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