45 lines
801 B
Rust
45 lines
801 B
Rust
use crate::RopeSlice;
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pub fn find_nth_next(text: RopeSlice, ch: char, mut pos: usize, n: usize) -> Option<usize> {
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if pos >= text.len_chars() || n == 0 {
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return None;
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}
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let mut chars = text.chars_at(pos);
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for _ in 0..n {
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loop {
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let c = chars.next()?;
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pos += 1;
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if c == ch {
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break;
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}
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}
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}
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Some(pos - 1)
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}
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pub fn find_nth_prev(text: RopeSlice, ch: char, mut pos: usize, n: usize) -> Option<usize> {
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if pos == 0 || n == 0 {
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return None;
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}
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let mut chars = text.chars_at(pos);
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for _ in 0..n {
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loop {
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let c = chars.prev()?;
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pos -= 1;
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if c == ch {
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break;
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}
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}
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}
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Some(pos)
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}
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