def summary
resolve_reference
return @summary if @summary
stripped = self.gsub(/<.+?>/m, '').gsub(/[\r\n](?![\r\n])/, ' ').strip
open_parens = ['{', '(', '[']
close_parens = ['}', ')', ']']
num_parens = 0
idx = length.times do |index|
case stripped[index, 1]
when ".", "\r", "\n"
next_char = stripped[index + 1, 1].to_s
if num_parens == 0 && next_char =~ /^\s*$/
break index - 1
end
when "{", "(", "["
num_parens += 1
when "}", ")", "]"
num_parens -= 1
end
end
@summary = stripped[0..idx]
if !@summary.empty? && @summary !~ /\A\s*\{include:.+\}\s*\Z/
@summary += '.'
end
@summary
end