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64 lines
1003 B
Rust
64 lines
1003 B
Rust
use crate::RopeSlice;
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pub fn find_nth_next(
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text: RopeSlice,
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ch: char,
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mut pos: usize,
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n: usize,
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inclusive: bool,
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) -> Option<usize> {
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if pos >= text.len_chars() {
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return None;
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}
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// start searching right after pos
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let mut chars = text.chars_at(pos + 1);
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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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if !inclusive {
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pos -= 1;
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}
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Some(pos)
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}
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pub fn find_nth_prev(
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text: RopeSlice,
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ch: char,
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mut pos: usize,
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n: usize,
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inclusive: bool,
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) -> Option<usize> {
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// start searching right before pos
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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 = pos.saturating_sub(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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if !inclusive {
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pos += 1;
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}
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Some(pos)
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}
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