1 package Devel::Declare;
7 our $VERSION = '0.002002';
9 use constant DECLARE_NAME => 1;
10 use constant DECLARE_PROTO => 2;
11 use constant DECLARE_NONE => 4;
12 use constant DECLARE_PACKAGE => 8+1; # name implicit
14 use vars qw(%declarators %declarator_handlers @ISA);
15 use base qw(DynaLoader);
16 use Scalar::Util 'set_prototype';
17 use B::Hooks::OP::Check;
20 bootstrap Devel::Declare;
24 # temporary backcompat
26 for (qw/get_linestr get_linestr_offset set_linestr/) {
28 *{ $_ } = B::Hooks::Parser->can($_);
33 my ($class, %args) = @_;
35 if (@_ == 1) { # "use Devel::Declare;"
37 foreach my $name (qw(NAME PROTO NONE PACKAGE)) {
38 *{"${target}::DECLARE_${name}"} = *{"DECLARE_${name}"};
41 $class->setup_for($target => \%args);
48 $class->teardown_for($target);
52 my ($class, $target, $args) = @_;
54 foreach my $key (keys %$args) {
55 my $info = $args->{$key};
57 if (ref($info) eq 'ARRAY') {
58 ($flags, $sub) = @$info;
59 } elsif (ref($info) eq 'CODE') {
60 $flags = DECLARE_NAME;
62 } elsif (ref($info) eq 'HASH') {
66 die "Info for sub ${key} must be [ \$flags, \$sub ] or \$sub or handler hashref";
68 $declarators{$target}{$key} = $flags;
69 $declarator_handlers{$target}{$key} = $sub;
74 my ($class, $target) = @_;
75 delete $declarators{$target};
76 delete $declarator_handlers{$target};
83 my ($usepack, $use, $inpack, $name, $proto, $traits) = @_;
84 my ($name_h, $XX_h, $extra_code)
85 = $declarator_handlers{$usepack}{$use}->(
86 $usepack, $use, $inpack, $name, $proto, defined(wantarray), $traits
88 ($temp_name, $temp_save) = ([], []);
90 $name = "${inpack}::${name}" unless $name =~ /::/;
91 shadow_sub($name, $name_h);
94 shadow_sub("${inpack}::X", $XX_h);
96 if (defined wantarray) {
97 return $extra_code || '0;';
104 my ($name, $cr) = @_;
105 push(@$temp_name, $name);
107 my ($pack, $pname) = ($name =~ m/(.+)::([^:]+)/);
108 push(@$temp_save, $pack->can($pname));
109 delete ${"${pack}::"}{$pname};
110 no warnings 'redefine';
111 no warnings 'prototype';
113 set_in_declare(~~@{$temp_name||[]});
118 my $name = shift(@{$temp_name||[]});
119 die "done_declare called with no temp_name stack" unless defined($name);
120 my $saved = shift(@$temp_save);
123 delete ${"${temp_pack}::"}{$name};
125 no warnings 'prototype';
126 *{"${temp_pack}::${name}"} = $saved;
128 set_in_declare(~~@{$temp_name||[]});
131 sub build_sub_installer {
132 my ($class, $pack, $name, $proto) = @_;
136 sub ${name} (${proto}) :lvalue {\n"
140 my $ret = $body->(@_);
143 sub { ($body) = @_; };';
146 sub setup_declarators {
147 my ($class, $pack, $to_setup) = @_;
148 die "${class}->setup_declarators(\$pack, \\\%to_setup)"
149 unless defined($pack) && ref($to_setup) eq 'HASH';
151 foreach my $name (keys %$to_setup) {
152 my $info = $to_setup->{$name};
153 my $flags = $info->{flags} || DECLARE_NAME;
154 my $run = $info->{run};
155 my $compile = $info->{compile};
156 my $proto = $info->{proto} || '&';
157 my $sub_proto = $proto;
158 # make all args optional to enable lvalue for DECLARE_NONE
159 $sub_proto =~ s/;//; $sub_proto = ';'.$sub_proto;
160 #my $installer = $class->build_sub_installer($pack, $name, $proto);
161 my $installer = $class->build_sub_installer($pack, $name, '@');
162 $installer->(sub :lvalue {
163 #{ no warnings 'uninitialized'; warn 'INST: '.join(', ', @_)."\n"; }
165 if (ref $_[0] eq 'HASH') {
168 my @ret = $run->(undef, undef, @_);
171 my $r = $run->(undef, undef, @_);
179 $setup_for_args{$name} = [
182 my ($usepack, $use, $inpack, $name, $proto, $shift_hashref, $traits) = @_;
183 my $extra_code = $compile->($name, $proto, $traits);
184 my $main_handler = sub { shift if $shift_hashref;
185 ("DONE", $run->($name, $proto, @_));
188 if (defined $proto) {
189 $name_h = sub :lvalue { return my $sv; };
191 } elsif (defined $name && length $name) {
192 $name_h = $main_handler;
195 $extra_code = '}, sub {'.$extra_code;
196 return ($name_h, $XX, $extra_code);
200 $class->setup_for($pack, \%setup_for_args);
203 sub install_declarator {
204 my ($class, $target_pack, $target_name, $flags, $filter, $handler) = @_;
205 $class->setup_declarators($target_pack, {
214 sub linestr_callback_rv2cv {
215 my ($name, $offset) = @_;
216 $offset += toke_move_past_token($offset);
217 my $pack = get_curstash_name();
218 my $flags = $declarators{$pack}{$name};
219 my ($found_name, $found_proto);
220 if ($flags & DECLARE_NAME) {
221 $offset += toke_skipspace($offset);
222 my $linestr = get_linestr();
223 if (substr($linestr, $offset, 2) eq '::') {
224 substr($linestr, $offset, 2) = '';
225 set_linestr($linestr);
227 if (my $len = toke_scan_word($offset, $flags & DECLARE_PACKAGE)) {
228 $found_name = substr($linestr, $offset, $len);
232 if ($flags & DECLARE_PROTO) {
233 $offset += toke_skipspace($offset);
234 my $linestr = get_linestr();
235 if (substr($linestr, $offset, 1) eq '(') {
236 my $length = toke_scan_str($offset);
237 $found_proto = get_lex_stuff();
240 ($found_name ? ' ' : '=')
241 .'X'.(' ' x length($found_proto));
242 $linestr = get_linestr();
243 substr($linestr, $offset, $length) = $replace;
244 set_linestr($linestr);
248 my @args = ($pack, $name, $pack, $found_name, $found_proto);
249 $offset += toke_skipspace($offset);
250 my $linestr = get_linestr();
251 if (substr($linestr, $offset, 1) eq '{') {
252 my $ret = init_declare(@args);
254 if (defined $ret && length $ret) {
255 substr($linestr, $offset, 0) = $ret;
256 set_linestr($linestr);
261 #warn "linestr now ${linestr}";
264 sub linestr_callback_const {
265 my ($name, $offset) = @_;
266 my $pack = get_curstash_name();
267 my $flags = $declarators{$pack}{$name};
268 if ($flags & DECLARE_NAME) {
269 $offset += toke_move_past_token($offset);
270 $offset += toke_skipspace($offset);
271 if (toke_scan_word($offset, $flags & DECLARE_PACKAGE)) {
272 my $linestr = get_linestr();
273 substr($linestr, $offset, 0) = '::';
274 set_linestr($linestr);
279 sub linestr_callback {
282 my $pack = get_curstash_name();
283 my $handlers = $declarator_handlers{$pack}{$name};
284 if (ref $handlers eq 'CODE') {
285 my $meth = "linestr_callback_${type}";
286 __PACKAGE__->can($meth)->(@_);
287 } elsif (ref $handlers eq 'HASH') {
288 if ($handlers->{$type}) {
289 $handlers->{$type}->(@_);
292 die "PANIC: unknown thing in handlers for $pack $name: $handlers";
302 use Devel::Declare ();
305 package MethodHandlers;
309 use B::Hooks::EndOfScope;
311 our ($Declarator, $Offset);
313 sub skip_declarator {
314 $Offset += Devel::Declare::toke_move_past_token($Offset);
318 $Offset += Devel::Declare::toke_skipspace($Offset);
323 if (my $len = Devel::Declare::toke_scan_word($Offset, 1)) {
324 my $linestr = Devel::Declare::get_linestr();
325 my $name = substr($linestr, $Offset, $len);
326 substr($linestr, $Offset, $len) = '';
327 Devel::Declare::set_linestr($linestr);
336 my $linestr = Devel::Declare::get_linestr();
337 if (substr($linestr, $Offset, 1) eq '(') {
338 my $length = Devel::Declare::toke_scan_str($Offset);
339 my $proto = Devel::Declare::get_lex_stuff();
340 Devel::Declare::clear_lex_stuff();
341 $linestr = Devel::Declare::get_linestr();
342 substr($linestr, $Offset, $length) = '';
343 Devel::Declare::set_linestr($linestr);
350 my $pack = Devel::Declare::get_curstash_name;
351 Devel::Declare::shadow_sub("${pack}::${Declarator}", $_[0]);
354 # undef -> my ($self) = shift;
355 # '' -> my ($self) = @_;
356 # '$foo' -> my ($self, $foo) = @_;
358 sub make_proto_unwrap {
360 my $inject = 'my ($self';
361 if (defined $proto) {
362 $inject .= ", $proto" if length($proto);
363 $inject .= ') = @_; ';
365 $inject .= ') = shift;';
370 sub inject_if_block {
373 my $linestr = Devel::Declare::get_linestr;
374 if (substr($linestr, $Offset, 1) eq '{') {
375 substr($linestr, $Offset+1, 0) = $inject;
376 Devel::Declare::set_linestr($linestr);
380 sub scope_injector_call {
381 return ' BEGIN { MethodHandlers::inject_scope }; ';
385 local ($Declarator, $Offset) = @_;
387 my $name = strip_name;
388 my $proto = strip_proto;
389 my $inject = make_proto_unwrap($proto);
391 $inject = scope_injector_call().$inject;
393 inject_if_block($inject);
395 $name = join('::', Devel::Declare::get_curstash_name(), $name)
396 unless ($name =~ /::/);
397 shadow(sub (&) { no strict 'refs'; *{$name} = shift; });
399 shadow(sub (&) { shift });
405 my $linestr = Devel::Declare::get_linestr;
406 my $offset = Devel::Declare::get_linestr_offset;
407 substr($linestr, $offset, 0) = ';';
408 Devel::Declare::set_linestr($linestr);
413 my ($test_method1, $test_method2, @test_list);
421 Devel::Declare->setup_for(
423 { method => { const => \&MethodHandlers::parser } }
428 my $class = ref $self || $self;
429 return bless({ @_ }, $class);
433 return (ref $self).': Foo: '.$foo;
436 method upgrade(){ # no spaces to make case pathological
437 bless($self, 'DeclareTest2');
440 method DeclareTest2::bar () {
441 return 'DeclareTest2: bar';
444 $test_method1 = method {
445 return join(', ', $self->{attr}, $_[1]);
448 $test_method2 = method ($what) {
449 return join(', ', ref $self, $what);
452 method main () { return "main"; }
454 @test_list = (method { 1 }, sub { 2 }, method () { 3 }, sub { 4 });
458 use Test::More 'no_plan';
460 my $o = DeclareTest->new(attr => "value");
462 isa_ok($o, 'DeclareTest');
464 is($o->{attr}, 'value', '@_ args ok');
466 is($o->foo('yay'), 'DeclareTest: Foo: yay', 'method with argument ok');
468 is($o->main, 'main', 'declaration of package named method ok');
472 isa_ok($o, 'DeclareTest2');
474 is($o->bar, 'DeclareTest2: bar', 'absolute method declaration ok');
476 is($o->$test_method1('no', 'yes'), 'value, yes', 'anon method with @_ ok');
478 is($o->$test_method2('this'), 'DeclareTest2, this', 'anon method with proto ok');
480 is_deeply([ map { $_->() } @test_list ], [ 1, 2, 3, 4], 'binding ok');
482 (this is t/method-no-semi.t in this distribution)
488 Devel::Declare->setup_for(
491 $name => { $op_type => $sub }
495 Currently valid op types: 'check', 'rv2cv'
499 Matt S Trout - <mst@shadowcat.co.uk>
501 Company: http://www.shadowcat.co.uk/
502 Blog: http://chainsawblues.vox.com/
504 Florian Ragwitz E<lt>rafl@debian.orgE<gt>
508 This library is free software under the same terms as perl itself