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Improve handling of ANSI passthrough
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,212 @@ | ||
| use std::fmt::{Display, Formatter}; | ||
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| // Wrapper to avoid unnecessary branching when input doesn't have ANSI escape sequences. | ||
| pub struct AnsiStyle { | ||
| attributes: Option<Attributes>, | ||
| } | ||
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| impl AnsiStyle { | ||
| pub fn new() -> Self { | ||
| AnsiStyle { attributes: None } | ||
| } | ||
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| 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) | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| impl Display for AnsiStyle { | ||
| fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result { | ||
| match self.attributes { | ||
| Some(ref a) => a.fmt(f), | ||
| None => Ok(()), | ||
| } | ||
| } | ||
| } | ||
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| struct Attributes { | ||
| foreground: String, | ||
| background: String, | ||
| underlined: String, | ||
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| /// The character set to use. | ||
| /// REGEX: `\^[()][AB0-3]` | ||
| charset: String, | ||
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| /// A buffer for unknown sequences. | ||
| unknown_buffer: String, | ||
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| /// ON: ^[1m | ||
| /// OFF: ^[22m | ||
| bold: String, | ||
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| /// ON: ^[2m | ||
| /// OFF: ^[22m | ||
| dim: String, | ||
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| /// ON: ^[4m | ||
| /// OFF: ^[24m | ||
| underline: String, | ||
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| /// ON: ^[3m | ||
| /// OFF: ^[23m | ||
| italic: String, | ||
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| /// ON: ^[9m | ||
| /// OFF: ^[29m | ||
| strike: String, | ||
| } | ||
|
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| 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(), | ||
| } | ||
| } | ||
|
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| /// 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); | ||
|
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| 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 | ||
| } | ||
| } | ||
|
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| 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(); | ||
| } | ||
|
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| 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. | ||
|
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| 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. | ||
| } | ||
| } | ||
| } | ||
|
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| true | ||
| } | ||
|
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| fn update_with_csi(&mut self, finalizer: char, sequence: &str) -> bool { | ||
| if finalizer == 'm' { | ||
| self.update_with_sgr(sequence) | ||
| } else { | ||
| false | ||
| } | ||
| } | ||
|
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| fn update_with_unsupported(&mut self, sequence: &str) -> bool { | ||
| self.unknown_buffer.push_str(&sequence); | ||
| false | ||
| } | ||
|
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| 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 | ||
| } | ||
|
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| 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), | ||
| } | ||
| } | ||
| } | ||
|
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| 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, | ||
| ) | ||
| } | ||
| } | ||
|
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| 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) | ||
| } |