50 lines
1.1 KiB
Rust
50 lines
1.1 KiB
Rust
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#[derive(Clone, Copy, Default, Debug, PartialEq, Eq)]
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pub struct Span {
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start: u32,
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end: u32,
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}
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impl Span {
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pub fn new(start: usize, end: usize) -> Self {
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Self::by_len(start, end.checked_sub(start).unwrap())
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}
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pub fn by_len(start: usize, len: usize) -> Self {
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Self {
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start: start.try_into().unwrap(),
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end: start.checked_add(len).unwrap().try_into().unwrap(),
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}
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}
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pub fn with_start(self, start: usize) -> Self {
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Self::new(start, self.end())
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}
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pub fn trim_start(self, n: usize) -> Self {
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Self::new(self.start().checked_add(n).unwrap(), self.end())
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}
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pub fn translate(self, n: usize) -> Self {
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Self::new(
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self.start().checked_add(n).unwrap(),
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self.end().checked_add(n).unwrap(),
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)
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}
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pub fn start(self) -> usize {
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self.start.try_into().unwrap()
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}
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pub fn end(self) -> usize {
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self.end.try_into().unwrap()
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}
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pub fn len(self) -> usize {
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self.end() - self.start()
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}
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pub fn of(self, s: &str) -> &str {
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&s[self.start()..self.end()]
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}
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}
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