Reorder repository to allow for custom selector engines to be included instead of Sizzle (the current default). Selector engines belong in the vendor directory and must have a selector_engine.js file. To build a Prototype with your engine of choice just spepcify it at build time using the SELECTOR_ENGINE option. For example, to build a version with NSMatcher: rake dist SELECTOR_ENGINE=nwmatcher.

.gitmodules

@@ -11,6 +11,6 @@
   path = vendor/sprockets
   url = git://github.com/sstephenson/sprockets.git
 
-[submodule "vendor/sizzle"]
-	path = vendor/sizzle
+[submodule "vendor/sizzle/sizzle"]
+	path = vendor/sizzle/sizzle
 	url = git://github.com/jeresig/sizzle.git

Rakefile

@@ -42,7 +42,7 @@ module PrototypeHelper
     require_sizzle
     secretary = Sprockets::Secretary.new(
       :root           => File.join(ROOT_DIR, path),
-      :load_path      => [SRC_DIR, SIZZLE_DIR],
+      :load_path      => self.load_path,
       :source_files   => [source],
       :strip_comments => strip_comments
     )
@@ -51,6 +51,18 @@ module PrototypeHelper
     secretary.concatenation.save_to(destination)
   end
   
+  def self.load_path
+    selector = ENV['SELECTOR_ENGINE'] || 'sizzle'
+    selector_path = File.join(ROOT_DIR, 'vendor', selector)
+    if File.exists?(selector_path)
+      [SRC_DIR, selector_path]
+    else
+      puts "\nYou seem to be missing vendor/#{selector}."
+      puts "Built Prototype using Sizzle instead.\n\n"
+      [SRC_DIR, SIZZLE_DIR]
+    end
+  end
+  
   def self.build_doc_for(file)
     mkdir_p TMP_DIR
     temp_path = File.join(TMP_DIR, "prototype.temp.js")
@@ -83,8 +95,8 @@ module PrototypeHelper
   end
   
   def self.require_sizzle
-    if !File.exists?(File.join(SIZZLE_DIR, 'sizzle.js'))
-      exit unless get_submodule("Sizzle", "sizzle")
+    if !File.exists?(File.join(SIZZLE_DIR, 'sizzle', 'sizzle.js'))
+      exit unless get_submodule("Sizzle", "sizzle/sizzle")
     end
   end
   

src/dom.js

@@ -21,7 +21,7 @@
 
 
 //= require "dom/dom"
-//= require "dom/sizzle_adapter"
+//= require <selector_engine>
 //= require "dom/selector"
 //= require "dom/form"
 //= require "dom/event"

vendor/nwmatcher/selector_engine.js

@@ -0,0 +1,37 @@
+Prototype._original_nw = window.NW;
+//= require <nwmatcher-1.1.1>
+Prototype.NW = window.NW;
+
+// Restore globals.
+window.NW = Prototype._original_nw;
+delete Prototype._original_nw;
+
+Prototype.Selector = (function(NW) {
+  function extend(elements) {
+    for (var i = 0, length = elements.length; i < length; i++)
+      elements[i] = Element.extend(elements[i]);
+    return elements;
+  }
+  
+  function select(selector, scope) {
+    return extend(NW.select(selector, scope || document));
+  }
+
+  function filter(elements, selector) {
+    var results = [], element;
+    for (var i = 0, length = elements.length; i < length; i++) {
+      element = elements[i];
+      if (NW.match(element, selector)) {
+        results.push(Element.extend(element))
+      }
+    }
+    return results;
+  }
+  
+  return {
+    select: select,
+    match:  NW.match,
+    filter: filter
+  };
+})(Prototype.NW.Dom);
+

vendor/sizzle

@@ -1 +0,0 @@
-Subproject commit e0f5cbc75d12aa78f3ef30930414b2f88da7b2b8

vendor/sizzle/selector_engine.js

@@ -1,5 +1,5 @@
 Prototype._original_sizzle = window.Sizzle;
-//= require <sizzle>
+//= require <sizzle/sizzle>
 Prototype.Sizzle = window.Sizzle;
 
 // Restore globals.

vendor/sizzle/sizzle

@@ -0,0 +1 @@
+Subproject commit 415e466f70e5a53f589161b1f2944e5485007409