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# -*- coding: utf-8 -*-
#--------------------------------------------------------------------------
# perl-test-5220delta.pl
#--------------------------------------------------------------------------
# REF: https://metacpan.org/pod/distribution/perl/pod/perldelta.pod
# maybe future ref: https://metacpan.org/pod/distribution/perl/pod/perl5220delta.pod
# also: http://perltricks.com/article/165/2015/4/10/A-preview-of-Perl-5-22
#
#--------------------------------------------------------------------------
# Kein-Hong Man <keinhong@gmail.com> Public Domain 20151217
#--------------------------------------------------------------------------
# 20151217 initial document
# 20151218 updated tests and comments
#--------------------------------------------------------------------------
use v5.22; # may be needed
#--------------------------------------------------------------------------
# New bitwise operators
#--------------------------------------------------------------------------
use feature 'bitwise' # enable feature, warning enabled
use experimental "bitwise"; # enable feature, warning disabled
# numerical operands
10&20 10|20 10^20 ~10
$a&"8" $a|"8" $a^"8" ~$a ~"8"
# string operands
'0'&."8" '0'|."8" '0'^."8" ~.'0' ~."8"
# the following is AMBIGUOUS, perl sees 10 and not .10 only when bitwise feature is enabled
# so it's feature-setting-dependent, no plans to change current behaviour
$a&.10 $a|.10 $a^.10 ~.$a ~.10
# assignment variants
$a&=10; $a|=10; $a^=10;
$b&.='20'; $b|.='20'; $b^.='20';
$c&="30"; $c|="30"; $c^="30";
$d&.=$e; $d|.=$e; $d^.=$e;
#--------------------------------------------------------------------------
# New double-diamond operator
#--------------------------------------------------------------------------
# <<>> is like <> but each element of @ARGV will be treated as an actual file name
# example snippet from brian d foy's blog post
while( <<>> ) { # new, safe line input operator
...;
}
#--------------------------------------------------------------------------
# New \b boundaries in regular expressions
#--------------------------------------------------------------------------
qr/\b{gcb}/
qr/\b{wb}/
qr/\b{sb}/
#--------------------------------------------------------------------------
# Non-Capturing Regular Expression Flag
#--------------------------------------------------------------------------
# disables capturing and filling in $1, $2, etc
"hello" =~ /(hi|hello)/n; # $1 is not set
#--------------------------------------------------------------------------
# Aliasing via reference
#--------------------------------------------------------------------------
# Variables and subroutines can now be aliased by assigning to a reference
\$c = \$d;
\&x = \&y;
# Aliasing can also be applied to foreach iterator variables
foreach \%hash (@array_of_hash_refs) { ... }
# example snippet from brian d foy's blog post
use feature qw(refaliasing);
\%other_hash = \%hash;
use v5.22;
use feature qw(refaliasing);
foreach \my %hash ( @array_of_hashes ) { # named hash control variable
foreach my $key ( keys %hash ) { # named hash now!
...;
}
}
#--------------------------------------------------------------------------
# New :const subroutine attribute
#--------------------------------------------------------------------------
my $x = 54321;
*INLINED = sub : const { $x };
$x++;
# more examples of attributes
# (not 5.22 stuff, but some general examples for study, useful for
# handling subroutine signature and subroutine prototype highlighting)
sub foo : lvalue ;
package X;
sub Y::x : lvalue { 1 }
package X;
sub foo { 1 }
package Y;
BEGIN { *bar = \&X::foo; }
package Z;
sub Y::bar : lvalue ;
# built-in attributes for subroutines:
lvalue method prototype(..) locked const
#--------------------------------------------------------------------------
# Repetition in list assignment
#--------------------------------------------------------------------------
# example snippet from brian d foy's blog post
use v5.22;
my(undef, $card_num, (undef)x3, $count) = split /:/;
(undef,undef,$foo) = that_function()
# is equivalent to
((undef)x2, $foo) = that_function()
#--------------------------------------------------------------------------
# Floating point parsing has been improved
#--------------------------------------------------------------------------
# Hexadecimal floating point literals
# some hex floats from a program by Rick Regan
# appropriated and extended from Lua 5.2.x test cases
# tested on perl 5.22/cygwin
0x1p-1074;
0x3.3333333333334p-5;
0xcc.ccccccccccdp-11;
0x1p+1;
0x1p-6;
0x1.b7p-1;
0x1.fffffffffffffp+1023;
0x1p-1022;
0X1.921FB4D12D84AP+1;
0x1.999999999999ap-4;
# additional test cases for characterization
0x1p-1074. # dot is a string operator
0x.ABCDEFp10 # legal, dot immediately after 0x
0x.p10 # perl allows 0x as a zero, then concat with p10 bareword
0x.p 0x0.p # dot then bareword
0x_0_.A_BC___DEF_p1_0 # legal hex float, underscores are mostly allowed
0x0._ABCDEFp10 # _ABCDEFp10 is a bareword, no underscore allowed after dot
# illegal, but does not use error highlighting
0x0p1ABC # illegal, highlighted as 0x0p1 abut with bareword ABC
# allowed to FAIL for now
0x0.ABCDEFp_10 # ABCDEFp_10 is a bareword, '_10' exponent not allowed
0xp 0xp1 0x0.0p # syntax errors
0x41.65.65 # hex dot number, but lexer now fails with 0x41.65 left as a partial hex float
#--------------------------------------------------------------------------
# Support for ?PATTERN? without explicit operator has been removed
#--------------------------------------------------------------------------
# ?PATTERN? must now be written as m?PATTERN?
?PATTERN? # does not work in current LexPerl anyway, NO ACTION NEEDED
m?PATTERN?
#--------------------------------------------------------------------------
# end of test file
#--------------------------------------------------------------------------
|
