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<?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\EmptyNode; use Twig\Node\Expression\Binary\AndBinary; use Twig\Node\Expression\Binary\NullCoalesceBinary; use Twig\Node\Expression\Test\DefinedTest; use Twig\Node\Expression\Test\NullTest; use Twig\Node\Expression\Unary\NotUnary; use Twig\Node\Expression\Variable\ContextVariable; use Twig\Node\Node; use Twig\TwigTest; class NullCoalesceExpression extends ConditionalExpression { /** * @param AbstractExpression $left * @param AbstractExpression $right */ public function __construct(Node $left, Node $right, int $lineno) { trigger_deprecation('twig/twig', '3.17', \sprintf('"%s" is deprecated; use "%s" instead.', __CLASS__, NullCoalesceBinary::class)); if (!$left instanceof AbstractExpression) { trigger_deprecation('twig/twig', '3.15', 'Not passing a "%s" instance to the "left" argument of "%s" is deprecated ("%s" given).', AbstractExpression::class, static::class, \get_class($left)); } if (!$right instanceof AbstractExpression) { trigger_deprecation('twig/twig', '3.15', 'Not passing a "%s" instance to the "right" argument of "%s" is deprecated ("%s" given).', AbstractExpression::class, static::class, \get_class($right)); } $test = new DefinedTest(clone $left, new TwigTest('defined'), new EmptyNode(), $left->getTemplateLine()); // for "block()", we don't need the null test as the return value is always a string if (!$left instanceof BlockReferenceExpression) { $test = new AndBinary( $test, new NotUnary(new NullTest($left, new TwigTest('null'), new EmptyNode(), $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 ContextVariable) { $this->getNode('expr2')->setAttribute('always_defined', true); $compiler ->raw('((') ->subcompile($this->getNode('expr2')) ->raw(') ?? (') ->subcompile($this->getNode('expr3')) ->raw('))') ; } else { parent::compile($compiler); } } }
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