NAME¶
Parse::CPAN::Meta - Parse META.yml and META.json CPAN metadata files
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. On Perl
5.8.1 or later, 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".
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. This will either be JSON::PP or
JSON. Even if "PERL_JSON_BACKEND" is set, this will return JSON as
further delegation is handled by the JSON module. See "ENVIRONMENT"
for details.
FUNCTIONS¶
For maintenance clarity, no functions are exported. 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¶
PERL_JSON_BACKEND¶
By default, JSON::PP will be used for deserializing JSON data. If the
"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.
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
intepreted 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.
SUPPORT¶
Bugs should be reported via the CPAN bug tracker at
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Parse-CPAN-Meta
<
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Parse-CPAN-Meta>
AUTHOR¶
Adam Kennedy <adamk@cpan.org>
COPYRIGHT¶
Copyright 2006 - 2010 Adam Kennedy.
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
The full text of the license can be found in the LICENSE file included with this
module.