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/opt/alt/ruby27/share/gems/gems/psych-3.1.0/lib/psych/handlers/

//opt/alt/ruby27/share/gems/gems/psych-3.1.0/lib/psych/handlers/document_stream.rb

 # frozen_string_literal: true
require 'psych/tree_builder'

module Psych
  module Handlers
    class DocumentStream < Psych::TreeBuilder # :nodoc:
      def initialize &block
        super
        @block = block
      end

      def start_document version, tag_directives, implicit
        n = Nodes::Document.new version, tag_directives, implicit
        push n
      end

      def end_document implicit_end = !streaming?
        @last.implicit_end = implicit_end
        @block.call pop
      end
    end
  end
end