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helix/helix-core/src/movement.rs

1435 lines
57 KiB
Rust

use std::iter;
use ropey::iter::Chars;
use tree_sitter::{Node, QueryCursor};
use crate::{
chars::{categorize_char, char_is_line_ending, CharCategory},
graphemes::{
next_grapheme_boundary, nth_next_grapheme_boundary, nth_prev_grapheme_boundary,
prev_grapheme_boundary,
},
line_ending::rope_is_line_ending,
pos_at_visual_coords,
syntax::LanguageConfiguration,
textobject::TextObject,
visual_coords_at_pos, 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,
_: usize,
) -> 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,
tab_width: usize,
) -> Range {
let pos = range.cursor(slice);
// Compute the current position's 2d coordinates.
let Position { row, col } = visual_coords_at_pos(slice, pos, tab_width);
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_visual_coords(slice, Position::new(new_row, new_col), tab_width);
// 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)
})
}
pub fn move_prev_paragraph(
slice: RopeSlice,
range: Range,
count: usize,
behavior: Movement,
) -> Range {
let mut line = range.cursor_line(slice);
let first_char = slice.line_to_char(line) == range.cursor(slice);
let prev_line_empty = rope_is_line_ending(slice.line(line.saturating_sub(1)));
let curr_line_empty = rope_is_line_ending(slice.line(line));
let prev_empty_to_line = prev_line_empty && !curr_line_empty;
// skip character before paragraph boundary
if prev_empty_to_line && !first_char {
line += 1;
}
let mut lines = slice.lines_at(line);
lines.reverse();
let mut lines = lines.map(rope_is_line_ending).peekable();
for _ in 0..count {
while lines.next_if(|&e| e).is_some() {
line -= 1;
}
while lines.next_if(|&e| !e).is_some() {
line -= 1;
}
}
let head = slice.line_to_char(line);
let anchor = if behavior == Movement::Move {
// exclude first character after paragraph boundary
if prev_empty_to_line && first_char {
range.cursor(slice)
} else {
range.head
}
} else {
range.put_cursor(slice, head, true).anchor
};
Range::new(anchor, head)
}
pub fn move_next_paragraph(
slice: RopeSlice,
range: Range,
count: usize,
behavior: Movement,
) -> Range {
let mut line = range.cursor_line(slice);
let last_char =
prev_grapheme_boundary(slice, slice.line_to_char(line + 1)) == range.cursor(slice);
let curr_line_empty = rope_is_line_ending(slice.line(line));
let next_line_empty =
rope_is_line_ending(slice.line(slice.len_lines().saturating_sub(1).min(line + 1)));
let curr_empty_to_line = curr_line_empty && !next_line_empty;
// skip character after paragraph boundary
if curr_empty_to_line && last_char {
line += 1;
}
let mut lines = slice.lines_at(line).map(rope_is_line_ending).peekable();
for _ in 0..count {
while lines.next_if(|&e| !e).is_some() {
line += 1;
}
while lines.next_if(|&e| e).is_some() {
line += 1;
}
}
let head = slice.line_to_char(line);
let anchor = if behavior == Movement::Move {
if curr_empty_to_line && last_char {
range.head
} else {
range.cursor(slice)
}
} else {
range.put_cursor(slice, head, true).anchor
};
Range::new(anchor, head)
}
// ---- 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<F>(slice: RopeSlice, pos: usize, fun: F) -> Option<usize>
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<F>(slice: RopeSlice, pos: usize, fun: F) -> Option<usize>
where
F: Fn(char) -> bool,
{
let mut chars_starting_from_next = slice.chars_at(pos);
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;
#[allow(clippy::while_let_on_iterator)] // Clippy's suggestion to fix doesn't work here.
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))
}
}
}
/// Finds the range of the next or previous textobject in the syntax sub-tree of `node`.
/// Returns the range in the forwards direction.
pub fn goto_treesitter_object(
slice: RopeSlice,
range: Range,
object_name: &str,
dir: Direction,
slice_tree: Node,
lang_config: &LanguageConfiguration,
count: usize,
) -> Range {
let get_range = move |range: Range| -> Option<Range> {
let byte_pos = slice.char_to_byte(range.cursor(slice));
let cap_name = |t: TextObject| format!("{}.{}", object_name, t);
let mut cursor = QueryCursor::new();
let nodes = lang_config.textobject_query()?.capture_nodes_any(
&[
&cap_name(TextObject::Movement),
&cap_name(TextObject::Around),
&cap_name(TextObject::Inside),
],
slice_tree,
slice,
&mut cursor,
)?;
let node = match dir {
Direction::Forward => nodes
.filter(|n| n.start_byte() > byte_pos)
.min_by_key(|n| n.start_byte())?,
Direction::Backward => nodes
.filter(|n| n.end_byte() < byte_pos)
.max_by_key(|n| n.end_byte())?,
};
let len = slice.len_bytes();
let start_byte = node.start_byte();
let end_byte = node.end_byte();
if start_byte >= len || end_byte >= len {
return None;
}
let start_char = slice.byte_to_char(start_byte);
let end_char = slice.byte_to_char(end_byte);
// head of range should be at beginning
Some(Range::new(start_char, end_char))
};
(0..count).fold(range, |range, _| get_range(range).unwrap_or(range))
}
#[cfg(test)]
mod test {
use ropey::Rope;
use crate::{coords_at_pos, pos_at_coords};
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 = "\
\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, 4).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 moves_and_expected_coordinates {
range = move_horizontally(slice, range, direction, amount, Movement::Move, 0);
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 = [
((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, 0);
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 = [
(Direction::Forward, 1usize),
(Direction::Forward, 5usize),
(Direction::Backward, 3usize),
];
for (direction, amount) in moves {
range = move_horizontally(slice, range, direction, amount, Movement::Extend, 0);
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 = [
((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, 4);
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 = [
// 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, 0),
Axis::V => move_vertically(slice, range, direction, amount, Movement::Move, 4),
};
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 = [
// Places cursor at the fourth kana.
((Axis::H, Direction::Forward, 4), (0, 4)),
// Descent places cursor at the 8th character.
((Axis::V, Direction::Forward, 1usize), (1, 8)),
// Moving back 2 characters.
((Axis::H, Direction::Backward, 2usize), (1, 6)),
// 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, 0),
Axis::V => move_vertically(slice, range, direction, amount, Movement::Move, 4),
};
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 = [
("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)),
]),
(" 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 = [
("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)),
]),
(".. 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 = [
("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)),
]),
(" 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 = [
(
"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)),
]),
(".. 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 = [
("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)),
]),
(" 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 = [
("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 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 = [
("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)),
]),
(".. 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);
}
}
}
#[test]
fn test_behaviour_when_moving_to_prev_paragraph_single() {
let tests = [
("#[|]#", "#[|]#"),
("#[s|]#tart at\nfirst char\n", "#[|s]#tart at\nfirst char\n"),
("start at\nlast char#[\n|]#", "#[|start at\nlast char\n]#"),
(
"goto\nfirst\n\n#[p|]#aragraph",
"#[|goto\nfirst\n\n]#paragraph",
),
(
"goto\nfirst\n#[\n|]#paragraph",
"#[|goto\nfirst\n\n]#paragraph",
),
(
"goto\nsecond\n\np#[a|]#ragraph",
"goto\nsecond\n\n#[|pa]#ragraph",
),
(
"here\n\nhave\nmultiple\nparagraph\n\n\n\n\n#[|]#",
"here\n\n#[|have\nmultiple\nparagraph\n\n\n\n\n]#",
),
];
for (before, expected) in tests {
let (s, selection) = crate::test::print(before);
let text = Rope::from(s.as_str());
let selection =
selection.transform(|r| move_prev_paragraph(text.slice(..), r, 1, Movement::Move));
let actual = crate::test::plain(&s, selection);
assert_eq!(actual, expected, "\nbefore: `{:?}`", before);
}
}
#[test]
fn test_behaviour_when_moving_to_prev_paragraph_double() {
let tests = [
(
"on#[e|]#\n\ntwo\n\nthree\n\n",
"#[|one]#\n\ntwo\n\nthree\n\n",
),
(
"one\n\ntwo\n\nth#[r|]#ee\n\n",
"one\n\n#[|two\n\nthr]#ee\n\n",
),
];
for (before, expected) in tests {
let (s, selection) = crate::test::print(before);
let text = Rope::from(s.as_str());
let selection =
selection.transform(|r| move_prev_paragraph(text.slice(..), r, 2, Movement::Move));
let actual = crate::test::plain(&s, selection);
assert_eq!(actual, expected, "\nbefore: `{:?}`", before);
}
}
#[test]
fn test_behaviour_when_moving_to_prev_paragraph_extend() {
let tests = [
(
"one\n\n#[|two\n\n]#three\n\n",
"#[|one\n\ntwo\n\n]#three\n\n",
),
(
"#[|one\n\ntwo\n\n]#three\n\n",
"#[|one\n\ntwo\n\n]#three\n\n",
),
];
for (before, expected) in tests {
let (s, selection) = crate::test::print(before);
let text = Rope::from(s.as_str());
let selection = selection
.transform(|r| move_prev_paragraph(text.slice(..), r, 1, Movement::Extend));
let actual = crate::test::plain(&s, selection);
assert_eq!(actual, expected, "\nbefore: `{:?}`", before);
}
}
#[test]
fn test_behaviour_when_moving_to_next_paragraph_single() {
let tests = [
("#[|]#", "#[|]#"),
("#[s|]#tart at\nfirst char\n", "#[start at\nfirst char\n|]#"),
("start at\nlast char#[\n|]#", "start at\nlast char#[\n|]#"),
(
"a\nb\n\n#[g|]#oto\nthird\n\nparagraph",
"a\nb\n\n#[goto\nthird\n\n|]#paragraph",
),
(
"a\nb\n#[\n|]#goto\nthird\n\nparagraph",
"a\nb\n\n#[goto\nthird\n\n|]#paragraph",
),
(
"a\nb#[\n|]#\ngoto\nsecond\n\nparagraph",
"a\nb#[\n\n|]#goto\nsecond\n\nparagraph",
),
(
"here\n\nhave\n#[m|]#ultiple\nparagraph\n\n\n\n\n",
"here\n\nhave\n#[multiple\nparagraph\n\n\n\n\n|]#",
),
(
"#[t|]#ext\n\n\nafter two blank lines\n\nmore text\n",
"#[text\n\n\n|]#after two blank lines\n\nmore text\n",
),
(
"#[text\n\n\n|]#after two blank lines\n\nmore text\n",
"text\n\n\n#[after two blank lines\n\n|]#more text\n",
),
];
for (before, expected) in tests {
let (s, selection) = crate::test::print(before);
let text = Rope::from(s.as_str());
let selection =
selection.transform(|r| move_next_paragraph(text.slice(..), r, 1, Movement::Move));
let actual = crate::test::plain(&s, selection);
assert_eq!(actual, expected, "\nbefore: `{:?}`", before);
}
}
#[test]
fn test_behaviour_when_moving_to_next_paragraph_double() {
let tests = [
(
"one\n\ntwo\n\nth#[r|]#ee\n\n",
"one\n\ntwo\n\nth#[ree\n\n|]#",
),
(
"on#[e|]#\n\ntwo\n\nthree\n\n",
"on#[e\n\ntwo\n\n|]#three\n\n",
),
];
for (before, expected) in tests {
let (s, selection) = crate::test::print(before);
let text = Rope::from(s.as_str());
let selection =
selection.transform(|r| move_next_paragraph(text.slice(..), r, 2, Movement::Move));
let actual = crate::test::plain(&s, selection);
assert_eq!(actual, expected, "\nbefore: `{:?}`", before);
}
}
#[test]
fn test_behaviour_when_moving_to_next_paragraph_extend() {
let tests = [
(
"one\n\n#[two\n\n|]#three\n\n",
"one\n\n#[two\n\nthree\n\n|]#",
),
(
"one\n\n#[two\n\nthree\n\n|]#",
"one\n\n#[two\n\nthree\n\n|]#",
),
];
for (before, expected) in tests {
let (s, selection) = crate::test::print(before);
let text = Rope::from(s.as_str());
let selection = selection
.transform(|r| move_next_paragraph(text.slice(..), r, 1, Movement::Extend));
let actual = crate::test::plain(&s, selection);
assert_eq!(actual, expected, "\nbefore: `{:?}`", before);
}
}
}