Psych is a YAML parser and emitter. Psych leverages libyaml for its YAML parsing and emitting capabilities. In addition to wrapping libyaml, Psych also knows how to serialize and de-serialize most Ruby objects to and from the YAML format.
# Safely load YAML in to a Ruby object
Psych.safe_load('--- foo') # => 'foo'
# Emit YAML from a Ruby object
Psych.dump("foo") # => "--- foo\n...\n"- libyaml
Psych has been included with MRI since 1.9.2, and is the default YAML parser in 1.9.3.
If you want a newer gem release of Psych, you can use rubygems:
gem install psych
Psych supported the static build with specific version of libyaml sources. You can build psych with libyaml-0.2.5 like this.
gem install psych -- --with-libyaml-source-dir=/path/to/libyaml-0.2.5
In order to use the gem release in your app, and not the stdlib version, you'll need the following:
gem 'psych'
require 'psych'
Or if you use Bundler add this to your Gemfile:
gem 'psych'
JRuby ships with a pure Java implementation of Psych.
Copyright 2009 Aaron Patterson, et al.
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.
