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vim: Parse skip_magic_trailing_comma from pyproject.toml (#2613)
[etc/vim.git] / src / black / numerics.py
1 """
2 Formatting numeric literals.
3 """
4 from blib2to3.pytree import Leaf
5
6
7 def format_hex(text: str) -> str:
8     """
9     Formats a hexadecimal string like "0x12B3"
10     """
11     before, after = text[:2], text[2:]
12     return f"{before}{after.upper()}"
13
14
15 def format_scientific_notation(text: str) -> str:
16     """Formats a numeric string utilizing scentific notation"""
17     before, after = text.split("e")
18     sign = ""
19     if after.startswith("-"):
20         after = after[1:]
21         sign = "-"
22     elif after.startswith("+"):
23         after = after[1:]
24     before = format_float_or_int_string(before)
25     return f"{before}e{sign}{after}"
26
27
28 def format_long_or_complex_number(text: str) -> str:
29     """Formats a long or complex string like `10L` or `10j`"""
30     number = text[:-1]
31     suffix = text[-1]
32     # Capitalize in "2L" because "l" looks too similar to "1".
33     if suffix == "l":
34         suffix = "L"
35     return f"{format_float_or_int_string(number)}{suffix}"
36
37
38 def format_float_or_int_string(text: str) -> str:
39     """Formats a float string like "1.0"."""
40     if "." not in text:
41         return text
42
43     before, after = text.split(".")
44     return f"{before or 0}.{after or 0}"
45
46
47 def normalize_numeric_literal(leaf: Leaf) -> None:
48     """Normalizes numeric (float, int, and complex) literals.
49
50     All letters used in the representation are normalized to lowercase (except
51     in Python 2 long literals).
52     """
53     text = leaf.value.lower()
54     if text.startswith(("0o", "0b")):
55         # Leave octal and binary literals alone.
56         pass
57     elif text.startswith("0x"):
58         text = format_hex(text)
59     elif "e" in text:
60         text = format_scientific_notation(text)
61     elif text.endswith(("j", "l")):
62         text = format_long_or_complex_number(text)
63     else:
64         text = format_float_or_int_string(text)
65     leaf.value = text