VERSIONThis document describes Data::YAML version 0.0.7
DESCRIPTIONIn the spirit of YAML::Tiny, Data::YAML::Reader and Data::YAML::Writer provide lightweight, dependency-free YAML handling. While "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.
The syntax accepted by "Data::YAML" is a subset of YAML. Specifically it is the same subset of YAML that Data::YAML::Writer produces. See Data::YAML for more information.
YAML syntaxAlthough 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
--- ~ ...
UsesUse "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 "Data::YAML" useful.
Read more about TAP and YAMLish here: <http://testanything.org/wiki>
BUGS AND LIMITATIONSNo bugs have been reported.
Please report any bugs or feature requests to "[email protected]", or through the web interface at <http://rt.cpan.org>.
AUTHORAndy Armstrong "<[email protected]>"
LICENCE AND COPYRIGHTCopyright (c) 2007, Andy Armstrong "<[email protected]>". 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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