class Haml::AttributeCompiler

def compile_boolean!(temple, key, values)
  exp = literal_for(values.last)
  if Temple::StaticAnalyzer.static?(exp)
    value = eval(exp)
    case value
    when true then temple << [:html, :attr, key, @format == :xhtml ? [:static, key] : [:multi]]
    when false, nil
    else temple << [:html, :attr, key, [:fescape, @escape_attrs, [:static, value.to_s]]]
    end
  else
    var = @identity.generate
    temple << [
      :case, "(#{var} = (#{exp}))",
      ['true', [:html, :attr, key, @format == :xhtml ? [:static, key] : [:multi]]],
      ['false, nil', [:multi]],
      [:else, [:multi, [:static, " #{key}=#{@quote}"], [:fescape, @escape_attrs, [:dynamic, var]], [:static, @quote]]],
    ]
  end
end