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| Current File : //usr/share/ruby/irb/inspector.rb |
#
# irb/inspector.rb - inspect methods
# $Release Version: 0.9.6$
# $Revision: 1.19 $
# $Date: 2002/06/11 07:51:31 $
# by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
# --
#
#
#
module IRB # :nodoc:
# Convenience method to create a new Inspector, using the given +inspect+
# proc, and optional +init+ proc and passes them to Inspector.new
#
# irb(main):001:0> ins = IRB::Inspector(proc{ |v| "omg! #{v}" })
# irb(main):001:0> IRB.CurrentContext.inspect_mode = ins # => omg! #<IRB::Inspector:0x007f46f7ba7d28>
# irb(main):001:0> "what?" #=> omg! what?
#
def IRB::Inspector(inspect, init = nil)
Inspector.new(inspect, init)
end
# 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?
#
class Inspector
# Default inspectors available to irb, this includes:
#
# +:pp+:: Using Kernel#pretty_inspect
# +:yaml+:: Using YAML.dump
# +:marshal+:: Using Marshal.dump
INSPECTORS = {}
# Determines the inspector to use where +inspector+ is one of the keys passed
# during inspector definition.
def self.keys_with_inspector(inspector)
INSPECTORS.select{|k,v| v == inspector}.collect{|k, v| k}
end
# 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)
def self.def_inspector(key, arg=nil, &block)
# if !block_given?
# case arg
# when nil, Proc
# inspector = IRB::Inspector(init_p)
# when Inspector
# inspector = init_p
# else
# IRB.Raise IllegalParameter, init_p
# end
# init_p = nil
# else
# inspector = IRB::Inspector(block, init_p)
# end
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
# Creates a new inspector object, using the given +inspect_proc+ when
# output return values in irb.
def initialize(inspect_proc, init_proc = nil)
@init = init_proc
@inspect = inspect_proc
end
# Proc to call when the inspector is activated, good for requiring
# dependant libraries.
def init
@init.call if @init
end
# Proc to call when the input is evaluated and output in irb.
def inspect_value(v)
@inspect.call(v)
end
end
Inspector.def_inspector([false, :to_s, :raw]){|v| v.to_s}
Inspector.def_inspector([true, :p, :inspect]){|v|
begin
v.inspect
rescue NoMethodError
puts "(Object doesn't support #inspect)"
end
}
Inspector.def_inspector([:pp, :pretty_inspect], proc{require "pp"}){|v| v.pretty_inspect.chomp}
Inspector.def_inspector([:yaml, :YAML], proc{require "yaml"}){|v|
begin
YAML.dump(v)
rescue
puts "(can't dump yaml. use inspect)"
v.inspect
end
}
Inspector.def_inspector([:marshal, :Marshal, :MARSHAL, Marshal]){|v|
Marshal.dump(v)
}
end