Re: Changing the Emacs engine to Guile

[Cecil Westerhof <Cecil@decebal.nl>]

Op dinsdag 22 jun 2010 19:28 CEST schreef Pascal J. Bourguignon:

>>> this (while (re-search-forward ...)) loop modifies the line for each
>>> occurence of the regexp, replacing it with (substring substitute-str 0
>>> match-length), which is a different replacement string in general.
>>
>> Why? I would think the replacement string is the same. (When using
>> single byte characters.)
>
> With:
>
> substitute-str = "Abcdef" ; initally
> start-match    =  4
> end-match      = 12
> match-length   =  8
>
>
> substitute-str will become "AbcdefAbcdef",
> and   (substring substitute-str 0 match-length)        = "AbcdefAb"
> while (substring substitute-str start-match end-match) = "efAbcdef"

I made a stupid mistake. It did not show because I only changed a
substring at the start of the line. Better code is at:
    http://www.decebal.nl/guile/sources/substituteExpression.scm

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof