X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/6709de8803f0c22efc6a56325285452eb6dbb1e1..07be2aceb8f7f85f78ffa812b42b93d38d740bcb:/pod/perldelta.pod diff --git a/pod/perldelta.pod b/pod/perldelta.pod index 87a8592..3669450 100644 --- a/pod/perldelta.pod +++ b/pod/perldelta.pod @@ -5,16 +5,16 @@ [ this is a template for a new perldelta file. Any text flagged as XXX needs to be processed before release. ] -perldelta - what is new for perl v5.13.6 +perldelta - what is new for perl v5.13.7 =head1 DESCRIPTION -This document describes differences between the 5.13.5 release and -the 5.13.6 release. +This document describes differences between the 5.13.6 release and +the 5.13.7 release. -If you are upgrading from an earlier release such as 5.13.4, first read -L, which describes differences between 5.13.4 and -5.13.5. +If you are upgrading from an earlier release such as 5.13.5, first read +L, which describes differences between 5.13.5 and +5.13.6. =head1 Notice @@ -28,45 +28,31 @@ here, but most should go in the L section. [ List each enhancement as a =head2 entry ] -=head2 C<(?^...)> regex construct added to signify default modifiers +=head2 Single term prototype -A caret (also called a "cirumflex accent") C<"^"> immediately following -a C<"(?"> in a regular expression now means that the subexpression is to -not inherit the surrounding modifiers such as C, but to revert to the -Perl defaults. Any modifiers following the caret override the defaults. +The C<+> prototype is a special alternative to C<$> that will act like +C<\[@%]> when given a literal array or hash variable, but will otherwise +force scalar context on the argument. This is useful for functions which +should accept either a literal array or an array reference as the argument: -The stringification of regular expressions now uses this notation. The -main purpose of this is to allow tests that rely on the stringification -to not have to change when new modifiers are added. See -L. + sub smartpush (+@) { + my $aref = shift; + die "Not an array or arrayref" unless ref $aref eq 'ARRAY'; + push @$aref, @_; + } -=head2 C<"d">, C<"l">, and C<"u"> regex modifiers added +When using the C<+> prototype, your function must check that the argument +is of an acceptable type. -These modifiers are currently only available within a C<(?...)> construct. +=head2 C -The C<"l"> modifier says to compile the regular expression as if it were -in the scope of C, even if it is not. +The C pragma now has the ability to turn on regular expression flags +till the end of the lexical scope: -The C<"u"> modifier currently does nothing. + use re '/x'; + "foo" =~ / (.+) /; # /x implied -The C<"d"> modifier is used in the scope of C to compile the -regular expression as if it were not in that scope. -See L. - -=head2 C<\N{...}> now handles Unicode named character sequences - -Unicode has a number of named character sequences, in which particular sequences -of code points are given names. C<\N{...}> now recognizes these. -See L. - -=head2 New function C - -This function is a run-time version of C<\N{...}>, returning the string -of characters whose Unicode name is its parameter. It can handle -Unicode named character sequences, whereas the pre-existing -C cannot, as the latter returns a single code -point. -See L. +See L for details. =head1 Security @@ -78,67 +64,13 @@ L section. =head1 Incompatible Changes -=head2 Stringification of regexes has changed - -Default regular expression modifiers are now notated by using -C<(?^...)>. Code relying on the old stringification will fail. The -purpose of this is so that when new modifiers are added, such code will -not have to change (after this one time), as the stringification will -automatically incorporate the new modifiers. - -Code that needs to work properly with both old- and new-style regexes -can avoid the whole issue by using (for Perls since 5.9.5): - - use re qw(regexp_pattern); - my ($pat, $mods) = regexp_pattern($re_ref); - -where C<$re_ref> is a reference to a compiled regular expression. Upon -return, C<$mods> will be a string containing all the non-default -modifiers used when the regular expression was compiled, and C<$pattern> -the actual pattern. - -If the actual stringification is important, or older Perls need to be -supported, you can use something like the following: +XXX For a release on a stable branch, this section aspires to be: - # Accept both old and new-style stringification - my $modifiers = (qr/foobar/ =~ /\Q(?^/) ? '^' : '-xism'; - -And then use C<$modifiers> instead of C<-xism>. - -=head2 Regular expressions retain their localeness when interpolated - -Regular expressions compiled under C<"use locale"> now retain this when -interpolated into a new regular expression compiled outside a -C<"use locale">, and vice-versa. - -Previously, a regular expression interpolated into another one inherited -the localeness of the surrounding one, losing whatever state it -originally had. This is considered a bug fix, but may trip up code that -has come to rely on the incorrect behavior. + There are no changes intentionally incompatible with 5.XXX.XXX. If any + exist, they are bugs and reports are welcome. [ List each incompatible change as a =head2 entry ] -=head2 Directory handles not copied to threads - -On systems that do not have a C function, newly-created threads no -longer inherit directory handles from their parent threads. Such programs -would probably have crashed anyway -L<[perl #75154]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=75154>. - -=head2 Negation treats strings differently from before - -The unary negation operator C<-> now treats strings that look like numbers -as numbers -L<[perl #57706]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=57706>. - -=head2 Negative zero - -Negative zero (-0.0), when converted to a string, now becomes "0" on all -platforms. It used to become "-0" on some, but "0" on others. - -If you still need to determine whether a zero is negative, use -C or the L module on CPAN. - =head1 Deprecations XXX Any deprecated features, syntax, modules etc. should be listed here. @@ -190,117 +122,34 @@ XXX =item * -C has been upgraded from version 0.42 to 0.44 - -=item * - -C has been upgraded from version 1.18 to 1.19. - -It no longer autovivifies the C<*CORE::GLOBAL::caller> glob, something it -started doing in 1.18, which was released with perl 5.13.4 -L<[perl #78082]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=78082> - -=item * - -C has been upgraded from version 2.128 to 2.129. +XXX What should the version be? -C no longer crashes with globs returned by C<*$io_ref> -L<[perl #72332]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=72332>. +C has been upgraded from 0.99 to ???. -=item * - -C has been upgraded from version 2.40 to 2.51. - -It is now safe to use this module in combination with threads. +It fixes deparsing of C followed by a variable with funny characters +(as permitted under the C pragma) +L<[perl #33752]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=33752>. =item * -C has been upgraded from version 1.02 to 1.03. +C has been upgraded from 1.16 to 1.17. -It allows patterns containing literal parentheses (they no longer need to -be escaped). On Windows, it no longer adds an extra F<./> to the file names -returned when the pattern is a relative glob with a drive specification, -like F -L<[perl #71712]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=71712>. +The algorithm used by C to look up names has been +rewritten to run faster +L<[perl #75448]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=75448>. =item * -C has been upgraded from version 1.17 to 1.18. - -It improves handling of backslashes on Windows, so that paths such as -F are no longer generated -L<[perl #71710]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=71710>. +C has been upgraded from 1.94_61 to 1.94_62 =item * -C has been upgraded from version 0.05 to 0.06 +C has been upgraded from 1.16 to 1.17 =item * -C has been upgraded from version 1.06 to 1.07. - -The internal C routine now knows how to handle file descriptors, as -documented, so duplicating STDIN in a child process using its file -descriptor now works -L<[perl #76474]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=71710>. - -=item * - -C has been upgraded from version 1.15 to 1.16. - -It fixes an infinite loop in C when -working with tainted values -(L). - -C<< ->maketext >> calls will now backup and restore C<$@> so that error -messages are not supressed -(L). - -=item * - -C has been upgraded from version 1.95 to 1.97. - -This prevents C from crashing under C -L<[perl #73534]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=73534>. - -=item * - -C has been upgraded from version 0.64 to 0.65. - -=item * - -C has been upgraded from version 1.10 to 1.11. - -C can now handle subroutines that are themselves blessed -into overloaded classes -L<[perl #71998]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=71998>. - -=item * - -C has been upgraded from version 3.31_01 to 3.34. - -=item * - -C has been upgraded from version 1.04 to 1.05. - -It no longer tries to modify read-only arguments when generating a -backtrace -L<[perl #72340]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=72340>. - -=item * - -C has been upgrade from version 1.77_03 to 1.81 - -=item * - -C has been upgraded from version 0.59 to 0.62 - -U::C::Locale newly supports locales: ar, de__phonebook, hu, hy, nso, om, -tn, vi, hr, ig, sq, se to and uk - -=item * - -C has been upgraded from version 1.06 to 1.07 +C has been upgraded from 0.13 to 0.14, for the sake of the new +C pragma. =back @@ -339,8 +188,7 @@ section. =item * -The documentation for the C macro was simply wrong in stating that -get-magic is not processed. It has been corrected. +XXX Description of the change here =back @@ -375,24 +223,7 @@ XXX Changes (i.e. rewording) of diagnostic messages go here =item * -The 'Layer does not match this perl' error message has been replaced with -these more helpful messages: - -=over 4 - -=item * - -PerlIO layer function table size (%d) does not match size expected by this -perl (%d) - -=item * - -PerlIO layer instance size (%d) does not match size expected by this perl -(%d) - -=back - -L<[perl #73754]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=73754> +XXX =back @@ -446,8 +277,7 @@ that they represent may be covered elsewhere. =item * -The script F has been added, which tests interaction -of threads and directory handles. +XXX =back @@ -494,35 +324,9 @@ L section. =over 4 -=item IRIX - -Conversion of strings to floating-point numbers is now more accurate on -IRIX systems -L<[perl #32380]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=32380>. - -=item Mac OS X - -Early versions of Mac OS X (Darwin) had buggy implementations of the -C, C, C and C functions, so perl -would pretend they did not exist. - -These functions are now recognised on Mac OS 10.5 (Leopard; Darwin 9) and -higher, as they have been fixed -L<[perl #72990]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=72990>. - -=item OpenVOS - -perl now builds again with OpenVOS (formerly known as Stratus VOS) -L<[perl #78132]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=78132>. - -=item Windows - -C<$Config{gccversion}> is now set correctly when perl is built using the -mingw64 compiler from L -L<[perl #73754]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=73754>. +=item XXX-some-platform -The build process proceeds more smoothly with mingw and dmake when -F is in the PATH, due to a C fix. +XXX =back @@ -538,39 +342,18 @@ be noted as well. =item * -See L, -above. - -=item * - -The C, C, C and -C functions have been added. These are like their -non-_flags counterparts, but allow one to specify whether get-magic is -processed. - -The C, C, C and C functions have -been replaced with wrappers around the new functions. +C has been added to the API, but is considered experimental. =item * -A new C function has been added. - -This is like C, but it lets the calling code decide whether -get-magic is handled. C is now a macro that calls the new -function. +A new C function has been added to the API +L<[perl #78222]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=78222>. =item * -A new macro, C, has been added. - -This is like C, except that it does not process magic. It uses the -new C function. - -=item * - -C no longer calls C on its second argument (the -source string) if the flags passed to it do not include SV_GMAGIC. So it -now matches what the documentation says it does. +A new, experimental API has been added for accessing the internal +structure that Perl uses for C<%^H>. See the functions beginning with +C in L. =back @@ -586,118 +369,34 @@ L. =item * -A regular expression match in the right-hand side of a global substitution -(C) that is in the same scope will no longer cause match variables -to have the wrong values on subsequent iterations. This can happen when an -array or hash subscript is interpolated in the right-hand side, as in -C -L<[perl #19078]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=19078>. - -=item * - -Constant-folding used to cause - - $text =~ ( 1 ? /phoo/ : /bear/) - -to turn into - - $text =~ /phoo/ - -at compile time. Now it correctly matches against C<$_> -L<[perl #20444]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=20444>. +The C C function added in earlier in the 5.13.x series has been +fixed to work with statements ending with C<}> +L<[perl #78222]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=78222>. =item * -Parsing Perl code (either with string C or by loading modules) from -within a C block no longer causes the interpreter to crash -L<[perl #70614]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=70614>. +The C C function added in 5.13.5 has been fixed to work +when called while an expression is being parsed. =item * -When C<-d> is used on the shebang (C<#!>) line, the debugger now has access -to the lines of the main program. In the past, this sometimes worked and -sometimes did not, depending on what order things happened to be arranged -in memory -L<[perl #71806]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=71806>. +Characters in the Latin-1 non-ASCII range (0x80 to 0xFF) used not to match +themselves if the string happened to be UTF8-encoded internally, the +regular expression was not, and the character in the regular expression was +inside a repeated group (e.g., +C) +L<[perl #78464]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=78464>. =item * -The C or C operator now calls get-magic (e.g., the C -method of a tie) on its left-hand side just once, not twice -L<[perl #76814]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=76814>. +The C<(?d)> regular expression construct now overrides a previous C<(?u)> +or C +L<[perl #78508]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=78508>. =item * -String comparison (C, C, C, C, C, C and -C) and logical not (C and C) operators no longer call magic -(e.g., tie methods) twice on their operands -L<[perl #76814]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=76814>. - -This bug was introduced in an earlier 5.13 release, and does not affect -perl 5.12. - -=item * - -When a tied (or other magic) variable is used as, or in, a regular -expression, it no longer has its C method called twice -L<[perl #76814]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=76814>. - -This bug was introduced in an earlier 5.13 release, and does not affect -perl 5.12. - -=item * - -The C<-C> command line option can now be followed by other options -L<[perl #72434]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=72434>. - -=item * - -Assigning a glob to a PVLV used to convert it to a plain string. Now it -works correctly, and a PVLV can hold a glob. This would happen when a -nonexistent hash or array element was passed to a subroutine: - - sub { $_[0] = *foo }->($hash{key}); - # $_[0] would have been the string "*main::foo" - -It also happened when a glob was assigned to, or returned from, an element -of a tied array or hash -L<[perl #36051]|http://rt.perl.org/rt3//Public/Bug/Display.html?id=36051>. - -=item * - -Creating a new thread when directory handles were open used to cause a -crash, because the handles were not cloned, but simply passed to the new -thread, resulting in a double free. - -Now directory handles are properly, on systems that have a C -function. On other systems, new threads simply do not inherit directory -handles from their parent threads -L<[perl #75154]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=75154>. - -=item * - -The regular expression parser no longer hangs when parsing C<\18> and -C<\88>. - -This bug was introduced in version 5.13.5 and did not affect earlier -versions -L<[perl #78058]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=78058>. - -=item * - -Subroutine redefinition works once more in the debugger -L<[perl #48332]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=48332>. - -=item * - -The C<&> C<|> C<^> bitwise operators no longer coerce read-only arguments -L<[perl #20661]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=20661>. - -=item * - -Stringifying a scalar containing -0.0 no longer has the affect of turning -false into true -L<[perl #45133]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=45133>. +A memory leak in C, introduced in perl 5.13.6, has been fixed +L<[perl #78488]|http://rt.perl.org/rt3/Public/Bug/Display.html?id=78488>. =back @@ -725,16 +424,6 @@ XXX XXX If any significant core contributor has died, we've added a short obituary here. -=head1 Errata - -=over 4 - -=item * - -Fixed a typo in L regarding array slices and smart matching - -=back - =head1 Acknowledgements XXX The list of people to thank goes here.