Pull SetUnion into its own operation

src/core/operations/SetUnion.mjs

@@ -1,19 +1,63 @@
-import SetOp from "./SetOps";
+import Utils from "../Utils";
+import Operation from "../Operation";
 
 /**
- * 
+ * Set Union operation
  */
-class SetUnion extends SetOp {
+class SetUnion extends Operation {
 
     /**
-     * 
+     * Set Union constructor
      */
     constructor() {
         super();
-        this.setOp = this.runUnion;
 
         this.name = "Set Union";
+        this.module = "Default";
         this.description = "Get the union of two sets";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                name: "Sample delimiter",
+                type: "binaryString",
+                value: Utils.escapeHtml("\\n\\n")
+            },
+            {
+                name: "Item delimiter",
+                type: "binaryString",
+                value: ","
+            },
+        ];
+    }
+
+    /**
+     * Validate input length
+     * @param {Object[]} sets
+     * @throws {Error} if not two sets
+     */
+    validateSampleNumbers(sets) {
+        if (!sets || (sets.length !== 2)) {
+            throw "Incorrect number of sets, perhaps you need to modify the sample delimiter or add more samples?";
+        }
+    }
+
+    /**
+     * Run the union operation
+     * @param input
+     * @param args
+     */
+    run(input, args) {
+        [this.sampleDelim, this.itemDelimiter] = args;
+        const sets = input.split(this.sampleDelim);
+
+        try {
+            this.validateSampleNumbers(sets);
+        } catch (e) {
+            return e;
+        }
+
+        return Utils.escapeHtml(this.runUnion(...sets.map(s => s.split(this.itemDelimiter))));
     }
 
     /**