From e5714762168e9e87490bc311129877a50fed9d63 Mon Sep 17 00:00:00 2001
From: Rob Mills <robjmills@gmail.com>
Date: Thu, 20 Jan 2022 15:22:02 +0000
Subject: [PATCH] Expose registerFunction method to Less filter

---
 src/Assetic/Filter/LessphpFilter.php          | 13 ++++++++++++-
 .../Assetic/Test/Filter/LessphpFilterTest.php | 19 +++++++++++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/src/Assetic/Filter/LessphpFilter.php b/src/Assetic/Filter/LessphpFilter.php
index 0e13e30..2494aa5 100644
--- a/src/Assetic/Filter/LessphpFilter.php
+++ b/src/Assetic/Filter/LessphpFilter.php
@@ -3,6 +3,7 @@
 use Assetic\Contracts\Asset\AssetInterface;
 use Assetic\Contracts\Filter\DependencyExtractorInterface;
 use Assetic\Factory\AssetFactory;
+use Assetic\Filter\BaseFilter;
 use Assetic\Util\LessUtils;
 
 /**
@@ -23,6 +24,7 @@ class LessphpFilter extends BaseFilter implements DependencyExtractorInterface
     private $options = [
         'compress' => true
     ];
+    private $customFunctions = [];
 
     /**
      * Lessphp Load Paths
@@ -61,6 +63,11 @@ public function setOptions(array $options)
         $this->options = $options;
     }
 
+    public function registerFunction($name, $callable)
+    {
+        $this->customFunctions[$name] = $callable;
+    }
+
     /**
      * @param string $formatter One of "lessjs", "compressed", or "classic".
      */
@@ -80,6 +87,10 @@ public function filterLoad(AssetInterface $asset)
             $lc->addImportDir($loadPath);
         }
 
+        foreach ($this->customFunctions as $name => $callable) {
+            $lc->registerFunction($name, $callable);
+        }
+
         if ($this->formatter) {
             $lc->setFormatter($this->formatter);
         }
@@ -130,4 +141,4 @@ public function getChildren(AssetFactory $factory, $content, $loadPath = null)
 
         return $children;
     }
-}
+}
\ No newline at end of file
diff --git a/tests/Assetic/Test/Filter/LessphpFilterTest.php b/tests/Assetic/Test/Filter/LessphpFilterTest.php
index 14f9774..0058265 100644
--- a/tests/Assetic/Test/Filter/LessphpFilterTest.php
+++ b/tests/Assetic/Test/Filter/LessphpFilterTest.php
@@ -4,6 +4,7 @@
 use Assetic\Asset\StringAsset;
 use Assetic\Factory\AssetFactory;
 use Assetic\Filter\LessphpFilter;
+use ScssPhp\ScssPhp\ValueConverter;
 
 /**
  * @property LessphpFilter $filter
@@ -163,4 +164,22 @@ public function provideImports()
             array('@import-once url(main);'),
         );
     }
+
+    /**
+     * @group integration
+     */
+    public function testRegisterFunction()
+    {
+        $asset = new StringAsset('.foo { color: bar(); }');
+        $asset->load();
+
+        $this->filter->registerFunction('bar', function () { return 'red';});
+        $this->filter->filterLoad($asset);
+
+        $expected = new StringAsset('.foo { color: red; }');
+        $expected->load();
+        $this->filter->filterLoad($expected);
+
+        $this->assertEquals($expected->getContent(), $asset->getContent(), 'custom function can be registered');
+    }
 }