Re: [Nano-devel] aggressive C color highlighting

[delta]

On Thu, 3 Aug 2006 09:09:07 -0700 (PDT)
"John M. Gabriele" <address@hidden> wrote:

> I think that overlaps should be allowed only when the outer match
> totally encompasses the inner match:
> 
>     match1_start       match2_start    match2_end        match1_end
>                             \---------------/
>          \----------------------------------------------------/
> 
> but not when they only partially overlap:
> 
>     match1_start       match2_start    match1_end        match2_end
>          \----------------------------------/
>                              \--------------------------------/

I already have this implemented in an patch to 1.3.0. There were a few bugs 
with some additional features that kept me from releasing it and I lost my free 
time before resolving them. I will try to port the code sans buggy features to 
the latest source and post it here.

--

Nano colorizes every match on the screen before moving on to the next 
expression. Match overlap removal can be handled using two different methods.

1) Apply all expressions to the current character pointer and increment to the 
end of the match or to the next character when there is no match. This method 
is quite simple and will give a significant speed boost.

2) Use the same technique as in the first method but store all matches in a 
list and colorize the text using the list. The list must be rebuilt each time 
the file is modified. This method uses more memory to store the list but gives 
a huge speed increase when only viewing a file and no loss in speed compared to 
the first method.

A force-color directive is required to always apply certain expressions such as 
those that highlight whitespace at the end of lines.

Once this code is in place it becomes easy to apply sets of expressions to 
matches.

    # color bar when found after foo
    color red "foo "
    {
        next-color blue "bar"
    }

    # color php code inside an html file
    color begin="^<?php" end="^?>"
    {
       include "php.nanorc"
    }


-- 
Brand Huntsman -- http://www.qzx.com
Gentoo Linux 2.6.14.2-k7 [AMD Athlon 64 3000+ @ 1299MHz]
up 29 days 23:13 hours