From 598c4723cff3781dd08cd830efbb5fa7db21d12f Mon Sep 17 00:00:00 2001
From: saxmatt <saxmatt@1a063a9b-81f0-0310-95a4-ce76da25c4cd>
Date: Fri, 9 Jan 2004 11:16:10 +0000
Subject: [PATCH] Google hilite.

git-svn-id: http://svn.automattic.com/wordpress/trunk@747 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/functions.php | 56 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index e83c9d366..b22ec82fc 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -1661,6 +1661,62 @@ function add_filter($tag, $function_to_add) {
 	return true;
 }
 
+/* Highlighting code c/o Ryan Boren */
+function get_search_query_terms($engine = 'google') {
+	$referer = urldecode($_SERVER[HTTP_REFERER]);
+	$query_array = array();
+	switch ($engine) {
+	case 'google':
+		// Google query parsing code adapted from Dean Allen's
+		// Google Hilite 0.3. http://textism.com
+		$query_terms = preg_replace('/^.*q=([^&]+)&?.*$/i','$1', $referer);
+		$query_terms = preg_replace('/\'|"/','', $query_terms);
+		$query_array = preg_split ("/[\s,\+\.]+/", $query_terms);
+		break;
+	}
+
+	return $query_array;
+}
+
+function is_referer_search_engine($engine = 'google') {
+	$referer = urldecode($_SERVER[HTTP_REFERER]);
+
+	if ( ! $engine ) {
+		return 0;
+	}
+
+	switch ($engine) {
+	case 'google':
+		if (preg_match('|^http://(www)?\.?google\.*|i',$referer)) {
+			return 1;
+		}
+		break;
+	}
+
+	return 0;
+}
+
+function hilite($text) {
+	$search_engines = array('google');
+
+	foreach ($search_engines as $engine) {
+		if ( is_referer_search_engine($engine) ) {
+			$query_terms = get_search_query_terms($engine);
+			foreach ($query_terms as $term) {
+				if (!preg_match('/<.+>/',$text)) {
+					$text = preg_replace('/(\b'.$term.'\b)/i','<span class="hilite">$1</span>',$text);
+				} else {
+					$text = preg_replace('/(?<=>)([^<]+)?(\b'.$term.'\b)/i','$1<span class="hilite">$2</span>',$text);
+				}
+			}
+		break;
+		}
+	}
+
+	return $text;
+}
+
+
 // Check for hacks file if the option is enabled
 if (get_settings('hack_file')) {
 	if (file_exists(ABSPATH . '/my-hacks.php'))