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File Content: `Basename.pm`

=head1 NAME

File::Basename - Parse file paths into directory, filename and suffix.

=head1 SYNOPSIS

    use File::Basename;

    ($name,$path,$suffix) = fileparse($fullname,@suffixlist);
    $name = fileparse($fullname,@suffixlist);

    $basename = basename($fullname,@suffixlist);
    $dirname  = dirname($fullname);


=head1 DESCRIPTION

These routines allow you to parse file paths into their directory, filename
and suffix.

B<NOTE>: C<dirname()> and C<basename()> emulate the behaviours, and
quirks, of the shell and C functions of the same name.  See each
function's documentation for details.  If your concern is just parsing
paths it is safer to use L<File::Spec>'s C<splitpath()> and
C<splitdir()> methods.

It is guaranteed that

    # Where $path_separator is / for Unix, \ for Windows, etc...
    dirname($path) . $path_separator . basename($path);

is equivalent to the original path for all systems but VMS.


=cut


package File::Basename;

# File::Basename is used during the Perl build, when the re extension may
# not be available, but we only actually need it if running under tainting.
BEGIN {
  if (${^TAINT}) {
    require re;
    re->import('taint');
  }
}


use strict;
use 5.006;
use warnings;
our(@ISA, @EXPORT, $VERSION, $Fileparse_fstype, $Fileparse_igncase);
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(fileparse fileparse_set_fstype basename dirname);
$VERSION = "2.85";

fileparse_set_fstype($^O);


=over 4

=item C<fileparse>
X<fileparse>

    my($filename, $dirs, $suffix) = fileparse($path);
    my($filename, $dirs, $suffix) = fileparse($path, @suffixes);
    my $filename                  = fileparse($path, @suffixes);

The C<fileparse()> routine divides a file path into its $dirs, $filename
and (optionally) the filename $suffix.

$dirs contains everything up to and including the last
directory separator in the $path including the volume (if applicable).
The remainder of the $path is the $filename.

     # On Unix returns ("baz", "/foo/bar/", "")
     fileparse("/foo/bar/baz");

     # On Windows returns ("baz", 'C:\foo\bar\', "")
     fileparse('C:\foo\bar\baz');

     # On Unix returns ("", "/foo/bar/baz/", "")
     fileparse("/foo/bar/baz/");

If @suffixes are given each element is a pattern (either a string or a
C<qr//>) matched against the end of the $filename.  The matching
portion is removed and becomes the $suffix.

     # On Unix returns ("baz", "/foo/bar/", ".txt")
     fileparse("/foo/bar/baz.txt", qr/\.[^.]*/);

If type is non-Unix (see L</fileparse_set_fstype>) then the pattern
matching for suffix removal is performed case-insensitively, since
those systems are not case-sensitive when opening existing files.

You are guaranteed that C<$dirs . $filename . $suffix> will
denote the same location as the original $path.

=cut


sub fileparse {
  my($fullname,@suffices) = @_;

  unless (defined $fullname) {
      require Carp;
      Carp::croak("fileparse(): need a valid pathname");
  }

  my $orig_type = '';
  my($type,$igncase) = ($Fileparse_fstype, $Fileparse_igncase);

  my($taint) = substr($fullname,0,0);  # Is $fullname tainted?

  if ($type eq "VMS" and $fullname =~ m{/} ) {
    # We're doing Unix emulation
    $orig_type = $type;
    $type = 'Unix';
  }

  my($dirpath, $basename);

  if (grep { $type eq $_ } qw(MSDOS DOS MSWin32 Epoc)) {
    ($dirpath,$basename) = ($fullname =~ /^((?:.*[:\\\/])?)(.*)/s);
    $dirpath .= '.\\' unless $dirpath =~ /[\\\/]\z/;
  }
  elsif ($type eq "OS2") {
    ($dirpath,$basename) = ($fullname =~ m#^((?:.*[:\\/])?)(.*)#s);
    $dirpath = './' unless $dirpath;	# Can't be 0
    $dirpath .= '/' unless $dirpath =~ m#[\\/]\z#;
  }
  elsif ($type eq "MacOS") {
    ($dirpath,$basename) = ($fullname =~ /^(.*:)?(.*)/s);
    $dirpath = ':' unless $dirpath;
  }
  elsif ($type eq "AmigaOS") {
    ($dirpath,$basename) = ($fullname =~ /(.*[:\/])?(.*)/s);
    $dirpath = './' unless $dirpath;
  }
  elsif ($type eq 'VMS' ) {
    ($dirpath,$basename) = ($fullname =~ /^(.*[:>\]])?(.*)/s);
    $dirpath ||= '';  # should always be defined
  }
  else { # Default to Unix semantics.
    ($dirpath,$basename) = ($fullname =~ m{^(.*/)?(.*)}s);
    if ($orig_type eq 'VMS' and $fullname =~ m{^(/[^/]+/000000(/|$))(.*)}) {
      # dev:[000000] is top of VMS tree, similar to Unix '/'
      # so strip it off and treat the rest as "normal"
      my $devspec  = $1;
      my $remainder = $3;
      ($dirpath,$basename) = ($remainder =~ m{^(.*/)?(.*)}s);
      $dirpath ||= '';  # should always be defined
      $dirpath = $devspec.$dirpath;
    }
    $dirpath = './' unless $dirpath;
  }
      

  my $tail   = '';
  my $suffix = '';
  if (@suffices) {
    foreach $suffix (@suffices) {
      my $pat = ($igncase ? '(?i)' : '') . "($suffix)\$";
      if ($basename =~ s/$pat//s) {
        $taint .= substr($suffix,0,0);
        $tail = $1 . $tail;
      }
    }
  }

  # Ensure taint is propagated from the path to its pieces.
  $tail .= $taint;
  wantarray ? ($basename .= $taint, $dirpath .= $taint, $tail)
            : ($basename .= $taint);
}



=item C<basename>
X<basename> X<filename>

    my $filename = basename($path);
    my $filename = basename($path, @suffixes);

This function is provided for compatibility with the Unix shell command
C<basename(1)>.  It does B<NOT> always return the file name portion of a
path as you might expect.  To be safe, if you want the file name portion of
a path use C<fileparse()>.

C<basename()> returns the last level of a filepath even if the last
level is clearly directory.  In effect, it is acting like C<pop()> for
paths.  This differs from C<fileparse()>'s behaviour.

    # Both return "bar"
    basename("/foo/bar");
    basename("/foo/bar/");

@suffixes work as in C<fileparse()> except all regex metacharacters are
quoted.

    # These two function calls are equivalent.
    my $filename = basename("/foo/bar/baz.txt",  ".txt");
    my $filename = fileparse("/foo/bar/baz.txt", qr/\Q.txt\E/);

Also note that in order to be compatible with the shell command,
C<basename()> does not strip off a suffix if it is identical to the
remaining characters in the filename.

=cut


sub basename {
  my($path) = shift;

  # From BSD basename(1)
  # The basename utility deletes any prefix ending with the last slash '/'
  # character present in string (after first stripping trailing slashes)
  _strip_trailing_sep($path);

  my($basename, $dirname, $suffix) = fileparse( $path, map("\Q$_\E",@_) );

  # From BSD basename(1)
  # The suffix is not stripped if it is identical to the remaining 
  # characters in string.
  if( length $suffix and !length $basename ) {
      $basename = $suffix;
  }
  
  # Ensure that basename '/' == '/'
  if( !length $basename ) {
      $basename = $dirname;
  }

  return $basename;
}



=item C<dirname>
X<dirname>

This function is provided for compatibility with the Unix shell
command C<dirname(1)> and has inherited some of its quirks.  In spite of
its name it does B<NOT> always return the directory name as you might
expect.  To be safe, if you want the directory name of a path use
C<fileparse()>.

Only on VMS (where there is no ambiguity between the file and directory
portions of a path) and AmigaOS (possibly due to an implementation quirk in
this module) does C<dirname()> work like C<fileparse($path)>, returning just the
$dirs.

    # On VMS and AmigaOS
    my $dirs = dirname($path);

When using Unix or MSDOS syntax this emulates the C<dirname(1)> shell function
which is subtly different from how C<fileparse()> works.  It returns all but
the last level of a file path even if the last level is clearly a directory.
In effect, it is not returning the directory portion but simply the path one
level up acting like C<chop()> for file paths.

Also unlike C<fileparse()>, C<dirname()> does not include a trailing slash on
its returned path.

    # returns /foo/bar.  fileparse() would return /foo/bar/
    dirname("/foo/bar/baz");

    # also returns /foo/bar despite the fact that baz is clearly a 
    # directory.  fileparse() would return /foo/bar/baz/
    dirname("/foo/bar/baz/");

    # returns '.'.  fileparse() would return 'foo/'
    dirname("foo/");

Under VMS, if there is no directory information in the $path, then the
current default device and directory is used.

=cut


sub dirname {
    my $path = shift;

    my($type) = $Fileparse_fstype;

    if( $type eq 'VMS' and $path =~ m{/} ) {
        # Parse as Unix
        local($File::Basename::Fileparse_fstype) = '';
        return dirname($path);
    }

    my($basename, $dirname) = fileparse($path);

    if ($type eq 'VMS') { 
        $dirname ||= $ENV{DEFAULT};
    }
    elsif ($type eq 'MacOS') {
	if( !length($basename) && $dirname !~ /^[^:]+:\z/) {
            _strip_trailing_sep($dirname);
	    ($basename,$dirname) = fileparse $dirname;
	}
	$dirname .= ":" unless $dirname =~ /:\z/;
    }
    elsif (grep { $type eq $_ } qw(MSDOS DOS MSWin32 OS2)) { 
        _strip_trailing_sep($dirname);
        unless( length($basename) ) {
	    ($basename,$dirname) = fileparse $dirname;
	    _strip_trailing_sep($dirname);
	}
    }
    elsif ($type eq 'AmigaOS') {
        if ( $dirname =~ /:\z/) { return $dirname }
        chop $dirname;
        $dirname =~ s{[^:/]+\z}{} unless length($basename);
    }
    else {
        _strip_trailing_sep($dirname);
        unless( length($basename) ) {
	    ($basename,$dirname) = fileparse $dirname;
	    _strip_trailing_sep($dirname);
	}
    }

    $dirname;
}


# Strip the trailing path separator.
sub _strip_trailing_sep  {
    my $type = $Fileparse_fstype;

    if ($type eq 'MacOS') {
        $_[0] =~ s/([^:]):\z/$1/s;
    }
    elsif (grep { $type eq $_ } qw(MSDOS DOS MSWin32 OS2)) { 
        $_[0] =~ s/([^:])[\\\/]*\z/$1/;
    }
    else {
        $_[0] =~ s{(.)/*\z}{$1}s;
    }
}


=item C<fileparse_set_fstype>
X<filesystem>

  my $type = fileparse_set_fstype();
  my $previous_type = fileparse_set_fstype($type);

Normally File::Basename will assume a file path type native to your current
operating system (ie. /foo/bar style on Unix, \foo\bar on Windows, etc...).
With this function you can override that assumption.

Valid $types are "MacOS", "VMS", "AmigaOS", "OS2", "RISCOS",
"MSWin32", "DOS" (also "MSDOS" for backwards bug compatibility),
"Epoc" and "Unix" (all case-insensitive).  If an unrecognized $type is
given "Unix" will be assumed.

If you've selected VMS syntax, and the file specification you pass to
one of these routines contains a "/", they assume you are using Unix
emulation and apply the Unix syntax rules instead, for that function
call only.

=back

=cut


BEGIN {

my @Ignore_Case = qw(MacOS VMS AmigaOS OS2 RISCOS MSWin32 MSDOS DOS Epoc);
my @Types = (@Ignore_Case, qw(Unix));

sub fileparse_set_fstype {
    my $old = $Fileparse_fstype;

    if (@_) {
        my $new_type = shift;

        $Fileparse_fstype = 'Unix';  # default
        foreach my $type (@Types) {
            $Fileparse_fstype = $type if $new_type =~ /^$type/i;
        }

        $Fileparse_igncase = 
          (grep $Fileparse_fstype eq $_, @Ignore_Case) ? 1 : 0;
    }

    return $old;
}

}


1;


=head1 SEE ALSO

L<dirname(1)>, L<basename(1)>, L<File::Spec>
Name	Size	Permission
Basename.pm	11194 bytes	0644
Compare.pm	4332 bytes	0644
Copy.pm	16254 bytes	0644
Fetch.pm	46866 bytes	0644
Find.pm	33091 bytes	0644
GlobMapper.pm	15678 bytes	0644
Path.pm	43253 bytes	0644
Temp.pm	117766 bytes	0644
stat.pm	10221 bytes	0644
File Content: Basename.pm

File Content: `Basename.pm`
