ESM: Ported SeqUtils operations

src/core/operations/CountOccurrences.mjs

@@ -0,0 +1,65 @@
+/**
+ * @author n1474335 [n1474335@gmail.com]
+ * @copyright Crown Copyright 2016
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation";
+import Utils from "../Utils";
+
+/**
+ * Count occurrences operation
+ */
+class CountOccurrences extends Operation {
+
+    /**
+     * CountOccurrences constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Count occurrences";
+        this.module = "Default";
+        this.description = "Counts the number of times the provided string occurs in the input.";
+        this.inputType = "string";
+        this.outputType = "number";
+        this.args = [
+            {
+                "name": "Search string",
+                "type": "toggleString",
+                "value": "",
+                "toggleValues": ["Regex", "Extended (\\n, \\t, \\x...)", "Simple string"]
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {number}
+     */
+    run(input, args) {
+        let search = args[0].string;
+        const type = args[0].option;
+
+        if (type === "Regex" && search) {
+            try {
+                const regex = new RegExp(search, "gi"),
+                    matches = input.match(regex);
+                return matches.length;
+            } catch (err) {
+                return 0;
+            }
+        } else if (search) {
+            if (type.indexOf("Extended") === 0) {
+                search = Utils.parseEscapedChars(search);
+            }
+            return input.count(search);
+        } else {
+            return 0;
+        }
+    }
+
+}
+
+export default CountOccurrences;