Import lark grammar written in one python project into another

[manjrekarom]

What is your question?

How do I import lark grammar written in one python project into another.
E.g.
project A has A/grammar.lark file
project B can import A
But

// file called B/superset.py with inline grammar
...
%import A.grammar.SOME_TERMINAL

fails with FileNotFoundError: [Errno 2] No such file or directory: 'A/grammar.lark'

Explain what you're trying to do, and what is obstructing your progress.
I am not sure if there is a nice way to do this. We are able to %import common.<TERMINAL> so I would like to think there should be a way to do this.

[MegaIng]

lark has facilities for this, namely import_paths.

If "project A" means an importable package, you can use the FromPackageLoader helper class:

from lark.load_grammar import FromPackageLoader

Lark(... , import_paths=[FromPackageLoader('A', [''])

'' can be replaced by a relative path if your grammar files aren't in the top level of the package's folder. You would then import this with %import grammar.SOME_TERMINAL, not %import A.grammar.SOME_TERMINAL.

If A is just a folder somewhere, you can instead provide a path inside of import_paths: Lark(..., import_paths['/some/absolute/path'])

[manjrekarom]

Thanks, this works. Is there a way to also import all symbols from the grammar?
E.g. replace this

%import grammar.ABC
%import grammar.DEF

with

%import grammar.*