NAME¶
Data::YAML - Easy YAML serialisation of Perl data structures
VERSION¶
This document describes Data::YAML version 0.0.6
DESCRIPTION¶
In 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 syntax¶
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
--- ~
...
Uses¶
Use "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 LIMITATIONS¶
No bugs have been reported.
Please report any bugs or feature requests to "data-yaml@rt.cpan.org",
or through the web interface at <
http://rt.cpan.org>.
AUTHOR¶
Andy Armstrong "<andy@hexten.net>"
LICENCE AND COPYRIGHT¶
Copyright (c) 2007, Andy Armstrong "<andy@hexten.net>". 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.
DISCLAIMER OF WARRANTY¶
BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE
SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE
STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE
SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR
IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO
THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE
PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR
CORRECTION.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY
COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE
SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO
LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR
THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER
SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.