module Haml::Precompiler

def self.build_attributes(is_html, attr_wrapper, attributes = {})
  quote_escape = attr_wrapper == '"' ? """ : "'"
  other_quote_char = attr_wrapper == '"' ? "'" : '"'
  result = attributes.collect do |attr, value|
    next if value.nil?
    if value == true
      next " #{attr}" if is_html
      next " #{attr}=#{attr_wrapper}#{attr}#{attr_wrapper}"
    elsif value == false
      next
    end
    value = Haml::Helpers.preserve(Haml::Helpers.escape_once(value.to_s))
    # We want to decide whether or not to escape quotes
    value.gsub!('"', '"')
    this_attr_wrapper = attr_wrapper
    if value.include? attr_wrapper
      if value.include? other_quote_char
        value = value.gsub(attr_wrapper, quote_escape)
      else
        this_attr_wrapper = other_quote_char
      end
    end
    " #{attr}=#{this_attr_wrapper}#{value}#{this_attr_wrapper}"
  end
  result.compact.sort.join
end