Re: Re: Re: SLang tab completion - update 2002-08-05

["John E. Davis" <davis>]

Paul <p.boekholt@xxxxxxxxx> wrote:
>I'm using S-lang 1.4.0 and I don't have a strreplace(). I do have a
>str_replace() and a str_replace_all(). What does strreplace do and how do I
>implement it in S-lang?

Currently str_replace_all is a wrapper around strreplace, if it is
defined; otherwise it will fall back on str_replace.  See site.sl for
its definition.

If str_replace uses str_replace_all as it does in your case, then can
fail to do the right thing in some situations.  For example, consider
the replacement of "/" in "/a/b/c" with "/x" to produce "/xa/xb/xc".
You should find that str_replace_all using str_replace will loop
continuously with an eventual memory allocation error producing 
"/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.....xa/b/c".  The strreplace
function was created to fix this problem.

Since I just arrived from my vacation, I do not have time now to think
about a slang implementation of strreplace for your.  However, here is
a description of the strreplace function for you or some other person
if you want to take shot at an implementation.  Good luck, --John

strreplace

 SYNOPSIS
   Replace one or more substrings

 USAGE
   (new, n) = strreplace (a, b, c, max_n)

      String_Type a, b, c, rep;
      Int_Type n, max_n;


 DESCRIPTION
   The `strreplace' function may be used to replace one or more
   occurances of `b' in `a' with `c'.  If the integer
   `max_n' is positive, then the first `max_n' occurances of
   `b' in `a' will be replaced.  Otherwise, if `max_n' is
   negative, then the last `abs(max_n)' occurances will be replaced.
   
   The function returns the resulting string and an integer indicating
   how many replacements were made.

 EXAMPLE
   The following function illustrates how `strreplace' may be used
   to remove all occurances of a specified substring

     define delete_substrings (a, b)
     {
        (a, ) = strreplace (a, b, "", strlen (a));
        return a;
     }


 SEE ALSO
   is_substr, strsub, strtrim, strtrans, str_delete_chars
[Obtained from file /usr/local/doc/slang/slangfun.txt]
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