diff options
Diffstat (limited to 'helix-core/src/movement.rs')
| -rw-r--r-- | helix-core/src/movement.rs | 99 |
1 files changed, 94 insertions, 5 deletions
diff --git a/helix-core/src/movement.rs b/helix-core/src/movement.rs index acc95e7e..f9e5deb4 100644 --- a/helix-core/src/movement.rs +++ b/helix-core/src/movement.rs @@ -113,6 +113,10 @@ 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) +} + fn word_move(slice: RopeSlice, range: Range, count: usize, target: WordMotionTarget) -> Range { (0..count).fold(range, |range, _| { slice.chars_at(range.head).range_to_target(target, range) @@ -159,6 +163,7 @@ pub enum WordMotionTarget { NextWordStart, NextWordEnd, PrevWordStart, + PrevWordEnd, // A "Long word" (also known as a WORD in vim/kakoune) is strictly // delimited by whitespace, and can consist of punctuation as well // as alphanumerics. @@ -181,7 +186,9 @@ impl CharHelpers for Chars<'_> { fn range_to_target(&mut self, target: WordMotionTarget, origin: Range) -> Range { // Characters are iterated forward or backwards depending on the motion direction. let characters: Box<dyn Iterator<Item = char>> = match target { - WordMotionTarget::PrevWordStart | WordMotionTarget::PrevLongWordStart => { + WordMotionTarget::PrevWordStart + | WordMotionTarget::PrevLongWordStart + | WordMotionTarget::PrevWordEnd => { self.next(); Box::new(from_fn(|| self.prev())) } @@ -190,9 +197,9 @@ impl CharHelpers for Chars<'_> { // Index advancement also depends on the direction. let advance: &dyn Fn(&mut usize) = match target { - WordMotionTarget::PrevWordStart | WordMotionTarget::PrevLongWordStart => { - &|u| *u = u.saturating_sub(1) - } + WordMotionTarget::PrevWordStart + | WordMotionTarget::PrevLongWordStart + | WordMotionTarget::PrevWordEnd => &|u| *u = u.saturating_sub(1), _ => &|u| *u += 1, }; @@ -265,7 +272,7 @@ fn reached_target(target: WordMotionTarget, peek: char, next_peek: Option<&char> }; match target { - WordMotionTarget::NextWordStart => { + WordMotionTarget::NextWordStart | WordMotionTarget::PrevWordEnd => { is_word_boundary(peek, *next_peek) && (char_is_line_ending(*next_peek) || !next_peek.is_whitespace()) } @@ -914,6 +921,88 @@ mod test { } #[test] + fn test_behaviour_when_moving_to_end_of_previous_words() { + let tests = array::IntoIter::new([ + ("Basic backward motion from the middle of a word", + vec![(1, Range::new(9, 9), Range::new(9, 5))]), + ("Starting from after boundary retreats the anchor", + vec![(1, Range::new(0, 13), Range::new(12, 8))]), + ("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(7, 7), Range::new(7, 0))]), + ("Previous anchor is irrelevant for backward motions", + vec![(1, Range::new(26, 12), Range::new(12, 8))]), + (" Starting from whitespace moves to first space in sequence", + vec![(1, Range::new(0, 3), Range::new(3, 0))]), + ("Test identifiers_with_underscores are considered a single word", + vec![(1, Range::new(0, 25), Range::new(25, 4))]), + ("Jumping\n \nback through a newline selects whitespace", + vec![(1, Range::new(0, 13), Range::new(11, 8))]), + ("Jumping to start of word from the end selects the whole word", + vec![(1, Range::new(15, 15), Range::new(15, 10))]), + ("alphanumeric.!,and.?=punctuation are considered 'words' for the purposes of word motion", + vec![ + (1, Range::new(30, 30), Range::new(30, 21)), + (1, Range::new(30, 21), Range::new(20, 18)), + (1, Range::new(20, 18), Range::new(17, 15)) + ]), + + ("... ... punctuation and spaces behave as expected", + vec![ + (1, Range::new(0, 10), Range::new(9, 9)), + (1, Range::new(9, 6), Range::new(5, 3)), + ]), + (".._.._ punctuation is not joined by underscores into a single block", + vec![(1, Range::new(0, 5), Range::new(4, 3))]), + ("Newlines\n\nare bridged seamlessly.", + vec![ + (1, Range::new(0, 10), Range::new(7, 0)), + ]), + ("Jumping \n\n\n\n\nback from within a newline group selects previous block", + vec![ + (1, Range::new(0, 13), Range::new(10, 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(23, 23), Range::new(15, 8)), + ]), + ("Excessive motions are performed partially", + vec![ + (999, Range::new(40, 40), Range::new(8, 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(0, 0), Range::new(0, 0)), + ]), + (" \n \nJumping back through alternated space blocks and newlines selects the space blocks", + vec![ + (1, Range::new(0, 7), Range::new(6, 4)), + (1, Range::new(6, 4), Range::new(2, 0)), + ]), + ("Test ヒーリクス multibyte characters behave as normal characters", + vec![ + (1, Range::new(0, 9), Range::new(9, 4)), + ]), + ]); + + for (sample, scenario) in tests { + for (count, begin, expected_end) in scenario.into_iter() { + let range = move_prev_word_end(Rope::from(sample).slice(..), begin, count); + assert_eq!(range, expected_end, "Case failed: [{}]", sample); + } + } + } + + #[test] fn test_behaviour_when_moving_to_end_of_next_long_words() { let tests = array::IntoIter::new([ ("Basic forward motion from the start of a word to the end of it", |