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505 lines
14 KiB
505 lines
14 KiB
package File::Spec::VMS;
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use strict;
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use vars qw(@ISA $VERSION);
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require File::Spec::Unix;
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$VERSION = '1.1';
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@ISA = qw(File::Spec::Unix);
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use Cwd;
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use File::Basename;
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use VMS::Filespec;
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=head1 NAME
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File::Spec::VMS - methods for VMS file specs
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=head1 SYNOPSIS
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require File::Spec::VMS; # Done internally by File::Spec if needed
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=head1 DESCRIPTION
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See File::Spec::Unix for a documentation of the methods provided
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there. This package overrides the implementation of these methods, not
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the semantics.
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=over
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=item eliminate_macros
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Expands MM[KS]/Make macros in a text string, using the contents of
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identically named elements of C<%$self>, and returns the result
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as a file specification in Unix syntax.
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=cut
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sub eliminate_macros {
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my($self,$path) = @_;
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return '' unless $path;
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$self = {} unless ref $self;
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if ($path =~ /\s/) {
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return join ' ', map { $self->eliminate_macros($_) } split /\s+/, $path;
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}
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my($npath) = unixify($path);
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my($complex) = 0;
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my($head,$macro,$tail);
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# perform m##g in scalar context so it acts as an iterator
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while ($npath =~ m#(.*?)\$\((\S+?)\)(.*)#gs) {
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if ($self->{$2}) {
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($head,$macro,$tail) = ($1,$2,$3);
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if (ref $self->{$macro}) {
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if (ref $self->{$macro} eq 'ARRAY') {
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$macro = join ' ', @{$self->{$macro}};
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}
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else {
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print "Note: can't expand macro \$($macro) containing ",ref($self->{$macro}),
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"\n\t(using MMK-specific deferred substitutuon; MMS will break)\n";
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$macro = "\cB$macro\cB";
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$complex = 1;
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}
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}
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else { ($macro = unixify($self->{$macro})) =~ s#/\Z(?!\n)##; }
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$npath = "$head$macro$tail";
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}
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}
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if ($complex) { $npath =~ s#\cB(.*?)\cB#\${$1}#gs; }
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$npath;
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}
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=item fixpath
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Catchall routine to clean up problem MM[SK]/Make macros. Expands macros
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in any directory specification, in order to avoid juxtaposing two
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VMS-syntax directories when MM[SK] is run. Also expands expressions which
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are all macro, so that we can tell how long the expansion is, and avoid
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overrunning DCL's command buffer when MM[KS] is running.
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If optional second argument has a TRUE value, then the return string is
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a VMS-syntax directory specification, if it is FALSE, the return string
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is a VMS-syntax file specification, and if it is not specified, fixpath()
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checks to see whether it matches the name of a directory in the current
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default directory, and returns a directory or file specification accordingly.
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=cut
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sub fixpath {
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my($self,$path,$force_path) = @_;
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return '' unless $path;
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$self = bless {} unless ref $self;
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my($fixedpath,$prefix,$name);
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if ($path =~ /\s/) {
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return join ' ',
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map { $self->fixpath($_,$force_path) }
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split /\s+/, $path;
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}
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if ($path =~ m#^\$\([^\)]+\)\Z(?!\n)#s || $path =~ m#[/:>\]]#) {
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if ($force_path or $path =~ /(?:DIR\)|\])\Z(?!\n)/) {
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$fixedpath = vmspath($self->eliminate_macros($path));
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}
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else {
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$fixedpath = vmsify($self->eliminate_macros($path));
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}
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}
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elsif ((($prefix,$name) = ($path =~ m#^\$\(([^\)]+)\)(.+)#s)) && $self->{$prefix}) {
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my($vmspre) = $self->eliminate_macros("\$($prefix)");
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# is it a dir or just a name?
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$vmspre = ($vmspre =~ m|/| or $prefix =~ /DIR\Z(?!\n)/) ? vmspath($vmspre) : '';
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$fixedpath = ($vmspre ? $vmspre : $self->{$prefix}) . $name;
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$fixedpath = vmspath($fixedpath) if $force_path;
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}
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else {
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$fixedpath = $path;
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$fixedpath = vmspath($fixedpath) if $force_path;
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}
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# No hints, so we try to guess
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if (!defined($force_path) and $fixedpath !~ /[:>(.\]]/) {
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$fixedpath = vmspath($fixedpath) if -d $fixedpath;
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}
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# Trim off root dirname if it's had other dirs inserted in front of it.
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$fixedpath =~ s/\.000000([\]>])/$1/;
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# Special case for VMS absolute directory specs: these will have had device
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# prepended during trip through Unix syntax in eliminate_macros(), since
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# Unix syntax has no way to express "absolute from the top of this device's
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# directory tree".
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if ($path =~ /^[\[>][^.\-]/) { $fixedpath =~ s/^[^\[<]+//; }
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$fixedpath;
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}
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=back
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=head2 Methods always loaded
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=over
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=item canonpath (override)
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Removes redundant portions of file specifications according to VMS syntax.
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=cut
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sub canonpath {
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my($self,$path) = @_;
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if ($path =~ m|/|) { # Fake Unix
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my $pathify = $path =~ m|/\Z(?!\n)|;
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$path = $self->SUPER::canonpath($path);
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if ($pathify) { return vmspath($path); }
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else { return vmsify($path); }
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}
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else {
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$path =~ s-\]\[--g; $path =~ s/><//g; # foo.][bar ==> foo.bar
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$path =~ s/([\[<])000000\./$1/; # [000000.foo ==> foo
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1 while $path =~ s{([\[<-])\.-}{$1-}; # [.-.- ==> [--
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$path =~ s/\.[^\[<\.]+\.-([\]\>])/$1/; # bar.foo.-] ==> bar]
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$path =~ s/([\[<])(-+)/$1 . "\cx" x length($2)/e; # encode leading '-'s
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$path =~ s/([\[<\.])([^\[<\.\cx]+)\.-\.?/$1/g; # bar.-.foo ==> foo
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$path =~ s/([\[<])(\cx+)/$1 . '-' x length($2)/e; # then decode
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return $path;
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}
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}
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=item catdir
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Concatenates a list of file specifications, and returns the result as a
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VMS-syntax directory specification. No check is made for "impossible"
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cases (e.g. elements other than the first being absolute filespecs).
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=cut
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sub catdir {
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my ($self,@dirs) = @_;
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my $dir = pop @dirs;
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@dirs = grep($_,@dirs);
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my $rslt;
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if (@dirs) {
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my $path = (@dirs == 1 ? $dirs[0] : $self->catdir(@dirs));
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my ($spath,$sdir) = ($path,$dir);
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$spath =~ s/\.dir\Z(?!\n)//; $sdir =~ s/\.dir\Z(?!\n)//;
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$sdir = $self->eliminate_macros($sdir) unless $sdir =~ /^[\w\-]+\Z(?!\n)/s;
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$rslt = $self->fixpath($self->eliminate_macros($spath)."/$sdir",1);
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# Special case for VMS absolute directory specs: these will have had device
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# prepended during trip through Unix syntax in eliminate_macros(), since
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# Unix syntax has no way to express "absolute from the top of this device's
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# directory tree".
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if ($spath =~ /^[\[<][^.\-]/s) { $rslt =~ s/^[^\[<]+//s; }
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}
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else {
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if (not defined $dir or not length $dir) { $rslt = ''; }
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elsif ($dir =~ /^\$\([^\)]+\)\Z(?!\n)/s) { $rslt = $dir; }
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else { $rslt = vmspath($dir); }
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}
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return $self->canonpath($rslt);
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}
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=item catfile
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Concatenates a list of file specifications, and returns the result as a
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VMS-syntax file specification.
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=cut
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sub catfile {
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my ($self,@files) = @_;
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my $file = pop @files;
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@files = grep($_,@files);
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my $rslt;
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if (@files) {
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my $path = (@files == 1 ? $files[0] : $self->catdir(@files));
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my $spath = $path;
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$spath =~ s/\.dir\Z(?!\n)//;
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if ($spath =~ /^[^\)\]\/:>]+\)\Z(?!\n)/s && basename($file) eq $file) {
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$rslt = "$spath$file";
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}
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else {
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$rslt = $self->eliminate_macros($spath);
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$rslt = vmsify($rslt.($rslt ? '/' : '').unixify($file));
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}
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}
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else { $rslt = (defined($file) && length($file)) ? vmsify($file) : ''; }
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return $self->canonpath($rslt);
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}
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=item curdir (override)
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Returns a string representation of the current directory: '[]'
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=cut
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sub curdir {
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return '[]';
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}
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=item devnull (override)
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Returns a string representation of the null device: '_NLA0:'
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=cut
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sub devnull {
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return "_NLA0:";
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}
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=item rootdir (override)
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Returns a string representation of the root directory: 'SYS$DISK:[000000]'
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=cut
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sub rootdir {
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return 'SYS$DISK:[000000]';
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}
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=item tmpdir (override)
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Returns a string representation of the first writable directory
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from the following list or '' if none are writable:
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sys$scratch:
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$ENV{TMPDIR}
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=cut
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my $tmpdir;
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sub tmpdir {
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return $tmpdir if defined $tmpdir;
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foreach ('sys$scratch:', $ENV{TMPDIR}) {
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next unless defined && -d && -w _;
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$tmpdir = $_;
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last;
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}
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$tmpdir = '' unless defined $tmpdir;
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return $tmpdir;
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}
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=item updir (override)
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Returns a string representation of the parent directory: '[-]'
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=cut
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sub updir {
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return '[-]';
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}
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=item case_tolerant (override)
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VMS file specification syntax is case-tolerant.
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=cut
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sub case_tolerant {
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return 1;
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}
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=item path (override)
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Translate logical name DCL$PATH as a searchlist, rather than trying
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to C<split> string value of C<$ENV{'PATH'}>.
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=cut
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sub path {
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my (@dirs,$dir,$i);
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while ($dir = $ENV{'DCL$PATH;' . $i++}) { push(@dirs,$dir); }
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return @dirs;
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}
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=item file_name_is_absolute (override)
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Checks for VMS directory spec as well as Unix separators.
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=cut
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sub file_name_is_absolute {
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my ($self,$file) = @_;
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# If it's a logical name, expand it.
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$file = $ENV{$file} while $file =~ /^[\w\$\-]+\Z(?!\n)/s && $ENV{$file};
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return scalar($file =~ m!^/!s ||
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$file =~ m![<\[][^.\-\]>]! ||
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$file =~ /:[^<\[]/);
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}
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=item splitpath (override)
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Splits using VMS syntax.
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=cut
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sub splitpath {
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my($self,$path) = @_;
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my($dev,$dir,$file) = ('','','');
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vmsify($path) =~ /(.+:)?([\[<].*[\]>])?(.*)/s;
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return ($1 || '',$2 || '',$3);
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}
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=item splitdir (override)
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Split dirspec using VMS syntax.
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=cut
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sub splitdir {
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my($self,$dirspec) = @_;
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$dirspec =~ s/\]\[//g; $dirspec =~ s/\-\-/-.-/g;
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$dirspec = "[$dirspec]" unless $dirspec =~ /[\[<]/; # make legal
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my(@dirs) = split('\.', vmspath($dirspec));
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$dirs[0] =~ s/^[\[<]//s; $dirs[-1] =~ s/[\]>]\Z(?!\n)//s;
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@dirs;
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}
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=item catpath (override)
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Construct a complete filespec using VMS syntax
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=cut
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sub catpath {
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my($self,$dev,$dir,$file) = @_;
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if ($dev =~ m|^/+([^/]+)|) { $dev = "$1:"; }
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else { $dev .= ':' unless $dev eq '' or $dev =~ /:\Z(?!\n)/; }
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if (length($dev) or length($dir)) {
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$dir = "[$dir]" unless $dir =~ /[\[<\/]/;
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$dir = vmspath($dir);
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}
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"$dev$dir$file";
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}
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=item abs2rel (override)
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Use VMS syntax when converting filespecs.
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=cut
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sub abs2rel {
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my $self = shift;
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return vmspath(File::Spec::Unix::abs2rel( $self, @_ ))
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if ( join( '', @_ ) =~ m{/} ) ;
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my($path,$base) = @_;
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# Note: we use '/' to glue things together here, then let canonpath()
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# clean them up at the end.
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# Clean up $path
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if ( ! $self->file_name_is_absolute( $path ) ) {
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$path = $self->rel2abs( $path ) ;
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}
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else {
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$path = $self->canonpath( $path ) ;
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}
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# Figure out the effective $base and clean it up.
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if ( !defined( $base ) || $base eq '' ) {
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$base = cwd() ;
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}
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elsif ( ! $self->file_name_is_absolute( $base ) ) {
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$base = $self->rel2abs( $base ) ;
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}
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else {
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$base = $self->canonpath( $base ) ;
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}
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# Split up paths
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my ( $path_directories, $path_file ) =
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($self->splitpath( $path, 1 ))[1,2] ;
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$path_directories = $1
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if $path_directories =~ /^\[(.*)\]\Z(?!\n)/s ;
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my $base_directories = ($self->splitpath( $base, 1 ))[1] ;
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$base_directories = $1
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if $base_directories =~ /^\[(.*)\]\Z(?!\n)/s ;
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# Now, remove all leading components that are the same
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my @pathchunks = $self->splitdir( $path_directories );
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my @basechunks = $self->splitdir( $base_directories );
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while ( @pathchunks &&
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@basechunks &&
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lc( $pathchunks[0] ) eq lc( $basechunks[0] )
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) {
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shift @pathchunks ;
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shift @basechunks ;
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}
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# @basechunks now contains the directories to climb out of,
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# @pathchunks now has the directories to descend in to.
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$path_directories = '-.' x @basechunks . join( '.', @pathchunks ) ;
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$path_directories =~ s{\.\Z(?!\n)}{} ;
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return $self->canonpath( $self->catpath( '', $path_directories, $path_file ) ) ;
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}
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=item rel2abs (override)
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Use VMS syntax when converting filespecs.
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=cut
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sub rel2abs {
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my $self = shift ;
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return vmspath(File::Spec::Unix::rel2abs( $self, @_ ))
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if ( join( '', @_ ) =~ m{/} ) ;
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my ($path,$base ) = @_;
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# Clean up and split up $path
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if ( ! $self->file_name_is_absolute( $path ) ) {
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# Figure out the effective $base and clean it up.
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if ( !defined( $base ) || $base eq '' ) {
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$base = cwd() ;
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}
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elsif ( ! $self->file_name_is_absolute( $base ) ) {
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$base = $self->rel2abs( $base ) ;
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}
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else {
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$base = $self->canonpath( $base ) ;
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}
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# Split up paths
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my ( $path_directories, $path_file ) =
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($self->splitpath( $path ))[1,2] ;
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my ( $base_volume, $base_directories ) =
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$self->splitpath( $base ) ;
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$path_directories = '' if $path_directories eq '[]' ||
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$path_directories eq '<>';
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my $sep = '' ;
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$sep = '.'
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if ( $base_directories =~ m{[^.\]>]\Z(?!\n)} &&
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$path_directories =~ m{^[^.\[<]}s
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) ;
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$base_directories = "$base_directories$sep$path_directories";
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$base_directories =~ s{\.?[\]>][\[<]\.?}{.};
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$path = $self->catpath( $base_volume, $base_directories, $path_file );
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}
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return $self->canonpath( $path ) ;
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}
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=back
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=head1 SEE ALSO
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L<File::Spec>
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=cut
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1;
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