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Showing content from https://docs.ruby-lang.org/en/3.4/Psych/TreeBuilder.html below:

class Psych::TreeBuilder - Documentation for Ruby 3.4

1. Psych::
2. TreeBuilder

This class works in conjunction with Psych::Parser to build an in-memory parse tree that represents a YAML document.

parser = Psych::Parser.new Psych::TreeBuilder.new
parser.parse('--- foo')
tree = parser.handler.root

See Psych::Handler for documentation on the event methods used in this class.

Returns the root node for the built tree

def initialize
  @stack = []
  @last  = nil
  @root  = nil

  @start_line   = nil
  @start_column = nil
  @end_line     = nil
  @end_column   = nil
end

Create a new TreeBuilder instance

def alias anchor
  a = Nodes::Alias.new(anchor)
  set_location(a)
  @last.children << a
  a
end

def end_document implicit_end = !streaming?
  @last.implicit_end = implicit_end
  n = pop
  set_end_location(n)
  n
end

Handles end_document events with version, tag_directives, and implicit styling.

See Psych::Handler#start_document

def end_stream
  n = pop
  set_end_location(n)
  n
end

def event_location(start_line, start_column, end_line, end_column)
  @start_line   = start_line
  @start_column = start_column
  @end_line     = end_line
  @end_column   = end_column
end

def scalar value, anchor, tag, plain, quoted, style
  s = Nodes::Scalar.new(value,anchor,tag,plain,quoted,style)
  set_location(s)
  @last.children << s
  s
end

def start_document version, tag_directives, implicit
  n = Nodes::Document.new version, tag_directives, implicit
  set_start_location(n)
  @last.children << n
  push n
end

Handles start_document events with version, tag_directives, and implicit styling.

See Psych::Handler#start_document

def start_stream encoding
  @root = Nodes::Stream.new(encoding)
  set_start_location(@root)
  push @root
end

def pop
  x = @stack.pop
  @last = @stack.last
  x
end

def push value
  @stack.push value
  @last = value
end

def set_end_location(node)
  node.end_line   = @end_line
  node.end_column = @end_column
end

def set_location(node)
  set_start_location(node)
  set_end_location(node)
end

def set_start_location(node)
  node.start_line   = @start_line
  node.start_column = @start_column
end

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