class ActionView::Template::Handlers::ERB

def self.call(template, source)
  new.call(template, source)
end

def call(template, source)
  # 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 = source.b
  erb = template_source.gsub(ENCODING_TAG, "")
  encoding = $2
  erb.force_encoding valid_encoding(source.dup, encoding)
  # Always make sure we return a String in the default_internal
  erb.encode!
  # Strip trailing newlines from the template if enabled
  erb.chomp! if strip_trailing_newlines
  options = {
    escape: (self.class.escape_ignore_list.include? template.type),
    trim: (self.class.erb_trim_mode == "-")
  }
  if ActionView::Base.annotate_rendered_view_with_filenames && template.format == :html
    options[:preamble] = "@output_buffer.safe_append='<!-- BEGIN #{template.short_identifier} -->';"
    options[:postamble] = "@output_buffer.safe_append='<!-- END #{template.short_identifier} -->';@output_buffer.to_s"
  end
  self.class.erb_implementation.new(erb, options).src
end

def handles_encoding?
  true
end

def supports_streaming?
  true
end

def valid_encoding(string, encoding)
  # If a magic encoding comment was found, tag the
  # String with this encoding. This is for a case
  # where the original String was assumed to be,
  # for instance, UTF-8, but a magic comment
  # proved otherwise
  string.force_encoding(encoding) if encoding
  # If the String is valid, return the encoding we found
  return string.encoding if string.valid_encoding?
  # Otherwise, raise an exception
  raise WrongEncodingError.new(string, string.encoding)
end