refactor progress

packages/i18n/src/interpolation/SimpleInterpolator.tsx

@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+export class SimpleInterpolator {
+	interpolate(template: string, variables: Record<string, unknown> | ReadonlyArray<unknown>): string {
+		return template.replace(/\{([^}]+)\}/g, (match, key: string) => {
+			if (/^\d+$/.test(key)) {
+				const index = Number.parseInt(key, 10);
+				if (Array.isArray(variables) && index < variables.length) {
+					return String(variables[index]);
+				}
+				return match;
+			}
+
+			if (!Array.isArray(variables)) {
+				const value = (variables as Record<string, unknown>)[key];
+				if (value !== undefined) {
+					return String(value);
+				}
+			}
+
+			return match;
+		});
+	}
+}