use std::iter; use ropey::iter::Chars; use crate::{ chars::{categorize_char, char_is_line_ending, CharCategory}, coords_at_pos, graphemes::{ next_grapheme_boundary, nth_next_grapheme_boundary, nth_prev_grapheme_boundary, prev_grapheme_boundary, }, pos_at_coords, Position, Range, RopeSlice, }; #[derive(Debug, Copy, Clone, PartialEq, Eq)] pub enum Direction { Forward, Backward, } #[derive(Copy, Clone, PartialEq, Eq)] pub enum Movement { Extend, Move, } pub fn move_horizontally( slice: RopeSlice, range: Range, dir: Direction, count: usize, behaviour: Movement, ) -> Range { let pos = range.cursor(slice); // Compute the new position. let new_pos = match dir { Direction::Forward => nth_next_grapheme_boundary(slice, pos, count), Direction::Backward => nth_prev_grapheme_boundary(slice, pos, count), }; // Compute the final new range. range.put_cursor(slice, new_pos, behaviour == Movement::Extend) } pub fn move_vertically( slice: RopeSlice, range: Range, dir: Direction, count: usize, behaviour: Movement, ) -> Range { let pos = range.cursor(slice); // Compute the current position's 2d coordinates. let Position { row, col } = coords_at_pos(slice, pos); let horiz = range.horiz.unwrap_or(col as u32); // Compute the new position. let new_row = match dir { Direction::Forward => (row + count).min(slice.len_lines().saturating_sub(1)), Direction::Backward => row.saturating_sub(count), }; let new_col = col.max(horiz as usize); let new_pos = pos_at_coords(slice, Position::new(new_row, new_col), true); // Special-case to avoid moving to the end of the last non-empty line. if behaviour == Movement::Extend && slice.line(new_row).len_chars() == 0 { return range; } let mut new_range = range.put_cursor(slice, new_pos, behaviour == Movement::Extend); new_range.horiz = Some(horiz); new_range } pub fn move_next_word_start(slice: RopeSlice, range: Range, count: usize) -> Range { word_move(slice, range, count, WordMotionTarget::NextWordStart) } pub fn move_next_word_end(slice: RopeSlice, range: Range, count: usize) -> Range { word_move(slice, range, count, WordMotionTarget::NextWordEnd) } pub fn move_prev_word_start(slice: RopeSlice, range: Range, count: usize) -> Range { word_move(slice, range, count, WordMotionTarget::PrevWordStart) } pub fn move_next_long_word_start(slice: RopeSlice, range: Range, count: usize) -> Range { word_move(slice, range, count, WordMotionTarget::NextLongWordStart) } pub fn move_next_long_word_end(slice: RopeSlice, range: Range, count: usize) -> Range { word_move(slice, range, count, WordMotionTarget::NextLongWordEnd) } pub fn move_prev_long_word_start(slice: RopeSlice, range: Range, count: usize) -> Range { 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 { let is_prev = matches!( target, WordMotionTarget::PrevWordStart | WordMotionTarget::PrevLongWordStart | WordMotionTarget::PrevWordEnd ); // Special-case early-out. if (is_prev && range.head == 0) || (!is_prev && range.head == slice.len_chars()) { return range; } // Prepare the range appropriately based on the target movement // direction. This is addressing two things at once: // // 1. Block-cursor semantics. // 2. The anchor position being irrelevant to the output result. #[allow(clippy::collapsible_else_if)] // Makes the structure clearer in this case. let start_range = if is_prev { if range.anchor < range.head { Range::new(range.head, prev_grapheme_boundary(slice, range.head)) } else { Range::new(next_grapheme_boundary(slice, range.head), range.head) } } else { if range.anchor < range.head { Range::new(prev_grapheme_boundary(slice, range.head), range.head) } else { Range::new(range.head, next_grapheme_boundary(slice, range.head)) } }; // Do the main work. (0..count).fold(start_range, |r, _| { slice.chars_at(r.head).range_to_target(target, r) }) } // ---- util ------------ #[inline] /// Returns first index that doesn't satisfy a given predicate when /// advancing the character index. /// /// Returns none if all characters satisfy the predicate. pub fn skip_while(slice: RopeSlice, pos: usize, fun: F) -> Option where F: Fn(char) -> bool, { let mut chars = slice.chars_at(pos).enumerate(); chars.find_map(|(i, c)| if !fun(c) { Some(pos + i) } else { None }) } #[inline] /// Returns first index that doesn't satisfy a given predicate when /// retreating the character index, saturating if all elements satisfy /// the condition. pub fn backwards_skip_while(slice: RopeSlice, pos: usize, fun: F) -> Option where F: Fn(char) -> bool, { let mut chars_starting_from_next = slice.chars_at(pos + 1); let mut backwards = iter::from_fn(|| chars_starting_from_next.prev()).enumerate(); backwards.find_map(|(i, c)| { if !fun(c) { Some(pos.saturating_sub(i)) } else { None } }) } /// Possible targets of a word motion #[derive(Copy, Clone, Debug)] 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. NextLongWordStart, NextLongWordEnd, PrevLongWordStart, } pub trait CharHelpers { fn range_to_target(&mut self, target: WordMotionTarget, origin: Range) -> Range; } impl CharHelpers for Chars<'_> { /// Note: this only changes the anchor of the range if the head is effectively /// starting on a boundary (either directly or after skipping newline characters). /// Any other changes to the anchor should be handled by the calling code. fn range_to_target(&mut self, target: WordMotionTarget, origin: Range) -> Range { let is_prev = matches!( target, WordMotionTarget::PrevWordStart | WordMotionTarget::PrevLongWordStart | WordMotionTarget::PrevWordEnd ); // Reverse the iterator if needed for the motion direction. if is_prev { self.reverse(); } // Function to advance index in the appropriate motion direction. let advance: &dyn Fn(&mut usize) = if is_prev { &|idx| *idx = idx.saturating_sub(1) } else { &|idx| *idx += 1 }; // Initialize state variables. let mut anchor = origin.anchor; let mut head = origin.head; let mut prev_ch = { let ch = self.prev(); if ch.is_some() { self.next(); } ch }; // Skip any initial newline characters. while let Some(ch) = self.next() { if char_is_line_ending(ch) { prev_ch = Some(ch); advance(&mut head); } else { self.prev(); break; } } if prev_ch.map(char_is_line_ending).unwrap_or(false) { anchor = head; } // Find our target position(s). let head_start = head; while let Some(next_ch) = self.next() { if prev_ch.is_none() || reached_target(target, prev_ch.unwrap(), next_ch) { if head == head_start { anchor = head; } else { break; } } prev_ch = Some(next_ch); advance(&mut head); } // Un-reverse the iterator if needed. if is_prev { self.reverse(); } Range::new(anchor, head) } } fn is_word_boundary(a: char, b: char) -> bool { categorize_char(a) != categorize_char(b) } fn is_long_word_boundary(a: char, b: char) -> bool { match (categorize_char(a), categorize_char(b)) { (CharCategory::Word, CharCategory::Punctuation) | (CharCategory::Punctuation, CharCategory::Word) => false, (a, b) if a != b => true, _ => false, } } fn reached_target(target: WordMotionTarget, prev_ch: char, next_ch: char) -> bool { match target { WordMotionTarget::NextWordStart | WordMotionTarget::PrevWordEnd => { is_word_boundary(prev_ch, next_ch) && (char_is_line_ending(next_ch) || !next_ch.is_whitespace()) } WordMotionTarget::NextWordEnd | WordMotionTarget::PrevWordStart => { is_word_boundary(prev_ch, next_ch) && (!prev_ch.is_whitespace() || char_is_line_ending(next_ch)) } WordMotionTarget::NextLongWordStart => { is_long_word_boundary(prev_ch, next_ch) && (char_is_line_ending(next_ch) || !next_ch.is_whitespace()) } WordMotionTarget::NextLongWordEnd | WordMotionTarget::PrevLongWordStart => { is_long_word_boundary(prev_ch, next_ch) && (!prev_ch.is_whitespace() || char_is_line_ending(next_ch)) } } } #[cfg(test)] mod test { use std::array::{self, IntoIter}; use ropey::Rope; use super::*; const SINGLE_LINE_SAMPLE: &str = "This is a simple alphabetic line"; const MULTILINE_SAMPLE: &str = "\ Multiline\n\ text sample\n\ which\n\ is merely alphabetic\n\ and whitespaced\n\ "; const MULTIBYTE_CHARACTER_SAMPLE: &str = "\ パーティーへ行かないか\n\ The text above is Japanese\n\ "; #[test] fn test_vertical_move() { let text = Rope::from("abcd\nefg\nwrs"); let slice = text.slice(..); let pos = pos_at_coords(slice, (0, 4).into(), true); let range = Range::new(pos, pos); assert_eq!( coords_at_pos( slice, move_vertically(slice, range, Direction::Forward, 1, Movement::Move).head ), (1, 3).into() ); } #[test] fn horizontal_moves_through_single_line_text() { let text = Rope::from(SINGLE_LINE_SAMPLE); let slice = text.slice(..); let position = pos_at_coords(slice, (0, 0).into(), true); let mut range = Range::point(position); let moves_and_expected_coordinates = [ ((Direction::Forward, 1usize), (0, 1)), // T|his is a simple alphabetic line ((Direction::Forward, 2usize), (0, 3)), // Thi|s is a simple alphabetic line ((Direction::Forward, 0usize), (0, 3)), // Thi|s is a simple alphabetic line ((Direction::Forward, 999usize), (0, 32)), // This is a simple alphabetic line| ((Direction::Forward, 999usize), (0, 32)), // This is a simple alphabetic line| ((Direction::Backward, 999usize), (0, 0)), // |This is a simple alphabetic line ]; for ((direction, amount), coordinates) in IntoIter::new(moves_and_expected_coordinates) { range = move_horizontally(slice, range, direction, amount, Movement::Move); assert_eq!(coords_at_pos(slice, range.head), coordinates.into()) } } #[test] fn horizontal_moves_through_multiline_text() { let text = Rope::from(MULTILINE_SAMPLE); let slice = text.slice(..); let position = pos_at_coords(slice, (0, 0).into(), true); let mut range = Range::point(position); let moves_and_expected_coordinates = IntoIter::new([ ((Direction::Forward, 11usize), (1, 1)), // Multiline\nt|ext sample\n... ((Direction::Backward, 1usize), (1, 0)), // Multiline\n|text sample\n... ((Direction::Backward, 5usize), (0, 5)), // Multi|line\ntext sample\n... ((Direction::Backward, 999usize), (0, 0)), // |Multiline\ntext sample\n... ((Direction::Forward, 3usize), (0, 3)), // Mul|tiline\ntext sample\n... ((Direction::Forward, 0usize), (0, 3)), // Mul|tiline\ntext sample\n... ((Direction::Backward, 0usize), (0, 3)), // Mul|tiline\ntext sample\n... ((Direction::Forward, 999usize), (5, 0)), // ...and whitespaced\n| ((Direction::Forward, 999usize), (5, 0)), // ...and whitespaced\n| ]); for ((direction, amount), coordinates) in moves_and_expected_coordinates { range = move_horizontally(slice, range, direction, amount, Movement::Move); assert_eq!(coords_at_pos(slice, range.head), coordinates.into()); assert_eq!(range.head, range.anchor); } } #[test] fn selection_extending_moves_in_single_line_text() { let text = Rope::from(SINGLE_LINE_SAMPLE); let slice = text.slice(..); let position = pos_at_coords(slice, (0, 0).into(), true); let mut range = Range::point(position); let original_anchor = range.anchor; let moves = IntoIter::new([ (Direction::Forward, 1usize), (Direction::Forward, 5usize), (Direction::Backward, 3usize), ]); for (direction, amount) in moves { range = move_horizontally(slice, range, direction, amount, Movement::Extend); assert_eq!(range.anchor, original_anchor); } } #[test] fn vertical_moves_in_single_column() { let text = Rope::from(MULTILINE_SAMPLE); let slice = text.slice(..); let position = pos_at_coords(slice, (0, 0).into(), true); let mut range = Range::point(position); let moves_and_expected_coordinates = IntoIter::new([ ((Direction::Forward, 1usize), (1, 0)), ((Direction::Forward, 2usize), (3, 0)), ((Direction::Forward, 1usize), (4, 0)), ((Direction::Backward, 999usize), (0, 0)), ((Direction::Forward, 4usize), (4, 0)), ((Direction::Forward, 0usize), (4, 0)), ((Direction::Backward, 0usize), (4, 0)), ((Direction::Forward, 5), (5, 0)), ((Direction::Forward, 999usize), (5, 0)), ]); for ((direction, amount), coordinates) in moves_and_expected_coordinates { range = move_vertically(slice, range, direction, amount, Movement::Move); assert_eq!(coords_at_pos(slice, range.head), coordinates.into()); assert_eq!(range.head, range.anchor); } } #[test] fn vertical_moves_jumping_column() { let text = Rope::from(MULTILINE_SAMPLE); let slice = text.slice(..); let position = pos_at_coords(slice, (0, 0).into(), true); let mut range = Range::point(position); enum Axis { H, V, } let moves_and_expected_coordinates = IntoIter::new([ // Places cursor at the end of line ((Axis::H, Direction::Forward, 8usize), (0, 8)), // First descent preserves column as the target line is wider ((Axis::V, Direction::Forward, 1usize), (1, 8)), // Second descent clamps column as the target line is shorter ((Axis::V, Direction::Forward, 1usize), (2, 5)), // Third descent restores the original column ((Axis::V, Direction::Forward, 1usize), (3, 8)), // Behaviour is preserved even through long jumps ((Axis::V, Direction::Backward, 999usize), (0, 8)), ((Axis::V, Direction::Forward, 4usize), (4, 8)), ((Axis::V, Direction::Forward, 999usize), (5, 0)), ]); for ((axis, direction, amount), coordinates) in moves_and_expected_coordinates { range = match axis { Axis::H => move_horizontally(slice, range, direction, amount, Movement::Move), Axis::V => move_vertically(slice, range, direction, amount, Movement::Move), }; assert_eq!(coords_at_pos(slice, range.head), coordinates.into()); assert_eq!(range.head, range.anchor); } } #[test] fn multibyte_character_wide_column_jumps() { let text = Rope::from(MULTIBYTE_CHARACTER_SAMPLE); let slice = text.slice(..); let position = pos_at_coords(slice, (0, 0).into(), true); let mut range = Range::point(position); // FIXME: The behaviour captured in this test diverges from both Kakoune and Vim. These // will attempt to preserve the horizontal position of the cursor, rather than // placing it at the same character index. enum Axis { H, V, } let moves_and_expected_coordinates = IntoIter::new([ // Places cursor at the fourth kana. ((Axis::H, Direction::Forward, 4), (0, 4)), // Descent places cursor at the 4th character. ((Axis::V, Direction::Forward, 1usize), (1, 4)), // Moving back 1 character. ((Axis::H, Direction::Backward, 1usize), (1, 3)), // Jumping back up 1 line. ((Axis::V, Direction::Backward, 1usize), (0, 3)), ]); for ((axis, direction, amount), coordinates) in moves_and_expected_coordinates { range = match axis { Axis::H => move_horizontally(slice, range, direction, amount, Movement::Move), Axis::V => move_vertically(slice, range, direction, amount, Movement::Move), }; assert_eq!(coords_at_pos(slice, range.head), coordinates.into()); assert_eq!(range.head, range.anchor); } } #[test] #[should_panic] fn nonsensical_ranges_panic_on_forward_movement_attempt_in_debug_mode() { move_next_word_start(Rope::from("Sample").slice(..), Range::point(99999999), 1); } #[test] #[should_panic] fn nonsensical_ranges_panic_on_forward_to_end_movement_attempt_in_debug_mode() { move_next_word_end(Rope::from("Sample").slice(..), Range::point(99999999), 1); } #[test] #[should_panic] fn nonsensical_ranges_panic_on_backwards_movement_attempt_in_debug_mode() { move_prev_word_start(Rope::from("Sample").slice(..), Range::point(99999999), 1); } #[test] fn test_behaviour_when_moving_to_start_of_next_words() { let tests = array::IntoIter::new([ ("Basic forward motion stops at the first space", vec![(1, Range::new(0, 0), Range::new(0, 6))]), (" Starting from a boundary advances the anchor", vec![(1, Range::new(0, 0), Range::new(1, 10))]), ("Long whitespace gap is bridged by the head", vec![(1, Range::new(0, 0), Range::new(0, 11))]), ("Previous anchor is irrelevant for forward motions", vec![(1, Range::new(12, 0), Range::new(0, 9))]), (" Starting from whitespace moves to last space in sequence", vec![(1, Range::new(0, 0), Range::new(0, 4))]), ("Starting from mid-word leaves anchor at start position and moves head", vec![(1, Range::new(3, 3), Range::new(3, 9))]), ("Identifiers_with_underscores are considered a single word", vec![(1, Range::new(0, 0), Range::new(0, 29))]), ("Jumping\n into starting whitespace selects the spaces before 'into'", vec![(1, Range::new(0, 7), Range::new(8, 12))]), ("alphanumeric.!,and.?=punctuation are considered 'words' for the purposes of word motion", vec![ (1, Range::new(0, 0), Range::new(0, 12)), (1, Range::new(0, 12), Range::new(12, 15)), (1, Range::new(12, 15), Range::new(15, 18)) ]), ("... ... punctuation and spaces behave as expected", vec![ (1, Range::new(0, 0), Range::new(0, 6)), (1, Range::new(0, 6), Range::new(6, 10)), ]), (".._.._ punctuation is not joined by underscores into a single block", vec![(1, Range::new(0, 0), Range::new(0, 2))]), ("Newlines\n\nare bridged seamlessly.", vec![ (1, Range::new(0, 0), Range::new(0, 8)), (1, Range::new(0, 8), Range::new(10, 14)), ]), ("Jumping\n\n\n\n\n\n from newlines to whitespace selects whitespace.", vec![ (1, Range::new(0, 9), Range::new(13, 16)), ]), ("A failed motion does not modify the range", vec![ (3, Range::new(37, 41), Range::new(37, 41)), ]), ("oh oh oh two character words!", vec![ (1, Range::new(0, 0), Range::new(0, 3)), (1, Range::new(0, 3), Range::new(3, 6)), (1, Range::new(0, 2), Range::new(1, 3)), ]), ("Multiple motions at once resolve correctly", vec![ (3, Range::new(0, 0), Range::new(17, 20)), ]), ("Excessive motions are performed partially", vec![ (999, Range::new(0, 0), Range::new(32, 41)), ]), ("", // Edge case of moving forward in empty string vec![ (1, Range::new(0, 0), Range::new(0, 0)), ]), ("\n\n\n\n\n", // Edge case of moving forward in all newlines vec![ (1, Range::new(0, 0), Range::new(5, 5)), ]), ("\n \n \n Jumping through alternated space blocks and newlines selects the space blocks", vec![ (1, Range::new(0, 0), Range::new(1, 4)), (1, Range::new(1, 4), Range::new(5, 8)), ]), ("ヒーリクス multibyte characters behave as normal characters", vec![ (1, Range::new(0, 0), Range::new(0, 6)), ]), ]); for (sample, scenario) in tests { for (count, begin, expected_end) in scenario.into_iter() { let range = move_next_word_start(Rope::from(sample).slice(..), begin, count); assert_eq!(range, expected_end, "Case failed: [{}]", sample); } } } #[test] fn test_behaviour_when_moving_to_start_of_next_long_words() { let tests = array::IntoIter::new([ ("Basic forward motion stops at the first space", vec![(1, Range::new(0, 0), Range::new(0, 6))]), (" Starting from a boundary advances the anchor", vec![(1, Range::new(0, 0), Range::new(1, 10))]), ("Long whitespace gap is bridged by the head", vec![(1, Range::new(0, 0), Range::new(0, 11))]), ("Previous anchor is irrelevant for forward motions", vec![(1, Range::new(12, 0), Range::new(0, 9))]), (" Starting from whitespace moves to last space in sequence", vec![(1, Range::new(0, 0), Range::new(0, 4))]), ("Starting from mid-word leaves anchor at start position and moves head", vec![(1, Range::new(3, 3), Range::new(3, 9))]), ("Identifiers_with_underscores are considered a single word", vec![(1, Range::new(0, 0), Range::new(0, 29))]), ("Jumping\n into starting whitespace selects the spaces before 'into'", vec![(1, Range::new(0, 7), Range::new(8, 12))]), ("alphanumeric.!,and.?=punctuation are not treated any differently than alphanumerics", vec![ (1, Range::new(0, 0), Range::new(0, 33)), ]), ("... ... punctuation and spaces behave as expected", vec![ (1, Range::new(0, 0), Range::new(0, 6)), (1, Range::new(0, 6), Range::new(6, 10)), ]), (".._.._ punctuation is joined by underscores into a single word, as it behaves like alphanumerics", vec![(1, Range::new(0, 0), Range::new(0, 7))]), ("Newlines\n\nare bridged seamlessly.", vec![ (1, Range::new(0, 0), Range::new(0, 8)), (1, Range::new(0, 8), Range::new(10, 14)), ]), ("Jumping\n\n\n\n\n\n from newlines to whitespace selects whitespace.", vec![ (1, Range::new(0, 9), Range::new(13, 16)), ]), ("A failed motion does not modify the range", vec![ (3, Range::new(37, 41), Range::new(37, 41)), ]), ("oh oh oh two character words!", vec![ (1, Range::new(0, 0), Range::new(0, 3)), (1, Range::new(0, 3), Range::new(3, 6)), (1, Range::new(0, 1), Range::new(0, 3)), ]), ("Multiple motions at once resolve correctly", vec![ (3, Range::new(0, 0), Range::new(17, 20)), ]), ("Excessive motions are performed partially", vec![ (999, Range::new(0, 0), Range::new(32, 41)), ]), ("", // Edge case of moving forward in empty string vec![ (1, Range::new(0, 0), Range::new(0, 0)), ]), ("\n\n\n\n\n", // Edge case of moving forward in all newlines vec![ (1, Range::new(0, 0), Range::new(5, 5)), ]), ("\n \n \n Jumping through alternated space blocks and newlines selects the space blocks", vec![ (1, Range::new(0, 0), Range::new(1, 4)), (1, Range::new(1, 4), Range::new(5, 8)), ]), ("ヒー..リクス multibyte characters behave as normal characters, including their interaction with punctuation", vec![ (1, Range::new(0, 0), Range::new(0, 8)), ]), ]); for (sample, scenario) in tests { for (count, begin, expected_end) in scenario.into_iter() { let range = move_next_long_word_start(Rope::from(sample).slice(..), begin, count); assert_eq!(range, expected_end, "Case failed: [{}]", sample); } } } #[test] fn test_behaviour_when_moving_to_start_of_previous_words() { let tests = array::IntoIter::new([ ("Basic backward motion from the middle of a word", vec![(1, Range::new(3, 3), Range::new(4, 0))]), // // Why do we want this behavior? The current behavior fails this // // test, but seems better and more consistent. // ("Starting from after boundary retreats the anchor", // vec![(1, Range::new(0, 9), Range::new(8, 0))]), (" Jump to start of a word preceded by whitespace", vec![(1, Range::new(5, 5), Range::new(6, 4))]), (" Jump to start of line from start of word preceded by whitespace", vec![(1, Range::new(4, 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 considered 'words' for the purposes of word motion", vec![ (1, Range::new(29, 30), Range::new(30, 21)), (1, Range::new(30, 21), Range::new(21, 18)), (1, Range::new(21, 18), Range::new(18, 15)) ]), ("... ... punctuation and spaces behave as expected", vec![ (1, Range::new(0, 10), Range::new(10, 6)), (1, Range::new(10, 6), Range::new(6, 0)), ]), (".._.._ punctuation is not joined by underscores into a single block", vec![(1, Range::new(0, 6), Range::new(5, 3))]), ("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, 0)), ]), ("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(18, 18), Range::new(9, 0)), ]), ("Excessive motions are performed partially", vec![ (999, Range::new(40, 40), Range::new(10, 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", vec![ (1, Range::new(0, 6), Range::new(6, 0)), ]), ]); for (sample, scenario) in tests { for (count, begin, expected_end) in scenario.into_iter() { let range = move_prev_word_start(Rope::from(sample).slice(..), begin, count); assert_eq!(range, expected_end, "Case failed: [{}]", sample); } } } #[test] fn test_behaviour_when_moving_to_start_of_previous_long_words() { let tests = array::IntoIter::new([ ( "Basic backward motion from the middle of a word", vec![(1, Range::new(3, 3), Range::new(4, 0))], ), // // Why do we want this behavior? The current behavior fails this // // test, but seems better and more consistent. // ("Starting from after boundary retreats the anchor", // vec![(1, Range::new(0, 9), Range::new(8, 0))]), ( " Jump to start of a word preceded by whitespace", vec![(1, Range::new(5, 5), Range::new(6, 4))], ), ( " Jump to start of line from start 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(10, 6)), (1, Range::new(10, 6), Range::new(6, 0)), ], ), (".._.._ 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, 0))], ), ( "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(9, 0))], ), ( "Excessive motions are performed partially", vec![(999, Range::new(40, 40), Range::new(10, 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(8, 0)), ]), ]); for (sample, scenario) in tests { for (count, begin, expected_end) in scenario.into_iter() { let range = move_prev_long_word_start(Rope::from(sample).slice(..), begin, count); assert_eq!(range, expected_end, "Case failed: [{}]", sample); } } } #[test] fn test_behaviour_when_moving_to_end_of_next_words() { let tests = array::IntoIter::new([ ("Basic forward motion from the start of a word to the end of it", vec![(1, Range::new(0, 0), Range::new(0, 5))]), ("Basic forward motion from the end of a word to the end of the next", vec![(1, Range::new(0, 5), Range::new(5, 13))]), ("Basic forward motion from the middle of a word to the end of it", vec![(1, Range::new(2, 2), Range::new(2, 5))]), (" Jumping to end of a word preceded by whitespace", vec![(1, Range::new(0, 0), Range::new(0, 11))]), // // Why do we want this behavior? The current behavior fails this // // test, but seems better and more consistent. // (" Starting from a boundary advances the anchor", // vec![(1, Range::new(0, 0), Range::new(1, 9))]), ("Previous anchor is irrelevant for end of word motion", vec![(1, Range::new(12, 2), Range::new(2, 8))]), ("Identifiers_with_underscores are considered a single word", vec![(1, Range::new(0, 0), Range::new(0, 28))]), ("Jumping\n into starting whitespace selects up to the end of next word", vec![(1, Range::new(0, 7), Range::new(8, 16))]), ("alphanumeric.!,and.?=punctuation are considered 'words' for the purposes of word motion", vec![ (1, Range::new(0, 0), Range::new(0, 12)), (1, Range::new(0, 12), Range::new(12, 15)), (1, Range::new(12, 15), Range::new(15, 18)) ]), ("... ... punctuation and spaces behave as expected", vec![ (1, Range::new(0, 0), Range::new(0, 3)), (1, Range::new(0, 3), Range::new(3, 9)), ]), (".._.._ punctuation is not joined by underscores into a single block", vec![(1, Range::new(0, 0), Range::new(0, 2))]), ("Newlines\n\nare bridged seamlessly.", vec![ (1, Range::new(0, 0), Range::new(0, 8)), (1, Range::new(0, 8), Range::new(10, 13)), ]), ("Jumping\n\n\n\n\n\n from newlines to whitespace selects to end of next word.", vec![ (1, Range::new(0, 8), Range::new(13, 20)), ]), ("A failed motion does not modify the range", vec![ (3, Range::new(37, 41), Range::new(37, 41)), ]), ("Multiple motions at once resolve correctly", vec![ (3, Range::new(0, 0), Range::new(16, 19)), ]), ("Excessive motions are performed partially", vec![ (999, Range::new(0, 0), Range::new(31, 41)), ]), ("", // Edge case of moving forward in empty string vec![ (1, Range::new(0, 0), Range::new(0, 0)), ]), ("\n\n\n\n\n", // Edge case of moving forward in all newlines vec![ (1, Range::new(0, 0), Range::new(5, 5)), ]), ("\n \n \n Jumping through alternated space blocks and newlines selects the space blocks", vec![ (1, Range::new(0, 0), Range::new(1, 4)), (1, Range::new(1, 4), Range::new(5, 8)), ]), ("ヒーリクス multibyte characters behave as normal characters", vec![ (1, Range::new(0, 0), Range::new(0, 5)), ]), ]); for (sample, scenario) in tests { for (count, begin, expected_end) in scenario.into_iter() { let range = move_next_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_previous_words() { let tests = array::IntoIter::new([ ("Basic backward motion from the middle of a word", vec![(1, Range::new(9, 9), Range::new(10, 5))]), ("Starting from after boundary retreats the anchor", vec![(1, Range::new(0, 14), Range::new(13, 8))]), ("Jump to end of a word succeeded by whitespace", vec![(1, Range::new(11, 11), Range::new(11, 4))]), (" Jump to start of line from end of word preceded by whitespace", vec![(1, Range::new(8, 8), Range::new(8, 0))]), ("Previous anchor is irrelevant for backward motions", vec![(1, Range::new(26, 12), Range::new(13, 8))]), (" Starting from whitespace moves to first space in sequence", vec![(1, Range::new(0, 4), Range::new(4, 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(12, 8))]), ("Jumping to start of word from the end selects the whole word", vec![(1, Range::new(16, 16), Range::new(16, 10))]), ("alphanumeric.!,and.?=punctuation are considered 'words' for the purposes of word motion", vec![ (1, Range::new(30, 30), Range::new(31, 21)), (1, Range::new(31, 21), Range::new(21, 18)), (1, Range::new(21, 18), Range::new(18, 15)) ]), ("... ... punctuation and spaces behave as expected", vec![ (1, Range::new(0, 10), Range::new(9, 3)), (1, Range::new(9, 3), Range::new(3, 0)), ]), (".._.._ punctuation is not joined by underscores into a single block", vec![(1, Range::new(0, 5), Range::new(5, 3))]), ("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(24, 24), Range::new(16, 8)), ]), ("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)), ]), ("Test ヒーリクス multibyte characters behave as normal characters", vec![ (1, Range::new(0, 10), Range::new(10, 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", vec![(1, Range::new(0, 0), Range::new(0, 5))]), ("Basic forward motion from the end of a word to the end of the next", vec![(1, Range::new(0, 5), Range::new(5, 13))]), ("Basic forward motion from the middle of a word to the end of it", vec![(1, Range::new(2, 2), Range::new(2, 5))]), (" Jumping to end of a word preceded by whitespace", vec![(1, Range::new(0, 0), Range::new(0, 11))]), // // Why do we want this behavior? The current behavior fails this // // test, but seems better and more consistent. // (" Starting from a boundary advances the anchor", // vec![(1, Range::new(0, 0), Range::new(1, 9))]), ("Previous anchor is irrelevant for end of word motion", vec![(1, Range::new(12, 2), Range::new(2, 8))]), ("Identifiers_with_underscores are considered a single word", vec![(1, Range::new(0, 0), Range::new(0, 28))]), ("Jumping\n into starting whitespace selects up to the end of next word", vec![(1, Range::new(0, 7), Range::new(8, 16))]), ("alphanumeric.!,and.?=punctuation are treated the same way", vec![ (1, Range::new(0, 0), Range::new(0, 32)), ]), ("... ... punctuation and spaces behave as expected", vec![ (1, Range::new(0, 0), Range::new(0, 3)), (1, Range::new(0, 3), Range::new(3, 9)), ]), (".._.._ punctuation is joined by underscores into a single block", vec![(1, Range::new(0, 0), Range::new(0, 6))]), ("Newlines\n\nare bridged seamlessly.", vec![ (1, Range::new(0, 0), Range::new(0, 8)), (1, Range::new(0, 8), Range::new(10, 13)), ]), ("Jumping\n\n\n\n\n\n from newlines to whitespace selects to end of next word.", vec![ (1, Range::new(0, 9), Range::new(13, 20)), ]), ("A failed motion does not modify the range", vec![ (3, Range::new(37, 41), Range::new(37, 41)), ]), ("Multiple motions at once resolve correctly", vec![ (3, Range::new(0, 0), Range::new(16, 19)), ]), ("Excessive motions are performed partially", vec![ (999, Range::new(0, 0), Range::new(31, 41)), ]), ("", // Edge case of moving forward in empty string vec![ (1, Range::new(0, 0), Range::new(0, 0)), ]), ("\n\n\n\n\n", // Edge case of moving forward in all newlines vec![ (1, Range::new(0, 0), Range::new(5, 5)), ]), ("\n \n \n Jumping through alternated space blocks and newlines selects the space blocks", vec![ (1, Range::new(0, 0), Range::new(1, 4)), (1, Range::new(1, 4), Range::new(5, 8)), ]), ("ヒーリ..クス multibyte characters behave as normal characters, including when they interact with punctuation", vec![ (1, Range::new(0, 0), Range::new(0, 7)), ]), ]); for (sample, scenario) in tests { for (count, begin, expected_end) in scenario.into_iter() { let range = move_next_long_word_end(Rope::from(sample).slice(..), begin, count); assert_eq!(range, expected_end, "Case failed: [{}]", sample); } } } }