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86530b38 AT |
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 | $Carp::Internal{"Exporter::Heavy"} = 1; | |
9 | our $Verbose; | |
10 | ||
11 | =head1 NAME | |
12 | ||
13 | Exporter::Heavy - Exporter guts | |
14 | ||
15 | =head1 SYNOPSIS | |
16 | ||
17 | (internal use only) | |
18 | ||
19 | =head1 DESCRIPTION | |
20 | ||
21 | No user-serviceable parts inside. | |
22 | ||
23 | =cut | |
24 | ||
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, $oops); | |
53 | my($exports, $export_cache) = (\@{"${pkg}::EXPORT"}, | |
54 | \%{"${pkg}::EXPORT"}); | |
55 | ||
56 | if (@imports) { | |
57 | if (!%$export_cache) { | |
58 | s/^&// foreach @$exports; | |
59 | @{$export_cache}{@$exports} = (1) x @$exports; | |
60 | my $ok = \@{"${pkg}::EXPORT_OK"}; | |
61 | if (@$ok) { | |
62 | s/^&// foreach @$ok; | |
63 | @{$export_cache}{@$ok} = (1) x @$ok; | |
64 | } | |
65 | } | |
66 | ||
67 | if ($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 ($spec eq 'DEFAULT'){ | |
79 | @names = @$exports; | |
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 = $1; | |
92 | @allexports = keys %$export_cache unless @allexports; # only do keys once | |
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 | my @carp; | |
113 | foreach $sym (@imports) { | |
114 | if (!$export_cache->{$sym}) { | |
115 | if ($sym =~ m/^\d/) { | |
116 | $pkg->VERSION($sym); # inherit from UNIVERSAL | |
117 | # If the version number was the only thing specified | |
118 | # then we should act as if nothing was specified: | |
119 | if (@imports == 1) { | |
120 | @imports = @$exports; | |
121 | last; | |
122 | } | |
123 | # We need a way to emulate 'use Foo ()' but still | |
124 | # allow an easy version check: "use Foo 1.23, ''"; | |
125 | if (@imports == 2 and !$imports[1]) { | |
126 | @imports = (); | |
127 | last; | |
128 | } | |
129 | } elsif ($sym !~ s/^&// || !$export_cache->{$sym}) { | |
130 | # accumulate the non-exports | |
131 | push @carp, | |
132 | qq["$sym" is not exported by the $pkg module\n]; | |
133 | $oops++; | |
134 | } | |
135 | } | |
136 | } | |
137 | if ($oops) { | |
138 | require Carp; | |
139 | Carp::croak("@{carp}Can't continue after import errors"); | |
140 | } | |
141 | } | |
142 | else { | |
143 | @imports = @$exports; | |
144 | } | |
145 | ||
146 | my($fail, $fail_cache) = (\@{"${pkg}::EXPORT_FAIL"}, | |
147 | \%{"${pkg}::EXPORT_FAIL"}); | |
148 | ||
149 | if (@$fail) { | |
150 | if (!%$fail_cache) { | |
151 | # Build cache of symbols. Optimise the lookup by adding | |
152 | # barewords twice... both with and without a leading &. | |
153 | # (Technique could be applied to $export_cache at cost of memory) | |
154 | my @expanded = map { /^\w/ ? ($_, '&'.$_) : $_ } @$fail; | |
155 | warn "${pkg}::EXPORT_FAIL cached: @expanded" if $Verbose; | |
156 | @{$fail_cache}{@expanded} = (1) x @expanded; | |
157 | } | |
158 | my @failed; | |
159 | foreach $sym (@imports) { push(@failed, $sym) if $fail_cache->{$sym} } | |
160 | if (@failed) { | |
161 | @failed = $pkg->export_fail(@failed); | |
162 | foreach $sym (@failed) { | |
163 | require Carp; | |
164 | Carp::carp(qq["$sym" is not implemented by the $pkg module ], | |
165 | "on this architecture"); | |
166 | } | |
167 | if (@failed) { | |
168 | require Carp; | |
169 | Carp::croak("Can't continue after import errors"); | |
170 | } | |
171 | } | |
172 | } | |
173 | ||
174 | warn "Importing into $callpkg from $pkg: ", | |
175 | join(", ",sort @imports) if $Verbose; | |
176 | ||
177 | foreach $sym (@imports) { | |
178 | # shortcut for the common case of no type character | |
179 | (*{"${callpkg}::$sym"} = \&{"${pkg}::$sym"}, next) | |
180 | unless $sym =~ s/^(\W)//; | |
181 | $type = $1; | |
182 | *{"${callpkg}::$sym"} = | |
183 | $type eq '&' ? \&{"${pkg}::$sym"} : | |
184 | $type eq '$' ? \${"${pkg}::$sym"} : | |
185 | $type eq '@' ? \@{"${pkg}::$sym"} : | |
186 | $type eq '%' ? \%{"${pkg}::$sym"} : | |
187 | $type eq '*' ? *{"${pkg}::$sym"} : | |
188 | do { require Carp; Carp::croak("Can't export symbol: $type$sym") }; | |
189 | } | |
190 | } | |
191 | ||
192 | sub heavy_export_to_level | |
193 | { | |
194 | my $pkg = shift; | |
195 | my $level = shift; | |
196 | (undef) = shift; # XXX redundant arg | |
197 | my $callpkg = caller($level); | |
198 | $pkg->export($callpkg, @_); | |
199 | } | |
200 | ||
201 | # Utility functions | |
202 | ||
203 | sub _push_tags { | |
204 | my($pkg, $var, $syms) = @_; | |
205 | my @nontag = (); | |
206 | my $export_tags = \%{"${pkg}::EXPORT_TAGS"}; | |
207 | push(@{"${pkg}::$var"}, | |
208 | map { $export_tags->{$_} ? @{$export_tags->{$_}} | |
209 | : scalar(push(@nontag,$_),$_) } | |
210 | (@$syms) ? @$syms : keys %$export_tags); | |
211 | if (@nontag and $^W) { | |
212 | # This may change to a die one day | |
213 | require Carp; | |
214 | Carp::carp(join(", ", @nontag)." are not tags of $pkg"); | |
215 | } | |
216 | } | |
217 | ||
218 | sub heavy_require_version { | |
219 | my($self, $wanted) = @_; | |
220 | my $pkg = ref $self || $self; | |
221 | return ${pkg}->VERSION($wanted); | |
222 | } | |
223 | ||
224 | sub heavy_export_tags { | |
225 | _push_tags((caller)[0], "EXPORT", \@_); | |
226 | } | |
227 | ||
228 | sub heavy_export_ok_tags { | |
229 | _push_tags((caller)[0], "EXPORT_OK", \@_); | |
230 | } | |
231 | ||
232 | 1; |