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|
use zellij_utils::pane_size::SizeInPixels;
use zellij_utils::{ipc::PixelDimensions, lazy_static::lazy_static, regex::Regex};
use zellij_tile::data::{CharOrArrow, Key};
pub struct StdinAnsiParser {
expected_ansi_instructions: usize,
current_buffer: Vec<(Key, Vec<u8>)>,
}
impl StdinAnsiParser {
pub fn new() -> Self {
StdinAnsiParser {
expected_ansi_instructions: 0,
current_buffer: vec![],
}
}
pub fn increment_expected_ansi_instructions(&mut self, to: usize) {
self.expected_ansi_instructions += to;
}
pub fn decrement_expected_ansi_instructions(&mut self, by: usize) {
self.expected_ansi_instructions = self.expected_ansi_instructions.saturating_sub(by);
}
pub fn expected_instructions(&self) -> usize {
self.expected_ansi_instructions
}
pub fn parse(&mut self, key: Key, raw_bytes: Vec<u8>) -> Option<AnsiStdinInstructionOrKeys> {
if self.current_buffer.is_empty()
&& (key != Key::Esc && key != Key::Alt(CharOrArrow::Char(']')))
{
// the first key of a sequence is always Esc, but termwiz interprets esc + ] as Alt+]
self.current_buffer.push((key, raw_bytes));
self.expected_ansi_instructions = 0;
return Some(AnsiStdinInstructionOrKeys::Keys(
self.current_buffer.drain(..).collect(),
));
}
if let Key::Char('t') = key {
self.current_buffer.push((key, raw_bytes));
match AnsiStdinInstructionOrKeys::pixel_dimensions_from_keys(&self.current_buffer) {
Ok(pixel_instruction) => {
self.decrement_expected_ansi_instructions(1);
self.current_buffer.clear();
Some(pixel_instruction)
}
Err(_) => {
self.expected_ansi_instructions = 0;
Some(AnsiStdinInstructionOrKeys::Keys(
self.current_buffer.drain(..).collect(),
))
}
}
} else if let Key::Alt(CharOrArrow::Char('\\')) | Key::Ctrl('g') = key {
match AnsiStdinInstructionOrKeys::color_sequence_from_keys(&self.current_buffer) {
Ok(color_instruction) => {
self.decrement_expected_ansi_instructions(1);
self.current_buffer.clear();
Some(color_instruction)
}
Err(_) => {
self.expected_ansi_instructions = 0;
Some(AnsiStdinInstructionOrKeys::Keys(
self.current_buffer.drain(..).collect(),
))
}
}
} else if self.key_is_valid(key) {
self.current_buffer.push((key, raw_bytes));
None
} else {
self.current_buffer.push((key, raw_bytes));
self.expected_ansi_instructions = 0;
Some(AnsiStdinInstructionOrKeys::Keys(
self.current_buffer.drain(..).collect(),
))
}
}
fn key_is_valid(&self, key: Key) -> bool {
match key {
Key::Esc => {
// this is a UX improvement
// in case the user's terminal doesn't support one or more of these signals,
// if they spam ESC they need to be able to get back to normal mode and not "us
// waiting for ansi instructions" mode
!self.current_buffer.iter().any(|(key, _)| *key == Key::Esc)
}
Key::Char(';')
| Key::Char('[')
| Key::Char(']')
| Key::Char('r')
| Key::Char('g')
| Key::Char('b')
| Key::Char('\\')
| Key::Char(':')
| Key::Char('/') => true,
Key::Alt(CharOrArrow::Char(']')) => true,
Key::Alt(CharOrArrow::Char('\\')) => true,
Key::Char(c) => {
if let '0'..='9' | 'a'..='f' = c {
true
} else {
false
}
}
_ => false,
}
}
}
#[derive(Debug)]
pub enum AnsiStdinInstructionOrKeys {
PixelDimensions(PixelDimensions),
BackgroundColor(String),
ForegroundColor(String),
Keys(Vec<(Key, Vec<u8>)>),
}
impl AnsiStdinInstructionOrKeys {
pub fn pixel_dimensions_from_keys(keys: &Vec<(Key, Vec<u8>)>) -> Result<Self, &'static str> {
lazy_static! {
static ref RE: Regex = Regex::new(r"^\u{1b}\[(\d+);(\d+);(\d+)t$").unwrap();
}
let key_sequence: Vec<Option<char>> = keys
.iter()
.map(|(key, _)| match key {
Key::Char(c) => Some(*c),
Key::Esc => Some('\u{1b}'),
_ => None,
})
.collect();
if key_sequence.iter().all(|k| k.is_some()) {
let key_string: String = key_sequence.iter().map(|k| k.unwrap()).collect();
let captures = RE
.captures_iter(&key_string)
.next()
.ok_or("invalid_instruction")?;
let csi_index = captures[1].parse::<usize>();
let first_field = captures[2].parse::<usize>();
let second_field = captures[3].parse::<usize>();
if csi_index.is_err() || first_field.is_err() || second_field.is_err() {
return Err("invalid_instruction");
}
match csi_index {
Ok(4) => {
// text area size
Ok(AnsiStdinInstructionOrKeys::PixelDimensions(
PixelDimensions {
character_cell_size: None,
text_area_size: Some(SizeInPixels {
height: first_field.unwrap(),
width: second_field.unwrap(),
}),
},
))
}
Ok(6) => {
// character cell size
Ok(AnsiStdinInstructionOrKeys::PixelDimensions(
PixelDimensions {
character_cell_size
|
