require 5.001;
-#
-# We go to a lot of trouble not to 'require Carp' at file scope,
-# because Carp requires Exporter, and something has to give.
-#
-
$ExportLevel = 0;
-$Verbose = 0 unless $Verbose;
-
-sub 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.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, $oops);
- *exports = *{"${pkg}::EXPORT"};
-
- if (@imports) {
- if (!%exports) {
- grep(s/^&//, @exports);
- @exports{@exports} = (1) x @exports;
- my $ok = \@{"${pkg}::EXPORT_OK"};
- if (@$ok) {
- grep(s/^&//, @$ok);
- @exports{@$ok} = (1) x @$ok;
- }
- }
-
- if ($imports[0] =~ m#^[/!:]#){
- 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 = $1;
- @allexports = keys %exports unless @allexports; # only do keys once
- @names = grep(/$patn/, @allexports); # not anchored by default
- }
- else {
- @names = ($spec); # is a normal symbol name
- }
-
- warn "Import ".($remove ? "del":"add").": @names "
- if $Verbose;
-
- if ($remove) {
- foreach $sym (@names) { delete $imports{$sym} }
- }
- else {
- @imports{@names} = (1) x @names;
- }
- }
- @imports = keys %imports;
- }
-
- foreach $sym (@imports) {
- if (!$exports{$sym}) {
- if ($sym =~ m/^\d/) {
- $pkg->require_version($sym);
- # 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/^&// || !$exports{$sym}) {
- require Carp;
- Carp::carp(qq["$sym" is not exported by the $pkg module]);
- $oops++;
- }
- }
- }
- if ($oops) {
- require Carp;
- Carp::croak("Can't continue after import errors");
- }
- }
- else {
- @imports = @exports;
- }
+$Verbose ||= 0;
- *fail = *{"${pkg}::EXPORT_FAIL"};
- if (@fail) {
- if (!%fail) {
- # Build cache of symbols. Optimise the lookup by adding
- # barewords twice... both with and without a leading &.
- # (Technique could be applied to %exports cache at cost of memory)
- my @expanded = map { /^\w/ ? ($_, '&'.$_) : $_ } @fail;
- warn "${pkg}::EXPORT_FAIL cached: @expanded" if $Verbose;
- @fail{@expanded} = (1) x @expanded;
- }
- my @failed;
- foreach $sym (@imports) { push(@failed, $sym) if $fail{$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 $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 export_to_level
-{
- my $pkg = shift;
- my $level = shift;
- my $callpkg = caller($level);
- $pkg->export($callpkg, @_);
+sub export_to_level {
+ require Exporter::Heavy;
+ goto &heavy_export_to_level;
}
-sub import {
- my $pkg = shift;
- my $callpkg = caller($ExportLevel);
- export $pkg, $callpkg, @_;
+sub export {
+ require Exporter::Heavy;
+ goto &heavy_export;
}
-
-
-# Utility functions
-
-sub _push_tags {
- my($pkg, $var, $syms) = @_;
- my $nontag;
- *export_tags = \%{"${pkg}::EXPORT_TAGS"};
- push(@{"${pkg}::$var"},
- map { $export_tags{$_} ? @{$export_tags{$_}} : scalar(++$nontag,$_) }
- (@$syms) ? @$syms : keys %export_tags);
- if ($nontag and $^W) {
- # This may change to a die one day
- require Carp;
- Carp::carp("Some names are not tags");
- }
+sub export_tags {
+ require Exporter::Heavy;
+ _push_tags((caller)[0], "EXPORT", \@_);
}
-sub export_tags { _push_tags((caller)[0], "EXPORT", \@_) }
-sub export_ok_tags { _push_tags((caller)[0], "EXPORT_OK", \@_) }
-
-
-# Default methods
-
-sub export_fail {
- my $self = shift;
- @_;
+sub export_ok_tags {
+ require Exporter::Heavy;
+ _push_tags((caller)[0], "EXPORT_OK", \@_);
}
-sub require_version {
- my($self, $wanted) = @_;
- my $pkg = ref $self || $self;
- my $version = ${"${pkg}::VERSION"};
- if (!$version or $version < $wanted) {
- $version ||= "(undef)";
- my $file = $INC{"$pkg.pm"};
- $file &&= " ($file)";
- require Carp;
- Carp::croak("$pkg $wanted required--this is only version $version$file")
+sub import {
+ my $pkg = shift;
+ my $callpkg = caller($ExportLevel);
+ *exports = *{"$pkg\::EXPORT"};
+ # We *need* to treat @{"$pkg\::EXPORT_FAIL"} since Carp uses it :-(
+ *fail = *{"$pkg\::EXPORT_FAIL"};
+ return export $pkg, $callpkg, @_
+ if $Verbose or $Debug or @fail > 1;
+ my $args = @_ or @_ = @exports;
+
+ if ($args and not %exports) {
+ foreach my $sym (@exports, @{"$pkg\::EXPORT_OK"}) {
+ $sym =~ s/^&//;
+ $exports{$sym} = 1;
}
- $version;
+ }
+ if ($Verbose or $Debug
+ or grep {/\W/ or $args and not exists $exports{$_}
+ or @fail and $_ eq $fail[0]
+ or (@{"$pkg\::EXPORT_OK"}
+ and $_ eq ${"$pkg\::EXPORT_OK"}[0])} @_) {
+ return export $pkg, $callpkg, ($args ? @_ : ());
+ }
+ #local $SIG{__WARN__} = sub {require Carp; goto &Carp::carp};
+ local $SIG{__WARN__} =
+ sub {require Carp; local $Carp::CarpLevel = 1; &Carp::carp};
+ foreach $sym (@_) {
+ # shortcut for the common case of no type character
+ *{"$callpkg\::$sym"} = \&{"$pkg\::$sym"};
+ }
}
1;
--- /dev/null
+package Exporter;
+
+#
+# We go to a lot of trouble not to 'require Carp' at file scope,
+# because Carp requires Exporter, and something has to give.
+#
+
+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, $oops);
+ *exports = *{"${pkg}::EXPORT"};
+
+ if (@imports) {
+ if (!%exports) {
+ grep(s/^&//, @exports);
+ @exports{@exports} = (1) x @exports;
+ my $ok = \@{"${pkg}::EXPORT_OK"};
+ if (@$ok) {
+ grep(s/^&//, @$ok);
+ @exports{@$ok} = (1) x @$ok;
+ }
+ }
+
+ if ($imports[0] =~ m#^[/!:]#){
+ 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 = $1;
+ @allexports = keys %exports unless @allexports; # only do keys once
+ @names = grep(/$patn/, @allexports); # not anchored by default
+ }
+ else {
+ @names = ($spec); # is a normal symbol name
+ }
+
+ warn "Import ".($remove ? "del":"add").": @names "
+ if $Verbose;
+
+ if ($remove) {
+ foreach $sym (@names) { delete $imports{$sym} }
+ }
+ else {
+ @imports{@names} = (1) x @names;
+ }
+ }
+ @imports = keys %imports;
+ }
+
+ foreach $sym (@imports) {
+ if (!$exports{$sym}) {
+ if ($sym =~ m/^\d/) {
+ $pkg->require_version($sym);
+ # 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/^&// || !$exports{$sym}) {
+ require Carp;
+ Carp::carp(qq["$sym" is not exported by the $pkg module]);
+ $oops++;
+ }
+ }
+ }
+ if ($oops) {
+ require Carp;
+ Carp::croak("Can't continue after import errors");
+ }
+ }
+ else {
+ @imports = @exports;
+ }
+
+ *fail = *{"${pkg}::EXPORT_FAIL"};
+ if (@fail) {
+ if (!%fail) {
+ # Build cache of symbols. Optimise the lookup by adding
+ # barewords twice... both with and without a leading &.
+ # (Technique could be applied to %exports cache at cost of memory)
+ my @expanded = map { /^\w/ ? ($_, '&'.$_) : $_ } @fail;
+ warn "${pkg}::EXPORT_FAIL cached: @expanded" if $Verbose;
+ @fail{@expanded} = (1) x @expanded;
+ }
+ my @failed;
+ foreach $sym (@imports) { push(@failed, $sym) if $fail{$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 $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;
+ my $callpkg = caller($level);
+ $pkg->export($callpkg, @_);
+}
+
+# Utility functions
+
+sub _push_tags {
+ my($pkg, $var, $syms) = @_;
+ my $nontag;
+ *export_tags = \%{"${pkg}::EXPORT_TAGS"};
+ push(@{"${pkg}::$var"},
+ map { $export_tags{$_} ? @{$export_tags{$_}} : scalar(++$nontag,$_) }
+ (@$syms) ? @$syms : keys %export_tags);
+ if ($nontag and $^W) {
+ # This may change to a die one day
+ require Carp;
+ Carp::carp("Some names are not tags");
+ }
+}
+
+# Default methods
+
+sub export_fail {
+ my $self = shift;
+ @_;
+}
+
+sub require_version {
+ my($self, $wanted) = @_;
+ my $pkg = ref $self || $self;
+ my $version = ${"${pkg}::VERSION"};
+ if (!$version or $version < $wanted) {
+ $version ||= "(undef)";
+ my $file = $INC{"$pkg.pm"};
+ $file &&= " ($file)";
+ require Carp;
+ Carp::croak("$pkg $wanted required--this is only version $version$file")
+ }
+ $version;
+}
+
+1;
projects / p5sagit/p5-mst-13.2.git / commitdiff