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November 27, 2015 04:02
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Ruby DSL sample from thoughtbot blog: https://robots.thoughtbot.com/writing-a-domain-specific-language-in-ruby
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| # https://robots.thoughtbot.com/writing-a-domain-specific-language-in-ruby | |
| module Smokestack | |
| @registry = {} | |
| def self.registry | |
| @registry | |
| end | |
| def self.define(&block) | |
| definition_proxy = DefinitionProxy.new | |
| definition_proxy.instance_eval &block | |
| end | |
| def self.build(factory_name, overrides = {}) | |
| factory_class = const_get factory_name.capitalize | |
| instance = factory_class.new | |
| factory = registry[factory_name] | |
| attributes = factory.attributes.merge overrides | |
| attributes.each do |attribute_name, value| | |
| instance.send "#{attribute_name}=", value | |
| end | |
| end | |
| end | |
| class DefinitionProxy | |
| def factory(factory_name, &block) | |
| factory = Factory.new | |
| factory.instance_eval &block | |
| Smokestack.registry[factory_name] = factory | |
| end | |
| end | |
| class Factory < BasicObject | |
| def initialize | |
| @attributes = {} | |
| end | |
| attr_reader :attributes | |
| def method_missing(name, *args, &block) | |
| attributes[name] = args[0] | |
| end | |
| end | |
| class User | |
| attr_accessor :name, :pet_name | |
| end | |
| class Post | |
| end | |
| Smokestack.define do | |
| factory :user do | |
| name "Gabe B-W" | |
| pet_name "Toto" | |
| end | |
| end | |
| puts Smokestack.build(:user).inspect |
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