Your friends and you have decided to feel like the true hackers and create a special "hacker language" for correspondence in the net. The original messages will be written in English and then encrypted according to these rules:
- all letters and whitespaces will be converted into their ASCII codes and than into the binary numbers. Except the whitespaces - their binary form should be '1000000' not '100000'.
- numbers, dates (in the 'dd.mm.yyyy' format), time (in the 'hh:mm' format) and special signs ('.', ':', '!', '?', '@', '$', '%') won't be converted.
For the realisation of this system you should create the HackerLanguage class with the following methods:
write(text) - adds new (text) to the current text message.
delete(N) - deletes from the current text message the last N symbols.
send() - returns the encrypted message which will be send.
read(text) - gets the encrypted (text) as the argument and returns the normal readable English text.
In this mission you could use the Interpreter design pattern.
message_1 = HackerLanguage() message_1.write('Remember: 21.07.2018 at 11:11AM') message_1.delete(2) message_1.write('PM') message_1.send() == '10100101100101110110111001011101101110001011001011110010:100000021.07.2018100000011000011110100100000011:1110100001001101' message_2 = HackerLanguage() message_2.read('email@example.com') == 'My email is firstname.lastname@example.org'
Input: Plain or encrypted text.
Output: Encrypted or decrypted text of the message.
How it is used: For the encryption and decryption of the important information.
Precondition: Only [a-z], [A-Z], [0-9], ".", ":", "!", "?", "$", "%", "@" in the text.