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.