refactor internals, get rid of YAML anchors while still allowing to be lazy

lib/questiongenerator.rb

@@ -1,86 +1,73 @@
 # frozen_string_literal: true
 
-require 'yaml'
+require "yaml"
 
 # Generates some questions.
 module QuestionGenerator
   # Version of QuestionGenerator
-  VERSION = "1.0.0"
+  VERSION = "1.1.0"
 
   class << self
     # The base path to the questions (e.g. +'/home/nilsding/questions'+).
-    attr_accessor :question_base_path
+    attr_reader   :question_base_path
     # The default locale, as a symbol.
     attr_accessor :default_locale
   end
 
+  module_function
+
   # Generates a new question.
   # @param options [Hash] A customizable set of options.
-  # @option options [Symbol] :locale (@default_locale) The target locale
-  # @option options [String] :prefix Prefix of the question, e.g. +'¿'+
-  # @option options [String] :suffix ('?') Suffix of the question, e.g. +' ?'+
-  # @option options [Boolean] :use_compiled (true) Use compiled questions
-  #   instead of generating it.  See also {compile}
+  # @param :locale [Symbol] The target locale
+  # @param :prefix [String] Prefix of the question, e.g. +'¿'+
+  # @param :suffix [String] Suffix of the question, e.g. +' ?'+
   # @return [String] String containing the generated question.
-  def self.generate(options = {})
-    opts = {
-      locale: @default_locale,
-      prefix: '',
-      suffix: '?',
-      use_compiled: true
-    }.merge!(options)
-    if opts[:use_compiled] and !@compiled[opts[:locale]].nil?
-      opts[:prefix] + @compiled[opts[:locale]].sample + opts[:suffix]
-    else
-      questions = YAML.load_file(File.expand_path("#{opts[:locale].to_s}.yml", @question_base_path))
-      opts[:prefix] + get_question(questions).strip + opts[:suffix]
-    end
+  def generate(locale: @default_locale, prefix: "", suffix: "?")
+    compile(locale:) unless @compiled.key?(locale)
+
+    prefix + @compiled[locale].sample + suffix
   end
   
   # Compiles all the questions and stores it into the +@compiled+ hash.
-  # @param options [Hash] A customizable set of options.
-  # @option options [Symbol] :locale (@default_locale) The target locale
-  def self.compile(options = {})
-    opts = { 
-      locale: @default_locale
-    }.merge!(options)
-    questions = YAML.load_file(File.expand_path("#{opts[:locale].to_s}.yml", @question_base_path))
-    @compiled[@default_locale] = build(questions)
+  # @param :locale [Symbol] The target locale
+  def compile(locale: @default_locale)
+    questions = YAML.load_file(File.expand_path("#{locale}.yml", @question_base_path))
+    @compiled[locale] = build(questions)
+  end
+
+  def question_base_path=(path)
+    raise Errno::ENOENT.new(path) unless Dir.exist?(path)
+
+    @compiled = {} # new dir, force a recompile
+    @question_base_path = path
   end
 
   private
 
-    def self.get_question questions
-      question = ""
-      if questions.is_a? Hash
-        key = questions.keys.sample
-        value = questions[key]
-        question = "#{key} #{get_question(value)}"
-      elsif questions.is_a? Array
-        question = get_question questions.sample
-      elsif questions.is_a? String
-        question = questions
-      end
-      question
-    end
+  module_function
 
-    def self.build(questions, q = "")
+  def build(questions, q = "")
     ary = []
-      if questions.is_a? Hash
+
+    case questions
+    when Hash
       questions.each do |k, v|
-          ary << build(v, "#{q}#{k} ")
+        Array(k).each do |variant|
+          ary << build(v, "#{q}#{variant} ")
         end
-      elsif questions.is_a? Array
+      end
+    when Array
       questions.each do |v|
         ary << build(v, q)
       end
-      elsif questions.is_a? String
+    when String
       return "#{q}#{questions}".strip
     end
+
     ary.flatten
   end
 
-    @question_base_path = File.expand_path("../questions/", __FILE__)
+  @question_base_path = File.expand_path("./questions/", __dir__)
   @default_locale = :en
   @compiled = {}
 end

lib/questions/en.yml

@@ -47,17 +47,14 @@ Do:
         - muffins
         - video games
       know:
-        too:
-          much:
-            about: &friends_know_much
+        [much, too much]:
+          about:
             - your:
               - life
               - hobbies
               - family
               - friends
             - you
-        much:
-          about: *friends_know_much
 What:
   - was:
       the:
@@ -118,11 +115,10 @@ What:
             - foxes
             - dogs
             - lizards
-  - activity: &activity
+  - [activity, activities]:
       do:
         you:
           - enjoy the most
-  - activities: *activity
   - kind:
       of:
         animals:
@@ -133,7 +129,7 @@ What:
           really:
             find:
               cute:
-                - in a person?
+                - in a person
   - is:
       your:
         - first memory
@@ -169,7 +165,7 @@ What:
               - Facebook
               - YouTube
       the:
-        best: &is_the_best
+        [best, worst]:
           thing:
             - about:
                 the:
@@ -188,7 +184,6 @@ What:
           fast:
             food:
               - chain
-        worst: *is_the_best
       one:
         - thing you would like to become better at
   - was:
@@ -199,10 +194,9 @@ What:
               - did
               - ate
               - looked for
-        best: &was_the_best
+        [best, worst]:
           thing:
             - "you've eaten so far"
-        worst: *was_the_best
   - languages do you know
   - apps do you use daily
   - 'is heavier: a kilogram of steel, or a kilogram of feathers'
@@ -219,6 +213,7 @@ Can:
         - piano
         - guitar
         - trumpet
+        - saxophone
       - baseball
     - ski
     - cook