# 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](
https://metacpan.org/pod/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](
https://metacpan.org/pod/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](
https://metacpan.org/pod/version) object, `undef` if no dependencies could be found.
- `$p->minimum_syntax_version()`
The `minimum_syntax_version` method will explicitly test only the
Document's syntax to determine it's minimum version, to the extent
that this is possible.
Returns a [version](
https://metacpan.org/pod/version) object, `undef` if no dependencies could be found.
- version\_markers
This method returns a list of pairs in the form:
($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](
https://metacpan.org/pod/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](
https://metacpan.org/pod/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](
https://metacpan.org/pod/Perl::MinimumVersion).
# AUTHOR
tokuhirom <
[email protected]>
# SEE ALSO
This module using [Compiler::Lexer](
https://metacpan.org/pod/Compiler::Lexer) as a lexer for Perl5 code.
This module is inspired from [Perl::MinimumVersion](
https://metacpan.org/pod/Perl::MinimumVersion).
