100 lines
2.2 KiB
JavaScript
100 lines
2.2 KiB
JavaScript
'use strict';
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class EventPubSub {
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constructor( scope ) {
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this._events_ = {};
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this.publish = this.trigger = this.emit;
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this.subscribe = this.on;
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this.unSubscribe = this.off;
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}
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on( type, handler, once ) {
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if ( !handler ) {
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throw new ReferenceError( 'handler not defined.' );
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}
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if ( !this._events_[ type ] ) {
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this._events_[ type ] = [];
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}
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if(once){
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handler._once_ = once;
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}
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this._events_[ type ].push( handler );
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return this;
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}
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once( type, handler ) {
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return this.on( type, handler, true );
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}
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off( type, handler ) {
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if ( !this._events_[ type ] ) {
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return this;
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}
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if ( !handler ) {
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throw new ReferenceError( 'handler not defined. if you wish to remove all handlers from the event please pass "*" as the handler' );
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}
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if ( handler == '*' ) {
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delete this._events_[ type ];
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return this;
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}
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const handlers = this._events_[ type ];
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while ( handlers.includes( handler ) ) {
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handlers.splice(
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handlers.indexOf( handler ),
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1
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);
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}
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if ( handlers.length < 1 ) {
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delete this._events_[ type ];
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}
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return this;
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}
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emit( type, ...args ) {
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if ( !this._events_[ type ] ) {
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return this.emit$( type, ...args );
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}
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const handlers = this._events_[ type ];
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const onceHandled=[];
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for ( let handler of handlers ) {
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handler.apply( this, args );
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if(handler._once_){
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onceHandled.push(handler);
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}
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}
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for(let handler of onceHandled){
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this.off(type,handler);
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}
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return this.emit$( type, ...args );
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}
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emit$( type, ...args ) {
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if ( !this._events_[ '*' ] ) {
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return this;
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}
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const catchAll = this._events_[ '*' ];
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for ( let handler of catchAll ) {
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handler.call( this, type, ...args );
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}
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return this;
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}
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}
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module.exports = EventPubSub;
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