1 |
## compare_shells: bash
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2 |
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3 |
# Var refs are done with ${!a}
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4 |
#
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5 |
# local/declare -n is tested in spec/named-ref.test.sh.
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6 |
#
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7 |
# http://stackoverflow.com/questions/16461656/bash-how-to-pass-array-as-an-argument-to-a-function
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8 |
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#### var ref ${!a}
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10 |
a=b
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b=c
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echo ref ${!a} ${a}
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## stdout: ref c b
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14 |
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#### ${!ref-default}
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ref=x
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echo x=${!ref-default}
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x=''
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echo x=${!ref-default}
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x=foo
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echo x=${!ref-default}
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## STDOUT:
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x=default
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x=
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x=foo
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## END
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#### ${!undef:-}
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# bash gives empty string, but I feel like this could be an error
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echo undef=${!undef-'default'}
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echo undef=${!undef}
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35 |
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set -u
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echo NOUNSET
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echo undef=${!undef-'default'}
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echo undef=${!undef}
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## status: 1
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## STDOUT:
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undef=default
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undef=
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NOUNSET
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undef=default
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## END
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#### comparison to ${!array[@]} keys (similar SYNTAX)
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declare -a a=(x y)
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argv.py "${!a[@]}"
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echo a_keys=$?
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argv.py "${!a}" # missing [] is equivalent to ${!a[0]} ?
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echo a_nobrackets=$?
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echo ---
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declare -A A=([A]=a [B]=b)
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argv.py ${!A[@]}
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echo A_keys=$?
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argv.py "${!A}" # missing [] is equivalent to ${!A[0]} ?
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echo A_nobrackets=$?
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## STDOUT:
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['0', '1']
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a_keys=0
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['']
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a_nobrackets=0
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---
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['A', 'B']
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A_keys=0
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['']
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A_nobrackets=0
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## END
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#### ${!a[@]-'default'} is illegal
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# bash disallows this when a is an array. We make it an error because [@]
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# implies it's an array.
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argv.py "${!a[@]-default}"
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echo status=$?
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a=(x y z)
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argv.py "${!a[@]-default}"
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echo status=$?
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## status: 1
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## STDOUT:
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## END
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## BUG bash status: 0
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## BUG bash STDOUT:
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['default']
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status=0
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status=1
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## END
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#### var ref to $@ with @
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set -- one two
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ref='@'
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echo ref=${!ref}
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## STDOUT:
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ref=one two
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## END
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#### var ref to $1 and $2 with 1 and 2
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set -- one two
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ref1='1'
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echo ref1=${!ref1}
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ref2='2'
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echo ref2=${!ref2}
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## STDOUT:
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ref1=one
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ref2=two
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## END
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#### var ref: 1, @, *
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set -- x y
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ref=1; argv.py "${!ref}"
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ref=@; argv.py "${!ref}"
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ref=*; argv.py "${!ref}" # maybe_decay_array bug?
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## STDOUT:
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['x']
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['x', 'y']
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['x y']
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## END
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#### var ref to special var BASH_SOURCE
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ref='LINENO'
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echo lineno=${!ref}
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## STDOUT:
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lineno=2
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## END
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#### var ref to $? with '?'
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myfunc() {
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local ref=$1
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echo ${!ref}
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}
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myfunc FUNCNAME
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myfunc '?'
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## STDOUT:
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myfunc
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0
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## END
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#### Var ref, then assignment with ${ := }
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z=zz
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zz=
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echo ${!z:=foo}
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echo ${!z:=bar}
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## STDOUT:
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foo
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foo
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## END
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#### Var ref, then error with ${ ? }
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w=ww
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ww=
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echo ${!w:?'my message'}
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echo done
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## status: 1
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## STDOUT:
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## END
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#### Indirect expansion, THEN suffix operators
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check_eq() {
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[ "$1" = "$2" ] || { echo "$1 vs $2"; }
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}
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check_expand() {
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val=$(eval "echo \"$1\"")
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[ "$val" = "$2" ] || { echo "$1 -> expected $2, got $val"; }
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}
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check_err() {
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e="$1"
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msg=$(eval "$e" 2>&1) && echo "bad success: $e"
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if test -n "$2"; then
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if [[ "$msg" != $2 ]]; then
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echo "Expected error: $e"
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echo "Got error : $msg"
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fi
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fi
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}
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# Nearly everything in manual section 3.5.3 "Shell Parameter Expansion"
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# is allowed after a !-indirection.
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#
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# Not allowed: any further prefix syntax.
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x=xx; xx=aaabcc
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xd=x
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check_err '${!!xd}'
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check_err '${!!x*}'
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a=(asdf x)
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check_err '${!!a[*]}'
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check_err '${!#x}'
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check_err '${!#a[@]}'
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# And an array reference binds tighter in the syntax, so goes first;
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# there's no way to spell "indirection, then array reference".
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check_expand '${!a[1]}' xx
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b=(aoeu a)
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check_expand '${!b[1]}' asdf # i.e. like !(b[1]), not (!b)[1]
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#
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# Allowed: apparently everything else.
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y=yy; yy=
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check_expand '${!y:-foo}' foo
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check_expand '${!x:-foo}' aaabcc
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check_expand '${!x:?oops}' aaabcc
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check_expand '${!y:+foo}' ''
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check_expand '${!x:+foo}' foo
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check_expand '${!x:2}' abcc
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check_expand '${!x:2:2}' ab
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check_expand '${!x#*a}' aabcc
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check_expand '${!x%%c*}' aaab
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check_expand '${!x/a*b/d}' dcc
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# ^ operator not fully implemented in OSH
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#check_expand '${!x^a}' Aaabcc
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p=pp; pp='\$ '
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check_expand '${!p@P}' '$ '
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echo ok
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## stdout: ok
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#### var ref OF array var -- silent a[0] decay
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declare -a a=(ale bean)
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echo first=${!a}
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ale=zzz
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echo first=${!a}
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## status: 0
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## STDOUT:
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first=
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first=zzz
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## END
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#### array ref
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declare -a array=(ale bean)
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ref='array[0]'
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echo ${!ref}
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## status: 0
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## STDOUT:
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ale
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## END
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#### array ref with strict_array
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shopt -s strict_array
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declare -a array=(ale bean)
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ref='array'
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echo ${!ref}
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## status: 1
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## stdout-json: ""
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## N-I bash status: 0
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## N-I bash STDOUT:
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ale
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## END
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#### var ref TO array var
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shopt -s compat_array
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declare -a array=(ale bean)
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ref='array' # when compat_array is on, this is like array[0]
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ref_AT='array[@]'
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echo ${!ref}
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echo ${!ref_AT}
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## STDOUT:
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ale
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ale bean
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## END
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#### var ref TO array var, with subscripts
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f() {
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288 |
argv.py "${!1}"
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}
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f 'nonexistent[0]'
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array=(x y z)
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f 'array[0]'
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f 'array[1+1]'
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f 'array[@]'
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f 'array[*]'
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# Also associative arrays.
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## STDOUT:
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['']
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['x']
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['z']
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['x', 'y', 'z']
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['x y z']
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## END
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#### var ref TO assoc array a[key]
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shopt -s compat_array
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declare -A assoc=([ale]=bean [corn]=dip)
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ref=assoc
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#ref_AT='assoc[@]'
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311 |
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# UNQUOTED doesn't work with Oil's parser
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#ref_SUB='assoc[ale]'
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ref_SUB='assoc["ale"]'
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ref_SUB_QUOTED='assoc["al"e]'
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ref_SUB_BAD='assoc["bad"]'
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echo ref=${!ref} # compat_array: assoc is equivalent to assoc[0]
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#echo ref_AT=${!ref_AT}
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echo ref_SUB=${!ref_SUB}
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echo ref_SUB_QUOTED=${!ref_SUB_QUOTED}
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echo ref_SUB_BAD=${!ref_SUB_BAD}
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325 |
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## STDOUT:
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327 |
ref=
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328 |
ref_SUB=bean
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ref_SUB_QUOTED=bean
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330 |
ref_SUB_BAD=
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## END
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332 |
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333 |
#### var ref TO array with arbitrary subscripts
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334 |
shopt -s eval_unsafe_arith compat_array
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335 |
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f() {
|
337 |
local val=$(echo "${!1}")
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338 |
if test "$val" = y; then
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339 |
echo "works: $1"
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340 |
fi
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341 |
}
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342 |
# Warmup: nice plain array reference
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343 |
a=(x y)
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344 |
f 'a[1]'
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345 |
#
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346 |
# Not allowed:
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347 |
# no brace expansion
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348 |
f 'a[{1,0}]' # operand expected
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349 |
# no process substitution (but see command substitution below!)
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350 |
f 'a[<(echo x)]' # operand expected
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351 |
# TODO word splitting seems interesting
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352 |
aa="1 0"
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353 |
f 'a[$aa]' # 1 0: syntax error in expression (error token is "0")
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354 |
# no filename globbing
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355 |
f 'a[b*]' # operand expected
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356 |
f 'a[1"]' # bad substitution
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357 |
#
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358 |
# Allowed: most everything else in section 3.5 "Shell Expansions".
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359 |
# shell parameter expansion
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360 |
b=1
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361 |
f 'a[$b]'
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362 |
f 'a[${c:-1}]'
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363 |
# (... and presumably most of the other features there)
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364 |
# command substitution, yikes!
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365 |
f 'a[$(echo 1)]'
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366 |
# arithmetic expansion
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367 |
f 'a[$(( 3 - 2 ))]'
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368 |
|
369 |
# All of these are undocumented and probably shouldn't exist,
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370 |
# though it's always possible some will turn up in the wild and
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371 |
# we'll end up implementing them.
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372 |
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373 |
## STDOUT:
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374 |
works: a[1]
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375 |
works: a[$b]
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376 |
works: a[${c:-1}]
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377 |
works: a[$(echo 1)]
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378 |
works: a[$(( 3 - 2 ))]
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379 |
## END
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380 |
|
381 |
#### Bizarre tilde expansion in array index
|
382 |
a=(x y)
|
383 |
PWD=1
|
384 |
ref='a[~+]'
|
385 |
echo ${!ref}
|
386 |
## status: 1
|
387 |
## BUG bash status: 0
|
388 |
## BUG bash STDOUT:
|
389 |
y
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390 |
## END
|
391 |
|
392 |
#### Indirect expansion TO fancy expansion features bash disallows
|
393 |
|
394 |
check_indir() {
|
395 |
result="${!1}"
|
396 |
desugared_result=$(eval 'echo "${'"$1"'}"')
|
397 |
[ "$2" = "$desugared_result" ] || { echo "$1 $desugared_result"; }
|
398 |
}
|
399 |
x=y
|
400 |
y=a
|
401 |
a=(x y)
|
402 |
declare -A aa
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403 |
aa=([k]=r [l]=s)
|
404 |
# malformed array indexing
|
405 |
check_indir "a[0"
|
406 |
check_indir "aa[k"
|
407 |
# double indirection
|
408 |
check_indir "!x" a
|
409 |
check_indir "!a[0]" y
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410 |
# apparently everything else in the manual under "Shell Parameter Expansion"
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411 |
check_indir "x:-foo" y
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412 |
check_indir "x:=foo" y
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413 |
check_indir "x:?oops" y
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414 |
check_indir "x:+yy" yy
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415 |
check_indir "x:0" y
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416 |
check_indir "x:0:1" y
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417 |
check_indir "!a@" "a aa"
|
418 |
# (!a[@] is elsewhere)
|
419 |
check_indir "#x" 1
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420 |
check_indir "x#y"
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421 |
check_indir "x/y/foo" foo
|
422 |
check_indir "x@Q" "'y'"
|
423 |
echo done
|
424 |
## status: 1
|
425 |
## stdout-json: ""
|
426 |
## OK bash status: 0
|
427 |
## OK bash stdout: done
|
428 |
|
429 |
#### Bad var ref
|
430 |
a='bad var name'
|
431 |
echo ref ${!a}
|
432 |
echo status=$?
|
433 |
|
434 |
## STDOUT:
|
435 |
status=1
|
436 |
## END
|
437 |
## OK osh stdout-json: ""
|
438 |
## OK osh status: 1
|
439 |
|
440 |
#### Bad var ref 2
|
441 |
b='/' # really bad
|
442 |
echo ref ${!b}
|
443 |
echo status=$?
|
444 |
## STDOUT:
|
445 |
status=1
|
446 |
## END
|
447 |
## OK osh stdout-json: ""
|
448 |
## OK osh status: 1
|
449 |
|
450 |
#### ${!OPTIND} (used by bash completion
|
451 |
set -- a b c
|
452 |
echo ${!OPTIND}
|
453 |
f() {
|
454 |
local OPTIND=1
|
455 |
echo ${!OPTIND}
|
456 |
local OPTIND=2
|
457 |
echo ${!OPTIND}
|
458 |
}
|
459 |
f x y z
|
460 |
## STDOUT:
|
461 |
a
|
462 |
x
|
463 |
y
|
464 |
## END
|
465 |
|
466 |
#### var ref doesn't need cycle detection
|
467 |
x=y
|
468 |
y=x
|
469 |
echo cycle=${!x}
|
470 |
|
471 |
typeset -n a=b
|
472 |
typeset -n b=a
|
473 |
echo cycle=${a}
|
474 |
## status: 1
|
475 |
## STDOUT:
|
476 |
cycle=x
|
477 |
## END
|
478 |
## OK bash status: 0
|
479 |
## OK bash STDOUT:
|
480 |
cycle=x
|
481 |
cycle=
|
482 |
## END
|
483 |
|
484 |
#### Var Ref Code Injection $(tee PWNED)
|
485 |
|
486 |
typeset -a a
|
487 |
a=(42)
|
488 |
|
489 |
x='a[$(echo 0 | tee PWNED)]'
|
490 |
|
491 |
echo ${!x}
|
492 |
|
493 |
if test -f PWNED; then
|
494 |
echo PWNED
|
495 |
cat PWNED
|
496 |
else
|
497 |
echo NOPE
|
498 |
fi
|
499 |
|
500 |
## status: 1
|
501 |
## STDOUT:
|
502 |
## END
|
503 |
|
504 |
## BUG bash status: 0
|
505 |
## BUG bash STDOUT:
|
506 |
42
|
507 |
PWNED
|
508 |
0
|
509 |
## END
|