From 9d407c370605fa29bc77efd0db1dcc2da5b8a30e Mon Sep 17 00:00:00 2001
From: Michael Ochmann <michael.ochmann@propeller.de>
Date: Thu, 18 Aug 2022 17:19:36 +0200
Subject: [PATCH] now parsing `id` and `class` annotations on paragraphs

---
 src/Parser.php | 53 ++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 51 insertions(+), 2 deletions(-)

diff --git a/src/Parser.php b/src/Parser.php
index 208db2e..ff48133 100644
--- a/src/Parser.php
+++ b/src/Parser.php
@@ -2,6 +2,7 @@
 
 namespace parkdown;
 
+use Attribute;
 use DOMDocument;
 use DOMElement;
 use DOMNode;
@@ -11,6 +12,11 @@ enum ListType {
 	case UNORDERED;
 }
 
+class Attributes {
+	public array   $classes = [];
+	public ?string $id      = null;
+}
+
 class Parser {
 	const MAGIC_CHAR = "*";
 
@@ -148,8 +154,8 @@ class Parser {
 	}
 
 	private function parseText($paragraph = false) : array {
-		$elms   = [];
-		$buffer = "";
+		$elms    = [];
+		$buffer  = "";
 		
 		$clearBuffer = function() use (&$elms, &$buffer) {
 			array_push($elms, $this->document->createTextNode($buffer));
@@ -228,6 +234,41 @@ class Parser {
 				$clearBuffer();
 				array_push($elms, $elm);
 				continue;
+			} elseif ($this->current()->type === TokenType::LBRACE) {
+				$lbrace  = $this->consume();
+				assert($lbrace->type === TokenType::LBRACE, "expected left brace, got ".$lbrace->type->name);
+
+				$content = "";
+				while ($this->current()->type !== TokenType::EOF &&
+						$this->current()->type !== TokenType::EOL &&
+						$this->current()->type !== TokenType::RBRACE) {
+					$content .= $this->consume()->data;
+				}
+				$rbrace = $this->consume();
+				assert($rbrace->type === TokenType::RBRACE, "expected right brace, got ".$rbrace->type->name);
+
+				$attributes = array_map(function($element) {
+					return trim($element);
+				}, explode(',', $content));
+
+				$obj = new Attributes();
+
+				foreach($attributes as $attribute) {
+					if (!in_array($attribute[0], [".", "#"]))
+						continue;
+					switch ($attribute[0]) {
+						case ".":
+							array_push($obj->classes, substr($attribute, 1));
+							break;
+						case "#":
+							$obj->id = substr($attribute, 1);
+							break;
+						default:
+							continue 2;
+					}
+				}
+
+				array_push($elms, $obj);
 			} else
 				$buffer .= self::StripBackslashes($this->consume()->data);
 		}
@@ -307,6 +348,14 @@ class Parser {
 		$elm = $this->document->createElement("p");
 		$i   = 0;
 		foreach ($elms as $node) {
+			if ($node instanceof Attributes) {
+				if (count($node->classes) > 0)
+					$elm->setAttribute("class", join(" ", $node->classes));
+				if ($node->id)
+					$elm->setAttribute("id", $node->id);
+				
+				continue;
+			}
 			if ($node->nodeName === "#text" && trim($node->textContent) === "")
 				continue;
 			$elm->appendChild($node);