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Better detection of ambiguities

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Dave Halter
2018-06-25 01:56:02 +02:00
parent 43d4a8a834
commit da5aa8a2ab
2 changed files with 22 additions and 4 deletions
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12
test/test_pgen2.py
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@@ -12,6 +12,8 @@ import pytest
from parso import load_grammar
from parso import ParserSyntaxError
from parso.pgen2.pgen import generate_grammar
from parso.python import tokenize
def _parse(code, version=None):
@@ -270,3 +272,13 @@ def py_br(each_version):
def test_py3_rb(works_ge_py3):
works_ge_py3.parse("rb'1'")
works_ge_py3.parse("RB'1'")
def test_left_recursion():
with pytest.raises(ValueError, match='left recursion'):
generate_grammar('foo: foo NAME\n', tokenize.PythonTokenTypes)
def test_ambiguities():
with pytest.raises(ValueError, match='ambiguous'):
generate_grammar('foo: bar | baz\nbar: NAME\nbaz: NAME\n', tokenize.PythonTokenTypes)