.../Base.js at master · Erla14/... · GitHub

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/*
	Base.js, version 1.1a
	Copyright 2006-2010, Dean Edwards
	License: http://www.opensource.org/licenses/mit-license.php
*/

varBase=function(){
// dummy
};

Base.extend=function(_instance,_static){// subclass
varextend=Base.prototype.extend;

// build the prototype
Base._prototyping=true;
varproto=newthis;
extend.call(proto,_instance);
proto.base=function(){
// call this method from any other method to invoke that method's ancestor
};
deleteBase._prototyping;

// create the wrapper for the constructor function
//var constructor = proto.constructor.valueOf(); //-dean
varconstructor=proto.constructor;
varklass=proto.constructor=function(){
if(!Base._prototyping){
if(this._constructing||this.constructor==klass){// instantiation
this._constructing=true;
constructor.apply(this,arguments);
deletethis._constructing;
}elseif(arguments[0]!=null){// casting
return(arguments[0].extend||extend).call(arguments[0],proto);
}
}
};

// build the class interface
klass.ancestor=this;
klass.extend=this.extend;
klass.forEach=this.forEach;
klass.implement=this.implement;
klass.prototype=proto;
klass.toString=this.toString;
klass.valueOf=function(type){
//return (type == "object") ? klass : constructor; //-dean
return(type=="object") ? klass : constructor.valueOf();
};
extend.call(klass,_static);
// class initialisation
if(typeofklass.init=="function")klass.init();
returnklass;
};

Base.prototype={
extend: function(source,value){
if(arguments.length>1){// extending with a name/value pair
varancestor=this[source];
if(ancestor&&(typeofvalue=="function")&&// overriding a method?
// the valueOf() comparison is to avoid circular references
(!ancestor.valueOf||ancestor.valueOf()!=value.valueOf())&&
/\bbase\b/.test(value)){
// get the underlying method
varmethod=value.valueOf();
// override
value=function(){
varprevious=this.base||Base.prototype.base;
this.base=ancestor;
varreturnValue=method.apply(this,arguments);
this.base=previous;
returnreturnValue;
};
// point to the underlying method
value.valueOf=function(type){
return(type=="object") ? value : method;
};
value.toString=Base.toString;
}
this[source]=value;
}elseif(source){// extending with an object literal
varextend=Base.prototype.extend;
// if this object has a customised extend method then use it
if(!Base._prototyping&&typeofthis!="function"){
extend=this.extend||extend;
}
varproto={toSource: null};
// do the "toString" and other methods manually
varhidden=["constructor","toString","valueOf"];
// if we are prototyping then include the constructor
vari=Base._prototyping ? 0 : 1;
while(key=hidden[i++]){
if(source[key]!=proto[key]){
extend.call(this,key,source[key]);

}
}
// copy each of the source object's properties to this object
for(varkeyinsource){
if(!proto[key])extend.call(this,key,source[key]);
}
}
returnthis;
}
};

// initialise
Base=Base.extend({
constructor: function(){
this.extend(arguments[0]);
}
},{
ancestor: Object,
version: "1.1",

forEach: function(object,block,context){
for(varkeyinobject){
if(this.prototype[key]===undefined){
block.call(context,object[key],key,object);
}
}
},

implement: function(){
for(vari=0;i<arguments.length;i++){
if(typeofarguments[i]=="function"){
// if it's a function, call it
arguments[i](this.prototype);
}else{
// add the interface using the extend method
this.prototype.extend(arguments[i]);
}
}
returnthis;
},

toString: function(){
returnString(this.valueOf());
}
});