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Edit File : tree_builder.rb \| Size : 2.05 KB
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 Back

Edit File : tree_builder.rb | Size : 2.05 KB

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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