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use mlua::FromLuaMulti;
pub enum CursorMove {
Up(usize),
Down(usize),
Left(usize),
Right(usize),
Top,
Bottom,
Begin,
End,
Jump((usize, usize)),
Relative((isize, isize)),
}
impl<'lua> FromLuaMulti<'lua> for CursorMove {
fn from_lua_multi(
values: mlua::prelude::LuaMultiValue<'lua>,
_lua: &'lua mlua::prelude::Lua,
) -> mlua::prelude::LuaResult<Self> {
let first = values
.get(1)
.filter(|v| v.is_integer() || v.is_number())
.map(|v| {
if v.is_number() {
v.as_number().unwrap() as usize
} else {
v.as_integer().unwrap() as usize
}
});
let second = values
.get(2)
.filter(|v| v.is_integer() || v.is_number())
.map(|v| {
if v.is_number() {
v.as_number().unwrap() as usize
} else {
v.as_integer().unwrap() as usize
}
});
if let Some(value) = values.get(0) {
if value.is_string() {
match value.as_str().unwrap().to_lowercase().as_str() {
"up" => return Ok(CursorMove::Up(first.unwrap_or(1))),
"down" => return Ok(CursorMove::Down(first.unwrap_or(1))),
"left" => return Ok(CursorMove::Left(first.unwrap_or(1))),
"right" => return Ok(CursorMove::Right(first.unwrap_or(1))),
"top" => return Ok(CursorMove::Top),
"bottom" => return Ok(CursorMove::Bottom),
"begin" => return Ok(CursorMove::Begin),
"end" => return Ok(CursorMove::End),
"jump" => {
if let Some(first) = first {
if let Some(second) = second {
return Ok(CursorMove::Jump((first.max(0), second.max(0))));
}
}
return Err(mlua::Error::runtime("invalid row, column values"));
}
"relative" => {
if let Some(first) = first {
if let Some(second) = second {
return Ok(CursorMove::Relative((first as isize, second as isize)));
}
}
return Err(mlua::Error::runtime("invalid row, column values"));
}
_ => {}
}
}
}
Err(mlua::Error::runtime("invalid first value"))
}
}
#[derive(Default, Debug, Clone)]
pub struct Cursor {
x: isize,
y: isize,
x_max: isize,
y_max: isize,
}
impl Cursor {
pub const fn new() -> Self {
Self {
x: 0,
y: 0,
x_max: 0,
y_max: 0,
}
}
pub const fn with_position(mut self, x: isize, y: isize) -> Self {
self.x = x;
self.y = y;
self
}
pub const fn with_max(mut self, x: isize, y: isize) -> Self {
self.x_max = x;
self.y_max = y;
self
}
pub fn x(&self) -> usize {
self.x as usize
}
pub fn y(&self) -> usize {
self.y as usize
}
pub fn set_x_max(&mut self, max: usize) {
self.x_max = max as isize;
}
pub fn set_y_max(&mut self, max: usize) {
self.y_max = max as isize;
}
pub fn move_checked(&mut self, m: CursorMove) {
self.move_unchecked(m);
self.correct_cursor_position();
}
pub fn move_unchecked(&mut self, m: CursorMove) {
match m {
CursorMove::Up(n) => self.y -= n as isize,
CursorMove::Down(n) => self.y += n as isize,
CursorMove::Left(n) => self.x -= n as isize,
CursorMove::Right(n) => self.x += n as isize,
CursorMove::Top => self.y = 0,
CursorMove::Bottom => self.y = self.y_max,
CursorMove::Begin => self.x = 0,
CursorMove::End => self.x = self.x_max,
CursorMove::Jump((x, y)) => {
self.x = x as isize;
self.y = y as isize;
}
CursorMove::Relative((x, y)) => {
self.x += x;
self.y += y;
}
};
}
pub fn correct_cursor_position(&mut self) {
self.y = self.y.max(0).min(self.y_max);
self.x = self.x.max(0).min(self.x_max);
}
pub fn is_at_start(&self) -> bool {
self.x == 0
}
pub fn is_at_end(&self) -> bool {
self.x == self.x_max
}
pub fn is_at_top(&self) -> bool {
self.y == 0
}
pub fn is_at_bottom(&self) -> bool {
self.y == self.y_max
}
}
|
