Class: Module

Inherits:
Object show all
Defined in:
lib/traits.rb,
lib/traits-0.10.0.rb

Instance Method Summary collapse

Instance Method Details

#__trait_define_class_reader_traits(*args, &block) ⇒ Object 



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# File 'lib/traits.rb', line 349

def __trait_define_class_reader_traits(*args, &block)
#--{{{
  __trait_define_singleton_reader_traits(*args, &block)
#--}}}
end

#__trait_define_class_traits(*args, &block) ⇒ Object 



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# File 'lib/traits.rb', line 389

def __trait_define_class_traits(*args, &block)
#--{{{
  __trait_define_singleton_traits(*args, &block)
#--}}}
end

#__trait_define_class_writer_traits(*args, &block) ⇒ Object 



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# File 'lib/traits.rb', line 369

def __trait_define_class_writer_traits(*args, &block)
#--{{{
  __trait_define_singleton_writer_traits(*args, &block)
#--}}}
end

#__trait_define_instance_reader_traits(*args, &block) ⇒ Object 



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# File 'lib/traits.rb', line 272

def __trait_define_instance_reader_traits(*args, &block)
#--{{{
  if __trait_singleton?
    return(__trait_singleton_super.__trait_define_singleton_reader_traits(*args, &block))
  end
  argf = __trait_arg_filter args, &block
  defaults = __trait_instance_method_defaults
  list = __trait_instance_method_list 
  mhooks = __trait_instance_method_hooks
  argf['names_and_defaults'].each do |name, default|
    __trait_define_reader_trait name, default, defaults, list
  end
  argf['names_and_hooks'].each{|name, hooks| mhooks[name].update hooks}
  __trait_search_path.map{|ta| ta.__trait_instance_method_list['readers']}.flatten
#--}}}
end

#__trait_define_instance_traits(*args, &block) ⇒ Object 



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# File 'lib/traits.rb', line 332

def __trait_define_instance_traits(*args, &block)
#--{{{
  writers = __trait_define_instance_writer_traits(*args, &block)
  readers = __trait_define_instance_reader_traits(*args, &block)
  #[readers, writers]
  wr = writers.inject({}){|h,k| h.update k.delete('=') => k}
  readers.map{|r| [r, wr[r]]}
#--}}}
end

#__trait_define_instance_writer_traits(*args, &block) ⇒ Object 



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# File 'lib/traits.rb', line 302

def __trait_define_instance_writer_traits(*args, &block)
#--{{{
  if __trait_singleton?
    return(__trait_singleton_super.__trait_define_singleton_writer_traits(*args, &block))
  end
  argf = __trait_arg_filter args, &block
  defaults = __trait_instance_method_defaults
  list = __trait_instance_method_list 
  mhooks = __trait_instance_method_hooks
  argf['names_and_defaults'].each do |name, default|
    __trait_define_writer_trait name, default, defaults, list
  end
  argf['names_and_hooks'].each{|name, hooks| mhooks[name].update hooks}
  __trait_search_path.map{|ta| ta.__trait_instance_method_list['writers']}.flatten
#--}}}
end

#__trait_define_reader_trait(name, default, defaults, list) ⇒ Object 



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# File 'lib/traits.rb', line 401

def __trait_define_reader_trait name, default, defaults, list
#--{{{
    getter = "#{ name }"
    setter = "#{ name }="
    query = "#{ name }?"
    toggle = "#{ name }!"

    defaults[getter] = default if default
    list['readers'] << getter 
    list['readers'].uniq!
    # list['readers'].sort!

    unless instance_methods.include? getter
      code = __trait_gen_reader_code name, 'public'
      __trait_module_eval code
    end
    unless instance_methods.include? setter
      code = __trait_gen_writer_code name, 'private'
      __trait_module_eval code
    end
    unless instance_methods.include? query
      code = __trait_gen_query_code name, 'public'
      __trait_module_eval code
    end
    unless instance_methods.include? toggle
      code = __trait_gen_toggle_code name, 'private'
      __trait_module_eval code
    end
#--}}}
end

#__trait_define_writer_trait(name, default, defaults, list) ⇒ Object 



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# File 'lib/traits.rb', line 432

def __trait_define_writer_trait name, default, defaults, list
#--{{{
    reader = "#{ name }"
    writer = "#{ name }="
    query = "#{ name }?"
    toggle = "#{ name }!"

    defaults[reader] = default if default
    list['writers'] << writer 
    list['writers'].uniq!
    # list['writers'].sort!

    unless instance_methods.include? reader
      code = __trait_gen_reader_code name, 'private'
      __trait_module_eval code
    end
    unless instance_methods.include? writer
      code = __trait_gen_writer_code name, 'public'
      __trait_module_eval code
    end
    unless instance_methods.include? query
      code = __trait_gen_query_code name, 'private'
      __trait_module_eval code
    end
    unless instance_methods.include? toggle
      code = __trait_gen_toggle_code name, 'public'
      __trait_module_eval code
    end
#--}}}
end

#__trait_gen_access_protection_code(name, access_protection = nil) ⇒ Object 



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# File 'lib/traits.rb', line 860

def __trait_gen_access_protection_code name, access_protection = nil 
#--{{{
  access_protection ||= 'public' 
  access_protection_code =
    case access_protection
      when %r/private/
        "private '#{ name }'.intern"
      when %r/protected/
        "protected '#{ name }'.intern"
      else
        "public '#{ name }'.intern"
    end
  puts access_protection_code if Traits::DEBUG
  access_protection_code
#--}}}
end

#__trait_gen_query_code(name, access_protection = 'public') ⇒ Object 



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# File 'lib/traits.rb', line 665

def __trait_gen_query_code name, access_protection = 'public' 
#--{{{
  query_code = <<-code
    def #{ name }?
      send('#{ name }') ? true : false
    end
    # #{ access_protection } '#{ name }?'.intern
  code
  puts query_code if Traits::DEBUG
  query_code
#--}}}
end

#__trait_gen_reader_code(name, access_protection = 'public') ⇒ Object 



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# File 'lib/traits.rb', line 463

def __trait_gen_reader_code name, access_protection = 'public' 
#--{{{
  s = __trait_singleton?
  klass = s ? 'self' : 'self.class'
  defaults = s ? '__trait_singleton_method_defaults' : '__trait_instance_method_defaults'
  search_ancestors = s ? 'true' : 'false'

  getter_meth = "#{ name }"
  setter_meth = "#{ name }="
  query_meth = "#{ name }?"
  ivar = "@#{ name }"
  getter = "'#{ name }'"
  setter = "'#{ name }='"

  reader_code = <<-code
    def #{ name }(*a, &b)
      unless a.empty?
        send('#{ name }=', *a, &b)
      else
        #unless(defined?(@________#{ name }_set) and @________#{ name }_set)
        unless defined? @#{ name }
          #{ klass }::__trait_search_path.each do |obj|
              defaults = obj.#{ defaults }
              if defaults.has_key? '#{ name }'
                d = defaults['#{ name }']
                if d.respond_to? '__trait_default'
                  d = instance_eval &d
                end
                return(send('#{ name }=', d))
              end
          end
        end
        case self
          when Class
            if defined? @#{ name }
              @#{ name }
            else
              __trait_search_path.each do |obj|
                if self != obj and obj.respond_to? '#{ name }'
                  return(obj.send('#{ name }', *a,  &b))
                end
              end
              return nil
            end
          else
            defined? @#{ name } and @#{ name }
        end
      end
    end
    #{ access_protection } '#{ name }'.intern
  code
  puts reader_code if Traits::DEBUG
  reader_code
#--}}}
end

#__trait_gen_toggle_code(name, access_protection = 'public') ⇒ Object 



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# File 'lib/traits.rb', line 678

def __trait_gen_toggle_code name, access_protection = 'public' 
#--{{{
  s = __trait_singleton?
  klass = s ? 'self' : 'self.class'
  hooks = s ? '__trait_singleton_method_hooks' : '__trait_instance_method_hooks'

  writer_code = <<-code
    def #{ name }!
      hooks = {}
      hook_types = %w( pre munge cast type ducktype validate post toggle )

      #{ klass }::__trait_search_path.each do |obj|

        break if hooks.values_at(*hook_types).compact.size == hook_types.size

        hook_types.each{|ht| hooks[ht] ||= obj.#{ hooks }['#{ name }'][ht]}

      end

      pre_hook, munge_hook, cast_hook, type_hook, ducktype_hook, validate_hook, post_hook, toggle_hook = 
        hooks.values_at(*hook_types) 

      toggle =
        if defined? @________#{ name }_toggle
          @________#{ name }_toggle
        else
          if toggle_hook
            case toggle_hook
              when Proc
                t = Object.new
                sc = class << t 
                  self
                end
                sc.module_eval{
                  define_method 'shift' do
                    toggle_hook.call
                  end
                  define_method 'push' do
                  end
                }
                t
              when Enumerable
                toggle_hook.to_a
              when NilClass, TrueClass 
                @________#{ name }_toggle = [true, false] 
              else
                if toggle_hook.respond_to?('shift') and toggle_hook.respond_to?('push')
                  toggle_hook
                else
                  raise "bad toggle <\#{ toggle_hook.inspect }>"
                end
            end
          else
            @________#{ name }_toggle = [true, false] 
          end
        end

      value = toggle.shift
      toggle.push value

      if pre_hook
        [ pre_hook ].flatten.each do |pre|
          if Proc === pre 
            case pre.arity
              when 0
                __trait_evaluate &pre
              when 1
                __trait_evaluate value, &pre
              else
                __trait_evaluate "#{ name }", value, &pre
            end
          else
            case method("\#{ pre }").arity
              when 0
                send "\#{ pre }"
              when 1
                send "\#{ pre }", value
              else
                send "\#{ pre }", "#{ name }", value
            end
          end
        end
      end

      if cast_hook
        [ cast_hook ].flatten.each do |cast|
          value =
            if Proc === cast
              __trait_evaluate value, &cast
            else
              send cast, value
            end
        end
      end

      if munge_hook
        [ munge_hook ].flatten.each do |munge|
          value =
            if Proc === munge
              __trait_evaluate value, &munge
            else
              value.send munge
            end
        end
      end

      if type_hook
        [ type_hook ].flatten.each do |type|
          is_valid = 
            if Proc === type
              __trait_evaluate(value, &type) === value
            else
              type === value
            end
          raise ArgumentError, 
            "validation of <\#{ value.inspect }> failed!" unless is_valid
        end
      end

      if ducktype_hook
        [ ducktype_hook ].flatten.each do |ducktype|
          is_valid = 
            if Proc === ducktype
              value.respond_to? __trait_evaluate(value, &ducktype)
            else
              value.respond_to? ducktype
            end
          raise ArgumentError, 
            "validation of <\#{ value.inspect }> failed!" unless is_valid
        end
      end

      if validate_hook
        [ validate_hook ].flatten.each do |validate|
          is_valid = 
            if Proc === validate
              __trait_evaluate value, &validate
            else
              send "\#{ validate }", value
            end
          raise ArgumentError, 
            "validation of <\#{ value.inspect }> failed!" unless is_valid
        end
      end

      @#{ name } = value 

      #@________#{ name }_set = true 

      if post_hook
        [ post_hook ].flatten.each do |post|
          if Proc === post 
            case post.arity
              when 0
                __trait_evaluate &post
              when 1
                __trait_evaluate value, &post
              else
                __trait_evaluate "#{ name }", value, &post
            end
          else
            case method("\#{ post }").arity
              when 0
                send "\#{ post }"
              when 1
                send "\#{ post }", value
              else
                send "\#{ post }", "#{ name }", value
            end
          end
        end
      end

      @#{ name }
    end
    #{ access_protection } '#{ name }='.intern
  code
  puts writer_code if Traits::DEBUG
  writer_code
#--}}}
end

#__trait_gen_writer_code(name, access_protection = 'public') ⇒ Object 



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# File 'lib/traits.rb', line 519

def __trait_gen_writer_code name, access_protection = 'public' 
#--{{{
  s = __trait_singleton?
  klass = s ? 'self' : 'self.class'
  hooks = s ? '__trait_singleton_method_hooks' : '__trait_instance_method_hooks'

  writer_code = <<-code
    def #{ name }=(head, *tail)
      value = tail.empty? ? head : [head] + tail

      hooks = {}
      hook_types = %w( pre munge cast type ducktype validate post )

      #{ klass }::__trait_search_path.each do |obj|

        break if hooks.values_at(*hook_types).compact.size == hook_types.size

        hook_types.each{|ht| hooks[ht] ||= obj.#{ hooks }['#{ name }'][ht]}

      end

      pre_hook, munge_hook, cast_hook, type_hook, ducktype_hook, validate_hook, post_hook = 
        hooks.values_at(*hook_types) 

      if pre_hook
        [ pre_hook ].flatten.each do |pre|
          if Proc === pre 
            case pre.arity
              when 0
                __trait_evaluate &pre
              when 1
                __trait_evaluate value, &pre
              else
                __trait_evaluate "#{ name }", value, &pre
            end
          else
            case method("\#{ pre }").arity
              when 0
                send "\#{ pre }"
              when 1
                send "\#{ pre }", value
              else
                send "\#{ pre }", "#{ name }", value
            end
          end
        end
      end

      if cast_hook
        [ cast_hook ].flatten.each do |cast|
          value =
            if Proc === cast
              __trait_evaluate value, &cast
            else
              send cast, value
            end
        end
      end

      if munge_hook
        [ munge_hook ].flatten.each do |munge|
          value =
            if Proc === munge
              __trait_evaluate value, &munge
            else
              value.send munge
            end
        end
      end

      if type_hook
        [ type_hook ].flatten.each do |type|
          is_valid = 
            if Proc === type
              __trait_evaluate(value, &type) === value
            else
              type === value
            end
          raise ArgumentError, 
            "validation of <\#{ value.inspect }> failed!" unless is_valid
        end
      end

      if ducktype_hook
        [ ducktype_hook ].flatten.each do |ducktype|
          is_valid = 
            if Proc === ducktype
              value.respond_to? __trait_evaluate(value, &ducktype)
            else
              value.respond_to? ducktype
            end
          raise ArgumentError, 
            "validation of <\#{ value.inspect }> failed!" unless is_valid
        end
      end

      if validate_hook
        [ validate_hook ].flatten.each do |validate|
          is_valid = 
            if Proc === validate
              __trait_evaluate value, &validate
            else
              send "\#{ validate }", value
            end
          raise ArgumentError, 
            "validation of <\#{ value.inspect }> failed!" unless is_valid
        end
      end

      @#{ name } = value 

      #@________#{ name }_set = true 

      if post_hook
        [ post_hook ].flatten.each do |post|
          if Proc === post 
            case post.arity
              when 0
                __trait_evaluate &post
              when 1
                __trait_evaluate value, &post
              else
                __trait_evaluate "#{ name }", value, &post
            end
          else
            case method("\#{ post }").arity
              when 0
                send "\#{ post }"
              when 1
                send "\#{ post }", value
              else
                send "\#{ post }", "#{ name }", value
            end
          end
        end
      end

      @#{ name }
    end
    #{ access_protection } '#{ name }='.intern
  code
  puts writer_code if Traits::DEBUG
  writer_code
#--}}}
end

#__trait_module_eval(*a, &b) ⇒ Object

–{{{



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# File 'lib/traits.rb', line 261

def __trait_module_eval(*a, &b)
#--{{{
  begin
    module_eval(*a, &b)
  rescue Exception => e
    STDERR.puts([a, b].inspect) if Traits::DEBUG
    raise
  end
#--}}}
end