class Coverage

final class Coverage {
    private readonly XMLWriter $writer;
    private readonly DOMElement $contextNode;
    private bool $finalized = false;
    public function __construct(DOMElement $context, string $line) {
        $this->contextNode = $context;
        $this->writer = new XMLWriter();
        $this->writer
            ->openMemory();
        $this->writer
            ->startElementNS(null, $context->nodeName, 'https://schema.phpunit.de/coverage/1.0');
        $this->writer
            ->writeAttribute('nr', $line);
    }
    
    /**
     * @throws ReportAlreadyFinalizedException
     */
    public function addTest(string $test) : void {
        if ($this->finalized) {
            throw new ReportAlreadyFinalizedException();
        }
        $this->writer
            ->startElement('covered');
        $this->writer
            ->writeAttribute('by', $test);
        $this->writer
            ->endElement();
    }
    public function finalize() : void {
        $this->writer
            ->endElement();
        $fragment = $this->contextNode->ownerDocument
            ->createDocumentFragment();
        $fragment->appendXML($this->writer
            ->outputMemory());
        $this->contextNode->parentNode
            ->replaceChild($fragment, $this->contextNode);
        $this->finalized = true;
    }

}