add IsException, IsError, and IsThrowable selectors

docs/documentation/selectors.md

@@ -34,6 +34,15 @@ The first selector will select all classes in the `App\User\Domain` namespace.
 
 The second one will select all classes in a namespace matching the regular expression.
 
+## Selector::isError()
+Select classes that extend the `\Error` class.
+
+## Selector::isException()
+Select classes that extend the `\Exception` class.
+
+## Selector::isThrowable()
+Select classes that implement the `\Throwable` interface.
+
 ## Selector::implements()
 Select classes that implement the given interface.
 

src/Selector/IsError.php

@@ -0,0 +1,18 @@
+<?php declare(strict_types=1);
+
+namespace PHPat\Selector;
+
+use PHPStan\Reflection\ClassReflection;
+
+final class IsError implements SelectorInterface
+{
+    public function getName(): string
+    {
+        return '-all errors-';
+    }
+
+    public function matches(ClassReflection $classReflection): bool
+    {
+        return $classReflection->isSubclassOf(\Error::class);
+    }
+}

src/Selector/IsException.php

@@ -0,0 +1,18 @@
+<?php declare(strict_types=1);
+
+namespace PHPat\Selector;
+
+use PHPStan\Reflection\ClassReflection;
+
+final class IsException implements SelectorInterface
+{
+    public function getName(): string
+    {
+        return '-all exceptions-';
+    }
+
+    public function matches(ClassReflection $classReflection): bool
+    {
+        return $classReflection->isSubclassOf(\Exception::class);
+    }
+}

src/Selector/IsThrowable.php

@@ -0,0 +1,18 @@
+<?php declare(strict_types=1);
+
+namespace PHPat\Selector;
+
+use PHPStan\Reflection\ClassReflection;
+
+final class IsThrowable implements SelectorInterface
+{
+    public function getName(): string
+    {
+        return '-all throwables-';
+    }
+
+    public function matches(ClassReflection $classReflection): bool
+    {
+        return $classReflection->implementsInterface(\Throwable::class);
+    }
+}

src/Selector/SelectorPrimitive.php

@@ -9,6 +9,21 @@ public static function all(): All
         return new All();
     }
 
+    public static function isException(): IsException
+    {
+        return new IsException();
+    }
+
+    public static function isThrowable(): IsThrowable
+    {
+        return new IsThrowable();
+    }
+
+    public static function isError(): IsError
+    {
+        return new IsError();
+    }
+
     /**
      * @deprecated
      * @see Selector::isInterface()