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# frozen_string_literal: true
module ActionView
class Template
module Handlers
class ERB
autoload :Erubi, "action_view/template/handlers/erb/erubi"
# 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_ignore_list, default: ["text/plain"]
[self, singleton_class].each do |base|
base.send(:alias_method, :escape_whitelist, :escape_ignore_list)
base.send(:alias_method, :escape_whitelist=, :escape_ignore_list=)
base.deprecate(
escape_whitelist: "use #escape_ignore_list instead",
:escape_whitelist= => "use #escape_ignore_list= instead"
)
end
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_ignore_list.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
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