Syntax highlight error on quotes inside $(( ))

[mozirilla213]

GNU bash, version 5.1.16(1)-release (x86_64-pc-linux-gnu) [Arch Linux]
ble.sh, version 0.4.0-devel4+0906fd95 (noarch) [git 2.40.1, GNU Make 4.4.1, GNU Awk 5.2.2, API 3.2, PMA Avon 8-g1, (GNU MPFR 4.2.0-p9, GNU MP 6.2.1)]
bash-completion, version 2.11 (hash:2d02f73e803daa87a06e94e33b2a7b3e672a2c0c, 76338 bytes) (noarch)
locale: LANG=C
terminal: TERM=xterm-256color wcwidth=15.0-west/13.0-2+ri, konsole:220380 (1;115;0)

The first double quote inside $(( )), not (( )) is highlighted as syntax error

echo $(("$1" + "$2"))
#       ↑      ↑

or both quotes in these:

echo $(("10" + 20))
echo $((`echo 10` "+" 20))

[akinomyoga]

Thanks for the report. Originally the check for the quoting in the arithmetic context was implemented for Bash 4.3. However, the behavior of Bash seems to have changed. After your report, I have made comprehensive tests for quoting in the arithmetic context. Here are the behavioral differences of different quoting between different contexts and Bash versions, where the check mark indicates that the quoting is supported:

COMMAND	3.0..4.3	4.4..5.0	5.1	5.2..dev
echo $((\10))	⬜	⬜	⬜	⬜
echo $(('10'))	⬜	⬜	⬜	⬜
echo $(($'10'))	⬜	⬜	⬜	⬜
echo $(("10"))	⬜	✅	✅	✅
echo $(($"10"))	⬜	✅	✅	✅
echo $((a[\10]))	✅	⬜	⬜	⬜
echo $((a["10"]))	✅	✅	✅	✅
echo $((`echo 10`))	✅	✅	✅	✅
echo $[\10]	⬜	⬜	⬜	⬜
echo $['10']	⬜	⬜	⬜	⬜
echo $[$'10']	⬜	⬜	⬜	⬜
echo $["10"]	⬜	✅	✅	✅
echo $[$"10"]	⬜	✅	✅	✅
echo $[a[\10]]	✅	⬜	⬜	⬜
echo $[a["10"]]	✅	✅	✅	✅
echo $[`echo 10`]	✅	✅	✅	✅
((\10))	✅	✅	⬜	⬜
(('10'))	✅	✅	⬜	⬜
(($'10'))	✅	✅	⬜	⬜
(("10"))	✅	✅	✅	✅
(($"10"))	✅	✅	✅	✅
((a[\10]))	✅	✅	⬜	⬜
((a["10"]))	✅	✅	✅	✅
((`echo 10`))	✅	✅	✅	✅
b[\10]=	✅	⬜	⬜	⬜
b['10']=	✅	⬜	⬜	⬜
b[$'10']=	✅	⬜	⬜	⬜
b["10"]=	✅	✅	✅	✅
b[$"10"]=	✅	✅	✅	✅
b[a[\10]]=	✅	⬜	⬜	⬜
b[a["10"]]=	✅	✅	✅	✅
b[`echo 10`]=	✅	✅	✅	✅
: ${b[\10]}	✅	⬜	⬜	⬜
: ${b['10']}	✅	⬜	⬜	⬜
: ${b[$'10']}	✅	⬜	⬜	⬜
: ${b["10"]}	✅	✅	✅	✅
: ${b[$"10"]}	✅	✅	✅	✅
: ${b[a[\10]]}	✅	⬜	⬜	⬜
: ${b[a["10"]]}	✅	✅	✅	✅
: ${b[`echo 10`]}	✅	✅	✅	✅
b=([\10]=)	✅	✅	✅	✅
b=(['10']=)	✅	✅	✅	✅
b=([$'10']=)	✅	✅	✅	✅
b=(["10"]=)	✅	✅	✅	✅
b=([$"10"]=)	✅	✅	✅	✅
b=([a[\10]]=)	✅	✅	✅	✅
b=([a["10"]]=)	✅	✅	✅	✅
b=([`echo 10`]=)	✅	✅	✅	✅
: ${v:\10}	⬜	⬜	⬜	⬜
: ${v:'10'}	⬜	⬜	⬜	⬜
: ${v:$'10'}	⬜	⬜	⬜	⬜
: ${v:"10"}	⬜	⬜	⬜	✅
: ${v:$"10"}	⬜	⬜	⬜	✅
: ${v:a[\10]}	✅	⬜	⬜	⬜
: ${v:a["10"]}	✅	✅	✅	✅
: ${v:`echo 10`}	✅	✅	✅	✅
: "${v:\10}"	⬜	⬜	⬜	⬜
: "${v:'10'}"	⬜	⬜	⬜	⬜
: "${v:$'10'}"	✅	✅	✅	✅
: "${v:"10"}"	⬜	⬜	⬜	✅
: "${v:$"10"}"	⬜	⬜	⬜	✅
: "${v:a[\10]}"	✅	⬜	⬜	⬜
: "${v:a["10"]}"	✅	✅	✅	✅
: "${v:`echo 10`}"	✅	✅	✅	✅

The behavior also depends on shopt -s extquote.

[akinomyoga]

I've supported the Bash-version dependent checking in commit 611c1d9. (For a few contexts, I gave up a perfect implementation for older versions of Bash.) Could you update ble.sh by running the command ble-update and check the behavior?