Add from, range, filter functions to QueryBuilder

Signed-off-by: davidarendsen <davidarendsen@hey.com>

src/Function/Filter.php

@@ -2,21 +2,23 @@
 
 namespace Arendsen\FluxQueryBuilder\Function;
 
+use Arendsen\FluxQueryBuilder\Expression\KeyValue;
+
 class Filter extends Base {
 
     /**
-     * @var array $settings
+     * @var KeyValue $keyValue
      */
-    private $settings;
+    private $keyValue;
 
-    public function __construct(array $settings)
+    public function __construct(KeyValue $keyValue)
     {
-        $this->settings = $settings;
+        $this->keyValue = $keyValue;
     }
 
     public function __toString()
     {
-        return '|> filter(fn: (r) => ' . implode(' ', $this->settings) . ') ';
+        return '|> filter(fn: (r) => ' . $this->keyValue . ') ';
     }
 
 }

src/Function/Range.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Function;
+
+class Range extends Base {
+
+    /**
+     * @var array $settings
+     */
+    private $settings;
+
+    public function __construct(array $settings)
+    {
+        $this->settings = $settings;
+    }
+
+    public function __toString()
+    {
+        return '|> range(' . implode(', ', $this->format($this->settings)) . ') ';
+    }
+
+    protected function format(array $settings)
+    {
+        array_walk($settings, function(&$value, $key) {
+			$value = $key . ': ' . (is_string($value) ? '"' . $value . '"' : $value);
+		});
+
+        return $settings;
+    }
+
+}