NAME

Perl::MinimumVersion::Fast - Find a minimum required version of perl for Perl code

SYNOPSIS

use Perl::MinimumVersion::Fast;

my $p = Perl::MinimumVersion::Fast->new($filename);
print $p->minimum_version, "\n";

DESCRIPTION

"Perl::MinimumVersion::Fast" takes Perl source code and calculates the minimum version of perl required to be able to run it. Because it is based on goccy's Compiler::Lexer, it can do this without having to actually load the code.

Perl::MinimumVersion::Fast is an alternative fast & lightweight implementation of Perl::MinimumVersion.

This module supports only Perl 5.8.1+. If you want to support Perl 5.6, use Perl::MinimumVersion instead.

In 2013, you don't need to support Perl 5.6 in most of case.

METHODS

• my $p = Perl::MinimumVersion::Fast->new($filename);

• my $p = Perl::MinimumVersion::Fast->new(\$src);

  Create new instance. You can create object from $filename and \$src in string.

• $p->minimum_version();

  Get a minimum perl version the code required.

• $p->minimum_explicit_version()

  The minimum_explicit_version method checks through Perl code for the use of explicit version dependencies such as.

    use 5.006;
    require 5.005_03;
  

  Although there is almost always only one of these in a file, if more than one are found, the highest version dependency will be returned.

  Returns a version object, undef if no dependencies could be found.

• $p->minimum_syntax_version()

  The minimum_syntax_version method will explicitly test only the Document's syntax to determine it's minimum version, to the extent that this is possible.

  Returns a version object, undef if no dependencies could be found.

• version_markers

  This method returns a list of pairs in the form:

    ($version, \@markers)
  

  Each pair represents all the markers that could be found indicating that the version was the minimum needed version. @markers is an array of strings. Currently, these strings are not as clear as they might be, but this may be changed in the future. In other words: don't rely on them as specific identifiers.

BENCHMARK

Perl::MinimumVersion::Fast is faster than Perl::MinimumVersion. Because Perl::MinimumVersion::Fast uses Compiler::Lexer, that is a Perl5 lexer implemented in C++. And Perl::MinimumVersion::Fast omits some features implemented in Perl::MinimumVersion.

But, but, Perl::MinimumVersion::Fast is really fast.

                            Rate Perl::MinimumVersion Perl::MinimumVersion::Fast
Perl::MinimumVersion       5.26/s                   --                       -97%
Perl::MinimumVersion::Fast  182/s                3365%                         --

LICENSE

Copyright (C) tokuhirom.

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

THANKS TO

Most of documents are taken from Perl::MinimumVersion.

AUTHOR

tokuhirom tokuhirom@gmail.com

SEE ALSO

This module using Compiler::Lexer as a lexer for Perl5 code.

This module is inspired from Perl::MinimumVersion.