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# Copyright (C) 2018 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""The Caesar Shift Cipher example Fire CLI.
This module demonstrates the use of Fire without specifying a target component.
Notice how the call to Fire() in the main method doesn't indicate a component.
So, all local and global variables (including all functions defined in the
module) are made available as part of the Fire CLI.
Example usage:
cipher rot13 'Hello world!' # Uryyb jbeyq!
cipher rot13 'Uryyb jbeyq!' # Hello world!
cipher caesar-encode 1 'Hello world!' # Ifmmp xpsme!
cipher caesar-decode 1 'Ifmmp xpsme!' # Hello world!
"""
import fire
def caesar_encode(n=0, text=''):
return ''.join(
_caesar_shift_char(n, char)
for char in text
)
def caesar_decode(n=0, text=''):
return caesar_encode(-n, text)
def rot13(text):
return caesar_encode(13, text)
def _caesar_shift_char(n=0, char=' '):
if not char.isalpha():
return char
if char.isupper():
return chr((ord(char) - ord('A') + n) % 26 + ord('A'))
return chr((ord(char) - ord('a') + n) % 26 + ord('a'))
def main():
fire.Fire(name='cipher')
if __name__ == '__main__':
main()
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