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utils.py
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82 lines (66 loc) · 2.57 KB
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from __future__ import absolute_import
from types import ModuleType
class MethodDispatcher(dict):
u"""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
__init__.func_annotations = {}
def __getitem__(self, key):
return dict.get(self, key, self.default)
__getitem__.func_annotations = {}
#Some utility functions to dal with weirdness around UCS2 vs UCS4
#python builds
def encodingType():
if len() == 2:
return u"UCS2"
else:
return u"UCS4"
encodingType.func_annotations = {}
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)
isSurrogatePair.func_annotations = {}
def surrogatePairToCodepoint(data):
char_val = (0x10000 + (ord(data[0]) - 0xD800) * 0x400 +
(ord(data[1]) - 0xDC00))
return char_val
surrogatePairToCodepoint.func_annotations = {}
# 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 type(ModuleType.__name__) is unicode:
name = u"_%s_factory" % baseModule.__name__
else:
name = "_%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
moduleFactory.func_annotations = {}
return moduleFactory
moduleFactoryFactory.func_annotations = {}