/*

    Base.js, version 1.1a

    Copyright 2006-2010, Dean Edwards

    License: http://www.opensource.org/licenses/mit-license.php

*/

var Base = function() {

    // dummy

};

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

    var extend = Base.prototype.extend;

    // build the prototype

    Base._prototyping = true;

    var proto = new this;

    extend.call(proto, _instance);

  proto.base = function() {

    // call this method from any other method to invoke that method's ancestor

  };

    delete Base._prototyping;

    // create the wrapper for the constructor function

    //var constructor = proto.constructor.valueOf(); //-dean

    var constructor = proto.constructor;

    var klass = proto.constructor = function() {

        if (!Base._prototyping) {

            if (this._constructing || this.constructor == klass) { // instantiation

                this._constructing = true;

                constructor.apply(this, arguments);

                delete this._constructing;

            } else if (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 (typeof klass.init == "function") klass.init();

    return klass;

};

Base.prototype = {

    extend: function(source, value) {

        if (arguments.length > 1) { // extending with a name/value pair

            var ancestor = this[source];

            if (ancestor && (typeof value == "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

                var method = value.valueOf();

                // override

                value = function() {

                    var previous = this.base || Base.prototype.base;

                    this.base = ancestor;

                    var returnValue = method.apply(this, arguments);

                    this.base = previous;

                    return returnValue;

                };

                // point to the underlying method

                value.valueOf = function(type) {

                    return (type == "object") ? value : method;

                };

                value.toString = Base.toString;

            }

            this[source] = value;

        } else if (source) { // extending with an object literal

            var extend = Base.prototype.extend;

            // if this object has a customised extend method then use it

            if (!Base._prototyping && typeof this != "function") {

                extend = this.extend || extend;

            }

            var proto = {toSource: null};

            // do the "toString" and other methods manually

            var hidden = ["constructor", "toString", "valueOf"];

            // if we are prototyping then include the constructor

            var i = 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 (var key in source) {

                if (!proto[key]) extend.call(this, key, source[key]);

            }

        }

        return this;

    }

};

// initialise

Base = Base.extend({

    constructor: function() {

        this.extend(arguments[0]);

    }

}, {

    ancestor: Object,

    version: "1.1",

    forEach: function(object, block, context) {

        for (var key in object) {

            if (this.prototype[key] === undefined) {

                block.call(context, object[key], key, object);

            }

        }

    },

    implement: function() {

        for (var i = 0; i < arguments.length; i++) {

            if (typeof arguments[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]);

            }

        }

        return this;

    },

    toString: function() {

        return String(this.valueOf());

    }

});