Inject AS3 or ABC to a swf file in runtime? - actionscript-3

Question

I've been seeing some tools for a browsergame that injects code to a swf file in order to automate some parts of the game.
I've been reading about swf flash format and I'm still don't knowing how that's possible, maybe the program runs the swf file with a custom flash player?
If you could guide me in this I would be very appreciated, this is very interesting.

Answer 1

Just a try:
var actionString:String = "methodAddOne";
var paramString:String = "1";
function methodAddOne(num:String):void{
trace(Number(num)+1);
}
this[actionString](paramString); //trace: 2
For a queue of params:
var actionString2:String="methodAdd";
var paramString2:String="1,2,3,-6";
function methodAdd(nums:String):void{
var params:Array= nums.split(",");
var out=0;
for each(var num:Number in params){
out += num;
}
trace(out);
}
this[actionString2](paramString2);// returns 0
All calculations, core-Methods,... you have to parse. Very complicated...
E.g. try to parse and calculate "1+2+3-6". Its possible of course, but hard to do with other Stuff and math-grammar.
So, the easier way is to provide a String-based Api with all methods, the
user can predefined use with params.
like this:
var stackString:String = "methodAddOne(100); methodAdd(1,2,3);";
function parseFunctionsString(str:String):void
{
//better use regExp at all the following
var f:String = str.substring(0,str.indexOf("("));
var p:String = str.substring(str.indexOf("(") + 1,str.indexOf(")"));
// clean spaces // also better regExp to validate some other user mistakes - just for this test in this way
f = f.replace(" ","");
p = p.replace(" ","");
//trace("** "+f+" ("+p+")");
if (this[f])
{
this[f](p);
}
else
{
trace("unknown function: "+f);
}
str = str.substr(str.indexOf(";") + 1,str.length - str.indexOf(";") + 1);
if (str.length > 2)
{
parseFunctionsString(str);
}
}
parseFunctionsString(stackString);
// trace:
// 101
// 6
As an idea... Greetings André