2 indirect - Lexically warn about using the indirect object syntax.
10 my $x = new Apple 1, 2, 3; # warns
13 my $y = new Pear; # ok
15 no indirect hook => sub { die "You really wanted $_[0]\->$_[1] at $_[2]:$_[3]" };
16 my $z = new Pineapple 'fresh'; # croaks 'You really wanted Pineapple->new at blurp.pm:13'
20 if (defied $foo) { ... } # croaks, note the typo
22 # From the command-line
23 perl -M-indirect -e 'my $x = new Banana;' # warns
25 # Or each time perl is ran
26 export PERL5OPT="-M-indirect"
27 perl -e 'my $y = new Coconut;' # warns
30 When enabled (or disabled as some may prefer to say, since you actually
31 turn it on by calling "no indirect"), this pragma warns about indirect
32 object syntax constructs that may have slipped into your code. This
33 syntax is now considered harmful, since its parsing has many quirks and
34 its use is error prone (when "swoosh" isn't defined, "swoosh $x"
35 actually compiles to "$x->swoosh").
37 It currently does not warn when the object is enclosed between braces
38 (like "meth { $obj } @args") or for core functions ("print" or "say").
39 This may change in the future, or may be added as optional features that
40 would be enabled by passing options to "unimport".
42 This module is not a source filter.
45 "unimport [ hook => $hook | ':fatal' ]"
46 Magically called when "no indirect @opts" is encountered. Turns the
47 module on. The policy to apply depends on what is first found in @opts :
49 * If it's the string ':fatal', the compilation will croak on the first
52 * If the key/value pair "hook => $hook" comes first, $hook will be
53 called for each error with the object name as $_[0], the method name
54 as $_[1], the current file as $_[2] and the line number as $_[3].
56 * Otherwise, a warning will be emitted for each indirect construct.
59 Magically called at each "use indirect". Turns the module off.
63 True iff the module could have been built with thread-safety features
67 The implementation was tweaked to work around several limitations of
68 vanilla "perl" pragmas : it's thread safe, and doesn't suffer from a
69 "perl 5.8.x-5.10.0" bug that causes all pragmas to propagate into
72 "meth $obj" (no semicolon) at the end of a file won't be seen as an
73 indirect object syntax, although it will as soon as there is another
74 token before the end (as in "meth $obj;" or "meth $obj 1").
76 With 5.8 perls, the pragma does not propagate into "eval STRING". This
77 is due to a shortcoming in the way perl handles the hints hash, which is
78 addressed in perl 5.10.
83 XSLoader (standard since perl 5.006).
86 Vincent Pit, "<perl at profvince.com>", <http://www.profvince.com>.
88 You can contact me by mail or on "irc.perl.org" (vincent).
91 Please report any bugs or feature requests to "bug-indirect at
92 rt.cpan.org", or through the web interface at
93 <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=indirect>. I will be
94 notified, and then you'll automatically be notified of progress on your
95 bug as I make changes.
98 You can find documentation for this module with the perldoc command.
102 Tests code coverage report is available at
103 <http://www.profvince.com/perl/cover/indirect>.
106 Bram, for motivation and advices.
109 Copyright 2008-2009 Vincent Pit, all rights reserved.
111 This program is free software; you can redistribute it and/or modify it
112 under the same terms as Perl itself.