class Constructable::Constructor
Attributes
attributes[RW]
Public Class Methods
new(base)
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# File lib/constructable/constructor.rb, line 5 def initialize(base) @attributes = [] @module = Module.new @base = base @base.send :include, @module self.redefine_new_calling self.define_concstructable_attributes_method end
Public Instance Methods
construct(constructor_hash, obj)
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# File lib/constructable/constructor.rb, line 59 def construct(constructor_hash, obj) constructor_hash ||= {} @attributes.each do |attribute| obj.instance_variable_set attribute.ivar_symbol, attribute.process(constructor_hash[attribute.name]) end end
define_attributes(attributes)
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# File lib/constructable/constructor.rb, line 43 def define_attributes(attributes) attributes = generate_attributes(attributes) @attributes.concat attributes attributes = @attributes attributes.each do |attribute| @module.module_eval do attr_reader attribute.name if attribute.readable define_method(attribute.attr_writer_symbol) do |value| instance_variable_set attribute.ivar_symbol, attribute.process(value) end if attribute.writable end end end
define_concstructable_attributes_method()
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# File lib/constructable/constructor.rb, line 78 def define_concstructable_attributes_method constructor = self @base.module_eval do define_method :constructable_attributes do Hash[ constructor.attributes .map { |a| [a.name,instance_variable_get(a.ivar_symbol)] } .select(&:last) ] end end end
generate_attributes(attributes)
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# File lib/constructable/constructor.rb, line 66 def generate_attributes(attributes) options = if Hash === attributes.last attributes.pop else {} end attributes.map do |attribute| Attribute.new(attribute, options) end end
redefine_new(klass)
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# File lib/constructable/constructor.rb, line 32 def redefine_new(klass) constructor = self klass.define_singleton_method(:new) do |*args, &block| obj = self.allocate constructor_hash = Hash === args.last ? args.last : {} constructor.construct(constructor_hash, obj) obj.send :initialize, *args, &block obj end end
redefine_new_calling()
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# File lib/constructable/constructor.rb, line 14 def redefine_new_calling case @base when Class self.redefine_new(@base) when Module constructor = self redefine_new_logic = proc do |base| base.instance_variable_set(:@constructor, constructor) if Class == base.class constructor.redefine_new(base) elsif Module == base.class base.define_singleton_method :included, &redefine_new_logic end end @base.define_singleton_method :included, &redefine_new_logic end end