类 Binding

公共实例方法

irb(show_code: true) 点击切换源代码

打开一个 IRB 会话，其中调用 binding.irb，以便进行交互式调试。您可以调用当前作用域中可用的任何方法或变量，并且如果需要，可以修改状态。

给定一个名为 potato.rb 的 Ruby 文件，其中包含以下代码

class Potato
  def initialize
    @cooked = false
    binding.irb
    puts "Cooked potato: #{@cooked}"
  end
end

Potato.new

运行 ruby potato.rb 将打开一个 IRB 会话，其中调用 binding.irb，您将看到以下内容

$ ruby potato.rb

From: potato.rb @ line 4 :

    1: class Potato
    2:   def initialize
    3:     @cooked = false
 => 4:     binding.irb
    5:     puts "Cooked potato: #{@cooked}"
    6:   end
    7: end
    8:
    9: Potato.new

irb(#<Potato:0x00007feea1916670>):001:0>

您可以输入任何有效的 Ruby 代码，它将在当前上下文中进行评估。这允许您进行调试，而无需重复运行您的代码

irb(#<Potato:0x00007feea1916670>):001:0> @cooked
=> false
irb(#<Potato:0x00007feea1916670>):002:0> self.class
=> Potato
irb(#<Potato:0x00007feea1916670>):003:0> caller.first
=> ".../2.5.1/lib/ruby/2.5.0/irb/workspace.rb:85:in `eval'"
irb(#<Potato:0x00007feea1916670>):004:0> @cooked = true
=> true

您可以使用 exit 命令退出 IRB 会话。请注意，退出会恢复 binding.irb 暂停的执行，如本例中打印到标准输出的输出所示

irb(#<Potato:0x00007feea1916670>):005:0> exit
Cooked potato: true

有关更多信息，请参阅 IRB。

# File irb.rb, line 1563
def irb(show_code: true)
  # Setup IRB with the current file's path and no command line arguments
  IRB.setup(source_location[0], argv: []) unless IRB.initialized?
  # Create a new workspace using the current binding
  workspace = IRB::WorkSpace.new(self)
  # Print the code around the binding if show_code is true
  STDOUT.print(workspace.code_around_binding) if show_code
  # Get the original IRB instance
  debugger_irb = IRB.instance_variable_get(:@debugger_irb)

  irb_path = File.expand_path(source_location[0])

  if debugger_irb
    # If we're already in a debugger session, set the workspace and irb_path for the original IRB instance
    debugger_irb.context.replace_workspace(workspace)
    debugger_irb.context.irb_path = irb_path
    # If we've started a debugger session and hit another binding.irb, we don't want
    # to start an IRB session instead, we want to resume the irb:rdbg session.
    IRB::Debug.setup(debugger_irb)
    IRB::Debug.insert_debug_break
    debugger_irb.debug_break
  else
    # If we're not in a debugger session, create a new IRB instance with the current
    # workspace
    binding_irb = IRB::Irb.new(workspace, from_binding: true)
    binding_irb.context.irb_path = irb_path
    binding_irb.run(IRB.conf)
    binding_irb.debug_break
  end
end