/**
* @param MapInterface<int, NodeInterface> $nodes
*/
public function __invoke(MapInterface $nodes) : NodeInterface
{
if ((string) $nodes->keyType() !== 'int' || (string) $nodes->valueType() !== NodeInterface::class) {
throw new InvalidArgumentException();
}
if ($nodes->size() === 1) {
if (!$nodes->current()->hasChildren()) {
return $nodes->current();
}
try {
return $this($nodes->current()->children());
} catch (ContentTooDispersedException $e) {
return $nodes->current();
}
}
$dispersion = $nodes->reduce([], function (array $dispersion, int $position, NodeInterface $node) : array {
$text = (new Text())($node);
$text = new Str($text);
$dispersion[$position] = $text->wordCount();
return $dispersion;
});
$quantile = new Quantile($dispersion);
$lookup = [];
//select qartiles that have more words than the average nodes
for ($i = 1; $i < 5; $i++) {
$diff = $quantile->quartile($i)->value() - $quantile->quartile($i - 1)->value();
if ($diff >= $quantile->mean()) {
$lookup[] = $i;
}
}
if (empty($lookup)) {
throw new ContentTooDispersedException();
}
//select the minimum amount of words that needs to be in nodes
$min = $quantile->quartile(min($lookup))->value();
$nodes = $nodes->filter(function (int $position) use($min, $dispersion) : bool {
return $dispersion[$position] >= $min;
});
return $this($nodes);
}
/**
* @expectedException InvalidArgumentException
* @expectedExceptionMessage Unknown quartile 6
*/
public function testThrowWhenAccessingUnknownQuartile()
{
$q = new Quantile([1, 2, 3]);
$q->quartile(6);
}