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Class: IRB::Inspector

Relationships & Source Files
Inherits: Object
Defined in: lib/irb/inspector.rb

Overview

An irb inspector

In order to create your own custom inspector there are two things you should be aware of:

Inspector uses #inspect_value, or inspect_proc, for output of return values.

This also allows for an optional #init+, or init_proc, which is called when the inspector is activated.

Knowing this, you can create a rudimentary inspector as follows:

irb(main):001:0> ins = IRB::Inspector.new(proc{ |v| "omg! #{v}" })
irb(main):001:0> IRB.CurrentContext.inspect_mode = ins # => omg! #<IRB::Inspector:0x007f46f7ba7d28>
irb(main):001:0> "what?" #=> omg! what?

Constant Summary

Class Method Summary

Instance Method Summary

  • #init

    Proc to call when the inspector is activated, good for requiring dependent libraries.

  • #inspect_value(v)

    Proc to call when the input is evaluated and output in irb.

Constructor Details

.new(inspect_proc, init_proc = nil) ⇒ Inspector

Creates a new inspector object, using the given inspect_proc when output return values in irb.

[ GitHub ] 

  


# File 'lib/irb/inspector.rb', line 83



def initialize(inspect_proc, init_proc = nil)
  @init = init_proc
  @inspect = inspect_proc
end


  







Class Method Details



  

    .def_inspector(key, arg = nil, &block)  
  



  

    

Example



Inspector.def_inspector(key, init_p=nil){|v| v.inspect}
Inspector.def_inspector([key1,..], init_p=nil){|v| v.inspect}
Inspector.def_inspector(key, inspector)
Inspector.def_inspector([key1,...], inspector)


  



  [ GitHub ]


  

  


# File 'lib/irb/inspector.rb', line 58



def self.def_inspector(key, arg=nil, &block)
  if block_given?
    inspector = IRB::Inspector(block, arg)
  else
    inspector = arg
  end

  case key
  when Array
    for k in key
      def_inspector(k, inspector)
    end
  when Symbol
    INSPECTORS[key] = inspector
    INSPECTORS[key.to_s] = inspector
  when String
    INSPECTORS[key] = inspector
    INSPECTORS[key.intern] = inspector
  else
    INSPECTORS[key] = inspector
  end
end


  








  

    .keys_with_inspector(inspector)  
  



  

    

Determines the inspector to use where inspector is one of the keys passed during inspector definition.


  



  [ GitHub ]


  

  


# File 'lib/irb/inspector.rb', line 48



def self.keys_with_inspector(inspector)
  INSPECTORS.select{|k, v| v == inspector}.collect{|k, v| k}
end


  







Instance Method Details



  

    #init  
  



  

    

Proc to call when the inspector is activated, good for requiring dependent libraries.


  



  [ GitHub ]


  

  


# File 'lib/irb/inspector.rb', line 90



def init
  @init.call if @init
end


  








  

    #inspect_value(v)  
  



  

    

Proc to call when the input is evaluated and output in irb.


  



  [ GitHub ]


  

  


# File 'lib/irb/inspector.rb', line 95



def inspect_value(v)
  @inspect.call(v)
rescue => e
  puts "An error occurred when inspecting the object: #{e.inspect}"

  begin
    puts "Result of Kernel#inspect: #{KERNEL_INSPECT.bind_call(v)}"
    ''
  rescue => e
    puts "An error occurred when running Kernel#inspect: #{e.inspect}"
    puts e.backtrace.join("\n")
    ''
  end
end