lib/hashr.rb in hashr-0.0.4 vs lib/hashr.rb in hashr-0.0.5

@@ -2,10 +2,12 @@
   autoload :EnvDefaults, 'hashr/env_defaults'
 
   TEMPLATE = new
 
   class << self
+    attr_accessor :raise_missing_keys
+
     def define(definition)
       @definition = definition
     end
 
     def definition
@@ -31,14 +33,19 @@
     when '?'
       !!self[name.to_s[0..-2].to_sym]
     when '='
       self[name.to_s[0..-2].to_sym] = args.first
     else
-      self[name]
+      read(name)
     end
   end
 
   protected
+
+    def read(key)
+      raise(IndexError.new("Key #{key.inspect} is not defined.")) if !key?(key) && self.class.raise_missing_keys
+      self[key]
+    end
 
     def include_modules(modules)
       Array(modules).each { |mod| meta_class.send(:include, mod) } if modules
     end