Init.

src/rules.ts

@@ -0,0 +1,29 @@
+type SerializedRule = { group_id: string; target_role: TargetRole };
+export type TargetRole = { guild_id: string; role_id: string };
+export class RuleSet {
+	rules;
+	constructor() {
+		this.rules = new Map<string, TargetRole[]>();
+	}
+
+	static async from_file(path: string) {
+		const result = new RuleSet();
+		const file_content = await Deno.readTextFile(path);
+		const parsed = JSON.parse(file_content) as SerializedRule[];
+		for (const { group_id, target_role } of parsed) result.append_rule(group_id, target_role);
+		return result;
+	}
+
+	private append_rule(group_id: string, target_role: TargetRole) {
+		let roles = this.rules.get(group_id);
+		if (roles === undefined) {
+			roles = [];
+			this.rules.set(group_id, roles);
+		}
+		roles.push(target_role);
+	}
+
+	roles_for_group(group_id: string) {
+		return this.rules.get(group_id) ?? [];
+	}
+}