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use crate::graphemes::{nth_next_grapheme_boundary, nth_prev_grapheme_boundary, RopeGraphemes};
use crate::{coords_at_pos, pos_at_coords, ChangeSet, Position, Range, Rope, RopeSlice, Selection};
pub fn move_next_word_start(slice: RopeSlice, mut pos: usize, count: usize) -> usize {
for _ in 0..count {
if pos + 1 == slice.len_chars() {
return pos;
}
let mut ch = slice.char(pos);
let next = slice.char(pos + 1);
// if we're at the end of a word, or on whitespce right before new one
if categorize(ch) != categorize(next) {
pos += 1;
ch = next;
}
if is_word(ch) {
skip_over_next(slice, &mut pos, is_word);
} else if ch.is_ascii_punctuation() {
skip_over_next(slice, &mut pos, |ch| ch.is_ascii_punctuation());
}
// TODO: don't include newline?
skip_over_next(slice, &mut pos, |ch| ch.is_ascii_whitespace());
}
pos
}
pub fn move_prev_word_start(slice: RopeSlice, mut pos: usize, count: usize) -> usize {
for _ in 0..count {
if pos == 0 {
return pos;
}
let ch = slice.char(pos);
let prev = slice.char(pos - 1);
if categorize(ch) != categorize(prev) {
pos -= 1;
}
// match (category c1, category c2) => {
// if c1 != c2 {
// }
// }
// TODO: skip while eol
// TODO: don't include newline?
skip_over_prev(slice, &mut pos, |ch| ch.is_ascii_whitespace());
// refetch
let ch = slice.char(pos);
if is_word(ch) {
skip_over_prev(slice, &mut pos, is_word);
} else if ch.is_ascii_punctuation() {
skip_over_prev(slice, &mut pos, |ch| ch.is_ascii_punctuation());
}
pos = pos.saturating_add(1)
}
pos
}
pub fn move_next_word_end(slice: RopeSlice, mut pos: usize, count: usize) -> usize {
for _ in 0..count {
if pos + 1 == slice.len_chars() {
return pos;
}
let ch = slice.char(pos);
let next = slice.char(pos + 1);
if categorize(ch) != categorize(next) {
pos += 1;
}
// TODO: don't include newline?
skip_over_next(slice, &mut pos, |ch| ch.is_ascii_whitespace());
// refetch
let ch = slice.char(pos);
if is_word(ch) {
skip_over_next(slice, &mut pos, is_word);
} else if ch.is_ascii_punctuation() {
skip_over_next(slice, &mut pos, |ch| ch.is_ascii_punctuation());
}
pos -= 1
}
pos
}
// ---- util ------------
// used for by-word movement
fn is_word(ch: char) -> bool {
ch.is_alphanumeric() || ch == '_'
}
#[derive(Debug, Eq, PartialEq)]
enum Category {
Whitespace,
Eol,
Word,
Punctuation,
}
fn categorize(ch: char) -> Category {
if ch == '\n' {
Category::Eol
} else if ch.is_ascii_whitespace() {
Category::Whitespace
} else if ch.is_ascii_punctuation() {
Category::Punctuation
} else if ch.is_ascii_alphanumeric() {
Category::Word
} else {
unreachable!()
}
}
#[inline]
pub fn skip_over_next<F>(slice: RopeSlice, pos: &mut usize, fun: F)
where
F: Fn(char) -> bool,
{
let mut chars = slice.chars_at(*pos);
for ch in chars {
if !fun(ch) {
break;
}
*pos += 1;
}
}
#[inline]
pub fn skip_over_prev<F>(slice: RopeSlice, pos: &mut usize, fun: F)
where
F: Fn(char) -> bool,
{
// need to +1 so that prev() includes current char
let mut chars = slice.chars_at(*pos + 1);
while let Some(ch) = chars.prev() {
if !fun(ch) {
break;
}
*pos = pos.saturating_sub(1);
}
}
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