GNU bug report logs - #8632
23.2; shell-script[bash] doesn't handle bitshift $(( 1 << 16 ))

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Package: emacs;

Reported by: Ben Wong <bug-gnu-emacs+gnu.org <at> wongs.net>

Date: Fri, 6 May 2011 23:35:01 UTC

Severity: normal

Merged with 15941

Found in versions 23.2, 24.2

Done: Stefan Monnier <monnier <at> iro.umontreal.ca>

Bug is archived. No further changes may be made.

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Ben Wong <bug-gnu-emacs+gnu.org <at> wongs.net>
Cc: 8632 <at> debbugs.gnu.org
Subject: bug#8632: 23.2; shell-script[bash] doesn't handle bitshift $(( 1 << 16 ))
Date: Fri, 13 May 2011 16:12:54 -0300

> In shell-script mode (bash minor mode) Emacs 23.2 incorrectly parses the
> following line as a HERE DOCUMENT.

> 	echo $(( 1 << 16 ))

> It is confused because sh-font-lock-open-heredoc (in sh-script.el)
> does not know about bash's ARITHMETIC EXPANSION.

Indeed, thanks for spotting this.

> There should be a function, similar to sh-in-comment-or-string, which
> parses the script looking for arithmetic expansion.

I guess the way to do it would be to try to handle $(( as
a string-opener in sh-syntax-propertize-function and then write
code to jump to the matching )) to mark it as the string-closer.

Patch welcome,


        Stefan
This bug report was last modified 11 years and 186 days ago.

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