lexical-util 0.8.5

Shared utilities for lexical creates.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110

#![cfg(any(feature = "parse", feature = "write"))]

use lexical_util::digit;

#[cfg(feature = "parse")]
fn char_to_digit(c: u8, radix: u32, expected: Option<u32>) {
    assert_eq!(digit::char_to_digit_const(c, radix), expected);
    assert_eq!(digit::char_to_digit(c, radix), expected);
}

#[test]
#[cfg(feature = "parse")]
fn char_to_digit_test() {
    char_to_digit(b'0', 2, Some(0));
    char_to_digit(b'1', 2, Some(1));
    char_to_digit(b'9', 2, None);
    char_to_digit(b'A', 2, None);
    char_to_digit(b'Z', 2, None);

    char_to_digit(b'0', 10, Some(0));
    char_to_digit(b'1', 10, Some(1));
    char_to_digit(b'9', 10, Some(9));
    char_to_digit(b'A', 10, None);
    char_to_digit(b'Z', 10, None);

    char_to_digit(b'0', 16, Some(0));
    char_to_digit(b'1', 16, Some(1));
    char_to_digit(b'9', 16, Some(9));
    char_to_digit(b'A', 16, Some(10));
    char_to_digit(b'Z', 16, None);

    // char_to_digit doesn't care about the radix.
    // check some more comprehensive cases.
    for c in b'0'..=b'9' {
        char_to_digit(c, 10, Some(c as u32 - b'0' as u32));
    }
    char_to_digit(0x29, 10, None);
    char_to_digit(0x3A, 10, None);
    char_to_digit(0x59, 10, None);

    for c in b'0'..=b'8' {
        char_to_digit(c, 9, Some(c as u32 - b'0' as u32));
    }
    char_to_digit(0x29, 9, None);
    char_to_digit(0x39, 9, None);
    char_to_digit(0x3A, 9, None);
    char_to_digit(0x59, 9, None);

    for c in b'0'..=b'9' {
        char_to_digit(c, 16, Some(c as u32 - b'0' as u32));
    }
    for c in b'a'..=b'f' {
        char_to_digit(c, 16, Some(c as u32 - b'a' as u32 + 10));
    }
    for c in b'A'..=b'F' {
        char_to_digit(c, 16, Some(c as u32 - b'A' as u32 + 10));
    }
    char_to_digit(0x29, 16, None);
    char_to_digit(0x40, 16, None);
    char_to_digit(0x3A, 16, None);
    char_to_digit(0x59, 16, None);
    char_to_digit(0x41, 16, Some(10));
    char_to_digit(0x47, 16, None);
    char_to_digit(0x5A, 16, None);
    char_to_digit(0x61, 16, Some(10));
    char_to_digit(0x67, 16, None);
    char_to_digit(0x7A, 16, None);
}

#[cfg(feature = "parse")]
fn char_is_digit(c: u8, radix: u32, expected: bool) {
    assert_eq!(digit::char_is_digit_const(c, radix), expected);
    assert_eq!(digit::char_is_digit(c, radix), expected);
}

#[test]
#[cfg(feature = "parse")]
fn char_is_digit_const_test() {
    char_is_digit(b'0', 2, true);
    char_is_digit(b'1', 2, true);
    char_is_digit(b'9', 2, false);
    char_is_digit(b'A', 2, false);
    char_is_digit(b'Z', 2, false);

    char_is_digit(b'0', 10, true);
    char_is_digit(b'1', 10, true);
    char_is_digit(b'9', 10, true);
    char_is_digit(b'A', 10, false);
    char_is_digit(b'Z', 10, false);

    char_is_digit(b'0', 16, true);
    char_is_digit(b'1', 16, true);
    char_is_digit(b'9', 16, true);
    char_is_digit(b'A', 16, true);
    char_is_digit(b'Z', 16, false);
}

#[cfg(feature = "write")]
fn digit_to_char(digit: u32, radix: u32, expected: u8) {
    assert_eq!(digit::digit_to_char_const(digit, radix), expected);
    assert_eq!(unsafe { digit::digit_to_char(digit) }, expected);
}

#[test]
#[cfg(feature = "write")]
fn digit_to_char_const_test() {
    digit_to_char(9, 10, b'9');
    digit_to_char(10, 36, b'A');
    digit_to_char(11, 36, b'B');
}