#NAME

Perl::PrereqScanner - a tool to scan your Perl code for its prerequisites

#VERSION

version 1.100

#SYNOPSIS

use Perl::PrereqScanner;
my $scanner = Perl::PrereqScanner->new;
my $prereqs = $scanner->scan_ppi_document( $ppi_doc );
my $prereqs = $scanner->scan_file( $file_path );
my $prereqs = $scanner->scan_string( $perl_code );
my $prereqs = $scanner->scan_module( $module_name );

#DESCRIPTION

The scanner will extract loosely your distribution prerequisites from your files.

The extraction may not be perfect but tries to do its best. It will currently find the following prereqs:

plain lines beginning with use or require in your perl modules and scripts, including minimum perl version
regular inheritance declared with the base and parent pragmata
Moose inheritance declared with the extends keyword
Moose roles included with the with keyword
OO namespace aliasing using the aliased module

#Scanner Plugins

Perl::PrereqScanner works by running a series of scanners over a PPI::Document representing the code to scan. By default the "Perl5", "Moose", "TestMore", "POE", and "Aliased" scanners are run. You can supply your own scanners when constructing your PrereqScanner:

# Us only the Perl5 scanner:
my $scanner = Perl::PrereqScanner->new({ scanners => [ qw(Perl5) ] });

# Use any stock scanners, plus Example:
my $scanner = Perl::PrereqScanner->new({ extra_scanners => [ qw(Example) ] });

#PERL VERSION

This library should run on perls released even a long time ago. It should work on any version of perl released in the last five years.

Although it may work on older versions of perl, no guarantee is made that the minimum required version will not be increased. The version may be increased for any reason, and there is no promise that patches will be accepted to lower the minimum required perl.

#METHODS

#scan_string

my $prereqs = $scanner->scan_string( $perl_code );

Given a string containing Perl source code, this method returns a CPAN::Meta::Requirements object describing the modules it requires.

This method will throw an exception if PPI fails to parse the code.

Warning! It isn't entirely clear whether PPI prefers to receive strings as octet strings or character strings. For now, my advice is to pass octet strings.

#scan_file

my $prereqs = $scanner->scan_file( $path );

Given a file path to a Perl document, this method returns a CPAN::Meta::Requirements object describing the modules it requires.

This method will throw an exception if PPI fails to parse the code.

#scan_ppi_document

my $prereqs = $scanner->scan_ppi_document( $ppi_doc );

Given a PPI::Document, this method returns a CPAN::Meta::Requirements object describing the modules it requires.

#scan_module

my $prereqs = $scanner->scan_module( $module_name );

Given the name of a module, eg 'PPI::Document', this method returns a CPAN::Meta::Requirements object describing the modules it requires.

#SEE ALSO

scan-perl-prereqs, in this distribution, is a command-line interface to the scanner

#AUTHORS

Jerome Quelin
Ricardo Signes <cpan@semiotic.systems>

#CONTRIBUTORS

bowtie <bowtie@cpan.org>
celogeek <me@celogeek.com>
Christopher J. Madsen <perl@cjmweb.net>
Dan Book <grinnz@grinnz.com>
David Golden <dagolden@cpan.org>
David Steinbrunner <dsteinbrunner@pobox.com>
Ed J <mohawk2@users.noreply.github.com>
Florian Ragwitz <rafl@debian.org>
Jakob Voss <voss@gbv.de>
Jérôme Quelin <jquelin@gmail.com>
John SJ Anderson <genehack@genehack.org>
Karen Etheridge <ether@cpan.org>
Mark Gardner <gardnerm@gsicommerce.com>
Neil Bowers <neil@bowers.com>
Randy Stauner <rwstauner@cpan.org>
Ricardo Signes <rjbs@semiotic.systems>
Tina Mueller <tinita@cpan.org>
Vyacheslav Matjukhin <mmcleric@yandex-team.ru>

#COPYRIGHT AND LICENSE

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

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