Current File : /home/rs/ruby/1.8/lib/ruby/gems/1.8/gems/deprecated-2.0.1/lib/deprecated.rb
#
# Deprecated - handle deprecating and executing deprecated code
#
# Version:: 2.0.1
# Author:: Erik Hollensbe
# License:: BSD
# Copyright:: Copyright (c) 2006 Erik Hollensbe
# Contact:: erik@hollensbe.org
#
# Deprecated is intended to ease the programmer's control over
# deprecating and handling deprecated code.
#
# Usage is simple:
#
# # require 'rubygems' if need be
# require 'deprecated'
#
# class Foo
# private
# # rename the original function and make it private
# def monkey
# do stuff...
# end
# # deprecate the function, this will create a 'monkey' method
# # that will call the deprecate warnings
# deprecate :monkey, :private
# end
#
# The 'deprecated' call is injected into the 'Module' class at
# require-time. This allows all classes that are newly-created to
# access the 'deprecate' functionality. The deprecate definition must
# follow the method definition. You may only define one deprecated
# function per call.
#
# Methods deprecated default to 'public'. This is due to a limitation
# in how Ruby handles permission definition. If you're aware of a
# workaround to this problem, please let me know.
#
# You can however change this by providing an optional trailing
# parameter to the 'deprecate' call:
#
# * :public - set the created method to be public
# * :protected - set the created method to be protected
# * :private - set the created method to be private
#
# Note: It's highly recommended that you make your original methods
# private so that they cannot be accessed by outside code.
#
# Deprecated.set_action can change the default action (which is a
# warning printed to stderr) if you prefer. This is ideal for code
# sweeps where deprecated calls have to be removed. Please see the
# documentation for this method to get an idea of the options that are
# available.
#
#--
#
# The compilation of software known as deprecate.rb is distributed under the
# following terms:
# Copyright (C) 2005-2006 Erik Hollensbe. All rights reserved.
#
# Redistribution and use in source form, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer:
#
# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#++
module Deprecated
#
# set_action defines the action that will be taken when code marked
# deprecated is encountered. There are several stock options:
#
# * :warn -- print a warning message to stderr (default)
# * :die -- warn and then terminate the program with error level -1
# * :throw -- throw a DeprecatedError with the message
#
# If a proc is passed instead, it will execute that instead. This
# procedure is passed a single argument, which is the name (NOT the
# symbol) of the method in Class#meth syntax that was called. This
# does not interrupt the calling process (unless you do so
# yourself).
#
# The second argument is the message provided to warnings and throw
# errors and so on. This message is a sprintf-like formatted string
# that takes one argument, which is the Class#meth name as a string.
# This message is not used when you define your own procedure.
#
# Note: ALL code that is marked deprecated will behave in the manner
# that was set at the last call to set_action.
#
# Ex:
#
# # throws with the error message saying: "FIXME: Class#meth"
# Deprecated.set_action(:throw, "FIXME: %s")
#
# # emails your boss everytime you run deprecated code
# Deprecated.set_action proc do |msg|
# f = IO.popen('mail boss@company -s "Joe still hasn't fixed %s"' % msg, 'w')
# f.puts("Sorry, I still haven't fixed %s, please stop making me go to meetings.\n" % msg)
# f.close
# end
#
@@action = nil
def Deprecated.action
return @@action
end
def Deprecated.set_action(action, message="%s is deprecated.")
if action.kind_of? Proc
@@action = action
return
end
case action
when :warn
@@action = proc do |msg|
warn(message % msg)
end
when :die
@@action = proc do |msg|
warn(message % msg)
exit(-1)
end
when :throw
@@action = proc do |msg|
raise DeprecatedError.new(message % msg)
end
end
end
end
#
# This is the class of the errors that the 'Deprecated' module will
# throw if the action type is set to ':throw'.
#
# See Deprecated.set_action for more information.
#
class DeprecatedError < Exception
attr_reader :message
def initialize(msg=nil)
@message = msg
end
end
#
# Start - inject the 'deprecated' method into the 'Module' class and
# set the default action to warn.
#
Module.send(:define_method, :deprecate,
proc do |*args|
sym = args.shift
protection = args.shift || :public
unless sym
raise DeprecatedError.new("Invalid number of arguments passed to 'deprecated' function")
end
old_method = self.instance_method(sym)
define_method(sym) do |*sendparams|
Deprecated.action.call(self.class.to_s + '#' + sym.to_s)
new_method = self.class.instance_method(sym)
retval = old_method.bind(self).call(*sendparams)
new_method.bind(self)
return retval
end
case protection
when :public
public(sym)
when :private
private(sym)
when :protected
protected(sym)
end
end)
Deprecated.set_action(:warn)
Deprecate = Deprecated
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