<?php declare(strict_types = 1);
namespace TheSeer\Tokenizer;

use DOMDocument;

class XMLSerializer {

/** @var \XMLWriter */
private $writer;

/** @var Token */
private $previousToken;

/** @var NamespaceUri */
private $xmlns;

/**
* XMLSerializer constructor.
*
* @param NamespaceUri $xmlns
*/
public function __construct(?NamespaceUri $xmlns = null) {
if ($xmlns === null) {
$xmlns = new NamespaceUri('https://github.com/theseer/tokenizer');
}
$this->xmlns = $xmlns;
}

public function toDom(TokenCollection $tokens): DOMDocument {
$dom = new DOMDocument();
$dom->preserveWhiteSpace = false;
$dom->loadXML($this->toXML($tokens));

return $dom;
}

public function toXML(TokenCollection $tokens): string {
$this->writer = new \XMLWriter();
$this->writer->openMemory();
$this->writer->setIndent(true);
$this->writer->startDocument();
$this->writer->startElement('source');
$this->writer->writeAttribute('xmlns', $this->xmlns->asString());

if (\count($tokens) > 0) {
$this->writer->startElement('line');
$this->writer->writeAttribute('no', '1');

$this->previousToken = $tokens[0];

foreach ($tokens as $token) {
$this->addToken($token);
}
}

$this->writer->endElement();
$this->writer->endElement();
$this->writer->endDocument();

return $this->writer->outputMemory();
}

private function addToken(Token $token): void {
if ($this->previousToken->getLine() < $token->getLine()) {
$this->writer->endElement();

$this->writer->startElement('line');
$this->writer->writeAttribute('no', (string)$token->getLine());
$this->previousToken = $token;
}

if ($token->getValue() !== '') {
$this->writer->startElement('token');
$this->writer->writeAttribute('name', $token->getName());
$this->writer->writeRaw(\htmlspecialchars($token->getValue(), \ENT_NOQUOTES | \ENT_DISALLOWED | \ENT_XML1));
$this->writer->endElement();
}
}
}