Add snake_case filter - Close #14

Author: sandrokeil

src/FilterFactory.php

@@ -41,6 +41,14 @@ public static function normalizeFilter(callable ...$callables): callable
         return $filter;
     }
 
+    public static function snakeCaseFilter(): callable
+    {
+        return self::normalizeFilter(
+            new Filter\Word\CamelCaseToUnderscore(),
+            new Filter\StringToLower()
+        );
+    }
+
     /**
      * Returns a filter for valid class names e.g. AddBuilding
      *

tests/FilterFactoryTest.php

@@ -25,6 +25,17 @@ public function providerForLabel(): Generator
         yield 'html' => ['Add Building<hr id="null"><div style="text-align: left;">- buildingId: string</div><div style="text-align: left;">- name: string</div>'];
     }
 
+    /**
+     * @test
+     * @dataProvider providerForLabel
+     * @param string $label
+     */
+    public function it_filters_snake_case(string $label): void
+    {
+        $filter = FilterFactory::snakeCaseFilter();
+        $this->assertSame('add_building', ($filter)($label));
+    }
+
     /**
      * @test
      * @dataProvider providerForLabel