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|
//! A module which contains [Colors] trait and its blanket implementations.
use crate::{color::Color, config::Position};
/// A trait which represents map of colors.
pub trait Colors {
/// Color implementation.
type Color: Color;
/// Returns a color for a given position.
fn get_color(&self, pos: (usize, usize)) -> Option<&Self::Color>;
}
impl<C> Colors for &'_ C
where
C: Colors,
{
type Color = C::Color;
fn get_color(&self, pos: Position) -> Option<&Self::Color> {
C::get_color(self, pos)
}
}
#[cfg(feature = "std")]
impl<C> Colors for std::collections::HashMap<Position, C>
where
C: Color,
{
type Color = C;
fn get_color(&self, pos: Position) -> Option<&Self::Color> {
self.get(&pos)
}
}
#[cfg(feature = "std")]
impl<C> Colors for std::collections::BTreeMap<Position, C>
where
C: Color,
{
type Color = C;
fn get_color(&self, pos: Position) -> Option<&Self::Color> {
self.get(&pos)
}
}
#[cfg(feature = "std")]
impl<C> Colors for crate::config::spanned::EntityMap<Option<C>>
where
C: Color,
{
type Color = C;
fn get_color(&self, pos: Position) -> Option<&Self::Color> {
self.get(pos.into()).as_ref()
}
}
/// The structure represents empty [`Colors`] map.
#[derive(Debug, Default, Clone)]
pub struct NoColors;
impl Colors for NoColors {
type Color = EmptyColor;
fn get_color(&self, _: Position) -> Option<&Self::Color> {
None
}
}
/// A color which is actually has not value.
#[derive(Debug)]
pub struct EmptyColor;
impl Color for EmptyColor {
fn fmt_prefix<W: core::fmt::Write>(&self, _: &mut W) -> core::fmt::Result {
Ok(())
}
fn colorize<W: core::fmt::Write>(&self, _: &mut W, _: &str) -> core::fmt::Result {
Ok(())
}
fn fmt_suffix<W: core::fmt::Write>(&self, _: &mut W) -> core::fmt::Result {
Ok(())
}
}
|
