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