Add reference counting for emote sets so that we know when to unload them. Create a class for Users so that we can use ref counting with them.

src/modules/chat/user.js

@@ -0,0 +1,82 @@
+'use strict';
+
+// ============================================================================
+// User
+// ============================================================================
+
+import {SourcedSet} from 'utilities/object';
+
+export default class User {
+	constructor(manager, room, id, login) {
+		this.manager = manager;
+		this.room = room;
+
+		this._id = id;
+		this.login = login;
+
+		if ( id )
+			(room || manager).user_ids[id] = this;
+
+		this.emote_sets = new SourcedSet;
+	}
+
+	destroy() {
+		this.destroyed = true;
+
+		for(const set_id of this.emote_sets._cache)
+			this.manager.emotes.unrefSet(set_id);
+	}
+
+	get id() {
+		return this._id;
+	}
+
+	get login() {
+		return this._login;
+	}
+
+	set login(val) {
+		if ( this._login === val )
+			return;
+
+		const obj = this.room || this.manager;
+
+		if ( this._login ) {
+			const old_user = obj.users[this._login];
+			if ( old_user === this )
+				obj.users[this._login] = null;
+		}
+
+		this._login = val;
+		if ( ! val )
+			return;
+
+		const old_user = obj.users[val];
+		if ( old_user && old_user !== this )
+			old_user.login = null;
+
+		obj.users[val] = this;
+	}
+
+
+	// ========================================================================
+	// Emote Sets
+	// ========================================================================
+
+	addSet(provider, set_id, data) {
+		if ( ! this.emote_sets.sourceIncludes(provider, set_id) ) {
+			this.emote_sets.push(provider, set_id);
+			this.manager.emotes.refSet(set_id);
+		}
+
+		if ( data )
+			this.manager.emotes.loadSetData(set_id, data);
+	}
+
+	removeSet(provider, set_id) {
+		if ( this.emote_sets.sourceIncludes(provider, set_id) ) {
+			this.emote_sets.remove(provider, set_id);
+			this.manager.emotes.unrefSet(set_id);
+		}
+	}
+}