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Re: Nitpicking the code (Was: Experiences with match() subexpressions?)

From Janis Papanagnou <janis_papanagnou+ng@hotmail.com>
Newsgroups comp.lang.awk
Subject Re: Nitpicking the code (Was: Experiences with match() subexpressions?)
Date 2025-04-14 20:53 +0200
Organization A noiseless patient Spider
Message-ID <vtjlif$1tmav$1@dont-email.me> (permalink)
References <vt7qlq$2ge70$1@dont-email.me> <vt7qs4$2gior$1@dont-email.me> <vt9q0n$70fm$1@dont-email.me> <vtgtkr$3br8e$1@dont-email.me> <vtjjlf$1ni8g$1@news.xmission.com>

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On 14.04.2025 20:20, Kenny McCormack wrote:
> In article <vtgtkr$3br8e$1@dont-email.me>,
> Ed Morton  <mortonspam@gmail.com> wrote:
> ...
>>     data = "R=\"R=r1,R=r2\",R=r2,R=r3,E=e"
>>     nf = patsplit(data, arr, /[RE]=([^,]*|"([^"]|"")*")/)
>>     delete arr
>>     for ( i in arr ) {
>>         sub(/[^=]+=/, "", arr[i])
>>     }
> 
> This can't be right, since if the sequence:
>     delete arr
>     for (i in arr) ...
> can't possibly do anything.  I.e., the for statement will be a no-op, since
> the array is empty at that point.
> 
>> or any awk:
>>
>>     data = "R=\"R=r1,R=r2\",R=r2,R=r3,E=e"
>>     nf = 0
>>     delete arr
>>     while ( match(data, /[RE]=([^,]*|"([^"]|"")*")/, a) ) {
>>         arr[++nf] = substr(data, RSTART+2, RLENGTH-2)
>>         data = substr(data, RSTART+RLENGTH)
>>     }
> 
> I believe "delete arr" (without an index, hence removing the entire array)
> is an "extension".  I can't quite quote chapter and verse, but I note that
> "man mawk" explicitly mentions that mawk supports this syntax, thereby
> implying that it isn't "standard".  Of course, gawk supports it as well.
> 
> So, if by "any awk", you mean "strictly standard", then, well, you can see
> where I am going with this.

I seem to recall that a standard way to clear an array could be using
  split("", arr)
for example. To my taste it looks a bit clumsy, not as nice as using
'delete', but well, whatever one prefers.

Janis

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Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-10 09:06 +0200
  Re: Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-10 09:09 +0200
    Re: Experiences with match() subexpressions? gazelle@shell.xmission.com (Kenny McCormack) - 2025-04-10 11:08 +0000
      Re: Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-10 13:55 +0200
        Re: Experiences with match() subexpressions? gazelle@shell.xmission.com (Kenny McCormack) - 2025-04-10 14:04 +0000
          Re: Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-10 23:39 +0200
            Re: Experiences with match() subexpressions? arnold@freefriends.org (Aharon Robbins) - 2025-04-11 06:33 +0000
              Re: Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-11 09:10 +0200
                Re: Experiences with match() subexpressions? Kaz Kylheku <643-408-1753@kylheku.com> - 2025-04-11 08:22 +0000
                Re: Experiences with match() subexpressions? Manuel Collado <mcollado2011@gmail.com> - 2025-04-18 12:03 +0200
                Re: Experiences with match() subexpressions? gazelle@shell.xmission.com (Kenny McCormack) - 2025-04-18 12:01 +0000
                Re: Experiences with match() subexpressions? Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-18 14:24 +0200
              Re: Experiences with match() subexpressions? Kaz Kylheku <643-408-1753@kylheku.com> - 2025-04-11 07:40 +0000
              The new matcher (Was: Experiences with match() subexpressions?) gazelle@shell.xmission.com (Kenny McCormack) - 2025-04-11 08:57 +0000
                Re: The new matcher (Was: Experiences with match() subexpressions?) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-11 15:50 +0200
              Re: Experiences with match() subexpressions? Kaz Kylheku <643-408-1753@kylheku.com> - 2025-04-11 17:54 +0000
    Re: Experiences with match() subexpressions? Ed Morton <mortonspam@gmail.com> - 2025-04-10 20:07 -0500
      Re: Experiences with match() subexpressions? Ed Morton <mortonspam@gmail.com> - 2025-04-13 12:52 -0500
        Nitpicking the code (Was: Experiences with match() subexpressions?) gazelle@shell.xmission.com (Kenny McCormack) - 2025-04-14 18:20 +0000
          Re: Nitpicking the code (Was: Experiences with match() subexpressions?) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-14 20:53 +0200
            Re: Nitpicking the code (Was: Experiences with match() subexpressions?) Ed Morton <mortonspam@gmail.com> - 2025-04-14 18:55 -0500
              Re: Nitpicking the code (Was: Experiences with match() subexpressions?) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-04-15 05:35 +0200

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