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python34
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utils.py
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from __future__ import absolute_import, division, unicode_literals from types import ModuleType try: import xml.etree.cElementTree as default_etree except ImportError: import xml.etree.ElementTree as default_etree __all__ = ["default_etree", "MethodDispatcher", "isSurrogatePair", "surrogatePairToCodepoint", "moduleFactoryFactory"] 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 type(name) in (list, tuple, frozenset, set): for item in name: _dictEntries.append((item, value)) else: _dictEntries.append((name, value)) dict.__init__(self, _dictEntries) self.default = None def __getitem__(self, key): return dict.get(self, key, self.default) # Some utility functions to dal 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__ if name in moduleCache: return moduleCache[name] else: mod = ModuleType(name) objs = factory(baseModule, *args, **kwargs) mod.__dict__.update(objs) moduleCache[name] = mod return mod return moduleFactory