Python

More about decorators

'''Expand abbreviations in a sentence i.e lol -> Laughing out Loud'''

class AbbvExpander:
  def __init__(self, mapping): # <-- Decorator argument received
    self.mapping = mapping

  def __call__(self, fn): # <-- __call__ received function argument
    def wrapper(*args): # <-- function arguments received in arg

      string, *_ = args

      # Replace abbreviations with full forms in string
      for abb, full_form in self.mapping.items():
        string = string.replace(abb, full_form)

      # call the funtion
      return fn(string)

    return wrapper


abbv = {
  "ttyl": "Talk to you later",
  "omg": "Oh my God!",
  "gtg": "got to go"
}

@AbbvExpander(abbv) # <-- abbv passed to decorator as argument
def display(sentence):
  print(sentence) # <-- modified sentence is printed

display("omg that's so funny. Anyways I gtg. ttyl okay.")