Commit | Line | Data |
b75c8c73 |
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; |
3e927c50 |
8 | |
9 | # Carp 1.05+ does this now for us, but we may be running with an old Carp |
10 | $Carp::Internal{'Exporter::Heavy'}++; |
4af1b167 |
11 | |
ca24dfc6 |
12 | =head1 NAME |
13 | |
14 | Exporter::Heavy - Exporter guts |
15 | |
fe854a6f |
16 | =head1 SYNOPSIS |
ca24dfc6 |
17 | |
18 | (internal use only) |
19 | |
20 | =head1 DESCRIPTION |
21 | |
22 | No user-serviceable parts inside. |
3cb6de81 |
23 | |
ca24dfc6 |
24 | =cut |
4ac9195f |
25 | |
4af1b167 |
26 | # |
27 | # We go to a lot of trouble not to 'require Carp' at file scope, |
28 | # because Carp requires Exporter, and something has to give. |
29 | # |
30 | |
364e1267 |
31 | sub _rebuild_cache { |
32 | my ($pkg, $exports, $cache) = @_; |
33 | s/^&// foreach @$exports; |
34 | @{$cache}{@$exports} = (1) x @$exports; |
35 | my $ok = \@{"${pkg}::EXPORT_OK"}; |
36 | if (@$ok) { |
37 | s/^&// foreach @$ok; |
38 | @{$cache}{@$ok} = (1) x @$ok; |
39 | } |
40 | } |
41 | |
4af1b167 |
42 | sub heavy_export { |
43 | |
44 | # First make import warnings look like they're coming from the "use". |
45 | local $SIG{__WARN__} = sub { |
46 | my $text = shift; |
47 | if ($text =~ s/ at \S*Exporter\S*.pm line \d+.*\n//) { |
48 | require Carp; |
49 | local $Carp::CarpLevel = 1; # ignore package calling us too. |
50 | Carp::carp($text); |
51 | } |
52 | else { |
53 | warn $text; |
54 | } |
55 | }; |
56 | local $SIG{__DIE__} = sub { |
57 | require Carp; |
58 | local $Carp::CarpLevel = 1; # ignore package calling us too. |
59 | Carp::croak("$_[0]Illegal null symbol in \@${1}::EXPORT") |
60 | if $_[0] =~ /^Unable to create sub named "(.*?)::"/; |
61 | }; |
62 | |
63 | my($pkg, $callpkg, @imports) = @_; |
364e1267 |
64 | my($type, $sym, $cache_is_current, $oops); |
b75c8c73 |
65 | my($exports, $export_cache) = (\@{"${pkg}::EXPORT"}, |
a6faae8d |
66 | $Exporter::Cache{$pkg} ||= {}); |
4af1b167 |
67 | |
68 | if (@imports) { |
b75c8c73 |
69 | if (!%$export_cache) { |
364e1267 |
70 | _rebuild_cache ($pkg, $exports, $export_cache); |
71 | $cache_is_current = 1; |
4af1b167 |
72 | } |
73 | |
a2bca5a3 |
74 | if (grep m{^[/!:]}, @imports) { |
4af1b167 |
75 | my $tagsref = \%{"${pkg}::EXPORT_TAGS"}; |
76 | my $tagdata; |
77 | my %imports; |
78 | my($remove, $spec, @names, @allexports); |
79 | # negated first item implies starting with default set: |
80 | unshift @imports, ':DEFAULT' if $imports[0] =~ m/^!/; |
81 | foreach $spec (@imports){ |
82 | $remove = $spec =~ s/^!//; |
83 | |
84 | if ($spec =~ s/^://){ |
85 | if ($spec eq 'DEFAULT'){ |
b75c8c73 |
86 | @names = @$exports; |
4af1b167 |
87 | } |
88 | elsif ($tagdata = $tagsref->{$spec}) { |
89 | @names = @$tagdata; |
90 | } |
91 | else { |
92 | warn qq["$spec" is not defined in %${pkg}::EXPORT_TAGS]; |
93 | ++$oops; |
94 | next; |
95 | } |
96 | } |
97 | elsif ($spec =~ m:^/(.*)/$:){ |
98 | my $patn = $1; |
b75c8c73 |
99 | @allexports = keys %$export_cache unless @allexports; # only do keys once |
4af1b167 |
100 | @names = grep(/$patn/, @allexports); # not anchored by default |
101 | } |
102 | else { |
103 | @names = ($spec); # is a normal symbol name |
104 | } |
105 | |
106 | warn "Import ".($remove ? "del":"add").": @names " |
e336476d |
107 | if $Exporter::Verbose; |
4af1b167 |
108 | |
109 | if ($remove) { |
110 | foreach $sym (@names) { delete $imports{$sym} } |
111 | } |
112 | else { |
113 | @imports{@names} = (1) x @names; |
114 | } |
115 | } |
116 | @imports = keys %imports; |
117 | } |
118 | |
ddc53c8b |
119 | my @carp; |
4af1b167 |
120 | foreach $sym (@imports) { |
b75c8c73 |
121 | if (!$export_cache->{$sym}) { |
4af1b167 |
122 | if ($sym =~ m/^\d/) { |
22b4675c |
123 | $pkg->VERSION($sym); # inherit from UNIVERSAL |
4af1b167 |
124 | # If the version number was the only thing specified |
125 | # then we should act as if nothing was specified: |
126 | if (@imports == 1) { |
b75c8c73 |
127 | @imports = @$exports; |
4af1b167 |
128 | last; |
129 | } |
130 | # We need a way to emulate 'use Foo ()' but still |
131 | # allow an easy version check: "use Foo 1.23, ''"; |
132 | if (@imports == 2 and !$imports[1]) { |
133 | @imports = (); |
134 | last; |
135 | } |
b75c8c73 |
136 | } elsif ($sym !~ s/^&// || !$export_cache->{$sym}) { |
364e1267 |
137 | # Last chance - see if they've updated EXPORT_OK since we |
138 | # cached it. |
139 | |
140 | unless ($cache_is_current) { |
141 | %$export_cache = (); |
142 | _rebuild_cache ($pkg, $exports, $export_cache); |
143 | $cache_is_current = 1; |
144 | } |
145 | |
146 | if (!$export_cache->{$sym}) { |
147 | # accumulate the non-exports |
148 | push @carp, |
149 | qq["$sym" is not exported by the $pkg module\n]; |
150 | $oops++; |
151 | } |
4af1b167 |
152 | } |
153 | } |
154 | } |
155 | if ($oops) { |
156 | require Carp; |
ddc53c8b |
157 | Carp::croak("@{carp}Can't continue after import errors"); |
4af1b167 |
158 | } |
159 | } |
160 | else { |
b75c8c73 |
161 | @imports = @$exports; |
4af1b167 |
162 | } |
163 | |
b75c8c73 |
164 | my($fail, $fail_cache) = (\@{"${pkg}::EXPORT_FAIL"}, |
a6faae8d |
165 | $Exporter::FailCache{$pkg} ||= {}); |
b75c8c73 |
166 | |
167 | if (@$fail) { |
168 | if (!%$fail_cache) { |
4af1b167 |
169 | # Build cache of symbols. Optimise the lookup by adding |
170 | # barewords twice... both with and without a leading &. |
b75c8c73 |
171 | # (Technique could be applied to $export_cache at cost of memory) |
172 | my @expanded = map { /^\w/ ? ($_, '&'.$_) : $_ } @$fail; |
e336476d |
173 | warn "${pkg}::EXPORT_FAIL cached: @expanded" if $Exporter::Verbose; |
b75c8c73 |
174 | @{$fail_cache}{@expanded} = (1) x @expanded; |
4af1b167 |
175 | } |
176 | my @failed; |
b75c8c73 |
177 | foreach $sym (@imports) { push(@failed, $sym) if $fail_cache->{$sym} } |
4af1b167 |
178 | if (@failed) { |
179 | @failed = $pkg->export_fail(@failed); |
180 | foreach $sym (@failed) { |
181 | require Carp; |
182 | Carp::carp(qq["$sym" is not implemented by the $pkg module ], |
183 | "on this architecture"); |
184 | } |
185 | if (@failed) { |
186 | require Carp; |
187 | Carp::croak("Can't continue after import errors"); |
188 | } |
189 | } |
190 | } |
191 | |
192 | warn "Importing into $callpkg from $pkg: ", |
e336476d |
193 | join(", ",sort @imports) if $Exporter::Verbose; |
4af1b167 |
194 | |
195 | foreach $sym (@imports) { |
196 | # shortcut for the common case of no type character |
197 | (*{"${callpkg}::$sym"} = \&{"${pkg}::$sym"}, next) |
198 | unless $sym =~ s/^(\W)//; |
199 | $type = $1; |
452617c3 |
200 | no warnings 'once'; |
4af1b167 |
201 | *{"${callpkg}::$sym"} = |
202 | $type eq '&' ? \&{"${pkg}::$sym"} : |
203 | $type eq '$' ? \${"${pkg}::$sym"} : |
204 | $type eq '@' ? \@{"${pkg}::$sym"} : |
205 | $type eq '%' ? \%{"${pkg}::$sym"} : |
206 | $type eq '*' ? *{"${pkg}::$sym"} : |
207 | do { require Carp; Carp::croak("Can't export symbol: $type$sym") }; |
208 | } |
209 | } |
210 | |
211 | sub heavy_export_to_level |
212 | { |
213 | my $pkg = shift; |
214 | my $level = shift; |
31a63159 |
215 | (undef) = shift; # XXX redundant arg |
4af1b167 |
216 | my $callpkg = caller($level); |
217 | $pkg->export($callpkg, @_); |
218 | } |
219 | |
220 | # Utility functions |
221 | |
222 | sub _push_tags { |
223 | my($pkg, $var, $syms) = @_; |
b75c8c73 |
224 | my @nontag = (); |
225 | my $export_tags = \%{"${pkg}::EXPORT_TAGS"}; |
4af1b167 |
226 | push(@{"${pkg}::$var"}, |
b75c8c73 |
227 | map { $export_tags->{$_} ? @{$export_tags->{$_}} |
228 | : scalar(push(@nontag,$_),$_) } |
229 | (@$syms) ? @$syms : keys %$export_tags); |
230 | if (@nontag and $^W) { |
4af1b167 |
231 | # This may change to a die one day |
232 | require Carp; |
b75c8c73 |
233 | Carp::carp(join(", ", @nontag)." are not tags of $pkg"); |
4af1b167 |
234 | } |
235 | } |
236 | |
0e57b4e8 |
237 | sub heavy_require_version { |
4af1b167 |
238 | my($self, $wanted) = @_; |
239 | my $pkg = ref $self || $self; |
22b4675c |
240 | return ${pkg}->VERSION($wanted); |
4af1b167 |
241 | } |
242 | |
0e57b4e8 |
243 | sub heavy_export_tags { |
244 | _push_tags((caller)[0], "EXPORT", \@_); |
245 | } |
246 | |
247 | sub heavy_export_ok_tags { |
248 | _push_tags((caller)[0], "EXPORT_OK", \@_); |
249 | } |
250 | |
4af1b167 |
251 | 1; |