Re: [vile] Possible bug in vile-perl-filter

[Thomas Dickey]

On Mon, Feb 11, 2008 at 12:44:55PM +0100, Paul van Tilburg wrote:
> On Fri, Feb 08, 2008 at 05:53:02PM -0500, Steven Lembark wrote:
> > 
> > Looking at the screen in 9.6d, using the stock
> > vile perl filter:
> 
> While, we're at it, it seems that the tex/latex filter has
> an issue with the \} command in a math environment, e.g.:
>   \foo{$\{a, b\}$}.
> 
> Now, mathmode will run till the end of the document unless
> you put a space after the b?

I see - it's not detecting the "\}" as an escaped brace, and then it
decrements the brace-count, allowing the second "$" to be treated as
outside-braces and thus the start of math-mode.

Using flex's debug-mode, I see the problem; it's an incorrect pattern.
The "-" (see diff) should be last, to make it a literal character
rather than expressing a range.

I'll have to study my test-cases, but for your example this fix seems
to be all that's needed:

diff -u -r1.47 latexflt.l
--- latexflt.l  2008/01/22 01:47:02     1.47
+++ latexflt.l  2008/02/12 01:38:17
@@ -79,7 +79,7 @@
 
 NAME           [[:alpha:address@hidden
 NONNAME                [^[:alpha:address@hidden
-MIXED_ALNUM    ({NAME}[[:digit:].-_]+)+{NAME}?
+MIXED_ALNUM    ({NAME}[[:digit:]._-]+)+{NAME}?
 
 OCTAL          \'[0-7]+
 DECIMAL                [[:digit:]]+


-- 
Thomas E. Dickey <address@hidden>
http://invisible-island.net
ftp://invisible-island.net

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