TagProcessor: added support for empty elements (<br> by default)

src/Ast/Element.php

@@ -29,6 +29,15 @@ public function __construct($name, array $attributes = [])
 		}
 
 
+		/**
+		 * @return non-empty-string
+		 */
+		public function getName()
+		{
+			return $this->name;
+		}
+
+
 		public function format(array $parameters, Locale $locale)
 		{
 			$attrs = [];

src/Processors/TagProcessor.php

@@ -11,10 +11,24 @@ class TagProcessor implements \Inteve\Translator\MessageProcessor
 		/** @var \Inteve\Translator\MessageProcessor */
 		private $textPartsProcessor;
 
+		/** @var array<non-empty-string, TRUE> */
+		private $emptyElements;
 
-		public function __construct(\Inteve\Translator\MessageProcessor $textPartsProcessor = NULL)
+
+		/**
+		 * @param array<non-empty-string> $emptyElements
+		 */
+		public function __construct(
+			\Inteve\Translator\MessageProcessor $textPartsProcessor = NULL,
+			array $emptyElements = ['br']
+		)
 		{
 			$this->textPartsProcessor = $textPartsProcessor !== NULL ? $textPartsProcessor : new ParametersProcessor;
+			$this->emptyElements = [];
+
+			foreach ($emptyElements as $emptyElement) {
+				$this->emptyElements[strtolower($emptyElement)] = TRUE;
+			}
 		}
 
 
@@ -37,7 +51,7 @@ private function parseContent(Utils\StringParser $parser)
 					if (($part = $this->tryParseElement($parser)) !== NULL) {
 						$parts[] = $part;
 
-					} else { // invalid parameter
+					} else { // invalid tag
 						$parts[] = $parser->consume(1);
 					}
 
@@ -94,6 +108,10 @@ private function tryParseElement(Utils\StringParser $parser)
 
 				$parser->consumeText('>');
 
+				if (isset($this->emptyElements[$element->getName()])) {
+					return $element;
+				}
+
 				while (!$parser->isCurrent('</')) {
 					if ($parser->isCurrent('<')) {
 						$subElement = $this->tryParseElement($parser);

tests/Translator/TagProcessor.phpt

@@ -55,3 +55,13 @@ test('Complex', function () {
 			),
 	]), $processor->processMessage('{$param} lorem, <b title="Ipsum {$title}">{$name} <i>{$count}</i></b>'));
 });
+
+
+test('Empty elements', function () {
+	$processor = new TagProcessor;
+	Assert::equal(new Ast\MessageText([
+		'Lorem ipsum',
+		Ast\Element::create('br'),
+		'dolor sit amet',
+	]), $processor->processMessage('Lorem ipsum<br>dolor sit amet'));
+});