"""Test pycode.ast"""

import sys

import pytest

from sphinx.pycode import ast


@pytest.mark.parametrize('source,expected', [
    ("a + b", "a + b"),                         # Add
    ("a and b", "a and b"),                     # And
    ("os.path", "os.path"),                     # Attribute
    ("1 * 2", "1 * 2"),                         # BinOp
    ("a & b", "a & b"),                         # BitAnd
    ("a | b", "a | b"),                         # BitOr
    ("a ^ b", "a ^ b"),                         # BitXor
    ("a and b and c", "a and b and c"),         # BoolOp
    ("b'bytes'", "b'bytes'"),                   # Bytes
    ("object()", "object()"),                   # Call
    ("1234", "1234"),                           # Constant
    ("{'key1': 'value1', 'key2': 'value2'}",
     "{'key1': 'value1', 'key2': 'value2'}"),   # Dict
    ("a / b", "a / b"),                         # Div
    ("...", "..."),                             # Ellipsis
    ("a // b", "a // b"),                       # FloorDiv
    ("Tuple[int, int]", "Tuple[int, int]"),     # Index, Subscript
    ("~ 1", "~ 1"),                             # Invert
    ("lambda x, y: x + y",
     "lambda x, y: ..."),                       # Lambda
    ("[1, 2, 3]", "[1, 2, 3]"),                 # List
    ("a << b", "a << b"),                       # LShift
    ("a @ b", "a @ b"),                         # MatMult
    ("a % b", "a % b"),                         # Mod
    ("a * b", "a * b"),                         # Mult
    ("sys", "sys"),                             # Name, NameConstant
    ("1234", "1234"),                           # Num
    ("not a", "not a"),                         # Not
    ("a or b", "a or b"),                       # Or
    ("a ** b", "a ** b"),                       # Pow
    ("a >> b", "a >> b"),                       # RShift
    ("{1, 2, 3}", "{1, 2, 3}"),                 # Set
    ("a - b", "a - b"),                         # Sub
    ("'str'", "'str'"),                         # Str
    ("+ a", "+ a"),                             # UAdd
    ("- 1", "- 1"),                             # UnaryOp
    ("- a", "- a"),                             # USub
    ("(1, 2, 3)", "(1, 2, 3)"),                 # Tuple
    ("()", "()"),                               # Tuple (empty)
    ("(1,)", "(1,)"),                           # Tuple (single item)
])
def test_unparse(source, expected):
    module = ast.parse(source)
    assert ast.unparse(module.body[0].value, source) == expected


def test_unparse_None():
    assert ast.unparse(None) is None


@pytest.mark.skipif(sys.version_info < (3, 8), reason='python 3.8+ is required.')
@pytest.mark.parametrize('source,expected', [
    ("lambda x=0, /, y=1, *args, z, **kwargs: x + y + z",
     "lambda x=0, /, y=1, *args, z, **kwargs: ..."),    # posonlyargs
    ("0x1234", "0x1234"),                               # Constant
    ("1_000_000", "1_000_000"),                         # Constant
])
def test_unparse_py38(source, expected):
    module = ast.parse(source)
    assert ast.unparse(module.body[0].value, source) == expected