Web Journal

/home/kueuepay/public_html/vendor/psy/psysh/src/CodeCleaner/ImplicitReturnPass.php

<?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2023 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;
use PhpParser\Node\Expr\Exit_;
use PhpParser\Node\Stmt;
use PhpParser\Node\Stmt\Break_;
use PhpParser\Node\Stmt\Expression;
use PhpParser\Node\Stmt\If_;
use PhpParser\Node\Stmt\Namespace_;
use PhpParser\Node\Stmt\Return_;
use PhpParser\Node\Stmt\Switch_;

/**
 * Add an implicit "return" to the last statement, provided it can be returned.
 */
class ImplicitReturnPass extends CodeCleanerPass
{
    /**
     * @param array $nodes
     *
     * @return array
     */
    public function beforeTraverse(array $nodes): array
    {
        return $this->addImplicitReturn($nodes);
    }

    /**
     * @param array $nodes
     *
     * @return array
     */
    private function addImplicitReturn(array $nodes): array
    {
        // If nodes is empty, it can't have a return value.
        if (empty($nodes)) {
            return [new Return_(NoReturnValue::create())];
        }

        $last = \end($nodes);

        // Special case a few types of statements to add an implicit return
        // value (even though they technically don't have any return value)
        // because showing a return value in these instances is useful and not
        // very surprising.
        if ($last instanceof If_) {
            $last->stmts = $this->addImplicitReturn($last->stmts);

            foreach ($last->elseifs as $elseif) {
                $elseif->stmts = $this->addImplicitReturn($elseif->stmts);
            }

            if ($last->else) {
                $last->else->stmts = $this->addImplicitReturn($last->else->stmts);
            }
        } elseif ($last instanceof Switch_) {
            foreach ($last->cases as $case) {
                // only add an implicit return to cases which end in break
                $caseLast = \end($case->stmts);
                if ($caseLast instanceof Break_) {
                    $case->stmts = $this->addImplicitReturn(\array_slice($case->stmts, 0, -1));
                    $case->stmts[] = $caseLast;
                }
            }
        } elseif ($last instanceof Expr && !($last instanceof Exit_)) {
            // @codeCoverageIgnoreStart
            $nodes[\count($nodes) - 1] = new Return_($last, [
                'startLine' => $last->getStartLine(),
                'endLine'   => $last->getEndLine(),
            ]);
        // @codeCoverageIgnoreEnd
        } elseif ($last instanceof Expression && !($last->expr instanceof Exit_)) {
            $nodes[\count($nodes) - 1] = new Return_($last->expr, [
                'startLine' => $last->getStartLine(),
                'endLine'   => $last->getEndLine(),
            ]);
        } elseif ($last instanceof Namespace_) {
            $last->stmts = $this->addImplicitReturn($last->stmts);
        }

        // Return a "no return value" for all non-expression statements, so that
        // PsySH can suppress the `null` that `eval()` returns otherwise.
        //
        // Note that statements special cased above (if/elseif/else, switch)
        // _might_ implicitly return a value before this catch-all return is
        // reached.
        //
        // We're not adding a fallback return after namespace statements,
        // because code outside namespace statements doesn't really work, and
        // there's already an implicit return in the namespace statement anyway.
        if (self::isNonExpressionStmt($last)) {
            $nodes[] = new Return_(NoReturnValue::create());
        }

        return $nodes;
    }

    /**
     * Check whether a given node is a non-expression statement.
     *
     * As of PHP Parser 4.x, Expressions are now instances of Stmt as well, so
     * we'll exclude them here.
     *
     * @param Node $node
     */
    private static function isNonExpressionStmt(Node $node): bool
    {
        return $node instanceof Stmt &&
            !$node instanceof Expression &&
            !$node instanceof Return_ &&
            !$node instanceof Namespace_;
    }
}

[F] AbstractClassPass.php
[F] AssignThisVariablePass.php
[F] CalledClassPass.php
[F] CallTimePassByReferencePass.php
[F] CodeCleanerPass.php
[F] EmptyArrayDimFetchPass.php
[F] ExitPass.php
[F] FinalClassPass.php
[F] FunctionContextPass.php
[F] FunctionReturnInWriteContextPass.php
[F] ImplicitReturnPass.php
[F] IssetPass.php
[F] LabelContextPass.php
[F] LeavePsyshAlonePass.php
[F] ListPass.php
[F] LoopContextPass.php
[F] MagicConstantsPass.php
[F] NamespaceAwarePass.php
[F] NamespacePass.php
[F] NoReturnValue.php
[F] PassableByReferencePass.php
[F] RequirePass.php
[F] ReturnTypePass.php
[F] StrictTypesPass.php
[F] UseStatementPass.php
[F] ValidClassNamePass.php
[F] ValidConstructorPass.php
[F] ValidFunctionNamePass.php

Web Journal

top

Blog Section

Discover the Latest in Digital Payments and NFC Technology

Dive into our blog to explore the cutting-edge trends in digital payments and NFC technology. Stay updated on the innovations that are revolutionizing transactions, boosting security, and making payments quicker and more convenient. Learn how these advancements are shaping the future of financial interactions and driving the global transition towards a cashless world.

The Rise of Contactless Payments:...

In recent years, contactless payments have surged in popularity, driven...

Enhancing Payment Security: The Role...

As digital transactions proliferate, ensuring robust payment security is more critical than ever. Two foundational...

The Future of Digital Wallets:...

Digital wallets have fundamentally transformed how we manage money, offering a streamlined, secure, and highly...

Discover the Latest in Digital Payments and NFC Technology

The Rise of Contactless Payments:...

Enhancing Payment Security: The Role...

The Future of Digital Wallets:...

Useful Links

Subscribe