Re: {{ double braces }}

["Thomas A. Schmitz" <thomas.schmitz@uni-bonn.de>]

Hi Aditya,

now I need to apologize for being so slow to reply: thanks a lot, this  
looks really fascinating! I don't know how many things I've read on  
the web to understand if regexps can handle nested delimiters or not  
(I think the long and short of it was that on some mathematical  
principle it just isn't possible); there is some pretty obscure perl  
stuff that might be able to do it but is highly experimental. If gema  
really can do this, it should be a godsend for processing TeX files. I  
have it installed now on my OS X box (but couldn't build the gel  
binary) and am looking forward to experimenting with it.

All best, and thanks!

Thomas

On Feb 6, 2008, at 8:01 AM, Aditya Mahajan wrote:

> Nested patterns is something where gema really excels. Here is a gema
> script to convert \footnote{{something}} to \footnote{something}
>
> :\\footnote\W\{\{<matchbrace>\}\}=\\footnote\{$1\}
> matchbrace:\{#\}=\{#\}
> matchbrace:\\<Y1>=\\$1
>
> Save it as footnote.gema and then run
>
> gema -f footnote.gema tex-file > output-file
>
> It handles these expressions correctly:
>
> \footnote{{This $\frac{a}{b^{c+d}}$ is a strange footnote}}
>
> \footnote{{This $\frac{a}{b^{c+d}}$ is a strange footnote with  
> multiple {nested
> {expressions}}}}
>
> \footnote{{This $\frac{\left[\frac {a}{b}\right\}}{c}$ is a strange
> footnote}}
>
> It is much easier to write than regular expressions. Unfortunately,  
> gema
> expressions can be as hard as regular expressions to read.
>
> Aditya

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