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Viewing / Editing File: Listing.pm

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package File::Listing;

sub Version { $VERSION; }
$VERSION = "6.04";

require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(parse_dir);

use strict;

use Carp ();
use HTTP::Date qw(str2time);



sub parse_dir ($;$$$)
{
   my($dir, $tz, $fstype, $error) = @_;

   $fstype ||= 'unix';
   $fstype = "File::Listing::" . lc $fstype;

   my @args = $_[0];
   push(@args, $tz) if(@_ >= 2);
   push(@args, $error) if(@_ >= 4);

   $fstype->parse(@args);
}


sub line { Carp::croak("Not implemented yet"); }
sub init { } # Dummy sub


sub file_mode ($)
{
    Carp::croak("Input to file_mode() must be a 10 character string.")
        unless length($_[0]) == 10;

    # This routine was originally borrowed from Graham Barr's
    # Net::FTP package.

    local $_ = shift;
    my $mode = 0;
    my($type);

    s/^(.)// and $type = $1;

    # When the set-group-ID bit (file mode bit 02000) is set, and the group
    # execution bit (file mode bit 00020) is unset, and it is a regular file,
    # some implementations of `ls' use the letter `S', others use `l' or `L'.
    # Convert this `S'.

    s/[Ll](...)$/S$1/;

    while (/(.)/g) {
	$mode <<= 1;
	$mode |= 1 if $1 ne "-" &&
		      $1 ne 'S' &&
		      $1 ne 'T';
    }

    $mode |= 0004000 if /^..s....../i;
    $mode |= 0002000 if /^.....s.../i;
    $mode |= 0001000 if /^........t/i;

    # De facto standard definitions. From 'stat.h' on Solaris 9.

    $type eq "p" and $mode |= 0010000 or        # fifo
    $type eq "c" and $mode |= 0020000 or        # character special
    $type eq "d" and $mode |= 0040000 or        # directory
    $type eq "b" and $mode |= 0060000 or        # block special
    $type eq "-" and $mode |= 0100000 or        # regular
    $type eq "l" and $mode |= 0120000 or        # symbolic link
    $type eq "s" and $mode |= 0140000 or        # socket
    $type eq "D" and $mode |= 0150000 or        # door
      Carp::croak("Unknown file type: $type");

    $mode;
}


sub parse
{
   my($pkg, $dir, $tz, $error) = @_;

   # First let's try to determine what kind of dir parameter we have
   # received.  We allow both listings, reference to arrays and
   # file handles to read from.

   if (ref($dir) eq 'ARRAY') {
       # Already splitted up
   }
   elsif (ref($dir) eq 'GLOB') {
       # A file handle
   }
   elsif (ref($dir)) {
      Carp::croak("Illegal argument to parse_dir()");
   }
   elsif ($dir =~ /^\*\w+(::\w+)+$/) {
      # This scalar looks like a file handle, so we assume it is
   }
   else {
      # A normal scalar listing
      $dir = [ split(/\n/, $dir) ];
   }

   $pkg->init();

   my @files = ();
   if (ref($dir) eq 'ARRAY') {
       for (@$dir) {
	   push(@files, $pkg->line($_, $tz, $error));
       }
   }
   else {
       local($_);
       while (<$dir>) {
	   chomp;
	   push(@files, $pkg->line($_, $tz, $error));
       }
   }
   wantarray ? @files : \@files;
}



package File::Listing::unix;

use HTTP::Date qw(str2time);

# A place to remember current directory from last line parsed.
use vars qw($curdir @ISA);

@ISA = qw(File::Listing);



sub init
{
    $curdir = '';
}


sub line
{
    shift; # package name
    local($_) = shift;
    my($tz, $error) = @_;

    s/\015//g;
    #study;

    my ($kind, $size, $date, $name);
    if (($kind, $size, $date, $name) =
	/^([\-FlrwxsStTdD]{10})                   # Type and permission bits
	 .*                                       # Graps
	 \D(\d+)                                  # File size
	 \s+                                      # Some space
	 (\w{3}\s+\d+\s+(?:\d{1,2}:\d{2}|\d{4})|\d{4}-\d{2}-\d{2}\s+\d{2}:\d{2})  # Date
	 \s+                                      # Some more space
	 (.*)$                                    # File name
	/x )

    {
	return if $name eq '.' || $name eq '..';
	$name = "$curdir/$name" if length $curdir;
	my $type = '?';
	if ($kind =~ /^l/ && $name =~ /(.*) -> (.*)/ ) {
	    $name = $1;
	    $type = "l $2";
	}
	elsif ($kind =~ /^[\-F]/) { # (hopefully) a regular file
	    $type = 'f';
	}
	elsif ($kind =~ /^[dD]/) {
	    $type = 'd';
	    $size = undef;  # Don't believe the reported size
	}
	return [$name, $type, $size, str2time($date, $tz), 
              File::Listing::file_mode($kind)];

    }
    elsif (/^(.+):$/ && !/^[dcbsp].*\s.*\s.*:$/ ) {
	my $dir = $1;
	return () if $dir eq '.';
	$curdir = $dir;
	return ();
    }
    elsif (/^[Tt]otal\s+(\d+)$/ || /^\s*$/) {
	return ();
    }
    elsif (/not found/    || # OSF1, HPUX, and SunOS return
             # "$file not found"
             /No such file/ || # IRIX returns
             # "UX:ls: ERROR: Cannot access $file: No such file or directory"
                               # Solaris returns
             # "$file: No such file or directory"
             /cannot find/     # Windows NT returns
             # "The system cannot find the path specified."
             ) {
	return () unless defined $error;
	&$error($_) if ref($error) eq 'CODE';
	warn "Error: $_\n" if $error eq 'warn';
	return ();
    }
    elsif ($_ eq '') {       # AIX, and Linux return nothing
	return () unless defined $error;
	&$error("No such file or directory") if ref($error) eq 'CODE';
	warn "Warning: No such file or directory\n" if $error eq 'warn';
	return ();
    }
    else {
        # parse failed, check if the dosftp parse understands it
        File::Listing::dosftp->init();
        return(File::Listing::dosftp->line($_,$tz,$error));
    }

}



package File::Listing::dosftp;

use HTTP::Date qw(str2time);

# A place to remember current directory from last line parsed.
use vars qw($curdir @ISA);

@ISA = qw(File::Listing);



sub init
{
    $curdir = '';
}


sub line
{
    shift; # package name
    local($_) = shift;
    my($tz, $error) = @_;

    s/\015//g;

    my ($date, $size_or_dir, $name, $size);

    # 02-05-96  10:48AM                 1415 src.slf
    # 09-10-96  09:18AM       <DIR>          sl_util
    if (($date, $size_or_dir, $name) =
        /^(\d\d-\d\d-\d\d\s+\d\d:\d\d\wM)         # Date and time info
         \s+                                      # Some space
         (<\w{3}>|\d+)                            # Dir or Size
         \s+                                      # Some more space
         (.+)$                                    # File name
        /x )
    {
	return if $name eq '.' || $name eq '..';
	$name = "$curdir/$name" if length $curdir;
	my $type = '?';
	if ($size_or_dir eq '<DIR>') {
	    $type = "d";
            $size = ""; # directories have no size in the pc listing
        }
        else {
	    $type = 'f';
            $size = $size_or_dir;
	}
	return [$name, $type, $size, str2time($date, $tz), undef];
    }
    else {
	return () unless defined $error;
	&$error($_) if ref($error) eq 'CODE';
	warn "Can't parse: $_\n" if $error eq 'warn';
	return ();
    }

}



package File::Listing::vms;
@File::Listing::vms::ISA = qw(File::Listing);

package File::Listing::netware;
@File::Listing::netware::ISA = qw(File::Listing);



package File::Listing::apache;

use vars qw(@ISA);

@ISA = qw(File::Listing);


sub init { }


sub line {
    shift; # package name
    local($_) = shift;
    my($tz, $error) = @_; # ignored for now...

    s!</?t[rd][^>]*>! !g;  # clean away various table stuff
    if (m!<A\s+HREF=\"([^\"]+)\">.*</A>.*?(\d+)-([a-zA-Z]+|\d+)-(\d+)\s+(\d+):(\d+)\s+(?:([\d\.]+[kMG]?|-))!i) {
	my($filename, $filesize) = ($1, $7);
	my($d,$m,$y, $H,$M) = ($2,$3,$4,$5,$6);
	if ($m =~ /^\d+$/) {
	    ($d,$y) = ($y,$d) # iso date
	}
	else {
	    $m = _monthabbrev_number($m);
	}

	$filesize = 0 if $filesize eq '-';
	if ($filesize =~ s/k$//i) {
	    $filesize *= 1024;
	}
	elsif ($filesize =~ s/M$//) {
	    $filesize *= 1024*1024;
	}
	elsif ($filesize =~ s/G$//) {
	    $filesize *= 1024*1024*1024;
	}
	$filesize = int $filesize;

	require Time::Local;
	my $filetime = Time::Local::timelocal(0,$M,$H,$d,$m-1,_guess_year($y)-1900);
	my $filetype = ($filename =~ s|/$|| ? "d" : "f");
	return [$filename, $filetype, $filesize, $filetime, undef];
    }

    return ();
}


sub _guess_year {
    my $y = shift;
    if ($y >= 90) {
	$y = 1900+$y;
    }
    elsif ($y < 100) {
	$y = 2000+$y;
    }
    $y;
}


sub _monthabbrev_number {
    my $mon = shift;
    +{'Jan' => 1,
      'Feb' => 2,
      'Mar' => 3,
      'Apr' => 4,
      'May' => 5,
      'Jun' => 6,
      'Jul' => 7,
      'Aug' => 8,
      'Sep' => 9,
      'Oct' => 10,
      'Nov' => 11,
      'Dec' => 12,
     }->{$mon};
}


1;

__END__

=head1 NAME

File::Listing - parse directory listing

=head1 SYNOPSIS

 use File::Listing qw(parse_dir);
 $ENV{LANG} = "C";  # dates in non-English locales not supported
 for (parse_dir(`ls -l`)) {
     ($name, $type, $size, $mtime, $mode) = @$_;
     next if $type ne 'f'; # plain file
     #...
 }

 # directory listing can also be read from a file
 open(LISTING, "zcat ls-lR.gz|");
 $dir = parse_dir(\*LISTING, '+0000');

=head1 DESCRIPTION

This module exports a single function called parse_dir(), which can be
used to parse directory listings.

The first parameter to parse_dir() is the directory listing to parse.
It can be a scalar, a reference to an array of directory lines or a
glob representing a filehandle to read the directory listing from.

The second parameter is the time zone to use when parsing time stamps
in the listing. If this value is undefined, then the local time zone is
assumed.

The third parameter is the type of listing to assume.  Currently
supported formats are 'unix', 'apache' and 'dosftp'.  The default
value is 'unix'.  Ideally, the listing type should be determined
automatically.

The fourth parameter specifies how unparseable lines should be treated.
Values can be 'ignore', 'warn' or a code reference.  Warn means that
the perl warn() function will be called.  If a code reference is
passed, then this routine will be called and the return value from it
will be incorporated in the listing.  The default is 'ignore'.

Only the first parameter is mandatory.

The return value from parse_dir() is a list of directory entries.  In
a scalar context the return value is a reference to the list.  The
directory entries are represented by an array consisting of [
$filename, $filetype, $filesize, $filetime, $filemode ].  The
$filetype value is one of the letters 'f', 'd', 'l' or '?'.  The
$filetime value is the seconds since Jan 1, 1970.  The
$filemode is a bitmask like the mode returned by stat().

=head1 COPYRIGHT

Copyright 1996-2010, Gisle Aas

Based on lsparse.pl (from Lee McLoughlin's ftp mirror package) and
Net::FTP's parse_dir (Graham Barr).

This library is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
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