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-rw-r--r--helix-core/src/movement.rs107
1 files changed, 104 insertions, 3 deletions
diff --git a/helix-core/src/movement.rs b/helix-core/src/movement.rs
index b44d149f..003a1f37 100644
--- a/helix-core/src/movement.rs
+++ b/helix-core/src/movement.rs
@@ -177,6 +177,10 @@ pub fn move_prev_word_start(slice: RopeSlice, range: Range, count: usize) -> Ran
word_move(slice, range, count, WordMotionTarget::PrevWordStart)
}
+pub fn move_prev_word_end(slice: RopeSlice, range: Range, count: usize) -> Range {
+ word_move(slice, range, count, WordMotionTarget::PrevWordEnd)
+}
+
pub fn move_next_long_word_start(slice: RopeSlice, range: Range, count: usize) -> Range {
word_move(slice, range, count, WordMotionTarget::NextLongWordStart)
}
@@ -189,8 +193,8 @@ pub fn move_prev_long_word_start(slice: RopeSlice, range: Range, count: usize) -
word_move(slice, range, count, WordMotionTarget::PrevLongWordStart)
}
-pub fn move_prev_word_end(slice: RopeSlice, range: Range, count: usize) -> Range {
- word_move(slice, range, count, WordMotionTarget::PrevWordEnd)
+pub fn move_prev_long_word_end(slice: RopeSlice, range: Range, count: usize) -> Range {
+ word_move(slice, range, count, WordMotionTarget::PrevLongWordEnd)
}
fn word_move(slice: RopeSlice, range: Range, count: usize, target: WordMotionTarget) -> Range {
@@ -199,6 +203,7 @@ fn word_move(slice: RopeSlice, range: Range, count: usize, target: WordMotionTar
WordMotionTarget::PrevWordStart
| WordMotionTarget::PrevLongWordStart
| WordMotionTarget::PrevWordEnd
+ | WordMotionTarget::PrevLongWordEnd
);
// Special-case early-out.
@@ -377,6 +382,7 @@ pub enum WordMotionTarget {
NextLongWordStart,
NextLongWordEnd,
PrevLongWordStart,
+ PrevLongWordEnd,
}
pub trait CharHelpers {
@@ -393,6 +399,7 @@ impl CharHelpers for Chars<'_> {
WordMotionTarget::PrevWordStart
| WordMotionTarget::PrevLongWordStart
| WordMotionTarget::PrevWordEnd
+ | WordMotionTarget::PrevLongWordEnd
);
// Reverse the iterator if needed for the motion direction.
@@ -479,7 +486,7 @@ fn reached_target(target: WordMotionTarget, prev_ch: char, next_ch: char) -> boo
is_word_boundary(prev_ch, next_ch)
&& (!prev_ch.is_whitespace() || char_is_line_ending(next_ch))
}
- WordMotionTarget::NextLongWordStart => {
+ WordMotionTarget::NextLongWordStart | WordMotionTarget::PrevLongWordEnd => {
is_long_word_boundary(prev_ch, next_ch)
&& (char_is_line_ending(next_ch) || !next_ch.is_whitespace())
}
@@ -1446,6 +1453,100 @@ mod test {
}
#[test]
+ fn test_behaviour_when_moving_to_end_of_prev_long_words() {
+ let tests = [
+ (
+ "Basic backward motion from the middle of a word",
+ vec![(1, Range::new(3, 3), Range::new(4, 0))],
+ ),
+ ("Starting from after boundary retreats the anchor",
+ vec![(1, Range::new(0, 9), Range::new(8, 0))],
+ ),
+ (
+ "Jump to end of a word succeeded by whitespace",
+ vec![(1, Range::new(10, 10), Range::new(10, 4))],
+ ),
+ (
+ " Jump to start of line from end of word preceded by whitespace",
+ vec![(1, Range::new(3, 4), Range::new(4, 0))],
+ ),
+ ("Previous anchor is irrelevant for backward motions",
+ vec![(1, Range::new(12, 5), Range::new(6, 0))]),
+ (
+ " Starting from whitespace moves to first space in sequence",
+ vec![(1, Range::new(0, 4), Range::new(4, 0))],
+ ),
+ ("Identifiers_with_underscores are considered a single word",
+ vec![(1, Range::new(0, 20), Range::new(20, 0))]),
+ (
+ "Jumping\n \nback through a newline selects whitespace",
+ vec![(1, Range::new(0, 13), Range::new(12, 8))],
+ ),
+ (
+ "Jumping to start of word from the end selects the word",
+ vec![(1, Range::new(6, 7), Range::new(7, 0))],
+ ),
+ (
+ "alphanumeric.!,and.?=punctuation are treated exactly the same",
+ vec![(1, Range::new(29, 30), Range::new(30, 0))],
+ ),
+ (
+ "... ... punctuation and spaces behave as expected",
+ vec![
+ (1, Range::new(0, 10), Range::new(9, 3)),
+ (1, Range::new(10, 6), Range::new(7, 3)),
+ ],
+ ),
+ (".._.._ punctuation is joined by underscores into a single block",
+ vec![(1, Range::new(0, 6), Range::new(6, 0))]),
+ (
+ "Newlines\n\nare bridged seamlessly.",
+ vec![(1, Range::new(0, 10), Range::new(8, 0))],
+ ),
+ (
+ "Jumping \n\n\n\n\nback from within a newline group selects previous block",
+ vec![(1, Range::new(0, 13), Range::new(11, 7))],
+ ),
+ (
+ "Failed motions do not modify the range",
+ vec![(0, Range::new(3, 0), Range::new(3, 0))],
+ ),
+ (
+ "Multiple motions at once resolve correctly",
+ vec![(3, Range::new(19, 19), Range::new(8, 0))],
+ ),
+ (
+ "Excessive motions are performed partially",
+ vec![(999, Range::new(40, 40), Range::new(9, 0))],
+ ),
+ (
+ "", // Edge case of moving backwards in empty string
+ vec![(1, Range::new(0, 0), Range::new(0, 0))],
+ ),
+ (
+ "\n\n\n\n\n", // Edge case of moving backwards in all newlines
+ vec![(1, Range::new(5, 5), Range::new(0, 0))],
+ ),
+ (" \n \nJumping back through alternated space blocks and newlines selects the space blocks",
+ vec![
+ (1, Range::new(0, 8), Range::new(7, 4)),
+ (1, Range::new(7, 4), Range::new(3, 0)),
+ ]),
+ ("ヒーリ..クス multibyte characters behave as normal characters, including when interacting with punctuation",
+ vec![
+ (1, Range::new(0, 8), Range::new(7, 0)),
+ ]),
+ ];
+
+ for (sample, scenario) in tests {
+ for (count, begin, expected_end) in scenario.into_iter() {
+ let range = move_prev_long_word_end(Rope::from(sample).slice(..), begin, count);
+ assert_eq!(range, expected_end, "Case failed: [{}]", sample);
+ }
+ }
+ }
+
+ #[test]
fn test_behaviour_when_moving_to_prev_paragraph_single() {
let tests = [
("#[|]#", "#[|]#"),