diff options
Diffstat (limited to 'activesupport/lib/active_support/binding_of_caller.rb')
-rw-r--r-- | activesupport/lib/active_support/binding_of_caller.rb | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/activesupport/lib/active_support/binding_of_caller.rb b/activesupport/lib/active_support/binding_of_caller.rb deleted file mode 100644 index e224c996da..0000000000 --- a/activesupport/lib/active_support/binding_of_caller.rb +++ /dev/null @@ -1,84 +0,0 @@ -begin
- require 'simplecc'
-rescue LoadError
- class Continuation # :nodoc: # for RDoc
- end
- def Continuation.create(*args, &block) # :nodoc:
- cc = nil; result = callcc {|c| cc = c; block.call(cc) if block and args.empty?}
- result ||= args
- return *[cc, *result]
- end
-end
-
-class Binding; end # for RDoc
-# This method returns the binding of the method that called your
-# method. It will raise an Exception when you're not inside a method.
-#
-# It's used like this:
-# def inc_counter(amount = 1)
-# Binding.of_caller do |binding|
-# # Create a lambda that will increase the variable 'counter'
-# # in the caller of this method when called.
-# inc = eval("lambda { |arg| counter += arg }", binding)
-# # We can refer to amount from inside this block safely.
-# inc.call(amount)
-# end
-# # No other statements can go here. Put them inside the block.
-# end
-# counter = 0
-# 2.times { inc_counter }
-# counter # => 2
-#
-# Binding.of_caller must be the last statement in the method.
-# This means that you will have to put everything you want to
-# do after the call to Binding.of_caller into the block of it.
-# This should be no problem however, because Ruby has closures.
-# If you don't do this an Exception will be raised. Because of
-# the way that Binding.of_caller is implemented it has to be
-# done this way.
-def Binding.of_caller(&block)
- old_critical = Thread.critical
- Thread.critical = true
- count = 0
- cc, result, error, extra_data = Continuation.create(nil, nil)
- error.call if error
-
- tracer = lambda do |*args|
- type, context, extra_data = args[0], args[4], args
- if type == "return"
- count += 1
- # First this method and then calling one will return --
- # the trace event of the second event gets the context
- # of the method which called the method that called this
- # method.
- if count == 2
- # It would be nice if we could restore the trace_func
- # that was set before we swapped in our own one, but
- # this is impossible without overloading set_trace_func
- # in current Ruby.
- set_trace_func(nil)
- cc.call(eval("binding", context), nil, extra_data)
- end
- elsif type == "line" then
- nil
- elsif type == "c-return" and extra_data[3] == :set_trace_func then
- nil
- else
- set_trace_func(nil)
- error_msg = "Binding.of_caller used in non-method context or " +
- "trailing statements of method using it aren't in the block."
- cc.call(nil, lambda { raise(ArgumentError, error_msg) }, nil)
- end
- end
-
- unless result
- set_trace_func(tracer)
- return nil
- else
- Thread.critical = old_critical
- case block.arity
- when 1 then yield(result)
- else yield(result, extra_data)
- end
- end
-end
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