Added 'CSV to JSON' and 'JSON to CSV' operations. Closes #277

src/core/operations/CSVToJSON.mjs

@@ -0,0 +1,80 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2018
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import OperationError from "../errors/OperationError";
+import Utils from "../Utils";
+
+/**
+ * CSV to JSON operation
+ */
+class CSVToJSON extends Operation {
+
+    /**
+     * CSVToJSON constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "CSV to JSON";
+        this.module = "Default";
+        this.description = "Converts a CSV file to JSON format.";
+        this.infoURL = "https://wikipedia.org/wiki/Comma-separated_values";
+        this.inputType = "string";
+        this.outputType = "JSON";
+        this.args = [
+            {
+                name: "Cell delimiters",
+                type: "binaryShortString",
+                value: ","
+            },
+            {
+                name: "Row delimiters",
+                type: "binaryShortString",
+                value: "\\r\\n"
+            },
+            {
+                name: "Format",
+                type: "option",
+                value: ["Array of dictionaries", "Array of arrays"]
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {JSON}
+     */
+    run(input, args) {
+        const [cellDelims, rowDelims, format] = args;
+        let json, header;
+
+        try {
+            json = Utils.parseCSV(input, cellDelims.split(""), rowDelims.split(""));
+        } catch (err) {
+            throw new OperationError("Unable to parse CSV: " + err);
+        }
+
+        switch (format) {
+            case "Array of dictionaries":
+                header = json[0];
+                return json.slice(1).map(row => {
+                    const obj = {};
+                    header.forEach((h, i) => {
+                        obj[h] = row[i];
+                    });
+                    return obj;
+                });
+            case "Array of arrays":
+            default:
+                return json;
+        }
+    }
+
+}
+
+export default CSVToJSON;