getTemplateLine()), new Twig_Node_Expression_Unary_Not(new Twig_Node_Expression_Test_Null($left, 'null', new Twig_Node(), $left->getTemplateLine()), $left->getTemplateLine()), $left->getTemplateLine() ); parent::__construct($test, $left, $right, $lineno); } public function compile(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 Twig_Node_Expression_Name) { $this->getNode('expr2')->setAttribute('always_defined', true); $compiler ->raw('((') ->subcompile($this->getNode('expr2')) ->raw(') ?? (') ->subcompile($this->getNode('expr3')) ->raw('))') ; } else { parent::compile($compiler); } } }