Introduce IgnoreErrorExtension

src/Analyser/AnalyserResultFinalizer.php

@@ -19,6 +19,7 @@ final class AnalyserResultFinalizer
 
 	public function __construct(
 		private RuleRegistry $ruleRegistry,
+		private IgnoreErrorExtensionProvider $ignoreErrorExtensionProvider,
 		private RuleErrorTransformer $ruleErrorTransformer,
 		private ScopeFactory $scopeFactory,
 		private LocalIgnoresProcessor $localIgnoresProcessor,
@@ -92,6 +93,16 @@ public function finalize(AnalyserResult $analyserResult, bool $onlyFiles, bool $
 			}
 		}
 
+		$tempCollectorErrors = array_filter($tempCollectorErrors, function (string $error) use ($scope, $node) : bool {
+			foreach ($this->ignoreErrorExtensionProvider->getExtensions() as $ignoreErrorExtension) {
+				if ($ignoreErrorExtension->ignore($error, $node, $scope)) {
+					return false;
+				}
+			}
+
+			return true;
+		});
+
 		$errors = $analyserResult->getUnorderedErrors();
 		$locallyIgnoredErrors = $analyserResult->getLocallyIgnoredErrors();
 		$allLinesToIgnore = $analyserResult->getLinesToIgnore();

src/Analyser/FileAnalyser.php

@@ -51,6 +51,7 @@ public function __construct(
 		private NodeScopeResolver $nodeScopeResolver,
 		private Parser $parser,
 		private DependencyResolver $dependencyResolver,
+		private IgnoreErrorExtensionProvider $ignoreErrorExtensionProvider,
 		private RuleErrorTransformer $ruleErrorTransformer,
 		private LocalIgnoresProcessor $localIgnoresProcessor,
 	)
@@ -142,7 +143,15 @@ public function analyseFile(
 						}
 
 						foreach ($ruleErrors as $ruleError) {
-							$temporaryFileErrors[] = $this->ruleErrorTransformer->transform($ruleError, $scope, $nodeType, $node->getStartLine());
+							$error = $this->ruleErrorTransformer->transform($ruleError, $scope, $nodeType, $node->getStartLine());
+
+							foreach ($this->ignoreErrorExtensionProvider->getExtensions() as $ignoreErrorExtension) {
+								if ($ignoreErrorExtension->ignore($error, $node, $scope)) {
+									continue 2;
+								}
+							}
+
+							$temporaryFileErrors[] = $error;
 						}
 					}
 
@@ -281,6 +290,17 @@ public function analyseFile(
 			unset($unmatchedLineIgnores[$fileKey]);
 		}
 
+		$fileErrors = array_filter($fileErrors, function (Error $error) use ($scope) : bool {
+			foreach ($this->ignoreErrorExtensionProvider->getExtensions() as $ignoreErrorExtension) {
+				if ($ignoreErrorExtension->ignore($error, null, $scope)) {
+					return false;
+				}
+			}
+
+			return true;
+		});
+
+
 		return new FileAnalyserResult(
 			$fileErrors,
 			$this->filteredPhpErrors,

src/Analyser/IgnoreErrorExtension.php

@@ -0,0 +1,32 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Analyser;
+
+use PhpParser\Node;
+
+/**
+ * This is the extension interface to implement if you want to ignore errors
+ * based on the node and scope.
+ *
+ * To register it in the configuration file use the `phpstan.ignoreErrorExtension` service tag:
+ *
+ * ```
+ * services:
+ * 	-
+ *		class: App\PHPStan\MyExtension
+ *		tags:
+ *			- phpstan.ignoreErrorExtension
+ * ```
+ *
+ * Learn more: https://phpstan.org
+ *
+ * @api
+ */
+interface IgnoreErrorExtension
+{
+
+	public const EXTENSION_TAG = 'phpstan.ignoreErrorExtension';
+
+	public function ignore(Error $error, ?Node $node, Scope $scope): bool;
+
+}

src/Analyser/IgnoreErrorExtensionProvider.php

@@ -0,0 +1,22 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Analyser;
+
+use PHPStan\DependencyInjection\Container;
+
+final class IgnoreErrorExtensionProvider
+{
+
+	public function __construct(private Container $container)
+	{
+	}
+
+	/**
+	 * @return IgnoreErrorExtension[]
+	 */
+	public function getExtensions(): array
+	{
+		return $this->container->getServicesByTag(IgnoreErrorExtension::EXTENSION_TAG);
+	}
+
+}