refactor: extract codeline, hr to helper

Author: adhocore

Diff for: src/BlockElementParser.php

@@ -129,8 +129,7 @@ private function codeInternal($codeBlock)
             if (($codeBlock && \substr(\ltrim($this->line), 0, 3) !== '```')
                 || \strpos($this->line, $this->indentStr) === 0
             ) {
-                $this->markup .= "\n"; // @todo: donot use \n for first line
-                $this->markup .= $codeBlock ? $this->line : \substr($this->line, $this->indentLen);
+                $this->markup .= $this->codeLine($this->line, $codeBlock, $this->indentLen);
 
                 $this->pointer++;
 
@@ -143,13 +142,9 @@ private function codeInternal($codeBlock)
 
     protected function rule()
     {
-        if ($this->trimmedPrevLine === ''
-            && \preg_match(static::RE_MD_RULE, $this->trimmedLine)
-        ) {
-            $this->markup .= "\n<hr />";
+        $this->markup .= $hr = $this->hr($this->trimmedPrevLine, $this->trimmedLine);
 
-            return \true;
-        }
+        return (bool) $hr;
     }
 
     protected function listt()

Diff for: src/HtmlHelper.php

@@ -31,6 +31,13 @@ public function h($level, $line)
         return '';
     }
 
+    public function hr($prevLine, $line)
+    {
+        if ($prevLine === '' && \preg_match(BlockElementParser::RE_MD_RULE, $line)) {
+            return "\n<hr />";
+        }
+    }
+
     public function codeStart($lang)
     {
         $lang = isset($lang[1])
@@ -40,6 +47,14 @@ public function codeStart($lang)
         return "\n<pre><code{$lang}>";
     }
 
+    public function codeLine($line, $isBlock, $indentLen = 4)
+    {
+        $code  = "\n"; // @todo: donot use \n for first line
+        $code .= $isBlock ? $line : \substr($line, $indentLen);
+
+        return $code;
+    }
+
     public function tableStart($line, $delim = '|')
     {
         $table = "<table>\n<thead>\n<tr>\n";