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