Gecko [ gandhischool.edu.np ]

Name	Size	Permission
Binary	[ DIR ]	drwxr-xr-x
Filter	[ DIR ]	drwxr-xr-x
Test	[ DIR ]	drwxr-xr-x
Unary	[ DIR ]	drwxr-xr-x
AbstractExpression.php	452 B	-rw-r--r--
ArrayExpression.php	2.21 KB	-rw-r--r--
ArrowFunctionExpression.php	1.54 KB	-rw-r--r--
AssignNameExpression.php	529 B	-rw-r--r--
BlockReferenceExpression.php	2.25 KB	-rw-r--r--
CallExpression.php	12.18 KB	-rw-r--r--
ConditionalExpression.php	922 B	-rw-r--r--
ConstantExpression.php	583 B	-rw-r--r--
FilterExpression.php	1.26 KB	-rw-r--r--
FunctionExpression.php	1.34 KB	-rw-r--r--
GetAttrExpression.php	2.72 KB	-rw-r--r--
InlinePrint.php	677 B	-rw-r--r--
MethodCallExpression.php	1.74 KB	-rw-r--r--
NameExpression.php	2.9 KB	-rw-r--r--
NullCoalesceExpression.php	2.05 KB	-rw-r--r--
ParentExpression.php	1.13 KB	-rw-r--r--
TempNameExpression.php	632 B	-rw-r--r--
TestExpression.php	1.09 KB	-rw-r--r--
VariadicExpression.php	442 B	-rw-r--r--

Code Editor : NullCoalesceExpression.php

<?php

/*
 * This file is part of Twig.
 *
 * (c) Fabien Potencier
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Twig\Node\Expression;

use Twig\Compiler;
use Twig\Node\Expression\Binary\AndBinary;
use Twig\Node\Expression\Test\DefinedTest;
use Twig\Node\Expression\Test\NullTest;
use Twig\Node\Expression\Unary\NotUnary;
use Twig\Node\Node;

class NullCoalesceExpression extends ConditionalExpression
{
    public function __construct(Node $left, Node $right, int $lineno)
    {
        $test = new DefinedTest(clone $left, 'defined', new Node(), $left->getTemplateLine());
        // for "block()", we don't need the null test as the return value is always a string
        if (!$left instanceof BlockReferenceExpression) {
            $test = new AndBinary(
                $test,
                new NotUnary(new NullTest($left, 'null', new Node(), $left->getTemplateLine()), $left->getTemplateLine()),
                $left->getTemplateLine()
            );
        }

parent::__construct($test, $left, $right, $lineno);
    }

public function compile(Compiler $compiler): void
    {
        /*
         * This optimizes only one case. PHP 7 also supports more complex expressions
         * that can return null. So, for instance, if log is defined, log("foo") ?? "..." works,
         * but log($a["foo"]) ?? "..." does not if $a["foo"] is not defined. More advanced
         * cases might be implemented as an optimizer node visitor, but has not been done
         * as benefits are probably not worth the added complexity.
         */
        if ($this->getNode('expr2') instanceof NameExpression) {
            $this->getNode('expr2')->setAttribute('always_defined', true);
            $compiler
                ->raw('((')
                ->subcompile($this->getNode('expr2'))
                ->raw(') ?? (')
                ->subcompile($this->getNode('expr3'))
                ->raw('))')
            ;
        } else {
            parent::compile($compiler);
        }
    }
}

${this.title}

Code Editor : NullCoalesceExpression.php