aop.js

gistfile1.js

var AOP = {
  addBefore : function(obj, fname, before) {
    var oldFunc = obj[fname];
    obj[fname] = function() {
      before(true, arguments, obj);
      return oldFunc.apply(this,arguments);
    };
  },
  addAfter : function(obj, fname, after) {
    var oldFunc = obj[fname];
    obj[fname] = function() {
      result = oldFunc.apply(this, arguments);
      try{
        return result;
      } finally{
        after(result, arguments, obj);
      }
    };
  },
  addAround : function(obj, fname, around) {
    var oldFunc = obj[fname];
    obj[fname] = function(args) {
      return around(arguments, obj,
          function(){
            return oldFunc.apply(this, obj[fname].arguments);
          }
      );
    };
  },
  isPattern : function (re, funcName) {
    return (re.exec(funcName)!=null);
  },
  addPattern : function(obj, pattern, oldfn, advisor){
    var re = new RegExp(pattern);
    for(var o in obj){
      if(typeof(obj[o])!="function") continue;
      if(this.isPattern(re, o)){
        advisor.call(this, obj, o, oldfn);
      }
    }
  },
  addBeforePattern : function(obj, pattern, before){
    this.addPattern(obj, pattern, before, this.addBefore);
  },
  addAfterPattern : function(obj, pattern, before){
    this.addPattern(obj, pattern, before, this.addAfter);
  },
  addAroundPattern : function(obj, pattern, before){
    this.addPattern(obj, pattern, before, this.addAround);
  }
};