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#!/usr/bin/env python

"""

Reference: https://en.wikipedia.org/wiki/Decorator_pattern

"""

class TextTag(object):

"""Represents a base text tag"""

def __init__(self, text):

self._text = text

def render(self):

return self._text

class BoldWrapper(object):

"""Wraps a tag in <b>"""

def __init__(self, wrapped):

self._wrapped = wrapped

def render(self):

return "<b>{}</b>".format(self._wrapped.render())

class ItalicWrapper(object):

"""Wraps a tag in <i>"""

def __init__(self, wrapped):

self._wrapped = wrapped

def render(self):

return "<i>{}</i>".format(self._wrapped.render())

if __name__ == '__main__':

simple_hello = TextTag("hello, world!")

special_hello = ItalicWrapper(BoldWrapper(simple_hello))

print("before:", simple_hello.render())

print("after:", special_hello.render())

### OUTPUT ###

# before: hello, world!

# after: <i><b>hello, world!</b></i>