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require 'debug_inspector'
module BindingOfCaller
module BindingExtensions
# Retrieve the binding of the nth caller of the current frame.
# @return [Binding]
def of_caller(n)
c = callers.drop(1)
if n > (c.size - 1)
raise "No such frame, gone beyond end of stack!"
else
c[n]
end
end
# Return bindings for all caller frames.
# @return [Array<Binding>]
def callers
ary = []
RubyVM::DebugInspector.open do |i|
n = 0
loop do
begin
b = i.frame_binding(n)
rescue ArgumentError
break
end
if b
b.instance_variable_set(:@iseq, i.frame_iseq(n))
ary << b
end
n += 1
end
end
ary.drop(1)
end
# Number of parent frames available at the point of call.
# @return [Fixnum]
def frame_count
callers.size - 1
end
# The type of the frame.
# @return [Symbol]
def frame_type
return nil if !@iseq
# apparently the 9th element of the iseq array holds the frame type
# ...not sure how reliable this is.
@frame_type ||= @iseq.to_a[9]
end
# The description of the frame.
# @return [String]
def frame_description
return nil if !@iseq
@frame_description ||= @iseq.label
end
end
end
class ::Binding
include BindingOfCaller::BindingExtensions
end
|
