Merge pull request #701 from aidantwoods/fix/spaces-in-class-names-1.8.x-beta

[1.8.x-beta] Fix spaces in class names

.travis.yml

@@ -13,13 +13,11 @@ matrix:
     - php: 7.0
     - php: 7.1
     - php: 7.2
+    - php: 7.3
     - php: nightly
-    - php: hhvm
-    - php: hhvm-nightly
   fast_finish: true
   allow_failures:
     - php: nightly
-    - php: hhvm-nightly
 
 install:
   - composer install --prefer-dist --no-interaction --no-progress

Parsedown.php

@@ -469,7 +469,21 @@ class Parsedown
 
         if ($infostring !== '')
         {
-            $Element['attributes'] = array('class' => "language-$infostring");
+            /**
+             * https://www.w3.org/TR/2011/WD-html5-20110525/elements.html#classes
+             * Every HTML element may have a class attribute specified.
+             * The attribute, if specified, must have a value that is a set
+             * of space-separated tokens representing the various classes
+             * that the element belongs to.
+             * [...]
+             * The space characters, for the purposes of this specification,
+             * are U+0020 SPACE, U+0009 CHARACTER TABULATION (tab),
+             * U+000A LINE FEED (LF), U+000C FORM FEED (FF), and
+             * U+000D CARRIAGE RETURN (CR).
+             */
+            $language = substr($infostring, 0, strcspn($infostring, " \t\n\f\r"));
+
+            $Element['attributes'] = array('class' => "language-$language");
         }
 
         $Block = array(