appypod-rattail/__init__.py

'''Appy allows you to create easily complete applications in Python.'''

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import os.path

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def getPath(): return os.path.dirname(__file__)
def versionIsGreaterThanOrEquals(version):
    '''This method returns True if the current Appy version is greater than or
       equals p_version. p_version must have a format like "0.5.0".'''
    import appy.version
    if appy.version.short == 'dev':
        # We suppose that a developer knows what he is doing, so we return True.
        return True
    else:
        paramVersion = [int(i) for i in version.split('.')]
        currentVersion = [int(i) for i in appy.version.short.split('.')]
        return currentVersion >= paramVersion

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class Object:
    '''At every place we need an object, but without any requirement on its
       class (methods, attributes,...) we will use this minimalist class.'''
    def __init__(self, **fields):
        for k, v in fields.iteritems():
            setattr(self, k, v)
    def __repr__(self):
        res = u'<Object '
        for attrName, attrValue in self.__dict__.iteritems():
            v = attrValue
            if hasattr(v, '__repr__'):
                v = v.__repr__()
            try:
                res += u'%s=%s ' % (attrName, v)
            except UnicodeDecodeError:
                res += u'%s=<encoding problem> ' % attrName
        res  = res.strip() + '>'
        return res.encode('utf-8')
    def __nonzero__(self):
        return bool(self.__dict__)
    def get(self, name, default=None): return getattr(self, name, default)
    def update(self, other):
        '''Includes information from p_other into p_self.'''
        for k, v in other.__dict__.iteritems():
            setattr(self, k, v)

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class Hack:
    '''This class proposes methods for patching some existing code with
       alternative methods.'''
    @staticmethod
    def patch(method, replacement):
        '''This method replaces m_method with a p_replacement method, but
           keeps p_method on its class under name
           "_base_<initial_method_name>_". In the patched method, one may use
           Hack.base to call the base method.'''
        # Get the class on which the surgery will take place.
        klass = method.im_class
        # On this class, store m_method under its "base" name.
        name = method.im_func.__name__
        baseName = '_base_%s_' % name
        setattr(klass, baseName, method)
        # Store the replacement method on klass.
        setattr(klass, name, replacement)

    @staticmethod
    def base(method):
        return getattr(method.im_class, '_base_%s_' % method.im_func.__name__)
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