mirror of
https://github.com/vichan-devel/vichan.git
synced 2024-12-22 12:25:59 +01:00
49 lines
1.9 KiB
PHP
49 lines
1.9 KiB
PHP
|
<?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.
|
||
|
|
*/
|
||
|
|
class Twig_Node_Expression_NullCoalesce extends Twig_Node_Expression_Conditional
|
||
|
|
{
|
||
|
|
public function __construct(Twig_NodeInterface $left, Twig_NodeInterface $right, $lineno)
|
||
|
|
{
|
||
|
|
$test = new Twig_Node_Expression_Binary_And(
|
||
|
|
new Twig_Node_Expression_Test_Defined(clone $left, 'defined', new Twig_Node(), $left->getTemplateLine()),
|
||
|
|
new Twig_Node_Expression_Unary_Not(new Twig_Node_Expression_Test_Null($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);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
class_alias('Twig_Node_Expression_NullCoalesce', 'Twig\Node\Expression\NullCoalesceExpression', false);
|