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ad9866975acfdffcd3407dcba7e9209b94918021
[etc/vim.git] / tests / util.py
1 import os
2 import unittest
3 from contextlib import contextmanager
4 from pathlib import Path
5 from typing import List, Tuple, Iterator, Any
6 import black
7 from functools import partial
8
9 THIS_DIR = Path(__file__).parent
10 PROJECT_ROOT = THIS_DIR.parent
11 EMPTY_LINE = "# EMPTY LINE WITH WHITESPACE" + " (this comment will be removed)"
12 DETERMINISTIC_HEADER = "[Deterministic header]"
13
14
15 DEFAULT_MODE = black.Mode()
16 ff = partial(black.format_file_in_place, mode=DEFAULT_MODE, fast=True)
17 fs = partial(black.format_str, mode=DEFAULT_MODE)
18
19
20 def dump_to_stderr(*output: str) -> str:
21     return "\n" + "\n".join(output) + "\n"
22
23
24 class BlackBaseTestCase(unittest.TestCase):
25     maxDiff = None
26     _diffThreshold = 2 ** 20
27
28     def assertFormatEqual(self, expected: str, actual: str) -> None:
29         if actual != expected and not os.environ.get("SKIP_AST_PRINT"):
30             bdv: black.DebugVisitor[Any]
31             black.out("Expected tree:", fg="green")
32             try:
33                 exp_node = black.lib2to3_parse(expected)
34                 bdv = black.DebugVisitor()
35                 list(bdv.visit(exp_node))
36             except Exception as ve:
37                 black.err(str(ve))
38             black.out("Actual tree:", fg="red")
39             try:
40                 exp_node = black.lib2to3_parse(actual)
41                 bdv = black.DebugVisitor()
42                 list(bdv.visit(exp_node))
43             except Exception as ve:
44                 black.err(str(ve))
45         self.assertMultiLineEqual(expected, actual)
46
47
48 @contextmanager
49 def skip_if_exception(e: str) -> Iterator[None]:
50     try:
51         yield
52     except Exception as exc:
53         if exc.__class__.__name__ == e:
54             unittest.skip(f"Encountered expected exception {exc}, skipping")
55         else:
56             raise
57
58
59 def read_data(name: str, data: bool = True) -> Tuple[str, str]:
60     """read_data('test_name') -> 'input', 'output'"""
61     if not name.endswith((".py", ".pyi", ".out", ".diff")):
62         name += ".py"
63     base_dir = THIS_DIR / "data" if data else PROJECT_ROOT
64     return read_data_from_file(base_dir / name)
65
66
67 def read_data_from_file(file_name: Path) -> Tuple[str, str]:
68     with open(file_name, "r", encoding="utf8") as test:
69         lines = test.readlines()
70     _input: List[str] = []
71     _output: List[str] = []
72     result = _input
73     for line in lines:
74         line = line.replace(EMPTY_LINE, "")
75         if line.rstrip() == "# output":
76             result = _output
77             continue
78
79         result.append(line)
80     if _input and not _output:
81         # If there's no output marker, treat the entire file as already pre-formatted.
82         _output = _input[:]
83     return "".join(_input).strip() + "\n", "".join(_output).strip() + "\n"