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Q: Spy Master - JavaScript task

+3 votes

You are the spy master of a guild of spies, since you’re all carefully watched, your spies communicate with you by leaving encoded messages. You will receive a special key and lines of text which you must comb in order to find the encoded messages.

The special key will consist only of one or more English letters.

  • The special key must be preceded by either a space or the start of the string in order to be considered valid in the string.
  • The special key may appear in any casing (its letters could be a random mix of lower and uppercase) in the lines of text.


Valid encoded messages must meet these requirements:

  • An encoded message must immediately follow the special key, being separated from it only by one or more spaces.
  • An encoded message must be at least 8 symbols long and consist only of the symbols !, %, $, # or Capital English letters.
  • The encoded message must be followed by a space, a dot (.), a comma (,) or the end of the string.


After finding the correct encoded messages, you must decode and replace them in the original text. The decoding should be as follows:

  •  The symbol ! becomes the number 1
  •  The symbol % becomes the number 2
  •  The symbol # becomes the number 3
  •  The symbol $ should become the number 4
  •  Capital English letters should become their lower case counterparts

Constraints

  •  A pair of a special key and encoded message will never be split between multiple lines.
  •  The preceding space before a special key will never overlap with a trailing space after an encoded message.
  •  There will never be an encoded message equal to the special key.


Input
The input comes as an array of strings - the first element is the special key, each element after it is a line of text.

Output
The output should be printed on the console - consisting of the entire text with the correct encoded messages replaced with their decoded versions, each line of text on a new line.

Examples:

Input:
specialKey
In this text the specialKey HELLOWORLD! is correct, but
the following specialKey $HelloWorl#d and spEcIaLKEy HOLLOWORLD1 are not, while
SpeCIaLkeY   SOM%%ETH$IN and SPECIALKEY ##$$##$$ are!

Output:
In this text the specialKey helloworld1 is correct, but
the following specialKey $HelloWorl#d and spEcIaLKEy HOLLOWORLD1 are not, while
SpeCIaLkeY   som22eth4in and SPECIALKEY 33443344 are!


Input:
enCode
Some messages are just not encoded what can you do?
RE - ENCODE THEMNOW! - he said.
Damn encode, ITSALLHETHINKSABOUT, eNcoDe BULL$#!%.

Output:
Some messages are just not encoded what can you do?
RE - ENCODE themnow1 - he said.
Damn encode, ITSALLHETHINKSABOUT, eNcoDe bull4312.

asked in JavaScript category by user john7

1 Answer

+1 vote

Here is the solution:

function spyMaster(inputStrings) {
    let specialKey = inputStrings[0];
    let pattern = `(\\s|^)(${specialKey}\\s+)([!#$%A-Z]{8,})(\\.|,|\\s|$)`;
    let rgx = new RegExp(pattern, "gi");

    for (let i = 1; i < inputStrings.length; i++) {//starts from 1 because we do not want to take the first element which is the special key
        let currentString = inputStrings[i];
        let match;
        while (match = rgx.exec(currentString)) {
            let encodedWord = match[3];
            if (encodedWord.toUpperCase() !== encodedWord) {
                continue;
            }
            let decodedWord = decodeWord(encodedWord);
            let decodedMatch = match[1] + match[2] + decodedWord + match[4];
            currentString = currentString.replace(match[0],decodedMatch);
        }
        console.log(currentString);
    }

    function decodeWord(encodedWord) {
        while (encodedWord.indexOf("!") !== -1) {
            encodedWord = encodedWord.replace("!", "1");
        }
        while (encodedWord.indexOf("%") !== -1) {
            encodedWord = encodedWord.replace("%", "2");
        }
        while (encodedWord.indexOf("#") !== -1) {
            encodedWord = encodedWord.replace("#", "3");
        }
        while (encodedWord.indexOf("$") !== -1) {
            encodedWord = encodedWord.replace("$", "4");
        }
        return encodedWord.toLowerCase();
    }
}

spyMaster([
    "specialKey",
    "In this text the specialKey HELLOWORLD! is correct, but",
    "the following specialKey $HelloWorl#d and spEcIaLKEy HOLLOWORLD1 are not, while",
    "SpeCIaLkeY   SOM%%ETH$IN and SPECIALKEY ##$$##$$ are!"
]);

//spyMaster([
//    "enCode",
//    "Some messages are just not encoded what can you do?",
//    "RE - ENCODE THEMNOW! - he said.",
//    "Damn encode, ITSALLHETHINKSABOUT, eNcoDe BULL$#!%."
//]);

 

answered by user richard8502
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