mirror of https://github.com/helix-editor/helix
34 lines
879 B
Rust
34 lines
879 B
Rust
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use crate::movement::{categorize, is_horiz_blank, is_word, skip_over_prev};
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use ropey::RopeSlice;
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#[must_use]
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pub fn nth_prev_word_boundary(slice: RopeSlice, mut char_idx: usize, count: usize) -> usize {
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let mut with_end = false;
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for _ in 0..count {
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if char_idx == 0 {
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break;
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}
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// return if not skip while?
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skip_over_prev(slice, &mut char_idx, |ch| ch == '\n');
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with_end = skip_over_prev(slice, &mut char_idx, is_horiz_blank);
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// refetch
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let ch = slice.char(char_idx);
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if is_word(ch) {
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with_end = skip_over_prev(slice, &mut char_idx, is_word);
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} else if ch.is_ascii_punctuation() {
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with_end = skip_over_prev(slice, &mut char_idx, |ch| ch.is_ascii_punctuation());
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}
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}
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if with_end {
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char_idx
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} else {
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char_idx + 1
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}
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}
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