Make Parser faster!

I believe we can use several grammars to speed up the parsing of the OpenFOAM tutorials. As we generalize the parser, it becomes slower.

here = Path(__file__).absolute().parent
file_name = Path(__file__).absolute().name

specific_grammars = ["fvSolution", "blockMeshDict"]

if file_name in specific_grammars:
    grammar = (here / f"{file_name}_grammar.lark").read_text()
else:
    grammar = (here / "grammar.lark").read_text()

lark_parser = Lark(grammar, start="value", lexer="basic")