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module MethodSource
module SourceLocation
module MethodExtensions
def trace_func(event, file, line, id, binding, classname)
return unless event == 'call'
set_trace_func nil
@file, @line = file, line
raise :found
end
private :trace_func
# Return the source location of a method for Ruby 1.8.
# @return [Array] A two element array. First element is the
# file, second element is the line in the file where the
# method definition is found.
def source_location
if @file.nil?
args =[*(1..(arity<-1 ? -arity-1 : arity ))]
set_trace_func method(:trace_func).to_proc
call *args rescue nil
set_trace_func nil
@file = File.expand_path(@file) if @file && File.exist?(File.expand_path(@file))
end
return [@file, @line] if File.exist?(@file.to_s)
end
end
module UnboundMethodExtensions
# Return the source location of an instance method for Ruby 1.8.
# @return [Array] A two element array. First element is the
# file, second element is the line in the file where the
# method definition is found.
def source_location
klass = case owner
when Class
owner
when Module
method_owner = owner
Class.new { include(method_owner) }
end
begin
klass.allocate.method(name).source_location
rescue TypeError
# Assume we are dealing with a Singleton Class:
# 1. Get the instance object
# 2. Forward the source_location lookup to the instance
instance ||= ObjectSpace.each_object(owner).first
instance.method(name).source_location
end
end
end
end
end
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