✨ method parameter default value rendering

src/DocBlock/Tags/Factory/MethodFactory.php

@@ -57,7 +57,7 @@ function (MethodTagValueParameterNode $param) use ($context) {
                         ),
                         $param->isReference,
                         $param->isVariadic,
-                        (string) $param->defaultValue
+                        $param->defaultValue === null ? MethodParameter::NO_DEFAULT_VALUE : (string) $param->defaultValue
                     );
                 },
                 $tagValue->parameters

src/DocBlock/Tags/Factory/MethodParameterFactory.php

@@ -0,0 +1,95 @@
+<?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\DocBlock\Tags\Factory;
+
+use phpDocumentor\Reflection\DocBlock\Tags\Formatter;
+use function str_repeat;
+use function strlen;
+
+/**
+ * @internal This class is not part of the BC promise of this library.
+ */
+final class MethodParameterFactory
+{
+    /**
+     * Formats the given default value to a string-able mixin
+     *
+     * @param mixed $defaultValue
+     * @return string
+     */
+    public function format($defaultValue): string
+    {
+        if (method_exists($this, $method = 'format'.ucfirst(gettype($defaultValue)))) {
+            return ' = ' . $this->{$method}($defaultValue);
+        }
+        return '';
+    }
+
+    private function formatDouble(float $defaultValue): string
+    {
+        return var_export($defaultValue, true);
+    }
+
+    /**
+     * @param mixed $defaultValue
+     * @return string
+     */
+    private function formatNull($defaultValue): string
+    {
+        return 'null';
+    }
+
+    private function formatInteger(int $defaultValue): string
+    {
+        return var_export($defaultValue, true);
+    }
+
+    private function formatString(string $defaultValue): string
+    {
+        return var_export($defaultValue, true);
+    }
+
+    private function formatBoolean(bool $defaultValue): string
+    {
+        return var_export($defaultValue, true);
+    }
+
+    /**
+     * @param array<array, null, int, float, bool, string, object> $defaultValue
+     * @return string
+     */
+    private function formatArray(array $defaultValue): string
+    {
+        $formatedValue = '[';
+
+        foreach ($defaultValue as $key => $value) {
+            if (method_exists($this, $method = 'format'.ucfirst(gettype($value)))) {
+                $formatedValue .= $this->{$method}($value);
+
+                if ($key !== array_key_last($defaultValue)) {
+                    $formatedValue .= ',';
+                }
+            }
+        }
+
+        $formatedValue .= ']';
+
+        return $formatedValue;
+    }
+
+    private function formatObject(object $defaultValue): string
+    {
+        return 'new '. get_class($defaultValue). '()';
+    }
+}

src/DocBlock/Tags/Method.php

@@ -261,10 +261,7 @@ public function __toString(): string
     {
         $arguments = [];
         foreach ($this->parameters as $parameter) {
-            $arguments[] = $parameter->getType() . ' ' .
-                ($parameter->isReference() ? '&' : '') .
-                ($parameter->isVariadic() ? '...' : '') .
-                '$' . $parameter->getName();
+            $arguments[] = (string) $parameter;
         }
 
         $argumentStr = '(' . implode(', ', $arguments) . ')';

src/DocBlock/Tags/MethodParameter.php

@@ -12,6 +12,7 @@
 
 namespace phpDocumentor\Reflection\DocBlock\Tags;
 
+use phpDocumentor\Reflection\DocBlock\Tags\Factory\MethodParameterFactory;
 use phpDocumentor\Reflection\Type;
 
 final class MethodParameter
@@ -24,14 +25,22 @@ final class MethodParameter
 
     private string $name;
 
-    private ?string $defaultValue = null;
+    /**
+     * @var mixed
+     */
+    private $defaultValue;
 
+    public const NO_DEFAULT_VALUE = '__NO_VALUE__';
+
+    /**
+     * @param mixed $defaultValue
+     */
     public function __construct(
         string $name,
         Type $type,
         bool $isReference = false,
         bool $isVariadic = false,
-        ?string $defaultValue = null
+        $defaultValue = self::NO_DEFAULT_VALUE
     ) {
         $this->type = $type;
         $this->isReference = $isReference;
@@ -60,8 +69,17 @@ public function isVariadic(): bool
         return $this->isVariadic;
     }
 
-    public function getDefaultValue(): ?string
+    public function getDefaultValue(): mixed
     {
         return $this->defaultValue;
     }
+
+    public function __toString(): string
+    {
+        return $this->getType() . ' ' .
+            ($this->isReference() ? '&' : '') .
+            ($this->isVariadic() ? '...' : '') .
+            '$' . $this->getName() .
+            ($this->getDefaultValue() !== self::NO_DEFAULT_VALUE ? (new MethodParameterFactory)->format($this->getDefaultValue()) : '');
+    }
 }

tests/unit/DocBlock/Tags/MethodParameterTest.php

@@ -0,0 +1,95 @@
+<?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\DocBlock\Tags;
+
+use Mockery as m;
+use phpDocumentor\Reflection\Fqsen;
+use phpDocumentor\Reflection\Type;
+use phpDocumentor\Reflection\Types\Array_;
+use phpDocumentor\Reflection\Types\Boolean;
+use phpDocumentor\Reflection\Types\Float_;
+use phpDocumentor\Reflection\Types\Integer;
+use phpDocumentor\Reflection\Types\Nullable;
+use phpDocumentor\Reflection\Types\Object_;
+use phpDocumentor\Reflection\Types\String_;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @coversDefaultClass \phpDocumentor\Reflection\DocBlock\Tags\Method
+ * @covers ::<private>
+ */
+class MethodParameterTest extends TestCase
+{
+    /**
+     * Call Mockery::close after each test.
+     */
+    public function tearDown(): void
+    {
+        m::close();
+    }
+
+    public function collectionDefaultValuesProvider(): array
+    {
+        return [
+            [new String_(), '1', '\'1\''],
+            [new Integer(), 1, '1'],
+            [new Boolean(), true, 'true'],
+            [new Float_(), 1.23, '1.23'],
+            [new Array_(), [1, '2', true], '[1,\'2\',true]'],
+            [new Array_(), [[1, 2], '2', true], '[[1,2],\'2\',true]'],
+            [new Nullable(new Float_()), null, 'null'],
+            [new Nullable(new Float_()), 1.23, '1.23'],
+            [new Object_(new Fqsen('\\stdClass')), new \stdClass(), 'new stdClass()'],
+        ];
+    }
+
+    /**
+     * @uses   \phpDocumentor\Reflection\DocBlock\Tags\MethodParameter::__construct
+     * @uses   \phpDocumentor\Reflection\DocBlock\Tags\MethodParameter::getDefaultValue()
+     * @uses   \phpDocumentor\Reflection\DocBlock\Tags\MethodParameter::__toString
+     * @uses   \phpDocumentor\Reflection\DocBlock\Tags\Formatter\PassthroughFormatter
+     *
+     * @dataProvider collectionDefaultValuesProvider
+     * @covers \phpDocumentor\Reflection\DocBlock\Tags\BaseTag::render
+     * @covers \phpDocumentor\Reflection\DocBlock\Tags\BaseTag::getName
+     */
+    public function testIfTagCanBeRenderedUsingMethodParameterWithDefaultValue(Type $type, $defaultValue, string $defaultValueStr): void
+    {
+        $fixture = new MethodParameter('argument', $type, false, false, $defaultValue);
+
+        $this->assertSame(
+            sprintf('%s $argument = %s', $type, $defaultValueStr),
+            (string) $fixture
+        );
+    }
+
+    /**
+     * @uses   \phpDocumentor\Reflection\DocBlock\Tags\MethodParameter::__construct
+     * @uses   \phpDocumentor\Reflection\DocBlock\Tags\MethodParameter::getDefaultValue()
+     * @uses   \phpDocumentor\Reflection\DocBlock\Tags\MethodParameter::__toString
+     * @uses   \phpDocumentor\Reflection\DocBlock\Tags\Formatter\PassthroughFormatter
+     *
+     * @covers \phpDocumentor\Reflection\DocBlock\Tags\BaseTag::render
+     * @covers \phpDocumentor\Reflection\DocBlock\Tags\BaseTag::getName
+     */
+    public function testIfTagCanBeRenderedUsingMethodParameterWithNoDefaultValue(): void
+    {
+        $fixture = new MethodParameter('argument', new Float_());
+
+        $this->assertSame(
+            'float $argument',
+            (string) $fixture
+        );
+    }
+}