Pass structure to query visitor & enable range generation for regular fields (equal expression)

lib/Alchemy/Phrasea/SearchEngine/Elastic/Search/QueryContextFactory.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace Alchemy\Phrasea\SearchEngine\Elastic\Search;
+
+use Alchemy\Phrasea\SearchEngine\Elastic\Structure\LimitedStructure;
+use Alchemy\Phrasea\SearchEngine\Elastic\Structure\Structure;
+use Alchemy\Phrasea\SearchEngine\SearchEngineOptions;
+
+class QueryContextFactory
+{
+    private $structure;
+
+    public function __construct(Structure $structure, array $locales, $current_locale)
+    {
+        $this->structure = $structure;
+        $this->locales = $locales;
+        $this->current_locale = $current_locale;
+    }
+
+    public function createContext(SearchEngineOptions $options = null)
+    {
+        $structure = $options
+            ? $this->getLimitedStructure($options)
+            : $this->structure;
+
+        $context = new QueryContext($structure, $this->locales, $this->current_locale);
+
+        if ($options) {
+            $fields = $this->getSearchedFields($options);
+            $context = $context->narrowToFields($fields);
+        }
+
+        return $context;
+    }
+
+    private function getSearchedFields(SearchEngineOptions $options)
+    {
+        $fields = [];
+        foreach ($options->getFields() as $field) {
+            $fields[] = $field->get_name();
+        }
+        return $fields;
+    }
+
+    public function getLimitedStructure(SearchEngineOptions $options)
+    {
+        return new LimitedStructure($this->structure, $options);
+    }
+}