refactor: remove tjaf dependency; add local TJA parser

public/src/js/idb.js

@@ -0,0 +1,54 @@
+class IDB{
+	constructor(...args){
+		this.init(...args)
+	}
+	init(name, store){
+		this.name = name
+		this.store = store
+	}
+	start(){
+		if(this.db){
+			return Promise.resolve(this.db)
+		}
+		var request = indexedDB.open(this.name)
+		request.onupgradeneeded = event => {
+			var db = event.target.result
+			db.createObjectStore(this.store)
+		}
+		return this.promise(request).then(result => {
+			this.db = result
+			return this.db
+		}, target =>
+			console.warn("DB error", target)
+		)
+	}
+	promise(request){
+		return new Promise((resolve, reject) => {
+			return pageEvents.race(request, "success", "error").then(response => {
+				if(response.type === "success"){
+					return resolve(event.target.result)
+				}else{
+					return reject(event.target)
+				}
+			})
+		})
+	}
+	transaction(method, ...args){
+		return this.start().then(db =>
+			db.transaction(this.store, "readwrite").objectStore(this.store)[method](...args)
+		).then(this.promise.bind(this))
+	}
+	getItem(name){
+		return this.transaction("get", name)
+	}
+	setItem(name, value){
+		return this.transaction("put", value, name)
+	}
+	removeItem(name){
+		return this.transaction("delete", name)
+	}
+	removeDB(){
+		delete this.db
+		return indexedDB.deleteDatabase(this.name)
+	}
+}