From 755da4bc0e52b8f2ce8a2a470974b6a4a322bc53 Mon Sep 17 00:00:00 2001
From: Steven Wittens <steven@10.no-reply.drupal.org>
Date: Wed, 20 Apr 2005 02:55:20 +0000
Subject: [PATCH] - Make the auto-linebreak filter also ignore the contents of
 <script>.   This makes it easier to use JavaScript (e.g. Google Adsense)
 inside blocks.

---
 modules/filter.module        | 28 ++++++++++++++++++++++------
 modules/filter/filter.module | 28 ++++++++++++++++++++++------
 2 files changed, 44 insertions(+), 12 deletions(-)

diff --git a/modules/filter.module b/modules/filter.module
index dd142ca2405..c77c51351e9 100644
--- a/modules/filter.module
+++ b/modules/filter.module
@@ -942,18 +942,34 @@ function _filter_html($text, $format) {
  * Based on: http://photomatt.net/scripts/autop
  */
 function _filter_autop($text) {
-  // Split at <pre> and </pre> tags
-  $chunks = preg_split('@(</?pre[^>]*>)@', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
+  // Split at <pre>, <script> and </pre>, </script> tags.
+  // We don't apply any processing to the contents of these tags to avoid messing
+  // up code. We look for matched pairs and allow basic nesting. For example:
+  // "processed <pre> ignored <script> ignored </script> ignored </pre> processed"
+  $chunks = preg_split('@(</?(?:pre|script)[^>]*>)@', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
   // Note: PHP ensures the array consists of alternating delimiters and literals
   // and begins and ends with a literal (inserting NULL as required).
-  $pre = false;
+  $ignore = false;
+  $ignoretag = '';
   $output = '';
   foreach ($chunks as $i => $chunk) {
     if ($i % 2) {
-      // Opening or closing pre tag?
-      $pre = ($chunk{1} != '/');
+      // Opening or closing tag?
+      $open = ($chunk{1} != '/');
+      list(, $tag) = split('[< ]', $chunk);
+      if (!$ignore) {
+        if ($open) {
+          $ignore = true;
+          $ignoretag = $tag;
+        }
+      }
+      // Only allow a matching tag to close it.
+      else if (!$open && $ignoretag == $tag) {
+        $ignore = false;
+        $ignoretag = '';
+      }
     }
-    else if (!$pre) {
+    else if (!$ignore) {
       $chunk = preg_replace('|\n*$|', '', $chunk) ."\n\n"; // just to make things a little easier, pad the end
       $chunk = preg_replace('|<br />\s*<br />|', "\n\n", $chunk);
       $chunk = preg_replace('!(<(?:table|ul|ol|li|pre|form|blockquote|h[1-6])[^>]*>)!', "\n$1", $chunk); // Space things out a little
diff --git a/modules/filter/filter.module b/modules/filter/filter.module
index dd142ca2405..c77c51351e9 100644
--- a/modules/filter/filter.module
+++ b/modules/filter/filter.module
@@ -942,18 +942,34 @@ function _filter_html($text, $format) {
  * Based on: http://photomatt.net/scripts/autop
  */
 function _filter_autop($text) {
-  // Split at <pre> and </pre> tags
-  $chunks = preg_split('@(</?pre[^>]*>)@', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
+  // Split at <pre>, <script> and </pre>, </script> tags.
+  // We don't apply any processing to the contents of these tags to avoid messing
+  // up code. We look for matched pairs and allow basic nesting. For example:
+  // "processed <pre> ignored <script> ignored </script> ignored </pre> processed"
+  $chunks = preg_split('@(</?(?:pre|script)[^>]*>)@', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
   // Note: PHP ensures the array consists of alternating delimiters and literals
   // and begins and ends with a literal (inserting NULL as required).
-  $pre = false;
+  $ignore = false;
+  $ignoretag = '';
   $output = '';
   foreach ($chunks as $i => $chunk) {
     if ($i % 2) {
-      // Opening or closing pre tag?
-      $pre = ($chunk{1} != '/');
+      // Opening or closing tag?
+      $open = ($chunk{1} != '/');
+      list(, $tag) = split('[< ]', $chunk);
+      if (!$ignore) {
+        if ($open) {
+          $ignore = true;
+          $ignoretag = $tag;
+        }
+      }
+      // Only allow a matching tag to close it.
+      else if (!$open && $ignoretag == $tag) {
+        $ignore = false;
+        $ignoretag = '';
+      }
     }
-    else if (!$pre) {
+    else if (!$ignore) {
       $chunk = preg_replace('|\n*$|', '', $chunk) ."\n\n"; // just to make things a little easier, pad the end
       $chunk = preg_replace('|<br />\s*<br />|', "\n\n", $chunk);
       $chunk = preg_replace('!(<(?:table|ul|ol|li|pre|form|blockquote|h[1-6])[^>]*>)!', "\n$1", $chunk); // Space things out a little