Optimize the wptexturize() loop:

* Take the ampersand pattern out of the loop for speed.
* Fix old bugs in the ampersand pattern.
* Refactor `_wptexturize_pushpop_element()` without PCRE for speed.
* Update unit tests.

Props miqrogroove.
Fixes #28623.


git-svn-id: https://develop.svn.wordpress.org/trunk@28831 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/formatting/WPTexturize.php

@@ -829,9 +829,17 @@ class Tests_Formatting_WPTexturize extends WP_UnitTestCase {
 				"word & word",
 				"word & word",
 			),
+			array(
+				"word ઼ word",
+				"word ઼ word",
+			),
+			array(
+				"word Δ word",
+				"word Δ word",
+			),
 			array(
 				"word &# word",
-				"word &# word", // invalid output?
+				"word &# word",
 			),
 			array(
 				"word &44; word",
@@ -839,11 +847,19 @@ class Tests_Formatting_WPTexturize extends WP_UnitTestCase {
 			),
 			array(
 				"word && word",
-				"word && word",
+				"word && word",
 			),
 			array(
 				"word &!amp; word",
-				"word &!amp; word",
+				"word &!amp; word",
+			),
+			array(
+				"word &#",
+				"word &#",
+			),
+			array(
+				"word &",
+				"word &",
 			),
 		);
 	}
@@ -1285,6 +1301,10 @@ class Tests_Formatting_WPTexturize extends WP_UnitTestCase {
 				'<ul><li>Hello.</li><!--<li>Goodbye.</li>--></ul>',
 				'<ul><li>Hello.</li><!--<li>Goodbye.</li>--></ul>',
 			),
+			array(
+				'word <img src="http://example.com/wp-content/uploads/2014/06/image-300x216.gif" /> word', // Ensure we are not corrupting image URLs.
+				'word <img src="http://example.com/wp-content/uploads/2014/06/image-300x216.gif" /> word',
+			),
 		);
 	}