base45: Implement highlighting

src/core/lib/Base45.mjs

@@ -0,0 +1,27 @@
+/**
+ * Base45 resources.
+ *
+ * @author Thomas Weißschuh [thomas@t-8ch.de]
+ * @copyright Crown Copyright 2021
+ * @license Apache-2.0
+ */
+
+/**
+ * Highlight to Base45
+ */
+export function highlightToBase45(pos, args) {
+    pos[0].start = Math.floor(pos[0].start / 2) * 3;
+    pos[0].end = Math.ceil(pos[0].end / 2) * 3;
+    return pos;
+}
+
+/**
+ * Highlight from Base45
+ */
+export function highlightFromBase45(pos, args) {
+    pos[0].start = Math.floor(pos[0].start / 3) * 2;
+    pos[0].end = Math.ceil(pos[0].end / 3) * 2;
+    return pos;
+}
+
+export const ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:";