<?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;
}

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

return $dom;
}

/**
* @param TokenCollection $tokens
*
* @return string
*/
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());
$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();
}

/**
* @param Token $token
*/
private function addToken(Token $token) {
if ($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();
}
}
}