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Diffstat (limited to 'Master/xemtex/perl/lib/lib.pm')
| -rw-r--r-- | Master/xemtex/perl/lib/lib.pm | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/Master/xemtex/perl/lib/lib.pm b/Master/xemtex/perl/lib/lib.pm new file mode 100644 index 00000000000..83b8d737cd7 --- /dev/null +++ b/Master/xemtex/perl/lib/lib.pm @@ -0,0 +1,205 @@ +package lib; + +# THIS FILE IS AUTOMATICALLY GENERATED FROM lib_pm.PL. +# ANY CHANGES TO THIS FILE WILL BE OVERWRITTEN BY THE NEXT PERL BUILD. + +use Config; + +use strict; + +my $archname = $Config{archname}; +my $version = $Config{version}; +my @inc_version_list = reverse split / /, $Config{inc_version_list}; + + +our @ORIG_INC = @INC; # take a handy copy of 'original' value +our $VERSION = '0.5564'; +my $Is_MacOS = $^O eq 'MacOS'; +my $Mac_FS; +if ($Is_MacOS) { + require File::Spec; + $Mac_FS = eval { require Mac::FileSpec::Unixish }; +} + +sub import { + shift; + + my %names; + foreach (reverse @_) { + if ($_ eq '') { + require Carp; + Carp::carp("Empty compile time value given to use lib"); + } + + local $_ = _nativize($_); + + if (-e && ! -d _) { + require Carp; + Carp::carp("Parameter to use lib must be directory, not file"); + } + unshift(@INC, $_); + # Add any previous version directories we found at configure time + foreach my $incver (@inc_version_list) + { + my $dir = $Is_MacOS + ? File::Spec->catdir( $_, $incver ) + : "$_/$incver"; + unshift(@INC, $dir) if -d $dir; + } + # Put a corresponding archlib directory in front of $_ if it + # looks like $_ has an archlib directory below it. + my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir) + = _get_dirs($_); + unshift(@INC, $arch_dir) if -d $arch_auto_dir; + unshift(@INC, $version_dir) if -d $version_dir; + unshift(@INC, $version_arch_dir) if -d $version_arch_dir; + } + + # remove trailing duplicates + @INC = grep { ++$names{$_} == 1 } @INC; + return; +} + + +sub unimport { + shift; + + my %names; + foreach (@_) { + local $_ = _nativize($_); + + my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir) + = _get_dirs($_); + ++$names{$_}; + ++$names{$arch_dir} if -d $arch_auto_dir; + ++$names{$version_dir} if -d $version_dir; + ++$names{$version_arch_dir} if -d $version_arch_dir; + } + + # Remove ALL instances of each named directory. + @INC = grep { !exists $names{$_} } @INC; + return; +} + +sub _get_dirs { + my($dir) = @_; + my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir); + + # we could use this for all platforms in the future, but leave it + # Mac-only for now, until there is more time for testing it. + if ($Is_MacOS) { + $arch_auto_dir = File::Spec->catdir( $_, $archname, 'auto' ); + $arch_dir = File::Spec->catdir( $_, $archname, ); + $version_dir = File::Spec->catdir( $_, $version ); + $version_arch_dir = File::Spec->catdir( $_, $version, $archname ); + } else { + $arch_auto_dir = "$_/$archname/auto"; + $arch_dir = "$_/$archname"; + $version_dir = "$_/$version"; + $version_arch_dir = "$_/$version/$archname"; + } + return($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir); +} + +sub _nativize { + my($dir) = @_; + + if ($Is_MacOS && $Mac_FS && ! -d $dir) { + $dir = Mac::FileSpec::Unixish::nativize($dir); + $dir .= ":" unless $dir =~ /:$/; + } + + return $dir; +} + +1; +__END__ + +=head1 NAME + +lib - manipulate @INC at compile time + +=head1 SYNOPSIS + + use lib LIST; + + no lib LIST; + +=head1 DESCRIPTION + +This is a small simple module which simplifies the manipulation of @INC +at compile time. + +It is typically used to add extra directories to perl's search path so +that later C<use> or C<require> statements will find modules which are +not located on perl's default search path. + +=head2 Adding directories to @INC + +The parameters to C<use lib> are added to the start of the perl search +path. Saying + + use lib LIST; + +is I<almost> the same as saying + + BEGIN { unshift(@INC, LIST) } + +For each directory in LIST (called $dir here) the lib module also +checks to see if a directory called $dir/$archname/auto exists. +If so the $dir/$archname directory is assumed to be a corresponding +architecture specific directory and is added to @INC in front of $dir. + +To avoid memory leaks, all trailing duplicate entries in @INC are +removed. + +=head2 Deleting directories from @INC + +You should normally only add directories to @INC. If you need to +delete directories from @INC take care to only delete those which you +added yourself or which you are certain are not needed by other modules +in your script. Other modules may have added directories which they +need for correct operation. + +The C<no lib> statement deletes all instances of each named directory +from @INC. + +For each directory in LIST (called $dir here) the lib module also +checks to see if a directory called $dir/$archname/auto exists. +If so the $dir/$archname directory is assumed to be a corresponding +architecture specific directory and is also deleted from @INC. + +=head2 Restoring original @INC + +When the lib module is first loaded it records the current value of @INC +in an array C<@lib::ORIG_INC>. To restore @INC to that value you +can say + + @INC = @lib::ORIG_INC; + +=head1 CAVEATS + +In order to keep lib.pm small and simple, it only works with Unix +filepaths. This doesn't mean it only works on Unix, but non-Unix +users must first translate their file paths to Unix conventions. + + # VMS users wanting to put [.stuff.moo] into + # their @INC would write + use lib 'stuff/moo'; + +=head1 NOTES + +In the future, this module will likely use File::Spec for determining +paths, as it does now for Mac OS (where Unix-style or Mac-style paths +work, and Unix-style paths are converted properly to Mac-style paths +before being added to @INC). + +=head1 SEE ALSO + +FindBin - optional module which deals with paths relative to the source file. + +=head1 AUTHOR + +Tim Bunce, 2nd June 1995. + +=cut |