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(), ); } $this->setNode('test', $test); } else { $left->setAttribute('always_defined', true); } } 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->hasNode('test')) { $compiler ->raw('((') ->subcompile($this->getNode('test')) ->raw(') ? (') ->subcompile($this->getNode('left')) ->raw(') : (') ->subcompile($this->getNode('right')) ->raw('))') ; return; } parent::compile($compiler); } public function operator(Compiler $compiler): Compiler { return $compiler->raw('??'); } public function getOperandNamesToEscape(): array { return $this->hasNode('test') ? ['left', 'right'] : ['right']; } }