Merged esm branch into feature-magic. Ported FileType ops.

src/core/operations/EscapeUnicodeCharacters.mjs

@@ -0,0 +1,96 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+
+/**
+ * Escape Unicode Characters operation
+ */
+class EscapeUnicodeCharacters extends Operation {
+
+    /**
+     * EscapeUnicodeCharacters constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Escape Unicode Characters";
+        this.module = "Default";
+        this.description = "Converts characters to their unicode-escaped notations.<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>σου</code> becomes <code>\\u03C3\\u03BF\\u03C5</code>";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Prefix",
+                "type": "option",
+                "value": ["\\u", "%u", "U+"]
+            },
+            {
+                "name": "Encode all chars",
+                "type": "boolean",
+                "value": false
+            },
+            {
+                "name": "Padding",
+                "type": "number",
+                "value": 4
+            },
+            {
+                "name": "Uppercase hex",
+                "type": "boolean",
+                "value": true
+            }
+        ];
+        this.patterns = [
+            {
+                match: "\\\\u(?:[\\da-f]{4,6})",
+                flags: "i",
+                args: ["\\u"]
+            },
+            {
+                match: "%u(?:[\\da-f]{4,6})",
+                flags: "i",
+                args: ["%u"]
+            },
+            {
+                match: "U\\+(?:[\\da-f]{4,6})",
+                flags: "i",
+                args: ["U+"]
+            },
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const regexWhitelist = /[ -~]/i,
+            [prefix, encodeAll, padding, uppercaseHex] = args;
+
+        let output = "",
+            character = "";
+
+        for (let i = 0; i < input.length; i++) {
+            character = input[i];
+            if (!encodeAll && regexWhitelist.test(character)) {
+                // It’s a printable ASCII character so don’t escape it.
+                output += character;
+                continue;
+            }
+
+            let cp = character.codePointAt(0).toString(16);
+            if (uppercaseHex) cp = cp.toUpperCase();
+            output += prefix + cp.padStart(padding, "0");
+        }
+
+        return output;
+    }
+
+}
+
+export default EscapeUnicodeCharacters;