class Kramdown::Parser::Kramdown

def parse_extension_block_depr
  @src.pos += @src.matched_size
  ext = @src[1]
  opts = {}
  body = nil
  parse_attribute_list(@src[3], opts)
  warn('DEPRECATION warning: This syntax is deprecated, use the new extension syntax')
  if !%w{comment nomarkdown options}.include?(ext)
    warn('DEPRECATION warning: Custom extensions will be removed in a future version - use a template processor like ERB instead')
  end
  if !@extension.public_methods.map {|m| m.to_s}.include?("parse_#{ext}")
    warning("No extension named '#{ext}' found - ignoring extension block")
    body = :invalid
  end
  if !@src[2]
    stop_re = /#{EXT_BLOCK_START_STR_DEPR % ext}/
    if result = @src.scan_until(stop_re)
      parse_attribute_list(@src[3], opts)
      body = result.sub!(stop_re, '') if body != :invalid
    else
      body = :invalid
      warning("No ending line for extension block '#{ext}' found - ignoring extension block")
    end
  end
  @extension.send("parse_#{ext}", self, opts, body) if body != :invalid
  true
end