Ported rest of Code ops & enabled/fixed some tests

src/core/operations/JPathExpression.mjs

@@ -0,0 +1,68 @@
+/**
+ * @author Matt C (matt@artemisbot.uk)
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import jpath from "jsonpath";
+import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
+
+/**
+ * JPath expression operation
+ */
+class JPathExpression extends Operation {
+
+    /**
+     * JPathExpression constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "JPath expression";
+        this.module = "Code";
+        this.description = "Extract information from a JSON object with a JPath query.";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                "name": "Query",
+                "type": "string",
+                "value": ""
+            },
+            {
+                "name": "Result delimiter",
+                "type": "binaryShortString",
+                "value": "\\n"
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const [query, delimiter] = args;
+        let results,
+            obj;
+
+        try {
+            obj = JSON.parse(input);
+        } catch (err) {
+            throw new OperationError(`Invalid input JSON: ${err.message}`);
+        }
+
+        try {
+            results = jpath.query(obj, query);
+        } catch (err) {
+            throw new OperationError(`Invalid JPath expression: ${err.message}`);
+        }
+
+        return results.map(result => JSON.stringify(result)).join(delimiter);
+    }
+
+}
+
+export default JPathExpression;