mirror of
https://github.com/gchq/CyberChef.git
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161 lines
5.3 KiB
JavaScript
161 lines
5.3 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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/**
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* Generic Code Beautify operation
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*/
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class GenericCodeBeautify extends Operation {
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/**
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* GenericCodeBeautify constructor
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*/
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constructor() {
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super();
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this.name = "Generic Code Beautify";
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this.module = "Code";
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this.description = "Attempts to pretty print C-style languages such as C, C++, C#, Java, PHP, JavaScript etc.<br><br>This will not do a perfect job, and the resulting code may not work any more. This operation is designed purely to make obfuscated or minified code more easy to read and understand.<br><br>Things which will not work properly:<ul><li>For loop formatting</li><li>Do-While loop formatting</li><li>Switch/Case indentation</li><li>Certain bit shift operators</li></ul>";
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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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/**
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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 preservedTokens = [];
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let code = input,
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t = 0,
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m;
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// Remove strings
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const sstrings = /'([^'\\]|\\.)*'/g;
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while ((m = sstrings.exec(code))) {
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code = preserveToken(code, m, t++);
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sstrings.lastIndex = m.index;
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}
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const dstrings = /"([^"\\]|\\.)*"/g;
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while ((m = dstrings.exec(code))) {
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code = preserveToken(code, m, t++);
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dstrings.lastIndex = m.index;
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}
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// Remove comments
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const scomments = /\/\/[^\n\r]*/g;
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while ((m = scomments.exec(code))) {
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code = preserveToken(code, m, t++);
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scomments.lastIndex = m.index;
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}
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const mcomments = /\/\*[\s\S]*?\*\//gm;
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while ((m = mcomments.exec(code))) {
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code = preserveToken(code, m, t++);
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mcomments.lastIndex = m.index;
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}
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const hcomments = /(^|\n)#[^\n\r#]+/g;
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while ((m = hcomments.exec(code))) {
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code = preserveToken(code, m, t++);
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hcomments.lastIndex = m.index;
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}
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// Remove regexes
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const regexes = /\/.*?[^\\]\/[gim]{0,3}/gi;
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while ((m = regexes.exec(code))) {
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code = preserveToken(code, m, t++);
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regexes.lastIndex = m.index;
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}
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code = code
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// Create newlines after ;
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.replace(/;/g, ";\n")
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// Create newlines after { and around }
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.replace(/{/g, "{\n")
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.replace(/}/g, "\n}\n")
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// Remove carriage returns
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.replace(/\r/g, "")
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// Remove all indentation
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.replace(/^\s+/g, "")
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.replace(/\n\s+/g, "\n")
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// Remove trailing spaces
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.replace(/\s*$/g, "")
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.replace(/\n{/g, "{");
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// Indent
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let i = 0,
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level = 0,
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indent;
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while (i < code.length) {
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switch (code[i]) {
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case "{":
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level++;
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break;
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case "\n":
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if (i+1 >= code.length) break;
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if (code[i+1] === "}") level--;
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indent = (level >= 0) ? Array(level*4+1).join(" ") : "";
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code = code.substring(0, i+1) + indent + code.substring(i+1);
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if (level > 0) i += level*4;
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break;
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}
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i++;
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}
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code = code
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// Add strategic spaces
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.replace(/\s*([!<>=+-/*]?)=\s*/g, " $1= ")
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.replace(/\s*<([=]?)\s*/g, " <$1 ")
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.replace(/\s*>([=]?)\s*/g, " >$1 ")
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.replace(/([^+])\+([^+=])/g, "$1 + $2")
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.replace(/([^-])-([^-=])/g, "$1 - $2")
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.replace(/([^*])\*([^*=])/g, "$1 * $2")
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.replace(/([^/])\/([^/=])/g, "$1 / $2")
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.replace(/\s*,\s*/g, ", ")
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.replace(/\s*{/g, " {")
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.replace(/}\n/g, "}\n\n")
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// Hacky horribleness
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.replace(/(if|for|while|with|elif|elseif)\s*\(([^\n]*)\)\s*\n([^{])/gim, "$1 ($2)\n $3")
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.replace(/(if|for|while|with|elif|elseif)\s*\(([^\n]*)\)([^{])/gim, "$1 ($2) $3")
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.replace(/else\s*\n([^{])/gim, "else\n $1")
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.replace(/else\s+([^{])/gim, "else $1")
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// Remove strategic spaces
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.replace(/\s+;/g, ";")
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.replace(/\{\s+\}/g, "{}")
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.replace(/\[\s+\]/g, "[]")
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.replace(/}\s*(else|catch|except|finally|elif|elseif|else if)/gi, "} $1");
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// Replace preserved tokens
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const ptokens = /###preservedToken(\d+)###/g;
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while ((m = ptokens.exec(code))) {
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const ti = parseInt(m[1], 10);
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code = code.substring(0, m.index) + preservedTokens[ti] + code.substring(m.index + m[0].length);
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ptokens.lastIndex = m.index;
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}
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return code;
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/**
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* Replaces a matched token with a placeholder value.
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*/
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function preserveToken(str, match, t) {
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preservedTokens[t] = match[0];
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return str.substring(0, match.index) +
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"###preservedToken" + t + "###" +
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str.substring(match.index + match[0].length);
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}
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}
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}
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export default GenericCodeBeautify;
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