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[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_complex_number(text: str) -> str:
29     """Formats a complex string like `10j`"""
30     number = text[:-1]
31     suffix = text[-1]
32     return f"{format_float_or_int_string(number)}{suffix}"
33
34
35 def format_float_or_int_string(text: str) -> str:
36     """Formats a float string like "1.0"."""
37     if "." not in text:
38         return text
39
40     before, after = text.split(".")
41     return f"{before or 0}.{after or 0}"
42
43
44 def normalize_numeric_literal(leaf: Leaf) -> None:
45     """Normalizes numeric (float, int, and complex) literals.
46
47     All letters used in the representation are normalized to lowercase."""
48     text = leaf.value.lower()
49     if text.startswith(("0o", "0b")):
50         # Leave octal and binary literals alone.
51         pass
52     elif text.startswith("0x"):
53         text = format_hex(text)
54     elif "e" in text:
55         text = format_scientific_notation(text)
56     elif text.endswith("j"):
57         text = format_complex_number(text)
58     else:
59         text = format_float_or_int_string(text)
60     leaf.value = text