def create_parser ( self, rule : str = None, read_cache : bool = True, write_cache : bool = True ):
with open( Path( __file__ ).parent / "grammar.lark", "r" ) as f:
grammar_content = f.read()
cache_path = self.get_cache_path( rule, grammar_content ) if read_cache or write_cache else None
parser = None
if read_cache and cache_path.exists():
with open( cache_path, "rb" ) as f:
parser = Lark.load( f )
else:
parser = Lark( grammar_content, start = rule or 'start',
parser='lalr', debug=False, propagate_positions = True,
maybe_placeholders = True )
if write_cache:
with open( cache_path, "wb" ) as f:
parser.save( f )
return parser
