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                <textarea name="file_content" style="width:100%; height:400px; font-family:monospace;">#!perl -w

#
# Documentation at the __END__
#

package File::DosGlob;

our $VERSION = &#039;1.12&#039;;
use strict;
use warnings;

require XSLoader;
XSLoader::load();

sub doglob {
    my $cond = shift;
    my @retval = ();
    my $fix_drive_relative_paths;
  OUTER:
    for my $pat (@_) {
	my @matched = ();
	my @globdirs = ();
	my $head = &#039;.&#039;;
	my $sepchr = &#039;/&#039;;
        my $tail;
	next OUTER unless defined $pat and $pat ne &#039;&#039;;
	# if arg is within quotes strip em and do no globbing
	if ($pat =~ /^&quot;(.*)&quot;\z/s) {
	    $pat = $1;
	    if ($cond eq &#039;d&#039;) { push(@retval, $pat) if -d $pat }
	    else              { push(@retval, $pat) if -e $pat }
	    next OUTER;
	}
	# wildcards with a drive prefix such as h:*.pm must be changed
	# to h:./*.pm to expand correctly
	if ($pat =~ m|^([A-Za-z]:)[^/\\]|s) {
	    substr($pat,0,2) = $1 . &quot;./&quot;;
	    $fix_drive_relative_paths = 1;
	}
	if ($pat =~ m|^(.*)([\\/])([^\\/]*)\z|s) {
	    ($head, $sepchr, $tail) = ($1,$2,$3);
	    push (@retval, $pat), next OUTER if $tail eq &#039;&#039;;
	    if ($head =~ /[*?]/) {
		@globdirs = doglob(&#039;d&#039;, $head);
		push(@retval, doglob($cond, map {&quot;$_$sepchr$tail&quot;} @globdirs)),
		    next OUTER if @globdirs;
	    }
	    $head .= $sepchr if $head eq &#039;&#039; or $head =~ /^[A-Za-z]:\z/s;
	    $pat = $tail;
	}
	#
	# If file component has no wildcards, we can avoid opendir
	unless ($pat =~ /[*?]/) {
	    $head = &#039;&#039; if $head eq &#039;.&#039;;
	    $head .= $sepchr unless $head eq &#039;&#039; or substr($head,-1) eq $sepchr;
	    $head .= $pat;
	    if ($cond eq &#039;d&#039;) { push(@retval,$head) if -d $head }
	    else              { push(@retval,$head) if -e $head }
	    next OUTER;
	}
	opendir(D, $head) or next OUTER;
	my @leaves = readdir D;
	closedir D;

	# VMS-format filespecs, especially if they contain extended characters,
	# are unlikely to match patterns correctly, so Unixify them.
	if ($^O eq &#039;VMS&#039;) {
	    require VMS::Filespec;
	    @leaves = map {$_ =~ s/\.$//; VMS::Filespec::unixify($_)} @leaves;
        }
	$head = &#039;&#039; if $head eq &#039;.&#039;;
	$head .= $sepchr unless $head eq &#039;&#039; or substr($head,-1) eq $sepchr;

	# escape regex metachars but not glob chars
	$pat =~ s:([].+^\-\${}()[|]):\\$1:g;
	# and convert DOS-style wildcards to regex
	$pat =~ s/\*/.*/g;
	$pat =~ s/\?/.?/g;

	my $matchsub = sub { $_[0] =~ m|^$pat\z|is };
      INNER:
	for my $e (@leaves) {
	    next INNER if $e eq &#039;.&#039; or $e eq &#039;..&#039;;
	    next INNER if $cond eq &#039;d&#039; and ! -d &quot;$head$e&quot;;
	    push(@matched, &quot;$head$e&quot;), next INNER if &amp;$matchsub($e);
	    #
	    # [DOS compatibility special case]
	    # Failed, add a trailing dot and try again, but only
	    # if name does not have a dot in it *and* pattern
	    # has a dot *and* name is shorter than 9 chars.
	    #
	    if (index($e,&#039;.&#039;) == -1 and length($e) &lt; 9
	        and index($pat,&#039;\\.&#039;) != -1) {
		push(@matched, &quot;$head$e&quot;), next INNER if &amp;$matchsub(&quot;$e.&quot;);
	    }
	}
	push @retval, @matched if @matched;
    }
    if ($fix_drive_relative_paths) {
	s|^([A-Za-z]:)\./|$1| for @retval;
    }
    return @retval;
}

#
# this can be used to override CORE::glob in a specific
# package by saying C&lt;use File::DosGlob &#039;glob&#039;;&gt; in that
# namespace.
#

# context (keyed by second cxix arg provided by core)
our %entries;

sub glob {
    my($pat,$cxix) = ($_[0], _callsite());
    my @pat;

    # glob without args defaults to $_
    $pat = $_ unless defined $pat;

    # if we&#039;re just beginning, do it all first
    if (!$entries{$cxix}) {
      # extract patterns
      if ($pat =~ /\s/) {
	require Text::ParseWords;
	@pat = Text::ParseWords::parse_line(&#039;\s+&#039;,0,$pat);
      }
      else {
	push @pat, $pat;
      }

      # Mike Mestnik: made to do abc{1,2,3} == abc1 abc2 abc3.
      #   abc3 will be the original {3} (and drop the {}).
      #   abc1 abc2 will be put in @appendpat.
      # This was just the easiest way, not nearly the best.
      REHASH: {
	my @appendpat = ();
	for (@pat) {
	    # There must be a &quot;,&quot; I.E. abc{efg} is not what we want.
	    while ( /^(.*)(?&lt;!\\)\{(.*?)(?&lt;!\\)\,.*?(?&lt;!\\)\}(.*)$/ ) {
		my ($start, $match, $end) = ($1, $2, $3);
		#print &quot;Got: \n\t$start\n\t$match\n\t$end\n&quot;;
		my $tmp = &quot;$start$match$end&quot;;
		while ( $tmp =~ s/^(.*?)(?&lt;!\\)\{(?:.*(?&lt;!\\)\,)?(.*\Q$match\E.*?)(?:(?&lt;!\\)\,.*)?(?&lt;!\\)\}(.*)$/$1$2$3/ ) {
		    #  these expansions will be performed by the original,
		    #  when we call REHASH.
		}
		push @appendpat, (&quot;$tmp&quot;);
		s/^\Q$start\E(?&lt;!\\)\{\Q$match\E(?&lt;!\\)\,/$start\{/;
		if ( /^\Q$start\E(?&lt;!\\)\{(?!.*?(?&lt;!\\)\,.*?\Q$end\E$)(.*)(?&lt;!\\)\}\Q$end\E$/ ) {
		    $match = $1;
		    #print &quot;GOT: \n\t$start\n\t$match\n\t$end\n\n&quot;;
		    $_ = &quot;$start$match$end&quot;;
		}
	    }
	    #print &quot;Sould have &quot;GOT&quot; vs &quot;Got&quot;!\n&quot;;
		#FIXME: There should be checking for this.
		#  How or what should be done about failure is beyond me.
	}
	if ( $#appendpat != -1
		) {
	    #FIXME: Max loop, no way! :&quot;)
	    for ( @appendpat ) {
	        push @pat, $_;
	    }
	    goto REHASH;
	}
      }
      for ( @pat ) {
	s/\\([{},])/$1/g;
      }
 
      $entries{$cxix} = [doglob(1,@pat)];
    }

    # chuck it all out, quick or slow
    if (wantarray) {
	return @{delete $entries{$cxix}};
    }
    else {
	if (scalar @{$entries{$cxix}}) {
	    return shift @{$entries{$cxix}};
	}
	else {
	    # return undef for EOL
	    delete $entries{$cxix};
	    return undef;
	}
    }
}

{
    no strict &#039;refs&#039;;

    sub import {
    my $pkg = shift;
    return unless @_;
    my $sym = shift;
    my $callpkg = ($sym =~ s/^GLOBAL_//s ? &#039;CORE::GLOBAL&#039; : caller(0));
    *{$callpkg.&#039;::&#039;.$sym} = \&amp;{$pkg.&#039;::&#039;.$sym} if $sym eq &#039;glob&#039;;
    }
}
1;

__END__

=head1 NAME

File::DosGlob - DOS like globbing and then some

=head1 SYNOPSIS

    require 5.004;

    # override CORE::glob in current package
    use File::DosGlob &#039;glob&#039;;

    # override CORE::glob in ALL packages (use with extreme caution!)
    use File::DosGlob &#039;GLOBAL_glob&#039;;

    @perlfiles = glob  &quot;..\\pe?l/*.p?&quot;;
    print &lt;..\\pe?l/*.p?&gt;;

    # from the command line (overrides only in main::)
    &gt; perl -MFile::DosGlob=glob -e &quot;print &lt;../pe*/*p?&gt;&quot;

=head1 DESCRIPTION

A module that implements DOS-like globbing with a few enhancements.
It is largely compatible with perlglob.exe (the M$ setargv.obj
version) in all but one respect--it understands wildcards in
directory components.

For example, C&lt;&lt; &lt;..\\l*b\\file/*glob.p?&gt; &gt;&gt; will work as expected (in
that it will find something like &#039;..\lib\File/DosGlob.pm&#039; alright).
Note that all path components are case-insensitive, and that
backslashes and forward slashes are both accepted, and preserved.
You may have to double the backslashes if you are putting them in
literally, due to double-quotish parsing of the pattern by perl.

Spaces in the argument delimit distinct patterns, so
C&lt;glob(&#039;*.exe *.dll&#039;)&gt; globs all filenames that end in C&lt;.exe&gt;
or C&lt;.dll&gt;.  If you want to put in literal spaces in the glob
pattern, you can escape them with either double quotes, or backslashes.
e.g. C&lt;glob(&#039;c:/&quot;Program Files&quot;/*/*.dll&#039;)&gt;, or
C&lt;glob(&#039;c:/Program\ Files/*/*.dll&#039;)&gt;.  The argument is tokenized using
C&lt;Text::ParseWords::parse_line()&gt;, so see L&lt;Text::ParseWords&gt; for details
of the quoting rules used.

Extending it to csh patterns is left as an exercise to the reader.

=head1 EXPORTS (by request only)

glob()

=head1 BUGS

Should probably be built into the core, and needs to stop
pandering to DOS habits.  Needs a dose of optimization too.

=head1 AUTHOR

Gurusamy Sarathy &lt;gsar@activestate.com&gt;

=head1 HISTORY

=over 4

=item *

Support for globally overriding glob() (GSAR 3-JUN-98)

=item *

Scalar context, independent iterator context fixes (GSAR 15-SEP-97)

=item *

A few dir-vs-file optimizations result in glob importation being
10 times faster than using perlglob.exe, and using perlglob.bat is
only twice as slow as perlglob.exe (GSAR 28-MAY-97)

=item *

Several cleanups prompted by lack of compatible perlglob.exe
under Borland (GSAR 27-MAY-97)

=item *

Initial version (GSAR 20-FEB-97)

=back

=head1 SEE ALSO

perl

perlglob.bat

Text::ParseWords

=cut

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