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66 lines
1.9 KiB
Rust
66 lines
1.9 KiB
Rust
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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#[test]
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fn different_prev_word_boundary() {
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use ropey::Rope;
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let t = |x, y| {
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let text = Rope::from(x);
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let out = nth_prev_word_boundary(text.slice(..), text.len_chars() - 1, 1);
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assert_eq!(text.slice(..out), y, r#"from "{}""#, x);
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};
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t("abcd\nefg\nwrs", "abcd\nefg\n");
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t("abcd\nefg\n", "abcd\n");
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t("abcd\n", "");
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t("hello, world!", "hello, world");
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t("hello, world", "hello, ");
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t("hello, ", "hello");
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t("hello", "");
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t("こんにちは、世界！", "こんにちは、世界！"); // TODO: punctuation
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t("こんにちは、世界", "こんにちは、");
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t("こんにちは、", "こんにちは、"); // what?
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t("こんにちは", "");
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t("この世界。", "この世界。"); // what?
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t("この世界", "");
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t("お前はもう死んでいる", "");
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t("その300円です", ""); // TODO: should stop at 300
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t("唱k", ""); // TODO: should stop at 唱
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t("1 + 1 = 2", "1 + 1 = ");
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t("1 + 1 =", "1 + 1 ");
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t("1 + 1", "1 + ");
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t("1 + ", "1 ");
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t("1 ", "");
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t("1+1=2", "1+1=");
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}
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