11 use Symbol qw/gensym/;
13 use Variable::Magic qw/wizard cast dispell getdata/;
17 subs::auto - Read barewords as subroutine names.
25 our $VERSION = '0.05';
31 foo; # Compile to "foo()" instead of "'foo'"
32 # or croaking on strict subs
33 foo $x; # Compile to "foo($x)" instead of "$x->foo"
34 foo 1; # Compile to "foo(1)" instead of croaking
35 foo 1, 2; # Compile to "foo(1, 2)" instead of croaking
37 foo->meth; # "'foo'->meth" if you have use'd foo somewhere,
38 # or "foo()->meth" otherwise
39 print foo 'wut'; # print to the filehandle foo if it's actually one,
40 # or "print(foo('wut'))" otherwise
41 } # ... but function calls will fail at run-time if you don't
42 # actually define foo somewhere
48 This pragma lexically enables the parsing of any bareword as a subroutine name, except those which corresponds to an entry in C<%INC> (expected to be class names) or whose symbol table entry has an IO slot (expected to be filehandles).
50 You can pass options to C<import> as key / value pairs :
58 Specifies on which package the pragma should act. Setting C<$pkg> to C<Some::Package> allows you to resolve all functions name of the type C<Some::Package::func ...> in the current scope. You can use the pragma several times with different package names to allow resolution of all the corresponding barewords. Defaults to the current package.
62 This module is B<not> a source filter.
67 croak 'uvar magic not available' unless Variable::Magic::VMG_UVAR;
72 @B::Keywords::Barewords,
73 @B::Keywords::Functions,
76 delete @core{qw/my local/};
79 *_REFCNT_PLACEHOLDERS = eval 'sub () { ' . ($] < 5.011002 ? 0 : 1) . '}'
82 my $tag = wizard data => sub { \(my $data = _REFCNT_PLACEHOLDERS ? 2 : 1) };
85 my ($pkg, $func) = @_;
86 my $fqn = join '::', @_;
92 if ($cb and defined(my $data = getdata(&$cb, $tag))) {
97 for (qw/SCALAR ARRAY HASH IO FORMAT/) {
99 *$sym = *$fqn{$_} if defined *$fqn{$_}
107 (undef, my $data, my $func) = @_;
108 return if $data->{guard} or $func =~ /::/ or exists $core{$func};
109 local $data->{guard} = 1;
110 my $hints = (caller 0)[10];
111 if ($hints and $hints->{subs__auto}) {
112 my $mod = $func . '.pm';
113 if (not exists $INC{$mod}) {
114 my $fqn = $data->{pkg} . '::' . $func;
115 my $cb = do { no strict 'refs'; *$fqn{CODE} };
117 if (_REFCNT_PLACEHOLDERS and defined(my $data = getdata(&$cb, $tag))) {
122 return if do { no strict 'refs'; *$fqn{IO} };
124 my ($file, $line) = (caller 0)[1, 2];
125 ($file, $line) = ('(eval 0)', 0) unless $file && $line;
126 die "Undefined subroutine &$fqn called at $file line $line\n";
133 _reset($data->{pkg}, $func);
139 (undef, my $data, my $func) = @_;
140 return if $data->{guard};
141 local $data->{guard} = 1;
142 _reset($data->{pkg}, $func);
146 my $wiz = wizard data => sub { +{ pkg => $_[1], guard => 0 } },
153 my ($pkg, $cur) = @_;
154 return $cur unless $pkg;
155 croak 'Invalid package name' if ref $pkg
156 or $pkg =~ /(?:-|[^\w:])/
157 or $pkg =~ /(?:\A\d|\b:(?::\d|(?:::+)?\b))/;
159 $pkg = $cur . $pkg if $pkg eq '' or $pkg =~ /^::/;
165 croak 'Optional arguments must be passed as keys/values pairs' if @_ % 2;
167 my $cur = (caller 1)[0];
168 my $in = _validate_pkg $args{in}, $cur;
172 cast %{$in . '::'}, $wiz, $in;
183 dispell %{$_ . '::'}, $wiz for keys %pkgs;
193 C<*{'::foo'}{CODE}> will appear as defined in a scope where the pragma is enabled, C<foo> is used as a bareword, but is never actually defined afterwards. This may or may not be considered as Doing The Right Thing. However, C<*{'::foo'}{CODE}> will always return the right value if you fetch it outside the pragma's scope. Actually, you can make it return the right value even in the pragma's scope by reading C<*{'::foo'}{CODE}> outside (or by actually defining C<foo>, which is ultimately why you use this pragma, right ?).
195 You have to open global filehandles outside of the scope of this pragma if you want them not to be treated as function calls. Or just use lexical filehandles and default ones as you should be.
201 L<Carp> (standard since perl 5), L<Symbol> (since 5.002).
203 L<Variable::Magic> with C<uvar> magic enabled (this should be assured by the required perl version).
209 Vincent Pit, C<< <perl at profvince.com> >>, L<http://www.profvince.com>.
211 You can contact me by mail or on C<irc.perl.org> (vincent).
215 Please report any bugs or feature requests to C<bug-subs-auto at rt.cpan.org>, or through the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=subs-auto>. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
219 You can find documentation for this module with the perldoc command.
223 Tests code coverage report is available at L<http://www.profvince.com/perl/cover/subs-auto>.
225 =head1 ACKNOWLEDGEMENTS
227 Thanks to Sebastien Aperghis-Tramoni for helping to name this pragma.
229 =head1 COPYRIGHT & LICENSE
231 Copyright 2008 Vincent Pit, all rights reserved.
233 This program is free software; you can redistribute it and/or modify it
234 under the same terms as Perl itself.
238 1; # End of subs::auto