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pingu.js
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pingu.js
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/*
Pingu is a disk-persisted fixed-length fifo buffer. Schnoo schnoo.
*/
function Pingu(max_size, name){
this.space_name = "YUNG_GIF_"+name;
this.max_size = max_size;
this.lst = (localStorage[this.space_name] == undefined ? [] : JSON.parse(localStorage[this.space_name]));
this.length = this.lst.length;
}
// Array(-like) methods
Pingu.prototype.unshift = function(e){
if(this.lst.length >= this.max_size){
this.lst.pop();
}
this.lst.unshift(e);
this.length = this.lst.length;
localStorage[this.space_name] = JSON.stringify(this.lst);
};
Pingu.prototype.pop = function(){
e = this.lst.pop();
this.length = this.lst.length;
localStorage[this.space_name] = JSON.stringify(this.lst);
return e;
};
Pingu.prototype.concat = function(e){
return this.lst.concat(e.lst);
};
Pingu.prototype.resize = function(){
if(this.lst.length > this.max_size){
this.lst = this.lst.slice(0, this.max_size-1);
this.length = this.lst.length;
localStorage[this.space_name] = JSON.stringify(this.lst);
}
};