Implement EntityLookup and put in the Lexer. Some behavior was migrated, since it looks like it will have to be used in all Lexers, not just DirectLex (which is the only one that uses it).

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@105 48356398-32a2-884e-a903-53898d9a118a

library/HTMLPurifier/EntityLookup.php

@@ -0,0 +1,25 @@
+<?php
+
+class HTMLPurifier_EntityLookup {
+    
+    var $table;
+    
+    function HTMLPurifier_EntityLookup($file = false) {
+        if (!$file) {
+            $file = dirname(__FILE__) . '/EntityLookup/data.txt';
+        }
+        $this->table = unserialize(file_get_contents($file));
+    }
+    
+    function instance() {
+        // no references, since PHP doesn't copy unless modified
+        static $instance = null;
+        if (!$instance) {
+            $instance = new HTMLPurifier_EntityLookup();
+        }
+        return $instance;
+    }
+    
+}
+
+?>