Posted By

straps on 07/22/09

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Last Edited at 07/22/09 03:25am

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Object Runtime Fields Evaluator

/ Published in: JavaScript

Runtime Object Evaluator; search for string object properties that start with !! and eval the content.
Very useful if you want to load JSON from file and evaluate its fields on effective usage or access global variables at runtime.
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/**
 * Usage:
 * var o={a:1, b:'!! 1+1', c:'!! alert(\'c\')'};
 * evalObj(o);
 * //o.a===1
 * //o.b===2
 * //o.c() will display an alert
 * 
 * Updated to keep the scope, usage:
 * var o={a:1, b:'!! this.a+1', c:'!! alert(this.b+1)'};
 * evalObj.call(o,o);
 * //o.a===1
 * //o.b===2
 * //o.c() will display an alert with 3
 * 
*/
 
function evalObj(o,rec){
    if (rec === undefined) {
        rec=true;
    }
    for (var name in o){
        var elem=o[name];
        if (elem){
            var telem=typeof elem;
            if (telem==='string' && /^!!/.test(elem)){
                o[name]=new Function('return '+elem.substr(2)).call(this);
            }else if (rec && telem==='object'){
                evalObj.call(this,elem,rec);
            }
        }
    }
    return o;
}