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use super::*;
impl Line {
/// Adds additional text to the `Line`, respecting a subset of ANSI escape
/// sequences in the process.
///
/// We support only CSI SGR codes (escape followed by `[` ending with `m`).
/// All unsupported codes are passed through unchanged.
pub fn add_ansi_text<'a, T>(&mut self, input_line: T) -> &mut Line
where
T: Into<Cow<'a, str>>,
{
let input_line = input_line.into();
let mut unescaped_start = 0;
'outer: while unescaped_start < input_line.len() {
let mut char_indices =
input_line[unescaped_start..].char_indices();
loop {
let Some((sequence_start, ch)) = char_indices.next() else {
break;
};
if ch != '\x1B' {
continue;
}
let Some((_, ch)) = char_indices.next() else {
break;
};
if ch != '[' {
continue;
}
if sequence_start != 0 {
self.add_text(
&input_line[unescaped_start
..unescaped_start + sequence_start],
);
}
// in case of a parse error
unescaped_start += sequence_start + 2;
let csi_bytes = input_line[unescaped_start..].as_bytes();
let mut i = 0;
// a CSI command starts with zero or more "parameter bytes"
let param_start = i;
while i < csi_bytes.len()
&& (0x30..=0x3F).contains(&csi_bytes[i])
{
i += 1;
}
let param_end = i;
// followed by zero or more "intermediate bytes"
let intermediate_start = i;
while i < csi_bytes.len()
&& (0x30..=0x3F).contains(&csi_bytes[i])
{
i += 1;
}
let intermediate_end = i;
// followed by one "final byte"
if csi_bytes.get(i).copied() != Some(b'm')
|| intermediate_start != intermediate_end
{
// not an SGR code, or not a valid CSI code
self.add_text("\x1B[");
continue 'outer;
};
// now, let the graphic renditions begin!
let mut codes = input_line[unescaped_start + param_start
..unescaped_start + param_end]
.split(';')
.map(|code| code.parse::<u32>().unwrap_or(0));
while let Some(code) = codes.next() {
match code {
0 => drop(self.reset_all()),
1 => drop(self.activate_style(Style::BOLD)),
2 => drop(self.activate_style(Style::DIM)),
3 => drop(self.activate_style(Style::ITALIC)),
4 => drop(self.activate_style(Style::UNDERLINE)),
7 => drop(self.activate_style(Style::REVERSE)),
21 => drop(self.deactivate_style(Style::BOLD)),
22 => drop(
self.deactivate_style(Style::BOLD | Style::DIM),
),
23 => drop(self.deactivate_style(Style::ITALIC)),
24 => drop(self.deactivate_style(Style::UNDERLINE)),
27 => drop(self.deactivate_style(Style::REVERSE)),
30 => drop(self.set_fg_color(Some(Color::Black))),
31 => drop(self.set_fg_color(Some(Color::Red))),
32 => drop(self.set_fg_color(Some(Color::Green))),
33 => drop(self.set_fg_color(Some(Color::Yellow))),
34 => drop(self.set_fg_color(Some(Color::Blue))),
35 => drop(self.set_fg_color(Some(Color::Magenta))),
36 => drop(self.set_fg_color(Some(Color::Cyan))),
37 => drop(self.set_fg_color(Some(Color::White))),
39 => drop(self.set_fg_color(None)),
40 => drop(self.set_bg_color(Some(Color::Black))),
41 => drop(self.set_bg_color(Some(Color::Red))),
42 => drop(self.set_bg_color(Some(Color::Green))),
43 => drop(self.set_bg_color(Some(Color::Yellow))),
44 => drop(self.set_bg_color(Some(Color::Blue))),
45 => drop(self.set_bg_color(Some(Color::Magenta))),
46 => drop(self.set_bg_color(Some(Color::Cyan))),
47 => drop(self.set_bg_color(Some(Color::White))),
49 => drop(self.set_bg_color(None)),
38 | 48 | 58 => {
match codes.next() {
Some(5) => {
// 8-bit color, not supported
let _index = codes.next();
}
Some(2) => {
// RGB color, not supported
let _r = codes.next();
let _g = codes.next();
let _b = codes.next();
}
_ => (),
}
}
// IGNORE all unknown SGR codes
_ => (),
};
}
// when we resume parsing text, it will be after this SGR code
unescaped_start += i + 1;
continue 'outer;
}
self.add_text(&input_line[unescaped_start..]);
break;
}
self
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn basic_ansi_test() {
let mut line = Line::new();
line.add_ansi_text("Hello \x1B[1;32mWorld\x1B[21m!\x1B[0m Yay!");
assert_eq!(
line,
liso!("Hello ", +bold, fg=green, "World", -bold, "!", reset, " Yay!")
);
assert_eq!(
liso!(ansi "Hello \x1B[1;32mWorld\x1B[21m!\x1B[0m Yay!"),
liso!("Hello ", +bold, fg=green, "World", -bold, "!", reset, " Yay!")
);
}
}