1 files changed, 48 insertions, 0 deletions
diff --git a/ext/js/core/api-map.js b/ext/js/core/api-map.js
new file mode 100644
index 00000000..eb4abeea
--- /dev/null
+++ b/ext/js/core/api-map.js
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2023  Yomitan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @template {import('api-map').ApiSurface} [TApiSurface=never]
+ * @param {import('api-map').ApiMapInit<TApiSurface>} init
+ * @returns {import('api-map').ApiMap<TApiSurface>}
+ */
+export function createApiMap(init) {
+    return new Map(init);
+}
+
+/**
+ * @template {import('api-map').ApiSurface} [TApiSurface=never]
+ * @param {import('api-map').ApiMap<TApiSurface>} map
+ * @param {import('api-map').ApiMapInit<TApiSurface>} init
+ * @throws {Error}
+ */
+export function extendApiMap(map, init) {
+    for (const [key, value] of init) {
+        if (map.has(key)) { throw new Error(`The handler for ${String(key)} has already been registered`); }
+        map.set(key, value);
+    }
+}
+
+/**
+ * @template {import('api-map').ApiSurface} [TApiSurface=never]
+ * @param {import('api-map').ApiMap<TApiSurface>} map
+ * @param {string} name
+ * @returns {import('api-map').ApiHandlerAny<TApiSurface>|undefined}
+ */
+export function getApiMapHandler(map, name) {
+    return map.get(/** @type {import('api-map').ApiNames<TApiSurface>} */ (name));
+}