27 lines
848 B
Plaintext
27 lines
848 B
Plaintext
use std::str::FromStr;
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// Precondition: range doesn't contain multibyte UTF-8 characters
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fn range_expand(range : &str) -> Vec<i32> {
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range.split(',').flat_map(|item| {
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match i32::from_str(item) {
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Ok(n) => n..n+1,
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_ => {
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let dashpos=
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match item.rfind("--") {
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Some(p) => p,
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None => item.rfind('-').unwrap(),
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};
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let rstart=i32::from_str(
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unsafe{ item.slice_unchecked(0,dashpos)} ).unwrap();
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let rend=i32::from_str(
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unsafe{ item.slice_unchecked(dashpos+1,item.len()) } ).unwrap();
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rstart..rend+1
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},
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}
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}).collect()
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}
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fn main() {
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println!("{:?}", range_expand("-6,-3--1,3-5,7-11,14,15,17-20"));
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}
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