function NullCoalesceExpression::compile

Overrides ConditionalExpression::compile

File

vendor/twig/twig/src/Node/Expression/NullCoalesceExpression.php, line 51

Class

NullCoalesceExpression

Namespace

Twig\Node\Expression

Code

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 NameExpression) {
        $this->getNode('expr2')
            ->setAttribute('always_defined', true);
        $compiler->raw('((')
            ->subcompile($this->getNode('expr2'))
            ->raw(') ?? (')
            ->subcompile($this->getNode('expr3'))
            ->raw('))');
    }
    else {
        parent::compile($compiler);
    }
}