Module: Doodle::ConversionHelper

Included in:
BaseMethods
Defined in:
lib/doodle/conversion.rb

Instance Method Summary collapse

Instance Method Details

#convert(owner, *args) ⇒ Object

convert a value according to conversion rules FIXME: move



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# File 'lib/doodle/conversion.rb', line 20

def convert(owner, *args)
  #pp( { :convert => 1, :owner => owner, :args => args, :conversions => __doodle__.conversions } )
  begin
    args = args.map do |value|
      #!p [:convert, 2, value]
      if (converter = __doodle__.conversions[value.class])
        #p [:convert, 3, value, self, caller]
        value = converter[value]
        #!p [:convert, 4, value]
      else
        #!p [:convert, 5, value]
        # try to find nearest ancestor
        this_ancestors = value.class.ancestors
        #!p [:convert, 6, this_ancestors]
        matches = this_ancestors & __doodle__.conversions.keys
        #!p [:convert, 7, matches]
        indexed_matches = matches.map{ |x| this_ancestors.index(x)}
        #!p [:convert, 8, indexed_matches]
        if indexed_matches.size > 0
          #!p [:convert, 9]
          converter_class = this_ancestors[indexed_matches.min]
          #!p [:convert, 10, converter_class]
          if converter = __doodle__.conversions[converter_class]
            #!p [:convert, 11, converter]
            value = converter[value]
            #!p [:convert, 12, value]
          end
        else
          #!p [:convert, 13, :kind, kind, name, value]
          mappable_kinds = kind.select{ |x| x <= Doodle::Core }
          #!p [:convert, 13.1, :kind, kind, mappable_kinds]
          if mappable_kinds.size > 0
            mappable_kinds.each do |mappable_kind|
              #!p [:convert, 14, :kind_is_a_doodle, value.class, mappable_kind, mappable_kind.doodle.conversions, args]
              if converter = mappable_kind.doodle.conversions[value.class]
                #!p [:convert, 15, value, mappable_kind, args]
                value = converter[value]
                break
              else
                #!p [:convert, 16, :no_conversion_for, value.class]
              end
            end
          else
            #!p [:convert, 17, :kind_has_no_conversions]
          end
        end
      end
      #!p [:convert, 18, value]
      value
    end
  rescue Exception => e
    owner.__doodle__.handle_error name, ConversionError, "#{e.message}", Doodle::Utils.doodle_caller
  end
  if args.size > 1
    args
  else
    args.first
  end
end

#from(*args, &block) ⇒ Object

if block passed, define a conversion from class if no args, apply conversion to arguments



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# File 'lib/doodle/conversion.rb', line 5

def from(*args, &block)
  Doodle::Debug.d { [self, args, block]}
  #p [:from, self, args]
  if block_given?
    # set the rule for each arg given
    args.each do |arg|
      __doodle__.local_conversions[arg] = block
    end
  else
    convert(self, *args)
  end
end