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module ActiveSupport
module Deprecation
# Choose the default warn behavior according to RAILS_ENV.
# Ignore deprecation warnings in production.
DEFAULT_BEHAVIORS = {
'test' => Proc.new { |message| $stderr.puts message },
'development' => Proc.new { |message| RAILS_DEFAULT_LOGGER.warn message },
}
class << self
def warn(message = nil, callstack = caller)
behavior.call(deprecation_message(callstack, message)) if behavior
end
def default_behavior
DEFAULT_BEHAVIORS[RAILS_ENV.to_s] if defined?(RAILS_ENV)
end
private
def deprecation_message(callstack, message = nil)
file, line, method = extract_callstack(callstack)
message ||= "WARNING: #{method} is deprecated and will be removed from the next Rails release"
"#{message} (#{method} at #{file}:#{line})"
end
def extract_callstack(callstack)
callstack.first.match(/^(.+?):(\d+)(?::in `(.*?)')?/).captures
end
end
# Behavior is a block that takes a message argument.
mattr_accessor :behavior
self.behavior = default_behavior
module ClassMethods
# Declare that a method has been deprecated.
def deprecate(*method_names)
method_names.each do |method_name|
class_eval(<<-EOS, __FILE__, __LINE__)
def #{method_name}_with_deprecation(*args, &block)
::ActiveSupport::Deprecation.warn
#{method_name}_without_deprecation(*args, &block)
end
EOS
alias_method_chain(method_name, :deprecation)
end
end
end
module Assertions
def assert_deprecated(regexp = nil, &block)
last = with_last_message_tracking_deprecation_behavior(&block)
assert last, "Expected a deprecation warning within the block but received none"
if regexp
assert_match regexp, last, "Deprecation warning didn't match #{regexp}: #{last}"
end
end
def assert_not_deprecated(&block)
last = with_last_message_tracking_deprecation_behavior(&block)
assert_nil last, "Expected no deprecation warning within the block but received one: #{last}"
end
private
def with_last_message_tracking_deprecation_behavior
old_behavior = ActiveSupport::Deprecation.behavior
last_message = nil
ActiveSupport::Deprecation.behavior = Proc.new { |message| last_message = message; old_behavior.call(message) if old_behavior }
yield
last_message
ensure
ActiveSupport::Deprecation.behavior = old_behavior
end
end
end
end
class Class
include ActiveSupport::Deprecation::ClassMethods
end
module Test
module Unit
class TestCase
include ActiveSupport::Deprecation::Assertions
end
end
end
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