Ruby中扩展File

原创于 2009-07-23 21:50:02 发布 · 133 阅读

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class File
  def self.write filename, content
    File.open(filename, 'wb') do |file|
      file.write content
    end
  end

  def self.append filename, content
    File.open(filename, 'ab') do |file|
      file.write content
    end
  end

  def self.expand_path_restricted(file_name, dir_string, restrict_dir_string = nil)
    dir_string = expand_path(dir_string)
    restrict_dir_string = restrict_dir_string ? expand_path(restrict_dir_string) : dir_string

    expanded = expand_path(file_name, dir_string)

    unless expanded.index(restrict_dir_string) == 0
      raise "Restricted file path #{file_name.inspect} must be inside #{restrict_dir_string.inspect}"
    end

    expanded
  end
end