added PHP Serialize operation

src/core/operations/PHPSerialize.mjs

@@ -0,0 +1,144 @@
+/**
+ * @author brun0ne [brunonblok@gmail.com]
+ * @copyright Crown Copyright 2023
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import OperationError from "../errors/OperationError.mjs";
+
+/**
+ * PHP Serialize operation
+ */
+class PHPSerialize extends Operation {
+
+    /**
+     * PHPSerialize constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "PHP Serialize";
+        this.module = "Default";
+        this.description = "Performs PHP serialization on JSON data.<br><br>This function does not support <code>object</code> tags.<br><br>Since PHP doesn't distinguish dicts and arrays, this operation is not always symmetric to <code>PHP Deserialize</code>.<br><br>Example:<br><code>[5,&quot;abc&quot;,true]</code><br>becomes<br><code>a:3:{i:0;i:5;i:1;s:3:&quot;abc&quot;;i:2;b:1;}<code>";
+        this.infoURL = "https://www.phpinternalsbook.com/php5/classes_objects/serialization.html";
+        this.inputType = "JSON";
+        this.outputType = "string";
+        this.args = [];
+    }
+
+    /**
+     * @param {JSON} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        /**
+         * Determines if a number is an integer
+         * @param {number} value 
+         * @returns {boolean}
+         */
+        function isInteger(value) {
+            return typeof value === "number" && parseInt(value.toString(), 10) === value;
+        }
+
+        /**
+         * Serialize basic types
+         * @param {string | number | boolean} content 
+         * @returns {string}
+         */
+        function serializeBasicTypes(content) {
+            const basicTypes = {
+                "string": "s",
+                "integer": "i",
+                "float": "d",
+                "boolean": "b"
+            };
+        
+            /**
+             * Booleans
+             * cast to 0 or 1
+             */
+            if (typeof content === "boolean"){
+                return `${basicTypes["boolean"]}:${content ? 1 : 0}`;
+            }
+            
+            /**
+             * Numbers
+             */
+            if (typeof content === "number"){
+                if (isInteger(content)){
+                    return `${basicTypes["integer"]}:${content.toString()}`
+                }
+                else {
+                    return `${basicTypes["float"]}:${content.toString()}`
+                }
+            }
+        
+            /**
+             * Strings
+             */
+            if (typeof content === "string")
+                return `${basicTypes["string"]}:${content.length}:"${content}"`;
+            
+            /** This should be unreachable */
+            throw new OperationError(`Encountered a non-implemented type: ${typeof content}`);
+        }
+
+        /**
+         * Recursively serialize
+         * @param {*} object 
+         * @returns {string}
+         */
+        function serialize(object) {
+            /**
+             * Null
+             */
+            if (object == null) {
+                return `N;`
+            }
+        
+            /**
+             * Basic types
+             */
+            if (typeof object !== "object"){
+                return `${serializeBasicTypes(object)};`;
+            }
+        
+            /**
+             * Arrays
+             */
+            else if (object instanceof Array) {
+                const serializedElements = [];
+        
+                for (let i = 0; i < object.length; i++) {
+                    serializedElements.push(`${serialize(i)}${serialize(object[i])}`);
+                }
+        
+                return `a:${object.length}:{${serializedElements.join("")}}`
+            }
+        
+            /**
+             * Objects
+             * Note: the output cannot be guaranteed to be in the same order as the input 
+             */
+            else if (object instanceof Object) {
+                const serializedElements = [];
+                const keys = Object.keys(object);
+        
+                for (const key of keys) {
+                    serializedElements.push(`${serialize(key)}${serialize(object[key])}`);
+                }
+        
+                return `a:${keys.length}:{${serializedElements.join("")}}`
+            }
+
+            /** This should be unreachable */
+            throw new OperationError(`Encountered a non-implemented type: ${typeof object}`);
+        }
+
+        return serialize(input);
+    }
+}
+
+export default PHPSerialize;