main.py

# Import Tkinter module
from tkinter import *
from tkinter import messagebox

# Create a window
root = Tk()

# Create global variables
variable1 = StringVar(root)
variable2 = StringVar(root)

# Initialise the variables
variable1.set("Language select")
variable2.set("Language select")

"""
VARIABLE KEY
'cipher' -> 'stores the morse translated form of the english string'
'decipher' -> 'stores the english translated form of the morse string'
'citext' -> 'stores morse code of a single character'
'i' -> 'keeps count of the spaces between morse characters'
'message' -> 'stores the string to be encoded or decoded'
"""

# Dictionary representing the morse code chart
MORSE_CODE_DICT = {
    "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": "--..", "1": ".----", "2": "..---", "3": "...--",
    "4": "....-", "5": ".....", "6": "-....", "7": "--...", "8": "---..",
    "9": "----.", "0": "-----", ", ": "--..--", ".": ".-.-.-", "?": "..--..",
    "/": "-..-.", "-": "-....-", "(": "-.--.", ")": "-.--.-", "!": "-.-.--",
    "&": ".-...", ":": "---...", ";": "-.-.-.", "=": "-...-", "+": ".-.-.",
    "_": "..--.-", "\"": ".-..-.", "$": "...-..-", "@": ".--.-."
}

# Function to clear both the text areas
def clearAll():
    # whole content of text area is deleted
    language1_field.delete(1.0, END)
    language2_field.delete(1.0, END)

# Function to perform conversion from one language to another
def convert():
    # get a whole input content from text box ignoring \n from the text box content
    message = language1_field.get("1.0", "end")[:-1]

    # get the content from variable1 and 2, check their values
    if variable1.get() == variable2.get():
        # show the error message
        messagebox.showerror("Can't Be same Language")
        return

    elif variable1.get() == "English" and variable2.get() == "Morse Code":
        # function call for encryption
        rslt = encrypt(message)

    elif variable1.get() == "Morse Code" and variable2.get() == "English":
        # function call for decryption
        rslt = decrypt(message)

    else:
        # show the error message
        messagebox.showerror("please choose valid language code..")
        return

    # insert content into text area from rslt variable
    language2_field.delete(1.0, END)
    language2_field.insert("end -1 chars", rslt)

# Function to encrypt the string according to the morse code chart
def encrypt(message):
    cipher = ""
    for letter in message:
        if letter.isalpha():
            cipher += MORSE_CODE_DICT[letter.upper()] + " "
        elif letter != " ":
            # Looks up the dictionary and adds the corresponding morse code
            cipher += MORSE_CODE_DICT[letter] + " "
        else:
            # 1 space indicates different characters, 2 spaces indicate different words
            cipher += " "
    return cipher

# Function to decrypt the string from morse to english
def decrypt(message):
    # extra space added at the end to access the last morse code
    message += " "
    decipher = ""
    citext = ""
    for letter in message:
        # checks for space
        if letter != " ":
            # counter to keep track of space
            i = 0
            # storing morse code of a single character
            citext += letter
        else:
            # if i = 1 that indicates a new character
            i += 1
            if i == 2:
                # adding space to separate words
                decipher += " "
            else:
                # accessing the keys using their values (reverse of encryption)
                decipher += list(MORSE_CODE_DICT.keys())[list(MORSE_CODE_DICT.values()).index(citext)]
                citext = ""
    return decipher

# Driver code
if __name__ == "__main__":
    # Set the background colour of GUI window
    root.configure()

    # Set the configuration of GUI window (WidthxHeight)
    root.geometry("450x400")

    # set the name of tkinter GUI window
    root.title("Morse Code Translator")

    # Create Welcome to Morse Code Translator label
    headlabel = Label(root, text="Welcome to Morse Code Translator", fg="black", justify="center")

    # Create labels for input and conversion fields
    label1 = Label(root, text="First Language : Input", fg="black")
    label2 = Label(root, text="Second Language : To Convert", fg="black")

    # grid method is used for placing widgets at respective positions
    headlabel.grid(row=0, column=1)
    label1.grid(row=2, column=0)
    label2.grid(row=3, column=0)

    # Create text area boxes for input and output
    language1_field = Text(root, height=5, width=25, font="lucida 13")
    language2_field = Text(root, height=5, width=25, font="lucida 13")

    # padx keyword argument used to set padding along x-axis
    language1_field.grid(row=1, column=1, padx=10)
    language2_field.grid(row=5, column=1, padx=10)

    # list of language codes
    languageCode_list = ["English", "Morse Code"]

    # create drop down menus for selecting languages
    FromLanguage_option = OptionMenu(root, variable1, *languageCode_list)
    ToLanguage_option = OptionMenu(root, variable2, *languageCode_list)

    FromLanguage_option.grid(row=2, column=1, ipadx=10)
    ToLanguage_option.grid(row=3, column=1, ipadx=10)

    # Create buttons for Convert and Clear functionalities
    button1 = Button(root, text="Convert", bg="gray", fg="black", command=convert, cursor="hand2")
    button1.grid(row=4, column=1)

    button2 = Button(root, text="Clear", bg="red", fg="black", command=clearAll, padx=10, cursor="hand2")
    button2.grid(row=6, column=1)

    # Start the GUI
    root.mainloop()