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module ActiveSupport
module Deprecation
attr_accessor :silenced
# Outputs a deprecation warning to the output configured by
# <tt>ActiveSupport::Deprecation.behavior</tt>.
#
# ActiveSupport::Deprecation.warn("something broke!")
# # => "DEPRECATION WARNING: something broke! (called from your_code.rb:1)"
def warn(message = nil, callstack = caller)
return if silenced
deprecation_message(callstack, message).tap do |m|
behavior.each { |b| b.call(m, callstack) }
end
end
# Silence deprecation warnings within the block.
#
# ActiveSupport::Deprecation.warn("something broke!")
# # => "DEPRECATION WARNING: something broke! (called from your_code.rb:1)"
#
# ActiveSupport::Deprecation.silence do
# ActiveSupport::Deprecation.warn("something broke!")
# end
# # => nil
def silence
old_silenced, @silenced = @silenced, true
yield
ensure
@silenced = old_silenced
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})"
end
warning
end
private
def deprecation_message(callstack, message = nil)
message ||= "You are using deprecated behavior which will be removed from the next major or minor release."
message += '.' unless message =~ /\.$/
"DEPRECATION WARNING: #{message} #{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)
rails_gem_root = File.expand_path("../../../../..", __FILE__) + "/"
offending_line = callstack.find { |line| !line.start_with?(rails_gem_root) } || callstack.first
if offending_line
if md = offending_line.match(/^(.+?):(\d+)(?::in `(.*?)')?/)
md.captures
else
offending_line
end
end
end
end
end
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