instance method call

# File actionview/lib/action_view/template/handlers/erb.rb, line 33
        def call(template)
          # First, convert to BINARY, so in case the encoding is
          # wrong, we can still find an encoding tag
          # (<%# encoding %>) inside the String using a regular
          # expression
          template_source = template.source.dup.force_encoding(Encoding::ASCII_8BIT)

          erb = template_source.gsub(ENCODING_TAG, "")
          encoding = $2

          erb.force_encoding valid_encoding(template.source.dup, encoding)

          # Always make sure we return a String in the default_internal
          erb.encode!

          self.class.erb_implementation.new(
            erb,
            escape: (self.class.escape_whitelist.include? template.type),
            trim: (self.class.erb_trim_mode == "-")
          ).src
        end