scolapasta_int_parse/
whitespace.rs

1pub fn trim_leading(bytes: &[u8]) -> &[u8] {
2    if let Some(idx) = bytes.iter().position(|&b| !posix_space::is_space(b)) {
3        &bytes[idx..]
4    } else {
5        bytes
6    }
7}
8
9pub fn trim_trailing(bytes: &[u8]) -> &[u8] {
10    if let Some(idx) = bytes.iter().rposition(|&b| !posix_space::is_space(b)) {
11        &bytes[..=idx]
12    } else {
13        bytes
14    }
15}
16
17pub fn trim(bytes: &[u8]) -> &[u8] {
18    let bytes = trim_leading(bytes);
19    trim_trailing(bytes)
20}
21
22#[cfg(test)]
23mod tests {
24    use super::*;
25
26    #[test]
27    fn trim_leading_trims_leading_whitespace() {
28        assert_eq!(trim_leading(b"abc"), b"abc");
29        assert_eq!(trim_leading(b" abc"), b"abc");
30        assert_eq!(trim_leading(b"      abc"), b"abc");
31        assert_eq!(trim_leading(b"\tabc"), b"abc");
32        assert_eq!(trim_leading(b"\nabc"), b"abc");
33        assert_eq!(trim_leading(b"\x0Aabc"), b"abc");
34        assert_eq!(trim_leading(b"\x0Cabc"), b"abc");
35        assert_eq!(trim_leading(b" \t\n\x0A\x0Cabc"), b"abc");
36        assert_eq!(
37            trim_leading(b" \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0Cabc"),
38            b"abc"
39        );
40    }
41
42    #[test]
43    fn trim_leading_preserves_trailing_whitespace() {
44        assert_eq!(trim_leading(b"abc "), b"abc ");
45        assert_eq!(trim_leading(b" abc "), b"abc ");
46        assert_eq!(trim_leading(b"      abc      "), b"abc      ");
47        assert_eq!(trim_leading(b"\tabc\t"), b"abc\t");
48        assert_eq!(trim_leading(b"\nabc\n"), b"abc\n");
49        assert_eq!(trim_leading(b"\x0Aabc\x0A"), b"abc\x0A");
50        assert_eq!(trim_leading(b"\x0Cabc\x0C"), b"abc\x0C");
51        assert_eq!(trim_leading(b" \t\n\x0A\x0Cabc \t\n\x0A\x0C"), b"abc \t\n\x0A\x0C");
52        assert_eq!(
53            trim_leading(b" \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0Cabc \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C"),
54            b"abc \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C"
55        );
56    }
57
58    #[test]
59    fn trim_trailing_trims_trailing_whitespace() {
60        assert_eq!(trim_trailing(b"abc"), b"abc");
61        assert_eq!(trim_trailing(b"abc "), b"abc");
62        assert_eq!(trim_trailing(b"abc      "), b"abc");
63        assert_eq!(trim_trailing(b"abc\t"), b"abc");
64        assert_eq!(trim_trailing(b"abc\n"), b"abc");
65        assert_eq!(trim_trailing(b"abc\x0A"), b"abc");
66        assert_eq!(trim_trailing(b"abc\x0C"), b"abc");
67        assert_eq!(trim_trailing(b"abc \t\n\x0A\x0C"), b"abc");
68        assert_eq!(
69            trim_trailing(b"abc \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C"),
70            b"abc"
71        );
72    }
73
74    #[test]
75    fn trim_leading_preserves_leading_whitespace() {
76        assert_eq!(trim_trailing(b" abc"), b" abc");
77        assert_eq!(trim_trailing(b" abc "), b" abc");
78        assert_eq!(trim_trailing(b"      abc      "), b"      abc");
79        assert_eq!(trim_trailing(b"\tabc\t"), b"\tabc");
80        assert_eq!(trim_trailing(b"\nabc\n"), b"\nabc");
81        assert_eq!(trim_trailing(b"\x0Aabc\x0A"), b"\x0Aabc");
82        assert_eq!(trim_trailing(b"\x0Cabc\x0C"), b"\x0Cabc");
83        assert_eq!(trim_trailing(b" \t\n\x0A\x0Cabc \t\n\x0A\x0C"), b" \t\n\x0A\x0Cabc");
84        assert_eq!(
85            trim_trailing(b" \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0Cabc \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C"),
86            b" \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0Cabc"
87        );
88    }
89
90    #[test]
91    fn trim_trims_all_whitespace() {
92        assert_eq!(trim(b" abc "), b"abc");
93        assert_eq!(trim(b" abc "), b"abc");
94        assert_eq!(trim(b"      abc      "), b"abc");
95        assert_eq!(trim(b"\tabc\t"), b"abc");
96        assert_eq!(trim(b"\nabc\n"), b"abc");
97        assert_eq!(trim(b"\x0Aabc\x0A"), b"abc");
98        assert_eq!(trim(b"\x0Cabc\x0C"), b"abc");
99        assert_eq!(trim(b" \t\n\x0A\x0Cabc \t\n\x0A\x0C"), b"abc");
100        assert_eq!(
101            trim(b" \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0Cabc \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C \t\n\x0A\x0C"),
102            b"abc"
103        );
104    }
105
106    #[test]
107    fn vertical_tab_is_whitespace() {
108        // ```
109        // [3.1.2] > Integer "    \u000B 27"
110        // => 27
111        // ```
112        assert_eq!(trim_leading(b"\x0Babc"), b"abc");
113        assert_eq!(trim_trailing(b"abc\x0B"), b"abc");
114        assert_eq!(trim(b"\x0Babc\x0B"), b"abc");
115    }
116}
scolapasta_int_parse/whitespace.rs

scolapasta_int_parse/
whitespace.rs
