An error that indicates we weren’t able to fetch some data from a source

Signals that a remote operation cannot be conducted, probably due to not being connected (or just not finding host).

The installer installs the files contained in the .gem into the Gem.home.

Gem::Installer does the work of putting files in all the right places on the filesystem including unpacking the gem into its gem dir, installing the gemspec in the specifications dir, storing the cached gem in the cache dir, and installing either wrappers or symlinks for executables.

The installer invokes pre and post install hooks. Hooks can be added either through a rubygems_plugin.rb file in an installed gem or via a rubygems/defaults/#{RUBY_ENGINE}.rb or rubygems/defaults/operating_system.rb file. See Gem.pre_install and Gem.post_install for details.

A test case for Gem::Installer.

This Gem::StreamUI subclass records input and output to StringIO for retrieval during tests.

RemoteFetcher handles the details of fetching gems and gem information from a remote source.

SilentUI is a UI choice that is absolutely silent.

Not a URI.

URI is valid, bad usage is not.

Base server class

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>