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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sh-3ll 1.0
DIR:/opt/alt/ruby34/share/ruby/error_highlight/
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Current File : //opt/alt/ruby34/share/ruby/error_highlight/formatter.rb
module ErrorHighlight
  class DefaultFormatter
    MIN_SNIPPET_WIDTH = 20

    def self.message_for(spot)
      # currently only a one-line code snippet is supported
      return "" unless spot[:first_lineno] == spot[:last_lineno]

      snippet      = spot[:snippet]
      first_column = spot[:first_column]
      last_column  = spot[:last_column]
      ellipsis     = "..."

      # truncate snippet to fit in the viewport
      if max_snippet_width && snippet.size > max_snippet_width
        available_width = max_snippet_width - ellipsis.size
        center          = first_column - max_snippet_width / 2

        visible_start  = last_column < available_width ? 0 : [center, 0].max
        visible_end    = visible_start + max_snippet_width
        visible_start  = snippet.size - max_snippet_width if visible_end > snippet.size

        prefix = visible_start.positive?    ? ellipsis : ""
        suffix = visible_end < snippet.size ? ellipsis : ""

        snippet = prefix + snippet[(visible_start + prefix.size)...(visible_end - suffix.size)] + suffix
        snippet << "\n" unless snippet.end_with?("\n")

        first_column -= visible_start
        last_column  = [last_column - visible_start, snippet.size - 1].min
      end

      indent = snippet[0...first_column].gsub(/[^\t]/, " ")
      marker = indent + "^" * (last_column - first_column)

      "\n\n#{ snippet }#{ marker }"
    end

    def self.max_snippet_width
      return if Ractor.current[:__error_highlight_max_snippet_width__] == :disabled

      Ractor.current[:__error_highlight_max_snippet_width__] ||= terminal_width
    end

    def self.max_snippet_width=(width)
      return Ractor.current[:__error_highlight_max_snippet_width__] = :disabled if width.nil?

      width = width.to_i

      if width < MIN_SNIPPET_WIDTH
        warn "'max_snippet_width' adjusted to minimum value of #{MIN_SNIPPET_WIDTH}."
        width = MIN_SNIPPET_WIDTH
      end

      Ractor.current[:__error_highlight_max_snippet_width__] = width
    end

    def self.terminal_width
      # lazy load io/console, so it's not loaded when 'max_snippet_width' is set
      require "io/console"
      STDERR.winsize[1] if STDERR.tty?
    rescue LoadError, NoMethodError, SystemCallError
      # do not truncate when window size is not available
    end
  end

  def self.formatter
    Ractor.current[:__error_highlight_formatter__] || DefaultFormatter
  end

  def self.formatter=(formatter)
    Ractor.current[:__error_highlight_formatter__] = formatter
  end
end