lapp/
strutil.rs

1use super::LappError;
2
3pub fn skipws(slice: &str) -> &str {
4    let nxt = slice.find(|c: char| ! c.is_whitespace()).unwrap_or(slice.len());
5    &slice[nxt..]
6}
7
8pub fn grab_word<'a>(pslice: &mut &str) -> String {
9    let nxt = pslice.find(|c: char| c.is_whitespace()).unwrap_or(pslice.len());
10    let word = (&pslice[0..nxt]).to_string();
11    *pslice = skipws(&pslice[nxt..]);
12    word
13}
14
15pub fn starts_with(pslice: &mut &str, start: &str) -> bool {
16    if pslice.starts_with(start) {
17        *pslice = &pslice[start.len()..];
18        true
19    } else {
20        false
21    }
22}
23
24pub fn ends_with(pslice: &mut &str, start: &str) -> bool {
25    if pslice.ends_with(start) {
26        *pslice = &pslice[0..(pslice.len() - start.len())];
27        true
28    } else {
29        false
30    }
31}
32
33pub fn grab_upto(pslice: &mut &str, sub: &str) -> Result<String,LappError> {
34    if let Some(idx) = pslice.find(sub) {
35        let s = (&pslice[0..idx].trim()).to_string();
36        *pslice = &pslice[idx+sub.len()..];
37        Ok(s)
38    } else {
39        Err(LappError(format!("cannot find end {:?}",sub)))
40    }
41}
42
43pub fn split_with<'a>(slice: &'a str, needle: &str) -> Option<(&'a str,&'a str)> {
44    if let Some(idx) = slice.find(needle) {
45        Some((
46            &slice[0..idx], &slice[idx+needle.len()..]
47        ))
48    } else {
49        None
50    }
51}
52
53pub fn dedent(s: &str) -> String {
54    let mut lines = s.lines();
55    let mut res = String::new();
56    let mut idx = None;
57    while let Some(line) = lines.next() {
58        if let Some(pos) = line.chars().position(|c| ! c.is_whitespace()) {
59            idx = Some(pos);
60            res += &line[pos..];
61            res.push('\n');
62            break;
63        }
64    }
65    if let Some(pos) = idx {
66        while let Some(line) = lines.next() {
67            res += if line.len() >= pos { &line[pos..] } else { line };
68            res.push('\n');
69        }
70    }
71    res
72}
lapp/strutil.rs

lapp/
strutil.rs
