Base server class

exception to wait for reading. see IO.select.

exception to wait for writing. see IO.select.

Overview

When using Psych.load to deserialize a YAML document, the document is translated to an intermediary AST. That intermediary AST is then translated in to a Ruby object graph.

In the opposite direction, when using Psych.dump, the Ruby object graph is translated to an intermediary AST which is then converted to a YAML document.

Psych::Nodes contains all of the classes that make up the nodes of a YAML AST. You can manually build an AST and use one of the visitors (see Psych::Visitors) to convert that AST to either a YAML document or to a Ruby object graph.

Here is an example of building an AST that represents a list with one scalar:

# Create our nodes
stream = Psych::Nodes::Stream.new
doc    = Psych::Nodes::Document.new
seq    = Psych::Nodes::Sequence.new
scalar = Psych::Nodes::Scalar.new('foo')

# Build up our tree
stream.children << doc
doc.children    << seq
seq.children    << scalar

The stream is the root of the tree. We can then convert the tree to YAML:

stream.to_yaml => "---\n- foo\n"

Or convert it to Ruby:

stream.to_ruby => [["foo"]]

YAML AST Requirements

A valid YAML AST must have one Psych::Nodes::Stream at the root. A Psych::Nodes::Stream node must have 1 or more Psych::Nodes::Document nodes as children.

Psych::Nodes::Document nodes must have one and only one child. That child may be one of:

• Psych::Nodes::Sequence

• Psych::Nodes::Mapping

• Psych::Nodes::Scalar

Psych::Nodes::Sequence and Psych::Nodes::Mapping nodes may have many children, but Psych::Nodes::Mapping nodes should have an even number of children.

All of these are valid children for Psych::Nodes::Sequence and Psych::Nodes::Mapping nodes:

• Psych::Nodes::Sequence

• Psych::Nodes::Mapping

• Psych::Nodes::Scalar

• Psych::Nodes::Alias

Psych::Nodes::Scalar and Psych::Nodes::Alias are both terminal nodes and should not have any children.

The GC profiler provides access to information on GC runs including time, length and object space size.

Example:

GC::Profiler.enable

require 'rdoc/rdoc'

GC::Profiler.report

GC::Profiler.disable

See also GC.count, GC.malloc_allocated_size and GC.malloc_allocations

The Observable module extended to DRb. See Observable for details.

Utility module to define eRuby script as instance method.

Example

example.rhtml:

<% for item in @items %>
<b><%= item %></b>
<% end %>

example.rb:

require 'erb'
class MyClass
  extend ERB::DefMethod
  def_erb_method('render()', 'example.rhtml')
  def initialize(items)
    @items = items
  end
end
print MyClass.new([10,20,30]).render()

result:

<b>10</b>

<b>20</b>

<b>30</b>

Extends command line arguments array (ARGV) to parse itself.

Acceptable argument classes. Now contains DecimalInteger, OctalInteger and DecimalNumeric. See Acceptable argument classes (in source code).

Represents a node in the tree. Nodes are never encountered except as superclasses of other objects. Nodes have siblings.

Represents the primitive object id for OpenSSL::ASN1

Error raised upon an unknown response from the server.

IO wrapper that creates digests of contents written to the IO it wraps.

Used internally to indicate that a dependency conflicted with a spec that would be activated.