grit_lib/
ws.rs

1//! ASCII whitespace helpers shared by the diff engine (`-w`, `-b`, blank-line hunks).
2
3/// Git xdiff / `-w` / `-b` ASCII whitespace (not Unicode general whitespace).
4#[must_use]
5pub fn is_space_git(c: u8) -> bool {
6    matches!(c, b' ' | b'\t' | b'\n' | b'\r' | 0x0b | 0x0c)
7}
8
9/// Returns true if the line is empty or only ASCII whitespace.
10#[must_use]
11pub fn ws_blank_line(line: &str) -> bool {
12    line.bytes().all(is_space_git)
13}
14
15#[cfg(test)]
16mod tests {
17    use super::*;
18
19    #[test]
20    fn is_space_git_is_ascii_only() {
21        for c in [b' ', b'\t', b'\n', b'\r', 0x0b, 0x0c] {
22            assert!(is_space_git(c));
23        }
24        assert!(!is_space_git(b'a'));
25        assert!(!is_space_git(0xa0));
26    }
27
28    #[test]
29    fn blank_line_detection() {
30        assert!(ws_blank_line(""));
31        assert!(ws_blank_line(" \t\r\n"));
32        assert!(!ws_blank_line("  x\n"));
33        assert!(!ws_blank_line("\u{a0}\n"));
34    }
35}
grit_lib/ws.rs

grit_lib/
ws.rs
