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Edit File : e2mmap.rb \| Size : 3.77 KB
# #-- # e2mmap.rb - for Ruby 1.1 # $Release Version: 2.0$ # $Revision: 1.10 $ # by Keiju ISHITSUKA # #++ # # Helper module for easily defining exceptions with predefined messages. # # == Usage # # 1. # class Foo # extend Exception2MessageMapper # def_e2message ExistingExceptionClass, "message..." # def_exception :NewExceptionClass, "message..."[, superclass] # ... # end # # 2. # module Error # extend Exception2MessageMapper # def_e2message ExistingExceptionClass, "message..." # def_exception :NewExceptionClass, "message..."[, superclass] # ... # end # class Foo # include Error # ... # end # # foo = Foo.new # foo.Fail .... # # 3. # module Error # extend Exception2MessageMapper # def_e2message ExistingExceptionClass, "message..." # def_exception :NewExceptionClass, "message..."[, superclass] # ... # end # class Foo # extend Exception2MessageMapper # include Error # ... # end # # Foo.Fail NewExceptionClass, arg... # Foo.Fail ExistingExceptionClass, arg... # # module Exception2MessageMapper E2MM = Exception2MessageMapper # :nodoc: def E2MM.extend_object(cl) super cl.bind(self) unless cl < E2MM end def bind(cl) self.module_eval %[ def Raise(err = nil, rest) Exception2MessageMapper.Raise(self.class, err, rest) end alias Fail Raise def self.included(mod) mod.extend Exception2MessageMapper end ] end # Fail(err, rest) # err: exception # rest: message arguments # def Raise(err = nil, rest) E2MM.Raise(self, err, rest) end alias Fail Raise alias fail Raise # def_e2message(c, m) # c: exception # m: message_form # define exception c with message m. # def def_e2message(c, m) E2MM.def_e2message(self, c, m) end # def_exception(n, m, s) # n: exception_name # m: message_form # s: superclass(default: StandardError) # define exception named ``c'' with message m. # def def_exception(n, m, s = StandardError) E2MM.def_exception(self, n, m, s) end # # Private definitions. # # {[class, exp] => message, ...} @MessageMap = {} # E2MM.def_e2message(k, e, m) # k: class to define exception under. # e: exception # m: message_form # define exception c with message m. # def E2MM.def_e2message(k, c, m) E2MM.instance_eval{@MessageMap[[k, c]] = m} c end # E2MM.def_exception(k, n, m, s) # k: class to define exception under. # n: exception_name # m: message_form # s: superclass(default: StandardError) # define exception named ``c'' with message m. # def E2MM.def_exception(k, n, m, s = StandardError) n = n.id2name if n.kind_of?(Fixnum) e = Class.new(s) E2MM.instance_eval{@MessageMap[[k, e]] = m} k.const_set(n, e) end # Fail(klass, err, rest) # klass: class to define exception under. # err: exception # rest: message arguments # def E2MM.Raise(klass = E2MM, err = nil, rest) if form = e2mm_message(klass, err) b = $@.nil? ? caller(1) : $@ b.shift if b[0] =~ /^#{Regexp.quote(__FILE__)}:/ raise err, sprintf(form, rest), b else E2MM.Fail E2MM, ErrNotRegisteredException, err.inspect end end class << E2MM alias Fail Raise end def E2MM.e2mm_message(klass, exp) for c in klass.ancestors if mes = @MessageMap[[c,exp]] m = klass.instance_eval('"' + mes + '"') return m end end nil end class << self alias message e2mm_message end E2MM.def_exception(E2MM, :ErrNotRegisteredException, "not registered exception(%s)") end Back

Edit File : e2mmap.rb | Size : 3.77 KB

#
#--
#   e2mmap.rb - for Ruby 1.1
#       $Release Version: 2.0$
#       $Revision: 1.10 $
#       by Keiju ISHITSUKA
#
#++
#
# Helper module for easily defining exceptions with predefined messages.
#
# == Usage
#
# 1.
#   class Foo
#     extend Exception2MessageMapper
#     def_e2message ExistingExceptionClass, "message..."
#     def_exception :NewExceptionClass, "message..."[, superclass]
#     ...
#   end
#
# 2.
#   module Error
#     extend Exception2MessageMapper
#     def_e2message ExistingExceptionClass, "message..."
#     def_exception :NewExceptionClass, "message..."[, superclass]
#     ...
#   end
#   class Foo
#     include Error
#     ...
#   end
#
#   foo = Foo.new
#   foo.Fail ....
#
# 3.
#   module Error
#     extend Exception2MessageMapper
#     def_e2message ExistingExceptionClass, "message..."
#     def_exception :NewExceptionClass, "message..."[, superclass]
#     ...
#   end
#   class Foo
#     extend Exception2MessageMapper
#     include Error
#     ...
#   end
#
#   Foo.Fail NewExceptionClass, arg...
#   Foo.Fail ExistingExceptionClass, arg...
#
#
module Exception2MessageMapper

E2MM = Exception2MessageMapper # :nodoc:

def E2MM.extend_object(cl)
    super
    cl.bind(self) unless cl < E2MM
  end

def bind(cl)
    self.module_eval %[
      def Raise(err = nil, *rest)
        Exception2MessageMapper.Raise(self.class, err, *rest)
      end
      alias Fail Raise

def self.included(mod)
        mod.extend Exception2MessageMapper
      end
    ]
  end

# Fail(err, *rest)
  #     err:    exception
  #     rest:   message arguments
  #
  def Raise(err = nil, *rest)
    E2MM.Raise(self, err, *rest)
  end
  alias Fail Raise
  alias fail Raise

# def_e2message(c, m)
  #         c:  exception
  #         m:  message_form
  #     define exception c with message m.
  #
  def def_e2message(c, m)
    E2MM.def_e2message(self, c, m)
  end

# def_exception(n, m, s)
  #         n:  exception_name
  #         m:  message_form
  #         s:  superclass(default: StandardError)
  #     define exception named ``c'' with message m.
  #
  def def_exception(n, m, s = StandardError)
    E2MM.def_exception(self, n, m, s)
  end

#
  # Private definitions.
  #
  # {[class, exp] => message, ...}
  @MessageMap = {}

# E2MM.def_e2message(k, e, m)
  #         k:  class to define exception under.
  #         e:  exception
  #         m:  message_form
  #     define exception c with message m.
  #
  def E2MM.def_e2message(k, c, m)
    E2MM.instance_eval{@MessageMap[[k, c]] = m}
    c
  end

# E2MM.def_exception(k, n, m, s)
  #         k:  class to define exception under.
  #         n:  exception_name
  #         m:  message_form
  #         s:  superclass(default: StandardError)
  #     define exception named ``c'' with message m.
  #
  def E2MM.def_exception(k, n, m, s = StandardError)
    n = n.id2name if n.kind_of?(Fixnum)
    e = Class.new(s)
    E2MM.instance_eval{@MessageMap[[k, e]] = m}
    k.const_set(n, e)
  end

# Fail(klass, err, *rest)
  #     klass:  class to define exception under.
  #     err:    exception
  #     rest:   message arguments
  #
  def E2MM.Raise(klass = E2MM, err = nil, *rest)
    if form = e2mm_message(klass, err)
      b = $@.nil? ? caller(1) : $@
      b.shift if b[0] =~ /^#{Regexp.quote(__FILE__)}:/
      raise err, sprintf(form, *rest), b
    else
      E2MM.Fail E2MM, ErrNotRegisteredException, err.inspect
    end
  end
  class << E2MM
    alias Fail Raise
  end

def E2MM.e2mm_message(klass, exp)
    for c in klass.ancestors
      if mes = @MessageMap[[c,exp]]
        m = klass.instance_eval('"' + mes + '"')
        return m
      end
    end
    nil
  end
  class << self
    alias message e2mm_message
  end

E2MM.def_exception(E2MM,
                     :ErrNotRegisteredException,
                     "not registered exception(%s)")
end

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