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use serde::de::{self, Unexpected, Visitor};
use std::fmt;
use std::marker::PhantomData;
use termion::color;
#[derive(Debug)]
pub struct Color(Box<dyn color::Color>);
unsafe impl Sync for Color {}
unsafe impl Send for Color {}
impl Color {
pub fn new<C: color::Color + 'static>(c: C) -> Self {
Color(Box::new(c))
}
}
impl color::Color for Color {
fn write_fg(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.write_fg(f)
}
fn write_bg(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.write_bg(f)
}
}
impl<'a> color::Color for &'a Color {
fn write_fg(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.write_fg(f)
}
fn write_bg(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.write_bg(f)
}
}
pub struct ColorVisitor {
marker: PhantomData<fn() -> Color>,
}
impl ColorVisitor {
fn new() -> Self {
ColorVisitor {
marker: PhantomData,
}
}
}
impl<'de> Visitor<'de> for ColorVisitor {
type Value = Color;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("A color")
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: de::Error,
{
match v.to_lowercase().as_ref() {
"black" => Ok(Color(Box::new(color::Black))),
"blue" => Ok(Color(Box::new(color::Blue))),
"cyan" => Ok(Color(Box::new(color::Cyan))),
"green" => Ok(Color(Box::new(color::Green))),
"light black" | "light_black" => {
Ok(Color(Box::new(color::LightBlack)))
}
"light blue" | "light_blue" => {
Ok(Color(Box::new(color::LightBlue)))
}
"light cyan" | "light_cyan" => {
Ok(Color(Box::new(color::LightCyan)))
}
"light green" | "light_green" => {
Ok(Color(Box::new(color::LightGreen)))
}
"light magenta" | "light_magenta" => {
Ok(Color(Box::new(color::LightMagenta)))
}
"light red" | "light_red" => Ok(Color(Box::new(color::LightRed))),
"light white" | "light_white" => {
Ok(Color(Box::new(color::LightWhite)))
}
"light yellow" | "light_yellow" => {
Ok(Color(Box::new(color::LightYellow)))
}
"magenta" => Ok(Color(Box::new(color::Magenta))),
"magenta" => Ok(Color(Box::new(color::Magenta))),
"red" => Ok(Color(Box::new(color::Red))),
"white" => Ok(Color(Box::new(color::White))),
"yellow" => Ok(Color(Box::new(color::Yellow))),
_ => Err(de::Error::invalid_value(
Unexpected::Str(v),
&"a valid color",
)),
}
}
fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
where
A: de::MapAccess<'de>,
{
let mut red = None;
let mut green = None;
let mut blue = None;
while let Some((k, v)) = map.next_entry()? {
match k {
"red" => {
red = Some(v);
}
"green" => {
green = Some(v);
}
"blue" => {
blue = Some(v);
}
_ => {
return Err(de::Error::unknown_field(
k,
&["red", "green", "blue"],
));
}
}
}
match (red, green, blue) {
(Some(r), Some(g), Some(b)) => {
Ok(Color(Box::new(color::Rgb(r, g, b))))
}
(None, _, _) => Err(de::Error::missing_field("red")),
(_, None, _) => Err(de::Error::missing_field("green")),
(_, _, None) => Err(de::Error::missing_field("blue")),
}
}
fn visit_u8<E: de::Error>(self, v: u8) -> Result<Self::Value, E> {
Ok(Color(Box::new(color::AnsiValue(v))))
}
}
impl<'de> serde::Deserialize<'de> for Color {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::Deserializer<'de>,
{
deserializer.deserialize_any(ColorVisitor::new())
}
}
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