From f81beea264c0db1b3f68d0ff7ac19b7cab62aa76 Mon Sep 17 00:00:00 2001
From: Benjamin Calderon <ben@addigence.com>
Date: Sun, 18 Aug 2024 21:57:48 -0400
Subject: [PATCH] initial

---
 src/core/config/Categories.json |  3 +-
 src/core/operations/Ngram.mjs   | 52 +++++++++++++++++++++++++++++++++
 2 files changed, 54 insertions(+), 1 deletion(-)
 create mode 100644 src/core/operations/Ngram.mjs

diff --git a/src/core/config/Categories.json b/src/core/config/Categories.json
index bebdd6a5..79ff6007 100644
--- a/src/core/config/Categories.json
+++ b/src/core/config/Categories.json
@@ -320,7 +320,8 @@
             "Unescape string",
             "Pseudo-Random Number Generator",
             "Sleep",
-            "File Tree"
+            "File Tree",
+            "Ngram"
         ]
     },
     {
diff --git a/src/core/operations/Ngram.mjs b/src/core/operations/Ngram.mjs
new file mode 100644
index 00000000..fbcbfce7
--- /dev/null
+++ b/src/core/operations/Ngram.mjs
@@ -0,0 +1,52 @@
+/**
+ * @author benjcal [benj.calderon@gmail.com]
+ * @copyright Crown Copyright 2024
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+
+/**
+ * ngram operation
+ */
+class Ngram extends Operation {
+
+    /**
+     * Ngram constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Ngram";
+        this.module = "Default";
+        this.description = "Extracts n-grams from the input text. N-grams are contiguous sequences of n characters from a given text sample.";
+        this.infoURL = "https://wikipedia.org/wiki/N-gram";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [
+            {
+                name: "N-gram size",
+                type: "number",
+                value: 3
+            },
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    run(input, args) {
+        const n = args[0];
+        const ngrams = [];
+        for (let i = 0; i <= input.length - n; i++) {
+            ngrams.push(input.slice(i, i + n));
+        }
+
+        return ngrams.join("\n");
+    }
+
+}
+
+export default Ngram;