def test_parser_scratch(self):
source = """expression = number , [operator , expression] ;
number = ? get_digit ? ;
repeated = 3 * number ;
"""
parser = Parser()
grammar = parser.parse(source).trimmed().flattened().flattened(flatten)
def test_parser(self):
source = """expression = number , [operator , expression] ;
number = ? get_digit ? ;
(* a comment for you! *)
"""
parser = Parser()
grammar = parser.parse(source).trimmed().flattened().flattened(flatten)
# pprint_parser_tree(grammar, source_len=len(source))
self.assertEqual(list(c.node_type for c in grammar.children),
[TokenType.rule, TokenType.rule, TokenType.comment])
def test_parser_2(self):
with open(os.path.join(FIXTURES_ROOT, "ebnf.ebnf")) as rf:
source = rf.read()
parser = Parser()
grammar = parser.parse(source).trimmed().flattened().flattened(flatten)
# pprint_parser_tree(grammar, source_len=len(source))
rules = {n.children[0].value for n in grammar.children if n.is_type(TokenType.rule)}
expected = {"grammar", "comment", "rule", "identifier", "expression", "expression_terminal",
"option_group", "repetition_group", "grouping_group", "special_handling", "number",
"terminal", "operator", "op_mult", "op_add", "alpha_character", "digit",
"printable"}
self.assertEqual(rules & expected, expected)