class.ilMailTemplateContextAdapter.php

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<?php

declare(strict_types=1);

class ilMailTemplateContextAdapter
{
    public function __construct(
        protected array $contexts,
        protected array $context_parameter,
        protected readonly Mustache_Engine $mustache_engine,
        protected ?ilObjUser $recipient = null
    ) {
    }

    public function withContext(ilMailTemplateContext $context): self
    {
        $clone = clone $this;
        $clone->contexts[] = $context;
        return $clone;
    }

    public function __isset(string $name): bool
    {
        foreach ($this->contexts as $context) {
            $possible_placeholder = array_map(
                static function ($placeholder): string {
                    return strtoupper($placeholder);
                },
                array_keys($context->getPlaceholders())
            );
            if (in_array($name, $possible_placeholder, true)) {
                return true;
            }
        }

        return false;
    }

    public function __get(string $name): string
    {
        foreach ($this->contexts as $context) {
            $ret = $context->resolvePlaceholder($name, $this->context_parameter, $this->recipient);
            if (in_array($name, $context->getNestedPlaceholders(), true)) {
                $ret = $this->mustache_engine->render($ret, $this);
            }
            if ($ret !== '') {
                return $ret;
            }
        }

        return '';
    }
}