[plt-scheme] Syntax objects and strings (or "stupid infix tricks")

On Dec 7, 2006, at 12:46 PM, Corey Sweeney wrote:

> That works.   (eval `(infix ,(read-syntax `thingy1 (open-input- 
> string "(2 + 3)")))) does produce 5.
>
> Thanks
>
> For fun I decided to test it's generality, I tried:
>
> (read-syntax `thingy2 (open-input-string "((("))
>
> Which immedately complained about missmatched parenthisis. I don't  
> really need to do this, but do you know what one would one do if  
> they needed to parse a language that didn't use parenthisis  
> charactors in the traditional maner?

You'd probably want to use a traditional parser.  One such parser is  
Scott Owens' parser-tools package, which (IIRC) is a part of the  
standard DrScheme distribution.

HTH,

John Clements


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