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Parse::CPAN::Meta(3)                 User Contributed Perl Documentation                Parse::CPAN::Meta(3)



NAME
       Parse::CPAN::Meta - Parse META.yml and META.json CPAN metadata files

SYNOPSIS
           #############################################
           # In your file

           ---name: --name:
           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.



perl v5.16.2                                     2012-04-05                             Parse::CPAN::Meta(3)