晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/opt/alt/ruby33/share/ruby/prism/
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Current File : //opt/alt/ruby33/share/ruby/prism/node_inspector.rb
# frozen_string_literal: true

module Prism
  # This object is responsible for generating the output for the inspect method
  # implementations of child nodes.
  class NodeInspector # :nodoc:
    attr_reader :prefix, :output

    def initialize(prefix = "")
      @prefix = prefix
      @output = +""
    end

    # Appends a line to the output with the current prefix.
    def <<(line)
      output << "#{prefix}#{line}"
    end

    # This generates a string that is used as the header of the inspect output
    # for any given node.
    def header(node)
      output = +"@ #{node.class.name.split("::").last} ("
      output << "location: (#{node.location.start_line},#{node.location.start_column})-(#{node.location.end_line},#{node.location.end_column})"
      output << ", newline: true" if node.newline?
      output << ")\n"
      output
    end

    # Generates a string that represents a list of nodes. It handles properly
    # using the box drawing characters to make the output look nice.
    def list(prefix, nodes)
      output = +"(length: #{nodes.length})\n"
      last_index = nodes.length - 1

      nodes.each_with_index do |node, index|
        pointer, preadd = (index == last_index) ? ["└── ", "    "] : ["├── ", "│   "]
        node_prefix = "#{prefix}#{preadd}"
        output << node.inspect(NodeInspector.new(node_prefix)).sub(node_prefix, "#{prefix}#{pointer}")
      end

      output
    end

    # Generates a string that represents a location field on a node.
    def location(value)
      if value
        "(#{value.start_line},#{value.start_column})-(#{value.end_line},#{value.end_column}) = #{value.slice.inspect}"
      else
        "∅"
      end
    end

    # Generates a string that represents a child node.
    def child_node(node, append)
      node.inspect(child_inspector(append)).delete_prefix(prefix)
    end

    # Returns a new inspector that can be used to inspect a child node.
    def child_inspector(append)
      NodeInspector.new("#{prefix}#{append}")
    end

    # Returns the output as a string.
    def to_str
      output
    end
  end
end