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#------------------------------------------------------------------------------
# Copyright (c) 2020-2024, Nucleic Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file LICENSE, distributed with this software.
#------------------------------------------------------------------------------
import sys
import ast
from textwrap import dedent
import pytest
from enaml.core.parser import parse
from .test_parser import validate_ast
TEST_SOURCE = {
':= in expr': r"""
a = (b := 1)
""",
':= in tuple': r"""
a = (2, b := 1)
""",
':= in list': r"""
a = [2, b := 1]
""",
':= in if': r"""
if b := 1:
pass
""",
':= in elif': r"""
a = 0
if a:
pass
elif b := 1:
pass
""",
':= in while': r"""
while b := 1:
pass
""",
':= in function argument': r"""
f(a, b := c or None)
"""
}
@pytest.mark.skipif(sys.version_info < (3, 8), reason='Requires Python 3.8')
@pytest.mark.parametrize('desc', TEST_SOURCE.keys())
def test_walrus_operator(desc):
"""Test that we produce valid ast use of the := walrus operator.
"""
src = dedent(TEST_SOURCE[desc]).strip()
print(src)
# Ensure it's valid
py_ast = ast.parse(src)
enaml_ast = parse(src).body[0].ast
validate_ast(py_ast.body[0], enaml_ast.body[0], True)
TEST_BAD_SOURCE = {
':= in while': r"""
while 2 := 1:
pass
""",
':= in function argument': r"""
f(a, 2 := c or None)
"""
}
@pytest.mark.skipif(sys.version_info < (3, 8), reason='Requires Python 3.8')
@pytest.mark.parametrize('desc', TEST_BAD_SOURCE.keys())
def test_invalid_walrus_operator(desc):
"""Test that we produce valid ast use of the := walrus operator.
"""
src = dedent(TEST_BAD_SOURCE[desc]).strip()
print(src)
with pytest.raises(SyntaxError):
enaml_ast = parse(src).body[0].ast
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