Ruby Convert String to File

Is it possible to convert a string to a file without writing it to disk?

I would like to work ubiquitously with either a string of a file:

input = "123"
if (ARGV.length == 1)
   input = File.open(ARGV[0])

   #do stuff with input
end

Can I create a file from a string (without writing to disk)? Otherwise, I would not be able to do 开发者_运维问答input.readline() when it's a string.

You can use StringIO (1.8.7, 1.9.3) to create an IO (1.8.7, 1.9.3) object (that is, an object that acts like a file) out of a string:

file = StringIO.new("123")
line = file.readline
file.close

StringIO can be used to give a file-like interface to strings.

The StringIO is nice, you could also do this using a block:

StringIO.open(string) do |file|
  # do stuff here
end

I like this alt over file.close