add support for literal-string

Author: voku

Makefile

@@ -29,7 +29,7 @@ psalm:
 
 .PHONY: test
 test:
-	docker run -it --rm -v${PWD}:/opt/project -w /opt/project php:7.2 tools/phpunit
+	docker run -it --rm -v${PWD}:/opt/project -w /opt/project php:7.3 tools/phpunit
 
 .PHONY: pre-commit-test
 pre-commit-test: test phpcs phpstan psalm

src/PseudoTypes/LiteralString.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of phpDocumentor.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @link      http://phpdoc.org
+ */
+
+namespace phpDocumentor\Reflection\PseudoTypes;
+
+use phpDocumentor\Reflection\PseudoType;
+use phpDocumentor\Reflection\Type;
+use phpDocumentor\Reflection\Types\String_;
+
+/**
+ * Value Object representing the type 'string'.
+ *
+ * @psalm-immutable
+ */
+final class LiteralString extends String_ implements PseudoType
+{
+    public function underlyingType(): Type
+    {
+        return new String_();
+    }
+
+    /**
+     * Returns a rendered output of the Type as it would be used in a DocBlock.
+     */
+    public function __toString(): string
+    {
+        return 'literal-string';
+    }
+}

src/TypeResolver.php

@@ -102,6 +102,7 @@ final class TypeResolver
         'callable-string' => PseudoTypes\CallableString::class,
         'false' => PseudoTypes\False_::class,
         'true' => PseudoTypes\True_::class,
+        'literal-string' => PseudoTypes\LiteralString::class,
         'self' => Types\Self_::class,
         '$this' => Types\This::class,
         'static' => Types\Static_::class,

tests/unit/TypeResolverTest.php

@@ -758,6 +758,7 @@ public function provideKeywords(): array
             ['parent', Types\Parent_::class],
             ['iterable', Types\Iterable_::class],
             ['never', Types\Never_::class],
+            ['literal-string', PseudoTypes\LiteralString::class],
         ];
     }