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# frozen_string_literal: true
require 'stringio'
require 'psych/class_loader'
require 'psych/scalar_scanner'
module Psych
module Nodes
###
# The base class for any Node in a YAML parse tree. This class should
# never be instantiated.
class Node
include Enumerable
# The children of this node
attr_reader :children
# An associated tag
attr_reader :tag
# The line number where this node start
attr_accessor :start_line
# The column number where this node start
attr_accessor :start_column
# The line number where this node ends
attr_accessor :end_line
# The column number where this node ends
attr_accessor :end_column
# Create a new Psych::Nodes::Node
def initialize
@children = []
end
###
# Iterate over each node in the tree. Yields each node to +block+ depth
# first.
def each &block
return enum_for :each unless block_given?
Visitors::DepthFirst.new(block).accept self
end
###
# Convert this node to Ruby.
#
# See also Psych::Visitors::ToRuby
def to_ruby
Visitors::ToRuby.create.accept(self)
end
alias :transform :to_ruby
###
# Convert this node to YAML.
#
# See also Psych::Visitors::Emitter
def yaml io = nil, options = {}
real_io = io || StringIO.new(''.encode('utf-8'))
Visitors::Emitter.new(real_io, options).accept self
return real_io.string unless io
io
end
alias :to_yaml :yaml
def alias?; false; end
def document?; false; end
def mapping?; false; end
def scalar?; false; end
def sequence?; false; end
def stream?; false; end
end
end
end
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