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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Current File : //opt/alt/ruby18/lib64/ruby/1.8/parsearg.rb
#
#		parsearg.rb - parse arguments
#			$Release Version: $
#			$Revision: 11708 $
#			$Date: 2007-02-13 08:01:19 +0900 (Tue, 13 Feb 2007) $
#			by Yasuo OHBA(SHL Japan Inc. Technology Dept.)
#
# --
#
#	
#

warn "Warning:#{caller[0].sub(/:in `.*'\z/, '')}: parsearg is deprecated after Ruby 1.8.1; use optparse instead"

$RCS_ID=%q$Header$

require "getopts"

def printUsageAndExit()
  if $USAGE
    eval($USAGE)
  end
  exit()
end

def setParenthesis(ex, opt, c)
  if opt != ""
    ex = sprintf("%s$OPT_%s%s", ex, opt, c)
  else
    ex = sprintf("%s%s", ex, c)
  end
  return ex
end

def setOrAnd(ex, opt, c)
  if opt != ""
    ex = sprintf("%s$OPT_%s %s%s ", ex, opt, c, c)
  else
    ex = sprintf("%s %s%s ", ex, c, c)
  end
  return ex
end

def setExpression(ex, opt, op)
  if !op
    ex = sprintf("%s$OPT_%s", ex, opt)
    return ex
  end
  case op.chr
  when "(", ")"
    ex = setParenthesis(ex, opt, op.chr)
  when "|", "&"
    ex = setOrAnd(ex, opt, op.chr)
  else
    return nil
  end
  return ex
end

# parseArgs is obsolete.  Use OptionParser instead.

def parseArgs(argc, nopt, single_opts, *opts)
  if (noOptions = getopts(single_opts, *opts)) == nil
    printUsageAndExit()
  end
  if nopt
    ex = nil
    pos = 0
    for o in nopt.split(/[()|&]/)
      pos += o.length
      ex = setExpression(ex, o, nopt[pos])
      pos += 1
    end
    begin
      if !eval(ex)
	printUsageAndExit()
      end
    rescue
      print "Format Error!! : \"" + nopt + "\"\t[parseArgs]\n"
      exit!(-1)
    end
  end
  if ARGV.length < argc
    printUsageAndExit()
  end
  return noOptions
end