feat(query): add span first query

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: Spamercz

doc/02-query-objects.md

@@ -601,6 +601,19 @@ new \Spameri\ElasticQuery\Query\Script(
 
 Positional matching — useful for term-position-aware searches. Span clauses can be composed via the `*_near`, `*_or`, etc. queries.
 
+##### SpanFirst Query
+Match a span only if it appears within the first N positions.
+- Class: `\Spameri\ElasticQuery\Query\SpanFirst`
+- [Documentation](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-span-first-query.html)
+- [Implementation](https://github.com/Spameri/ElasticQuery/blob/master/src/Query/SpanFirst.php)
+
+```php
+new \Spameri\ElasticQuery\Query\SpanFirst(
+	match: new \Spameri\ElasticQuery\Query\SpanTerm('user', 'kimchy'),
+	end: 3,
+);
+```
+
 ##### SpanTerm Query
 Match a single term in a span-aware way.
 - Class: `\Spameri\ElasticQuery\Query\SpanTerm`

src/Query/SpanFirst.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types = 1);
+
+namespace Spameri\ElasticQuery\Query;
+
+/**
+ * @see https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-span-first-query.html
+ */
+class SpanFirst implements \Spameri\ElasticQuery\Query\LeafQueryInterface
+{
+
+	public function __construct(
+		private \Spameri\ElasticQuery\Query\LeafQueryInterface $match,
+		private int $end,
+	)
+	{
+	}
+
+
+	public function key(): string
+	{
+		return 'span_first_' . $this->match->key() . '_' . $this->end;
+	}
+
+
+	/**
+	 * @return array<string, array<string, mixed>>
+	 */
+	public function toArray(): array
+	{
+		return [
+			'span_first' => [
+				'match' => $this->match->toArray(),
+				'end' => $this->end,
+			],
+		];
+	}
+
+}

tests/SpameriTests/ElasticQuery/Query/SpanFirst.phpt

@@ -0,0 +1,64 @@
+<?php declare(strict_types = 1);
+
+namespace SpameriTests\ElasticQuery\Query;
+
+require_once __DIR__ . '/../../bootstrap.php';
+
+
+class SpanFirst extends \Tester\TestCase
+{
+
+	private const INDEX = 'spameri_test_query_span_first';
+
+
+	public function setUp(): void
+	{
+		$ch = \curl_init();
+		\curl_setopt($ch, \CURLOPT_URL, \ELASTICSEARCH_HOST . '/' . self::INDEX);
+		\curl_setopt($ch, \CURLOPT_RETURNTRANSFER, 1);
+		\curl_setopt($ch, \CURLOPT_CUSTOMREQUEST, 'PUT');
+		\curl_setopt($ch, \CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
+
+		\curl_exec($ch);
+	}
+
+
+	public function testToArray(): void
+	{
+		$span = new \Spameri\ElasticQuery\Query\SpanFirst(
+			match: new \Spameri\ElasticQuery\Query\SpanTerm('user', 'kimchy'),
+			end: 3,
+		);
+
+		$array = $span->toArray();
+
+		\Tester\Assert::same(3, $array['span_first']['end']);
+		\Tester\Assert::true(isset($array['span_first']['match']['span_term']));
+	}
+
+
+	public function testKey(): void
+	{
+		$span = new \Spameri\ElasticQuery\Query\SpanFirst(
+			new \Spameri\ElasticQuery\Query\SpanTerm('user', 'kimchy'),
+			3,
+		);
+
+		\Tester\Assert::same('span_first_span_term_user_kimchy_3', $span->key());
+	}
+
+
+	public function tearDown(): void
+	{
+		$ch = \curl_init();
+		\curl_setopt($ch, \CURLOPT_URL, \ELASTICSEARCH_HOST . '/' . self::INDEX);
+		\curl_setopt($ch, \CURLOPT_RETURNTRANSFER, 1);
+		\curl_setopt($ch, \CURLOPT_CUSTOMREQUEST, 'DELETE');
+		\curl_setopt($ch, \CURLOPT_HTTPHEADER, ['Content-Type: application/json']);
+
+		\curl_exec($ch);
+	}
+
+}
+
+(new SpanFirst())->run();