Renaming of classes, making true recursive structure

app/Support/Search/QueryParser/FieldNode.php

@@ -0,0 +1,36 @@
+<?php
+
+declare(strict_types=1);
+
+namespace FireflyIII\Support\Search\QueryParser;
+
+/**
+ * Represents a field operator with value (e.g. amount:100)
+ */
+class FieldNode extends Node
+{
+    private string $operator;
+    private string $value;
+
+    public function __construct(string $operator, string $value, bool $prohibited = false)
+    {
+        $this->operator = $operator;
+        $this->value = $value;
+        $this->prohibited = $prohibited;
+    }
+
+    public function getOperator(): string
+    {
+        return $this->operator;
+    }
+
+    public function getValue(): string
+    {
+        return $this->value;
+    }
+
+    public function __toString(): string
+    {
+        return ($this->prohibited ? '-' : '') . $this->operator . ':' . $this->value;
+    }
+}