Simple math expression evaluator

[paul_nicholls]

Ewww... Crenshaw Compilers.... Gotta love em!

LOL!

When I started looking at compiler theory and started working on my own languages I started with Crenshaws work too.

A step up from this is to build a FORTH style compiler and use a basic stack to handle the manipulations. This quickly leads you into basic variables with local, global, and static (constants) visibility.

I have already done a pascal-like scripting language complete with 'op-codes' + virtual machine, and a "compiler" for a virtual computer called "RetroBox" (http://www.retrogamedev.org/retrobox...oBoxProjec.php) using his work

It is lots of fun

Then you can move into optimizers, dynamic lexers, virtual machine implementation, and all the other fun things that come with compilers/theory.

My first attempt at something like this was "TSimpleMath" I still have it on my website at http://eonclash.com/ViewProduct.php?ProductID=9 if you want something for comparison. I'd do it completely different today, but it works well and I haven't seen a need to rewrite it

Thanks
I might take a look at it

- Jeremy

PS: I've spent a LOT of time doing things like this when you get stuck, there is a reason the best book on the subject is call "The Dragon Book".

I've heard of it of course, but never seen it myself

cheers,
Paul