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Fix comments getting removed from inside parenthesized strings (#3909)
[etc/vim.git] / tests / test_trans.py
1 from typing import List, Tuple
2
3 from black.trans import iter_fexpr_spans
4
5
6 def test_fexpr_spans() -> None:
7     def check(
8         string: str, expected_spans: List[Tuple[int, int]], expected_slices: List[str]
9     ) -> None:
10         spans = list(iter_fexpr_spans(string))
11
12         # Checking slices isn't strictly necessary, but it's easier to verify at
13         # a glance than only spans
14         assert len(spans) == len(expected_slices)
15         for (i, j), slice in zip(spans, expected_slices):
16             assert 0 <= i <= j <= len(string)
17             assert string[i:j] == slice
18
19         assert spans == expected_spans
20
21     # Most of these test cases omit the leading 'f' and leading / closing quotes
22     # for convenience
23     # Some additional property-based tests can be found in
24     # https://github.com/psf/black/pull/2654#issuecomment-981411748
25     check("""{var}""", [(0, 5)], ["{var}"])
26     check("""f'{var}'""", [(2, 7)], ["{var}"])
27     check("""f'{1 + f() + 2 + "asdf"}'""", [(2, 24)], ["""{1 + f() + 2 + "asdf"}"""])
28     check("""text {var} text""", [(5, 10)], ["{var}"])
29     check("""text {{ {var} }} text""", [(8, 13)], ["{var}"])
30     check("""{a} {b} {c}""", [(0, 3), (4, 7), (8, 11)], ["{a}", "{b}", "{c}"])
31     check("""f'{a} {b} {c}'""", [(2, 5), (6, 9), (10, 13)], ["{a}", "{b}", "{c}"])
32     check("""{ {} }""", [(0, 6)], ["{ {} }"])
33     check("""{ {{}} }""", [(0, 8)], ["{ {{}} }"])
34     check("""{ {{{}}} }""", [(0, 10)], ["{ {{{}}} }"])
35     check("""{{ {{{}}} }}""", [(5, 7)], ["{}"])
36     check("""{{ {{{var}}} }}""", [(5, 10)], ["{var}"])
37     check("""{f"{0}"}""", [(0, 8)], ["""{f"{0}"}"""])
38     check("""{"'"}""", [(0, 5)], ["""{"'"}"""])
39     check("""{"{"}""", [(0, 5)], ["""{"{"}"""])
40     check("""{"}"}""", [(0, 5)], ["""{"}"}"""])
41     check("""{"{{"}""", [(0, 6)], ["""{"{{"}"""])
42     check("""{''' '''}""", [(0, 9)], ["""{''' '''}"""])
43     check("""{'''{'''}""", [(0, 9)], ["""{'''{'''}"""])
44     check("""{''' {'{ '''}""", [(0, 13)], ["""{''' {'{ '''}"""])
45     check(
46         '''f\'\'\'-{f"""*{f"+{f'.{x}.'}+"}*"""}-'y\\'\'\'\'''',
47         [(5, 33)],
48         ['''{f"""*{f"+{f'.{x}.'}+"}*"""}'''],
49     )
50     check(r"""{}{""", [(0, 2)], ["{}"])
51     check("""f"{'{'''''''''}\"""", [(2, 15)], ["{'{'''''''''}"])