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Edit File : nodes.rb \| Size : 2.36 KB
# frozen_string_literal: false require 'psych/nodes/node' require 'psych/nodes/stream' require 'psych/nodes/document' require 'psych/nodes/sequence' require 'psych/nodes/scalar' require 'psych/nodes/mapping' require 'psych/nodes/alias' module Psych ### # = 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. module Nodes end end Back

Edit File : nodes.rb | Size : 2.36 KB

# frozen_string_literal: false
require 'psych/nodes/node'
require 'psych/nodes/stream'
require 'psych/nodes/document'
require 'psych/nodes/sequence'
require 'psych/nodes/scalar'
require 'psych/nodes/mapping'
require 'psych/nodes/alias'

module Psych
  ###
  # = 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.
  module Nodes
  end
end

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