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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 WPML\Core\Twig\Node\Expression; use WPML\Core\Twig\Compiler; use WPML\Core\Twig\Node\Expression\Binary\AndBinary; use WPML\Core\Twig\Node\Expression\Test\DefinedTest; use WPML\Core\Twig\Node\Expression\Test\NullTest; use WPML\Core\Twig\Node\Expression\Unary\NotUnary; use WPML\Core\Twig\Node\Node; class NullCoalesceExpression extends \WPML\Core\Twig\Node\Expression\ConditionalExpression { public function __construct(\WPML\Core\Twig_NodeInterface $left, \WPML\Core\Twig_NodeInterface $right, $lineno) { $test = new \WPML\Core\Twig\Node\Expression\Test\DefinedTest(clone $left, 'defined', new \WPML\Core\Twig\Node\Node(), $left->getTemplateLine()); // for "block()", we don't need the null test as the return value is always a string if (!$left instanceof \WPML\Core\Twig\Node\Expression\BlockReferenceExpression) { $test = new \WPML\Core\Twig\Node\Expression\Binary\AndBinary($test, new \WPML\Core\Twig\Node\Expression\Unary\NotUnary(new \WPML\Core\Twig\Node\Expression\Test\NullTest($left, 'null', new \WPML\Core\Twig\Node\Node(), $left->getTemplateLine()), $left->getTemplateLine()), $left->getTemplateLine()); } parent::__construct($test, $left, $right, $lineno); } public function compile(\WPML\Core\Twig\Compiler $compiler) { /* * This optimizes only one case. PHP 7 also supports more complex expressions * that can return null. So, for instance, if log is defined, log("foo") ?? "..." works, * but log($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 (\PHP_VERSION_ID >= 70000 && $this->getNode('expr2') instanceof \WPML\Core\Twig\Node\Expression\NameExpression) { $this->getNode('expr2')->setAttribute('always_defined', \true); $compiler->raw('((')->subcompile($this->getNode('expr2'))->raw(') ?? (')->subcompile($this->getNode('expr3'))->raw('))'); } else { parent::compile($compiler); } } } \class_alias('WPML\\Core\\Twig\\Node\\Expression\\NullCoalesceExpression', 'WPML\\Core\\Twig_Node_Expression_NullCoalesce');
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