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module RSpec
module Matchers
module Extensions
module InstanceEvalWithArgs
# based on Bounded Spec InstanceExec (Mauricio Fernandez)
# http://eigenclass.org/hiki/bounded+space+instance_exec
# - uses singleton_class instead of global InstanceExecHelper module
# - this keeps it scoped to classes/modules that include this module
# - only necessary for ruby 1.8.6
def instance_eval_with_args(*args, &block)
return instance_exec(*args, &block) if respond_to?(:instance_exec)
# If there are no args and the block doesn't expect any, there's no
# need to fake instance_exec with our hack below.
# Notes:
# * lambda { }.arity # => -1
# * lambda { || }.arity # => 0
# * lambda { |*a| }.arity # -1
return instance_eval(&block) if block.arity < 1 && args.empty?
singleton_class = (class << self; self; end)
begin
orig_critical, Thread.critical = Thread.critical, true
n = 0
n += 1 while respond_to?(method_name="__instance_exec#{n}")
singleton_class.module_eval{ define_method(method_name, &block) }
ensure
Thread.critical = orig_critical
end
begin
return __send__(method_name, *args)
ensure
singleton_class.module_eval{ remove_method(method_name) } rescue nil
end
end
end
end
end
end
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