Commit | Line | Data |
94caac6e |
1 | package Devel::Declare; |
2 | |
3 | use strict; |
4 | use warnings; |
5 | use 5.008001; |
6 | |
71511651 |
7 | our $VERSION = '0.001001'; |
94caac6e |
8 | |
0ba8c7aa |
9 | # mirrored in Declare.xs as DD_HANDLE_* |
10 | |
11 | use constant DECLARE_NAME => 1; |
12 | use constant DECLARE_PROTO => 2; |
53e3ab32 |
13 | use constant DECLARE_NONE => 4; |
15d0d014 |
14 | use constant DECLARE_PACKAGE => 8+1; # name implicit |
0ba8c7aa |
15 | |
86c3de80 |
16 | use vars qw(%declarators %declarator_handlers @ISA); |
94caac6e |
17 | use base qw(DynaLoader); |
323ae557 |
18 | use Scalar::Util 'set_prototype'; |
94caac6e |
19 | |
20 | bootstrap Devel::Declare; |
21 | |
86c3de80 |
22 | @ISA = (); |
23 | |
94caac6e |
24 | sub import { |
0ba8c7aa |
25 | my ($class, %args) = @_; |
94caac6e |
26 | my $target = caller; |
0ba8c7aa |
27 | if (@_ == 1) { # "use Devel::Declare;" |
28 | no strict 'refs'; |
15d0d014 |
29 | foreach my $name (qw(NAME PROTO NONE PACKAGE)) { |
53e3ab32 |
30 | *{"${target}::DECLARE_${name}"} = *{"DECLARE_${name}"}; |
0ba8c7aa |
31 | } |
32 | } else { |
33 | $class->setup_for($target => \%args); |
34 | } |
94caac6e |
35 | } |
36 | |
37 | sub unimport { |
38 | my ($class) = @_; |
39 | my $target = caller; |
40 | $class->teardown_for($target); |
41 | } |
42 | |
43 | sub setup_for { |
44 | my ($class, $target, $args) = @_; |
45 | setup(); |
0ba8c7aa |
46 | foreach my $key (keys %$args) { |
47 | my $info = $args->{$key}; |
48 | my ($flags, $sub); |
49 | if (ref($info) eq 'ARRAY') { |
50 | ($flags, $sub) = @$info; |
51 | } elsif (ref($info) eq 'CODE') { |
52 | $flags = DECLARE_NAME; |
53 | $sub = $info; |
54 | } else { |
55 | die "Info for sub ${key} must be [ \$flags, \$sub ] or \$sub"; |
56 | } |
57 | $declarators{$target}{$key} = $flags; |
58 | $declarator_handlers{$target}{$key} = $sub; |
59 | } |
94caac6e |
60 | } |
61 | |
62 | sub teardown_for { |
63 | my ($class, $target) = @_; |
64 | delete $declarators{$target}; |
0ba8c7aa |
65 | delete $declarator_handlers{$target}; |
94caac6e |
66 | teardown(); |
67 | } |
68 | |
94caac6e |
69 | my $temp_name; |
0ba8c7aa |
70 | my $temp_save; |
94caac6e |
71 | |
72 | sub init_declare { |
9026391e |
73 | my ($usepack, $use, $inpack, $name, $proto) = @_; |
53e3ab32 |
74 | my ($name_h, $XX_h, $extra_code) |
9026391e |
75 | = $declarator_handlers{$usepack}{$use}->( |
76 | $usepack, $use, $inpack, $name, $proto, defined(wantarray) |
53e3ab32 |
77 | ); |
15d0d014 |
78 | ($temp_name, $temp_save) = ([], []); |
0ba8c7aa |
79 | if ($name) { |
9026391e |
80 | $name = "${inpack}::${name}" unless $name =~ /::/; |
0ba8c7aa |
81 | push(@$temp_name, $name); |
82 | no strict 'refs'; |
15d0d014 |
83 | push(@$temp_save, \&{$name}); |
0ba8c7aa |
84 | no warnings 'redefine'; |
85 | no warnings 'prototype'; |
15d0d014 |
86 | *{$name} = $name_h; |
0ba8c7aa |
87 | } |
88 | if ($XX_h) { |
9026391e |
89 | push(@$temp_name, "${inpack}::X"); |
0ba8c7aa |
90 | no strict 'refs'; |
9026391e |
91 | push(@$temp_save, \&{"${inpack}::X"}); |
0ba8c7aa |
92 | no warnings 'redefine'; |
93 | no warnings 'prototype'; |
9026391e |
94 | *{"${inpack}::X"} = $XX_h; |
0ba8c7aa |
95 | } |
53e3ab32 |
96 | if (defined wantarray) { |
97 | return $extra_code || '0;'; |
98 | } else { |
99 | return; |
100 | } |
94caac6e |
101 | } |
102 | |
103 | sub done_declare { |
104 | no strict 'refs'; |
86c3de80 |
105 | my $name = shift(@{$temp_name||[]}); |
0ba8c7aa |
106 | die "done_declare called with no temp_name stack" unless defined($name); |
86c3de80 |
107 | my $saved = shift(@$temp_save); |
15d0d014 |
108 | $name =~ s/(.*):://; |
109 | my $temp_pack = $1; |
0ba8c7aa |
110 | delete ${"${temp_pack}::"}{$name}; |
111 | if ($saved) { |
112 | no warnings 'prototype'; |
113 | *{"${temp_pack}::${name}"} = $saved; |
114 | } |
94caac6e |
115 | } |
116 | |
323ae557 |
117 | sub build_sub_installer { |
118 | my ($class, $pack, $name, $proto) = @_; |
119 | return eval " |
120 | package ${pack}; |
121 | my \$body; |
122 | sub ${name} (${proto}) :lvalue {\n" |
86c3de80 |
123 | .'my $ret = $body->(@_); |
124 | return $ret; |
323ae557 |
125 | }; |
126 | sub { ($body) = @_; };'; |
127 | } |
128 | |
129 | sub setup_declarators { |
130 | my ($class, $pack, $to_setup) = @_; |
86c3de80 |
131 | die "${class}->setup_declarators(\$pack, \\\%to_setup)" |
132 | unless defined($pack) && ref($to_setup) eq 'HASH'; |
133 | my %setup_for_args; |
323ae557 |
134 | foreach my $name (keys %$to_setup) { |
135 | my $info = $to_setup->{$name}; |
136 | my $flags = $info->{flags} || DECLARE_NAME; |
137 | my $run = $info->{run}; |
138 | my $compile = $info->{compile}; |
139 | my $proto = $info->{proto} || '&'; |
140 | my $sub_proto = $proto; |
141 | # make all args optional to enable lvalue for DECLARE_NONE |
142 | $sub_proto =~ s/;//; $sub_proto = ';'.$sub_proto; |
86c3de80 |
143 | #my $installer = $class->build_sub_installer($pack, $name, $proto); |
144 | my $installer = $class->build_sub_installer($pack, $name, '@'); |
145 | my $proto_maker = eval q! |
146 | sub { |
147 | my $body = shift; |
148 | sub (!.$sub_proto.q!) { |
149 | $body->(@_); |
150 | }; |
151 | }; |
152 | !; |
153 | $installer->(sub :lvalue { |
c5534496 |
154 | if (@_) { |
155 | if (ref $_[0] eq 'HASH') { |
156 | shift; |
157 | my $r = $run->(undef, undef, @_); |
158 | return $r; |
159 | } else { |
160 | return $_[1]; |
161 | } |
86c3de80 |
162 | } |
163 | return my $sv; |
164 | }); |
165 | $setup_for_args{$name} = [ |
166 | $flags, |
167 | sub { |
168 | my ($usepack, $use, $inpack, $name, $proto) = @_; |
169 | my $extra_code = $compile->($name, $proto); |
170 | my $main_handler = $proto_maker->(sub { |
c5534496 |
171 | ("DONE", $run->($name, $proto, @_)); |
86c3de80 |
172 | }); |
173 | my ($name_h, $XX); |
174 | if (defined $proto) { |
175 | $name_h = sub :lvalue { return my $sv; }; |
176 | $XX = $main_handler; |
c5534496 |
177 | } elsif (defined $name && length $name) { |
86c3de80 |
178 | $name_h = $main_handler; |
c5534496 |
179 | } else { |
180 | $extra_code ||= ''; |
181 | $extra_code = '}, sub {'.$extra_code; |
86c3de80 |
182 | } |
183 | return ($name_h, $XX, $extra_code); |
184 | } |
185 | ]; |
323ae557 |
186 | } |
86c3de80 |
187 | $class->setup_for($pack, \%setup_for_args); |
188 | } |
189 | |
190 | sub install_declarator { |
191 | my ($class, $target_pack, $target_name, $flags, $filter, $handler) = @_; |
192 | $class->setup_declarators($target_pack, { |
193 | $target_name => { |
194 | flags => $flags, |
195 | compile => $filter, |
196 | run => $handler, |
197 | } |
198 | }); |
323ae557 |
199 | } |
200 | |
94caac6e |
201 | =head1 NAME |
202 | |
203 | Devel::Declare - |
204 | |
205 | =head1 SYNOPSIS |
206 | |
207 | =head1 DESCRIPTION |
208 | |
209 | =head2 import |
210 | |
211 | use Devel::Declare qw(list of subs); |
212 | |
213 | Calls Devel::Declare->setup_for(__PACKAGE__ => \@list_of_subs); |
214 | |
215 | =head2 unimport |
216 | |
217 | no Devel::Declare; |
218 | |
219 | Calls Devel::Declare->teardown_for(__PACKAGE__); |
220 | |
221 | =head2 setup_for |
222 | |
223 | Devel::Declare->setup_for($package => \@subnames); |
224 | |
225 | Installs declarator magic (unless already installed) and registers |
226 | "${package}::$name" for each member of @subnames |
227 | |
228 | =head2 teardown_for |
229 | |
230 | Devel::Declare->teardown_for($package); |
231 | |
232 | Deregisters all subs currently registered for $package and uninstalls |
233 | declarator magic if number of teardown_for calls matches number of setup_for |
234 | calls. |
235 | |
236 | =head1 AUTHOR |
237 | |
02f5a508 |
238 | Matt S Trout - <mst@shadowcat.co.uk> |
94caac6e |
239 | |
02f5a508 |
240 | Company: http://www.shadowcat.co.uk/ |
94caac6e |
241 | Blog: http://chainsawblues.vox.com/ |
242 | |
243 | =head1 LICENSE |
244 | |
245 | This library is free software under the same terms as perl itself |
246 | |
247 | =cut |
248 | |
249 | 1; |