# fsplit-p.sh: test of field splitting for any POSIX-compliant shell

posix="true"
setup -d

test_o 'default IFS (no inherited environment variable)'
printf "[%s]\n" "$IFS"
__IN__
[ 	
]
__OUT__

test_o 'default IFS (overriding environment variable)'
IFS=X $TESTEE <<'__INNER__'
printf "[%s]\n" "$IFS"
__INNER__
__IN__
[ 	
]
__OUT__

test_oE -e 0 'field splitting applies to results of expansions'
IFS=' 0' a='1 2'
bracket     -${a}- -$(echo '3 4')- -`echo '5 6'`- -$((708))-
bracket ${a+-${a}- -$(echo '3 4')- -`echo '5 6'`- -$((708))-}
bracket ${u--${a}- -$(echo '3 4')- -`echo '5 6'`- -$((708))-}
__IN__
[-1][2-][-3][4-][-5][6-][-7][8-]
[-1][2-][-3][4-][-5][6-][-7][8-]
[-1][2-][-3][4-][-5][6-][-7][8-]
__OUT__

test_oE -e 0 'field splitting does not apply to quoted expansions'
IFS=' 0' a='1 2'
bracket     "-${a}-" "-$(echo '3 4')-" "-`echo '5 6'`-" "-$((708))-"
bracket ${a+"-${a}-" "-$(echo '3 4')-" "-`echo '5 6'`-" "-$((708))-"}
bracket ${u-"-${a}-" "-$(echo '3 4')-" "-`echo '5 6'`-" "-$((708))-"}
bracket "${a+-${a}-   -$(echo '3 4')-   -`echo '5 6'`-   -$((708))-}"
bracket "${u--${a}-   -$(echo '3 4')-   -`echo '5 6'`-   -$((708))-}"
bracket -${a}-"-${a}-"-${a}-
__IN__
[-1 2-][-3 4-][-5 6-][-708-]
[-1 2-][-3 4-][-5 6-][-708-]
[-1 2-][-3 4-][-5 6-][-708-]
[-1 2-   -3 4-   -5 6-   -708-]
[-1 2-   -3 4-   -5 6-   -708-]
[-1][2--1 2--1][2-]
__OUT__

test_oE 'field splitting does not apply to non-expansions'
IFS=' 0'
bracket -102- "-304 5-" '-607 8-' -9\01\ 2-
__IN__
[-102-][-304 5-][-607 8-][-901 2-]
__OUT__

test_oE 'no field splitting with empty IFS'
IFS= a='1 2	3
4'
bracket $a
__IN__
[1 2	3
4]
__OUT__

test_oE 'field splitting with unset IFS'
unset IFS
a='1 2	3
4' b=' 	
5 	
6 	
'
bracket $a $b
__IN__
[1][2][3][4][5][6]
__OUT__

test_oE 'field splitting with standard IFS'
IFS=' 	
'
a='1 2	3
4' b=' 	
5 	
6 	
' c='-"%"\'
bracket $a $b $c
__IN__
[1][2][3][4][5][6][-"%"\]
__OUT__

test_oE 'field splitting with non-whitespace IFS'
IFS='-"'
a='1-2"3' b='--4-"5"-6-7'
bracket $a
bracket $b
__IN__
[1][2][3]
[][][4][][5][][6][7]
__OUT__

test_oE 'complex field splitting with nonsuccessive non-whitespace IFS'
IFS=' -"'
a='1%2-3"4&5' b='- 22- 3- 44 ' c=' -22 -3 -44 ' d=' - 22 - 3 - 44'
bracket $a
bracket $b
bracket $c
bracket $d
__IN__
[1%2][3][4&5]
[][22][3][44]
[][22][3][44]
[][22][3][44]
__OUT__

test_oE 'complex field splitting with successive non-whitespace IFS'
IFS=' -'
a='--3""3' b='  --33' c='-  -33' d='--  33'
bracket $a
bracket $b
bracket $c
bracket $d
__IN__
[][][3""3]
[][][33]
[][][33]
[][][33]
__OUT__

test_oE 'backslash not in IFS'
IFS=' -'
a='\x' b='\ \x' c='\  \x' d='\-\x' e='\--\x' f='-\\ -\-\x'
bracket $a
bracket $b
bracket $c
bracket $d
bracket $e
bracket $f
__IN__
[\x]
[\][\x]
[\][\x]
[\][\x]
[\][][\x]
[][\\][\][\x]
__OUT__

test_oE 'backslash in IFS'
IFS=' \-'
a='\x' b='\ \x' c='\  \x' d='\-\x' e='\--\x' f='-\\ -\-x' g='1\2\\ 4-5\- 7\x'
bracket $a
bracket $b
bracket $c
bracket $d
bracket $e
bracket $f
bracket $g
__IN__
[][x]
[][][x]
[][][x]
[][][][x]
[][][][][x]
[][][][][][][x]
[1][2][][4][5][][7][x]
__OUT__

# If field splitting yields a single empty field and it is not quoted, then it
# is removed.
test_oE 'empty field removal'
a= b=' ' c=' - '
bracket 1 $a
bracket 2 $b
bracket 3 ''$a ""$a
bracket 4 ''$b ""$b
bracket 5 $a'' $a""
bracket 6 $b'' $b""
bracket 7 ''$a'' ""$a""
bracket 8 ''$b'' ""$b""
bracket 9 ''$c'' ""$c""
bracket 10 ${a:-''} ${a:-""}
#bracket 11 "${a:-''}" "${a:-""}"
bracket 12 "$a"
bracket 13 "$b"
bracket 14 "" """"""
bracket 15 '' ''''''
__IN__
[1]
[2]
[3][][]
[4][][]
[5][][]
[6][][]
[7][][]
[8][][][][]
[9][][-][][][-][]
[10][][]
[12][]
[13][ ]
[14][][]
[15][][]
__OUT__

test_oE 'empty field removal with empty IFS'
IFS= a=
bracket $a - $IFS
__IN__
[-]
__OUT__

test_oE 'empty last field is ignored (non-backslash IFS)'
IFS=' ='
a='='; bracket $a
a='=='; bracket $a
a='==='; bracket $a
a='1'; bracket $a
a='1='; bracket $a
a='1=='; bracket $a
a='1==='; bracket $a
echo ===
a='1= '; bracket $a
a='1==  '; bracket $a
a='1===   '; bracket $a
echo ===
a='1= ='; bracket $a
a='1==  ='; bracket $a
a='1===   ='; bracket $a
__IN__
[]
[][]
[][][]
[1]
[1]
[1][]
[1][][]
===
[1]
[1][]
[1][][]
===
[1][]
[1][][]
[1][][][]
__OUT__

test_oE 'empty last field is ignored (backslash IFS)'
IFS=' =\'
a='\'; bracket $a
a='\\'; bracket $a
a='\\\'; bracket $a
a='1'; bracket $a
a='1\'; bracket $a
a='1\\'; bracket $a
a='1\\\'; bracket $a
echo ===
a='1\ '; bracket $a
a='1\\  '; bracket $a
a='1\\\   '; bracket $a
echo ===
a='1\ \'; bracket $a
a='1\\  \'; bracket $a
a='1\\\   \'; bracket $a
__IN__
[]
[][]
[][][]
[1]
[1]
[1][]
[1][][]
===
[1]
[1][]
[1][][]
===
[1][]
[1][][]
[1][][][]
__OUT__