プロトタイプベースOOP試作その1

gistfile1.js

Object.prototype.mix = function() {
    var obj = arguments,
        propList = [];

    // Objectの独自拡張メソッドは追加しない
    for (var pprop in Object.prototype) {
        propList.push(pprop);
    }

    // Object拡張したプロパティに該当すればtrue
    var contains = function(value) {
        for (var i in propList) {
            if (propList.hasOwnProperty(i) && propList[i] === value) {
                return true;
            }
        }
        return false;
    };
    
    var clone = function(o) {
        var copy = {};
        for (prop in o) if (!contains(prop)) {
           copy[prop] = o[prop];
        }
        return copy;
        
    };
    
    if (!(!!document.attachEvent) && !Object.prototype.hasOwnProperty("parent")) {
        Object.prototype.parent = function() { return this.__proto__; };
    }
    
    child = clone(this);

    // for IE
    if (!!document.attachEvent) {
        for (var i = 0, len = obj.length; i < len; i++) {
            var o = obj[i];
            for (prop in o) if (!contains(prop)) {
                child[prop] = o[prop];
            }
        }
    }
    // for Modern Browsers
    else {
        for (var i = 0, len = obj.length; i < len; i++) {
            var parent = {};
            var o = obj[i];
            for (var prop in o) if (!contains(prop)) {
                parent[prop] = o[prop];
            }
            
            // __proto__の深さを探索する
            var depth = 0, _c = child;
            for (;;) {
                _c = _c.__proto__;
                if (_c !== null) {
                    depth++;
                }
                else {
                    break;
                }
            }
            
            // 一番上の親を辿り__proto__にオブジェクトを連結する
            var plist = ["child"];
            for (var d = 1; d <= depth; d++) {
                plist[d] = "__proto__";
            };
            eval(plist.join(".") + " = parent");
        }
    }

    return child;
};