cor-lang/src/class.js

The Language of the Web

(function(cor){

/*
A library to provide some OO features across
Cor source code


Usage:
var
Class = cor.Class;

var A = Class({
    init: function(){
        this.xx = true;
        this.y()
    },

    y: function(){
        console.log('A')
    }
})

var B = Class(A, {
    y: function(){
        this.base('y')
        console.log('B')
    }
})


var C = Class(B, {
    y: function(){
        this.base('y')
        console.log('C')
    }
})

c = new C()
c;
*/


var
hasProp = Object.prototype.hasOwnProperty;

function Class(Base, classBody){
    if (! classBody){
        classBody = Base || {};
        Base      = function(){};
    }

    var
    key, member,
    base  = newBaseMethod(),
    Class = newClass(),
    proto = Object.create(Base.prototype);

    for (key in classBody) {
        if (! hasProp.call(classBody, key)){
            continue;
        }
        member = classBody[key];
        if (typeof member === 'function') {
            member.$owner = Class;
        }
        proto[key] = classBody[key];
    }

    proto._base_    = Base;
    proto.base      = base;
    Class.prototype = proto;

    return Class;
};


function newClass() {
    return function() {
        (typeof this.init === 'function') && this.init.apply(this, arguments);
    };
}

function newBaseMethod() {
    return function base(methodName, args){
        var
        callerMethod = this.base.caller,
        meth = callerMethod.$owner.prototype._base_.prototype[methodName];

        if (typeof meth === 'function') {
            return meth.apply(this, args);
        }
        throw "Can not find the base method '" + methodName + "'";
    };
}

cor.Class = Class;

})(typeof cor === 'undefined' ? {} : cor);