mirror of https://github.com/gchq/CyberChef.git
75 lines
1.8 KiB
JavaScript
75 lines
1.8 KiB
JavaScript
/**
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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* @license Apache-2.0
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*/
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import Operation from "../Operation.mjs";
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import Utils from "../Utils.mjs";
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/**
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* Unescape Unicode Characters operation
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*/
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class UnescapeUnicodeCharacters extends Operation {
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/**
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* UnescapeUnicodeCharacters constructor
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*/
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constructor() {
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super();
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this.name = "Unescape Unicode Characters";
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this.module = "Default";
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this.description = "Converts unicode-escaped character notation back into raw characters.<br><br>Supports the prefixes:<ul><li><code>\\u</code></li><li><code>%u</code></li><li><code>U+</code></li></ul>e.g. <code>\\u03c3\\u03bf\\u03c5</code> becomes <code>σου</code>";
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this.inputType = "string";
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this.outputType = "string";
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this.args = [
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{
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"name": "Prefix",
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"type": "option",
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"value": ["\\u", "%u", "U+"]
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}
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];
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}
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/**
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* @param {string} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run(input, args) {
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const prefix = prefixToRegex[args[0]],
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regex = new RegExp(prefix+"([a-f\\d]{4})", "ig");
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let output = "",
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m,
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i = 0;
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while ((m = regex.exec(input))) {
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// Add up to match
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output += input.slice(i, m.index);
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// Add match
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output += Utils.chr(parseInt(m[1], 16));
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i = regex.lastIndex;
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}
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// Add all after final match
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output += input.slice(i, input.length);
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return output;
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}
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}
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/**
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* Lookup table to add prefixes to unicode delimiters so that they can be used in a regex.
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*/
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const prefixToRegex = {
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"\\u": "\\\\u",
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"%u": "%u",
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"U+": "U\\+"
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};
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export default UnescapeUnicodeCharacters;
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