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module ActiveSupport
class Deprecation
module Reporting
# Whether to print a message (silent mode)
attr_accessor :silenced
# Name of gem where method is deprecated
attr_accessor :gem_name
# 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 = nil)
return if silenced
callstack ||= caller_locations(2)
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 deprecation_warning(deprecated_method_name, message = nil, caller_backtrace = nil)
caller_backtrace ||= caller_locations(2)
deprecated_method_warning(deprecated_method_name, message).tap do |msg|
warn(msg, caller_backtrace)
end
end
private
# Outputs a deprecation warning message
#
# ActiveSupport::Deprecation.deprecated_method_warning(:method_name)
# # => "method_name is deprecated and will be removed from Rails #{deprecation_horizon}"
# ActiveSupport::Deprecation.deprecated_method_warning(:method_name, :another_method)
# # => "method_name is deprecated and will be removed from Rails #{deprecation_horizon} (use another_method instead)"
# ActiveSupport::Deprecation.deprecated_method_warning(:method_name, "Optional message")
# # => "method_name is deprecated and will be removed from Rails #{deprecation_horizon} (Optional message)"
def deprecated_method_warning(method_name, message = nil)
warning = "#{method_name} is deprecated and will be removed from #{gem_name} #{deprecation_horizon}"
case message
when Symbol then "#{warning} (use #{message} instead)"
when String then "#{warning} (#{message})"
else warning
end
end
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)
return _extract_callstack(callstack) if callstack.first.is_a? String
rails_gem_root = File.expand_path("../../../../..", __FILE__) + "/"
offending_line = callstack.find { |frame|
!frame.absolute_path.start_with?(rails_gem_root)
} || callstack.first
[offending_line.path, offending_line.lineno, offending_line.label]
end
def _extract_callstack(callstack)
warn "Please pass `caller_locations` to the deprecation API" if $VERBOSE
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
end
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