Check the full CSS selector to see if it's valid to allow numeric selectors when manually calling sprite methods

frameworks/compass/stylesheets/compass/utilities/sprites/_base.scss

@@ -40,11 +40,13 @@ $disable-magic-sprite-selectors:false !default;
 @mixin sprite-selectors($map, $sprite-name, $full-sprite-name, $offset-x: 0, $offset-y: 0) {
   @each $selector in $sprite-selectors {
     @if sprite_has_selector($map, $sprite-name, $selector) {
+      @if sprite_has_valid_selector("#{$full-sprite-name}-#{$selector}") {
         &:#{$selector}, &.#{$full-sprite-name}_#{$selector}, &.#{$full-sprite-name}-#{$selector} {
             @include sprite-background-position($map, "#{$sprite-name}_#{$selector}", $offset-x, $offset-y);
         }
       }
     }
+  }
 }
 
 // Generates a class for each space separated name in `$sprite-names`.
@@ -57,10 +59,12 @@ $disable-magic-sprite-selectors:false !default;
   @each $sprite-name in $sprite-names {
     @if sprite_does_not_have_parent($map, $sprite-name) {
       $full-sprite-name: "#{$prefix}-#{$sprite-name}";
+      @if sprite_has_valid_selector($full-sprite-name) {
         .#{$full-sprite-name} {
           @if $base-class { @extend #{$base-class}; }
           @include sprite($map, $sprite-name, $dimensions, $offset-x, $offset-y);
         }
       }
     }
+  }
 }

lib/compass/sass_extensions/functions/sprites.rb

@@ -60,9 +60,7 @@ module Compass::SassExtensions::Functions::Sprites
   def sprite(map, sprite, offset_x = ZERO, offset_y = ZERO)
     sprite = convert_sprite_name(sprite)    
     verify_map(map)
-    unless sprite.is_a?(Sass::Script::String)
-      raise Sass::SyntaxError, %Q(The second argument to sprite() must be a sprite name. See http://beta.compass-style.org/help/tutorials/spriting/ for more information.)
-    end
+    verify_sprite(sprite)
     url = sprite_url(map)
     position = sprite_position(map, sprite, offset_x, offset_y)
     Sass::Script::List.new([url] + position.value, :space)
@@ -115,6 +113,13 @@ module Compass::SassExtensions::Functions::Sprites
   
   Sass::Script::Functions.declare :sprite_has_selector, [:map, :sprite, :selector]
 
+  # Determines if the CSS selector is valid
+  def sprite_has_valid_selector(selector)
+    unless selector.value =~ /\A#{Sass::SCSS::RX::IDENT}\Z/
+      raise Sass::SyntaxError, "#{selector} must be a legal css identifier"
+    end
+    Sass::Script::Bool.new true
+  end
 
   # Returns a url to the sprite image.
   def sprite_url(map)
@@ -148,7 +153,7 @@ module Compass::SassExtensions::Functions::Sprites
     assert_type offset_y, :Number
     sprite = convert_sprite_name(sprite)
     verify_map(map, "sprite-position")
-    unless sprite && sprite.is_a?(Sass::Script::String)
+    unless sprite.is_a?(Sass::Script::String) || sprite.is_a?(Sass::Script::Number)
       raise Sass::SyntaxError, %Q(The second argument to sprite-position must be a sprite name. See http://beta.compass-style.org/help/tutorials/spriting/ for more information.)
     end
     image = map.image_for(sprite.value)
@@ -194,7 +199,7 @@ protected
   end
 
   def verify_sprite(sprite)
-    unless sprite.is_a?(Sass::Script::String)
+    unless sprite.is_a?(Sass::Script::String) || sprite.is_a?(Sass::Script::Number)
       raise Sass::SyntaxError, %Q(The second argument to sprite() must be a sprite name. See http://beta.compass-style.org/help/tutorials/spriting/ for more information.)
     end
   end

lib/compass/sass_extensions/sprites/image_methods.rb

@@ -4,6 +4,7 @@ module Compass
       module ImageMethods
         # Fetches the Sprite::Image object for the supplied name
          def image_for(name)
+           name = name.to_s
            @images.detect { |img| img.name == name}
          end
 

lib/compass/sass_extensions/sprites/sprite_map.rb

@@ -44,7 +44,6 @@ module Compass
           @height = nil
           @engine = nil
           @evaluation_context = context
-          validate!
           compute_image_metadata!
         end
 

lib/compass/sass_extensions/sprites/sprite_methods.rb

@@ -31,15 +31,6 @@ module Compass
           end
         end
 
-        # Validates that the sprite_names are valid sass
-        def validate!
-          for sprite_name in sprite_names
-            unless sprite_name =~ /\A#{Sass::SCSS::RX::IDENT}\Z/
-              raise Sass::SyntaxError, "#{sprite_name} must be a legal css identifier"
-            end
-          end
-        end
-        
         def name_and_hash
           "#{path}-s#{uniqueness_hash}.png"
         end

lib/compass/sprite_importer.rb

@@ -87,11 +87,7 @@ module Compass
     # Returns an Array of image names without the file extension
     def self.sprite_names(uri)
       files(uri).collect do |file|
-        filename = File.basename(file, '.png')
-        unless VAILD_FILE_NAME =~ filename
-          raise Compass::Error, "Sprite file names must be legal css identifiers. Please rename #{File.basename(file)}"
-        end
-        filename
+        File.basename(file, '.png')
       end
     end