Added a new expression to slugify a string

Author: sebprt

src/Slugify.php

@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kiboko\Component\StringExpressionLanguage;
+
+use Symfony\Component\ExpressionLanguage\ExpressionFunction;
+
+final class Slugify extends ExpressionFunction
+{
+    public function __construct($name)
+    {
+        parent::__construct(
+            $name,
+            $this->compile(...)->bindTo($this),
+            $this->evaluate(...)->bindTo($this)
+        );
+    }
+
+    private function compile(string $value, string $divider = '-'): string
+    {
+        return <<<PHP
+            (function () use (\$input) : string {
+                \$text = preg_replace('~[^\\pL\\d]+~u', {$divider}, {$value});
+                \$text = iconv('utf-8', 'us-ascii//TRANSLIT', \$text);
+                \$text = preg_replace('~[^-\\w]+~', '', \$text);
+                \$text = trim(\$text, {$divider});
+                \$text = preg_replace('~-+~', {$divider}, \$text);
+                \$text = strtolower(\$text);
+
+                if (strlen(\$text) <= 0) {
+                    return '';
+                }
+
+                return \$text;
+            })()
+            PHP;
+    }
+
+    private function evaluate(array $context, string $value, string $divider = '-'): string
+    {
+        $text = preg_replace('~[^\pL\d]+~u', $divider, $value);
+        $text = iconv('utf-8', 'us-ascii//TRANSLIT', $text);
+        $text = preg_replace('~[^-\w]+~', '', $text);
+        $text = trim($text, $divider);
+        $text = preg_replace('~-+~', $divider, $text);
+        $text = strtolower($text);
+
+        if (\strlen($text) <= 0) {
+            return 'n-a';
+        }
+
+        return $text;
+    }
+}

src/StringExpressionLanguageProvider.php

@@ -37,6 +37,7 @@ public function getFunctions(): array
             new AsFloat('asFloat'),
             new AsInteger('asInteger'),
             new AsString('asString'),
+            new Slugify('slugify'),
         ];
     }
 }