81 lines
2.1 KiB
Python
81 lines
2.1 KiB
Python
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import operator
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import collections
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def freeze_dict(dict_):
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"""Freezes ``dict`` into ``tuple``.
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A typical usage is packing ``dict`` into hashable.
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e.g.::
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>>> freeze_dict({'a': 1, 'b': 2})
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(('a', 1), ('b', 2))
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"""
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pairs = dict_.items()
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key_getter = operator.itemgetter(0)
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return tuple(sorted(pairs, key=key_getter))
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def join_html_attrs(attrs):
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"""Joins the map structure into HTML attributes.
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The return value is a 2-tuple ``(template, ordered_values)``. It should be
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passed into :class:`markupsafe.Markup` to prevent XSS attacked.
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e.g.::
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>>> join_html_attrs({'href': '/', 'data-active': 'true'})
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('data-active="{0}" href="{1}"', ['true', '/'])
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"""
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attrs = collections.OrderedDict(freeze_dict(attrs or {}))
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template = ' '.join('%s="{%d}"' % (k, i) for i, k in enumerate(attrs))
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return template, list(attrs.values())
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class BoundTypeProperty(object):
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"""This kind of property creates subclasses of given class for each
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instance.
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Those subclasses means "bound type" which be used for identifying
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themselves with blinker/Flask signals.
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e.g.::
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>>> class Foo(object):
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... pass
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>>> class Bar(object):
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... Foo = BoundTypeProperty('Foo', Foo)
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>>>
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>>> Bar.Foo
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BoundTypeProperty('Foo', Foo)
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>>> bar = Bar()
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>>> bar.Foo is Foo
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False
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>>> issubclass(bar.Foo, Foo)
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True
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>>> egg = Bar()
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>>> egg.Foo is bar.Foo
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False
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>>> egg.Foo.__bases__ == bar.Foo.__bases__ == (Foo,)
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True
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:param name: the name of this property.
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:param cls: the base class of all bound classes.
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"""
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def __init__(self, name, cls):
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self.name = name
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self.cls = cls
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def __repr__(self):
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return 'BoundTypeProperty(%r, %s)' % (self.name, self.cls.__name__)
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def __get__(self, instance, owner):
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if instance is None:
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return self
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ns = vars(instance) # the instance namespace
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if self.name not in ns:
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ns[self.name] = type(self.name, (self.cls,), {})
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return ns[self.name]
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