erubi.rb in tilt-2.1.0

- old
+ new

@@ -14,10 +14,28 @@
     def prepare
       @options.merge!(:preamble => false, :postamble => false, :ensure=>true)
 
       engine_class = @options[:engine_class] || Erubi::Engine
 
+      # If :freeze option is given, the intent is to setup frozen string
+      # literals in the template.  So enable frozen string literals in the
+      # code Tilt generates if the :freeze option is given.
+      if @freeze_string_literals = !!@options[:freeze]
+        # Passing the :freeze option to Erubi sets the
+        # frozen-string-literal magic comment, which doesn't have an effect
+        # with Tilt as Tilt wraps the resulting code.  Worse, the magic
+        # comment appearing not at the top of the file can cause a warning.
+        # So remove the :freeze option before passing to Erubi.
+        @options.delete(:freeze)
+
+        # Erubi by default appends .freeze to template literals on Ruby 2.1+,
+        # but that is not necessary and slows down code when Tilt is using
+        # frozen string literals, so pass the :freeze_template_literals
+        # option to not append .freeze.
+        @options[:freeze_template_literals] = false
+      end
+
       @engine = engine_class.new(data, @options)
       @outvar = @engine.bufvar
 
       # Remove dup after tilt supports frozen source.
       @src = @engine.src.dup
@@ -25,8 +43,12 @@
       @engine
     end
 
     def precompiled_template(locals)
       @src
+    end
+
+    def freeze_string_literals?
+      @freeze_string_literals
     end
   end
 end