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201 lines
5.4 KiB
Rust
201 lines
5.4 KiB
Rust
use std::cmp::min;
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use std::usize;
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use unicode_segmentation::UnicodeSegmentation;
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use layout::Rect;
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use style::Color;
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#[derive(Debug, Clone, PartialEq)]
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pub struct Cell {
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pub fg: Color,
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pub bg: Color,
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pub symbol: String,
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}
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impl Cell {
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pub fn reset(&mut self) {
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self.symbol.clear();
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self.symbol.push(' ');
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self.fg = Color::Reset;
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self.bg = Color::Reset;
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}
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}
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impl Default for Cell {
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fn default() -> Cell {
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Cell {
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symbol: " ".into(),
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fg: Color::Reset,
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bg: Color::Reset,
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}
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}
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}
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#[derive(Debug, Clone)]
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pub struct Buffer {
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pub area: Rect,
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pub content: Vec<Cell>,
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}
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impl Default for Buffer {
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fn default() -> Buffer {
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Buffer {
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area: Default::default(),
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content: Vec::new(),
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}
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}
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}
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impl Buffer {
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pub fn empty(area: Rect) -> Buffer {
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let cell: Cell = Default::default();
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Buffer::filled(area, cell)
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}
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pub fn filled(area: Rect, cell: Cell) -> Buffer {
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let size = area.area() as usize;
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let mut content = Vec::with_capacity(size);
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for _ in 0..size {
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content.push(cell.clone());
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}
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Buffer {
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area: area,
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content: content,
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}
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}
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pub fn content(&self) -> &[Cell] {
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&self.content
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}
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pub fn area(&self) -> &Rect {
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&self.area
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}
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pub fn at(&self, x: u16, y: u16) -> &Cell {
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let i = self.index_of(x, y);
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&self.content[i]
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}
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pub fn index_of(&self, x: u16, y: u16) -> usize {
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let index = (y * self.area.width + x) as usize;
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debug_assert!(index < self.content.len());
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index
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}
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pub fn pos_of(&self, i: usize) -> (u16, u16) {
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debug_assert!(self.area.width > 0);
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(i as u16 % self.area.width, i as u16 / self.area.width)
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}
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pub fn set_symbol(&mut self, x: u16, y: u16, symbol: &str) {
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let i = self.index_of(x, y);
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self.content[i].symbol.clear();
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self.content[i].symbol.push_str(symbol);
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}
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pub fn set_fg(&mut self, x: u16, y: u16, color: Color) {
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let i = self.index_of(x, y);
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self.content[i].fg = color;
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}
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pub fn set_bg(&mut self, x: u16, y: u16, color: Color) {
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let i = self.index_of(x, y);
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self.content[i].bg = color;
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}
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pub fn set_string(&mut self, x: u16, y: u16, string: &str, fg: Color, bg: Color) {
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self.set_characters(x, y, string, usize::MAX, fg, bg);
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}
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pub fn set_characters(&mut self,
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x: u16,
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y: u16,
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string: &str,
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limit: usize,
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fg: Color,
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bg: Color) {
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let mut index = self.index_of(x, y);
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let graphemes = UnicodeSegmentation::graphemes(string, true).collect::<Vec<&str>>();
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let max_index = min((self.area.width - x) as usize, limit);
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for s in graphemes.into_iter().take(max_index) {
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self.content[index].symbol.clear();
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self.content[index].symbol.push_str(s);
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self.content[index].fg = fg;
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self.content[index].bg = bg;
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index += 1;
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}
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}
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pub fn set_colors(&mut self, x: u16, y: u16, fg: Color, bg: Color) {
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let i = self.index_of(x, y);
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self.content[i].fg = fg;
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self.content[i].bg = bg;
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}
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pub fn set_cell(&mut self, x: u16, y: u16, symbol: &str, fg: Color, bg: Color) {
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let i = self.index_of(x, y);
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self.content[i].symbol.clear();
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self.content[i].symbol.push_str(symbol);
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self.content[i].fg = fg;
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self.content[i].bg = bg;
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}
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pub fn update_cell<F>(&mut self, x: u16, y: u16, f: F)
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where F: Fn(&mut Cell)
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{
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let i = self.index_of(x, y);
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f(&mut self.content[i]);
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}
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pub fn resize(&mut self, area: Rect) {
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let length = area.area() as usize;
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if self.content.len() > length {
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self.content.truncate(length);
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} else {
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self.content.resize(length, Default::default());
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}
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self.area = area;
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}
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pub fn reset(&mut self) {
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for c in &mut self.content {
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c.reset();
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}
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}
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pub fn merge(&mut self, other: Buffer) {
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let area = self.area.union(&other.area);
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let cell: Cell = Default::default();
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self.content.resize(area.area() as usize, cell.clone());
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// Move original content to the appropriate space
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let offset_x = self.area.x - area.x;
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let offset_y = self.area.y - area.y;
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let size = self.area.area() as usize;
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for i in (0..size).rev() {
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let (x, y) = self.pos_of(i);
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// New index in content
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let k = ((y + offset_y) * area.width + (x + offset_x)) as usize;
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self.content[k] = self.content[i].clone();
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if i != k {
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self.content[i] = cell.clone();
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}
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}
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// Push content of the other buffer into this one (may erase previous
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// data)
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let offset_x = other.area.x - area.x;
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let offset_y = other.area.y - area.y;
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let size = other.area.area() as usize;
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for i in 0..size {
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let (x, y) = other.pos_of(i);
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// New index in content
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let k = ((y + offset_y) * area.width + (x + offset_x)) as usize;
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self.content[k] = other.content[i].clone();
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}
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self.area = area;
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}
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}
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