tag_options creates fewer objects

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7512 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionpack/lib/action_view/helpers/tag_helper.rb

@@ -8,6 +8,8 @@ module ActionView
     module TagHelper
       include ERB::Util
 
+      BOOLEAN_ATTRIBUTES = Set.new(%w(disabled readonly multiple))
+
       # Returns an empty HTML tag of type +name+ which by default is XHTML 
       # compliant. Setting +open+ to true will create an open tag compatible 
       # with HTML 4.0 and below. Add HTML attributes by passing an attributes 
@@ -97,29 +99,28 @@ module ActionView
 
       private
         def content_tag_string(name, content, options)
-          tag_options = options ? tag_options(options) : ""
+          tag_options = tag_options(options) if options
           "<#{name}#{tag_options}>#{content}</#{name}>"
         end
-      
+
         def tag_options(options)
-          cleaned_options = convert_booleans(options.stringify_keys.reject {|key, value| value.nil?})
-          ' ' + cleaned_options.map {|key, value| %(#{key}="#{escape_once(value)}")}.sort * ' ' unless cleaned_options.empty?
+          unless options.blank?
+            attrs = []
+            options.each do |key, value|
+              next unless value
+              key = key.to_s
+              value = BOOLEAN_ATTRIBUTES.include?(key) ? key : escape_once(value)
+              attrs << %(#{key}="#{value}")
+            end
+            " #{attrs.sort * ' '}" unless attrs.empty?
+          end
         end
 
-        def convert_booleans(options)
-          %w( disabled readonly multiple ).each { |a| boolean_attribute(options, a) }
-          options
-        end
-
-        def boolean_attribute(options, attribute)
-          options[attribute] ? options[attribute] = attribute : options.delete(attribute)
-        end
-        
         # Fix double-escaped entities, such as &amp;amp;, &amp;#123;, etc.
         def fix_double_escape(escaped)
           escaped.gsub(/&amp;([a-z]+|(#\d+));/i) { "&#{$1};" }
         end
-        
+
         def block_is_within_action_view?(block)
           eval("defined? _erbout", block.binding)
         end

actionpack/test/template/tag_helper_test.rb

@@ -13,7 +13,9 @@ class TagHelperTest < Test::Unit::TestCase
   end
 
   def test_tag_options
-    assert_match /\A<p class="(show|elsewhere)" \/>\z/, tag("p", "class" => "show", :class => "elsewhere")
+    str = tag("p", "class" => "show", :class => "elsewhere")
+    assert_match /class="show"/, str
+    assert_match /class="elsewhere"/, str
   end
 
   def test_tag_options_rejects_nil_option