#!/usr/bin/python

import re


def Boundary(object):

    class Plus:
        pass

    class Minus:
        pass

    def __init__(self, which, what):
        sign = None
        offset = 0
        parts = re.match('', which)
        if '+' in which:
            offset_phrase = which.split('+')


class RangeBoundary(object):

    def __init__(self, phrase):
        self.phrase = phrase


class Range(object):

    def __init__(self, start, end):
        self.start = start
        self.end = end