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PODecorator dynamic superclassing
 

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    <p>I have simple decorators for replacing invalid characters in dict values when they are attempted to be retrieved.</p> <pre><code>import types class ContentInterface(dict): def __getitem__(self, item): raise NotImplementedError class Content(ContentInterface): def __getitem__(self, item): return dict.__getitem__(self, item) class DictDecorator(ContentInterface): def __init__(self, interfaceContent, **config): super(DictDecorator, self).__init__() self._component = interfaceContent self._config = config def _replace(self, text): return text def _check(self, invalidCharacterSet, itemPath): pass def __getitem__(self, name): item = self._component[name] if isinstance(item, types.StringTypes): newText = self._replace(item) invalidCharacterSet = set([char for char in item if char not in newText]) self._check(invalidCharacterSet, name) return newText else: return self.__class__(item, **self._config) class ReplaceCommaDecorator(DictDecorator): def _replace(self, text): return text.replace(",", ' ') class ReplaceDotDecorator(DictDecorator): def _replace(self, text): return text.replace('.', ' ') class ReplaceColonDecorator(DictDecorator): def _replace(self, text): return text.replace(":", ' ') class ReplaceSemicolonDecorator(DictDecorator): def _replace(self, text): return text.replace(";", ' ') </code></pre> <p>I want to use this the following way:</p> <pre><code>dictWithReplacedCharacters =\ ReplaceCommaDecorator( # Empty ReplaceDotDecorator( # Empty ReplaceColonDecorator( # Empty ReplaceSemicolonDecorator( # Empty Content({ # Data '1':u'1A:B;C,D.E', '2':{ '21':u'21A:B;C,D.E', '22':u'22A:B;C,D.E', } }), ), ), ), ) print dictWithReplacedCharacters['2']['21'] </code></pre> <p>I've got 4 redundant dict objects represented decorators for one data dict. </p> <p>I want to force the nested statement above to return ReplaceCommaDecorator object inherited from ReplaceDotDecorator inherited from ReplaceColonDecorator inherited from ReplaceSemicolonDecorator inherited from Content containing data. I guess this can be solved in DictDecorator's __new__ method.</p>
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