instance method compile

# File actionview/lib/action_view/template.rb, line 275
      def compile(mod)
        source = encode!
        code = @handler.call(self, source)

        # Make sure that the resulting String to be eval'd is in the
        # encoding of the code
        original_source = source
        source = +<<-end_src
          def #{method_name}(local_assigns, output_buffer, &_)
            @virtual_path = #{@virtual_path.inspect};#{locals_code};#{code}
          end
        end_src

        # Make sure the source is in the encoding of the returned code
        source.force_encoding(code.encoding)

        # In case we get back a String from a handler that is not in
        # BINARY or the default_internal, encode it to the default_internal
        source.encode!

        # Now, validate that the source we got back from the template
        # handler is valid in the default_internal. This is for handlers
        # that handle encoding but screw up
        unless source.valid_encoding?
          raise WrongEncodingError.new(source, Encoding.default_internal)
        end

        begin
          if Template.frozen_string_literal
            mod.module_eval("# frozen_string_literal: true\n#{source}", identifier, -1)
          else
            mod.module_eval(source, identifier, 0)
          end
        rescue SyntaxError
          # Account for when code in the template is not syntactically valid; e.g. if we're using
          # ERB and the user writes <%= foo( %>, attempting to call a helper `foo` and interpolate
          # the result into the template, but missing an end parenthesis.
          raise SyntaxErrorInTemplate.new(self, original_source)
        end
      end