Re: String to array

[Alex fxmbsw7 Ratchev]

i dunno but i did string=hello and a time while i 10k and 1k, in 3s neither
finished
hm may be proot cellfone slowness

On Thu, Sep 30, 2021, 18:13 Greg Wooledge <greg@wooledge.org> wrote:

> On Thu, Sep 30, 2021 at 10:39:36AM -0400, Greg Wooledge wrote:
> > (*) Element 10 $'\n\E' is wrong, so it didn't actually work.  I suppose
> >     I need to write some messages for the other list now.
>
> The newline thing is due to sed.  As is customary, any time I encounter
> a problem with sed, *especially* if it involves newlines, I just toss sed
> out and use something else.
>
> As it turns out, perl's pretty good at this.  But it *also* has an issue
> with newlines that took me some time to dig up.  From "perldoc perlre":
>
>      .   Match any single character except newline    Not in []
>            (under /s, includes newline)
>
> So, here we go:
>
> unicorn:~$ string=$'hi bye\twhy\n\e[;1'
> unicorn:~$ string="$string" perl -e '$_=$ENV{"string"}; s/./$&\000/gs;
> print' | hd
> 00000000  68 00 69 00 20 00 62 00  79 00 65 00 09 00 77 00  |h.i.
> .b.y.e...w.|
> 00000010  68 00 79 00 0a 00 1b 00  5b 00 3b 00 31 00
> |h.y.....[.;.1.|
> 0000001e
>
> That looks usable.  The newline and escape are not crammed together
> the way they were under sed, or under perl when I didn't know I had
> to use /gs instead of /g.
>
> unicorn:~$ mapfile -d '' array < <(string="$string" perl -e
> '$_=$ENV{"string"}; s/./$&\000/gs; print')
> unicorn:~$ declare -p array
> declare -a array=([0]="h" [1]="i" [2]=" " [3]="b" [4]="y" [5]="e"
> [6]=$'\t' [7]="w" [8]="h" [9]="y" [10]=$'\n' [11]=$'\E' [12]="[" [13]=";"
> [14]="1")
>
> (There may be some way to do it with sed, but I don't have the patience
> to try to figure it out.  Suffice to say, sed 's/./&\000/g' is definitely
> not it.)
>
> The usual disclaimer applies: if you have to invoke perl from your bash
> script, you should just write the whole damned thing in perl instead.
>
>