Transforming tree after standalone parser results in different AST about lark HOT 4 CLOSED

You can't mix standalone code and the normal lark distrubtion. lark.Tree and example_parser.Tree are different classes, and lark.Transformer is not going to recognize example_parser.Tree. Use example_parser.Transformer for the standalone tree.

from lark.

I was unaware of this, but it makes perfect sense.

Does this also include the transformer directly passed to the standalone parser upon creation? In the example the output seems to be correct, but I was wondering if I should also use example_parser.Transformer here.

from lark.

You should. In fact, you should never use both a generated standalone parser and the distribution in any situation.

The directly passed transformer happens to work -- in fact, it doesn't need to be a subclass of Transformer at all, only it's methods are extracted and used later on. But you shouldn't rely on this.

from lark.

Thank you for clarifying!

from lark.