Merge pull request #589 from NathanBaulch/hashtag

Support #hashtag per CommonMark and GFM specs

Parsedown.php

@@ -90,6 +90,15 @@ class Parsedown
 
     protected $safeMode;
 
+    function setStrictMode($strictMode)
+    {
+        $this->strictMode = (bool) $strictMode;
+
+        return $this;
+    }
+
+    protected $strictMode;
+
     protected $safeLinksWhitelist = array(
         'http://',
         'https://',
@@ -503,8 +512,6 @@ class Parsedown
     # Header
 
     protected function blockHeader($Line)
-    {
-        if (isset($Line['text'][1]))
     {
         $level = 1;
 
@@ -519,6 +526,12 @@ class Parsedown
         }
 
         $text = trim($Line['text'], '#');
+
+        if ($this->strictMode and isset($text[0]) and $text[0] !== ' ')
+        {
+            return;
+        }
+
         $text = trim($text, ' ');
 
         $Block = array(
@@ -534,7 +547,6 @@ class Parsedown
 
         return $Block;
     }
-    }
 
     #
     # List

test/ParsedownTest.php

@@ -51,6 +51,7 @@ class ParsedownTest extends TestCase
         $expectedMarkup = str_replace("\r", "\n", $expectedMarkup);
 
         $this->Parsedown->setSafeMode(substr($test, 0, 3) === 'xss');
+        $this->Parsedown->setStrictMode(substr($test, 0, 6) === 'strict');
 
         $actualMarkup = $this->Parsedown->text($markdown);
 

test/data/atx_heading.html

@@ -6,6 +6,8 @@
 <h6>h6</h6>
 <p>####### not a heading</p>
 <h1>closed h1</h1>
-<p>#</p>
+<h1></h1>
+<h2></h2>
 <h1># of levels</h1>
 <h1># of levels #</h1>
+<h1>heading</h1>

test/data/atx_heading.md

@@ -16,6 +16,10 @@
 
 #
 
+##
+
 # # of levels
 
 # # of levels # #
+
+#heading

test/data/strict_atx_heading.html

@@ -0,0 +1,13 @@
+<h1>h1</h1>
+<h2>h2</h2>
+<h3>h3</h3>
+<h4>h4</h4>
+<h5>h5</h5>
+<h6>h6</h6>
+<p>####### not a heading</p>
+<p>#not a heading</p>
+<h1>closed h1</h1>
+<h1></h1>
+<h2></h2>
+<h1># of levels</h1>
+<h1># of levels #</h1>

test/data/strict_atx_heading.md

@@ -0,0 +1,25 @@
+# h1
+
+## h2
+
+### h3
+
+#### h4
+
+##### h5
+
+###### h6
+
+####### not a heading
+
+#not a heading
+
+# closed h1 #
+
+#
+
+##
+
+# # of levels
+
+# # of levels # #