Unicode control characters in inputs may break generation of documents about sablon

[tagliala]

At the moment we are using the following monkey patch:

# frozen_string_literal: true

# TODO: Remove when senny/sablon#192 is fixed
Sablon::Statement.send(:remove_const, :Insertion)

module Sablon
  module Statement
    class Insertion < Struct.new(:expr, :field)
      RESERVED_CHARS = ((1..31).map { |c| c.chr(Encoding::UTF_8) } - ["\t", "\n", "\r"]).join.freeze
      REPLACING_CHAR = ''

      def evaluate(env)
        if (content = expr.evaluate(env.context))
          sanitized_content = sanitize(content)
          field.replace(Sablon::Content.wrap(sanitized_content), env)
        else
          field.remove
        end
      end

      def sanitize(content)
        return content unless content.respond_to?(:tr)

        content.tr(RESERVED_CHARS, REPLACING_CHAR)
      end
    end
  end
end

If there is a better place please advise