public function parse(\DOMNode $node)
{
$this->doc = $node->ownerDocument;
$sequence = [];
$sequence = $this->parseHead($sequence, $node);
$sequence = $this->parseBeginning($sequence, $node);
// detail rows contain all the tagged stuff (be extra strict with selecting those, as they can contain
// a lot of different markup)
$detailsRows = $this->xpath($node, 'tr[5]/td/table/tr');
assert(count($detailsRows) > 0, 'sequence must have at least one detail row');
foreach ($detailsRows as $detailsRow) {
$type = strtolower($this->text($detailsRow, 'td[2]/font', 1, true));
$lineNodes = $this->xpath($detailsRow, 'td[3]//tt');
$lines = [];
foreach ($lineNodes as $lineNode) {
$html = $this->toHTML($lineNode);
// trim the surrounding <tt> tag
$html = preg_replace('#^<tt>(.*?)</tt>$#', '$1', $html);
$lines[] = ['text' => $this->toText($lineNode), 'html' => $html, 'node' => $lineNode];
}
// just in case we hit something that has no valid lines
if (count($lines) > 0) {
switch ($type) {
case 'offset':
$sequence = $this->parseOffset($sequence, $lines);
break;
case 'status':
$sequence = $this->parseStatus($sequence, $lines);
break;
case 'author':
$sequence = $this->parseAuthor($sequence, $lines);
break;
case 'keyword':
$sequence = $this->parseKeyword($sequence, $lines);
break;
case 'comments':
$sequence = $this->parseComments($sequence, $lines);
break;
case 'references':
$sequence = $this->parseReferences($sequence, $lines);
break;
case 'links':
$sequence = $this->parseLinks($sequence, $lines);
break;
case 'formula':
$sequence = $this->parseFormula($sequence, $lines);
break;
case 'example':
$sequence = $this->parseExample($sequence, $lines);
break;
case 'maple':
$sequence = $this->parseProgram($sequence, $lines, 'maple');
break;
case 'mathematica':
$sequence = $this->parseProgram($sequence, $lines, 'mathematica');
break;
case 'prog':
$sequence = $this->parseProgram($sequence, $lines, 'other');
break;
case 'crossrefs':
$sequence = $this->parseCrossrefs($sequence, $lines);
break;
case 'extensions':
$sequence = $this->parseExtensions($sequence, $lines);
break;
default:
trigger_error("Unknown {$type} found in {$sequence['identification']}[OEIS].", E_USER_WARNING);
$sequence['junk'][$type] = $lines;
}
}
}
$sequence = new Sequence($sequence);
// backup, in case we improve parsing later on and want to skip crawling everything again
$sequence->setRawHTML($this->toHTML($node));
return $sequence;
}
