lib/perl5/5.6.1/AutoSplit.pm

   1 package AutoSplit;
   2
   3 use 5.005_64;
   4 use Exporter ();
   5 use Config qw(%Config);
   6 use Carp qw(carp);
   7 use File::Basename ();
   8 use File::Path qw(mkpath);
   9 use File::Spec::Functions qw(curdir catfile);
  10 use strict;
  11 our($VERSION, @ISA, @EXPORT, @EXPORT_OK, $Verbose, $Keep, $Maxlen,
  12     $CheckForAutoloader, $CheckModTime);
  13
  14 $VERSION = "1.0305";
  15 @ISA = qw(Exporter);
  16 @EXPORT = qw(&autosplit &autosplit_lib_modules);
  17 @EXPORT_OK = qw($Verbose $Keep $Maxlen $CheckForAutoloader $CheckModTime);
  18
  19 =head1 NAME
  20
  21 AutoSplit - split a package for autoloading
  22
  23 =head1 SYNOPSIS
  24
  25  autosplit($file, $dir, $keep, $check, $modtime);
  26
  27  autosplit_lib_modules(@modules);
  28
  29 =head1 DESCRIPTION
  30
  31 This function will split up your program into files that the AutoLoader
  32 module can handle. It is used by both the standard perl libraries and by
  33 the MakeMaker utility, to automatically configure libraries for autoloading.
  34
  35 The C<autosplit> interface splits the specified file into a hierarchy
  36 rooted at the directory C<$dir>. It creates directories as needed to reflect
  37 class hierarchy, and creates the file F<autosplit.ix>. This file acts as
  38 both forward declaration of all package routines, and as timestamp for the
  39 last update of the hierarchy.
  40
  41 The remaining three arguments to C<autosplit> govern other options to
  42 the autosplitter.
  43
  44 =over 2
  45
  46 =item $keep
  47
  48 If the third argument, I<$keep>, is false, then any
  49 pre-existing C<*.al> files in the autoload directory are removed if
  50 they are no longer part of the module (obsoleted functions).
  51 $keep defaults to 0.
  52
  53 =item $check
  54
  55 The
  56 fourth argument, I<$check>, instructs C<autosplit> to check the module
  57 currently being split to ensure that it does include a C<use>
  58 specification for the AutoLoader module, and skips the module if
  59 AutoLoader is not detected.
  60 $check defaults to 1.
  61
  62 =item $modtime
  63
  64 Lastly, the I<$modtime> argument specifies
  65 that C<autosplit> is to check the modification time of the module
  66 against that of the C<autosplit.ix> file, and only split the module if
  67 it is newer.
  68 $modtime defaults to 1.
  69
  70 =back
  71
  72 Typical use of AutoSplit in the perl MakeMaker utility is via the command-line
  73 with:
  74
  75  perl -e 'use AutoSplit; autosplit($ARGV[0], $ARGV[1], 0, 1, 1)'
  76
  77 Defined as a Make macro, it is invoked with file and directory arguments;
  78 C<autosplit> will split the specified file into the specified directory and
  79 delete obsolete C<.al> files, after checking first that the module does use
  80 the AutoLoader, and ensuring that the module is not already currently split
  81 in its current form (the modtime test).
  82
  83 The C<autosplit_lib_modules> form is used in the building of perl. It takes
  84 as input a list of files (modules) that are assumed to reside in a directory
  85 B<lib> relative to the current directory. Each file is sent to the
  86 autosplitter one at a time, to be split into the directory B<lib/auto>.
  87
  88 In both usages of the autosplitter, only subroutines defined following the
  89 perl I<__END__> token are split out into separate files. Some
  90 routines may be placed prior to this marker to force their immediate loading
  91 and parsing.
  92
  93 =head2 Multiple packages
  94
  95 As of version 1.01 of the AutoSplit module it is possible to have
  96 multiple packages within a single file. Both of the following cases
  97 are supported:
  98
  99    package NAME;
 100    __END__
 101    sub AAA { ... }
 102    package NAME::option1;
 103    sub BBB { ... }
 104    package NAME::option2;
 105    sub BBB { ... }
 106
 107    package NAME;
 108    __END__
 109    sub AAA { ... }
 110    sub NAME::option1::BBB { ... }
 111    sub NAME::option2::BBB { ... }
 112
 113 =head1 DIAGNOSTICS
 114
 115 C<AutoSplit> will inform the user if it is necessary to create the
 116 top-level directory specified in the invocation. It is preferred that
 117 the script or installation process that invokes C<AutoSplit> have
 118 created the full directory path ahead of time. This warning may
 119 indicate that the module is being split into an incorrect path.
 120
 121 C<AutoSplit> will warn the user of all subroutines whose name causes
 122 potential file naming conflicts on machines with drastically limited
 123 (8 characters or less) file name length. Since the subroutine name is
 124 used as the file name, these warnings can aid in portability to such
 125 systems.
 126
 127 Warnings are issued and the file skipped if C<AutoSplit> cannot locate
 128 either the I<__END__> marker or a "package Name;"-style specification.
 129
 130 C<AutoSplit> will also emit general diagnostics for inability to
 131 create directories or files.
 132
 133 =cut
 134
 135 # for portability warn about names longer than $maxlen
 136 $Maxlen  = 8;   # 8 for dos, 11 (14-".al") for SYSVR3
 137 $Verbose = 1;   # 0=none, 1=minimal, 2=list .al files
 138 $Keep    = 0;
 139 $CheckForAutoloader = 1;
 140 $CheckModTime = 1;
 141
 142 my $IndexFile = "autosplit.ix"; # file also serves as timestamp
 143 my $maxflen = 255;
 144 $maxflen = 14 if $Config{'d_flexfnam'} ne 'define';
 145 if (defined (&Dos::UseLFN)) {
 146      $maxflen = Dos::UseLFN() ? 255 : 11;
 147 }
 148 my $Is_VMS = ($^O eq 'VMS');
 149
 150 # allow checking for valid ': attrlist' attachments
 151 my $nested;
 152 $nested = qr{ \( (?: (?> [^()]+ ) | (??{ $nested }) )* \) }x;
 153 my $one_attr = qr{ (?> (?! \d) \w+ (?:$nested)? ) (?:\s*\:\s*|\s+(?!\:)) }x;
 154 my $attr_list = qr{ \s* : \s* (?: $one_attr )* }x;
 155
 156
 157
 158 sub autosplit{
 159     my($file, $autodir,  $keep, $ckal, $ckmt) = @_;
 160     # $file    - the perl source file to be split (after __END__)
 161     # $autodir - the ".../auto" dir below which to write split subs
 162     # Handle optional flags:
 163     $keep = $Keep unless defined $keep;
 164     $ckal = $CheckForAutoloader unless defined $ckal;
 165     $ckmt = $CheckModTime unless defined $ckmt;
 166     autosplit_file($file, $autodir, $keep, $ckal, $ckmt);
 167 }
 168
 169
 170 # This function is used during perl building/installation
 171 # ./miniperl -e 'use AutoSplit; autosplit_lib_modules(@ARGV)' ...
 172
 173 sub autosplit_lib_modules{
 174     my(@modules) = @_; # list of Module names
 175
 176     while(defined($_ = shift @modules)){
 177         while (m#(.*?[^:])::([^:].*)#) { # in case specified as ABC::XYZ
 178             $_ = catfile($1, $2);
 179         }
 180         s|\\|/|g;               # bug in ksh OS/2
 181         s#^lib/##s; # incase specified as lib/*.pm
 182         my($lib) = catfile(curdir(), "lib");
 183         if ($Is_VMS) { # may need to convert VMS-style filespecs
 184             $lib =~ s#^\[\]#.\/#;
 185         }
 186         s#^$lib\W+##s; # incase specified as ./lib/*.pm
 187         if ($Is_VMS && /[:>\]]/) { # may need to convert VMS-style filespecs
 188             my ($dir,$name) = (/(.*])(.*)/s);
 189             $dir =~ s/.*lib[\.\]]//s;
 190             $dir =~ s#[\.\]]#/#g;
 191             $_ = $dir . $name;
 192         }
 193         autosplit_file(catfile($lib, $_), catfile($lib, "auto"),
 194                        $Keep, $CheckForAutoloader, $CheckModTime);
 195     }
 196     0;
 197 }
 198
 199
 200 # private functions
 201
 202 sub autosplit_file {
 203     my($filename, $autodir, $keep, $check_for_autoloader, $check_mod_time)
 204         = @_;
 205     my(@outfiles);
 206     local($_);
 207     local($/) = "\n";
 208
 209     # where to write output files
 210     $autodir ||= catfile(curdir(), "lib", "auto");
 211     if ($Is_VMS) {
 212         ($autodir = VMS::Filespec::unixpath($autodir)) =~ s|/\z||;
 213         $filename = VMS::Filespec::unixify($filename); # may have dirs
 214     }
 215     unless (-d $autodir){
 216         mkpath($autodir,0,0755);
 217         # We should never need to create the auto dir
 218         # here. installperl (or similar) should have done
 219         # it. Expecting it to exist is a valuable sanity check against
 220         # autosplitting into some random directory by mistake.
 221         print "Warning: AutoSplit had to create top-level " .
 222             "$autodir unexpectedly.\n";
 223     }
 224
 225     # allow just a package name to be used
 226     $filename .= ".pm" unless ($filename =~ m/\.pm\z/);
 227
 228     open(IN, "<$filename") or die "AutoSplit: Can't open $filename: $!\n";
 229     my($pm_mod_time) = (stat($filename))[9];
 230     my($autoloader_seen) = 0;
 231     my($in_pod) = 0;
 232     my($def_package,$last_package,$this_package,$fnr);
 233     while (<IN>) {
 234         # Skip pod text.
 235         $fnr++;
 236         $in_pod = 1 if /^=\w/;
 237         $in_pod = 0 if /^=cut/;
 238         next if ($in_pod || /^=cut/);
 239
 240         # record last package name seen
 241         $def_package = $1 if (m/^\s*package\s+([\w:]+)\s*;/);
 242         ++$autoloader_seen if m/^\s*(use|require)\s+AutoLoader\b/;
 243         ++$autoloader_seen if m/\bISA\s*=.*\bAutoLoader\b/;
 244         last if /^__END__/;
 245     }
 246     if ($check_for_autoloader && !$autoloader_seen){
 247         print "AutoSplit skipped $filename: no AutoLoader used\n"
 248             if ($Verbose>=2);
 249         return 0;
 250     }
 251     $_ or die "Can't find __END__ in $filename\n";
 252
 253     $def_package or die "Can't find 'package Name;' in $filename\n";
 254
 255     my($modpname) = _modpname($def_package);
 256     if ($Is_VMS) {
 257         $modpname = VMS::Filespec::unixify($modpname); # may have dirs
 258     }
 259
 260     # this _has_ to match so we have a reasonable timestamp file
 261     die "Package $def_package ($modpname.pm) does not ".
 262         "match filename $filename"
 263             unless ($filename =~ m/\Q$modpname.pm\E$/ or
 264                     ($^O eq 'dos') or ($^O eq 'MSWin32') or
 265                     $Is_VMS && $filename =~ m/$modpname.pm/i);
 266
 267     my($al_idx_file) = catfile($autodir, $modpname, $IndexFile);
 268
 269     if ($check_mod_time){
 270         my($al_ts_time) = (stat("$al_idx_file"))[9] || 1;
 271         if ($al_ts_time >= $pm_mod_time){
 272             print "AutoSplit skipped ($al_idx_file newer than $filename)\n"
 273                 if ($Verbose >= 2);
 274             return undef;       # one undef, not a list
 275         }
 276     }
 277
 278     my($modnamedir) = catfile($autodir, $modpname);
 279     print "AutoSplitting $filename ($modnamedir)\n"
 280         if $Verbose;
 281
 282     unless (-d $modnamedir){
 283         mkpath($modnamedir,0,0777);
 284     }
 285
 286     # We must try to deal with some SVR3 systems with a limit of 14
 287     # characters for file names. Sadly we *cannot* simply truncate all
 288     # file names to 14 characters on these systems because we *must*
 289     # create filenames which exactly match the names used by AutoLoader.pm.
 290     # This is a problem because some systems silently truncate the file
 291     # names while others treat long file names as an error.
 292
 293     my $Is83 = $maxflen==11;  # plain, case INSENSITIVE dos filenames
 294
 295     my(@subnames, $subname, %proto, %package);
 296     my @cache = ();
 297     my $caching = 1;
 298     $last_package = '';
 299     while (<IN>) {
 300         $fnr++;
 301         $in_pod = 1 if /^=\w/;
 302         $in_pod = 0 if /^=cut/;
 303         next if ($in_pod || /^=cut/);
 304         # the following (tempting) old coding gives big troubles if a
 305         # cut is forgotten at EOF:
 306         # next if /^=\w/ .. /^=cut/;
 307         if (/^package\s+([\w:]+)\s*;/) {
 308             $this_package = $def_package = $1;
 309         }
 310         if (/^sub\s+([\w:]+)(\s*(?:\(.*?\))?(?:$attr_list)?)/) {
 311             print OUT "# end of $last_package\::$subname\n1;\n"
 312                 if $last_package;
 313             $subname = $1;
 314             my $proto = $2 || '';
 315             if ($subname =~ s/(.*):://){
 316                 $this_package = $1;
 317             } else {
 318                 $this_package = $def_package;
 319             }
 320             my $fq_subname = "$this_package\::$subname";
 321             $package{$fq_subname} = $this_package;
 322             $proto{$fq_subname} = $proto;
 323             push(@subnames, $fq_subname);
 324             my($lname, $sname) = ($subname, substr($subname,0,$maxflen-3));
 325             $modpname = _modpname($this_package);
 326             my($modnamedir) = catfile($autodir, $modpname);
 327             mkpath($modnamedir,0,0777);
 328             my($lpath) = catfile($modnamedir, "$lname.al");
 329             my($spath) = catfile($modnamedir, "$sname.al");
 330             my $path;
 331             if (!$Is83 and open(OUT, ">$lpath")){
 332                 $path=$lpath;
 333                 print "  writing $lpath\n" if ($Verbose>=2);
 334             } else {
 335                 open(OUT, ">$spath") or die "Can't create $spath: $!\n";
 336                 $path=$spath;
 337                 print "  writing $spath (with truncated name)\n"
 338                         if ($Verbose>=1);
 339             }
 340             push(@outfiles, $path);
 341             print OUT <<EOT;
 342 # NOTE: Derived from $filename.
 343 # Changes made here will be lost when autosplit again.
 344 # See AutoSplit.pm.
 345 package $this_package;
 346
 347 #line $fnr "$filename (autosplit into $path)"
 348 EOT
 349             print OUT @cache;
 350             @cache = ();
 351             $caching = 0;
 352         }
 353         if($caching) {
 354             push(@cache, $_) if @cache || /\S/;
 355         } else {
 356             print OUT $_;
 357         }
 358         if(/^\}/) {
 359             if($caching) {
 360                 print OUT @cache;
 361                 @cache = ();
 362             }
 363             print OUT "\n";
 364             $caching = 1;
 365         }
 366         $last_package = $this_package if defined $this_package;
 367     }
 368     if ($subname) {
 369         print OUT @cache,"1;\n# end of $last_package\::$subname\n";
 370         close(OUT);
 371     }
 372     close(IN);
 373
 374     if (!$keep){  # don't keep any obsolete *.al files in the directory
 375         my(%outfiles);
 376         # @outfiles{@outfiles} = @outfiles;
 377         # perl downcases all filenames on VMS (which upcases all filenames) so
 378         # we'd better downcase the sub name list too, or subs with upper case
 379         # letters in them will get their .al files deleted right after they're
 380         # created. (The mixed case sub name won't match the all-lowercase
 381         # filename, and so be cleaned up as a scrap file)
 382         if ($Is_VMS or $Is83) {
 383             %outfiles = map {lc($_) => lc($_) } @outfiles;
 384         } else {
 385             @outfiles{@outfiles} = @outfiles;
 386         }
 387         my(%outdirs,@outdirs);
 388         for (@outfiles) {
 389             $outdirs{File::Basename::dirname($_)}||=1;
 390         }
 391         for my $dir (keys %outdirs) {
 392             opendir(OUTDIR,$dir);
 393             foreach (sort readdir(OUTDIR)){
 394                 next unless /\.al\z/;
 395                 my($file) = catfile($dir, $_);
 396                 $file = lc $file if $Is83 or $Is_VMS;
 397                 next if $outfiles{$file};
 398                 print "  deleting $file\n" if ($Verbose>=2);
 399                 my($deleted,$thistime);  # catch all versions on VMS
 400                 do { $deleted += ($thistime = unlink $file) } while ($thistime);
 401                 carp "Unable to delete $file: $!" unless $deleted;
 402             }
 403             closedir(OUTDIR);
 404         }
 405     }
 406
 407     open(TS,">$al_idx_file") or
 408         carp "AutoSplit: unable to create timestamp file ($al_idx_file): $!";
 409     print TS "# Index created by AutoSplit for $filename\n";
 410     print TS "#    (file acts as timestamp)\n";
 411     $last_package = '';
 412     for my $fqs (@subnames) {
 413         my($subname) = $fqs;
 414         $subname =~ s/.*:://;
 415         print TS "package $package{$fqs};\n"
 416             unless $last_package eq $package{$fqs};
 417         print TS "sub $subname $proto{$fqs};\n";
 418         $last_package = $package{$fqs};
 419     }
 420     print TS "1;\n";
 421     close(TS);
 422
 423     _check_unique($filename, $Maxlen, 1, @outfiles);
 424
 425     @outfiles;
 426 }
 427
 428 sub _modpname ($) {
 429     my($package) = @_;
 430     my $modpname = $package;
 431     if ($^O eq 'MSWin32') {
 432         $modpname =~ s#::#\\#g;
 433     } else {
 434         while ($modpname =~ m#(.*?[^:])::([^:].*)#) {
 435             $modpname = catfile($1, $2);
 436         }
 437     }
 438     $modpname;
 439 }
 440
 441 sub _check_unique {
 442     my($filename, $maxlen, $warn, @outfiles) = @_;
 443     my(%notuniq) = ();
 444     my(%shorts)  = ();
 445     my(@toolong) = grep(
 446                         length(File::Basename::basename($_))
 447                         > $maxlen,
 448                         @outfiles
 449                        );
 450
 451     foreach (@toolong){
 452         my($dir) = File::Basename::dirname($_);
 453         my($file) = File::Basename::basename($_);
 454         my($trunc) = substr($file,0,$maxlen);
 455         $notuniq{$dir}{$trunc} = 1 if $shorts{$dir}{$trunc};
 456         $shorts{$dir}{$trunc} = $shorts{$dir}{$trunc} ?
 457             "$shorts{$dir}{$trunc}, $file" : $file;
 458     }
 459     if (%notuniq && $warn){
 460         print "$filename: some names are not unique when " .
 461             "truncated to $maxlen characters:\n";
 462         foreach my $dir (sort keys %notuniq){
 463             print " directory $dir:\n";
 464             foreach my $trunc (sort keys %{$notuniq{$dir}}) {
 465                 print "  $shorts{$dir}{$trunc} truncate to $trunc\n";
 466             }
 467         }
 468     }
 469 }
 470
 471 1;
 472 __END__
 473
 474 # test functions so AutoSplit.pm can be applied to itself:
 475 sub test1 ($)   { "test 1\n"; }
 476 sub test2 ($$)  { "test 2\n"; }
 477 sub test3 ($$$) { "test 3\n"; }
 478 sub testtesttesttest4_1  { "test 4\n"; }
 479 sub testtesttesttest4_2  { "duplicate test 4\n"; }
 480 sub Just::Another::test5 { "another test 5\n"; }
 481 sub test6       { return join ":", __FILE__,__LINE__; }
 482 package Yet::Another::AutoSplit;
 483 sub testtesttesttest4_1 ($)  { "another test 4\n"; }
 484 sub testtesttesttest4_2 ($$) { "another duplicate test 4\n"; }
 485 package Yet::More::Attributes;
 486 sub test_a1 ($) : locked :locked { 1; }
 487 sub test_a2 : locked { 1; }