From 07c2566042b574a7ce3ba104a6b57fa0a77b1a8a Mon Sep 17 00:00:00 2001
From: Aidan Woods <aidantwoods@gmail.com>
Date: Sun, 20 Jan 2019 02:27:10 +0000
Subject: [PATCH] Implement Header

---
 src/Components/Blocks/Header.php | 84 ++++++++++++++++++++++++++++++++
 src/Parsedown.php                | 33 -------------
 2 files changed, 84 insertions(+), 33 deletions(-)
 create mode 100644 src/Components/Blocks/Header.php

diff --git a/src/Components/Blocks/Header.php b/src/Components/Blocks/Header.php
new file mode 100644
index 0000000..bf93ddb
--- /dev/null
+++ b/src/Components/Blocks/Header.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace Erusev\Parsedown\Components\Blocks;
+
+use Erusev\Parsedown\AST\Handler;
+use Erusev\Parsedown\AST\StateRenderable;
+use Erusev\Parsedown\Components\Block;
+use Erusev\Parsedown\Configurables\StrictMode;
+use Erusev\Parsedown\Html\Renderables\Element;
+use Erusev\Parsedown\Parsedown;
+use Erusev\Parsedown\Parsing\Context;
+use Erusev\Parsedown\State;
+
+final class Header implements Block
+{
+    use BlockAcquisition;
+
+    /** @var string */
+    private $text;
+
+    /** @var 1|2|3|4|5|6 */
+    private $level;
+
+    /**
+     * @param string $text
+     * @param 1|2|3|4|5|6 $level
+     */
+    public function __construct($text, $level)
+    {
+        $this->text = $text;
+        $this->level = $level;
+    }
+
+    /**
+     * @param Context $Context
+     * @param Block|null $Block
+     * @param State|null $State
+     * @return static|null
+     */
+    public static function build(
+        Context $Context,
+        Block $Block = null,
+        State $State = null
+    ) {
+        $State = $State ?: new State;
+
+        $level = \strspn($Context->line()->text(), '#');
+
+        if ($level > 6 || $level < 1) {
+            return null;
+        }
+
+        /** @var 1|2|3|4|5|6 $level */
+
+        $text = \trim($Context->line()->text(), '#');
+
+        $StrictMode = $State->getOrDefault(StrictMode::class);
+
+        if ($StrictMode->enabled() && isset($text[0]) and $text[0] !== ' ') {
+            return null;
+        }
+
+        $text = \trim($text, ' ');
+
+        return new self($text, $level);
+    }
+
+    /**
+     * @return Handler<Element>
+     */
+    public function stateRenderable(Parsedown $Parsedown)
+    {
+        return new Handler(
+            /** @return Element */
+            function (State $State) use ($Parsedown) {
+                return new Element(
+                    'h' . \strval($this->level),
+                    [],
+                    $State->applyTo($Parsedown->lineElements($this->text))
+                );
+            }
+        );
+    }
+}
diff --git a/src/Parsedown.php b/src/Parsedown.php
index b7787ac..1f3dc4f 100644
--- a/src/Parsedown.php
+++ b/src/Parsedown.php
@@ -334,39 +334,6 @@ class Parsedown
         return $Block;
     }
 
-    #
-    # Header
-
-    protected function blockHeader(Context $Context)
-    {
-        $level = \strspn($Context->line()->text(), '#');
-
-        if ($level > 6) {
-            return;
-        }
-
-        $text = \trim($Context->line()->text(), '#');
-
-        if ($this->strictMode and isset($text[0]) and $text[0] !== ' ') {
-            return;
-        }
-
-        $text = \trim($text, ' ');
-
-        $Block = [
-            'element' => [
-                'name' => 'h' . $level,
-                'handler' => [
-                    'function' => 'lineElements',
-                    'argument' => $text,
-                    'destination' => 'elements',
-                ]
-            ],
-        ];
-
-        return $Block;
-    }
-
     #
     # List