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|
use std::collections::HashMap;
use log::warn;
use serde::{Deserialize, Deserializer};
use toml::Value;
#[cfg(feature = "term")]
pub use tui::style::{Color, Modifier, Style};
// #[derive(Clone, Copy, PartialEq, Eq, Default, Hash)]
// pub struct Color {
// pub r: u8,
// pub g: u8,
// pub b: u8,
// }
// impl Color {
// pub fn new(r: u8, g: u8, b: u8) -> Self {
// Self { r, g, b }
// }
// }
// #[cfg(feature = "term")]
// impl Into<tui::style::Color> for Color {
// fn into(self) -> tui::style::Color {
// tui::style::Color::Rgb(self.r, self.g, self.b)
// }
// }
// impl std::str::FromStr for Color {
// type Err = ();
// /// Tries to parse a string (`'#FFFFFF'` or `'FFFFFF'`) into RGB.
// fn from_str(input: &str) -> Result<Self, Self::Err> {
// let input = input.trim();
// let input = match (input.chars().next(), input.len()) {
// (Some('#'), 7) => &input[1..],
// (_, 6) => input,
// _ => return Err(()),
// };
// u32::from_str_radix(&input, 16)
// .map(|s| Color {
// r: ((s >> 16) & 0xFF) as u8,
// g: ((s >> 8) & 0xFF) as u8,
// b: (s & 0xFF) as u8,
// })
// .map_err(|_| ())
// }
// }
// #[derive(Clone, Copy, PartialEq, Eq, Default, Hash)]
// pub struct Style {
// pub fg: Option<Color>,
// pub bg: Option<Color>,
// // TODO: modifiers (bold, underline, italic, etc)
// }
// impl Style {
// pub fn fg(mut self, fg: Color) -> Self {
// self.fg = Some(fg);
// self
// }
// pub fn bg(mut self, bg: Color) -> Self {
// self.bg = Some(bg);
// self
// }
// }
// #[cfg(feature = "term")]
// impl Into<tui::style::Style> for Style {
// fn into(self) -> tui::style::Style {
// let style = tui::style::Style::default();
// if let Some(fg) = self.fg {
// style.fg(fg.into());
// }
// if let Some(bg) = self.bg {
// style.bg(bg.into());
// }
// style
// }
// }
/// Color theme for syntax highlighting.
#[derive(Debug)]
pub struct Theme {
scopes: Vec<String>,
styles: HashMap<String, Style>,
}
impl<'de> Deserialize<'de> for Theme {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let mut styles = HashMap::new();
if let Ok(colors) = HashMap::<String, Value>::deserialize(deserializer) {
// scopes.reserve(colors.len());
styles.reserve(colors.len());
for (name, style_value) in colors {
let mut style = Style::default();
parse_style(&mut style, style_value);
// scopes.push(name);
styles.insert(name, style);
}
}
let scopes = styles.keys().map(ToString::to_string).collect();
Ok(Self { scopes, styles })
}
}
fn parse_style(style: &mut Style, value: Value) {
//TODO: alert user of parsing failures
if let Value::Table(entries) = value {
for (name, value) in entries {
match name.as_str() {
"fg" => {
if let Some(color) = parse_color(value) {
*style = style.fg(color);
}
}
"bg" => {
if let Some(color) = parse_color(value) {
*style = style.bg(color);
}
}
"modifiers" => {
if let Value::Array(arr) = value {
for modifier in arr.iter().filter_map(parse_modifier) {
*style = style.add_modifier(modifier);
}
}
}
_ => (),
}
}
} else if let Some(color) = parse_color(value) {
*style = style.fg(color);
}
}
fn hex_string_to_rgb(s: &str) -> Option<(u8, u8, u8)> {
if s.starts_with('#') && s.len() >= 7 {
if let (Ok(red), Ok(green), Ok(blue)) = (
u8::from_str_radix(&s[1..3], 16),
u8::from_str_radix(&s[3..5], 16),
u8::from_str_radix(&s[5..7], 16),
) {
Some((red, green, blue))
} else {
None
}
} else {
None
}
}
fn parse_color(value: Value) -> Option<Color> {
if let Value::String(s) = value {
if let Some((red, green, blue)) = hex_string_to_rgb(&s) {
Some(Color::Rgb(red, green, blue))
} else {
warn!("malformed hexcode in theme: {}", s);
None
}
} else {
warn!("unrecognized value in theme: {}", value);
None
}
}
fn parse_modifier(value: &Value) -> Option<Modifier> {
if let Value::String(s) = value {
match s.as_str() {
"bold" => Some(Modifier::BOLD),
"dim" => Some(Modifier::DIM),
"italic" => Some(Modifier::ITALIC),
"underlined" => Some(Modifier::UNDERLINED),
"slow_blink" => Some(Modifier::SLOW_BLINK),
"rapid_blink" => Some(Modifier::RAPID_BLINK),
"reversed" => Some(Modifier::REVERSED),
"hidden" => Some(Modifier::HIDDEN),
"crossed_out" => Some(Modifier::CROSSED_OUT),
_ => {
warn!("unrecognized modifier in theme: {}", s);
None
}
}
} else {
warn!("unrecognized modifier in theme: {}", value);
None
}
}
impl Theme {
pub fn get(&self, scope: &str) -> Style {
self.styles
.get(scope)
.copied()
.unwrap_or_else(|| Style::default().fg(Color::Rgb(0, 0, 255)))
}
#[inline]
pub fn scopes(&self) -> &[String] {
&self.scopes
}
}
#[test]
fn test_parse_style_string() {
let fg = Value::String("#ffffff".to_string());
let mut style = Style::default();
parse_style(&mut style, fg);
assert_eq!(style, Style::default().fg(Color::Rgb(255, 255, 255)));
}
#[test]
fn test_parse_style_table() {
let table = toml::toml! {
"keyword" = {
fg = "#ffffff",
bg = "#000000",
modifiers = ["bold"],
}
};
let mut style = Style::default();
if let Value::Table(entries) = table {
for (_name, value) in entries {
parse_style(&mut style, value);
}
}
assert_eq!(
style,
Style::default()
.fg(Color::Rgb(255, 255, 255))
.bg(Color::Rgb(0, 0, 0))
.add_modifier(Modifier::BOLD)
);
}
|
