Fix staged_path and caskroom_path in DSL

Fixes #15910.

lib/hbc/cask.rb

@@ -14,16 +14,6 @@ class Hbc::Cask
     @token = self.class.token
   end
 
-  def caskroom_path
-    Hbc.caskroom.join(token)
-  end
-
-  # todo: move to staged.rb ?
-  def staged_path
-    cask_version = version ? version : :unknown
-    caskroom_path.join(cask_version.to_s)
-  end
-
   METADATA_SUBDIR = '.metadata'
 
   def metadata_master_container_path

lib/hbc/dsl.rb

@@ -222,11 +222,13 @@ module Hbc::DSL
     end
 
     def caskroom_path
-      @caskroom_path ||= self.caskroom
+      @caskroom_path ||= Hbc.caskroom.join(self.token)
     end
 
     def staged_path
-      @staged_path ||= self.caskroom.join(self.name, self.version)
+      return @staged_path if @staged_path
+      cask_version = self.version || :unknown
+      @staged_path = self.caskroom_path.join(cask_version.to_s)
     end
 
     def caveats(*string, &block)

lib/hbc/without_source.rb

@@ -1,13 +1,21 @@
 class Hbc::WithoutSource < Hbc::Cask
-  def staged_path
-    caskroom_path.children.first
-  end
-
   def initialize(sourcefile_path=nil)
     @sourcefile_path = sourcefile_path
     @token = sourcefile_path
   end
 
+  # Override from `Hbc::DSL` because `@token` is set to the constructor argument
+  # instead of `self.class.token` as in `Hbc::Cask`.
+  def caskroom_path
+    Hbc.caskroom.join(token)
+  end
+
+  # Override from `Hbc::DSL` because we don't have a cask source file to work
+  # with, so we don't know the cask's `version`.
+  def staged_path
+    caskroom_path.children.first
+  end
+
   def to_s
     "#{token} (!)"
   end