| 1 | package Exporter::Heavy;
|
|---|
| 2 |
|
|---|
| 3 | use strict;
|
|---|
| 4 | no strict 'refs';
|
|---|
| 5 |
|
|---|
| 6 | # On one line so MakeMaker will see it.
|
|---|
| 7 | require Exporter; our $VERSION = $Exporter::VERSION;
|
|---|
| 8 | $Carp::Internal{"Exporter::Heavy"} = 1;
|
|---|
| 9 |
|
|---|
| 10 | =head1 NAME
|
|---|
| 11 |
|
|---|
| 12 | Exporter::Heavy - Exporter guts
|
|---|
| 13 |
|
|---|
| 14 | =head1 SYNOPSIS
|
|---|
| 15 |
|
|---|
| 16 | (internal use only)
|
|---|
| 17 |
|
|---|
| 18 | =head1 DESCRIPTION
|
|---|
| 19 |
|
|---|
| 20 | No user-serviceable parts inside.
|
|---|
| 21 |
|
|---|
| 22 | =cut
|
|---|
| 23 |
|
|---|
| 24 | #
|
|---|
| 25 | # We go to a lot of trouble not to 'require Carp' at file scope,
|
|---|
| 26 | # because Carp requires Exporter, and something has to give.
|
|---|
| 27 | #
|
|---|
| 28 |
|
|---|
| 29 | sub _rebuild_cache {
|
|---|
| 30 | my ($pkg, $exports, $cache) = @_;
|
|---|
| 31 | s/^&// foreach @$exports;
|
|---|
| 32 | @{$cache}{@$exports} = (1) x @$exports;
|
|---|
| 33 | my $ok = \@{"${pkg}::EXPORT_OK"};
|
|---|
| 34 | if (@$ok) {
|
|---|
| 35 | s/^&// foreach @$ok;
|
|---|
| 36 | @{$cache}{@$ok} = (1) x @$ok;
|
|---|
| 37 | }
|
|---|
| 38 | }
|
|---|
| 39 |
|
|---|
| 40 | sub heavy_export {
|
|---|
| 41 |
|
|---|
| 42 | # First make import warnings look like they're coming from the "use".
|
|---|
| 43 | local $SIG{__WARN__} = sub {
|
|---|
| 44 | my $text = shift;
|
|---|
| 45 | if ($text =~ s/ at \S*Exporter\S*.pm line \d+.*\n//) {
|
|---|
| 46 | require Carp;
|
|---|
| 47 | local $Carp::CarpLevel = 1; # ignore package calling us too.
|
|---|
| 48 | Carp::carp($text);
|
|---|
| 49 | }
|
|---|
| 50 | else {
|
|---|
| 51 | warn $text;
|
|---|
| 52 | }
|
|---|
| 53 | };
|
|---|
| 54 | local $SIG{__DIE__} = sub {
|
|---|
| 55 | require Carp;
|
|---|
| 56 | local $Carp::CarpLevel = 1; # ignore package calling us too.
|
|---|
| 57 | Carp::croak("$_[0]Illegal null symbol in \@${1}::EXPORT")
|
|---|
| 58 | if $_[0] =~ /^Unable to create sub named "(.*?)::"/;
|
|---|
| 59 | };
|
|---|
| 60 |
|
|---|
| 61 | my($pkg, $callpkg, @imports) = @_;
|
|---|
| 62 | my($type, $sym, $cache_is_current, $oops);
|
|---|
| 63 | my($exports, $export_cache) = (\@{"${pkg}::EXPORT"},
|
|---|
| 64 | $Exporter::Cache{$pkg} ||= {});
|
|---|
| 65 |
|
|---|
| 66 | if (@imports) {
|
|---|
| 67 | if (!%$export_cache) {
|
|---|
| 68 | _rebuild_cache ($pkg, $exports, $export_cache);
|
|---|
| 69 | $cache_is_current = 1;
|
|---|
| 70 | }
|
|---|
| 71 |
|
|---|
| 72 | if (grep m{^[/!:]}, @imports) {
|
|---|
| 73 | my $tagsref = \%{"${pkg}::EXPORT_TAGS"};
|
|---|
| 74 | my $tagdata;
|
|---|
| 75 | my %imports;
|
|---|
| 76 | my($remove, $spec, @names, @allexports);
|
|---|
| 77 | # negated first item implies starting with default set:
|
|---|
| 78 | unshift @imports, ':DEFAULT' if $imports[0] =~ m/^!/;
|
|---|
| 79 | foreach $spec (@imports){
|
|---|
| 80 | $remove = $spec =~ s/^!//;
|
|---|
| 81 |
|
|---|
| 82 | if ($spec =~ s/^://){
|
|---|
| 83 | if ($spec eq 'DEFAULT'){
|
|---|
| 84 | @names = @$exports;
|
|---|
| 85 | }
|
|---|
| 86 | elsif ($tagdata = $tagsref->{$spec}) {
|
|---|
| 87 | @names = @$tagdata;
|
|---|
| 88 | }
|
|---|
| 89 | else {
|
|---|
| 90 | warn qq["$spec" is not defined in %${pkg}::EXPORT_TAGS];
|
|---|
| 91 | ++$oops;
|
|---|
| 92 | next;
|
|---|
| 93 | }
|
|---|
| 94 | }
|
|---|
| 95 | elsif ($spec =~ m:^/(.*)/$:){
|
|---|
| 96 | my $patn = $1;
|
|---|
| 97 | @allexports = keys %$export_cache unless @allexports; # only do keys once
|
|---|
| 98 | @names = grep(/$patn/, @allexports); # not anchored by default
|
|---|
| 99 | }
|
|---|
| 100 | else {
|
|---|
| 101 | @names = ($spec); # is a normal symbol name
|
|---|
| 102 | }
|
|---|
| 103 |
|
|---|
| 104 | warn "Import ".($remove ? "del":"add").": @names "
|
|---|
| 105 | if $Exporter::Verbose;
|
|---|
| 106 |
|
|---|
| 107 | if ($remove) {
|
|---|
| 108 | foreach $sym (@names) { delete $imports{$sym} }
|
|---|
| 109 | }
|
|---|
| 110 | else {
|
|---|
| 111 | @imports{@names} = (1) x @names;
|
|---|
| 112 | }
|
|---|
| 113 | }
|
|---|
| 114 | @imports = keys %imports;
|
|---|
| 115 | }
|
|---|
| 116 |
|
|---|
| 117 | my @carp;
|
|---|
| 118 | foreach $sym (@imports) {
|
|---|
| 119 | if (!$export_cache->{$sym}) {
|
|---|
| 120 | if ($sym =~ m/^\d/) {
|
|---|
| 121 | $pkg->VERSION($sym); # inherit from UNIVERSAL
|
|---|
| 122 | # If the version number was the only thing specified
|
|---|
| 123 | # then we should act as if nothing was specified:
|
|---|
| 124 | if (@imports == 1) {
|
|---|
| 125 | @imports = @$exports;
|
|---|
| 126 | last;
|
|---|
| 127 | }
|
|---|
| 128 | # We need a way to emulate 'use Foo ()' but still
|
|---|
| 129 | # allow an easy version check: "use Foo 1.23, ''";
|
|---|
| 130 | if (@imports == 2 and !$imports[1]) {
|
|---|
| 131 | @imports = ();
|
|---|
| 132 | last;
|
|---|
| 133 | }
|
|---|
| 134 | } elsif ($sym !~ s/^&// || !$export_cache->{$sym}) {
|
|---|
| 135 | # Last chance - see if they've updated EXPORT_OK since we
|
|---|
| 136 | # cached it.
|
|---|
| 137 |
|
|---|
| 138 | unless ($cache_is_current) {
|
|---|
| 139 | %$export_cache = ();
|
|---|
| 140 | _rebuild_cache ($pkg, $exports, $export_cache);
|
|---|
| 141 | $cache_is_current = 1;
|
|---|
| 142 | }
|
|---|
| 143 |
|
|---|
| 144 | if (!$export_cache->{$sym}) {
|
|---|
| 145 | # accumulate the non-exports
|
|---|
| 146 | push @carp,
|
|---|
| 147 | qq["$sym" is not exported by the $pkg module\n];
|
|---|
| 148 | $oops++;
|
|---|
| 149 | }
|
|---|
| 150 | }
|
|---|
| 151 | }
|
|---|
| 152 | }
|
|---|
| 153 | if ($oops) {
|
|---|
| 154 | require Carp;
|
|---|
| 155 | Carp::croak("@{carp}Can't continue after import errors");
|
|---|
| 156 | }
|
|---|
| 157 | }
|
|---|
| 158 | else {
|
|---|
| 159 | @imports = @$exports;
|
|---|
| 160 | }
|
|---|
| 161 |
|
|---|
| 162 | my($fail, $fail_cache) = (\@{"${pkg}::EXPORT_FAIL"},
|
|---|
| 163 | $Exporter::FailCache{$pkg} ||= {});
|
|---|
| 164 |
|
|---|
| 165 | if (@$fail) {
|
|---|
| 166 | if (!%$fail_cache) {
|
|---|
| 167 | # Build cache of symbols. Optimise the lookup by adding
|
|---|
| 168 | # barewords twice... both with and without a leading &.
|
|---|
| 169 | # (Technique could be applied to $export_cache at cost of memory)
|
|---|
| 170 | my @expanded = map { /^\w/ ? ($_, '&'.$_) : $_ } @$fail;
|
|---|
| 171 | warn "${pkg}::EXPORT_FAIL cached: @expanded" if $Exporter::Verbose;
|
|---|
| 172 | @{$fail_cache}{@expanded} = (1) x @expanded;
|
|---|
| 173 | }
|
|---|
| 174 | my @failed;
|
|---|
| 175 | foreach $sym (@imports) { push(@failed, $sym) if $fail_cache->{$sym} }
|
|---|
| 176 | if (@failed) {
|
|---|
| 177 | @failed = $pkg->export_fail(@failed);
|
|---|
| 178 | foreach $sym (@failed) {
|
|---|
| 179 | require Carp;
|
|---|
| 180 | Carp::carp(qq["$sym" is not implemented by the $pkg module ],
|
|---|
| 181 | "on this architecture");
|
|---|
| 182 | }
|
|---|
| 183 | if (@failed) {
|
|---|
| 184 | require Carp;
|
|---|
| 185 | Carp::croak("Can't continue after import errors");
|
|---|
| 186 | }
|
|---|
| 187 | }
|
|---|
| 188 | }
|
|---|
| 189 |
|
|---|
| 190 | warn "Importing into $callpkg from $pkg: ",
|
|---|
| 191 | join(", ",sort @imports) if $Exporter::Verbose;
|
|---|
| 192 |
|
|---|
| 193 | foreach $sym (@imports) {
|
|---|
| 194 | # shortcut for the common case of no type character
|
|---|
| 195 | (*{"${callpkg}::$sym"} = \&{"${pkg}::$sym"}, next)
|
|---|
| 196 | unless $sym =~ s/^(\W)//;
|
|---|
| 197 | $type = $1;
|
|---|
| 198 | *{"${callpkg}::$sym"} =
|
|---|
| 199 | $type eq '&' ? \&{"${pkg}::$sym"} :
|
|---|
| 200 | $type eq '$' ? \${"${pkg}::$sym"} :
|
|---|
| 201 | $type eq '@' ? \@{"${pkg}::$sym"} :
|
|---|
| 202 | $type eq '%' ? \%{"${pkg}::$sym"} :
|
|---|
| 203 | $type eq '*' ? *{"${pkg}::$sym"} :
|
|---|
| 204 | do { require Carp; Carp::croak("Can't export symbol: $type$sym") };
|
|---|
| 205 | }
|
|---|
| 206 | }
|
|---|
| 207 |
|
|---|
| 208 | sub heavy_export_to_level
|
|---|
| 209 | {
|
|---|
| 210 | my $pkg = shift;
|
|---|
| 211 | my $level = shift;
|
|---|
| 212 | (undef) = shift; # XXX redundant arg
|
|---|
| 213 | my $callpkg = caller($level);
|
|---|
| 214 | $pkg->export($callpkg, @_);
|
|---|
| 215 | }
|
|---|
| 216 |
|
|---|
| 217 | # Utility functions
|
|---|
| 218 |
|
|---|
| 219 | sub _push_tags {
|
|---|
| 220 | my($pkg, $var, $syms) = @_;
|
|---|
| 221 | my @nontag = ();
|
|---|
| 222 | my $export_tags = \%{"${pkg}::EXPORT_TAGS"};
|
|---|
| 223 | push(@{"${pkg}::$var"},
|
|---|
| 224 | map { $export_tags->{$_} ? @{$export_tags->{$_}}
|
|---|
| 225 | : scalar(push(@nontag,$_),$_) }
|
|---|
| 226 | (@$syms) ? @$syms : keys %$export_tags);
|
|---|
| 227 | if (@nontag and $^W) {
|
|---|
| 228 | # This may change to a die one day
|
|---|
| 229 | require Carp;
|
|---|
| 230 | Carp::carp(join(", ", @nontag)." are not tags of $pkg");
|
|---|
| 231 | }
|
|---|
| 232 | }
|
|---|
| 233 |
|
|---|
| 234 | sub heavy_require_version {
|
|---|
| 235 | my($self, $wanted) = @_;
|
|---|
| 236 | my $pkg = ref $self || $self;
|
|---|
| 237 | return ${pkg}->VERSION($wanted);
|
|---|
| 238 | }
|
|---|
| 239 |
|
|---|
| 240 | sub heavy_export_tags {
|
|---|
| 241 | _push_tags((caller)[0], "EXPORT", \@_);
|
|---|
| 242 | }
|
|---|
| 243 |
|
|---|
| 244 | sub heavy_export_ok_tags {
|
|---|
| 245 | _push_tags((caller)[0], "EXPORT_OK", \@_);
|
|---|
| 246 | }
|
|---|
| 247 |
|
|---|
| 248 | 1;
|
|---|
