/usr/lib/ruby/2.0.0/yaml.rb is in libruby2.0 2.0.0.484-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# The YAML module is an alias of Psych, the YAML engine for ruby.
begin
require 'psych'
rescue LoadError
warn "#{caller[0]}:"
warn "It seems your ruby installation is missing psych (for YAML output)."
warn "To eliminate this warning, please install libyaml and reinstall your ruby."
raise
end
YAML = Psych
module Psych # :nodoc:
# For compatibility, deprecated
class EngineManager # :nodoc:
attr_reader :yamler # :nodoc:
def initialize # :nodoc:
@yamler = 'psych'
end
def syck? # :nodoc:
false
end
# Psych is always used and this method has no effect.
#
# This method is still present for compatibility.
#
# You may still use the Syck engine by installing
# the 'syck' gem and using the Syck constant.
def yamler= engine # :nodoc:
case engine
when 'syck' then warn "syck has been removed, psych is used instead"
when 'psych' then @yamler = 'psych'
else
raise(ArgumentError, "bad engine")
end
engine
end
end
ENGINE = EngineManager.new # :nodoc:
end
# YAML Ain't Markup Language
#
# This module provides a Ruby interface for data serialization in YAML format.
#
# The underlying implementation is the libyaml wrapper Psych.
#
# == Usage
#
# Working with YAML can be very simple, for example:
#
# require 'yaml' # STEP ONE, REQUIRE YAML!
# # Parse a YAML string
# YAML.load("--- foo") #=> "foo"
#
# # Emit some YAML
# YAML.dump("foo") # => "--- foo\n...\n"
# { :a => 'b'}.to_yaml # => "---\n:a: b\n"
#
# == Security
#
# Do not use YAML to load untrusted data. Doing so is unsafe and could allow
# malicious input to execute arbitrary code inside your application. Please see
# doc/security.rdoc for more information.
#
# == History
#
# Syck was the original for YAML implementation in Ruby's standard library
# developed by why the lucky stiff.
#
# You can still use Syck, if you prefer, for parsing and emitting YAML, but you
# must install the 'syck' gem now in order to use it.
#
# In older Ruby versions, ie. <= 1.9, Syck is still provided, however it was
# completely removed with the release of Ruby 2.0.0.
#
# == More info
#
# For more advanced details on the implementation see Psych, and also check out
# http://yaml.org for spec details and other helpful information.
module YAML
end
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