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#!/usr/bin/env python3
#
# Morse.py - A morse code interpreter.
#
# A friend of mine likes to send me messages in Morse code
# sometimes. He's a little weird. He thinks I'm really good at Morse
# code. Actually, I can just do some Python.
#
# Author: Ben Sima <bensima@gmail.com>
# Date: 2015-07-06
# License: MIT
#
import re
import argparse
from typing import Dict
eng = {
"a" : ".-",
"b" : "-...",
"c" : "-.-.",
"d" : "-..",
"e" : ".",
"f" : "..-.",
"g" : "--.",
"h" : "....",
"i" : "..",
"j" : ".---",
"k" : "-.-",
"l" : ".-..",
"m" : "--",
"n" : "-.",
"o" : "---",
"p" : ".--.",
"q" : "--.-",
"r" : ".-.",
"s" : "...",
"t" : "-",
"u" : "..-",
"v" : "...-",
"w" : ".--",
"x" : "-..-",
"y" : "-.--",
"z" : "--..",
" " : "/",
"0" : "-----",
"1" : ".----",
"2" : "..---",
"3" : "...--",
"4" : "....-",
"5" : ".....",
"6" : "-....",
"7" : "--...",
"8" : "---..",
"9" : "----.",
"," : ",",
"!" : "!",
"?" : "?",
} # type: Dict[str, str]
morse = {v: k for k, v in eng.items()} # type: Dict[str, str]
class InvalidMorseLetter(Exception):
"Handle errors when processing Morse Code."
pass
class InvalidEnglishLetter(Exception):
"Handle errors when processing English."
pass
def morsep(msg: str) -> bool:
"Predicate for detecting Morse Code."
return msg[0][0] in ['.', '-', '/']
def morse_to_eng(msg: str) -> str:
"""Translate Morse code to English.
Will raise an InvalidMorseLetter if an error during
the translation occurs."""
split_msg = re.split(" ", msg) # type: list
filtered_msg = [e for e in split_msg if e] # type: list
try:
return ''.join("{}".format(morse[char]) for char in filtered_msg)
except KeyError:
raise InvalidMorseLetter
def eng_to_morse(msg: str) -> str:
"""Translate English into Morse Code.
Will rais an InvalidEnglishLetter if an error during
the translation occurs."""
try:
return ''.join("{} ".format(eng[char]) for char in msg)
except KeyError:
raise InvalidEnglishLetter
def decode(msg: str) -> str:
"Main control flow."
lower_msg = msg.lower()
if morsep(lower_msg) == True:
return morse_to_eng(lower_msg)
else:
return eng_to_morse(lower_msg)
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Translate English to Morse code, and vice versa.')
parser.add_argument('-v', '--version', help='Show the version.', action='version',
version='Morse 0.1')
parser.add_argument('msg', type=str, nargs=1,
help="""The message to be decoded.
Input type will be automatically detected and converted.
Must be wrapped in quotes.""")
args = parser.parse_args()
out = decode(args.msg[0]) # type: str
print("{}".format(out))
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