[Tutor] Syntax Check

[Ryan Davis]

Check out COG (http://www.nedbatchelder.com/code/cog/), a macro system for any language created by Ned Batchelder
(http://www.nedbatchelder.com/).

I'm not sure if that's what you're looking for, but allows some good macro capabilities.

Thanks,
Ryan 

-----Original Message-----
From: tutor-bounces at python.org [mailto:tutor-bounces at python.org] On Behalf Of Jeff Shannon
Sent: Thursday, January 27, 2005 4:35 PM
To: tutor at python.org
Subject: Re: [Tutor] Syntax Check

Chad Crabtree wrote:

> I'm trying to make a macro system that's work by just doing this
> 
> import macro
> # [...]

Perhaps you could turn things around, and make your macro preprocessor 
into an import hook?  I.E., you'd use it like --

     import macro
     module = macro.import("module_with_macros"[, macro_list])
     module.do_stuff()

Not sure if you'd need to have a list of macros in the module to be 
imported, or not.  Perhaps the macro module would hold a list of 
currently active macros, instead...

In any case, this (I think) gives you a chance to interrupt the import 
process and modify the target module before the Python parser gets it, 
which should enable you to avoid the SyntaxError problems.

(Of course, I've never messed around with hooking __import__(), so I 
could just be talking out of my ...)

Jeff Shannon
Technician/Programmer
Credit International


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