ptype.py

def ptype(regex):
    """Searches a given regex parameterized query into a dict
    >>> @search('(?P<letter>[A-Z])?')
    ... def getletter(string):
    ...     return string['letter']
    ...
    >>> getletter('ABC')
    ('A', 'BC')
    >>> getletter('0BC')
    (None, '0BC')
    """
    def decorator(parse_func):
        """Returns the search decorator"""

        def func_wrapper(tail):
            """Returns the decorated search wrapper"""
            match = re.search('^' + regex, tail.strip(), re.I | re.X)
            if match is None:
                return None, tail
                
            # item = parse_func(match.groupdict())
            item = match.groupdict()['type']
            
            if item is not None:
                tail = tail.strip()[match.end():]
            return item, tail

        return func_wrapper
return decorator