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diff --git a/vendor/ezyang/htmlpurifier/maintenance/generate-entity-file.php b/vendor/ezyang/htmlpurifier/maintenance/generate-entity-file.php
new file mode 100755
index 000000000..ff1713e39
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/maintenance/generate-entity-file.php
@@ -0,0 +1,75 @@
+#!/usr/bin/php
+<?php
+
+chdir(dirname(__FILE__));
+require_once 'common.php';
+assertCli();
+
+/**
+ * @file
+ * Parses *.ent files into an entity lookup table, and then serializes and
+ * writes the whole kaboodle to a file. The resulting file is cached so
+ * that this script does not need to be run. This script should rarely,
+ * if ever, be run, since HTML's entities are fairly immutable.
+ */
+
+// here's where the entity files are located, assuming working directory
+// is the same as the location of this PHP file. Needs trailing slash.
+$entity_dir = '../docs/entities/';
+
+// defines the output file for the serialized content.
+$output_file = '../library/HTMLPurifier/EntityLookup/entities.ser';
+
+// courtesy of a PHP manual comment
+function unichr($dec)
+{
+    if ($dec < 128) {
+        $utf  = chr($dec);
+    } elseif ($dec < 2048) {
+        $utf  = chr(192 + (($dec - ($dec % 64)) / 64));
+        $utf .= chr(128 + ($dec % 64));
+    } else {
+        $utf  = chr(224 + (($dec - ($dec % 4096)) / 4096));
+        $utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64));
+        $utf .= chr(128 + ($dec % 64));
+    }
+    return $utf;
+}
+
+if ( !is_dir($entity_dir) ) exit("Fatal Error: Can't find entity directory.\n");
+if ( file_exists($output_file) ) exit("Fatal Error: output file already exists.\n");
+
+$dh = @opendir($entity_dir);
+if ( !$dh ) exit("Fatal Error: Cannot read entity directory.\n");
+
+$entity_files = array();
+while (($file = readdir($dh)) !== false) {
+    if (@$file[0] === '.') continue;
+    if (substr(strrchr($file, "."), 1) !== 'ent') continue;
+    $entity_files[] = $file;
+}
+closedir($dh);
+
+if ( !$entity_files ) exit("Fatal Error: No entity files to parse.\n");
+
+$entity_table = array();
+$regexp = '/<!ENTITY\s+([A-Za-z0-9]+)\s+"&#(?:38;#)?([0-9]+);">/';
+
+foreach ( $entity_files as $file ) {
+    $contents = file_get_contents($entity_dir . $file);
+    $matches = array();
+    preg_match_all($regexp, $contents, $matches, PREG_SET_ORDER);
+    foreach ($matches as $match) {
+        $entity_table[$match[1]] = unichr($match[2]);
+    }
+}
+
+$output = serialize($entity_table);
+
+$fh = fopen($output_file, 'w');
+fwrite($fh, $output);
+fclose($fh);
+
+echo "Completed successfully.";
+
+// vim: et sw=4 sts=4