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82 lines
2.5 KiB
Python
82 lines
2.5 KiB
Python
from __future__ import absolute_import, division, unicode_literals
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from types import ModuleType
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try:
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import xml.etree.cElementTree as default_etree
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except ImportError:
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import xml.etree.ElementTree as default_etree
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__all__ = ["default_etree", "MethodDispatcher", "isSurrogatePair",
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"surrogatePairToCodepoint", "moduleFactoryFactory"]
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class MethodDispatcher(dict):
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"""Dict with 2 special properties:
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On initiation, keys that are lists, sets or tuples are converted to
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multiple keys so accessing any one of the items in the original
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list-like object returns the matching value
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md = MethodDispatcher({("foo", "bar"):"baz"})
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md["foo"] == "baz"
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A default value which can be set through the default attribute.
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"""
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def __init__(self, items=()):
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# Using _dictEntries instead of directly assigning to self is about
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# twice as fast. Please do careful performance testing before changing
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# anything here.
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_dictEntries = []
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for name, value in items:
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if type(name) in (list, tuple, frozenset, set):
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for item in name:
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_dictEntries.append((item, value))
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else:
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_dictEntries.append((name, value))
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dict.__init__(self, _dictEntries)
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self.default = None
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def __getitem__(self, key):
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return dict.get(self, key, self.default)
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# Some utility functions to dal with weirdness around UCS2 vs UCS4
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# python builds
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def isSurrogatePair(data):
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return (len(data) == 2 and
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ord(data[0]) >= 0xD800 and ord(data[0]) <= 0xDBFF and
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ord(data[1]) >= 0xDC00 and ord(data[1]) <= 0xDFFF)
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def surrogatePairToCodepoint(data):
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char_val = (0x10000 + (ord(data[0]) - 0xD800) * 0x400 +
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(ord(data[1]) - 0xDC00))
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return char_val
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# Module Factory Factory (no, this isn't Java, I know)
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# Here to stop this being duplicated all over the place.
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def moduleFactoryFactory(factory):
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moduleCache = {}
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def moduleFactory(baseModule, *args, **kwargs):
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if isinstance(ModuleType.__name__, type("")):
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name = "_%s_factory" % baseModule.__name__
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else:
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name = b"_%s_factory" % baseModule.__name__
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if name in moduleCache:
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return moduleCache[name]
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else:
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mod = ModuleType(name)
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objs = factory(baseModule, *args, **kwargs)
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mod.__dict__.update(objs)
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moduleCache[name] = mod
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return mod
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return moduleFactory
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