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require 'active_support/core_ext/class/attribute_accessors'
require 'active_support/core_ext/string/output_safety'
require "action_view/template"
require 'erubis'
module ActionView
class OutputBuffer < ActiveSupport::SafeBuffer
def initialize(*)
super
encode!
end
def <<(value)
super(value.to_s)
end
alias :append= :<<
def append_if_string=(value)
if value.is_a?(String) && !value.is_a?(NonConcattingString)
ActiveSupport::Deprecation.warn("<% %> style block helpers are deprecated. Please use <%= %>", caller)
self << value
end
end
end
class Template
module Handlers
class Erubis < ::Erubis::Eruby
def add_preamble(src)
src << "@output_buffer = ActionView::OutputBuffer.new;"
end
def add_text(src, text)
return if text.empty?
src << "@output_buffer.safe_concat('" << escape_text(text) << "');"
end
BLOCK_EXPR = /\s+(do|\{)(\s*\|[^|]*\|)?\s*\Z/
def add_expr_literal(src, code)
if code =~ BLOCK_EXPR
src << '@output_buffer.append= ' << code
else
src << '@output_buffer.append= (' << code << ');'
end
end
def add_stmt(src, code)
if code =~ BLOCK_EXPR
src << '@output_buffer.append_if_string= ' << code
else
super
end
end
def add_expr_escaped(src, code)
src << '@output_buffer.append= ' << escaped_expr(code) << ';'
end
def add_postamble(src)
src << '@output_buffer.to_s'
end
end
class ERB < Handler
include Compilable
##
# :singleton-method:
# Specify trim mode for the ERB compiler. Defaults to '-'.
# See ERb documentation for suitable values.
cattr_accessor :erb_trim_mode
self.erb_trim_mode = '-'
self.default_format = Mime::HTML
cattr_accessor :erb_implementation
self.erb_implementation = Erubis
ENCODING_TAG = Regexp.new("\\A(<%#{ENCODING_FLAG}-?%>)[ \\t]*")
def self.accepts_binary?
true
end
def compile(template)
if template.source.encoding_aware?
# Even though Rails has given us a String tagged with the
# default_internal encoding (likely UTF-8), it is possible
# that the String is actually encoded using a different
# encoding, specified via an ERB magic comment. If the
# String is not actually UTF-8, the regular expression
# engine will (correctly) raise an exception. For now,
# we'll reset the String to BINARY so we can run regular
# expressions against it
template_source = template.source.dup.force_encoding("BINARY")
# Erubis does not have direct support for encodings.
# As a result, we will extract the ERB-style magic
# comment, give the String to Erubis as BINARY data,
# and then tag the resulting String with the extracted
# encoding later
erb = template_source.gsub(ENCODING_TAG, '')
encoding = $2
if !encoding && (template.source.encoding == Encoding::BINARY)
raise WrongEncodingError.new(template_source, Encoding.default_external)
end
end
result = self.class.erb_implementation.new(
erb,
:trim => (self.class.erb_trim_mode == "-")
).src
# If an encoding tag was found, tag the String
# we're returning with that encoding. Otherwise,
# return a BINARY String, which is what ERB
# returns. Note that if a magic comment was
# not specified, we will return the data to
# Rails as BINARY, which will then use its
# own encoding logic to create a UTF-8 String.
result = "\n#{result}".force_encoding(encoding).encode if encoding
result
end
end
end
end
end
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