fix extend-to commands not combining cursors

This commit is contained in:
alice pellerin
2026-04-13 01:09:23 -05:00
parent a689949044
commit 901350508d
4 changed files with 188 additions and 612 deletions
+2 -440
View File
@@ -1,5 +1,6 @@
use std::{cmp::{max, min}, mem::swap, ops::RangeInclusive};
use crate::{BYTES_PER_LINE, action::CursorAction};
mod actions;
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
pub struct Cursor {
@@ -75,443 +76,4 @@ impl Cursor {
self.tail = min(self.tail, other.tail);
}
}
pub fn execute(
&mut self,
action: CursorAction,
max_contents_index: usize
) {
match action {
CursorAction::MoveByteUp => self.move_byte_up(),
CursorAction::MoveByteDown => self.move_byte_down(max_contents_index),
CursorAction::MoveByteLeft => self.move_byte_left(),
CursorAction::MoveByteRight => self.move_byte_right(max_contents_index),
CursorAction::ExtendByteUp => self.extend_byte_up(),
CursorAction::ExtendByteDown => self.extend_byte_down(max_contents_index),
CursorAction::ExtendByteLeft => self.extend_byte_left(),
CursorAction::ExtendByteRight => self.extend_byte_right(max_contents_index),
CursorAction::GotoLineStart => self.goto_line_start(),
CursorAction::GotoLineEnd => self.goto_line_end(max_contents_index),
CursorAction::GotoFileStart => self.goto_file_start(),
CursorAction::GotoFileEnd => self.goto_file_end(max_contents_index),
CursorAction::MoveNextWordStart => self.move_next_word_start(max_contents_index),
CursorAction::MoveNextWordEnd => self.move_next_word_end(max_contents_index),
CursorAction::MovePreviousWordStart => self.move_previous_word_start(),
CursorAction::ExtendNextWordStart => self.extend_next_word_start(max_contents_index),
CursorAction::ExtendNextWordEnd => self.extend_next_word_end(max_contents_index),
CursorAction::ExtendPreviousWordStart => self.extend_previous_word_start(),
CursorAction::ExtendLineBelow => self.extend_line_below(max_contents_index),
CursorAction::ExtendLineAbove => self.extend_line_above(max_contents_index),
}
}
pub const fn move_byte_up(&mut self) {
if self.head >= BYTES_PER_LINE {
self.head -= BYTES_PER_LINE;
self.collapse();
}
}
pub const fn move_byte_down(&mut self, max: usize) {
if max - self.head >= BYTES_PER_LINE {
self.head += BYTES_PER_LINE;
self.collapse();
}
}
pub const fn move_byte_left(&mut self) {
if self.head >= 1 {
self.head -= 1;
self.collapse();
}
}
pub const fn move_byte_right(&mut self, max: usize) {
if max - self.head >= 1 {
self.head += 1;
self.collapse();
}
}
pub const fn extend_byte_up(&mut self) {
if self.head >= BYTES_PER_LINE {
self.head -= BYTES_PER_LINE;
}
}
pub const fn extend_byte_down(&mut self, max: usize) {
if max - self.head >= BYTES_PER_LINE {
self.head += BYTES_PER_LINE;
}
}
pub const fn extend_byte_left(&mut self) {
if self.head >= 1 {
self.head -= 1;
}
}
pub const fn extend_byte_right(&mut self, max: usize) {
if max - self.head >= 1 {
self.head += 1;
}
}
pub const fn goto_line_start(&mut self) {
self.head -= self.head % BYTES_PER_LINE;
self.collapse();
}
pub fn goto_line_end(&mut self, max: usize) {
self.head = min(
self.head + BYTES_PER_LINE - 1 - (self.head % BYTES_PER_LINE),
max
);
self.collapse();
}
pub const fn goto_file_start(&mut self) {
self.head %= BYTES_PER_LINE;
self.collapse();
}
pub const fn goto_file_end(&mut self, max: usize) {
self.head += previous_multiple_of(BYTES_PER_LINE, max + 1 - self.head);
self.collapse();
}
pub fn move_next_word_start(&mut self, max: usize) {
if self.head == max { return; }
if self.head.is_multiple_of(4) { // at the beginning of a word
self.head = (self.head + 4).min(max);
} else {
self.head = self.head.next_multiple_of(4).min(max);
}
self.collapse();
}
pub fn move_next_word_end(&mut self, max: usize) {
if self.head == max { return; }
self.collapse();
if self.head % 4 == 3 { // at the end of a word
self.tail = self.head + 1;
self.head = (self.head + 4).min(max);
} else {
self.head = ((self.head + 1).next_multiple_of(4) - 1).min(max);
}
}
pub const fn move_previous_word_start(&mut self) {
if self.head == 0 { return; }
self.collapse();
if self.head.is_multiple_of(4) { // at the beginning of a word
self.tail = self.head - 1;
self.head -= 4;
} else {
self.head -= self.head % 4;
}
}
pub fn extend_next_word_start(&mut self, max: usize) {
if self.head == max { return; }
if self.head.is_multiple_of(4) { // at the beginning of a word
self.head = (self.head + 4).min(max);
} else {
self.head = self.head.next_multiple_of(4).min(max);
}
}
pub fn extend_next_word_end(&mut self, max: usize) {
if self.head == max { return; }
if self.head % 4 == 3 { // at the end of a word
self.head = (self.head + 4).min(max);
} else {
self.head = ((self.head + 1).next_multiple_of(4) - 1).min(max);
}
}
pub const fn extend_previous_word_start(&mut self) {
if self.head == 0 { return; }
if self.head.is_multiple_of(4) { // at the beginning of a word
self.head -= 4;
} else {
self.head -= self.head % 4;
}
}
pub fn extend_line_below(&mut self, max: usize) {
if self.tail > self.head {
swap(&mut self.head, &mut self.tail);
}
if self.tail.is_multiple_of(BYTES_PER_LINE) &&
self.head % BYTES_PER_LINE == BYTES_PER_LINE - 1
{
self.head = min(self.head + BYTES_PER_LINE, max);
} else {
self.tail -= self.tail % BYTES_PER_LINE;
self.head = min(
self.head + BYTES_PER_LINE - 1 - (self.head % BYTES_PER_LINE),
max
);
}
}
pub fn extend_line_above(&mut self, max: usize) {
if self.head > self.tail {
swap(&mut self.head, &mut self.tail);
}
if self.head.is_multiple_of(BYTES_PER_LINE) &&
(self.tail % BYTES_PER_LINE == BYTES_PER_LINE - 1 ||
self.tail == max)
{
self.head = self.head.saturating_sub(BYTES_PER_LINE);
} else {
self.head -= self.head % BYTES_PER_LINE;
self.tail = min(
self.tail + BYTES_PER_LINE - 1 - (self.tail % BYTES_PER_LINE),
max
);
}
}
}
const fn previous_multiple_of(multiple: usize, number: usize) -> usize {
if number == 0 {
0
} else {
(number - 1) - ((number - 1) % multiple)
}
}
mod tests {
#[allow(unused_imports)]
use crate::cursor::Cursor;
#[test]
fn next_word() {
// [a]bcd efgh -> abcd [e]fgh
let mut cursor = Cursor::at(0);
cursor.move_next_word_start(99);
assert_eq!(cursor, Cursor::at(4));
// a[b]cd efgh -> abcd [e]fgh
let mut cursor = Cursor::at(1);
cursor.move_next_word_start(99);
assert_eq!(cursor, Cursor::at(4));
// ab[c]d efgh -> abcd [e]fgh
let mut cursor = Cursor::at(2);
cursor.move_next_word_start(99);
assert_eq!(cursor, Cursor::at(4));
// abc[d] efgh -> abcd [e]fgh
let mut cursor = Cursor::at(3);
cursor.move_next_word_start(99);
assert_eq!(cursor, Cursor::at(4));
// [a]bcd -> abc[d]
let mut cursor = Cursor::at(0);
cursor.move_next_word_start(3);
assert_eq!(cursor, Cursor::at(3));
// [a]bc -> ab[c]
let mut cursor = Cursor::at(0);
cursor.move_next_word_start(2);
assert_eq!(cursor, Cursor::at(2));
// [a]b -> a[b]
let mut cursor = Cursor::at(0);
cursor.move_next_word_start(1);
assert_eq!(cursor, Cursor::at(1));
// [a] -> [a]
let mut cursor = Cursor::at(0);
cursor.move_next_word_start(0);
assert_eq!(cursor, Cursor::at(0));
// ab[c]d -> abc[d]
let mut cursor = Cursor::at(2);
cursor.move_next_word_start(3);
assert_eq!(cursor, Cursor::at(3));
// abc[d] -> abc[d]
let mut cursor = Cursor::at(3);
cursor.move_next_word_start(3);
assert_eq!(cursor, Cursor::at(3));
// ab[c[d] -> ab[c[d]
let mut cursor = Cursor { tail: 2, head: 3 };
cursor.move_next_word_start(3);
assert_eq!(cursor, Cursor { tail: 2, head: 3 });
}
#[test]
fn next_end() {
// [a]bcd -> [abcd]
let mut cursor = Cursor::at(0);
cursor.move_next_word_end(99);
assert_eq!(cursor, Cursor { tail: 0, head: 3 });
// a[b]cd -> [abcd]
let mut cursor = Cursor::at(1);
cursor.move_next_word_end(99);
assert_eq!(cursor, Cursor { tail: 1, head: 3 });
// ab[c]d -> [abcd]
let mut cursor = Cursor::at(2);
cursor.move_next_word_end(99);
assert_eq!(cursor, Cursor { tail: 2, head: 3 });
// abc[d] efgh -> abcd [efgh]
let mut cursor = Cursor::at(3);
cursor.move_next_word_end(99);
assert_eq!(cursor, Cursor { tail: 4, head: 7 });
// abcd [e]fgh -> abcd [efgh]
let mut cursor = Cursor::at(4);
cursor.move_next_word_end(99);
assert_eq!(cursor, Cursor { tail: 4, head: 7 });
// abcd e[f]gh -> abcd e[fgh]
let mut cursor = Cursor::at(5);
cursor.move_next_word_end(99);
assert_eq!(cursor, Cursor { tail: 5, head: 7 });
// abcd ef[g]h -> abcd ef[gh]
let mut cursor = Cursor::at(6);
cursor.move_next_word_end(99);
assert_eq!(cursor, Cursor { tail: 6, head: 7 });
// abcd efg[h] ijkl -> abcd efgh [ijkl]
let mut cursor = Cursor::at(7);
cursor.move_next_word_end(99);
assert_eq!(cursor, Cursor { tail: 8, head: 11 });
// abcd efg[h] -> abcd efg[h]
let mut cursor = Cursor::at(7);
cursor.move_next_word_end(7);
assert_eq!(cursor, Cursor { tail: 7, head: 7 });
// abcd e[fgh] -> abcd e[fgh]
let mut cursor = Cursor { tail: 5, head: 7 };
cursor.move_next_word_end(7);
assert_eq!(cursor, Cursor { tail: 5, head: 7 });
// a[b]c -> a[bc]
let mut cursor = Cursor::at(1);
cursor.move_next_word_end(2);
assert_eq!(cursor, Cursor { tail: 1, head: 2 });
// a[bc] -> a[bc]
let mut cursor = Cursor { tail: 1, head: 2};
cursor.move_next_word_end(2);
assert_eq!(cursor, Cursor { tail: 1, head: 2 });
// a[b] -> a[b]
let mut cursor = Cursor::at(1);
cursor.move_next_word_end(1);
assert_eq!(cursor, Cursor::at(1));
// [a]b -> [ab]
let mut cursor = Cursor::at(0);
cursor.move_next_word_end(1);
assert_eq!(cursor, Cursor { tail: 0, head: 1 });
// [ab] -> [ab]
let mut cursor = Cursor { tail: 0, head: 1};
cursor.move_next_word_end(1);
assert_eq!(cursor, Cursor { tail: 0, head: 1 });
// [a] -> [a]
let mut cursor = Cursor::at(0);
cursor.move_next_word_end(0);
assert_eq!(cursor, Cursor::at(0));
// [a]bcd] -> [abc[d]
let mut cursor = Cursor { head: 0, tail: 3 };
cursor.move_next_word_end(99);
assert_eq!(cursor, Cursor { tail: 0, head: 3 });
// [a[b]cd -> a[bc[d]
let mut cursor = Cursor { tail: 0, head: 1 };
cursor.move_next_word_end(99);
assert_eq!(cursor, Cursor { tail: 1, head: 3 });
// abc[d] ef -> abcd [ef]
let mut cursor = Cursor::at(3);
cursor.move_next_word_end(5);
assert_eq!(cursor, Cursor { tail: 4, head: 5 });
}
#[test]
fn previous_beginning() {
// abcd efgh [i]jkl -> abcd [efgh] ijkl
let mut cursor = Cursor::at(8);
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 4, tail: 7 });
// abcd efg[h] -> abcd [efgh]
let mut cursor = Cursor::at(7);
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 4, tail: 7 });
// abcd ef[g]h -> abcd [efg]h
let mut cursor = Cursor::at(6);
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 4, tail: 6 });
// abcd e[f]gh -> abcd [ef]gh
let mut cursor = Cursor::at(5);
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 4, tail: 5 });
// abcd [e]fgh -> [abcd] efgh
let mut cursor = Cursor::at(4);
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 0, tail: 3 });
// abc[d] -> [abcd]
let mut cursor = Cursor::at(3);
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 0, tail: 3 });
// ab[c]d -> [abc]d
let mut cursor = Cursor::at(2);
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 0, tail: 2 });
// a[b]cd -> [ab]cd
let mut cursor = Cursor::at(1);
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 0, tail: 1 });
// [a]bcd -> [a]bcd
let mut cursor = Cursor::at(0);
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 0, tail: 0 });
// [abc[d] -> [a]bcd]
let mut cursor = Cursor { tail: 0, head: 3 };
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 0, tail: 3 });
// ab[c]d] -> [a]bc]d
let mut cursor = Cursor { head: 2, tail: 3 };
cursor.move_previous_word_start();
assert_eq!(cursor, Cursor { head: 0, tail: 2 });
}
}