Implement `When` and `WhenNot` parsers.

1 files changed, 14 insertions, 0 deletions

diff --git a/htmtl/parsers/when_not.py b/htmtl/parsers/when_not.py
new file mode 100644
index 0000000..68e3d09
--- /dev/null
+++ b/htmtl/parsers/when_not.py
@@ -0,0 +1,14 @@
+from typing import Optional
+from dompa.nodes import Node
+from ..parser import Parser
+
+
+class WhenNot(Parser):
+    def traverse(self, node: Node) -> Optional[Node]:
+        if "when-not" in node.attributes:
+            if self.expression(node.attributes["when-not"]):
+                return None
+
+            node.attributes.pop("when-not")
+
+        return node
\ No newline at end of file