Added the String casting functions

Author: gplanchat

src/AsFloat.php

@@ -0,0 +1,29 @@
+<?php declare(strict_types=1);
+
+namespace Kiboko\Component\StringExpressionLanguage;
+
+use Symfony\Component\ExpressionLanguage\ExpressionFunction;
+
+final class AsFloat extends ExpressionFunction
+{
+    public function __construct($name)
+    {
+        parent::__construct(
+            $name,
+            $this->compile(...)->bindTo($this),
+            $this->evaluate(...)->bindTo($this)
+        );
+    }
+
+    private function compile(string $value): string
+    {
+        return <<<PHP
+                ((float) $value)
+            PHP;
+    }
+
+    private function evaluate(array $context, string $value)
+    {
+        return (float) $value;
+    }
+}

src/AsInteger.php

@@ -0,0 +1,29 @@
+<?php declare(strict_types=1);
+
+namespace Kiboko\Component\StringExpressionLanguage;
+
+use Symfony\Component\ExpressionLanguage\ExpressionFunction;
+
+final class AsInteger extends ExpressionFunction
+{
+    public function __construct($name)
+    {
+        parent::__construct(
+            $name,
+            $this->compile(...)->bindTo($this),
+            $this->evaluate(...)->bindTo($this)
+        );
+    }
+
+    private function compile(string $value): string
+    {
+        return <<<PHP
+                ((int) $value)
+            PHP;
+    }
+
+    private function evaluate(array $context, string $value)
+    {
+        return (int) $value;
+    }
+}

src/DateTime.php

@@ -17,7 +17,7 @@ public function __construct($name)
         );
     }
 
-    private function compile(string $date, string $format, string $timezone = null): string
+    private function compile(string $date, string $format, string $timezone = 'null'): string
     {
         return <<<"PHP"
                 \\DateTimeImmutable::createFromFormat({$format}, {$date}, {$timezone} !== null ? new \\DateTimeZone({$timezone}) : null)

src/StringExpressionLanguageProvider.php

@@ -32,7 +32,9 @@ public function getFunctions(): array
             new FormatDate('formatDate'),
             new TruncateFileName('truncateFileName'),
             new Now('now'),
-            new ConvertCharCode('convertCharCode')
+            new ConvertCharCode('convertCharCode'),
+            new AsFloat('asFloat'),
+            new AsInteger('asInteger'),
         ];
     }
 }