```ruby
class Manifestation
  class Generate
    attr_accessor :source

    def initialize file
      @file   = file
      @source = parse @file
    end

    def compose
      contents.join "\n"
    end

    def build
      output_file = new_output_file
      output_file.write compose
      output_file.close
      output_file
    end

    private

    def base_path
      @base_path ||= File.expand_path "..", @file
    end

    def content_path
      @content_path ||= File.join base_path, source['base_path']
    end

    def content_files
      @content_files ||= Array @source['contents']
    end

    def contents
      @contents ||= content_files.map do |filename|
        file = File.join(content_path, filename)
        Parse.new(file).compose
      end
    end

    def output
      @output ||= output_file_path
    end

    def output_file_path
      File.join base_path, source['output']
    end

    def new_output_file
      File.new output, "w+"
    end

    def parse file = @file
      JSON.parse File.read file
    end

  end
end```

Rename parse to build_source, new parse method invokes Parse class
user
```ruby
class Manifestation
  class Generate
    attr_accessor :source

    def initialize file
      @file   = file
      @source = build_source @file
    end

    def compose
      contents.join "\n"
    end

    def build
      output_file = new_output_file
      output_file.write compose
      output_file.close
      output_file
    end

    private

    def base_path
      @base_path ||= File.expand_path "..", @file
    end

    def content_path
      @content_path ||= File.join base_path, source['base_path']
    end

    def content_files
      @content_files ||= Array @source['contents']
    end

    def contents
      @contents ||= content_files.map do |filename|
        parse File.join(content_path, filename)
      end
    end

    def output
      @output ||= output_file_path
    end

    def output_file_path
      File.join base_path, source['output']
    end

    def new_output_file
      File.new output, "w+"
    end

    def parse file
      Parse.new(file).compose
    end

    def build_source file = @file
      JSON.parse File.read file
    end

  end
end```
assistant