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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
import unittest
from traits.observation._generated_parser import (
UnexpectedInput,
Lark_StandAlone,
)
PARSER = Lark_StandAlone()
class TestParsingValidation(unittest.TestCase):
""" Test parsing text using the standalone parser, for valid and invalid
text, without further evaluation on the meaning of their content.
"""
def test_invalid_examples(self):
bad_examples = [
"",
"1name",
"a.b.c^abc",
"[a.b]c",
"a*.c",
"a:[b,c]:",
".a",
"a()",
"-a",
]
for bad_example in bad_examples:
with self.subTest(bad_example=bad_example):
with self.assertRaises(UnexpectedInput):
PARSER.parse(bad_example)
def test_valid_examples(self):
good_examples = [
"name",
"name123",
"name_a",
"_name",
"foo.bar",
"foo . bar",
"foo:bar",
"foo : bar",
"foo,bar",
"foo , bar",
"[foo,bar,foo.spam]",
"[foo, bar].baz",
"[foo, [bar, baz]]:spam",
"foo:[bar.spam,baz]",
"foo.items",
"items",
"+metadata_name",
]
for good_example in good_examples:
with self.subTest(good_example=good_example):
try:
PARSER.parse(good_example)
except Exception:
self.fail(
"Parsing {!r} is expected to succeed.".format(
good_example
)
)
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