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