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Re: Parse error with consecutive case statements inside $()


From: Piotr Grzybowski
Subject: Re: Parse error with consecutive case statements inside $()
Date: Fri, 1 Apr 2016 10:21:43 +0200

Hello!

 I firmly believe that the attached patch fixes the problem at hand; what it breaks I have no idea. Kindly requesting a review.

cheers,
pg

P.S.
 it also fixes others of the similar type, e.g.:

x=$(case 1 in 1) echo 1;; esac; case 2 in 2) echo 2;; esac;)
echo $x

P.P.S.
 vim :syntax notices the original parsing error, probably assuming ')' in case value closes command subsitution. That, however, is beyond my ability to fix.


On Tue, Mar 29, 2016 at 7:43 PM, Christian Franke <address@hidden> wrote:
Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: cygwin
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash.exe' -DCONF_HOSTTYPE='i686' -DCONF_OSTYPE='cygwin' -DCONF_MACHTYPE='i686-pc-cygwin' -DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -DRECYCLES_PIDS   -I. -I/usr/src/bash-4.3.42-4.i686/src/bash-4.3 -I/usr/src/bash-4.3.42-4.i686/src/bash-4.3/include -I/usr/src/bash-4.3.42-4.i686/src/bash-4.3/lib  -DWORDEXP_OPTION -ggdb -O2 -pipe -Wimplicit-function-declaration -fdebug-prefix-map=/usr/src/bash-4.3.42-4.i686/build=/usr/src/debug/bash-4.3.42-4 -fdebug-prefix-map=/usr/src/bash-4.3.42-4.i686/src/bash-4.3=/usr/src/debug/bash-4.3.42-4
uname output: CYGWIN_NT-6.1-WOW Alien2 2.4.1(0.293/5/3) 2016-01-24 11:24 i686 Cygwin
Machine Type: i686-pc-cygwin

Bash Version: 4.3
Patch Level: 42
Release Status: release

Description:
If consecutive case statements are inside of $(...), the parser misinterprets first ')' from second case statement as the end of command substitution.

The possibly related patch bash43-042 is already included in this version.


Repeat-By:

$ cat bug.sh
x=$(
  case 1 in
    1) echo 1
  esac
  case 2 in
    2) echo 2
  esac
)
echo "$x"


$ bash -xv bug.sh
x=$(
  case 1 in
    1) echo 1
  esac
  case 2 in
    2) echo 2
bug.sh: command substitution: line 13: syntax error: unexpected end of file
bug.sh: line 7: syntax error near unexpected token `esac'
bug.sh: line 7: ` esac'


$ dash bug.sh
1
2


Workarounds:
- append semicolon behind first 'esac', or
- insert any command line between the case statements, or
- use `...` instead of $(...)


--
Christian Franke



Attachment: fix-case-inside-command-substitution.patch
Description: Binary data


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