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authorReinhard Kotucha <reinhard.kotucha@web.de>2008-01-05 21:23:03 +0000
committerReinhard Kotucha <reinhard.kotucha@web.de>2008-01-05 21:23:03 +0000
commit61700e8be90ff6f495c0b1a9835fe07e9848de8d (patch)
treeba85dbc1413d5f834a501a8828e3b67678ba8524 /Master/tlpkg/tlperl/lib/Exporter/Heavy.pm
parent270728c6f3efcac6728d2c335c79824c356f428d (diff)
tlperl: Perl for scripts provided by TeX Live.
git-svn-id: svn://tug.org/texlive/trunk@6046 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/tlpkg/tlperl/lib/Exporter/Heavy.pm')
-rw-r--r--Master/tlpkg/tlperl/lib/Exporter/Heavy.pm248
1 files changed, 248 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl/lib/Exporter/Heavy.pm b/Master/tlpkg/tlperl/lib/Exporter/Heavy.pm
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+package Exporter::Heavy;
+
+use strict;
+no strict 'refs';
+
+# On one line so MakeMaker will see it.
+require Exporter; our $VERSION = $Exporter::VERSION;
+$Carp::Internal{"Exporter::Heavy"} = 1;
+
+=head1 NAME
+
+Exporter::Heavy - Exporter guts
+
+=head1 SYNOPSIS
+
+(internal use only)
+
+=head1 DESCRIPTION
+
+No user-serviceable parts inside.
+
+=cut
+
+#
+# We go to a lot of trouble not to 'require Carp' at file scope,
+# because Carp requires Exporter, and something has to give.
+#
+
+sub _rebuild_cache {
+ my ($pkg, $exports, $cache) = @_;
+ s/^&// foreach @$exports;
+ @{$cache}{@$exports} = (1) x @$exports;
+ my $ok = \@{"${pkg}::EXPORT_OK"};
+ if (@$ok) {
+ s/^&// foreach @$ok;
+ @{$cache}{@$ok} = (1) x @$ok;
+ }
+}
+
+sub heavy_export {
+
+ # First make import warnings look like they're coming from the "use".
+ local $SIG{__WARN__} = sub {
+ my $text = shift;
+ if ($text =~ s/ at \S*Exporter\S*.pm line \d+.*\n//) {
+ require Carp;
+ local $Carp::CarpLevel = 1; # ignore package calling us too.
+ Carp::carp($text);
+ }
+ else {
+ warn $text;
+ }
+ };
+ local $SIG{__DIE__} = sub {
+ require Carp;
+ local $Carp::CarpLevel = 1; # ignore package calling us too.
+ Carp::croak("$_[0]Illegal null symbol in \@${1}::EXPORT")
+ if $_[0] =~ /^Unable to create sub named "(.*?)::"/;
+ };
+
+ my($pkg, $callpkg, @imports) = @_;
+ my($type, $sym, $cache_is_current, $oops);
+ my($exports, $export_cache) = (\@{"${pkg}::EXPORT"},
+ $Exporter::Cache{$pkg} ||= {});
+
+ if (@imports) {
+ if (!%$export_cache) {
+ _rebuild_cache ($pkg, $exports, $export_cache);
+ $cache_is_current = 1;
+ }
+
+ if (grep m{^[/!:]}, @imports) {
+ my $tagsref = \%{"${pkg}::EXPORT_TAGS"};
+ my $tagdata;
+ my %imports;
+ my($remove, $spec, @names, @allexports);
+ # negated first item implies starting with default set:
+ unshift @imports, ':DEFAULT' if $imports[0] =~ m/^!/;
+ foreach $spec (@imports){
+ $remove = $spec =~ s/^!//;
+
+ if ($spec =~ s/^://){
+ if ($spec eq 'DEFAULT'){
+ @names = @$exports;
+ }
+ elsif ($tagdata = $tagsref->{$spec}) {
+ @names = @$tagdata;
+ }
+ else {
+ warn qq["$spec" is not defined in %${pkg}::EXPORT_TAGS];
+ ++$oops;
+ next;
+ }
+ }
+ elsif ($spec =~ m:^/(.*)/$:){
+ my $patn = $1;
+ @allexports = keys %$export_cache unless @allexports; # only do keys once
+ @names = grep(/$patn/, @allexports); # not anchored by default
+ }
+ else {
+ @names = ($spec); # is a normal symbol name
+ }
+
+ warn "Import ".($remove ? "del":"add").": @names "
+ if $Exporter::Verbose;
+
+ if ($remove) {
+ foreach $sym (@names) { delete $imports{$sym} }
+ }
+ else {
+ @imports{@names} = (1) x @names;
+ }
+ }
+ @imports = keys %imports;
+ }
+
+ my @carp;
+ foreach $sym (@imports) {
+ if (!$export_cache->{$sym}) {
+ if ($sym =~ m/^\d/) {
+ $pkg->VERSION($sym); # inherit from UNIVERSAL
+ # If the version number was the only thing specified
+ # then we should act as if nothing was specified:
+ if (@imports == 1) {
+ @imports = @$exports;
+ last;
+ }
+ # We need a way to emulate 'use Foo ()' but still
+ # allow an easy version check: "use Foo 1.23, ''";
+ if (@imports == 2 and !$imports[1]) {
+ @imports = ();
+ last;
+ }
+ } elsif ($sym !~ s/^&// || !$export_cache->{$sym}) {
+ # Last chance - see if they've updated EXPORT_OK since we
+ # cached it.
+
+ unless ($cache_is_current) {
+ %$export_cache = ();
+ _rebuild_cache ($pkg, $exports, $export_cache);
+ $cache_is_current = 1;
+ }
+
+ if (!$export_cache->{$sym}) {
+ # accumulate the non-exports
+ push @carp,
+ qq["$sym" is not exported by the $pkg module\n];
+ $oops++;
+ }
+ }
+ }
+ }
+ if ($oops) {
+ require Carp;
+ Carp::croak("@{carp}Can't continue after import errors");
+ }
+ }
+ else {
+ @imports = @$exports;
+ }
+
+ my($fail, $fail_cache) = (\@{"${pkg}::EXPORT_FAIL"},
+ $Exporter::FailCache{$pkg} ||= {});
+
+ if (@$fail) {
+ if (!%$fail_cache) {
+ # Build cache of symbols. Optimise the lookup by adding
+ # barewords twice... both with and without a leading &.
+ # (Technique could be applied to $export_cache at cost of memory)
+ my @expanded = map { /^\w/ ? ($_, '&'.$_) : $_ } @$fail;
+ warn "${pkg}::EXPORT_FAIL cached: @expanded" if $Exporter::Verbose;
+ @{$fail_cache}{@expanded} = (1) x @expanded;
+ }
+ my @failed;
+ foreach $sym (@imports) { push(@failed, $sym) if $fail_cache->{$sym} }
+ if (@failed) {
+ @failed = $pkg->export_fail(@failed);
+ foreach $sym (@failed) {
+ require Carp;
+ Carp::carp(qq["$sym" is not implemented by the $pkg module ],
+ "on this architecture");
+ }
+ if (@failed) {
+ require Carp;
+ Carp::croak("Can't continue after import errors");
+ }
+ }
+ }
+
+ warn "Importing into $callpkg from $pkg: ",
+ join(", ",sort @imports) if $Exporter::Verbose;
+
+ foreach $sym (@imports) {
+ # shortcut for the common case of no type character
+ (*{"${callpkg}::$sym"} = \&{"${pkg}::$sym"}, next)
+ unless $sym =~ s/^(\W)//;
+ $type = $1;
+ *{"${callpkg}::$sym"} =
+ $type eq '&' ? \&{"${pkg}::$sym"} :
+ $type eq '$' ? \${"${pkg}::$sym"} :
+ $type eq '@' ? \@{"${pkg}::$sym"} :
+ $type eq '%' ? \%{"${pkg}::$sym"} :
+ $type eq '*' ? *{"${pkg}::$sym"} :
+ do { require Carp; Carp::croak("Can't export symbol: $type$sym") };
+ }
+}
+
+sub heavy_export_to_level
+{
+ my $pkg = shift;
+ my $level = shift;
+ (undef) = shift; # XXX redundant arg
+ my $callpkg = caller($level);
+ $pkg->export($callpkg, @_);
+}
+
+# Utility functions
+
+sub _push_tags {
+ my($pkg, $var, $syms) = @_;
+ my @nontag = ();
+ my $export_tags = \%{"${pkg}::EXPORT_TAGS"};
+ push(@{"${pkg}::$var"},
+ map { $export_tags->{$_} ? @{$export_tags->{$_}}
+ : scalar(push(@nontag,$_),$_) }
+ (@$syms) ? @$syms : keys %$export_tags);
+ if (@nontag and $^W) {
+ # This may change to a die one day
+ require Carp;
+ Carp::carp(join(", ", @nontag)." are not tags of $pkg");
+ }
+}
+
+sub heavy_require_version {
+ my($self, $wanted) = @_;
+ my $pkg = ref $self || $self;
+ return ${pkg}->VERSION($wanted);
+}
+
+sub heavy_export_tags {
+ _push_tags((caller)[0], "EXPORT", \@_);
+}
+
+sub heavy_export_ok_tags {
+ _push_tags((caller)[0], "EXPORT_OK", \@_);
+}
+
+1;