nystudio107 / craft-emptycoalesce

src/Node/Expression/EmptyCoalesceExpression.php

<?php
/**
 * Empty Coalesce plugin for Craft CMS 3.x
 *
 * Empty Coalesce adds the ??? operator to Twig that will return the first thing
 * that is defined, not null, and not empty.
 *
 * @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;

use Twig\Compiler;
use Twig\Node\Expression\AbstractExpression;
use Twig\Node\Node;

/**

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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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class EmptyCoalesceExpression extends AbstractExpression
{
    /**
     * Checks if a variable is empty.
     *
     *    {# evaluates to true if the foo variable is null, false, or the empty string #}
     *    {% if foo is empty %}
     *        {# ... #}
     *    {% endif %}
     *
     * @param mixed $value A variable
     *
     * @return bool true if the value is empty, false otherwise
     */
    public static function empty($value): bool
    {
        if ($value instanceof \Countable) {
            return 0 == \count($value);
        }

        if (\is_object($value) && method_exists($value, '__toString')) {
            return '' === (string) $value;
        }

        return '' === $value || false === $value || null === $value || [] === $value;
    }

    public function __construct(Node $left, Node $right, $lineno)

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    {
        $left->setAttribute('ignore_strict_check', true);
        $left->setAttribute('is_defined_test', false);
        $right->setAttribute('ignore_strict_check', true);
        $right->setAttribute('is_defined_test', false);
        parent::__construct(
            ['left' => $left, 'right' => $right],
            ['ignore_strict_check' => true, 'is_defined_test' => false],
            $lineno
        );
    }

    public function compile(Compiler $compiler)

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    {
        //$this->getNode('expr1')->setAttribute('always_defined', true);
        $compiler
            ->raw('((' . self::class . '::empty(')
            ->subcompile($this->getNode('left'))
            ->raw(') ? null : ')
            ->subcompile($this->getNode('left'))
            ->raw(') ?? (' . self::class . '::empty(')
            ->subcompile($this->getNode('right'))
            ->raw(') ? null : ')
            ->subcompile($this->getNode('right'))
            ->raw('))')

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        ;
    }
}