Output SelectedNode from OneOf

Author: vojtech-dobes

src/GrammarProcessing/SelectedNode.php

@@ -0,0 +1,28 @@
+<?php declare(strict_types=1);
+
+namespace Vojtechdobes\GrammarProcessing;
+
+use LogicException;
+
+
+final class SelectedNode implements Node
+{
+
+	public string $name {
+
+		get {
+			throw new LogicException(
+				self::class . " must be parsed manually",
+			);
+		}
+
+	}
+
+
+
+	public function __construct(
+		public readonly int $index,
+		public readonly Node $value,
+	) {}
+
+}

src/GrammarProcessing/Vocabulary/OneOf.php

@@ -36,13 +36,14 @@ public function acceptNode(
 		$attempts = [];
 		$localError = new GrammarProcessing\Error();
 
-		foreach ($this->symbols as $symbol) {
+		foreach ($this->symbols as $i => $symbol) {
 			$tokenStreamCopy = clone $tokenStream;
 
 			try {
 				$node = $symbol->acceptNode($error, $tokenStreamCopy, $nonterminals);
 
 				$attempts[] = [
+					'index' => $i,
 					'node' => $node,
 					'tokenStream' => $tokenStreamCopy,
 				];
@@ -64,7 +65,11 @@ public function acceptNode(
 		$result = array_pop($attempts);
 
 		$tokenStream->advanceTo($result['tokenStream']);
-		return $result['node'];
+
+		return new GrammarProcessing\SelectedNode(
+			$result['index'],
+			$result['node'],
+		);
 	}