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require 'psych/handler' module Psych ### # This class works in conjunction with Psych::Parser to build an in-memory # parse tree that represents a YAML document. # # == Example # # 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. class TreeBuilder < Psych::Handler # Returns the root node for the built tree attr_reader :root # Create a new TreeBuilder instance def initialize @stack = [] @last = nil @root = nil end %w{ Sequence Mapping }.each do |node| class_eval %{ def start_#{node.downcase}(anchor, tag, implicit, style) n = Nodes::#{node}.new(anchor, tag, implicit, style) @last.children << n push n end def end_#{node.downcase} pop end } end ### # Handles start_document events with +version+, +tag_directives+, # and +implicit+ styling. # # See Psych::Handler#start_document def start_document version, tag_directives, implicit n = Nodes::Document.new version, tag_directives, implicit @last.children << n push n end ### # Handles end_document events with +version+, +tag_directives+, # and +implicit+ styling. # # See Psych::Handler#start_document def end_document implicit_end = !streaming? @last.implicit_end = implicit_end pop end def start_stream encoding @root = Nodes::Stream.new(encoding) push @root end def end_stream pop end def scalar value, anchor, tag, plain, quoted, style s = Nodes::Scalar.new(value,anchor,tag,plain,quoted,style) @last.children << s s end def alias anchor @last.children << Nodes::Alias.new(anchor) end private def push value @stack.push value @last = value end def pop x = @stack.pop @last = @stack.last x end end end
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