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package File::Basename;
require 5.000;
use Config;
require Exporter;
@ISA = qw(Exporter);
@EXPORT = qw(fileparse set_fileparse_fstype basename dirname);
# fileparse_set_fstype() - specify OS-based rules used in future
# calls to routines in this package
#
# Currently recognized values: VMS, MSDOS, MacOS
# Any other name uses Unix-style rules
sub fileparse_set_fstype {
$Fileparse_fstype = $_[0];
}
# fileparse() - parse file specification
#
# calling sequence:
# ($filename,$prefix,$tail) = &basename_pat($filespec,@excludelist);
# where $filespec is the file specification to be parsed, and
# @excludelist is a list of patterns which should be removed
# from the end of $filename.
# $filename is the part of $filespec after $prefix (i.e. the
# name of the file). The elements of @excludelist
# are compared to $filename, and if an
# $prefix is the path portion $filespec, up to and including
# the end of the last directory name
# $tail any characters removed from $filename because they
# matched an element of @excludelist.
#
# fileparse() first removes the directory specification from $filespec,
# according to the syntax of the OS (code is provided below to handle
# VMS, Unix, MSDOS and MacOS; you can pick the one you want using
# fileparse_set_fstype(), or you can accept the default, which is
# based on the information in the %Config array). It then compares
# each element of @excludelist to $filename, and if that element is a
# suffix of $filename, it is removed from $filename and prepended to
# $tail. By specifying the elements of @excludelist in the right order,
# you can 'nibble back' $filename to extract the portion of interest
# to you.
#
# For example, on a system running Unix,
# ($base,$path,$type) = fileparse('/virgil/aeneid/draft.book7',
# '\.book\d+');
# would yield $base == 'draft',
# $path == '/virgil/aeneid', and
# $tail == '.book7'.
# Similarly, on a system running VMS,
# ($name,$dir,$type) = fileparse('Doc_Root:[Help]Rhetoric.Rnh','\..*');
# would yield $name == 'Rhetoric';
# $dir == 'Doc_Root:[Help]', and
# $type == '.Rnh'.
#
# Version 2.2 13-Oct-1994 Charles Bailey bailey@genetics.upenn.edu
sub fileparse {
my($fullname,@suffices) = @_;
my($fstype) = $Fileparse_fstype;
my($dirpath,$tail,$suffix,$idx);
if ($fstype =~ /^VMS/i) {
if ($fullname =~ m#/#) { $fstype = '' } # We're doing Unix emulation
else {
($dirpath,$basename) = ($fullname =~ /(.*[:>\]])?(.*)/);
$dirpath = $ENV{'PATH'} unless $dirpath;
}
}
if ($fstype =~ /^MSDOS/i) {
($dirpath,$basename) = ($fullname =~ /(.*\\)?(.*)/);
$dirpath = '.' unless $dirpath;
}
elsif ($fstype =~ /^MAC/i) {
($dirpath,$basename) = ($fullname =~ /(.*:)?(.*)/);
}
else { # default to Unix
($dirpath,$basename) = ($fullname =~ m#(.*/)?(.*)#);
$dirpath = '.' unless $dirpath;
}
if (@suffices) {
foreach $suffix (@suffices) {
if ($basename =~ /($suffix)$/) {
$tail = $1 . $tail;
$basename = $`;
}
}
}
($basename,$dirpath,$tail);
}
# basename() - returns first element of list returned by fileparse()
sub basename {
(fileparse(@_))[0];
}
# dirname() - returns device and directory portion of file specification
# Behavior matches that of Unix dirname(1) exactly for Unix and MSDOS
# filespecs. This differs from the second element of the list returned
# by fileparse() in that the trailing '/' (Unix) or '\' (MSDOS) (and
# the last directory name if the filespec ends in a '/' or '\'), is lost.
sub dirname {
my($basename,$dirname) = fileparse($_[0]);
my($fstype) = $Fileparse_fstype;
if ($fstype =~ /VMS/i) {
if (m#/#) { $fstype = '' }
else { return $dirname }
}
if ($fstype =~ /MacOS/i) { return $dirname }
elsif ($fstype =~ /MSDOS/i) {
if ( $dirname =~ /:\\$/) { return $dirname }
chop $dirname;
$dirname =~ s:[^/]+$:: unless $basename;
$dirname = '.' unless $dirname;
}
else {
if ( $dirname eq '/') { return $dirname }
chop $dirname;
$dirname =~ s:[^/]+$:: unless $basename;
$dirname = '.' unless $dirname;
}
$dirname;
}
$Fileparse_fstype = $Config{'osname'};
1;
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