ESM: Ported case converters, generic beautifier and syntax highlighting

src/core/operations/GenericCodeBeautify.mjs

@@ -0,0 +1,161 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+
+/**
+ * Generic Code Beautify operation
+ */
+class GenericCodeBeautify extends Operation {
+
+    /**
+     * GenericCodeBeautify constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Generic Code Beautify";
+        this.module = "Code";
+        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>";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const preservedTokens = [];
+        let code = input,
+            t = 0,
+            m;
+
+        // Remove strings
+        const sstrings = /'([^'\\]|\\.)*'/g;
+        while ((m = sstrings.exec(code))) {
+            code = preserveToken(code, m, t++);
+            sstrings.lastIndex = m.index;
+        }
+
+        const dstrings = /"([^"\\]|\\.)*"/g;
+        while ((m = dstrings.exec(code))) {
+            code = preserveToken(code, m, t++);
+            dstrings.lastIndex = m.index;
+        }
+
+        // Remove comments
+        const scomments = /\/\/[^\n\r]*/g;
+        while ((m = scomments.exec(code))) {
+            code = preserveToken(code, m, t++);
+            scomments.lastIndex = m.index;
+        }
+
+        const mcomments = /\/\*[\s\S]*?\*\//gm;
+        while ((m = mcomments.exec(code))) {
+            code = preserveToken(code, m, t++);
+            mcomments.lastIndex = m.index;
+        }
+
+        const hcomments = /(^|\n)#[^\n\r#]+/g;
+        while ((m = hcomments.exec(code))) {
+            code = preserveToken(code, m, t++);
+            hcomments.lastIndex = m.index;
+        }
+
+        // Remove regexes
+        const regexes = /\/.*?[^\\]\/[gim]{0,3}/gi;
+        while ((m = regexes.exec(code))) {
+            code = preserveToken(code, m, t++);
+            regexes.lastIndex = m.index;
+        }
+
+        code = code
+            // Create newlines after ;
+            .replace(/;/g, ";\n")
+            // Create newlines after { and around }
+            .replace(/{/g, "{\n")
+            .replace(/}/g, "\n}\n")
+            // Remove carriage returns
+            .replace(/\r/g, "")
+            // Remove all indentation
+            .replace(/^\s+/g, "")
+            .replace(/\n\s+/g, "\n")
+            // Remove trailing spaces
+            .replace(/\s*$/g, "")
+            .replace(/\n{/g, "{");
+
+        // Indent
+        let i = 0,
+            level = 0,
+            indent;
+        while (i < code.length) {
+            switch (code[i]) {
+                case "{":
+                    level++;
+                    break;
+                case "\n":
+                    if (i+1 >= code.length) break;
+
+                    if (code[i+1] === "}") level--;
+                    indent = (level >= 0) ? Array(level*4+1).join(" ") : "";
+
+                    code = code.substring(0, i+1) + indent + code.substring(i+1);
+                    if (level > 0) i += level*4;
+                    break;
+            }
+            i++;
+        }
+
+        code = code
+            // Add strategic spaces
+            .replace(/\s*([!<>=+-/*]?)=\s*/g, " $1= ")
+            .replace(/\s*<([=]?)\s*/g, " <$1 ")
+            .replace(/\s*>([=]?)\s*/g, " >$1 ")
+            .replace(/([^+])\+([^+=])/g, "$1 + $2")
+            .replace(/([^-])-([^-=])/g, "$1 - $2")
+            .replace(/([^*])\*([^*=])/g, "$1 * $2")
+            .replace(/([^/])\/([^/=])/g, "$1 / $2")
+            .replace(/\s*,\s*/g, ", ")
+            .replace(/\s*{/g, " {")
+            .replace(/}\n/g, "}\n\n")
+            // Hacky horribleness
+            .replace(/(if|for|while|with|elif|elseif)\s*\(([^\n]*)\)\s*\n([^{])/gim, "$1 ($2)\n    $3")
+            .replace(/(if|for|while|with|elif|elseif)\s*\(([^\n]*)\)([^{])/gim, "$1 ($2) $3")
+            .replace(/else\s*\n([^{])/gim, "else\n    $1")
+            .replace(/else\s+([^{])/gim, "else $1")
+            // Remove strategic spaces
+            .replace(/\s+;/g, ";")
+            .replace(/\{\s+\}/g, "{}")
+            .replace(/\[\s+\]/g, "[]")
+            .replace(/}\s*(else|catch|except|finally|elif|elseif|else if)/gi, "} $1");
+
+        // Replace preserved tokens
+        const ptokens = /###preservedToken(\d+)###/g;
+        while ((m = ptokens.exec(code))) {
+            const ti = parseInt(m[1], 10);
+            code = code.substring(0, m.index) + preservedTokens[ti] + code.substring(m.index + m[0].length);
+            ptokens.lastIndex = m.index;
+        }
+
+        return code;
+
+        /**
+         * Replaces a matched token with a placeholder value.
+         */
+        function preserveToken(str, match, t) {
+            preservedTokens[t] = match[0];
+            return str.substring(0, match.index) +
+                "###preservedToken" + t + "###" +
+                str.substring(match.index + match[0].length);
+        }
+    }
+
+}
+
+export default GenericCodeBeautify;