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