Filters::renderHtmlAttribute() specially supports bool attributes

Author: dg

src/Latte/Helpers.php

@@ -22,6 +22,14 @@ class Helpers
 		'col' => 1, 'link' => 1, 'param' => 1, 'basefont' => 1, 'frame' => 1, 'isindex' => 1, 'wbr' => 1, 'command' => 1, 'track' => 1,
 	];
 
+	/** @var array<string, int>  boolean HTML attributes */
+	public static array $booleanAttributes = [
+		'allowfullscreen' => 1, 'async' => 1, 'autofocus' => 1, 'autoplay' => 1, 'checked' => 1, 'controls' => 1, 'default' => 1, 'defer' => 1,
+		'disabled' => 1, 'formnovalidate' => 1, 'inert' => 1, 'ismap' => 1, 'itemscope' => 1, 'loop' => 1, 'multiple' => 1, 'muted' => 1,
+		'nomodule' => 1, 'novalidate' => 1, 'open' => 1, 'playsinline' => 1, 'readonly' => 1, 'required' => 1, 'reversed' => 1, 'selected' => 1,
+		'shadowrootclonable' => 1, 'shadowrootdelegatesfocus' => 1, 'shadowrootserializable' => 1,
+	];
+
 
 	/**
 	 * Finds the best suggestion.

src/Latte/Runtime/Filters.php

@@ -288,6 +288,9 @@ public static function renderHtmlAttribute(string $name, mixed $value): ?string
 		} elseif ($value === true) {
 			return $name;
 
+		} elseif (isset(Latte\Helpers::$booleanAttributes[$name])) {
+			return $value ? $name : null;
+
 		} elseif (is_array($value)) {
 			if (str_starts_with($name, 'data-')) {
 				return $name . "='"

tests/filters/renderHtmlAttribute.phpt

@@ -37,9 +37,10 @@ test('Regular text attributes', function () {
 
 test('boolean attributes', function () {
 	Assert::same('disabled', Filters::renderHtmlAttribute('disabled', true));
+	Assert::same('disabled', Filters::renderHtmlAttribute('disabled', 1));
 	Assert::null(Filters::renderHtmlAttribute('disabled', false));
 	Assert::null(Filters::renderHtmlAttribute('required', null));
-	Assert::same('readonly="0"', Filters::renderHtmlAttribute('readonly', 0));
+	Assert::null(Filters::renderHtmlAttribute('readonly', 0));
 });