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Filename : mini_stringio.rb

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# frozen_string_literal: true

module SyntaxSuggest
  # Mini String IO [Private]
  #
  # Acts like a StringIO with reduced API, but without having to require that
  # class.
  #
  # The original codebase emitted directly to $stderr, but now SyntaxError#detailed_message
  # needs a string output. To accomplish that we kept the original print infrastructure in place and
  # added this class to accumulate the print output into a string.
  class MiniStringIO
    EMPTY_ARG = Object.new

    def initialize(isatty: $stderr.isatty)
      @string = +""
      @isatty = isatty
    end

    attr_reader :isatty
    def puts(value = EMPTY_ARG, **)
      if !value.equal?(EMPTY_ARG)
        @string << value
      end
      @string << $/
    end

    attr_reader :string
  end
end