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1=head1 NAME
2
3perltodo - Perl TO-DO List
4
5=head1 DESCRIPTION
e50bb9a1 6
722d2a37 7This is a list of wishes for Perl. Send updates to
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8I<perl5-porters@perl.org>. If you want to work on any of these
9projects, be sure to check the perl5-porters archives for past ideas,
10flames, and propaganda. This will save you time and also prevent you
11from implementing something that Larry has already vetoed. One set
12of archives may be found at:
13
14 http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/
15
722d2a37 16=head1 To do during 5.6.x
e50bb9a1 17
722d2a37 18=head2 Support for I/O disciplines
e50bb9a1 19
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20C<perlio> provides this, but the interface could be a lot more
21straightforward.
e50bb9a1 22
4b3b956a 23=head2 Autoload bytes.pm
e50bb9a1 24
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25When the lexer sees, for instance, C<bytes::length>, it should
26automatically load the C<bytes> pragma.
27
28=head2 Make "\u{XXXX}" et al work
29
30Danger, Will Robinson! Discussing the semantics of C<"\x{F00}">,
31C<"\xF00"> and C<"\U{F00}"> on P5P I<will> lead to a long and boring
32flamewar.
e50bb9a1 33
c6287c21 34=head2 Create a char *sv_pvprintify(sv, STRLEN *lenp, UV flags)
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35
36For displaying PVs with control characters, embedded nulls, and Unicode.
37This would be useful for printing warnings, or data and regex dumping,
38not_a_number(), and so on.
39
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40Requirements: should handle both byte and UTF8 strings. isPRINT()
41characters printed as-is, character less than 256 as \xHH, Unicode
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42characters as \x{HHH}. Don't assume ASCII-like, either, get somebody
43on EBCDIC to test the output.
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44
45Possible options, controlled by the flags:
0661e9a4 46- whitespace (other than ' ' of isPRINT()) printed as-is
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47- use isPRINT_LC() instead of isPRINT()
48- print control characters like this: "\cA"
49- print control characters like this: "^A"
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50- non-PRINTables printed as '.' instead of \xHH
51- use \OOO instead of \xHH
52- use the C/Perl-metacharacters like \n, \t
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53- have a maximum length for the produced string (read it from *lenp)
54- append a "..." to the produced string if the maximum length is exceeded
0661e9a4 55- really fancy: print unicode characters as \N{...}
f35392ae 56
722d2a37 57=head2 Overloadable regex assertions
e50bb9a1 58
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59This may or may not be possible with the current regular expression
60engine. The idea is that, for instance, C<\b> needs to be
61algorithmically computed if you're dealing with Thai text. Hence, the
62B<\b> assertion wants to be overloaded by a function.
e50bb9a1 63
722d2a37 64=head2 Unicode case mappings
e50bb9a1 65
722d2a37 66 Case Mappings? http://www.unicode.org/unicode/reports/tr21/
e50bb9a1 67
722d2a37 68=head2 Unicode regular expression character classes
e50bb9a1 69
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70They have some tricks Perl doesn't yet implement like character
71class subtraction.
e50bb9a1 72
722d2a37 73 http://www.unicode.org/unicode/reports/tr18/
e50bb9a1 74
722d2a37 75=head2 use Thread for iThreads
e50bb9a1 76
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77Artur Bergman's C<iThreads> module is a start on this, but needs to
78be more mature.
e50bb9a1 79
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80=head2 make perl_clone optionally clone ops
81
82So that pseudoforking, mod_perl, iThreads and nvi will work properly
83(but not as efficiently) until the regex engine is fixed to be threadsafe.
84
722d2a37 85=head2 Work out exit/die semantics for threads
e50bb9a1 86
722d2a37 87=head2 Typed lexicals for compiler
e50bb9a1 88
722d2a37 89=head2 Compiler workarounds for Win32
e50bb9a1 90
722d2a37 91=head2 AUTOLOADing in the compiler
e50bb9a1 92
722d2a37 93=head2 Fixing comppadlist when compiling
e50bb9a1 94
722d2a37 95=head2 Cleaning up exported namespace
e50bb9a1 96
722d2a37 97=head2 Complete signal handling
e50bb9a1 98
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99Add C<PERL_ASYNC_CHECK> to opcodes which loop; replace C<sigsetjmp> with
100C<sigjmp>; check C<wait> for signal safety.
e50bb9a1 101
722d2a37 102=head2 Out-of-source builds
e50bb9a1 103
722d2a37 104This was done for 5.6.0, but needs reworking for 5.7.x
e50bb9a1 105
722d2a37 106=head2 POSIX realtime support
e50bb9a1 107
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108POSIX 1003.1 1996 Edition support--realtime stuff: POSIX semaphores,
109message queues, shared memory, realtime clocks, timers, signals (the
110metaconfig units mostly already exist for these)
e50bb9a1 111
722d2a37 112=head2 UNIX98 support
e50bb9a1 113
722d2a37 114Reader-writer locks, realtime/asynchronous IO
e50bb9a1 115
722d2a37 116=head2 IPv6 Support
e50bb9a1 117
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118There are non-core modules, such as C<Net::IPv6>, but these will need
119integrating when IPv6 actually starts to really happen. See RFC 2292
120and RFC 2553.
e50bb9a1 121
722d2a37 122=head2 Long double conversion
e50bb9a1 123
722d2a37 124Floating point formatting is still causing some weird test failures.
e50bb9a1 125
722d2a37 126=head2 Locales
e50bb9a1 127
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128Locales and Unicode interact with each other in unpleasant ways.
129One possible solution would be to adopt/support ICU:
e50bb9a1 130
722d2a37 131 http://oss.software.ibm.com/developerworks/opensource/icu/project/
e50bb9a1 132
722d2a37 133=head2 Thread-safe regexes
e50bb9a1 134
722d2a37 135The regular expression engine is currently non-threadsafe.
e50bb9a1 136
722d2a37 137=head2 Arithmetic on non-Arabic numerals
e50bb9a1 138
722d2a37 139C<[1234567890]> aren't the only numerals any more.
e50bb9a1 140
722d2a37 141=head2 POSIX Unicode character classes
e50bb9a1 142
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143([=a=] for equivalance classes, [.ch.] for collation.)
144These are dependent on Unicode normalization and collation.
e50bb9a1 145
722d2a37 146=head2 Factoring out common suffices/prefices in regexps (trie optimization)
c47ff5f1 147
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148Currently, the user has to optimize C<foo|far> and C<foo|goo> into
149C<f(?:oo|ar)> and C<[fg]oo> by hand; this could be done automatically.
e50bb9a1 150
722d2a37 151=head2 Security audit shipped utilities
e50bb9a1 152
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153All the code we ship with Perl needs to be sensible about temporary file
154handling, locking, input validation, and so on.
e50bb9a1 155
722d2a37 156=head2 Custom opcodes
e50bb9a1 157
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158Have a way to introduce user-defined opcodes without the subroutine call
159overhead of an XSUB; the user should be able to create PP code. Simon
160Cozens has some ideas on this.
e50bb9a1 161
722d2a37 162=head2 spawnvp() on Win32
e50bb9a1 163
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164Win32 has problems spawning processes, particularly when the arguments
165to the child process contain spaces, quotes or tab characters.
e50bb9a1 166
722d2a37 167=head2 DLL Versioning
e50bb9a1 168
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169Windows needs a way to know what version of a XS or C<libperl> DLL it's
170loading.
e50bb9a1 171
722d2a37 172=head2 Introduce @( and @)
e50bb9a1 173
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174C<$(> may return "foo bar baz". Unfortunately, since groups can
175theoretically have spaces in their names, this could be one, two or
176three groups.
e50bb9a1 177
722d2a37 178=head2 Floating point handling
e50bb9a1 179
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180C<NaN> and C<inf> support is particularly troublesome.
181(fp_classify(), fp_class(), fp_class_d(), class(), isinf(),
182isfinite(), finite(), isnormal(), unordered(), <ieeefp.h>,
183<fp_class.h> (there are metaconfig units for all these) (I think),
184fp_setmask(), fp_getmask(), fp_setround(), fp_getround()
185(no metaconfig units yet for these). Don't forget finitel(), fp_classl(),
186fp_class_l(), (yes, both do, unfortunately, exist), and unorderedl().)
e50bb9a1 187
722d2a37 188As of Perl 5.6.1 is a Perl macro, Perl_isnan().
e50bb9a1 189
722d2a37 190=head2 IV/UV preservation
e50bb9a1 191
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192Nicholas Clark has done a lot of work on this, but work is continuing.
193C<+>, C<-> and C<*> work, but guards need to be in place for C<%>, C</>,
194C<&>, C<oct>, C<hex> and C<pack>.
e50bb9a1 195
722d2a37 196=head2 Replace pod2html with something using Pod::Parser
83df6a1d 197
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198The CPAN module C<Malik::Pod::Html> may be a more suitable basis for a
199C<pod2html> convertor; the current one duplicates the functionality
200abstracted in C<Pod::Parser>, which makes updating the POD language
201difficult.
e50bb9a1 202
722d2a37 203=head2 Automate module testing on CPAN
e50bb9a1 204
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205When a new Perl is being beta tested, porters have to manually grab
206their favourite CPAN modules and test them - this should be done
207automatically.
e50bb9a1 208
722d2a37 209=head2 sendmsg and recvmsg
83df6a1d 210
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211We have all the other BSD socket functions but these. There are
212metaconfig units for these functions which can be added. To avoid these
213being new opcodes, a solution similar to the way C<sockatmark> was added
214would be preferable. (Autoload the C<IO::whatever> module.)
e50bb9a1 215
722d2a37 216=head2 Rewrite perlre documentation
e50bb9a1 217
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218The new-style patterns need full documentation, and the whole document
219needs to be a lot clearer.
e50bb9a1 220
722d2a37 221=head2 Convert example code to IO::Handle filehandles
e50bb9a1 222
722d2a37 223=head2 Document Win32 choices
e50bb9a1 224
722d2a37 225=head2 Check new modules
e50bb9a1 226
722d2a37 227=head2 Make roffitall find pods and libs itself
e50bb9a1 228
722d2a37 229Simon Cozens has done some work on this but it needs a rethink.
e50bb9a1 230
722d2a37 231=head1 To do at some point
e50bb9a1 232
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233These are ideas that have been regularly tossed around, that most
234people believe should be done maybe during 5.8.x
e50bb9a1 235
722d2a37 236=head2 Remove regular expression recursion
e50bb9a1 237
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238Because the regular expression engine is recursive, badly designed
239expressions can lead to lots of recursion filling up the stack. Ilya
240claims that it is easy to convert the engine to being iterative, but
241this has still not yet been done. There may be a regular expression
242engine hit squad meeting at TPC5.
e50bb9a1 243
722d2a37 244=head2 Memory leaks after failed eval
e50bb9a1 245
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246Perl will leak memory if you C<eval "hlagh hlagh hlagh hlagh">. This is
247partially because it attempts to build up an op tree for that code and
248doesn't properly free it. The same goes for non-syntactically-correct
249regular expressions. Hugo looked into this, but decided it needed a
250mark-and-sweep GC implementation.
e50bb9a1 251
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252Alan notes that: The basic idea was to extend the parser token stack
253(C<YYSTYPE>) to include a type field so we knew what sort of thing each
254element of the stack was. The F<<perly.c> code would then have to be
255postprocessed to record the type of each entry on the stack as it was
256created, and the parser patched so that it could unroll the stack
257properly on error.
e50bb9a1 258
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259This is possible to do, but would be pretty messy to implement, as it
260would rely on even more sed hackery in F<perly.fixer>.
e50bb9a1 261
722d2a37 262=head2 pack "(stuff)*"
e50bb9a1 263
722d2a37 264That's to say, C<pack "(sI)40"> would be the same as C<pack "sI"x40>
e50bb9a1 265
722d2a37 266=head2 bitfields in pack
e50bb9a1 267
722d2a37 268=head2 Cross compilation
e50bb9a1 269
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270Make Perl buildable with a cross-compiler. This will play havoc with
271Configure, which needs to how how the target system will respond to
272its tests; maybe C<microperl> will be a good starting point here.
273(Indeed, Bart Schuller reports that he compiled up C<microperl> for
274the Agenda PDA and it works fine.) A really big spanner in the works
275is the bootstrapping build process of Perl: if the filesystem the
276target systems sees is not the same what the build host sees, various
277input, output, and (Perl) library files need to be copied back and forth.
e50bb9a1 278
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279As of 5.8.0 Configure mostly works for cross-compilation
280(used successfully for iPAQ Linux), miniperl gets built,
281but then building DynaLoader (and other extensions) fails
282since MakeMaker knows nothing of cross-compilation.
283(See INSTALL/Cross-compilation for the state of things.)
284
722d2a37 285=head2 Perl preprocessor / macros
e50bb9a1 286
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287Source filters help with this, but do not get us all the way. For
288instance, it should be possible to implement the C<??> operator somehow;
289source filters don't (quite) cut it.
e50bb9a1 290
722d2a37 291=head2 Perl lexer in Perl
a45bd81d 292
722d2a37 293Damian Conway is planning to work on this, but it hasn't happened yet.
e50bb9a1 294
722d2a37 295=head2 Using POSIX calls internally
e50bb9a1 296
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297When faced with a BSD vs. SySV -style interface to some library or
298system function, perl's roots show in that it typically prefers the BSD
299interface (but falls back to the SysV one). One example is getpgrp().
300Other examples include C<memcpy> vs. C<bcopy>. There are others, mostly in
301F<<pp_sys.c>.
e50bb9a1 302
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303Mostly, this item is a suggestion for which way to start a journey into
304an C<#ifdef> forest. It is not primarily a suggestion to eliminate any of
305the C<#ifdef> forests.
e50bb9a1 306
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307POSIX calls are perhaps more likely to be portable to unexpected
308architectures. They are also perhaps more likely to be actively
309maintained by a current vendor. They are also perhaps more likely to be
310available in thread-safe versions, if appropriate.
e50bb9a1 311
722d2a37 312=head2 -i rename file when changed
e50bb9a1 313
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314It's only necessary to rename a file when inplace editing when the file
315has changed. Detecting a change is perhaps the difficult bit.
e50bb9a1 316
722d2a37 317=head2 All ARGV input should act like E<lt>E<gt>
e50bb9a1 318
722d2a37 319=head2 Support for rerunning debugger
e50bb9a1 320
722d2a37 321There should be a way of restarting the debugger on demand.
e50bb9a1 322
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323=head2 Test Suite for the Debugger
324
325The debugger is a complex piece of software and fixing something
326here may inadvertently break something else over there. To tame
327this chaotic behaviour, a test suite is necessary.
328
722d2a37 329=head2 my sub foo { }
c47ff5f1 330
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331The basic principle is sound, but there are problems with the semantics
332of self-referential and mutually referential lexical subs: how to
333declare the subs?
c47ff5f1 334
722d2a37 335=head2 One-pass global destruction
c47ff5f1 336
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337Sweeping away all the allocated memory in one go is a laudable goal, but
338it's difficult and in most cases, it's easier to let the memory get
339freed by exiting.
e50bb9a1 340
722d2a37 341=head2 Rewrite regexp parser
e50bb9a1 342
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343There has been talk recently of rewriting the regular expression parser
344to produce an optree instead of a chain of opcodes; it's unclear whether
345or not this would be a win.
e50bb9a1 346
722d2a37 347=head2 Cache recently used regexps
e50bb9a1 348
722d2a37 349This is to speed up
e50bb9a1 350
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351 for my $re (@regexps) {
352 $matched++ if /$re/
353 }
e50bb9a1 354
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355C<qr//> already gives us a way of saving compiled regexps, but it should
356be done automatically.
e50bb9a1 357
722d2a37 358=head2 Re-entrant functions
e50bb9a1 359
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360Add configure probes for C<_r> forms of system calls and fit them to the
361core. Unfortunately, calling conventions for these functions and not
362standardised.
04c70446 363
722d2a37 364=head2 Cross-compilation support
04c70446 365
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366Bart Schuller reports that using C<microperl> and a cross-compiler, he
367got Perl working on the Agenda PDA. However, one cannot build a full
368Perl because Configure needs to get the results for the target platform,
369for the host.
e50bb9a1 370
722d2a37 371=head2 Bit-shifting bitvectors
e50bb9a1 372
722d2a37 373Given:
e50bb9a1 374
722d2a37 375 vec($v, 1000, 1) = 1;
e50bb9a1 376
722d2a37 377One should be able to do
e50bb9a1 378
722d2a37 379 $v <<= 1;
e50bb9a1 380
722d2a37 381and have the 999'th bit set.
e50bb9a1 382
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383Currently if you try with shift bitvectors you shift the NV/UV, instead
384of the bits in the PV. Not very logical.
e50bb9a1 385
722d2a37 386=head2 debugger pragma
e50bb9a1 387
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388The debugger is implemented in Perl in F<perl5db.pl>; turning it into a
389pragma should be easy, but making it work lexically might be more
390difficult. Fiddling with C<$^P> would be necessary.
e50bb9a1 391
722d2a37 392=head2 use less pragma
e50bb9a1 393
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394Identify areas where speed/memory tradeoffs can be made and have a hint
395to switch between them.
e50bb9a1 396
722d2a37 397=head2 switch structures
e50bb9a1 398
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399Although we have C<Switch.pm> in core, Larry points to the dormant
400C<nswitch> and C<cswitch> ops in F<pp.c>; using these opcodes would be
401much faster.
e50bb9a1 402
722d2a37 403=head2 Cache eval tree
e50bb9a1 404
722d2a37 405=head2 rcatmaybe
e50bb9a1 406
722d2a37 407=head2 Shrink opcode tables
e50bb9a1 408
722d2a37 409=head2 Optimize away @_
e50bb9a1 410
722d2a37 411Look at the "reification" code in C<av.c>
e50bb9a1 412
722d2a37 413=head2 Prototypes versus indirect objects
e50bb9a1 414
722d2a37 415Currently, indirect object syntax bypasses prototype checks.
e50bb9a1 416
722d2a37 417=head2 Install HMTL
e50bb9a1 418
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419HTML versions of the documentation need to be installed by default; a
420call to C<installhtml> from C<installperl> may be all that's necessary.
e50bb9a1 421
722d2a37 422=head2 Prototype method calls
e50bb9a1 423
722d2a37 424=head2 Return context prototype declarations
e50bb9a1 425
722d2a37 426=head2 magic_setisa
e50bb9a1 427
722d2a37 428=head2 Garbage collection
e50bb9a1 429
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430There have been persistent mumblings about putting a mark-and-sweep
431garbage detector into Perl; Alan Burlison has some ideas about this.
e50bb9a1 432
722d2a37 433=head2 IO tutorial
e50bb9a1 434
722d2a37 435Mark-Jason Dominus has the beginnings of one of these.
e50bb9a1 436
722d2a37 437=head2 pack/unpack tutorial
e50bb9a1 438
722d2a37 439Simon Cozens has the beginnings of one of these.
e50bb9a1 440
722d2a37 441=head2 Rewrite perldoc
e50bb9a1 442
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443There are a few suggestions for what to do with C<perldoc>: maybe a
444full-text search, an index function, locating pages on a particular
445high-level subject, and so on.
e50bb9a1 446
3958b146 447=head2 Install .3p manpages
e50bb9a1 448
3958b146 449This is a bone of contention; we can create C<.3p> manpages for each
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450built-in function, but should we install them by default? Tcl does this,
451and it clutters up C<apropos>.
e50bb9a1 452
722d2a37 453=head2 Unicode tutorial
e50bb9a1 454
722d2a37 455Simon Cozens promises to do this before he gets old.
e50bb9a1 456
722d2a37 457=head2 Update POSIX.pm for 1003.1-2
3958b146 458
722d2a37 459=head2 Retargetable installation
e50bb9a1 460
722d2a37 461Allow C<@INC> to be changed after Perl is built.
e50bb9a1 462
722d2a37 463=head2 POSIX emulation on non-POSIX systems
e50bb9a1 464
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465Make C<POSIX.pm> behave as POSIXly as possible everywhere, meaning we
466have to implement POSIX equivalents for some functions if necessary.
e50bb9a1 467
722d2a37 468=head2 Rename Win32 headers
e50bb9a1 469
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470=head2 Finish off lvalue functions
471
472They don't work in the debugger, and they don't work for list or hash
473slices.
e50bb9a1 474
722d2a37 475=head2 Update sprintf documentation
e50bb9a1 476
722d2a37 477Hugo van der Sanden plans to look at this.
e50bb9a1 478
722d2a37 479=head2 Use fchown/fchmod internally
e50bb9a1 480
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481This has been done in places, but needs a thorough code review.
482Also fchdir is available in some platforms.
e50bb9a1 483
722d2a37 484=head1 Vague ideas
e50bb9a1 485
722d2a37 486Ideas which have been discussed, and which may or may not happen.
e50bb9a1 487
722d2a37 488=head2 ref() in list context
e50bb9a1 489
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490It's unclear what this should do or how to do it without breaking old
491code.
e50bb9a1 492
f86a8bc5 493=head2 Make tr/// return histogram of characters in list context
e50bb9a1 494
722d2a37 495There is a patch for this, but it may require Unicodification.
e50bb9a1 496
722d2a37 497=head2 Compile to real threaded code
3958b146 498
722d2a37 499=head2 Structured types
3958b146 500
722d2a37 501=head2 Modifiable $1 et al.
e50bb9a1 502
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503 ($x = "elephant") =~ /e(ph)/;
504 $1 = "g"; # $x = "elegant"
e50bb9a1 505
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506What happens if there are multiple (nested?) brackets? What if the
507string changes between the match and the assignment?
e50bb9a1 508
722d2a37 509=head2 Procedural interfaces for IO::*, etc.
e50bb9a1 510
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511Some core modules have been accused of being overly-OO. Adding
512procedural interfaces could demystify them.
e50bb9a1 513
722d2a37 514=head2 RPC modules
e50bb9a1 515
722d2a37 516=head2 Attach/detach debugger from running program
e50bb9a1 517
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518With C<gdb>, you can attach the debugger to a running program if you
519pass the process ID. It would be good to do this with the Perl debugger
520on a running Perl program, although I'm not sure how it would be done.
e50bb9a1 521
722d2a37 522=head2 Alternative RE syntax module
e50bb9a1 523
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524 use Regex::Newbie;
525 $re = Regex::Newbie->new
526 ->start
527 ->match("foo")
528 ->repeat(Regex::Newbie->class("char"),3)
529 ->end;
530 /$re/;
e50bb9a1 531
722d2a37 532=head2 GUI::Native
e50bb9a1 533
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534A non-core module that would use "native" GUI to create graphical
535applications.
e50bb9a1 536
722d2a37 537=head2 foreach(reverse ...)
e50bb9a1 538
722d2a37 539Currently
e50bb9a1 540
722d2a37 541 foreach (reverse @_) { ... }
e50bb9a1 542
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543puts C<@_> on the stack, reverses it putting the reversed version on the
544stack, then iterates forwards. Instead, it could be special-cased to put
545C<@_> on the stack then iterate backwards.
e50bb9a1 546
722d2a37 547=head2 Constant function cache
e50bb9a1 548
722d2a37 549=head2 Approximate regular expression matching
e50bb9a1 550
722d2a37 551=head1 Ongoing
e50bb9a1 552
722d2a37 553These items B<always> need doing:
e50bb9a1 554
722d2a37 555=head2 Update guts documentation
e50bb9a1 556
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557Simon Cozens tries to do this when possible, and contributions to the
558C<perlapi> documentation is welcome.
e50bb9a1 559
722d2a37 560=head2 Add more tests
e50bb9a1 561
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562Michael Schwern will donate $500 to Yet Another Society when all core
563modules have tests.
e50bb9a1 564
722d2a37 565=head2 Update auxiliary tools
e50bb9a1 566
722d2a37 567The code we ship with Perl should look like good Perl 5.
e50bb9a1 568
722d2a37 569=head1 Recently done things
e50bb9a1 570
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571These are things which have been on the todo lists in previous releases
572but have recently been completed.
e50bb9a1 573
722d2a37 574=head2 Safe signal handling
e50bb9a1 575
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576A new signal model went into 5.7.1 without much fanfare. Operations and
577C<malloc>s are no longer interrupted by signals, which are handled
578between opcodes. This means that C<PERL_ASYNC_CHECK> now actually does
579something. However, there are still a few things that need to be done.
e50bb9a1 580
722d2a37 581=head2 Tie Modules
e50bb9a1 582
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583Modules which implement arrays in terms of strings, substrings or files
584can be found on the CPAN.
e50bb9a1 585
722d2a37 586=head2 gettimeofday
e50bb9a1 587
722d2a37 588C<Time::Hires> has been integrated into the core.
e50bb9a1 589
722d2a37 590=head2 setitimer and getimiter
e50bb9a1 591
722d2a37 592Adding C<Time::Hires> got us this too.
e50bb9a1 593
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594=head2 Testing __DIE__ hook
595
596Tests have been added.
597
598=head2 CPP equivalent in Perl
e50bb9a1 599
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600A C Yardley will probably have done this by the time you can read this.
601This allows for a generalization of the C constant detection used in
602building C<Errno.pm>.
e50bb9a1 603
722d2a37 604=head2 Explicit switch statements
e50bb9a1 605
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606C<Switch.pm> has been integrated into the core to give you all manner of
607C<switch...case> semantics.
e50bb9a1 608
722d2a37 609=head2 autocroak
e50bb9a1 610
722d2a37 611This is C<Fatal.pm>.
e50bb9a1 612
722d2a37 613=head2 UTF/EBCDIC
e50bb9a1 614
722d2a37 615Nick Ing-Simmons has made UTF-EBCDIC (UTR13) work with Perl.
e50bb9a1 616
722d2a37 617 EBCDIC? http://www.unicode.org/unicode/reports/tr16/
e50bb9a1 618
722d2a37 619=head2 UTF Regexes
e50bb9a1 620
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621Although there are probably some small bugs to be rooted out, Jarkko
622Hietaniemi has made regular expressions polymorphic between bytes and
623characters.
e50bb9a1 624
722d2a37 625=head2 perlcc to produce executable
e50bb9a1 626
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627C<perlcc> was recently rewritten, and can now produce standalone
628executables.
e50bb9a1 629
722d2a37 630=head2 END blocks saved in compiled output
e50bb9a1 631
722d2a37 632=head2 Secure temporary file module
e50bb9a1 633
722d2a37 634Tim Jenness' C<File::Temp> is now in core.
e50bb9a1 635
722d2a37 636=head2 Integrate Time::HiRes
e50bb9a1 637
722d2a37 638This module is now part of core.
e50bb9a1 639
722d2a37 640=head2 Turn Cwd into XS
e50bb9a1 641
722d2a37 642Benjamin Sugars has done this.
e50bb9a1 643
722d2a37 644=head2 Mmap for input
e50bb9a1 645
722d2a37 646Nick Ing-Simmons' C<perlio> supports an C<mmap> IO method.
e50bb9a1 647
722d2a37 648=head2 Byte to/from UTF8 and UTF8 to/from local conversion
e50bb9a1 649
722d2a37 650C<Encode> provides this.
e50bb9a1 651
722d2a37 652=head2 Add sockatmark support
e50bb9a1 653
722d2a37 654Added in 5.7.1
e50bb9a1 655
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656=head2 Mailing list archives
657
658http://lists.perl.org/, http://archive.develooper.com/
659
660=head2 Bug tracking
661
662Richard Foley has written the bug tracking system at http://bugs.perl.org/
e50bb9a1 663
722d2a37 664=head2 Integrate MacPerl
e50bb9a1 665
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666Chris Nandor and Matthias Neeracher have integrated the MacPerl changes
667into 5.6.0.
e50bb9a1 668
722d2a37 669=head2 Web "nerve center" for Perl
e50bb9a1 670
722d2a37 671http://use.perl.org/ is what you're looking for.
e50bb9a1 672
722d2a37 673=head2 Regular expression tutorial
e50bb9a1 674
722d2a37 675C<perlretut>, provided by Mark Kvale.
e50bb9a1 676
722d2a37 677=head2 Debugging Tutorial
e50bb9a1 678
722d2a37 679C<perldebtut>, written by Richard Foley.
e50bb9a1 680
722d2a37 681=head2 Integrate new modules
e50bb9a1 682
722d2a37 683Jarkko has been integrating madly into 5.7.x
e50bb9a1 684
722d2a37 685=head2 Integrate profiler
e50bb9a1 686
722d2a37 687C<Devel::DProf> is now a core module.
e50bb9a1 688
722d2a37 689=head2 Y2K error detection
e50bb9a1 690
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691There's a configure option to detect unsafe concatenation with "19", and
692a CPAN module. (C<D'oh::Year>)
e50bb9a1 693
722d2a37 694=head2 Regular expression debugger
e50bb9a1 695
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696While not part of core, Mark-Jason Dominus has written C<Rx> and has
697also come up with a generalised strategy for regular expression
698debugging.
e50bb9a1 699
722d2a37 700=head2 POD checker
e50bb9a1 701
722d2a37 702That's, uh, F<podchecker>
e50bb9a1 703
722d2a37 704=head2 "Dynamic" lexicals
e50bb9a1 705
722d2a37 706=head2 Cache precompiled modules
e50bb9a1 707
722d2a37 708=head1 Deprecated Wishes
e50bb9a1 709
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710These are items which used to be in the todo file, but have been
711deprecated for some reason.
e50bb9a1 712
722d2a37 713=head2 Loop control on do{}
e50bb9a1 714
722d2a37 715This would break old code; use C<do{{ }}> instead.
e50bb9a1 716
722d2a37 717=head2 Lexically scoped typeglobs
e50bb9a1 718
722d2a37 719Not needed now we have lexical IO handles.
e50bb9a1 720
722d2a37 721=head2 format BOTTOM
3958b146 722
722d2a37 723=head2 report HANDLE
e50bb9a1 724
722d2a37 725Damian Conway's text formatting modules seem to be the Way To Go.
e50bb9a1 726
722d2a37 727=head2 Generalised want()/caller())
3958b146 728
722d2a37 729=head2 Named prototypes
e50bb9a1 730
722d2a37 731These both seem to be delayed until Perl 6.
e50bb9a1 732
722d2a37 733=head2 Built-in globbing
e50bb9a1 734
722d2a37 735The C<File::Glob> module has been used to replace the C<glob> function.
e50bb9a1 736
722d2a37 737=head2 Regression tests for suidperl
e50bb9a1 738
722d2a37 739C<suidperl> is deprecated in favour of common sense.
e50bb9a1 740
722d2a37 741=head2 Cached hash values
e50bb9a1 742
722d2a37 743We have shared hash keys, which perform the same job.
e50bb9a1 744
722d2a37 745=head2 Add compression modules
e50bb9a1 746
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747The compression modules are a little heavy; meanwhile, Nick Clark is
748working on experimental pragmata to do transparent decompression on
749input.
e50bb9a1 750
722d2a37 751=head2 Reorganise documentation into tutorials/references
e50bb9a1 752
722d2a37 753Could not get consensus on P5P about this.
e50bb9a1 754
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755=head2 Remove distinction between functions and operators
756
757Caution: highly flammable.
758
759=head2 Make XS easier to use
e50bb9a1 760
722d2a37 761Use C<Inline> instead, or SWIG.
e50bb9a1 762
722d2a37 763=head2 Make embedding easier to use
e50bb9a1 764
722d2a37 765Use C<Inline::CPR>.
e50bb9a1 766
722d2a37 767=head2 man for perl
04c70446 768
722d2a37 769See the Perl Power Tools. (http://language.perl.com/ppt/)
04c70446 770
722d2a37 771=head2 my $Package::variable
04c70446 772
722d2a37 773Use C<our> instead.
04c70446 774
722d2a37 775=head2 "or" tests defined, not truth
04c70446 776
722d2a37 777Suggesting this on P5P B<will> cause a boring and interminable flamewar.
04c70446 778
722d2a37 779=head2 "class"-based lexicals
04c70446 780
cbb3fa72 781Use flyweight objects, secure hashes or, dare I say it, pseudo-hashes instead.
f86a8bc5 782(Or whatever will replace pseudohashes in 5.10.)
04c70446 783
722d2a37 784=head2 byteperl
04c70446 785
722d2a37 786C<ByteLoader> covers this.
04c70446 787
722d2a37 788=head2 Lazy evaluation / tail recursion removal
04c70446 789
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790C<List::Util> gives first() (a short-circuiting grep); tail recursion
791removal is done manually, with C<goto &whoami;>. (However, MJD has
792found that C<goto &whoami> introduces a performance penalty, so maybe
793there should be a way to do this after all: C<sub foo {START: ... goto
794START;> is better.)
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795
796=head2 Make "use utf8" the default
797
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798Because of backward compatibility this is difficult: scripts could not
799contain B<any legacy eight-bit data> (like Latin-1) anymore, even in
800string literals or pod. Also would introduce a measurable slowdown of
801at least few percentages since all regular expression operations would
802be done in full UTF-8. But if you want to try this, add
803-DUSE_UTF8_SCRIPTS to your compilation flags.
804
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805=head2 Unicode collation and normalization
806
807The Unicode::Collate and Unicode::Normalize modules
808by SADAHIRO Tomoyuki have been included since 5.8.0.
809
810 Collation? http://www.unicode.org/unicode/reports/tr10/
811 Normalization? http://www.unicode.org/unicode/reports/tr15/
0562c0e3 812
3298bd4d 813=cut