On 14.04.2025 20:20, Kenny McCormack wrote:

In article <vtgtkr$3br8e$[email protected]>,
Ed Morton <[email protected]> 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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In article <vtgtkr$3br8e$[email protected]>,
Ed Morton <[email protected]> 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.

--
"Only a genius could lose a billion dollars running a casino."
"You know what they say: the house always loses."
"When life gives you lemons, don't pay taxes."
"Grab 'em by the p***y!"

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On 15.04.2025 01:55, Ed Morton wrote:

In all seriousness if anyone is using an awk that doesn't support
`delete arr` then they need to get a new awk as who knows what other
features it might be lacking.

One nice property of Awk was that for decades its powerful features
and its kernel functionality persisted and fancy features were not
necessary to make good use of that tool.

Janis

Ed.

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