NAME
    indirect - Lexically warn about using the indirect object syntax.

VERSION
    Version 0.16

SYNOPSIS
        # In a script
        no indirect;
        my $x = new Apple 1, 2, 3; # warns
        {
         use indirect;
         my $y = new Pear; # ok
         {
          no indirect hook => sub { die "You really wanted $_[0]\->$_[1] at $_[2]:$_[3]" };
          my $z = new Pineapple 'fresh'; # croaks 'You really wanted Pineapple->new at blurp.pm:13'
         }
        }
        try { ... }; # warns

        no indirect ':fatal';
        if (defied $foo) { ... } # croaks, note the typo

        # From the command-line
        perl -M-indirect -e 'my $x = new Banana;' # warns

        # Or each time perl is ran
        export PERL5OPT="-M-indirect"
        perl -e 'my $y = new Coconut;' # warns

DESCRIPTION
    When enabled (or disabled as some may prefer to say, since you actually
    turn it on by calling "no indirect"), this pragma warns about indirect
    object syntax constructs that may have slipped into your code. This
    syntax is now considered harmful, since its parsing has many quirks and
    its use is error prone (when "swoosh" isn't defined, "swoosh $x"
    actually compiles to "$x->swoosh").

    It currently does not warn for core functions ("print", "say", "exec" or
    "system"). This may change in the future, or may be added as optional
    features that would be enabled by passing options to "unimport".

    This module is not a source filter.

METHODS
  "unimport [ hook => $hook | ':fatal' ]"
    Magically called when "no indirect @opts" is encountered. Turns the
    module on. The policy to apply depends on what is first found in @opts :

    *   If it's the string ':fatal', the compilation will croak on the first
        indirect syntax met.

    *   If the key/value pair "hook => $hook" comes first, $hook will be
        called for each error with a string representation of the object as
        $_[0], the method name as $_[1], the current file as $_[2] and the
        line number as $_[3]. If and only if the object is actually a block,
        $_[0] is assured to start by '{'.

    *   Otherwise, a warning will be emitted for each indirect construct.

  "import"
    Magically called at each "use indirect". Turns the module off.

FUNCTIONS
  "msg $object, $method, $file, $line"
    Returns the default error message generated by "indirect" when an
    invalid construct is reported.

CONSTANTS
  "I_THREADSAFE"
    True iff the module could have been built with thread-safety features
    enabled.

DIAGNOSTICS
  "Indirect call of method "%s" on object "%s" at %s line %d."
    The default warning/exception message thrown when an indirect call on an
    object is found.

  "Indirect call of method "%s" on a block at %s line %d."
    The default warning/exception message thrown when an indirect call on a
    block is found.

CAVEATS
    The implementation was tweaked to work around several limitations of
    vanilla "perl" pragmas : it's thread safe, and doesn't suffer from a
    "perl 5.8.x-5.10.0" bug that causes all pragmas to propagate into
    "require"d scopes.

    "meth $obj" (no semicolon) at the end of a file won't be seen as an
    indirect object syntax, although it will as soon as there is another
    token before the end (as in "meth $obj;" or "meth $obj 1").

    With 5.8 perls, the pragma does not propagate into "eval STRING". This
    is due to a shortcoming in the way perl handles the hints hash, which is
    addressed in perl 5.10.

DEPENDENCIES
    perl 5.8.

    XSLoader (standard since perl 5.006).

AUTHOR
    Vincent Pit, "<perl at profvince.com>", <http://www.profvince.com>.

    You can contact me by mail or on "irc.perl.org" (vincent).

BUGS
    Please report any bugs or feature requests to "bug-indirect at
    rt.cpan.org", or through the web interface at
    <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=indirect>. I will be
    notified, and then you'll automatically be notified of progress on your
    bug as I make changes.

SUPPORT
    You can find documentation for this module with the perldoc command.

        perldoc indirect

    Tests code coverage report is available at
    <http://www.profvince.com/perl/cover/indirect>.

ACKNOWLEDGEMENTS
    Bram, for motivation and advices.

    Andrew Main and Florian Ragwitz, for testing on real-life code and
    reporting issues.

COPYRIGHT & LICENSE
    Copyright 2008-2009 Vincent Pit, all rights reserved.

    This program is free software; you can redistribute it and/or modify it
    under the same terms as Perl itself.