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<?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.
*/
namespace Twig\Extra\Html\HtmlAttr;
use Twig\Error\RuntimeError;
/**
* @author Matthias Pigulla <mp@webfactory.de>
*/
final class SeparatedTokenList implements AttributeValueInterface, MergeableInterface
{
private readonly array $value;
public function __construct(mixed $value, private readonly string $separator = ' ')
{
if (is_iterable($value)) {
$this->value = [...$value];
} elseif (\is_scalar($value)) {
$this->value = [$value];
} else {
throw new RuntimeError('SeparatedTokenList can only be constructed from iterable or scalar values.');
}
}
public function mergeInto(mixed $previous): mixed
{
if ($previous instanceof self && $previous->separator === $this->separator) {
return new self([...$previous->value, ...$this->value], $this->separator);
}
if (is_iterable($previous)) {
return new self([...$previous, ...$this->value], $this->separator);
}
throw new RuntimeError('SeparatedTokenList can only be merged with iterables or other SeparatedTokenList instances using the same separator.');
}
public function appendFrom(mixed $newValue): mixed
{
if (!is_iterable($newValue)) {
throw new RuntimeError('Only iterable values can be appended to SeparatedTokenList.');
}
return new self([...$this->value, ...$newValue], $this->separator);
}
public function getValue(): ?string
{
$filtered = array_filter($this->value, static fn ($v) => null !== $v && false !== $v);
// Omit attribute if list contains only false or null values
if (!$filtered) {
return null;
}
// true values are not printed, but result in the attribute not being omitted
return trim(implode($this->separator, array_filter($filtered, static fn ($v) => true !== $v)));
}
}
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