Module::Metadata(3perl) Perl Programmers Reference GuideModule::Metadata(3perl)
NAME
Module::Metadata - Gather package and POD information from perl module
files
VERSION
version 1.000038
SYNOPSIS
use Module::Metadata;
# information about a .pm file
my $info = Module::Metadata->new_from_file( $file );
my $version = $info->version;
# CPAN META 'provides' field for .pm files in a directory
my $provides = Module::Metadata->provides(
dir => 'lib', version => 2
);
DESCRIPTION
This module provides a standard way to gather metadata about a .pm file
through (mostly) static analysis and (some) code execution. When
determining the version of a module, the $VERSION assignment is
"eval"ed, as is traditional in the CPAN toolchain.
CLASS METHODS
"new_from_file($filename, collect_pod => 1, decode_pod => 1)"
Constructs a "Module::Metadata" object given the path to a file.
Returns undef if the filename does not exist.
"collect_pod" is a optional boolean argument that determines whether POD
data is collected and stored for reference. POD data is not collected
by default. POD headings are always collected.
If the file begins by an UTF-8, UTF-16BE or UTF-16LE byte-order mark,
then it is skipped before processing, and the content of the file is
also decoded appropriately starting from perl 5.8.
Alternatively, if "decode_pod" is set, it will decode the collected pod
sections according to the "=encoding" declaration.
"new_from_handle($handle, $filename, collect_pod => 1, decode_pod => 1)"
This works just like "new_from_file", except that a handle can be
provided as the first argument.
Note that there is no validation to confirm that the handle is a handle
or something that can act like one. Passing something that isn't a
handle will cause a exception when trying to read from it. The
"filename" argument is mandatory or undef will be returned.
You are responsible for setting the decoding layers on $handle if
required.
"new_from_module($module, collect_pod => 1, inc => \@dirs, decode_pod => 1)"
Constructs a "Module::Metadata" object given a module or package name.
Returns undef if the module cannot be found.
In addition to accepting the "collect_pod" and "decode_pod" arguments as
described above, this method accepts a "inc" argument which is a
reference to an array of directories to search for the module. If none
are given, the default is @INC.
If the file that contains the module begins by an UTF-8, UTF-16BE or
UTF-16LE byte-order mark, then it is skipped before processing, and the
content of the file is also decoded appropriately starting from perl
5.8.
"find_module_by_name($module, \@dirs)"
Returns the path to a module given the module or package name. A list of
directories can be passed in as an optional parameter, otherwise @INC is
searched.
Can be called as either an object or a class method.
"find_module_dir_by_name($module, \@dirs)"
Returns the entry in @dirs (or @INC by default) that contains the module
$module. A list of directories can be passed in as an optional
parameter, otherwise @INC is searched.
Can be called as either an object or a class method.
provides( %options )
This is a convenience wrapper around "package_versions_from_directory"
to generate a CPAN META "provides" data structure. It takes key/value
pairs. Valid option keys include:
version (required)
Specifies which version of the CPAN::Meta::Spec should be used as
the format of the "provides" output. Currently only '1.4' and '2'
are supported (and their format is identical). This may change in
the future as the definition of "provides" changes.
The "version" option is required. If it is omitted or if an
unsupported version is given, then "provides" will throw an error.
dir Directory to search recursively for .pm files. May not be specified
with "files".
files
Array reference of files to examine. May not be specified with
"dir".
prefix
String to prepend to the "file" field of the resulting output. This
defaults to lib, which is the common case for most CPAN
distributions with their .pm files in lib. This option ensures the
META information has the correct relative path even when the "dir"
or "files" arguments are absolute or have relative paths from a
location other than the distribution root.
For example, given "dir" of 'lib' and "prefix" of 'lib', the return
value is a hashref of the form:
{
'Package::Name' => {
version => '0.123',
file => 'lib/Package/Name.pm'
},
'OtherPackage::Name' => ...
}
"package_versions_from_directory($dir, \@files?)"
Scans $dir for .pm files (unless @files is given, in which case looks
for those files in $dir - and reads each file for packages and versions,
returning a hashref of the form:
{
'Package::Name' => {
version => '0.123',
file => 'Package/Name.pm'
},
'OtherPackage::Name' => ...
}
The "DB" and "main" packages are always omitted, as are any "private"
packages that have leading underscores in the namespace (e.g.
"Foo::_private")
Note that the file path is relative to $dir if that is specified. This
must not be used directly for CPAN META "provides". See the "provides"
method instead.
"log_info (internal)"
Used internally to perform logging; imported from Log::Contextual if
Log::Contextual has already been loaded, otherwise simply calls warn.
OBJECT METHODS
name()
Returns the name of the package represented by this module. If there is
more than one package, it makes a best guess based on the filename. If
it's a script (i.e. not a *.pm) the package name is 'main'.
version($package)
Returns the version as defined by the $VERSION variable for the package
as returned by the "name" method if no arguments are given. If given the
name of a package it will attempt to return the version of that package
if it is specified in the file.
filename()
Returns the absolute path to the file. Note that this file may not
actually exist on disk yet, e.g. if the module was read from an in-
memory filehandle.
packages_inside()
Returns a list of packages. Note: this is a raw list of packages
discovered (or assumed, in the case of "main"). It is not filtered for
"DB", "main" or private packages the way the "provides" method does.
Invalid package names are not returned, for example "Foo:Bar". Strange
but valid package names are returned, for example "Foo::Bar::", and are
left up to the caller on how to handle.
pod_inside()
Returns a list of POD sections.
contains_pod()
Returns true if there is any POD in the file.
pod($section)
Returns the POD data in the given section.
is_indexable($package) or is_indexable()
Available since version 1.000020.
Returns a boolean indicating whether the package (if provided) or any
package (otherwise) is eligible for indexing by PAUSE, the Perl Authors
Upload Server. Note This only checks for valid "package" declarations,
and does not take any ownership information into account.
SUPPORT
Bugs may be submitted through the RT bug tracker
<https://rt.cpan.org/Public/Dist/Display.html?Name=Module-Metadata> (or
bug-Module-Metadata@rt.cpan.org <mailto:bug-Module-
Metadata@rt.cpan.org>).
There is also a mailing list available for users of this distribution,
at <http://lists.perl.org/list/cpan-workers.html>.
There is also an irc channel available for users of this distribution,
at "#toolchain" on "irc.perl.org" <irc://irc.perl.org/#toolchain>.
AUTHOR
Original code from Module::Build::ModuleInfo by Ken Williams
<kwilliams@cpan.org>, Randy W. Sims <RandyS@ThePierianSpring.org>
Released as Module::Metadata by Matt S Trout (mst) <mst@shadowcat.co.uk>
with assistance from David Golden (xdg) <dagolden@cpan.org>.
CONTRIBUTORS
• Karen Etheridge <ether@cpan.org>
• David Golden <dagolden@cpan.org>
• Vincent Pit <perl@profvince.com>
• Matt S Trout <mst@shadowcat.co.uk>
• Chris Nehren <apeiron@cpan.org>
• Graham Knop <haarg@haarg.org>
• Olivier Mengué <dolmen@cpan.org>
• Tomas Doran <bobtfish@bobtfish.net>
• Christian Walde <walde.christian@googlemail.com>
• Craig A. Berry <cberry@cpan.org>
• Tatsuhiko Miyagawa <miyagawa@bulknews.net>
• tokuhirom <tokuhirom@gmail.com>
• Chris 'BinGOs' Williams <chris@bingosnet.co.uk>
• David Mitchell <davem@iabyn.com>
• David Steinbrunner <dsteinbrunner@pobox.com>
• Edward Zborowski <ed@rubensteintech.com>
• Gareth Harper <gareth@broadbean.com>
• James Raspass <jraspass@gmail.com>
• Jerry D. Hedden <jdhedden@cpan.org>
• Josh Jore <jjore@cpan.org>
• Kent Fredric <kentnl@cpan.org>
• Leon Timmermans <fawaka@gmail.com>
• Peter Rabbitson <ribasushi@cpan.org>
• Steve Hay <steve.m.hay@googlemail.com>
COPYRIGHT & LICENSE
Original code Copyright (c) 2001-2011 Ken Williams. Additional code
Copyright (c) 2010-2011 Matt Trout and David Golden. All rights
reserved.
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
perl v5.40.1 2026-08-30 Module::Metadata(3perl)
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