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function notice () {
function Notice () {
let
scroll = {'*':[]} // General events with their subscribers
, scrollOnce = {} // Single events with their subscribers
, ignore = [] // Ignore event names ( general and single )
, debugFlag = false
, debugHeader = ''
;
function on ( e, fn ) {
if ( !scroll[e] ) scroll[e] = []
scroll[e].push ( fn )
} // on func.
function once ( e, fn ) {
if ( e === '*' ) return // The wildcard '*' doesn't work for 'once' events
if ( !scrollOnce[e] ) scrollOnce[e] = []
scrollOnce[e].push ( fn )
} // once func.
function off ( e, fx ) {
if ( fx ) { // fx is optional
if ( scroll[e] ) scroll[e] = scroll[e].filter ( fn => fn !== fx )
if ( scrollOnce[e] ) scrollOnce[e] = scrollOnce[e].filter ( fn => fn !== fx )
if ( scroll[e] && scroll[e].length === 0 ) delete scroll[e]
if ( scrollOnce[e] && scrollOnce[e].length === 0 ) delete scroll[e]
return
}
if ( scrollOnce[e] ) delete scrollOnce[e]
if ( scroll[e] ) delete scroll[e]
} // off func.
function reset () {
scroll = {'*':[]}
scrollOnce = {}
ignore = []
} // reset func.
function debug ( val, header ) {
debugFlag = val ? true : false
if ( header && (typeof header === 'string') ) debugHeader = header
} // debug func.
function emit () {
const [ e, ...args ] = arguments
if ( debugFlag ) {
console.log ( `${debugHeader} Event "${e}" was triggered.`)
if ( args.length > 0 ) {
console.log ( 'Arguments:')
console.log ( ...args )
console.log ( '^----' )
}
}
function exeCallback ( name ) {
let stopped = false;
if ( name === '*' ) return
if ( ignore.includes(name) ) return
scroll[name].every ( fn => {
const r = fn ( ...args );
if ( typeof(r) !== 'string' ) return true
if ( r.toUpperCase() === 'STOP' ) {
stopped = true
return false
}
return true
})
if ( !stopped ) scroll['*'].forEach ( fn => fn(e,...args) )
} // exeCallback func.
if ( e === '*' ) { // The wildcard '*' doesn't work for 'once' events
let evNames = Object.keys ( scroll )
evNames.forEach ( name => exeCallback(name) )
return
}
if ( scrollOnce[e] ) {
if ( ignore.includes(e) ) return
scrollOnce[e].forEach ( fn => fn(...args) )
delete scrollOnce[e]
}
if ( scroll[e] ) {
exeCallback ( e )
}
} // emit func.
function start ( e ) {
if ( e === '*' ) {
ignore = []
return
}
ignore = ignore.filter ( type => e != type )
} // start func.
function stop ( e ) {
if ( e === '*' ) {
const
evNames = Object.keys ( scroll )
, evOnceNames = Object.keys ( scrollOnce )
;
ignore = [ ...evOnceNames, ...evNames ]
return
}
ignore.push ( e )
} // stop func.
return {
on // Register a event
, once // Register a single event
, off // Unregister regular and single events
, reset // Unregister all events
, emit // Trigger a event
, stop // Ignore event for a while
, start // Remove event from ignore list
, debug
}
} // notice fn.
return Notice ()
}
export default notice
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