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Edit File : ListPass.php \| Size : 3.21 KB
<?php /* * This file is part of Psy Shell. * * (c) 2012-2018 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\Array_; use PhpParser\Node\Expr\ArrayDimFetch; use PhpParser\Node\Expr\ArrayItem; use PhpParser\Node\Expr\Assign; use PhpParser\Node\Expr\FuncCall; use PhpParser\Node\Expr\List_; use PhpParser\Node\Expr\MethodCall; use PhpParser\Node\Expr\PropertyFetch; use PhpParser\Node\Expr\Variable; use Psy\Exception\ParseErrorException; /* * Validate that the list assignment. / class ListPass extends CodeCleanerPass { private $atLeastPhp71; public function __construct() { $this->atLeastPhp71 = \version_compare(PHP_VERSION, '7.1', '>='); } /* * Validate use of list assignment. * * @throws ParseErrorException if the user used empty with anything but a variable * * @param Node $node / public function enterNode(Node $node) { if (!$node instanceof Assign) { return; } if (!$node->var instanceof Array_ && !$node->var instanceof List_) { return; } if (!$this->atLeastPhp71 && $node->var instanceof Array_) { $msg = "syntax error, unexpected '='"; throw new ParseErrorException($msg, $node->expr->getLine()); } // Polyfill for PHP-Parser 2.x $items = isset($node->var->items) ? $node->var->items : $node->var->vars; if ($items === [] \|\| $items === [null]) { throw new ParseErrorException('Cannot use empty list', $node->var->getLine()); } $itemFound = false; foreach ($items as $item) { if ($item === null) { continue; } $itemFound = true; // List_->$vars in PHP-Parser 2.x is Variable instead of ArrayItem. if (!$this->atLeastPhp71 && $item instanceof ArrayItem && $item->key !== null) { $msg = 'Syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting \',\' or \')\''; throw new ParseErrorException($msg, $item->key->getLine()); } if (!self::isValidArrayItem($item)) { $msg = 'Assignments can only happen to writable values'; throw new ParseErrorException($msg, $item->getLine()); } } if (!$itemFound) { throw new ParseErrorException('Cannot use empty list'); } } /* * Validate whether a given item in an array is valid for short assignment. * * @param Expr $item * * @return bool */ private static function isValidArrayItem(Expr $item) { $value = ($item instanceof ArrayItem) ? $item->value : $item; while ($value instanceof ArrayDimFetch \|\| $value instanceof PropertyFetch) { $value = $value->var; } // We just kind of give up if it's a method call. We can't tell if it's // valid via static analysis. return $value instanceof Variable \|\| $value instanceof MethodCall \|\| $value instanceof FuncCall; } } Back

Edit File : ListPass.php | Size : 3.21 KB

<?php

/*
 * This file is part of Psy Shell.
 *
 * (c) 2012-2018 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\Array_;
use PhpParser\Node\Expr\ArrayDimFetch;
use PhpParser\Node\Expr\ArrayItem;
use PhpParser\Node\Expr\Assign;
use PhpParser\Node\Expr\FuncCall;
use PhpParser\Node\Expr\List_;
use PhpParser\Node\Expr\MethodCall;
use PhpParser\Node\Expr\PropertyFetch;
use PhpParser\Node\Expr\Variable;
use Psy\Exception\ParseErrorException;

/**
 * Validate that the list assignment.
 */
class ListPass extends CodeCleanerPass
{
    private $atLeastPhp71;

public function __construct()
    {
        $this->atLeastPhp71 = \version_compare(PHP_VERSION, '7.1', '>=');
    }

/**
     * Validate use of list assignment.
     *
     * @throws ParseErrorException if the user used empty with anything but a variable
     *
     * @param Node $node
     */
    public function enterNode(Node $node)
    {
        if (!$node instanceof Assign) {
            return;
        }

if (!$node->var instanceof Array_ && !$node->var instanceof List_) {
            return;
        }

if (!$this->atLeastPhp71 && $node->var instanceof Array_) {
            $msg = "syntax error, unexpected '='";
            throw new ParseErrorException($msg, $node->expr->getLine());
        }

// Polyfill for PHP-Parser 2.x
        $items = isset($node->var->items) ? $node->var->items : $node->var->vars;

if ($items === [] || $items === [null]) {
            throw new ParseErrorException('Cannot use empty list', $node->var->getLine());
        }

$itemFound = false;
        foreach ($items as $item) {
            if ($item === null) {
                continue;
            }

$itemFound = true;

// List_->$vars in PHP-Parser 2.x is Variable instead of ArrayItem.
            if (!$this->atLeastPhp71 && $item instanceof ArrayItem && $item->key !== null) {
                $msg = 'Syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting \',\' or \')\'';
                throw new ParseErrorException($msg, $item->key->getLine());
            }

if (!self::isValidArrayItem($item)) {
                $msg = 'Assignments can only happen to writable values';
                throw new ParseErrorException($msg, $item->getLine());
            }
        }

if (!$itemFound) {
            throw new ParseErrorException('Cannot use empty list');
        }
    }

/**
     * Validate whether a given item in an array is valid for short assignment.
     *
     * @param Expr $item
     *
     * @return bool
     */
    private static function isValidArrayItem(Expr $item)
    {
        $value = ($item instanceof ArrayItem) ? $item->value : $item;

while ($value instanceof ArrayDimFetch || $value instanceof PropertyFetch) {
            $value = $value->var;
        }

// We just kind of give up if it's a method call. We can't tell if it's
        // valid via static analysis.
        return $value instanceof Variable || $value instanceof MethodCall || $value instanceof FuncCall;
    }
}

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