diff --git a/lib/haml.rb b/lib/haml.rb
index a0a6a509..15be8e98 100644
--- a/lib/haml.rb
+++ b/lib/haml.rb
@@ -1044,4 +1044,5 @@ module Haml
   end
 end
 
+require 'haml/util'
 require 'haml/engine'
diff --git a/lib/haml/buffer.rb b/lib/haml/buffer.rb
index cd6d1a00..7ca63401 100644
--- a/lib/haml/buffer.rb
+++ b/lib/haml/buffer.rb
@@ -5,6 +5,7 @@ module Haml
   # processing done within instance_eval'd code.
   class Buffer
     include Haml::Helpers
+    include Haml::Util
 
     # The string that holds the compiled XHTML. This is aliased as
     # _erbout for compatibility with ERB-specific code.
@@ -152,7 +153,7 @@ module Haml
 
       attributes = class_id
       attributes_hashes.each do |old|
-        self.class.merge_attrs(attributes, old.inject({}) {|h, (key, val)| h[key.to_s] = val; h})
+        self.class.merge_attrs(attributes, to_hash(old.map {|k, v| [k.to_s, v]}))
       end
       self.class.merge_attrs(attributes, parse_object_ref(obj_ref)) if obj_ref
 
diff --git a/lib/haml/html.rb b/lib/haml/html.rb
index d0ee9b32..297d0e29 100644
--- a/lib/haml/html.rb
+++ b/lib/haml/html.rb
@@ -162,19 +162,15 @@ module Haml
       
       def dynamic_attributes
         @dynamic_attributes ||= begin
-          attributes.inject({}) do |dynamic, pair|
-            name, value = pair
-            unless value.empty?
-              full_match = nil
-              ruby_value = value.gsub(%r{<haml:loud>\s*(.+?)\s*</haml:loud>}) do
-                full_match = $`.empty? && $'.empty?
-                full_match ? $1: "\#{#{$1}}"
-              end
-              unless ruby_value == value
-                dynamic[name] = full_match ? ruby_value : %("#{ruby_value}")
-              end
+          Haml::Util.map_hash(attributes) do |name, value|
+            next if value.empty?
+            full_match = nil
+            ruby_value = value.gsub(%r{<haml:loud>\s*(.+?)\s*</haml:loud>}) do
+              full_match = $`.empty? && $'.empty?
+              full_match ? $1: "\#{#{$1}}"
             end
-            dynamic
+            next if ruby_value == value
+            [name, full_match ? ruby_value : %("#{ruby_value}")]
           end
         end
       end
diff --git a/lib/haml/template/patch.rb b/lib/haml/template/patch.rb
index 49f5014e..2fe4867b 100644
--- a/lib/haml/template/patch.rb
+++ b/lib/haml/template/patch.rb
@@ -29,7 +29,7 @@ module ActionView
 
       @@template_args[render_symbol] ||= {}
       locals_keys = @@template_args[render_symbol].keys | locals
-      @@template_args[render_symbol] = locals_keys.inject({}) { |h, k| h[k] = true; h }
+      @@template_args[render_symbol] = to_hash(locals_keys.map {|k| [k, true]})
 
       options = Haml::Template.options.dup
       options[:filename] = file_name || 'compiled-template'
diff --git a/lib/haml/util.rb b/lib/haml/util.rb
new file mode 100644
index 00000000..8d715ea5
--- /dev/null
+++ b/lib/haml/util.rb
@@ -0,0 +1,21 @@
+module Haml
+  module Util
+    class << self; include Haml::Util; end
+
+    def to_hash(arr)
+      arr.compact.inject({}) {|h, (k, v)| h[k] = v; h}
+    end
+
+    def map_keys(hash)
+      to_hash(hash.map {|k, v| [yield(k), v]})
+    end
+
+    def map_vals(hash)
+      to_hash(hash.map {|k, v| [k, yield(v)]})
+    end
+
+    def map_hash(hash, &block)
+      to_hash(hash.map(&block))
+    end
+  end
+end
diff --git a/lib/sass.rb b/lib/sass.rb
index 92d587c0..7462b8f8 100644
--- a/lib/sass.rb
+++ b/lib/sass.rb
@@ -968,5 +968,6 @@ $LOAD_PATH.unshift dir unless $LOAD_PATH.include?(dir)
 #
 module Sass; end
 
+require 'haml/util'
 require 'sass/engine'
 require 'sass/plugin' if defined?(Merb::Plugins)
diff --git a/lib/sass/script/color.rb b/lib/sass/script/color.rb
index 1652b84d..96df7e86 100644
--- a/lib/sass/script/color.rb
+++ b/lib/sass/script/color.rb
@@ -2,25 +2,24 @@ require 'sass/script/literal'
 
 module Sass::Script
   class Color < Literal # :nodoc:
-
     HTML4_COLORS = {
-      'black'   => 0x000000,
-      'silver'  => 0xc0c0c0,
-      'gray'    => 0x808080,
-      'white'   => 0xffffff,
-      'maroon'  => 0x800000,
-      'red'     => 0xff0000,
-      'purple'  => 0x800080,
-      'fuchsia' => 0xff00ff,
-      'green'   => 0x008000,
-      'lime'    => 0x00ff00,
-      'olive'   => 0x808000,
-      'yellow'  => 0xffff00,
-      'navy'    => 0x000080,
-      'blue'    => 0x0000ff,
-      'teal'    => 0x008080,
-      'aqua'    => 0x00ffff
-    }
+        'black'   => 0x000000,
+        'silver'  => 0xc0c0c0,
+        'gray'    => 0x808080,
+        'white'   => 0xffffff,
+        'maroon'  => 0x800000,
+        'red'     => 0xff0000,
+        'purple'  => 0x800080,
+        'fuchsia' => 0xff00ff,
+        'green'   => 0x008000,
+        'lime'    => 0x00ff00,
+        'olive'   => 0x808000,
+        'yellow'  => 0xffff00,
+        'navy'    => 0x000080,
+        'blue'    => 0x0000ff,
+        'teal'    => 0x008080,
+        'aqua'    => 0x00ffff
+      }
 
     def initialize(rgb)
       rgb = rgb.map {|c| c.to_i}