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color.rs
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color.rs
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use std::{convert::AsRef, convert::TryFrom, result::Result, str::FromStr};
#[cfg(feature = "serde")]
use std::fmt;
use crate::style::parse_next_u8;
/// Represents a color.
///
/// # Platform-specific Notes
///
/// The following list of 16 base colors are available for almost all terminals (Windows 7 and 8 included).
///
/// | Light | Dark |
/// | :--| :-- |
/// | `DarkGrey` | `Black` |
/// | `Red` | `DarkRed` |
/// | `Green` | `DarkGreen` |
/// | `Yellow` | `DarkYellow` |
/// | `Blue` | `DarkBlue` |
/// | `Magenta` | `DarkMagenta` |
/// | `Cyan` | `DarkCyan` |
/// | `White` | `Grey` |
///
/// Most UNIX terminals and Windows 10 consoles support additional colors.
/// See [`Color::Rgb`] or [`Color::AnsiValue`] for more info.
#[derive(Copy, Clone, Debug, PartialEq, Eq, Ord, PartialOrd, Hash)]
pub enum Color {
/// Resets the terminal color.
Reset,
/// Black color.
Black,
/// Dark grey color.
DarkGrey,
/// Light red color.
Red,
/// Dark red color.
DarkRed,
/// Light green color.
Green,
/// Dark green color.
DarkGreen,
/// Light yellow color.
Yellow,
/// Dark yellow color.
DarkYellow,
/// Light blue color.
Blue,
/// Dark blue color.
DarkBlue,
/// Light magenta color.
Magenta,
/// Dark magenta color.
DarkMagenta,
/// Light cyan color.
Cyan,
/// Dark cyan color.
DarkCyan,
/// White color.
White,
/// Grey color.
Grey,
/// An RGB color. See [RGB color model](https://en.wikipedia.org/wiki/RGB_color_model) for more info.
///
/// Most UNIX terminals and Windows 10 supported only.
/// See [Platform-specific notes](enum.Color.html#platform-specific-notes) for more info.
Rgb { r: u8, g: u8, b: u8 },
/// An ANSI color. See [256 colors - cheat sheet](https://jonasjacek.github.io/colors/) for more info.
///
/// Most UNIX terminals and Windows 10 supported only.
/// See [Platform-specific notes](enum.Color.html#platform-specific-notes) for more info.
AnsiValue(u8),
}
impl Color {
/// Parses an ANSI color sequence.
///
/// # Examples
///
/// ```
/// use crossterm::style::Color;
///
/// assert_eq!(Color::parse_ansi("5;0"), Some(Color::Black));
/// assert_eq!(Color::parse_ansi("5;26"), Some(Color::AnsiValue(26)));
/// assert_eq!(Color::parse_ansi("2;50;60;70"), Some(Color::Rgb { r: 50, g: 60, b: 70 }));
/// assert_eq!(Color::parse_ansi("invalid color"), None);
/// ```
///
/// Currently, 3/4 bit color values aren't supported so return `None`.
///
/// See also: [`Colored::parse_ansi`](crate::style::Colored::parse_ansi).
pub fn parse_ansi(ansi: &str) -> Option<Self> {
Self::parse_ansi_iter(&mut ansi.split(';'))
}
/// The logic for parse_ansi, takes an iterator of the sequences terms (the numbers between the
/// ';'). It's a separate function so it can be used by both Color::parse_ansi and
/// colored::parse_ansi.
/// Tested in Colored tests.
pub(crate) fn parse_ansi_iter<'a>(values: &mut impl Iterator<Item = &'a str>) -> Option<Self> {
let color = match parse_next_u8(values)? {
// 8 bit colors: `5;<n>`
5 => {
let n = parse_next_u8(values)?;
use Color::*;
[
Black, // 0
DarkRed, // 1
DarkGreen, // 2
DarkYellow, // 3
DarkBlue, // 4
DarkMagenta, // 5
DarkCyan, // 6
Grey, // 7
DarkGrey, // 8
Red, // 9
Green, // 10
Yellow, // 11
Blue, // 12
Magenta, // 13
Cyan, // 14
White, // 15
]
.get(n as usize)
.copied()
.unwrap_or(Color::AnsiValue(n))
}
// 24 bit colors: `2;<r>;<g>;<b>`
2 => Color::Rgb {
r: parse_next_u8(values)?,
g: parse_next_u8(values)?,
b: parse_next_u8(values)?,
},
_ => return None,
};
// If there's another value, it's unexpected so return None.
if values.next().is_some() {
return None;
}
Some(color)
}
}
impl TryFrom<&str> for Color {
type Error = ();
/// Try to create a `Color` from the string representation. This returns an error if the string does not match.
fn try_from(src: &str) -> Result<Self, Self::Error> {
let src = src.to_lowercase();
match src.as_ref() {
"black" => Ok(Color::Black),
"dark_grey" => Ok(Color::DarkGrey),
"red" => Ok(Color::Red),
"dark_red" => Ok(Color::DarkRed),
"green" => Ok(Color::Green),
"dark_green" => Ok(Color::DarkGreen),
"yellow" => Ok(Color::Yellow),
"dark_yellow" => Ok(Color::DarkYellow),
"blue" => Ok(Color::Blue),
"dark_blue" => Ok(Color::DarkBlue),
"magenta" => Ok(Color::Magenta),
"dark_magenta" => Ok(Color::DarkMagenta),
"cyan" => Ok(Color::Cyan),
"dark_cyan" => Ok(Color::DarkCyan),
"white" => Ok(Color::White),
"grey" => Ok(Color::Grey),
_ => Err(()),
}
}
}
impl FromStr for Color {
type Err = ();
/// Creates a `Color` from the string representation.
///
/// # Notes
///
/// * Returns `Color::White` in case of an unknown color.
/// * Does not return `Err` and you can safely unwrap.
fn from_str(src: &str) -> Result<Self, Self::Err> {
Ok(Color::try_from(src).unwrap_or(Color::White))
}
}
impl From<(u8, u8, u8)> for Color {
/// Creates a 'Color' from the tuple representation.
fn from(val: (u8, u8, u8)) -> Self {
let (r, g, b) = val;
Self::Rgb { r, g, b }
}
}
#[cfg(feature = "serde")]
impl serde::ser::Serialize for Color {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::ser::Serializer,
{
let str = match *self {
Color::Black => "black",
Color::DarkGrey => "dark_grey",
Color::Red => "red",
Color::DarkRed => "dark_red",
Color::Green => "green",
Color::DarkGreen => "dark_green",
Color::Yellow => "yellow",
Color::DarkYellow => "dark_yellow",
Color::Blue => "blue",
Color::DarkBlue => "dark_blue",
Color::Magenta => "magenta",
Color::DarkMagenta => "dark_magenta",
Color::Cyan => "cyan",
Color::DarkCyan => "dark_cyan",
Color::White => "white",
Color::Grey => "grey",
_ => "",
};
if str == "" {
println!("color: {:?}", self);
match *self {
Color::AnsiValue(value) => {
return serializer.serialize_str(&format!("ansi_({})", value));
}
Color::Rgb { r, g, b } => {
return serializer.serialize_str(&format!("rgb_({},{},{})", r, g, b));
}
_ => {
return Err(serde::ser::Error::custom("Could not serialize enum type"));
}
}
} else {
return serializer.serialize_str(str);
}
}
}
#[cfg(feature = "serde")]
impl<'de> serde::de::Deserialize<'de> for Color {
fn deserialize<D>(deserializer: D) -> Result<Color, D::Error>
where
D: serde::de::Deserializer<'de>,
{
struct ColorVisitor;
impl<'de> serde::de::Visitor<'de> for ColorVisitor {
type Value = Color;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str(
"`black`, `blue`, `dark_blue`, `cyan`, `dark_cyan`, `green`, `dark_green`, `grey`, `dark_grey`, `magenta`, `dark_magenta`, `red`, `dark_red`, `white`, `yellow`, `dark_yellow`, `ansi_(value)`, or `rgb_(r,g,b)`",
)
}
fn visit_str<E>(self, value: &str) -> Result<Color, E>
where
E: serde::de::Error,
{
if let Ok(c) = Color::try_from(value) {
Ok(c)
} else {
if value.contains("ansi") {
// strip away `ansi_(..)' and get the inner value between parenthesis.
let results = value.replace("ansi_(", "").replace(")", "");
let ansi_val = results.parse::<u8>();
if let Ok(ansi) = ansi_val {
return Ok(Color::AnsiValue(ansi));
}
} else if value.contains("rgb") {
// strip away `rgb_(..)' and get the inner values between parenthesis.
let results = value
.replace("rgb_(", "")
.replace(")", "")
.split(',')
.map(|x| x.to_string())
.collect::<Vec<String>>();
if results.len() == 3 {
let r = results[0].parse::<u8>();
let g = results[1].parse::<u8>();
let b = results[2].parse::<u8>();
if r.is_ok() && g.is_ok() && b.is_ok() {
return Ok(Color::Rgb {
r: r.unwrap(),
g: g.unwrap(),
b: b.unwrap(),
});
}
}
}
Err(E::invalid_value(serde::de::Unexpected::Str(value), &self))
}
}
}
deserializer.deserialize_str(ColorVisitor)
}
}
#[cfg(test)]
mod tests {
use super::Color;
#[test]
fn test_known_color_conversion() {
assert_eq!("grey".parse(), Ok(Color::Grey));
assert_eq!("dark_grey".parse(), Ok(Color::DarkGrey));
assert_eq!("red".parse(), Ok(Color::Red));
assert_eq!("dark_red".parse(), Ok(Color::DarkRed));
assert_eq!("green".parse(), Ok(Color::Green));
assert_eq!("dark_green".parse(), Ok(Color::DarkGreen));
assert_eq!("yellow".parse(), Ok(Color::Yellow));
assert_eq!("dark_yellow".parse(), Ok(Color::DarkYellow));
assert_eq!("blue".parse(), Ok(Color::Blue));
assert_eq!("dark_blue".parse(), Ok(Color::DarkBlue));
assert_eq!("magenta".parse(), Ok(Color::Magenta));
assert_eq!("dark_magenta".parse(), Ok(Color::DarkMagenta));
assert_eq!("cyan".parse(), Ok(Color::Cyan));
assert_eq!("dark_cyan".parse(), Ok(Color::DarkCyan));
assert_eq!("white".parse(), Ok(Color::White));
assert_eq!("black".parse(), Ok(Color::Black));
}
#[test]
fn test_unknown_color_conversion_yields_white() {
assert_eq!("foo".parse(), Ok(Color::White));
}
#[test]
fn test_know_rgb_color_conversion() {
assert_eq!(Color::from((0, 0, 0)), Color::Rgb { r: 0, g: 0, b: 0 });
assert_eq!(
Color::from((255, 255, 255)),
Color::Rgb {
r: 255,
g: 255,
b: 255
}
);
}
}
#[cfg(test)]
#[cfg(feature = "serde")]
mod serde_tests {
use super::Color;
use serde_json;
#[test]
fn test_deserial_known_color_conversion() {
assert_eq!(
serde_json::from_str::<Color>("\"Red\"").unwrap(),
Color::Red
);
assert_eq!(
serde_json::from_str::<Color>("\"red\"").unwrap(),
Color::Red
);
assert_eq!(
serde_json::from_str::<Color>("\"dark_red\"").unwrap(),
Color::DarkRed
);
assert_eq!(
serde_json::from_str::<Color>("\"grey\"").unwrap(),
Color::Grey
);
assert_eq!(
serde_json::from_str::<Color>("\"dark_grey\"").unwrap(),
Color::DarkGrey
);
assert_eq!(
serde_json::from_str::<Color>("\"green\"").unwrap(),
Color::Green
);
assert_eq!(
serde_json::from_str::<Color>("\"dark_green\"").unwrap(),
Color::DarkGreen
);
assert_eq!(
serde_json::from_str::<Color>("\"yellow\"").unwrap(),
Color::Yellow
);
assert_eq!(
serde_json::from_str::<Color>("\"dark_yellow\"").unwrap(),
Color::DarkYellow
);
assert_eq!(
serde_json::from_str::<Color>("\"blue\"").unwrap(),
Color::Blue
);
assert_eq!(
serde_json::from_str::<Color>("\"dark_blue\"").unwrap(),
Color::DarkBlue
);
assert_eq!(
serde_json::from_str::<Color>("\"magenta\"").unwrap(),
Color::Magenta
);
assert_eq!(
serde_json::from_str::<Color>("\"dark_magenta\"").unwrap(),
Color::DarkMagenta
);
assert_eq!(
serde_json::from_str::<Color>("\"cyan\"").unwrap(),
Color::Cyan
);
assert_eq!(
serde_json::from_str::<Color>("\"dark_cyan\"").unwrap(),
Color::DarkCyan
);
assert_eq!(
serde_json::from_str::<Color>("\"white\"").unwrap(),
Color::White
);
assert_eq!(
serde_json::from_str::<Color>("\"black\"").unwrap(),
Color::Black
);
}
#[test]
fn test_deserial_unknown_color_conversion() {
assert!(serde_json::from_str::<Color>("\"unknown\"").is_err());
}
#[test]
fn test_deserial_ansi_value() {
assert_eq!(
serde_json::from_str::<Color>("\"ansi_(255)\"").unwrap(),
Color::AnsiValue(255)
);
}
#[test]
fn test_deserial_unvalid_ansi_value() {
assert!(serde_json::from_str::<Color>("\"ansi_(256)\"").is_err());
assert!(serde_json::from_str::<Color>("\"ansi_(-1)\"").is_err());
}
#[test]
fn test_deserial_rgb() {
assert_eq!(
serde_json::from_str::<Color>("\"rgb_(255,255,255)\"").unwrap(),
Color::from((255, 255, 255))
);
}
#[test]
fn test_deserial_unvalid_rgb() {
assert!(serde_json::from_str::<Color>("\"rgb_(255,255,255,255)\"").is_err());
assert!(serde_json::from_str::<Color>("\"rgb_(256,255,255)\"").is_err());
}
}