Data::YAML - Easy YAML serialisation of Perl data structures
This document describes Data::YAML version 0.0.6
In the spirit of YAML::Tiny,
Data::YAML::Reader and Data::YAML::Writer provide lightweight,
dependency-free YAML handling.
YAML::Tiny is designed principally for working with configuration files
Data::YAML concentrates on the transparent round- tripping of YAML serialized Perl data structures.
As an example of why this distinction matters consider that
YAML::Tiny doesn't handle hashes with keys containing non-printable characters.
This is fine for configuration files but likely to cause problems when handling arbitrary Perl data structures.
Data::YAML handles exotic hash keys correctly.
Although YAML appears to be a simple language the entire YAML specification is huge.
Data::YAML implements a small subset of the complete syntax trading completeness for compactness and simplicity.
This restricted syntax is known (to me at least) as 'YAMLish'.
These examples demonstrates the full range of supported syntax.
All YAML documents must begin with '---' and end with a line containing '...'.
--- Simple scalar ...
Unprintable characters are represented using standard escapes in double quoted strings.
--- "\t\x01\x02\n" ...
Array and hashes are represented thusly
--- - "This" - "is" - "an" - "array" ... --- This: is a: hash ...
Structures may nest arbitrarily
--- - name: 'Hash one' value: 1 - name: 'Hash two' value: 2 ...
Undef is a tilde
--- ~ ...
Data::YAML may be used any time you need to freeze and thaw Perl data structures into a human readable format. The output from
Data::YAML::Writer should be readable by any YAML parser.
Data::YAML was originally written to allow machine-readable diagnostic information to be passed from test scripts to TAP::Harness. That means that if you're writing a testing system that needs to output TAP version 13 or later syntax you might find
Read more about TAP and YAMLish here: http://testanything.org/wiki
No bugs have been reported.
Please report any bugs or feature requests to
firstname.lastname@example.org, or through the web interface at http://rt.cpan.org.
Copyright (c) 2007, Andy Armstrong
<email@example.com>. All rights reserved.
This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.
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