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25 lines
667 B
JavaScript
25 lines
667 B
JavaScript
// noinspection FunctionNamingConventionJS
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/**
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* Applies the ROT13 cipher to the selected input text.
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*/
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export function applyROT13() {
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const activeElement = document.activeElement;
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const inputValue = activeElement?.value;
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if (!inputValue) {
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return;
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}
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const selection = inputValue.substring(activeElement.selectionStart, activeElement.selectionEnd);
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if (!selection) {
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return;
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}
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// noinspection JSDeprecatedSymbols
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document.execCommand("insertText", false, selection.replace(/[a-zA-Z]/g, function(chr) {
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const code = chr.charCodeAt(0);
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const start = code <= 90 ? 65 : 97;
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return String.fromCharCode(start + (code - start + 13) % 26);
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}));
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}
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