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import Is from '../strong-type/index.js';
const is=new Is;
class EventPubSub {
constructor() {
}
on(type, handler, once=false) {
is.string(type);
is.function(handler);
is.boolean(once);
if(type=='*'){
type=this.#all;
}
if (!this.#events[type]) {
this.#events[type] = [];
}
handler[this.#once] = once;
this.#events[type].push(handler);
return this;
}
once(type, handler) {
//sugar for this.on with once set to true
//so let that do the validation
return this.on(type,handler,true);
}
off(type='*', handler='*') {
is.string(type);
if(type==this.#all.toString()||type=='*'){
type=this.#all;
}
if (!this.#events[type]) {
return this;
}
if (handler=='*') {
delete this.#events[type];
return this;
}
//If we are not removing all the handlers,
//we need to know which one we are removing.
is.function(handler);
const handlers = this.#events[type];
while (handlers.includes(handler)) {
handlers.splice(
handlers.indexOf( handler ),
1
);
}
if (handlers.length < 1) {
delete this.#events[type];
}
return this;
}
emit(type, ...args) {
is.string(type);
const globalHandlers=this.#events[this.#all]||[];
this.#handleOnce(this.#all.toString(), globalHandlers, type, ...args);
if (!this.#events[type]) {
return this;
}
const handlers = this.#events[type];
this.#handleOnce(type, handlers, ...args);
return this;
}
reset(){
this.off(this.#all.toString());
for(let type in this.#events){
this.off(type);
}
return this
}
get list(){
return Object.assign({},this.#events);
}
#handleOnce=(type, handlers, ...args)=>{
is.string(type);
is.array(handlers);
const deleteOnceHandled=[];
for (let handler of handlers) {
handler(...args);
if(handler[this.#once]){
deleteOnceHandled.push(handler);
}
}
for(let handler of deleteOnceHandled){
this.off(type,handler);
}
}
#all =Symbol.for('event-pubsub-all')
#once=Symbol.for('event-pubsub-once')
#events={}
}
export {EventPubSub as default, EventPubSub}; |