Commit | Line | Data |
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b75c8c73 MS |
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; | |
4af1b167 | 10 | |
ca24dfc6 LV |
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. | |
3cb6de81 | 22 | |
ca24dfc6 | 23 | =cut |
4ac9195f | 24 | |
4af1b167 IZ |
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, $oops); | |
b75c8c73 MS |
53 | my($exports, $export_cache) = (\@{"${pkg}::EXPORT"}, |
54 | \%{"${pkg}::EXPORT"}); | |
4af1b167 IZ |
55 | |
56 | if (@imports) { | |
b75c8c73 MS |
57 | if (!%$export_cache) { |
58 | s/^&// foreach @$exports; | |
59 | @{$export_cache}{@$exports} = (1) x @$exports; | |
4af1b167 IZ |
60 | my $ok = \@{"${pkg}::EXPORT_OK"}; |
61 | if (@$ok) { | |
b75c8c73 MS |
62 | s/^&// foreach @$ok; |
63 | @{$export_cache}{@$ok} = (1) x @$ok; | |
4af1b167 IZ |
64 | } |
65 | } | |
66 | ||
67 | if ($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 ($spec eq 'DEFAULT'){ | |
b75c8c73 | 79 | @names = @$exports; |
4af1b167 IZ |
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 = $1; | |
b75c8c73 | 92 | @allexports = keys %$export_cache unless @allexports; # only do keys once |
4af1b167 IZ |
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 $sym (@imports) { | |
b75c8c73 | 113 | if (!$export_cache->{$sym}) { |
4af1b167 IZ |
114 | if ($sym =~ m/^\d/) { |
115 | $pkg->require_version($sym); | |
116 | # If the version number was the only thing specified | |
117 | # then we should act as if nothing was specified: | |
118 | if (@imports == 1) { | |
b75c8c73 | 119 | @imports = @$exports; |
4af1b167 IZ |
120 | last; |
121 | } | |
122 | # We need a way to emulate 'use Foo ()' but still | |
123 | # allow an easy version check: "use Foo 1.23, ''"; | |
124 | if (@imports == 2 and !$imports[1]) { | |
125 | @imports = (); | |
126 | last; | |
127 | } | |
b75c8c73 | 128 | } elsif ($sym !~ s/^&// || !$export_cache->{$sym}) { |
4af1b167 IZ |
129 | require Carp; |
130 | Carp::carp(qq["$sym" is not exported by the $pkg module]); | |
131 | $oops++; | |
132 | } | |
133 | } | |
134 | } | |
135 | if ($oops) { | |
136 | require Carp; | |
137 | Carp::croak("Can't continue after import errors"); | |
138 | } | |
139 | } | |
140 | else { | |
b75c8c73 | 141 | @imports = @$exports; |
4af1b167 IZ |
142 | } |
143 | ||
b75c8c73 MS |
144 | my($fail, $fail_cache) = (\@{"${pkg}::EXPORT_FAIL"}, |
145 | \%{"${pkg}::EXPORT_FAIL"}); | |
146 | ||
147 | if (@$fail) { | |
148 | if (!%$fail_cache) { | |
4af1b167 IZ |
149 | # Build cache of symbols. Optimise the lookup by adding |
150 | # barewords twice... both with and without a leading &. | |
b75c8c73 MS |
151 | # (Technique could be applied to $export_cache at cost of memory) |
152 | my @expanded = map { /^\w/ ? ($_, '&'.$_) : $_ } @$fail; | |
4af1b167 | 153 | warn "${pkg}::EXPORT_FAIL cached: @expanded" if $Verbose; |
b75c8c73 | 154 | @{$fail_cache}{@expanded} = (1) x @expanded; |
4af1b167 IZ |
155 | } |
156 | my @failed; | |
b75c8c73 | 157 | foreach $sym (@imports) { push(@failed, $sym) if $fail_cache->{$sym} } |
4af1b167 IZ |
158 | if (@failed) { |
159 | @failed = $pkg->export_fail(@failed); | |
160 | foreach $sym (@failed) { | |
161 | require Carp; | |
162 | Carp::carp(qq["$sym" is not implemented by the $pkg module ], | |
163 | "on this architecture"); | |
164 | } | |
165 | if (@failed) { | |
166 | require Carp; | |
167 | Carp::croak("Can't continue after import errors"); | |
168 | } | |
169 | } | |
170 | } | |
171 | ||
172 | warn "Importing into $callpkg from $pkg: ", | |
173 | join(", ",sort @imports) if $Verbose; | |
174 | ||
175 | foreach $sym (@imports) { | |
176 | # shortcut for the common case of no type character | |
177 | (*{"${callpkg}::$sym"} = \&{"${pkg}::$sym"}, next) | |
178 | unless $sym =~ s/^(\W)//; | |
179 | $type = $1; | |
180 | *{"${callpkg}::$sym"} = | |
181 | $type eq '&' ? \&{"${pkg}::$sym"} : | |
182 | $type eq '$' ? \${"${pkg}::$sym"} : | |
183 | $type eq '@' ? \@{"${pkg}::$sym"} : | |
184 | $type eq '%' ? \%{"${pkg}::$sym"} : | |
185 | $type eq '*' ? *{"${pkg}::$sym"} : | |
186 | do { require Carp; Carp::croak("Can't export symbol: $type$sym") }; | |
187 | } | |
188 | } | |
189 | ||
190 | sub heavy_export_to_level | |
191 | { | |
192 | my $pkg = shift; | |
193 | my $level = shift; | |
31a63159 | 194 | (undef) = shift; # XXX redundant arg |
4af1b167 IZ |
195 | my $callpkg = caller($level); |
196 | $pkg->export($callpkg, @_); | |
197 | } | |
198 | ||
199 | # Utility functions | |
200 | ||
201 | sub _push_tags { | |
202 | my($pkg, $var, $syms) = @_; | |
b75c8c73 MS |
203 | my @nontag = (); |
204 | my $export_tags = \%{"${pkg}::EXPORT_TAGS"}; | |
4af1b167 | 205 | push(@{"${pkg}::$var"}, |
b75c8c73 MS |
206 | map { $export_tags->{$_} ? @{$export_tags->{$_}} |
207 | : scalar(push(@nontag,$_),$_) } | |
208 | (@$syms) ? @$syms : keys %$export_tags); | |
209 | if (@nontag and $^W) { | |
4af1b167 IZ |
210 | # This may change to a die one day |
211 | require Carp; | |
b75c8c73 | 212 | Carp::carp(join(", ", @nontag)." are not tags of $pkg"); |
4af1b167 IZ |
213 | } |
214 | } | |
215 | ||
4af1b167 IZ |
216 | |
217 | sub require_version { | |
218 | my($self, $wanted) = @_; | |
219 | my $pkg = ref $self || $self; | |
220 | my $version = ${"${pkg}::VERSION"}; | |
94dd7035 MS |
221 | if (!defined $version or $version < $wanted) { |
222 | $version = defined $version ? $version : "(undef)"; | |
767440f4 JL |
223 | # %INC contains slashes, but $pkg contains double-colons. |
224 | my $file = (map {s,::,/,g; $INC{$_}} "$pkg.pm")[0]; | |
94dd7035 | 225 | $file = defined $file ? " ($file)" : ''; |
4af1b167 IZ |
226 | require Carp; |
227 | Carp::croak("$pkg $wanted required--this is only version $version$file") | |
228 | } | |
229 | $version; | |
230 | } | |
231 | ||
232 | 1; |