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Edit File : Heavy.pm \| Size : 6.40 KB
package Exporter::Heavy; use strict; no strict 'refs'; # On one line so MakeMaker will see it. require Exporter; our $VERSION = $Exporter::VERSION; =head1 NAME Exporter::Heavy - Exporter guts =head1 SYNOPSIS (internal use only) =head1 DESCRIPTION No user-serviceable parts inside. =cut # # We go to a lot of trouble not to 'require Carp' at file scope, # because Carp requires Exporter, and something has to give. # sub _rebuild_cache { my ($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 { # Save the old __WARN__ handler in case it was defined my $oldwarn = $SIG{__WARN__}; # First make import warnings look like they're coming from the "use". local $SIG{__WARN__} = sub { # restore it back so proper stacking occurs local $SIG{__WARN__} = $oldwarn; my $text = shift; if ($text =~ s/ at \SExporter\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 = $1; no warnings 'once'; {"${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; Back

Edit File : Heavy.pm | Size : 6.40 KB

package Exporter::Heavy;

use strict;
no strict 'refs';

# On one line so MakeMaker will see it.
require Exporter;  our $VERSION = $Exporter::VERSION;

=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 {

# Save the old __WARN__ handler in case it was defined
    my $oldwarn = $SIG{__WARN__};

# First make import warnings look like they're coming from the "use".
    local $SIG{__WARN__} = sub {
	# restore it back so proper stacking occurs
	local $SIG{__WARN__} = $oldwarn;
	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 = $1;
	no warnings 'once';
	*{"${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", \@_);
}

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