Module: Psych::Nodes

When using 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 dump, the Ruby object graph is translated to an intermediary AST which is then converted to a YAML document.

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 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 Stream at the root. A Stream node must have 1 or more Document nodes as children.

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

• Sequence

• Mapping

• Scalar

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

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

• Sequence

• Mapping

• Scalar

• Alias

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