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use crate::color::{self, Color};
/// Text rendering attributes for a terminal cell.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub struct Style {
pub bold: bool,
pub faint: bool,
pub italic: bool,
pub underline: bool,
pub blink: bool,
pub inverse: bool,
pub strikethrough: bool,
pub fg: Option<Color>,
pub bg: Option<Color>,
}
impl Default for Style {
fn default() -> Self {
Self {
bold: false,
faint: false,
italic: false,
underline: false,
blink: false,
inverse: false,
strikethrough: false,
fg: None,
bg: None,
}
}
}
impl Style {
/// Apply SGR (Select Graphic Rendition) parameters to this style.
pub(crate) fn apply_sgr(&mut self, params: &[Option<usize>]) {
if params.is_empty() {
*self = Self::default();
return;
}
let mut i = 0;
while i < params.len() {
let code = match params[i] {
Some(v) => v,
None => {
// Missing parameter treats as 0 (reset).
*self = Self::default();
i += 1;
continue;
}
};
match code {
0 => *self = Self::default(),
1 => self.bold = true,
2 => self.faint = true,
3 => self.italic = true,
4 => self.underline = true,
5 | 6 => self.blink = true,
7 => self.inverse = true,
9 => self.strikethrough = true,
22 => {
self.bold = false;
self.faint = false;
}
23 => self.italic = false,
24 => self.underline = false,
25 => self.blink = false,
27 => self.inverse = false,
29 => self.strikethrough = false,
30..=37 | 90..=97 => {
self.fg = color::ansi_fg(code).map(Color::Ansi);
}
39 => self.fg = None,
40..=47 | 100..=107 => {
self.bg = color::ansi_bg(code).map(Color::Ansi);
}
49 => self.bg = None,
38 => {
// Extended foreground: 38;5;N or 38;2;R;G;B
if let Some(type_param) = params.get(i + 1).and_then(|p| *p) {
match type_param {
5 => {
if let Some(c) =
Color::from_sgr_params(5, params.get(i + 2..).unwrap_or(&[]))
{
self.fg = Some(c);
}
i += 3;
continue;
}
2 => {
if let Some(c) =
Color::from_sgr_params(2, params.get(i + 2..).unwrap_or(&[]))
{
self.fg = Some(c);
}
i += 5;
continue;
}
_ => {}
}
}
}
48 => {
// Extended background: 48;5;N or 48;2;R;G;B
if let Some(type_param) = params.get(i + 1).and_then(|p| *p) {
match type_param {
5 => {
if let Some(c) =
Color::from_sgr_params(5, params.get(i + 2..).unwrap_or(&[]))
{
self.bg = Some(c);
}
i += 3;
continue;
}
2 => {
if let Some(c) =
Color::from_sgr_params(2, params.get(i + 2..).unwrap_or(&[]))
{
self.bg = Some(c);
}
i += 5;
continue;
}
_ => {}
}
}
}
_ => {}
}
i += 1;
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::color::{AnsiColor, Color};
#[test]
fn sgr_reset() {
let mut style = Style {
bold: true,
fg: Some(Color::Ansi(AnsiColor::Red)),
..Style::default()
};
style.apply_sgr(&[Some(0)]);
assert_eq!(style, Style::default());
}
#[test]
fn sgr_bold_and_color() {
let mut style = Style::default();
style.apply_sgr(&[Some(1), Some(31)]);
assert!(style.bold);
assert_eq!(style.fg, Some(Color::Ansi(AnsiColor::Red)));
}
#[test]
fn sgr_256_color() {
let mut style = Style::default();
style.apply_sgr(&[Some(38), Some(5), Some(196)]);
assert_eq!(style.fg, Some(Color::Indexed(196)));
}
#[test]
fn sgr_rgb_color() {
let mut style = Style::default();
style.apply_sgr(&[Some(38), Some(2), Some(255), Some(128), Some(0)]);
assert_eq!(
style.fg,
Some(Color::Rgb {
r: 255,
g: 128,
b: 0
})
);
}
#[test]
fn sgr_individual_resets() {
let mut style = Style {
bold: true,
italic: true,
underline: true,
..Style::default()
};
style.apply_sgr(&[Some(22), Some(23)]);
assert!(!style.bold);
assert!(!style.faint);
assert!(!style.italic);
assert!(style.underline);
}
}