Re: ${assoc[key]+set} no longer works.

[Geir Hauge]

2014-03-18 16:19 GMT+01:00 Chet Ramey chet.ra...@case.edu:

 On 3/18/14 5:36 AM, geir.ha...@gmail.com wrote:

  Bash Version: 4.3
  Patch Level: 0
  Release Status: release
 
  Description:
  With an associative array, assoc, ${assoc[key]+set} expands to the
  empty string if the associated value is the empty string.

 Thanks for the report.  This was a consequence of a change made back in
 2011 to expand the value portion of the assignment statement a slightly
 different way.  I've attached a patch to fix it.


Thanks. That patch also makes  [[ -v assoc[x] ]]  return 0. However,
[[ -v assoc ]] returns 1 (which it also does before the patch). Sounds
related to this bug.

-- 
Geir Hauge

Re: ${assoc[key]+set} no longer works.

[Chet Ramey]

On 3/19/14, 5:42 PM, Geir Hauge wrote:

  Description:
  With an associative array, assoc, ${assoc[key]+set} expands to the
  empty string if the associated value is the empty string.
 
 Thanks for the report.  This was a consequence of a change made back in
 2011 to expand the value portion of the assignment statement a slightly
 different way.  I've attached a patch to fix it.
 
  
 Thanks. That patch also makes  [[ -v assoc[x] ]]  return 0. However,
 [[ -v assoc ]] returns 1 (which it also does before the patch). Sounds
 related to this bug.

That's not a bug.  Referencing any array without a subscript is equivalent
to referencing subscript 0.  In the case of an associative array, that's
${assoc[0]}.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRUc...@case.eduhttp://cnswww.cns.cwru.edu/~chet/

${assoc[key]+set} no longer works.

[geir . hauge]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-unknown-linux-gnu' 
-DCONF_VENDOR='unknown' -DLOCALEDIR='/usr/local/share/locale' -DPACKAGE='bash' 
-DSHELL -DHAVE_CONFIG_H   -I.  -I. -I./include -I./lib   -g -O2
uname output: Linux gina 3.2.0-59-generic #90-Ubuntu SMP Tue Jan 7 22:43:51 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-unknown-linux-gnu

Bash Version: 4.3
Patch Level: 0
Release Status: release

Description:
With an associative array, assoc, ${assoc[key]+set} expands to the
empty string if the associated value is the empty string.

Repeat-By:
$ declare -A assoc='([x]= [y]=1 )'
$ printf '%s\n' ${assoc[x]+x is a key} ${assoc[y]+y is a key}

y is a key

Re: ${assoc[key]+set} no longer works.

[Chet Ramey]

On 3/18/14 5:36 AM, geir.ha...@gmail.com wrote:

 Bash Version: 4.3
 Patch Level: 0
 Release Status: release
 
 Description:
 With an associative array, assoc, ${assoc[key]+set} expands to the
 empty string if the associated value is the empty string.

Thanks for the report.  This was a consequence of a change made back in
2011 to expand the value portion of the assignment statement a slightly
different way.  I've attached a patch to fix it.

Chet

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRUc...@case.eduhttp://cnswww.cns.cwru.edu/~chet/
*** ../bash-4.3/arrayfunc.c	2013-08-02 16:19:59.0 -0400
--- arrayfunc.c	2014-03-18 11:08:15.0 -0400
***
*** 598,601 
--- 598,606 
  	{
  	  val = expand_assignment_string_to_string (val, 0);
+ 	  if (val == 0)
+ 	{
+ 	  val = (char *)xmalloc (1);
+ 	  val[0] = '\0';	/* like do_assignment_internal */
+ 	}
  	  free_val = 1;
  	}