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