Parsing [AS3]

[FiqStudios]

I'm working on a calculator in flash (advanced) and I've already defined functions. Now all that's left for me to do is to get flash to execute functions typed by the user, for example, If input.text = "riemann_zeta(8.5)" how will I get flash to treat it as a function and execute it?

[CaptinChu]

Check out the indexof() function on strings. That will help a lot. indexof() finds where the first instance of a substring is within a string if that substring is in there. I believe it will help you.

Please PM me about the Riemann Zeta function. I've been very intrigued about it for a while. Also, tell me how the calculator turns out when it's all said and done.

[FiqStudios]

At 11/12/08 10:25 PM, CaptinChu wrote: Check out the indexof() function on strings. That will help a lot. indexof() finds where the first instance of a substring is within a string if that substring is in there. I believe it will help you.

Not really helpful. Any better ideas?

[GustTheASGuy]

Actionscript is compiled. You can't treat strings as code. Use regexps to tokenize the string and parse the tokens.

[Cojones893]

You can do something like:

function test(n:String):String{
	return n;
}

trace(this["test"]("test function"));

[DougyTheFreshmaker]

At 11/12/08 10:08 PM, FiqStudios wrote: I'm working on a calculator in flash (advanced) and I've already defined functions. Now all that's left for me to do is to get flash to execute functions typed by the user, for example, If input.text = "riemann_zeta(8.5)" how will I get flash to treat it as a function and execute it?

Unfortunately, I don't think this is going to be as easy as you might expect. What you need to do is write a compiler, sans the code generation portion. If you don't know them already, looking into finite state and push-down automata would be a good place to start, along with any other compiler theory resources you could find.

[FiqStudios]

At 11/13/08 10:35 AM, Cojones893 wrote: You can do something like:

function test(n:String):String{
return n;
}

trace(this["test"]("test function"));

Thanks a lot, that really helped.

I'll post the final when it's done. It's got a lot of upper level functions, it'll even have a base changer ( 5 = 101 base 2).