diff --git a/Library/Homebrew/cask/lib/hbc/cask_loader.rb b/Library/Homebrew/cask/lib/hbc/cask_loader.rb
new file mode 100644
index 0000000000..3875b30df2
--- /dev/null
+++ b/Library/Homebrew/cask/lib/hbc/cask_loader.rb
@@ -0,0 +1,54 @@
+module Hbc
+  class CaskLoader
+    def self.load_from_file(path)
+      raise CaskError, "File '#{path}' does not exist"      unless path.exist?
+      raise CaskError, "File '#{path}' is not readable"     unless path.readable?
+      raise CaskError, "File '#{path}' is not a plain file" unless path.file?
+
+      token = path.basename(".rb").to_s
+      content = IO.read(path).force_encoding("UTF-8")
+
+      new(token, content, path).load
+    end
+
+    def self.load_from_string(token, content)
+      new(token, content).load
+    end
+
+    def load
+      instance_eval(@content, __FILE__, __LINE__)
+    rescue CaskError, StandardError, ScriptError => e
+      e.message.concat(" while loading '#{@token}'")
+      e.message.concat(" from '#{@path}'") unless @path.nil?
+      raise e, e.message
+    end
+
+    private
+
+    def initialize(token, content, path = nil)
+      @token = token
+      @content = content
+      @path = path unless path.nil?
+    end
+
+    def cask(header_token, &block)
+      @klass = Cask
+      build_cask(header_token, &block)
+    end
+
+    def test_cask(header_token, &block)
+      @klass = TestCask
+      build_cask(header_token, &block)
+    end
+
+    def build_cask(header_token, &block)
+      raise CaskTokenDoesNotMatchError.new(@token, header_token) unless @token == header_token
+
+      if @path.nil?
+        @klass.new(@token, &block)
+      else
+        @klass.new(@token, sourcefile_path: @path, &block)
+      end
+    end
+  end
+end
diff --git a/Library/Homebrew/cask/lib/hbc/locations.rb b/Library/Homebrew/cask/lib/hbc/locations.rb
index 32c95413cd..c763b974b4 100644
--- a/Library/Homebrew/cask/lib/hbc/locations.rb
+++ b/Library/Homebrew/cask/lib/hbc/locations.rb
@@ -131,21 +131,32 @@ module Hbc
       end
 
       def path(query)
-        query = query.sub(%r{\.rb$}i, "")
-        token_with_tap = if query.include?("/")
-                           query
+        query_path = Pathname.new(query)
+
+        if query_path.exist? || query_path.absolute?
+          return query_path
+        end
+
+        query_without_extension = query.sub(%r{\.rb$}i, "")
+
+        token_with_tap = if query =~ %r{\A[^/]+/[^/]+/[^/]+\Z}
+                           query_without_extension
                          else
-                           all_tokens.detect do |tap_and_token|
-                             tap_and_token.split("/")[2] == query
-                           end
+                           all_tokens.detect { |tap_and_token|
+                             tap_and_token.split("/")[2] == query_without_extension
+                           }
                          end
 
         if token_with_tap
           user, repo, token = token_with_tap.split("/")
-          Tap.fetch(user, repo).cask_dir.join("#{token}.rb")
+          tap = Tap.fetch(user, repo)
         else
-          default_tap.cask_dir.join("#{query}.rb")
+          token = query_without_extension
+          tap = Hbc.default_tap
         end
+
+        return query_path if tap.cask_dir.nil?
+        tap.cask_dir.join("#{token}.rb")
       end
 
       def tcc_db
diff --git a/Library/Homebrew/cask/lib/hbc/qualified_token.rb b/Library/Homebrew/cask/lib/hbc/qualified_token.rb
index b9329eeb73..adf22b533e 100644
--- a/Library/Homebrew/cask/lib/hbc/qualified_token.rb
+++ b/Library/Homebrew/cask/lib/hbc/qualified_token.rb
@@ -13,7 +13,7 @@ module Hbc
 
     TAP_REGEX = %r{#{USER_REGEX}[/\-]#{REPO_REGEX}}
 
-    QUALIFIED_TOKEN_REGEX ||= %r{#{TAP_REGEX}/#{TOKEN_REGEX}}
+    QUALIFIED_TOKEN_REGEX = %r{#{TAP_REGEX}/#{TOKEN_REGEX}}
 
     def self.parse(arg)
       return nil unless arg.is_a?(String) && arg.downcase =~ %r{^#{QUALIFIED_TOKEN_REGEX}$}
diff --git a/Library/Homebrew/cask/lib/hbc/source/path_base.rb b/Library/Homebrew/cask/lib/hbc/source/path_base.rb
index 5725380ec5..7d68e518b4 100644
--- a/Library/Homebrew/cask/lib/hbc/source/path_base.rb
+++ b/Library/Homebrew/cask/lib/hbc/source/path_base.rb
@@ -1,4 +1,5 @@
 require "rubygems"
+require "hbc/cask_loader"
 
 module Hbc
   module Source
@@ -6,67 +7,22 @@ module Hbc
       # derived classes must define method self.me?
 
       def self.path_for_query(query)
-        query_string = query.to_s
-        Pathname.new(query_string.end_with?(".rb") ? query_string : query_string + ".rb")
+        Pathname.new(query).sub(%r{(\.rb)?$}, ".rb")
       end
 
       attr_reader :path
 
       def initialize(path)
-        @path = Pathname(path).expand_path
+        @path = Pathname.new(path).expand_path
       end
 
       def load
-        raise CaskError, "File '#{path}' does not exist"      unless path.exist?
-        raise CaskError, "File '#{path}' is not readable"     unless path.readable?
-        raise CaskError, "File '#{path}' is not a plain file" unless path.file?
-        load_cask
+        CaskLoader.load_from_file(@path)
       end
 
       def to_s
         # stringify to fully-resolved location
-        path.to_s
-      end
-
-      private
-
-      def load_cask
-        instance_eval(cask_contents, __FILE__, __LINE__)
-      rescue CaskError, StandardError, ScriptError => e
-        # bug: e.message.concat doesn't work with CaskError exceptions
-        raise e, e.message.concat(" while loading '#{path}'")
-      end
-
-      def cask_contents
-        File.open(path, "rb") do |handle|
-          contents = handle.read
-          if defined?(Encoding)
-            contents.force_encoding("UTF-8")
-          else
-            contents
-          end
-        end
-      end
-
-      def cask(header_token, &block)
-        build_cask(Cask, header_token, &block)
-      end
-
-      def test_cask(header_token, &block)
-        build_cask(TestCask, header_token, &block)
-      end
-
-      def build_cask(cask_class, header_token, &block)
-        if header_token.is_a?(Hash)
-          # Cask file is using old `cask :v1 => 'token'` syntax
-          header_token = header_token.values.first
-        end
-        raise CaskTokenDoesNotMatchError.new(cask_token, header_token) unless cask_token == header_token
-        cask_class.new(cask_token, sourcefile_path: path, &block)
-      end
-
-      def cask_token
-        path.basename.to_s.sub(%r{\.rb}, "")
+        @path.to_s
       end
     end
   end
diff --git a/Library/Homebrew/cask/lib/hbc/source/tapped.rb b/Library/Homebrew/cask/lib/hbc/source/tapped.rb
index 6716e3a351..c1f5f95bca 100644
--- a/Library/Homebrew/cask/lib/hbc/source/tapped.rb
+++ b/Library/Homebrew/cask/lib/hbc/source/tapped.rb
@@ -2,21 +2,7 @@ module Hbc
   module Source
     class Tapped
       def self.me?(query)
-        path_for_query(query).exist?
-      end
-
-      def self.path_for_query(query)
-        # Repeating Hbc.all_tokens is very slow for operations such as
-        # brew cask list, but memoizing the value might cause breakage
-        # elsewhere, given that installation and tap status is permitted
-        # to change during the course of an invocation.
-        token_with_tap = Hbc.all_tokens.find { |t| t.split("/").last == query.sub(%r{\.rb$}i, "") }
-        if token_with_tap
-          user, repo, token = token_with_tap.split("/")
-          Tap.fetch(user, repo).cask_dir.join("#{token}.rb")
-        else
-          Hbc.default_tap.cask_dir.join(query.sub(%r{(\.rb)?$}i, ".rb"))
-        end
+        Hbc.path(query).exist?
       end
 
       attr_reader :token
@@ -26,13 +12,12 @@ module Hbc
       end
 
       def load
-        path = self.class.path_for_query(token)
-        PathSlashOptional.new(path).load
+        PathSlashOptional.new(Hbc.path(token)).load
       end
 
       def to_s
         # stringify to fully-resolved location
-        self.class.path_for_query(token).expand_path.to_s
+        Hbc.path(token).expand_path.to_s
       end
     end
   end
diff --git a/Library/Homebrew/cask/lib/hbc/source/tapped_qualified.rb b/Library/Homebrew/cask/lib/hbc/source/tapped_qualified.rb
index 52191f279a..2db6ddbca5 100644
--- a/Library/Homebrew/cask/lib/hbc/source/tapped_qualified.rb
+++ b/Library/Homebrew/cask/lib/hbc/source/tapped_qualified.rb
@@ -6,7 +6,7 @@ module Hbc
       def self.me?(query)
         return if (tap = tap_for_query(query)).nil?
 
-        tap.installed? && path_for_query(query).exist?
+        tap.installed? && Hbc.path(query).exist?
       end
 
       def self.tap_for_query(query)
@@ -16,11 +16,6 @@ module Hbc
         user, repo = qualified_token[0..1]
         Tap.fetch(user, repo)
       end
-
-      def self.path_for_query(query)
-        user, repo, token = QualifiedToken.parse(query)
-        Tap.fetch(user, repo).cask_dir.join(token.sub(%r{(\.rb)?$}i, ".rb"))
-      end
     end
   end
 end
diff --git a/Library/Homebrew/cask/lib/hbc/source/untapped_qualified.rb b/Library/Homebrew/cask/lib/hbc/source/untapped_qualified.rb
index 6041605d8c..698cc46ce6 100644
--- a/Library/Homebrew/cask/lib/hbc/source/untapped_qualified.rb
+++ b/Library/Homebrew/cask/lib/hbc/source/untapped_qualified.rb
@@ -7,7 +7,7 @@ module Hbc
         return if (tap = tap_for_query(query)).nil?
 
         tap.install
-        tap.installed? && path_for_query(query).exist?
+        tap.installed? && Hbc.path(query).exist?
       end
     end
   end
diff --git a/Library/Homebrew/compat.rb b/Library/Homebrew/compat.rb
index 69b45683a0..db0ece584a 100644
--- a/Library/Homebrew/compat.rb
+++ b/Library/Homebrew/compat.rb
@@ -1,5 +1,6 @@
 require "compat/fails_with_llvm"
 require "compat/tap"
+require "compat/hbc"
 require "compat/formula"
 require "compat/formula_specialties"
 require "compat/global"
diff --git a/Library/Homebrew/compat/hbc.rb b/Library/Homebrew/compat/hbc.rb
new file mode 100644
index 0000000000..a1d1414a59
--- /dev/null
+++ b/Library/Homebrew/compat/hbc.rb
@@ -0,0 +1 @@
+require "compat/hbc/cask_loader"
diff --git a/Library/Homebrew/compat/hbc/cask_loader.rb b/Library/Homebrew/compat/hbc/cask_loader.rb
new file mode 100644
index 0000000000..e7f3a4aac2
--- /dev/null
+++ b/Library/Homebrew/compat/hbc/cask_loader.rb
@@ -0,0 +1,18 @@
+module CaskLoaderCompatibilityLayer
+  private
+
+  def build_cask(header_token, &block)
+    if header_token.is_a?(Hash) && header_token.key?(:v1)
+      odeprecated %q("cask :v1 => 'token'"), %q("cask 'token'")
+      header_token = header_token[:v1]
+    end
+
+    super(header_token, &block)
+  end
+end
+
+module Hbc
+  class CaskLoader
+    prepend CaskLoaderCompatibilityLayer
+  end
+end