Created
October 13, 2016 17:08
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Have some respect, and show some class!
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| module Classy | |
| module Errors | |
| def self.included(base) | |
| base.extend(ClassMethods.clone) | |
| base.private_class_method :error | |
| end | |
| module ClassMethods | |
| def error(name, super_klass = StandardError) | |
| klass_name = name.to_s.split('_').map(&:capitalize).join | |
| klass = Class.new(super_klass) | |
| const_set "#{klass_name}Error", klass | |
| end | |
| end | |
| private | |
| def error!(name) | |
| klass_name = name.to_s.split('_').map(&:capitalize).join | |
| raise self.class.const_get("#{klass_name}Error") | |
| end | |
| end | |
| module Builder | |
| def self.included(base) | |
| base.extend(ClassMethods.clone) | |
| base.private_class_method :builder | |
| end | |
| module ClassMethods | |
| DEFAULT_BUILDER_OPTIONS = { | |
| set_instance_variables?: true | |
| }.freeze | |
| def builder(options = DEFAULT_BUILDER_OPTIONS, &block) | |
| @@opt_args = [] | |
| @@rest_args = [] | |
| @@block_args = [] | |
| @@klass = Class.new(Object) | |
| block.parameters.each do |kind, arg| | |
| case kind | |
| when :opt | |
| @@opt_args << arg | |
| @@klass.send :define_method, arg.to_s do |opt| | |
| instance_variable_set "@#{arg}", opt | |
| end | |
| when :rest | |
| @@rest_args << arg | |
| @@klass.send :define_method, arg.to_s do |*rest| | |
| instance_variable_set "@#{arg}", rest | |
| end | |
| when :block | |
| @@block_args << arg | |
| @@klass.send :define_method, arg.to_s do |&bblock| | |
| instance_variable_set "@#{arg}", bblock | |
| end | |
| end | |
| end | |
| if options[:set_instance_variables?] | |
| define_method :initialize do |*new_args, &new_block| | |
| opts = @@opt_args.map { |oa| [oa, new_args.shift] } | |
| rests = @@rest_args.map { |ra| [ra, new_args] } | |
| blocks = @@block_args.map { |ba| [ba, new_block] } | |
| (opts + rests + blocks).each do |name, val| | |
| instance_variable_set "@#{name}", val | |
| end | |
| block_args = opts.map(&:last) | |
| rests.map(&:last).each { |rest| block_args += rest } | |
| instance_exec(*block_args, &block) | |
| end | |
| else | |
| define_method :initialize, &block | |
| end | |
| end | |
| def build(&block) | |
| builder = @@klass.new | |
| builder.instance_eval(&block) if block_given? | |
| args = @@opt_args.map do |arg| | |
| builder.instance_variable_get "@#{arg}" | |
| end | |
| if rest_arg = @@rest_args.first | |
| ra = builder.instance_variable_get("@#{rest_arg}") | |
| args += ra if ra | |
| end | |
| if block_arg = @@block_args.first | |
| ba = builder.instance_variable_get("@#{block_arg}") | |
| new(*args, &ba) | |
| else | |
| new(*args) | |
| end | |
| end | |
| end | |
| end | |
| end | |
| class Message | |
| include Classy::Errors | |
| include Classy::Builder | |
| error :bad_subject | |
| error :no_subject | |
| error :no_body | |
| attr_reader :subject, :body, :args | |
| builder do |subject, body, *args, &delivery| | |
| error! :no_subject unless @subject | |
| error! :bad_subject unless @subject =~ /awesome/i | |
| error! :no_body unless @body | |
| end | |
| def deliver | |
| instance_eval(&@delivery) if @delivery | |
| end | |
| end | |
| class AutoDeliveredMessage < Message | |
| def initialize(*as) | |
| super(*as) | |
| deliver | |
| end | |
| end | |
| require 'json' | |
| m1 = Message.build do | |
| subject 'testy awesome test' | |
| body 'ya boi' | |
| end | |
| m2 = Message.build do | |
| subject 'aight but awesome' | |
| body 'ya boi' | |
| args 'one', 'two', 'three' | |
| delivery do | |
| puts JSON.pretty_generate( | |
| kind: :message, | |
| subject: subject, | |
| body: body, | |
| args: args | |
| ) | |
| end | |
| end | |
| m3 = Message.new('not awesome', 'but works', 'test', 'test', 'test') do | |
| puts JSON.pretty_generate( | |
| kind: :message, | |
| subject: subject, | |
| body: body, | |
| args: args | |
| ) | |
| end | |
| m1.deliver | |
| m2.deliver | |
| m3.deliver | |
| AutoDeliveredMessage.build do | |
| subject 'pretty awesome' | |
| body 'and works' | |
| delivery do | |
| puts JSON.pretty_generate( | |
| kind: :message, | |
| subject: subject, | |
| body: body, | |
| args: args | |
| ) | |
| end | |
| end |
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