Function jsws_trim

codegraph-kernel/src/cfnptr.rs:989–1012

JS String.prototype.trim over bytes (the JS set == our jsws set).

(s: &[u8], mut a: usize, mut b: usize)

}

/// JS String.prototype.trim over bytes (the JS set == our jsws set).
fn jsws_trim(s: &[u8], mut a: usize, mut b: usize) -> (usize, usize) {
    loop {
        let l = jsws_len(s, a);
        if l == 0 || a + l > b {
            break;
        }
        a += l;
    }
    // Trailing: walk from the front to find the last non-ws position (ws
    // lengths vary, so scan forward tracking the end of the last non-ws char).
    let mut i = a;
    let mut last_end = a;
    while i < b {
        let l = jsws_len(s, i);
        if l == 0 {
            i += 1;
            last_end = i;
        } else {
            i += l;
        }
    }
    b = last_end;
    (a, b)
}

/// /(\w+)\s+\**\s*(\w+)\s*$/ — leftmost match whose tail reaches the end.