Provided by: perl-doc_5.26.1-6ubuntu0.7_all 
NAME
Parse::CPAN::Meta - Parse META.yml and META.json CPAN metadata files
VERSION
version 2.150010
SYNOPSIS
#############################################
# In your file
---
name: My-Distribution
version: 1.23
resources:
homepage: "http://example.com/dist/My-Distribution"
#############################################
# In your program
use Parse::CPAN::Meta;
my $distmeta = Parse::CPAN::Meta->load_file('META.yml');
# Reading properties
my $name = $distmeta->{name};
my $version = $distmeta->{version};
my $homepage = $distmeta->{resources}{homepage};
DESCRIPTION
Parse::CPAN::Meta is a parser for META.json and META.yml files, using JSON::PP and/or
CPAN::Meta::YAML.
Parse::CPAN::Meta provides three methods: "load_file", "load_json_string", and
"load_yaml_string". These will read and deserialize CPAN metafiles, and are described
below in detail.
Parse::CPAN::Meta provides a legacy API of only two functions, based on the YAML functions
of the same name. Wherever possible, identical calling semantics are used. These may only
be used with YAML sources.
All error reporting is done with exceptions (die'ing).
Note that META files are expected to be in UTF-8 encoding, only. When converted string
data, it must first be decoded from UTF-8.
METHODS
load_file
my $metadata_structure = Parse::CPAN::Meta->load_file('META.json');
my $metadata_structure = Parse::CPAN::Meta->load_file('META.yml');
This method will read the named file and deserialize it to a data structure, determining
whether it should be JSON or YAML based on the filename. The file will be read using the
":utf8" IO layer.
load_yaml_string
my $metadata_structure = Parse::CPAN::Meta->load_yaml_string($yaml_string);
This method deserializes the given string of YAML and returns the first document in it.
(CPAN metadata files should always have only one document.) If the source was UTF-8
encoded, the string must be decoded before calling "load_yaml_string".
load_json_string
my $metadata_structure = Parse::CPAN::Meta->load_json_string($json_string);
This method deserializes the given string of JSON and the result. If the source was UTF-8
encoded, the string must be decoded before calling "load_json_string".
load_string
my $metadata_structure = Parse::CPAN::Meta->load_string($some_string);
If you don't know whether a string contains YAML or JSON data, this method will use some
heuristics and guess. If it can't tell, it assumes YAML.
yaml_backend
my $backend = Parse::CPAN::Meta->yaml_backend;
Returns the module name of the YAML serializer. See "ENVIRONMENT" for details.
json_backend
my $backend = Parse::CPAN::Meta->json_backend;
Returns the module name of the JSON serializer. If "CPAN_META_JSON_BACKEND" is set, this
will be whatever that's set to. If not, this will either be JSON::PP or JSON. If
"PERL_JSON_BACKEND" is set, this will return JSON as further delegation is handled by the
JSON module. See "ENVIRONMENT" for details.
json_decoder
my $decoder = Parse::CPAN::Meta->json_decoder;
Returns the module name of the JSON decoder. Unlike "json_backend", this is not
necessarily a full JSON-style module, but only something that will provide a "decode_json"
subroutine. If "CPAN_META_JSON_DECODER" is set, this will be whatever that's set to. If
not, this will be whatever has been selected as "json_backend". See "ENVIRONMENT" for
more notes.
FUNCTIONS
For maintenance clarity, no functions are exported by default. These functions are
available for backwards compatibility only and are best avoided in favor of "load_file".
Load
my @yaml = Parse::CPAN::Meta::Load( $string );
Parses a string containing a valid YAML stream into a list of Perl data structures.
LoadFile
my @yaml = Parse::CPAN::Meta::LoadFile( 'META.yml' );
Reads the YAML stream from a file instead of a string.
ENVIRONMENT
CPAN_META_JSON_DECODER
By default, JSON::PP will be used for deserializing JSON data. If the
"CPAN_META_JSON_DECODER" environment variable exists, this is expected to be the name of a
loadable module that provides a "decode_json" subroutine, which will then be used for
deserialization. Relying only on the existence of said subroutine allows for maximum
compatibility, since this API is provided by all of JSON::PP, JSON::XS, Cpanel::JSON::XS,
JSON::MaybeXS, JSON::Tiny, and Mojo::JSON.
CPAN_META_JSON_BACKEND
By default, JSON::PP will be used for deserializing JSON data. If the
"CPAN_META_JSON_BACKEND" environment variable exists, this is expected to be the name of a
loadable module that provides the JSON API, since downstream code expects to be able to
call "new" on this class. As such, while JSON::PP, JSON::XS, Cpanel::JSON::XS and
JSON::MaybeXS will work for this, to use Mojo::JSON or JSON::Tiny for decoding requires
setting "CPAN_META_JSON_DECODER".
PERL_JSON_BACKEND
If the "CPAN_META_JSON_BACKEND" environment variable does not exist, and if
"PERL_JSON_BACKEND" environment variable exists, is true and is not "JSON::PP", then the
JSON module (version 2.5 or greater) will be loaded and used to interpret
"PERL_JSON_BACKEND". If JSON is not installed or is too old, an exception will be thrown.
Note that at the time of writing, the only useful values are 1, which will tell JSON to
guess, or JSON::XS - if you want to use a newer JSON module, see "CPAN_META_JSON_BACKEND".
PERL_YAML_BACKEND
By default, CPAN::Meta::YAML will be used for deserializing YAML data. If the
"PERL_YAML_BACKEND" environment variable is defined, then it is interpreted as a module to
use for deserialization. The given module must be installed, must load correctly and must
implement the "Load()" function or an exception will be thrown.
AUTHORS
• David Golden <dagolden@cpan.org>
• Ricardo Signes <rjbs@cpan.org>
• Adam Kennedy <adamk@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2010 by David Golden, Ricardo Signes, Adam Kennedy and
Contributors.
This is free software; you can redistribute it and/or modify it under the same terms as
the Perl 5 programming language system itself.