/ 
Perl-PrereqScanner-1.019
River stage three • 23 direct dependents • 747 total dependents
/ Perl::PrereqScanner

NAME

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

VERSION

version 1.019

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) ] });

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 <rjbs@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2009 by Jerome Quelin.

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