You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: trim_box.rb
    path of file: ./repos/fastlane/frameit/lib/frameit
    
    the code of the file until where you have to start completion: require_relative 'module'

module Frameit
  # Represents the MiniMagick trim bounding box for cropping a text image
  class Trimbox
    attr_accessor :width # width of the trim box
    attr_accessor :height # height of the trim box
    attr_accessor :offset_x # horizontal offset from the canvas to the trim box
    attr_accessor :offset_y # vertical offset from the canvas to the trim box

    # identify_string: A string with syntax "<width>x<height>+<offset_x>+<offset_y>". This is returned by MiniMagick when using function .identify with format("%@"). It is also required for the MiniMagick .crop function.
    def initialize(identify_string)
      UI.user_error!("Trimbox cannot be initialised with an empty '
    
    def initialize(identify_string)
      UI.user_error!("Trimbox cannot be initialised with an empty 'identify_string'.") unless identify_string.length > 0

      # Parse the input syntax "<width>x<height>+<offset_x>+<offset_y>".
      # Extract these 4 parameters into an integer array, by using multiple string separators: "x" and "+":
      trim_values = identify_string.split(/[x+]/).map(&:to_i)

      # If 'identify_string' doesn't have the expected syntax with 4 parameters, show error:
      UI.user_error!("Trimbox is initialised with an invalid value for 'identify_string'.") unless trim_values.length == 4

      # Assign instance variables:
      @width = trim_values[0]
      @height = trim_values[1]
      @offset_x = trim_values[2]
      @offset_y = trim_values[3]
    end

    # Get the trimbox parameters in the MiniMagick string format
    def string_format
      # Convert trim box parameters to string with syntax: "<width>x<height>+<offset_x>+<offset_y>":
      return "#{@width}x#{@height}+#{@offset_x}+#{@offset_y}"
    end

    # Get the trimbox parameters in a human readable JSON string format
    def json_string_format
      # Create a JSON string from the trim box parameters:
      return "{\"width\" : #{@width}, \"height\" : #{@height} , \"offset_x\" : #{@offset_x}, \"offset_y\" : #{@offset_y}}"
    end
  end