- Addedd a new Money extension and a new Function token

src/ControlStructure/FunctionToken.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace Picea\ControlStructure;
+
+class FunctionToken implements ControlStructure {
+
+    public array $token = [ "function", "endfunction", "return" ];
+
+    public function parse(/*\Picae\Compiler\Context*/ &$context, ?string $arguments, string $token) {
+        switch($token) {
+            case "function":
+                return $this->printFunction($context, $arguments);
+
+            case "return":
+                if ( empty($context->functions) ) {
+                    throw new \RuntimeException("A function return tag {% return %} was found without an opening {% function ... %} tag");
+                }
+
+                return $this->printReturn($context, $arguments);
+
+            case "endfunction":
+                if ( empty($context->functions) ) {
+                    throw new \RuntimeException("A function closing tag {% endfunction %} was found without an opening {% function ... %} tag");
+                }
+
+                $context->functions--;
+
+                return $this->printEndFunction($context);
+        }
+    }
+
+    protected function printFunction($context, ?string $arguments) : string
+    {
+        $context->functions++;
+        return "<?php function $arguments { ?>";
+    }
+
+    protected function printReturn($context, ?string $arguments) : string
+    {
+        return "<?php return $arguments; ?>";
+    }
+
+    protected function printEndFunction($context) : string
+    {
+        return "<?php } ?>";
+    }
+}