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122 lines
3.1 KiB
PHP
122 lines
3.1 KiB
PHP
<?php
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/**
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* Encode text to Morse Code.
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*
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* @param string text to encode
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* @return string encoded text
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*/
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function encode(string $text): string
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{
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$text = strtoupper($text); // Makes sure the string is uppercase
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$MORSE_CODE = array( // Array containing morse code translations
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"A" => ".-",
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"B" => "-...",
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"C" => "-.-.",
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"D" => "-..",
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"E" => ".",
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"F" => "..-.",
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"G" => "--.",
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"H" => "....",
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"I" => "..",
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"J" => ".---",
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"K" => "-.-",
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"L" => ".-..",
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"M" => "--",
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"N" => "-.",
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"O" => "---",
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"P" => ".--.",
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"Q" => "--.-",
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"R" => ".-.",
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"S" => "...",
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"T" => "-",
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"U" => "..-",
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"V" => "...-",
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"W" => ".--",
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"X" => "-..-",
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"Y" => "-.--",
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"Z" => "--..",
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"1" => ".----",
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"2" => "..---",
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"3" => "...--",
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"4" => "....-",
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"5" => ".....",
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"6" => "-....",
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"7" => "--...",
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"8" => "---..",
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"9" => "----.",
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"0" => "-----",
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" " => "/"
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);
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$encodedText = ""; // Stores the encoded text
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foreach (str_split($text) as $c) { // Going through each character
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if (array_key_exists($c, $MORSE_CODE)) { // Checks if it is a valid character
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$encodedText .= $MORSE_CODE[$c] . " "; // Appends the correct character
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} else {
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throw new \Exception("Invalid character: $c");
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}
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}
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substr_replace($encodedText ,"", -1); // Removes trailing space
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return $encodedText;
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}
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/**
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* Decode Morse Code to text.
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* @param string text to decode
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*/
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function decode(string $text): string
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{
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$MORSE_CODE = array( // An array containing morse code to text translations
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".-" => "A",
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"-..." => "B",
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"-.-." => "C",
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"-.." => "D",
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"." => "E",
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"..-." => "F",
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"--." => "G",
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"...." => "H",
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".." => "I",
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".---" => "J",
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"-.-" => "K",
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".-.." => "L",
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"--" => "M",
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"-." => "N",
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"---" => "O",
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".--." => "P",
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"--.-" => "Q",
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".-." => "R",
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"..." => "S",
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"-" => "T",
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"..-" => "U",
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"...-" => "V",
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".--" => "W",
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"-..-" => "X",
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"-.--" => "Y",
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"--.." => "Z",
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".----" => "1",
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"..---" => "2",
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"...--" => "3",
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"....-" => "4",
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"....." => "5",
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"-...." => "6",
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"--..." => "7",
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"---.." => "8",
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"----." => "9",
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"-----" => "0",
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"/" => " "
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);
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$decodedText = ""; // Stores the decoded text
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foreach (explode(" ", $text) as $c) { // Going through each group
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if (array_key_exists($c, $MORSE_CODE)) { // Checks if it is a valid character
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$decodedText .= $MORSE_CODE[$c]; // Appends the correct character
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} else {
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if ($c) { // Makes sure that the string is not empty to prevent trailing spaces or extra spaces from breaking this
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throw new \Exception("Invalid character: $c");
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}
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}
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}
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return $decodedText;
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}
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