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