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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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/*
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 * This file is part of Psy Shell.
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 *
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 * (c) 2012-2023 Justin Hileman
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 *
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 * For the full copyright and license information, please view the LICENSE
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 * file that was distributed with this source code.
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 */
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namespace Psy\CodeCleaner;
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use PhpParser\Node;
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use PhpParser\Node\FunctionLike;
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use PhpParser\Node\Stmt\Goto_;
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use PhpParser\Node\Stmt\Label;
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use Psy\Exception\FatalErrorException;
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/**
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 * CodeCleanerPass for label context.
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 *
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 * This class partially emulates the PHP label specification.
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 * PsySH can not declare labels by sequentially executing lines with eval,
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 * but since it is not a syntax error, no error is raised.
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 * This class warns before invalid goto causes a fatal error.
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 * Since this is a simple checker, it does not block real fatal error
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 * with complex syntax.  (ex. it does not parse inside function.)
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 *
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 * @see http://php.net/goto
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 */
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class LabelContextPass extends CodeCleanerPass
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{
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    /** @var int */
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    private $functionDepth;
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    /** @var array */
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    private $labelDeclarations;
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    /** @var array */
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    private $labelGotos;
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    /**
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     * @param array $nodes
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     *
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     * @return Node[]|null Array of nodes
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     */
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    public function beforeTraverse(array $nodes)
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    {
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        $this->functionDepth = 0;
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        $this->labelDeclarations = [];
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        $this->labelGotos = [];
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    }
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    /**
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     * @return int|Node|null Replacement node (or special return value)
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     */
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    public function enterNode(Node $node)
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    {
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        if ($node instanceof FunctionLike) {
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            $this->functionDepth++;
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            return;
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        }
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        // node is inside function context
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        if ($this->functionDepth !== 0) {
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            return;
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        }
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        if ($node instanceof Goto_) {
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            $this->labelGotos[\strtolower($node->name)] = $node->getLine();
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        } elseif ($node instanceof Label) {
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            $this->labelDeclarations[\strtolower($node->name)] = $node->getLine();
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        }
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    }
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    /**
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     * @param \PhpParser\Node $node
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     *
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     * @return int|Node|Node[]|null Replacement node (or special return value)
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     */
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    public function leaveNode(Node $node)
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    {
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        if ($node instanceof FunctionLike) {
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            $this->functionDepth--;
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        }
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    }
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    /**
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     * @return Node[]|null Array of nodes
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     */
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    public function afterTraverse(array $nodes)
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    {
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        foreach ($this->labelGotos as $name => $line) {
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            if (!isset($this->labelDeclarations[$name])) {
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                $msg = "'goto' to undefined label '{$name}'";
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                throw new FatalErrorException($msg, 0, \E_ERROR, null, $line);
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            }
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        }
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    }
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}