RegexArrayShapeMatcher - support resetting non-capturing groups

Author: staabm

src/Type/Php/RegexArrayShapeMatcher.php

@@ -133,7 +133,7 @@ private function matchRegex(string $regex, ?int $flags, TrinaryLogic $wasMatched
 						$isOptionalAlternation = $group->inOptionalAlternation();
 						$group->forceNonOptional();
 						$beforeCurrentCombo = false;
-					} elseif ($beforeCurrentCombo) {
+					} elseif ($beforeCurrentCombo && !$group->resetsGroupCounter()) {
 						$group->forceNonOptional();
 					} elseif ($group->getAlternationId() === $onlyTopLevelAlternationId) {
 						unset($comboList[$groupId]);
@@ -385,6 +385,15 @@ private function walkRegexAst(
 				$inAlternation ? $alternationId : null,
 				$inOptionalQuantification,
 				$parentGroup,
+				false,
+			);
+			$parentGroup = $group;
+		} elseif ($ast->getId() === '#noncapturingreset') {
+			$group = new RegexNonCapturingGroup(
+				$inAlternation ? $alternationId : null,
+				$inOptionalQuantification,
+				$parentGroup,
+				true,
 			);
 			$parentGroup = $group;
 		}

src/Type/Php/RegexCapturingGroup.php

@@ -32,6 +32,11 @@ public function restoreNonOptional(): void
 		$this->forceNonOptional = false;
 	}
 
+	public function resetsGroupCounter(): bool
+	{
+		return $this->parent instanceof RegexNonCapturingGroup && $this->parent->resetsGroupCounter();
+	}
+
 	/** @phpstan-assert-if-true !null $this->getAlternationId() */
 	public function inAlternation(): bool
 	{

src/Type/Php/RegexNonCapturingGroup.php

@@ -9,6 +9,7 @@ public function __construct(
 		private ?int $alternationId,
 		private bool $inOptionalQuantification,
 		private RegexCapturingGroup|RegexNonCapturingGroup|null $parent,
+		private bool $resetGroupCounter,
 	)
 	{
 	}
@@ -42,4 +43,9 @@ public function getParent(): RegexCapturingGroup|RegexNonCapturingGroup|null
 		return $this->parent;
 	}
 
+	public function resetsGroupCounter(): bool
+	{
+		return $this->resetGroupCounter;
+	}
+
 }

tests/PHPStan/Analyser/nsrt/preg_match_shapes.php

@@ -360,3 +360,14 @@ function bug11277b(string $value): void
 		}
 	}
 }
+
+// https://www.pcre.org/current/doc/html/pcre2pattern.html#dupgroupnumber
+// https://3v4l.org/09qdT
+function bug11291(string $s): void {
+	if (preg_match('/(?|(a)|(b)(c)|(d)(e)(f))/', $s, $matches)) {
+		assertType('array{0: string, 1: string, 2?: string, 3?: string}', $matches);
+	} else {
+		assertType('array{}', $matches);
+	}
+	assertType('array{}|array{0: string, 1: string, 2?: string, 3?: string}', $matches);
+}