1//! A module which contains [Colors] trait and its blanket implementations.
2
3use crate::{ansi::ANSIFmt, config::Position};
4
5/// A trait which represents map of colors.
6pub trait Colors {
7 /// Color implementation.
8 type Color: ANSIFmt;
9
10 /// Returns a color for a given position.
11 fn get_color(&self, pos: (usize, usize)) -> Option<&Self::Color>;
12
13 /// Verifies whether a map is empty or not.
14 fn is_empty(&self) -> bool;
15}
16
17impl<C> Colors for &'_ C
18where
19 C: Colors,
20{
21 type Color = C::Color;
22
23 fn get_color(&self, pos: Position) -> Option<&Self::Color> {
24 C::get_color(self, pos)
25 }
26
27 fn is_empty(&self) -> bool {
28 C::is_empty(self)
29 }
30}
31
32#[cfg(feature = "std")]
33impl<C> Colors for std::collections::HashMap<Position, C>
34where
35 C: ANSIFmt,
36{
37 type Color = C;
38
39 fn get_color(&self, pos: Position) -> Option<&Self::Color> {
40 self.get(&pos)
41 }
42
43 fn is_empty(&self) -> bool {
44 std::collections::HashMap::is_empty(self)
45 }
46}
47
48#[cfg(feature = "std")]
49impl<C> Colors for std::collections::BTreeMap<Position, C>
50where
51 C: ANSIFmt,
52{
53 type Color = C;
54
55 fn get_color(&self, pos: Position) -> Option<&Self::Color> {
56 self.get(&pos)
57 }
58
59 fn is_empty(&self) -> bool {
60 std::collections::BTreeMap::is_empty(self)
61 }
62}
63
64#[cfg(feature = "std")]
65impl<C> Colors for crate::config::spanned::EntityMap<Option<C>>
66where
67 C: ANSIFmt,
68{
69 type Color = C;
70
71 fn get_color(&self, pos: Position) -> Option<&Self::Color> {
72 self.get(entity:pos.into()).as_ref()
73 }
74
75 fn is_empty(&self) -> bool {
76 crate::config::spanned::EntityMap::is_empty(self)
77 && self.get(crate::config::Entity::Global).is_none()
78 }
79}
80
81/// The structure represents empty [`Colors`] map.
82#[derive(Debug, Default, Clone)]
83pub struct NoColors;
84
85impl Colors for NoColors {
86 type Color = EmptyColor;
87
88 fn get_color(&self, _: Position) -> Option<&Self::Color> {
89 None
90 }
91
92 fn is_empty(&self) -> bool {
93 true
94 }
95}
96
97/// A color which is actually has not value.
98#[derive(Debug)]
99pub struct EmptyColor;
100
101impl ANSIFmt for EmptyColor {
102 fn fmt_ansi_prefix<W: core::fmt::Write>(&self, _: &mut W) -> core::fmt::Result {
103 Ok(())
104 }
105
106 fn fmt_ansi_suffix<W: core::fmt::Write>(&self, _: &mut W) -> core::fmt::Result {
107 Ok(())
108 }
109}
110