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ReturnTypePass.php
<?php /* * This file is part of Psy Shell. * * (c) 2012-2020 Justin Hileman * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Psy\CodeCleaner; use PhpParser\Node; use PhpParser\Node\Expr\Closure; use PhpParser\Node\Expr\ConstFetch; use PhpParser\Node\Identifier; use PhpParser\Node\NullableType; use PhpParser\Node\Stmt\Function_; use PhpParser\Node\Stmt\Return_; use Psy\Exception\FatalErrorException; /** * Add runtime validation for return types. */ class ReturnTypePass extends CodeCleanerPass { const MESSAGE = 'A function with return type must return a value'; const NULLABLE_MESSAGE = 'A function with return type must return a value (did you mean "return null;" instead of "return;"?)'; const VOID_MESSAGE = 'A void function must not return a value'; const VOID_NULL_MESSAGE = 'A void function must not return a value (did you mean "return;" instead of "return null;"?)'; const NULLABLE_VOID_MESSAGE = 'Void type cannot be nullable'; private $atLeastPhp71; private $returnTypeStack = []; public function __construct() { $this->atLeastPhp71 = \version_compare(\PHP_VERSION, '7.1', '>='); } /** * {@inheritdoc} */ public function enterNode(Node $node) { if (!$this->atLeastPhp71) { return; // @codeCoverageIgnore } if ($this->isFunctionNode($node)) { $this->returnTypeStack[] = $node->returnType; return; } if (!empty($this->returnTypeStack) && $node instanceof Return_) { $expectedType = \end($this->returnTypeStack); if ($expectedType === null) { return; } $msg = null; if ($this->typeName($expectedType) === 'void') { // Void functions if ($expectedType instanceof NullableType) { $msg = self::NULLABLE_VOID_MESSAGE; } elseif ($node->expr instanceof ConstFetch && \strtolower($node->expr->name) === 'null') { $msg = self::VOID_NULL_MESSAGE; } elseif ($node->expr !== null) { $msg = self::VOID_MESSAGE; } } else { // Everything else if ($node->expr === null) { $msg = $expectedType instanceof NullableType ? self::NULLABLE_MESSAGE : self::MESSAGE; } } if ($msg !== null) { throw new FatalErrorException($msg, 0, \E_ERROR, null, $node->getLine()); } } } /** * {@inheritdoc} */ public function leaveNode(Node $node) { if (!$this->atLeastPhp71) { return; // @codeCoverageIgnore } if (!empty($this->returnTypeStack) && $this->isFunctionNode($node)) { \array_pop($this->returnTypeStack); } } private function isFunctionNode(Node $node) { return $node instanceof Function_ || $node instanceof Closure; } private function typeName(Node $node) { if ($node instanceof NullableType) { return \strtolower($node->type->name); } if ($node instanceof Identifier) { return \strtolower($node->name); } throw new \InvalidArgumentException('Unable to find type name'); } }