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.\" ========================================================================
.\"
.IX Title "Parse::CPAN::Meta 3perl"
.TH Parse::CPAN::Meta 3perl "2011-09-19" "perl v5.14.2" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Parse::CPAN::Meta \- Parse META.yml and META.json CPAN metadata files
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&    #############################################
\&    # 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(\*(AqMETA.yml\*(Aq);
\&
\&    # Reading properties
\&    my $name     = $distmeta\->{name};
\&    my $version  = $distmeta\->{version};
\&    my $homepage = $distmeta\->{resources}{homepage};
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBParse::CPAN::Meta\fR is a parser for \fI\s-1META\s0.json\fR and \fI\s-1META\s0.yml\fR files, using
\&\s-1JSON::PP\s0 and/or CPAN::Meta::YAML.
.PP
\&\fBParse::CPAN::Meta\fR provides three methods: \f(CW\*(C`load_file\*(C'\fR, \f(CW\*(C`load_json_string\*(C'\fR,
and \f(CW\*(C`load_yaml_string\*(C'\fR.  These will read and deserialize \s-1CPAN\s0 metafiles, and
are described below in detail.
.PP
\&\fBParse::CPAN::Meta\fR provides a legacy \s-1API\s0 of only two functions,
based on the \s-1YAML\s0 functions of the same name. Wherever possible,
identical calling semantics are used.  These may only be used with \s-1YAML\s0 sources.
.PP
All error reporting is done with exceptions (die'ing).
.PP
Note that \s-1META\s0 files are expected to be in \s-1UTF\-8\s0 encoding, only.  When
converted string data, it must first be decoded from \s-1UTF\-8\s0.
.SH "METHODS"
.IX Header "METHODS"
.SS "load_file"
.IX Subsection "load_file"
.Vb 1
\&  my $metadata_structure = Parse::CPAN::Meta\->load_file(\*(AqMETA.json\*(Aq);
\&
\&  my $metadata_structure = Parse::CPAN::Meta\->load_file(\*(AqMETA.yml\*(Aq);
.Ve
.PP
This method will read the named file and deserialize it to a data structure,
determining whether it should be \s-1JSON\s0 or \s-1YAML\s0 based on the filename.  On
Perl 5.8.1 or later, the file will be read using the \*(L":utf8\*(R" \s-1IO\s0 layer.
.SS "load_yaml_string"
.IX Subsection "load_yaml_string"
.Vb 1
\&  my $metadata_structure = Parse::CPAN::Meta\->load_yaml_string($yaml_string);
.Ve
.PP
This method deserializes the given string of \s-1YAML\s0 and returns the first
document in it.  (\s-1CPAN\s0 metadata files should always have only one document.)
If the source was \s-1UTF\-8\s0 encoded, the string must be decoded before calling
\&\f(CW\*(C`load_yaml_string\*(C'\fR.
.SS "load_json_string"
.IX Subsection "load_json_string"
.Vb 1
\&  my $metadata_structure = Parse::CPAN::Meta\->load_json_string($json_string);
.Ve
.PP
This method deserializes the given string of \s-1JSON\s0 and the result.
If the source was \s-1UTF\-8\s0 encoded, the string must be decoded before calling
\&\f(CW\*(C`load_json_string\*(C'\fR.
.SS "yaml_backend"
.IX Subsection "yaml_backend"
.Vb 1
\&  my $backend = Parse::CPAN::Meta\->yaml_backend;
.Ve
.PP
Returns the module name of the \s-1YAML\s0 serializer. See \*(L"\s-1ENVIRONMENT\s0\*(R"
for details.
.SS "json_backend"
.IX Subsection "json_backend"
.Vb 1
\&  my $backend = Parse::CPAN::Meta\->json_backend;
.Ve
.PP
Returns the module name of the \s-1JSON\s0 serializer.  This will either
be \s-1JSON::PP\s0 or \s-1JSON\s0.  Even if \f(CW\*(C`PERL_JSON_BACKEND\*(C'\fR is set,
this will return \s-1JSON\s0 as further delegation is handled by
the \s-1JSON\s0 module.  See \*(L"\s-1ENVIRONMENT\s0\*(R" for details.
.SH "FUNCTIONS"
.IX Header "FUNCTIONS"
For maintenance clarity, no functions are exported.  These functions are
available for backwards compatibility only and are best avoided in favor of
\&\f(CW\*(C`load_file\*(C'\fR.
.SS "Load"
.IX Subsection "Load"
.Vb 1
\&  my @yaml = Parse::CPAN::Meta::Load( $string );
.Ve
.PP
Parses a string containing a valid \s-1YAML\s0 stream into a list of Perl data
structures.
.SS "LoadFile"
.IX Subsection "LoadFile"
.Vb 1
\&  my @yaml = Parse::CPAN::Meta::LoadFile( \*(AqMETA.yml\*(Aq );
.Ve
.PP
Reads the \s-1YAML\s0 stream from a file instead of a string.
.SH "ENVIRONMENT"
.IX Header "ENVIRONMENT"
.SS "\s-1PERL_JSON_BACKEND\s0"
.IX Subsection "PERL_JSON_BACKEND"
By default, \s-1JSON::PP\s0 will be used for deserializing \s-1JSON\s0 data. If the
\&\f(CW\*(C`PERL_JSON_BACKEND\*(C'\fR environment variable exists, is true and is not
\&\*(L"\s-1JSON::PP\s0\*(R", then the \s-1JSON\s0 module (version 2.5 or greater) will be loaded and
used to interpret \f(CW\*(C`PERL_JSON_BACKEND\*(C'\fR.  If \s-1JSON\s0 is not installed or is too
old, an exception will be thrown.
.SS "\s-1PERL_YAML_BACKEND\s0"
.IX Subsection "PERL_YAML_BACKEND"
By default, CPAN::Meta::YAML will be used for deserializing \s-1YAML\s0 data. If
the \f(CW\*(C`PERL_YAML_BACKEND\*(C'\fR 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 \f(CW\*(C`Load()\*(C'\fR function or an exception
will be thrown.
.SH "SUPPORT"
.IX Header "SUPPORT"
Bugs should be reported via the \s-1CPAN\s0 bug tracker at
.PP
http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Parse\-CPAN\-Meta <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Parse-CPAN-Meta>
.SH "AUTHOR"
.IX Header "AUTHOR"
Adam Kennedy <adamk@cpan.org>
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2006 \- 2010 Adam Kennedy.
.PP
This program is free software; you can redistribute
it and/or modify it under the same terms as Perl itself.
.PP
The full text of the license can be found in the
\&\s-1LICENSE\s0 file included with this module.