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use std::fmt::{Display, Formatter};
// Wrapper to avoid unnecessary branching when input doesn't have ANSI escape sequences.
pub struct AnsiStyle {
attributes: Option<Attributes>,
}
impl AnsiStyle {
pub fn new() -> Self {
AnsiStyle { attributes: None }
}
pub fn update(&mut self, sequence: &str) -> bool {
match &mut self.attributes {
Some(a) => a.update(sequence),
None => {
self.attributes = Some(Attributes::new());
self.attributes.as_mut().unwrap().update(sequence)
}
}
}
}
impl Display for AnsiStyle {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
match self.attributes {
Some(ref a) => a.fmt(f),
None => Ok(()),
}
}
}
struct Attributes {
foreground: String,
background: String,
underlined: String,
/// The character set to use.
/// REGEX: `\^[()][AB0-3]`
charset: String,
/// A buffer for unknown sequences.
unknown_buffer: String,
/// ON: ^[1m
/// OFF: ^[22m
bold: String,
/// ON: ^[2m
/// OFF: ^[22m
dim: String,
/// ON: ^[4m
/// OFF: ^[24m
underline: String,
/// ON: ^[3m
/// OFF: ^[23m
italic: String,
/// ON: ^[9m
/// OFF: ^[29m
strike: String,
}
impl Attributes {
pub fn new() -> Self {
Attributes {
foreground: "".to_owned(),
background: "".to_owned(),
underlined: "".to_owned(),
charset: "".to_owned(),
unknown_buffer: "".to_owned(),
bold: "".to_owned(),
dim: "".to_owned(),
underline: "".to_owned(),
italic: "".to_owned(),
strike: "".to_owned(),
}
}
/// Update the attributes with an escape sequence.
/// Returns `false` if the sequence is unsupported.
pub fn update(&mut self, sequence: &str) -> bool {
let mut chars = sequence.char_indices().skip(1);
if let Some((_, t)) = chars.next() {
match t {
'(' => self.update_with_charset('(', chars.map(|(_, c)| c)),
')' => self.update_with_charset(')', chars.map(|(_, c)| c)),
'[' => {
if let Some((i, last)) = chars.last() {
// SAFETY: Always starts with ^[ and ends with m.
self.update_with_csi(last, &sequence[2..i])
} else {
false
}
}
_ => self.update_with_unsupported(sequence),
}
} else {
false
}
}
fn sgr_reset(&mut self) {
self.foreground.clear();
self.background.clear();
self.underlined.clear();
self.bold.clear();
self.dim.clear();
self.underline.clear();
self.italic.clear();
self.strike.clear();
}
fn update_with_sgr(&mut self, parameters: &str) -> bool {
let mut iter = parameters
.split(';')
.map(|p| if p.is_empty() { "0" } else { p })
.map(|p| p.parse::<u16>())
.map(|p| p.unwrap_or(0)); // Treat errors as 0.
while let Some(p) = iter.next() {
match p {
0 => self.sgr_reset(),
1 => self.bold = format!("\x1B[{}m", parameters),
2 => self.dim = format!("\x1B[{}m", parameters),
3 => self.italic = format!("\x1B[{}m", parameters),
4 => self.underline = format!("\x1B[{}m", parameters),
23 => self.italic.clear(),
24 => self.underline.clear(),
22 => {
self.bold.clear();
self.dim.clear();
}
30..=39 => self.foreground = Self::parse_color(p, &mut iter),
40..=49 => self.background = Self::parse_color(p, &mut iter),
58..=59 => self.underlined = Self::parse_color(p, &mut iter),
90..=97 => self.foreground = Self::parse_color(p, &mut iter),
100..=107 => self.foreground = Self::parse_color(p, &mut iter),
_ => {
// Unsupported SGR sequence.
// Be compatible and pretend one just wasn't was provided.
}
}
}
true
}
fn update_with_csi(&mut self, finalizer: char, sequence: &str) -> bool {
if finalizer == 'm' {
self.update_with_sgr(sequence)
} else {
false
}
}
fn update_with_unsupported(&mut self, sequence: &str) -> bool {
self.unknown_buffer.push_str(sequence);
false
}
fn update_with_charset(&mut self, kind: char, set: impl Iterator<Item = char>) -> bool {
self.charset = format!("\x1B{}{}", kind, set.take(1).collect::<String>());
true
}
fn parse_color(color: u16, parameters: &mut dyn Iterator<Item = u16>) -> String {
match color % 10 {
8 => match parameters.next() {
Some(5) /* 256-color */ => format!("\x1B[{};5;{}m", color, join(";", 1, parameters)),
Some(2) /* 24-bit color */ => format!("\x1B[{};2;{}m", color, join(";", 3, parameters)),
Some(c) => format!("\x1B[{};{}m", color, c),
_ => "".to_owned(),
},
9 => "".to_owned(),
_ => format!("\x1B[{}m", color),
}
}
}
impl Display for Attributes {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(
f,
"{}{}{}{}{}{}{}{}{}",
self.foreground,
self.background,
self.underlined,
self.charset,
self.bold,
self.dim,
self.underline,
self.italic,
self.strike,
)
}
}
fn join(
delimiter: &str,
limit: usize,
iterator: &mut dyn Iterator<Item = impl ToString>,
) -> String {
iterator
.take(limit)
.map(|i| i.to_string())
.collect::<Vec<String>>()
.join(delimiter)
}
|
