1 files changed, 29 insertions, 0 deletions
diff --git a/lib/exTpl/ArithExpression.php b/lib/exTpl/ArithExpression.php
new file mode 100644
index 0000000..4888b73
--- /dev/null
+++ b/lib/exTpl/ArithExpression.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace exTpl;
+
+/**
+ * ArithExpression represents an arithmetic operator.
+ */
+class ArithExpression extends BinaryExpression
+{
+    /**
+     * Returns the value of this expression.
+     *
+     * @param Context $context symbol table
+     */
+    public function value(Context $context): mixed
+    {
+        $left  = $this->left->value($context);
+        $right = $this->right->value($context);
+
+        return match ($this->operator) {
+            '+' => $left + $right,
+            '-' => $left - $right,
+            '*' => $left * $right,
+            '/' => $left / $right,
+            '%' => $left % $right,
+            '~' => $left . $right,
+        };
+    }
+}