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<?php |
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|
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/* |
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* This file is part of Twig. |
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* |
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* (c) Fabien Potencier |
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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 ElementorDeps\Twig\Node\Expression; |
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|
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use ElementorDeps\Twig\Compiler; |
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use ElementorDeps\Twig\Node\Expression\Binary\AndBinary; |
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use ElementorDeps\Twig\Node\Expression\Test\DefinedTest; |
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use ElementorDeps\Twig\Node\Expression\Test\NullTest; |
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use ElementorDeps\Twig\Node\Expression\Unary\NotUnary; |
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use ElementorDeps\Twig\Node\Node; |
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class NullCoalesceExpression extends ConditionalExpression |
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{ |
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public function __construct(Node $left, Node $right, int $lineno) |
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{ |
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$test = new DefinedTest(clone $left, 'defined', new Node(), $left->getTemplateLine()); |
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// for "block()", we don't need the null test as the return value is always a string |
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if (!$left instanceof BlockReferenceExpression) { |
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$test = new AndBinary($test, new NotUnary(new NullTest($left, 'null', new Node(), $left->getTemplateLine()), $left->getTemplateLine()), $left->getTemplateLine()); |
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} |
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parent::__construct($test, $left, $right, $lineno); |
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} |
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public function compile(Compiler $compiler) : void |
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{ |
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/* |
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* This optimizes only one case. PHP 7 also supports more complex expressions |
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* that can return null. So, for instance, if log is defined, log("foo") ?? "..." works, |
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* but log($a["foo"]) ?? "..." does not if $a["foo"] is not defined. More advanced |
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* cases might be implemented as an optimizer node visitor, but has not been done |
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* as benefits are probably not worth the added complexity. |
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*/ |
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if ($this->getNode('expr2') instanceof NameExpression) { |
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$this->getNode('expr2')->setAttribute('always_defined', \true); |
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$compiler->raw('((')->subcompile($this->getNode('expr2'))->raw(') ?? (')->subcompile($this->getNode('expr3'))->raw('))'); |
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} else { |
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parent::compile($compiler); |
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} |
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} |
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} |
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