autosplit.pm

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package AutoSplit;

use Exporter ();
use Config qw(%Config);
use File::Basename ();
use File::Path qw(mkpath);
use File::Spec::Functions qw(curdir catfile catdir);
use strict;
our($VERSION, @ISA, @EXPORT, @EXPORT_OK, $Verbose, $Keep, $Maxlen,
    $CheckForAutoloader, $CheckModTime);

$VERSION = "1.05";
@ISA = qw(Exporter);
@EXPORT = qw(&autosplit &autosplit_lib_modules);
@EXPORT_OK = qw($Verbose $Keep $Maxlen $CheckForAutoloader $CheckModTime);

=head1 NAME

AutoSplit - split a package for autoloading

=head1 SYNOPSIS

 autosplit($file, $dir, $keep, $check, $modtime);

 autosplit_lib_modules(@modules);

=head1 DESCRIPTION

This function will split up your program into files that the AutoLoader
module can handle. It is used by both the standard perl libraries and by
the MakeMaker utility, to automatically configure libraries for autoloading.

The C<autosplit> interface splits the specified file into a hierarchy 
rooted at the directory C<$dir>. It creates directories as needed to reflect
class hierarchy, and creates the file F<autosplit.ix>. This file acts as
both forward declaration of all package routines, and as timestamp for the
last update of the hierarchy.

The remaining three arguments to C<autosplit> govern other options to
the autosplitter.

=over 2

=item $keep

If the third argument, I<$keep>, is false, then any
pre-existing C<*.al> files in the autoload directory are removed if
they are no longer part of the module (obsoleted functions).
$keep defaults to 0.

=item $check

The
fourth argument, I<$check>, instructs C<autosplit> to check the module
currently being split to ensure that it includes a C<use>
specification for the AutoLoader module, and skips the module if
AutoLoader is not detected.
$check defaults to 1.

=item $modtime

Lastly, the I<$modtime> argument specifies
that C<autosplit> is to check the modification time of the module
against that of the C<autosplit.ix> file, and only split the module if
it is newer.
$modtime defaults to 1.

=back

Typical use of AutoSplit in the perl MakeMaker utility is via the command-line
with:

 perl -e 'use AutoSplit; autosplit($ARGV[0], $ARGV[1], 0, 1, 1)'

Defined as a Make macro, it is invoked with file and directory arguments;
C<autosplit> will split the specified file into the specified directory and
delete obsolete C<.al> files, after checking first that the module does use
the AutoLoader, and ensuring that the module is not already currently split
in its current form (the modtime test).

The C<autosplit_lib_modules> form is used in the building of perl. It takes
as input a list of files (modules) that are assumed to reside in a directory
B<lib> relative to the current directory. Each file is sent to the 
autosplitter one at a time, to be split into the directory B<lib/auto>.

In both usages of the autosplitter, only subroutines defined following the
perl I<__END__> token are split out into separate files. Some
routines may be placed prior to this marker to force their immediate loading
and parsing.

=head2 Multiple packages

As of version 1.01 of the AutoSplit module it is possible to have
multiple packages within a single file. Both of the following cases
are supported:

   package NAME;
   __END__
   sub AAA { ... }
   package NAME::option1;
   sub BBB { ... }
   package NAME::option2;
   sub BBB { ... }

   package NAME;
   __END__
   sub AAA { ... }
   sub NAME::option1::BBB { ... }
   sub NAME::option2::BBB { ... }

=head1 DIAGNOSTICS

C<AutoSplit> will inform the user if it is necessary to create the
top-level directory specified in the invocation. It is preferred that
the script or installation process that invokes C<AutoSplit> have
created the full directory path ahead of time. This warning may
indicate that the module is being split into an incorrect path.

C<AutoSplit> will warn the user of all subroutines whose name causes
potential file naming conflicts on machines with drastically limited
(8 characters or less) file name length. Since the subroutine name is
used as the file name, these warnings can aid in portability to such
systems.

Warnings are issued and the file skipped if C<AutoSplit> cannot locate
either the I<__END__> marker or a "package Name;"-style specification.

C<AutoSplit> will also emit general diagnostics for inability to
create directories or files.

=cut

# for portability warn about names longer than $maxlen
$Maxlen  = 8;	# 8 for dos, 11 (14-".al") for SYSVR3
$Verbose = 1;	# 0=none, 1=minimal, 2=list .al files
$Keep    = 0;
$CheckForAutoloader = 1;
$CheckModTime = 1;

my $IndexFile = "autosplit.ix";	# file also serves as timestamp
my $maxflen = 255;
$maxflen = 14 if $Config{'d_flexfnam'} ne 'define';
if (defined (&Dos::UseLFN)) {
     $maxflen = Dos::UseLFN() ? 255 : 11;
}
my $Is_VMS = ($^O eq 'VMS');

# allow checking for valid ': attrlist' attachments.
# extra jugglery required to support both 5.8 and 5.9/5.10 features
# (support for 5.8 required for cross-compiling environments)

my $attr_list = 
  $] >= 5.009005 ?
  eval <<'__QR__'
  qr{
    \s* : \s*
    (?:
	# one attribute
	(?> # no backtrack
	    (?! \d) \w+
	    (?<nested> \( (?: [^()]++ | (?&nested)++ )*+ \) ) ?
	)
	(?: \s* : \s* | \s+ (?! :) )
    )*
  }x
__QR__
  :
  do {
    # In pre-5.9.5 world we have to do dirty tricks.
    # (we use 'our' rather than 'my' here, due to the rather complex and buggy
    # behaviour of lexicals with qr// and (??{$lex}) )
    our $trick1; # yes, cannot our and assign at the same time.
    $trick1 = qr{ \( (?: (?> [^()]+ ) | (??{ $trick1 }) )* \) }x;
    our $trick2 = qr{ (?> (?! \d) \w+ (?:$trick1)? ) (?:\s*\:\s*|\s+(?!\:)) }x;
    qr{ \s* : \s* (?: $trick2 )* }x;
  };

sub autosplit{
    my($file, $autodir,  $keep, $ckal, $ckmt) = @_;
    # $file    - the perl source file to be split (after __END__)
    # $autodir - the ".../auto" dir below which to write split subs
    # Handle optional flags:
    $keep = $Keep unless defined $keep;
    $ckal = $CheckForAutoloader unless defined $ckal;
    $ckmt = $CheckModTime unless defined $ckmt;
    autosplit_file($file, $autodir, $keep, $ckal, $ckmt);
}

sub carp{
    require Carp;
    goto &Carp::carp;
}

# This function is used during perl building/installation
# ./miniperl -e 'use AutoSplit; autosplit_lib_modules(@ARGV)' ...

sub autosplit_lib_modules {
    my(@modules) = @_; # list of Module names
    local $_; # Avoid clobber.
    while (defined($_ = shift @modules)) {
	while (m#([^:]+)::([^:].*)#) { # in case specified as ABC::XYZ
	    $_ = catfile($1, $2);
	}
	s|\\|/|g;		# bug in ksh OS/2
	s#^lib/##s; # incase specified as lib/*.pm
	my($lib) = catfile(curdir(), "lib");
	if ($Is_VMS) { # may need to convert VMS-style filespecs
	    $lib =~ s#^\[\]#.\/#;
	}
	s#^$lib\W+##s; # incase specified as ./lib/*.pm
	if ($Is_VMS && /[:>\]]/) { # may need to convert VMS-style filespecs
	    my ($dir,$name) = (/(.*])(.*)/s);
	    $dir =~ s/.*lib[\.\]]//s;
	    $dir =~ s#[\.\]]#/#g;
	    $_ = $dir . $name;
	}
	autosplit_file(catfile($lib, $_), catfile($lib, "auto"),
		       $Keep, $CheckForAutoloader, $CheckModTime);
    }
    0;
}


# private functions

my $self_mod_time = (stat __FILE__)[9];

sub autosplit_file {
    my($filename, $autodir, $keep, $check_for_autoloader, $check_mod_time)
	= @_;
    my(@outfiles);
    local($_);
    local($/) = "\n";

    # where to write output files
    $autodir ||= catfile(curdir(), "lib", "auto");
    if ($Is_VMS) {
	($autodir = VMS::Filespec::unixpath($autodir)) =~ s|/\z||;
	$filename = VMS::Filespec::unixify($filename); # may have dirs
    }
    unless (-d $autodir){
	mkpath($autodir,0,0755);
	# We should never need to create the auto dir
	# here. installperl (or similar) should have done
	# it. Expecting it to exist is a valuable sanity check against
	# autosplitting into some random directory by mistake.
	print "Warning: AutoSplit had to create top-level " .
	    "$autodir unexpectedly.\n";
    }

    # allow just a package name to be used
    $filename .= ".pm" unless ($filename =~ m/\.pm\z/);

    open(my $in, "<$filename") or die "AutoSplit: Can't open $filename: $!\n";
    my($pm_mod_time) = (stat($filename))[9];
    my($autoloader_seen) = 0;
    my($in_pod) = 0;
    my($def_package,$last_package,$this_package,$fnr);
    while (<$in>) {
	# Skip pod text.
	$fnr++;
	$in_pod = 1 if /^=\w/;