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33 lines
761 B
JavaScript
33 lines
761 B
JavaScript
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// On event emitter generic javascript utility.
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module.exports = function onto(tag, arg, as){
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if(!tag){ return {to: onto} }
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var tag = (this.tag || (this.tag = {}))[tag] ||
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(this.tag[tag] = {tag: tag, to: onto._ = {
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next: function(){}
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}});
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if(arg instanceof Function){
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var be = {
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off: onto.off ||
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(onto.off = function(){
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if(this.next === onto._.next){ return !0 }
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if(this === this.the.last){
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this.the.last = this.back;
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}
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this.to.back = this.back;
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this.next = onto._.next;
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this.back.to = this.to;
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}),
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to: onto._,
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next: arg,
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the: tag,
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on: this,
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as: as,
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};
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(be.back = tag.last || tag).to = be;
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return tag.last = be;
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}
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(tag = tag.to).next(arg);
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return tag;
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};
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