YAML::Syck(3)

NAME
YAML::Syck - Fast, lightweight YAML loader and dumper

VERSION
This document describes version 1.04 of YAML::Syck, released February 17, 2008.

SYNOPSIS
    use YAML::Syck;

    # Set this for interoperability with other YAML/Syck bindings:
    # e.g. Load('Yes') becomes 1 and Load('No') becomes ''.
    $YAML::Syck::ImplicitTyping = 1;

    $data = Load($yaml);
    $yaml = Dump($data);

    # $file can be an IO object, or a filename
    $data = LoadFile($file);
    DumpFile($file, $data);

    # A string with multiple YAML streams in it
    $yaml = Dump(@data);
    @data = Load($yaml);

DESCRIPTION
This module provides a Perl interface to the libsyck data serialization library. It exports the "Dump" and "Load" functions for converting Perl data structures to YAML strings, and the other way around.

NOTE: If you are working with other language's YAML/Syck bindings (such as Ruby), please set $YAML::Syck::ImplicitTyping to 1 before calling the "Load"/"Dump" functions. The default setting is for preserving backward-compatibility with "YAML.pm".

FLAGS

  $YAML::Syck::Headless
Defaults to false. Setting this to a true value will make "Dump" omit the leading "---\n" marker.

  $YAML::Syck::SortKeys
Defaults to false. Setting this to a true value will make "Dump" sort hash keys.

  $YAML::Syck::SingleQuote
Defaults to false. Setting this to a true value will make "Dump" always emit single quotes instead of bare strings.

  $YAML::Syck::ImplicitTyping
Defaults to false. Setting this to a true value will make "Load" recognize various implicit types in YAML, such as unquoted "true", "false", as well as integers and floating-point numbers. Otherwise, only "~" is recognized to be "undef".

  $YAML::Syck::ImplicitUnicode
Defaults to false. For Perl 5.8.0 or later, setting this to a true value will make "Load" set Unicode flag on for every string that contains valid UTF8 sequences, and make "Dump" return a unicode string.

Regardless of this flag, Unicode strings are dumped verbatim without escaping; byte strings with high-bit set will be dumped with backslash escaping.

However, because YAML does not distinguish between these two kinds of strings, so this flag will affect loading of both variants of strings.

  $YAML::Syck::ImplicitBinary
Defaults to false. For Perl 5.8.0 or later, setting this to a true value will make "Dump" generate Base64-encoded "!!binary" data for all non-Unicode scalars containing high-bit bytes.

  $YAML::Syck::UseCode / $YAML::Syck::LoadCode / $YAML::Syck::DumpCode
These flags control whether or not to try and eval/deparse perl source code; each of them defaults to false.

Setting $YAML::Syck::UseCode to a true value is equivalent to setting both $YAML::Syck::LoadCode and $YAML::Syck::DumpCode to true.

BUGS
Dumping Glob/IO values does not work yet.

CAVEATS
This module implements the YAML 1.0 spec. To deal with data in YAML 1.1, please use the "YAML::XS" module instead.

The current implementation bundles libsyck source code; if your system has a site-wide shared libsyck, it will not be used.

Tag names such as "!!perl/hash:Foo" is blessed into the package "Foo", but the "!hs/foo" and "!!hs/Foo" tags are blessed into "hs::Foo". Note that this holds true even if the tag contains non-word characters; for example, "!haskell.org/Foo" is blessed into "haskell.org::Foo". Please use Class::Rebless to cast it into other user-defined packages.

SEE ALSO
YAML, JSON::Syck

<http://www.yaml.org/>

AUTHORS
Audrey Tang <cpan@audreyt.org>

COPYRIGHT
Copyright 2005, 2006, 2007, 2008 by Audrey Tang <cpan@audreyt.org>.

This software is released under the MIT license cited below.

The libsyck code bundled with this library is released by "why the lucky stiff", under a BSD-style license. See the COPYING file for details.

  The "MIT" License
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.