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<?php |
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/** |
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* Empty Coalesce plugin for Craft CMS 3.x |
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* |
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* Empty Coalesce adds the ??? operator to Twig that will return the first thing |
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* that is defined, not null, and not empty. |
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* |
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* @link https://nystudio107.com/ |
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* @copyright Copyright (c) 2018 nystudio107 |
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*/ |
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namespace nystudio107\emptycoalesce\Node\Expression; |
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use Twig\Compiler; |
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use Twig\Node\Expression\AbstractExpression; |
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use Twig\Node\Node; |
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/** |
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* @author nystudio107 |
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* @package EmptyCoalesce |
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* @since 1.0.0 |
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* |
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*/ |
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class EmptyCoalesceExpression extends AbstractExpression |
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{ |
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/** |
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* Checks if a variable is empty. |
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* |
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* {# evaluates to true if the foo variable is null, false, or the empty string #} |
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* {% if foo is empty %} |
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* {# ... #} |
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* {% endif %} |
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* |
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* @param mixed $value A variable |
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* |
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* @return bool true if the value is empty, false otherwise |
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*/ |
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public static function empty($value): bool |
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{ |
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if ($value instanceof \Countable) { |
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return 0 == \count($value); |
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} |
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if (\is_object($value) && method_exists($value, '__toString')) { |
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return '' === (string) $value; |
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} |
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return '' === $value || false === $value || null === $value || [] === $value; |
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} |
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public function __construct(Node $left, Node $right, $lineno) |
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{ |
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$left->setAttribute('ignore_strict_check', true); |
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$left->setAttribute('is_defined_test', false); |
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$right->setAttribute('ignore_strict_check', true); |
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$right->setAttribute('is_defined_test', false); |
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parent::__construct( |
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['left' => $left, 'right' => $right], |
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['ignore_strict_check' => true, 'is_defined_test' => false], |
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$lineno |
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); |
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} |
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public function compile(Compiler $compiler) |
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{ |
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//$this->getNode('expr1')->setAttribute('always_defined', true); |
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$compiler |
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->raw('(('.self::class.'::empty(') |
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->subcompile($this->getNode('left')) |
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->raw(') ? null : ') |
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->subcompile($this->getNode('left')) |
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->raw(') ?? ('.self::class.'::empty(') |
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->subcompile($this->getNode('right')) |
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->raw(') ? null : ') |
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->subcompile($this->getNode('right')) |
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->raw('))') |
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; |
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} |
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} |
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class_alias('nystudio107\emptycoalesce\Node\Expression\EmptyCoalesceExpression', 'Twig_Node_Expression_EmptyCoalesce'); |
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nystudio107 /
craft-emptycoalesce
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