1 files changed, 45 insertions, 0 deletions
diff --git a/lib/exTpl/FunctionExpression.php b/lib/exTpl/FunctionExpression.php
new file mode 100644
index 0000000..48d4413
--- /dev/null
+++ b/lib/exTpl/FunctionExpression.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace exTpl;
+
+/**
+ * FunctionExpression represents a function call.
+ */
+class FunctionExpression implements Expression
+{
+    protected Expression $name;
+    protected array $arguments;
+
+    /**
+     * Initializes a new Expression instance.
+     *
+     * @param Expression $name function name
+     * @param array $arguments function arguments
+     */
+    public function __construct(Expression $name, array $arguments)
+    {
+        $this->name      = $name;
+        $this->arguments = $arguments;
+    }
+
+    /**
+     * Returns the value of this expression.
+     *
+     * @param Context $context symbol table
+     */
+    public function value(Context $context): mixed
+    {
+        $callable  = $this->name->value($context);
+        $arguments = [];
+
+        foreach ($this->arguments as $expr) {
+            $arguments[] = $expr->value($context);
+        }
+
+        if (is_callable($callable)) {
+            return $callable(...$arguments);
+        }
+
+        return null;
+    }
+}