Add antlers modifier (#6489)

src/Modifiers/CoreModifiers.php

@@ -102,6 +102,18 @@ public function ampersandList($value, $params)
         return Str::makeSentenceList($value, $glue, $oxford_comma);
     }
 
+    /**
+     * Parses the value as an Antlers template.
+     *
+     * @param  mixed  $value
+     * @param  array  $params
+     * @return string
+     */
+    public function antlers($value, $params, $context)
+    {
+        return (string) Antlers::parse($value, $context);
+    }
+
     /**
      * Alias an array variable.
      *

tests/Modifiers/AntlersTest.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Tests\Modifiers;
+
+use Statamic\Modifiers\Modify;
+use Tests\TestCase;
+
+class AntlersTest extends TestCase
+{
+    /** @test */
+    public function it_parses_as_antlers(): void
+    {
+        $modified = $this->modify('foo {{ foo }} bar {{ bar }}', ['foo' => 'alfa', 'bar' => 'bravo']);
+        $this->assertEquals('foo alfa bar bravo', $modified);
+    }
+
+    private function modify($value, array $context = [])
+    {
+        return Modify::value($value)->context($context)->antlers()->fetch();
+    }
+}