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