache[name][args]:
                moduleCache[name][args][kwargs_tuple] = {}
            moduleCache[name][args][kwargs_tuple] = mod
            return mod

return moduleFactory

def memoize(func):
    cache = {}

def wrapped(*args, **kwargs):
        key = (tuple(args), tuple(kwargs.items()))
        if key not in cache:
            cache[key] = func(*args, **kwargs)
        return cache[key]

return wrapped

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