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require 'yaml'
module ActiveSupport
module Deprecation
mattr_accessor :debug
self.debug = false
# Choose the default warn behavior according to RAILS_ENV.
# Ignore deprecation warnings in production.
DEFAULT_BEHAVIORS = {
'test' => Proc.new { |message, callstack|
$stderr.puts(message)
$stderr.puts callstack.join("\n ") if debug
},
'development' => Proc.new { |message, callstack|
RAILS_DEFAULT_LOGGER.warn message
RAILS_DEFAULT_LOGGER.debug callstack.join("\n ") if debug
}
}
class << self
def warn(message = nil, callstack = caller)
behavior.call(deprecation_message(callstack, message), callstack) if behavior && !silenced?
end
def default_behavior
if defined?(RAILS_ENV)
DEFAULT_BEHAVIORS[RAILS_ENV.to_s]
else
DEFAULT_BEHAVIORS['test']
end
end
# Have deprecations been silenced?
def silenced?
@silenced = false unless defined?(@silenced)
@silenced
end
# Silence deprecation warnings within the block.
def silence
old_silenced, @silenced = @silenced, true
yield
ensure
@silenced = old_silenced
end
attr_writer :silenced
private
def deprecation_message(callstack, message = nil)
message ||= "You are using deprecated behavior which will be removed from Rails 2.0."
"DEPRECATION WARNING: #{message} See http://www.rubyonrails.org/deprecation for details. #{deprecation_caller_message(callstack)}"
end
def deprecation_caller_message(callstack)
file, line, method = extract_callstack(callstack)
if file
if line && method
"(called from #{method} at #{file}:#{line})"
else
"(called from #{file}:#{line})"
end
end
end
def extract_callstack(callstack)
if md = callstack.first.match(/^(.+?):(\d+)(?::in `(.*?)')?/)
md.captures
else
callstack.first
end
end
end
# Behavior is a block that takes a message argument.
mattr_accessor :behavior
self.behavior = default_behavior
# Warnings are not silenced by default.
self.silenced = false
module ClassMethods
# Declare that a method has been deprecated.
def deprecate(*method_names)
options = method_names.last.is_a?(Hash) ? method_names.pop : {}
method_names = method_names + options.keys
method_names.each do |method_name|
alias_method_chain(method_name, :deprecation) do |target, punctuation|
class_eval(<<-EOS, __FILE__, __LINE__)
def #{target}_with_deprecation#{punctuation}(*args, &block)
::ActiveSupport::Deprecation.warn(self.class.deprecated_method_warning(:#{method_name}, #{options[method_name].inspect}), caller)
#{target}_without_deprecation#{punctuation}(*args, &block)
end
EOS
end
end
end
def deprecated_method_warning(method_name, message=nil)
warning = "#{method_name} is deprecated and will be removed from Rails #{deprecation_horizon}"
case message
when Symbol then "#{warning} (use #{message} instead)"
when String then "#{warning} (#{message})"
else warning
end
end
def deprecation_horizon
'2.0'
end
end
module Assertions
def assert_deprecated(match = nil, &block)
result, warnings = collect_deprecations(&block)
assert !warnings.empty?, "Expected a deprecation warning within the block but received none"
if match
match = Regexp.new(Regexp.escape(match)) unless match.is_a?(Regexp)
assert warnings.any? { |w| w =~ match }, "No deprecation warning matched #{match}: #{warnings.join(', ')}"
end
result
end
def assert_not_deprecated(&block)
result, deprecations = collect_deprecations(&block)
assert deprecations.empty?, "Expected no deprecation warning within the block but received #{deprecations.size}: \n #{deprecations * "\n "}"
result
end
private
def collect_deprecations
old_behavior = ActiveSupport::Deprecation.behavior
deprecations = []
ActiveSupport::Deprecation.behavior = Proc.new do |message, callstack|
deprecations << message
end
result = yield
[result, deprecations]
ensure
ActiveSupport::Deprecation.behavior = old_behavior
end
end
# Stand-in for @request, @attributes, etc.
class DeprecatedInstanceVariableProxy
instance_methods.each { |m| undef_method m unless m =~ /^__/ }
def initialize(instance, method, var = "@#{method}")
@instance, @method, @var = instance, method, var
end
private
def method_missing(called, *args, &block)
warn caller, called, args
target.__send__(called, *args, &block)
end
def target
@instance.__send__(@method)
end
def warn(callstack, called, args)
ActiveSupport::Deprecation.warn("#{@var} is deprecated! Call #{@method}.#{called} instead of #{@var}.#{called}. Args: #{args.inspect}", callstack)
end
end
end
end
class Module
include ActiveSupport::Deprecation::ClassMethods
end
module Test
module Unit
class TestCase
include ActiveSupport::Deprecation::Assertions
end
end
end
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