Indexer.php

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<?php
 
namespace Depage\XmlDb;

class Indexer
{
    protected XmlDb $xmlDb;

    public function __construct(XmlDb $xmlDb)
    {
        $this->xmlDb = $xmlDb;
    }

    public function query(string $xpath, ?int $docId = null): array
    {
        [$elementXpath, $attrName] = $this->splitAttribute($xpath);
 
        $nodeIds = $this->xmlDb->getNodeIdsByXpath($elementXpath, $docId);
        $nodeIds = is_array($nodeIds) ? $nodeIds : [];
 
        if (empty($nodeIds)) {
            return [];
        }
 
        $nodeData = $this->xmlDb->getIndexNodeData($nodeIds);
 
        $texts = null;
        if (is_null($attrName)) {
            $texts = $this->xmlDb->getIndexTextContent($nodeIds);
        }
 
        $results = [];
 
        foreach ($nodeIds as $nodeId) {
            if (!isset($nodeData[$nodeId])) {
                continue;
            }
            $attributes = $nodeData[$nodeId]['attributes'];
 
            $lang = $attributes['lang'] ?? null;
 
            if (is_null($attrName)) {
                $value = $texts[$nodeId] ?? '';
            } else {
                // a missing attribute yields no result at all
                if (!isset($attributes[$attrName])) {
                    continue;
                }
 
                $value = $attributes[$attrName];
            }
 
            $results[] = new IndexerResult(
                $nodeData[$nodeId]['doc_id'],
                $nodeId,
                $lang,
                $value,
            );
        }
 
        return $results;
    }

    protected function splitAttribute(string $xpath): array
    {
        $attrName = null;
        $elementXpath = $xpath;
 
        // a trailing "/@name" reference (preceded by '/', at the end of the
        // path) targets the attribute; the remaining path is the element
        if (preg_match('/^(.+?)\/@([\w\-.:]+)(?:\‍[[^\‍]]*\‍])?\s*$/', $xpath, $matches)) {
            $attrName = $matches[2];
            $elementXpath = $matches[1];
        }
 
        return [$elementXpath, $attrName];
    }
}
 
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