```ruby
class GemsParser
  def self.parse(file)
    gp = GemsParser.new
    gp.parse(file)
    gp
  end

  def initialize
    @target_dir = nil
    @target_files = []
  end

  attr_reader :target_dir, :target_files

  def parse(file)
    self.instance_eval(file)
  end

  def dir(path)
    @target_dir = path
  end

  def download(name, ver)
    @target_files << [name, ver]
  end

  def windows?
    /mswin|mingw/ =~ RUBY_PLATFORM
  end

  def td_agent_2?
    (ENV['BUILD_TD_AGENT_VERSION'] || 3).to_i == 2
  end
end
```

Support td-agent 2.5 for gem parser
user
```ruby
class GemsParser
  def self.parse(file)
    gp = GemsParser.new
    gp.parse(file)
    gp
  end

  def initialize
    @target_dir = nil
    @target_files = []
  end

  attr_reader :target_dir, :target_files

  def parse(file)
    self.instance_eval(file)
  end

  def dir(path)
    @target_dir = path
  end

  def download(name, ver)
    @target_files << [name, ver]
  end

  def windows?
    /mswin|mingw/ =~ RUBY_PLATFORM
  end

  def td_agent_2?
    !td_agent_3?
  end

  def td_agent_3?
    (ENV['BUILD_TD_AGENT_VERSION'] || 3).to_s == '3'
  end
end
```
assistant