pypattern.py

import inspect

class MetaVar(object):
	def __init__(self, name):
		self.name = name
		self.value = None
	
	def __repr__(self):
		return '_.%r' % self.name

class Meta(object):
	def __getattr__(self, name):
		return MetaVar(name)
	
	def __call__(self, _obj=None, **kwargs):
		assert (_obj != None or len(kwargs) > 0) and not (_obj != None and len(kwargs) > 0)
		if _obj == None:
			_obj = kwargs
		
		return Pattern(_obj)

_ = Meta()

class Pattern(object):
	def __init__(self, obj):
		self.metavars = {}
		self.pattern = obj
		self.getVars(self.pattern)
	
	def getVars(self, pattern):
		if isinstance(pattern, MetaVar):
			self.metavars[pattern.name] = pattern
			return
		
		if isinstance(pattern, dict):
			for elem in pattern.values():
				self.getVars(elem)
		else:
			for elem in pattern:
				self.getVars(elem)
	
	def match(self, obj):
		
		
		frame = inspect.stack()[1][0]
		for name, mvar in self.metavars.items():
			frame.f_locals[name] = name

__all__= '_',