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|
use bitflags::bitflags;
use serde::{Deserialize, Serialize};
use crate::ansi::{Color, NamedColor};
use crate::grid::{self, GridCell};
use crate::index::Column;
/// Maximum number of zerowidth characters which will be stored per cell.
pub const MAX_ZEROWIDTH_CHARS: usize = 5;
bitflags! {
#[derive(Serialize, Deserialize)]
pub struct Flags: u16 {
const INVERSE = 0b00_0000_0001;
const BOLD = 0b00_0000_0010;
const ITALIC = 0b00_0000_0100;
const BOLD_ITALIC = 0b00_0000_0110;
const UNDERLINE = 0b00_0000_1000;
const WRAPLINE = 0b00_0001_0000;
const WIDE_CHAR = 0b00_0010_0000;
const WIDE_CHAR_SPACER = 0b00_0100_0000;
const DIM = 0b00_1000_0000;
const DIM_BOLD = 0b00_1000_0010;
const HIDDEN = 0b01_0000_0000;
const STRIKEOUT = 0b10_0000_0000;
}
}
const fn default_extra() -> [char; MAX_ZEROWIDTH_CHARS] {
[' '; MAX_ZEROWIDTH_CHARS]
}
#[derive(Copy, Clone, Debug, Serialize, Deserialize, Eq, PartialEq)]
pub struct Cell {
pub c: char,
pub fg: Color,
pub bg: Color,
pub flags: Flags,
#[serde(default = "default_extra")]
pub extra: [char; MAX_ZEROWIDTH_CHARS],
}
impl Default for Cell {
fn default() -> Cell {
Cell::new(' ', Color::Named(NamedColor::Foreground), Color::Named(NamedColor::Background))
}
}
impl GridCell for Cell {
#[inline]
fn is_empty(&self) -> bool {
(self.c == ' ' || self.c == '\t')
&& self.extra[0] == ' '
&& self.bg == Color::Named(NamedColor::Background)
&& self.fg == Color::Named(NamedColor::Foreground)
&& !self.flags.intersects(
Flags::INVERSE
| Flags::UNDERLINE
| Flags::STRIKEOUT
| Flags::WRAPLINE
| Flags::WIDE_CHAR_SPACER,
)
}
#[inline]
fn flags(&self) -> &Flags {
&self.flags
}
#[inline]
fn flags_mut(&mut self) -> &mut Flags {
&mut self.flags
}
#[inline]
fn fast_eq(&self, other: Self) -> bool {
self.bg == other.bg
}
}
/// Get the length of occupied cells in a line.
pub trait LineLength {
/// Calculate the occupied line length.
fn line_length(&self) -> Column;
}
impl LineLength for grid::Row<Cell> {
fn line_length(&self) -> Column {
let mut length = Column(0);
if self[Column(self.len() - 1)].flags.contains(Flags::WRAPLINE) {
return Column(self.len());
}
for (index, cell) in self[..].iter().rev().enumerate() {
if cell.c != ' ' || cell.extra[0] != ' ' {
length = Column(self.len() - index);
break;
}
}
length
}
}
impl Cell {
#[inline]
pub fn bold(&self) -> bool {
self.flags.contains(Flags::BOLD)
}
#[inline]
pub fn inverse(&self) -> bool {
self.flags.contains(Flags::INVERSE)
}
#[inline]
pub fn dim(&self) -> bool {
self.flags.contains(Flags::DIM)
}
pub fn new(c: char, fg: Color, bg: Color) -> Cell {
Cell { extra: [' '; MAX_ZEROWIDTH_CHARS], c, bg, fg, flags: Flags::empty() }
}
#[inline]
pub fn reset(&mut self, template: &Cell) {
// memcpy template to self.
*self = Cell { c: template.c, bg: template.bg, ..Cell::default() };
}
#[inline]
pub fn chars(&self) -> [char; MAX_ZEROWIDTH_CHARS + 1] {
unsafe {
let mut chars = [std::mem::MaybeUninit::uninit(); MAX_ZEROWIDTH_CHARS + 1];
std::ptr::write(chars[0].as_mut_ptr(), self.c);
std::ptr::copy_nonoverlapping(
self.extra.as_ptr() as *mut std::mem::MaybeUninit<char>,
chars.as_mut_ptr().offset(1),
self.extra.len(),
);
std::mem::transmute(chars)
}
}
#[inline]
pub fn push_extra(&mut self, c: char) {
for elem in self.extra.iter_mut() {
if elem == &' ' {
*elem = c;
break;
}
}
}
}
#[cfg(test)]
mod tests {
use super::{Cell, LineLength};
use crate::grid::Row;
use crate::index::Column;
#[test]
fn line_length_works() {
let template = Cell::default();
let mut row = Row::new(Column(10), template);
row[Column(5)].c = 'a';
assert_eq!(row.line_length(), Column(6));
}
#[test]
fn line_length_works_with_wrapline() {
let template = Cell::default();
let mut row = Row::new(Column(10), template);
row[Column(9)].flags.insert(super::Flags::WRAPLINE);
assert_eq!(row.line_length(), Column(10));
}
}
#[cfg(all(test, feature = "bench"))]
mod benches {
extern crate test;
use super::Cell;
#[bench]
fn cell_reset(b: &mut test::Bencher) {
b.iter(|| {
let mut cell = Cell::default();
for _ in 0..100 {
cell.reset(test::black_box(&Cell::default()));
}
test::black_box(cell);
});
}
}
|
