module ActionView class Template module Handlers autoload :Erubis, "action_view/template/handlers/erb/deprecated_erubis" class ERB autoload :Erubi, "action_view/template/handlers/erb/erubi" autoload :Erubis, "action_view/template/handlers/erb/erubis" # Specify trim mode for the ERB compiler. Defaults to '-'. # See ERB documentation for suitable values. class_attribute :erb_trim_mode, default: "-" # Default implementation used. class_attribute :erb_implementation, default: Erubi # Do not escape templates of these mime types. class_attribute :escape_whitelist, default: ["text/plain"] ENCODING_TAG = Regexp.new("\\A(<%#{ENCODING_FLAG}-?%>)[ \\t]*") def self.call(template) new.call(template) end def supports_streaming? true end def handles_encoding? true end 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 private 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 end end end end