2023-06-04 03:13:57 +08:00
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use std::cmp::Ordering;
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2023-02-27 04:56:50 +08:00
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use crate::{
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wchar::{widestrs, wstr, WExt, WString, L},
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wutil::sprintf,
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};
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#[derive(Debug, Copy, Clone, PartialEq, Eq)]
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pub struct Color24 {
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pub r: u8,
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pub g: u8,
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pub b: u8,
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}
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impl Color24 {
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fn from_bits(bits: u32) -> Self {
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assert_eq!(bits >> 24, 0, "from_bits() called with non-zero high byte");
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Self {
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r: (bits >> 16) as u8,
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g: (bits >> 8) as u8,
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b: bits as u8,
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}
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}
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}
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#[derive(Debug, Copy, Clone, PartialEq, Eq)]
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pub enum Type {
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// TODO: remove this? Users should probably use `Option<RgbColor>` instead
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None,
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Named { idx: u8 },
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Rgb(Color24),
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Normal,
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Reset,
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}
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#[derive(Debug, Default, Copy, Clone, PartialEq, Eq)]
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pub struct Flags {
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pub bold: bool,
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pub underline: bool,
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pub italics: bool,
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pub dim: bool,
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pub reverse: bool,
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}
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impl Flags {
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// const eval workaround
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const DEFAULT: Self = Flags {
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bold: false,
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underline: false,
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italics: false,
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dim: false,
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reverse: false,
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};
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}
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/// A type that represents a color.
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#[derive(Debug, Copy, Clone, PartialEq, Eq)]
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pub struct RgbColor {
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pub typ: Type,
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pub flags: Flags,
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}
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impl RgbColor {
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/// The color white
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pub const WHITE: Self = Self {
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typ: Type::Named { idx: 7 },
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flags: Flags::DEFAULT,
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};
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/// The color black
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pub const BLACK: Self = Self {
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typ: Type::Named { idx: 0 },
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flags: Flags::DEFAULT,
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};
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/// The reset special color.
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pub const RESET: Self = Self {
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typ: Type::Reset,
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flags: Flags::DEFAULT,
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};
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/// The normal special color.
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pub const NORMAL: Self = Self {
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typ: Type::Normal,
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flags: Flags::DEFAULT,
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};
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/// The none special color.
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pub const NONE: Self = Self {
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typ: Type::None,
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flags: Flags::DEFAULT,
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};
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/// Parse a color from a string.
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pub fn from_wstr(s: &wstr) -> Option<Self> {
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Self::try_parse_special(s)
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.or_else(|| Self::try_parse_named(s))
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.or_else(|| Self::try_parse_rgb(s))
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}
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2023-06-04 03:13:57 +08:00
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/// Create an RGB color.
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pub fn from_rgb(r: u8, g: u8, b: u8) -> Self {
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Self {
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typ: Type::Rgb(Color24 { r, g, b }),
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flags: Flags::DEFAULT,
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}
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}
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2023-02-27 04:56:50 +08:00
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/// Returns whether the color is the normal special color.
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pub const fn is_normal(self) -> bool {
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matches!(self.typ, Type::Normal)
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}
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/// Returns whether the color is the reset special color.
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pub const fn is_reset(self) -> bool {
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matches!(self.typ, Type::Reset)
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}
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/// Returns whether the color is the none special color.
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pub const fn is_none(self) -> bool {
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matches!(self.typ, Type::None)
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}
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/// Returns whether the color is a named color (like "magenta").
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pub const fn is_named(self) -> bool {
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matches!(self.typ, Type::Named { .. })
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}
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/// Returns whether the color is specified via RGB components.
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pub const fn is_rgb(self) -> bool {
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matches!(self.typ, Type::Rgb(_))
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}
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/// Returns whether the color is special, that is, not rgb or named.
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pub const fn is_special(self) -> bool {
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!self.is_named() && !self.is_rgb()
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}
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/// Returns a description of the color.
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#[widestrs]
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pub fn description(self) -> WString {
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match self.typ {
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Type::None => WString::from_str("none"),
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Type::Named { idx } => {
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sprintf!("named(%d, %ls)"L, idx, name_for_color_idx(idx).unwrap())
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}
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Type::Rgb(c) => {
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sprintf!("rgb(0x%02x%02x%02x"L, c.r, c.g, c.b)
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}
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Type::Normal => WString::from_str("normal"),
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Type::Reset => WString::from_str("reset"),
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}
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}
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/// Returns the name index for the given color. Requires that the color be named or RGB.
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pub fn to_name_index(self) -> u8 {
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// TODO: This should look for the nearest color.
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match self.typ {
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Type::Named { idx } => idx,
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Type::Rgb(c) => term16_color_for_rgb(c),
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Type::None | Type::Normal | Type::Reset => {
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panic!("to_name_index() called on Color that's not named or RGB")
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}
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}
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}
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/// Returns the term256 index for the given color. Requires that the color be RGB.
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pub fn to_term256_index(self) -> u8 {
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let Type::Rgb(c) = self.typ else {
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panic!("Tried to get term256 index of non-RGB color");
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};
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term256_color_for_rgb(c)
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}
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/// Returns the 24 bit color for the given color. Requires that the color be RGB.
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pub const fn to_color24(self) -> Color24 {
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let Type::Rgb(c) = self.typ else {
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panic!("Tried to get color24 of non-RGB color");
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};
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c
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}
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/// Returns the names of all named colors.
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pub fn named_color_names() -> Vec<&'static wstr> {
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let mut v: Vec<_> = NAMED_COLORS
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.iter()
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.filter_map(|&NamedColor { name, hidden, .. }| (!hidden).then_some(name))
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.collect();
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// "normal" isn't really a color and does not have a color palette index or
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// RGB value. Therefore, it does not appear in the NAMED_COLORS table.
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// However, it is a legitimate color name for the "set_color" command so
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// include it in the publicly known list of colors. This is primarily so it
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// appears in the output of "set_color --print-colors".
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v.push(L!("normal"));
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v
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}
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/// Try parsing a special color name like "normal".
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#[widestrs]
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fn try_parse_special(special: &wstr) -> Option<Self> {
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// TODO: this is a very hot function, may need optimization by e.g. comparing length first,
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// depending on how well inlining of `simple_icase_compare` works
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let typ = if simple_icase_compare(special, "normal"L) == Ordering::Equal {
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Type::Normal
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} else if simple_icase_compare(special, "reset"L) == Ordering::Equal {
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Type::Reset
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} else {
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return None;
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};
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Some(Self {
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typ,
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flags: Flags::default(),
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})
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}
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/// Try parsing an rgb color like "#F0A030".
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///
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/// We support the following style of rgb formats (case insensitive):
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///
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/// - `#FA3`
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/// - `#F3A035`
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/// - `FA3`
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/// - `F3A035`
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fn try_parse_rgb(mut s: &wstr) -> Option<Self> {
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// Skip any leading #.
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if s.chars().next()? == '#' {
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s = &s[1..];
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}
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2023-06-04 03:13:57 +08:00
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let hex_digit = |i| -> Option<u8> {
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2023-02-27 04:56:50 +08:00
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s.char_at(i)
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.to_digit(16)
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.map(|n| n.try_into().expect("hex digit should always be < 256"))
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};
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2023-06-04 03:13:57 +08:00
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let r;
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let g;
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let b;
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if s.len() == 3 {
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2023-02-27 04:56:50 +08:00
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// Format: FA3
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2023-06-04 03:13:57 +08:00
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r = hex_digit(0)? * 16 + hex_digit(0)?;
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g = hex_digit(1)? * 16 + hex_digit(1)?;
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b = hex_digit(2)? * 16 + hex_digit(2)?;
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2023-02-27 04:56:50 +08:00
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} else if s.len() == 6 {
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// Format: F3A035
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2023-06-04 03:13:57 +08:00
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r = hex_digit(0)? * 16 + hex_digit(1)?;
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g = hex_digit(2)? * 16 + hex_digit(3)?;
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b = hex_digit(4)? * 16 + hex_digit(5)?;
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2023-02-27 04:56:50 +08:00
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} else {
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return None;
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2023-06-04 03:13:57 +08:00
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}
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Some(RgbColor::from_rgb(r, g, b))
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2023-02-27 04:56:50 +08:00
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}
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/// Try parsing an explicit color name like "magenta".
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fn try_parse_named(name: &wstr) -> Option<Self> {
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let i = NAMED_COLORS
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.binary_search_by(|c| simple_icase_compare(c.name, name))
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.ok()?;
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Some(Self {
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typ: Type::Named {
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idx: NAMED_COLORS[i].idx,
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},
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flags: Flags::default(),
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})
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}
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}
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/// Compare wide strings with simple ASCII canonicalization.
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#[inline(always)]
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fn simple_icase_compare(s1: &wstr, s2: &wstr) -> Ordering {
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let c1 = s1.chars().map(|c| c.to_ascii_lowercase());
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let c2 = s2.chars().map(|c| c.to_ascii_lowercase());
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c1.cmp(c2)
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}
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struct NamedColor {
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name: &'static wstr,
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idx: u8,
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rgb: [u8; 3],
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hidden: bool,
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}
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#[widestrs]
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#[rustfmt::skip]
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const NAMED_COLORS: &[NamedColor] = &[
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// Keep this sorted alphabetically
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NamedColor {name: "black"L, idx: 0, rgb: [0x00, 0x00, 0x00], hidden: false},
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NamedColor {name: "blue"L, idx: 4, rgb: [0x00, 0x00, 0x80], hidden: false},
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NamedColor {name: "brblack"L, idx: 8, rgb: [0x80, 0x80, 0x80], hidden: false},
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NamedColor {name: "brblue"L, idx: 12, rgb: [0x00, 0x00, 0xFF], hidden: false},
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NamedColor {name: "brbrown"L, idx: 11, rgb: [0xFF, 0xFF, 0x00], hidden: true},
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NamedColor {name: "brcyan"L, idx: 14, rgb: [0x00, 0xFF, 0xFF], hidden: false},
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NamedColor {name: "brgreen"L, idx: 10, rgb: [0x00, 0xFF, 0x00], hidden: false},
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NamedColor {name: "brgrey"L, idx: 8, rgb: [0x55, 0x55, 0x55], hidden: true},
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NamedColor {name: "brmagenta"L, idx: 13, rgb: [0xFF, 0x00, 0xFF], hidden: false},
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NamedColor {name: "brown"L, idx: 3, rgb: [0x72, 0x50, 0x00], hidden: true},
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NamedColor {name: "brpurple"L, idx: 13, rgb: [0xFF, 0x00, 0xFF], hidden: true},
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NamedColor {name: "brred"L, idx: 9, rgb: [0xFF, 0x00, 0x00], hidden: false},
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NamedColor {name: "brwhite"L, idx: 15, rgb: [0xFF, 0xFF, 0xFF], hidden: false},
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NamedColor {name: "bryellow"L, idx: 11, rgb: [0xFF, 0xFF, 0x00], hidden: false},
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NamedColor {name: "cyan"L, idx: 6, rgb: [0x00, 0x80, 0x80], hidden: false},
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NamedColor {name: "green"L, idx: 2, rgb: [0x00, 0x80, 0x00], hidden: false},
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NamedColor {name: "grey"L, idx: 7, rgb: [0xE5, 0xE5, 0xE5], hidden: true},
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NamedColor {name: "magenta"L, idx: 5, rgb: [0x80, 0x00, 0x80], hidden: false},
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NamedColor {name: "purple"L, idx: 5, rgb: [0x80, 0x00, 0x80], hidden: true},
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NamedColor {name: "red"L, idx: 1, rgb: [0x80, 0x00, 0x00], hidden: false},
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NamedColor {name: "white"L, idx: 7, rgb: [0xC0, 0xC0, 0xC0], hidden: false},
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NamedColor {name: "yellow"L, idx: 3, rgb: [0x80, 0x80, 0x00], hidden: false},
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];
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assert_sorted_by_name!(NAMED_COLORS);
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fn convert_color(color: Color24, colors: &[u32]) -> usize {
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2023-05-30 04:22:46 +08:00
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fn squared_difference(a: u8, b: u8) -> u32 {
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let a = u32::from(a);
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let b = u32::from(b);
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a.abs_diff(b).pow(2)
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2023-02-27 04:56:50 +08:00
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}
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colors
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.iter()
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.enumerate()
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.min_by_key(|&(_i, c)| {
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let Color24 { r, g, b } = Color24::from_bits(*c);
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squared_difference(r, color.r)
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+ squared_difference(g, color.g)
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+ squared_difference(b, color.b)
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})
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.expect("convert_color() called with empty color list")
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.0
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}
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fn name_for_color_idx(target_idx: u8) -> Option<&'static wstr> {
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NAMED_COLORS
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.iter()
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.find_map(|&NamedColor { name, idx, .. }| (idx == target_idx).then_some(name))
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}
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fn term16_color_for_rgb(color: Color24) -> u8 {
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const COLORS: &[u32] = &[
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0x000000, // Black
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0x800000, // Red
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0x008000, // Green
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0x808000, // Yellow
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0x000080, // Blue
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0x800080, // Magenta
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0x008080, // Cyan
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0xc0c0c0, // White
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0x808080, // Bright Black
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0xFF0000, // Bright Red
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0x00FF00, // Bright Green
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0xFFFF00, // Bright Yellow
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0x0000FF, // Bright Blue
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0xFF00FF, // Bright Magenta
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0x00FFFF, // Bright Cyan
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0xFFFFFF, // Bright White
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];
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convert_color(color, COLORS).try_into().unwrap()
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}
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fn term256_color_for_rgb(color: Color24) -> u8 {
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const COLORS: &[u32] = &[
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0x000000, 0x00005f, 0x000087, 0x0000af, 0x0000d7, 0x0000ff, 0x005f00, 0x005f5f, 0x005f87,
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0x005faf, 0x005fd7, 0x005fff, 0x008700, 0x00875f, 0x008787, 0x0087af, 0x0087d7, 0x0087ff,
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0x00af00, 0x00af5f, 0x00af87, 0x00afaf, 0x00afd7, 0x00afff, 0x00d700, 0x00d75f, 0x00d787,
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0x00d7af, 0x00d7d7, 0x00d7ff, 0x00ff00, 0x00ff5f, 0x00ff87, 0x00ffaf, 0x00ffd7, 0x00ffff,
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0x5f0000, 0x5f005f, 0x5f0087, 0x5f00af, 0x5f00d7, 0x5f00ff, 0x5f5f00, 0x5f5f5f, 0x5f5f87,
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0x5f5faf, 0x5f5fd7, 0x5f5fff, 0x5f8700, 0x5f875f, 0x5f8787, 0x5f87af, 0x5f87d7, 0x5f87ff,
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0x5faf00, 0x5faf5f, 0x5faf87, 0x5fafaf, 0x5fafd7, 0x5fafff, 0x5fd700, 0x5fd75f, 0x5fd787,
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0x5fd7af, 0x5fd7d7, 0x5fd7ff, 0x5fff00, 0x5fff5f, 0x5fff87, 0x5fffaf, 0x5fffd7, 0x5fffff,
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0x870000, 0x87005f, 0x870087, 0x8700af, 0x8700d7, 0x8700ff, 0x875f00, 0x875f5f, 0x875f87,
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0x875faf, 0x875fd7, 0x875fff, 0x878700, 0x87875f, 0x878787, 0x8787af, 0x8787d7, 0x8787ff,
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0x87af00, 0x87af5f, 0x87af87, 0x87afaf, 0x87afd7, 0x87afff, 0x87d700, 0x87d75f, 0x87d787,
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0x87d7af, 0x87d7d7, 0x87d7ff, 0x87ff00, 0x87ff5f, 0x87ff87, 0x87ffaf, 0x87ffd7, 0x87ffff,
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0xaf0000, 0xaf005f, 0xaf0087, 0xaf00af, 0xaf00d7, 0xaf00ff, 0xaf5f00, 0xaf5f5f, 0xaf5f87,
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0xaf5faf, 0xaf5fd7, 0xaf5fff, 0xaf8700, 0xaf875f, 0xaf8787, 0xaf87af, 0xaf87d7, 0xaf87ff,
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0xafaf00, 0xafaf5f, 0xafaf87, 0xafafaf, 0xafafd7, 0xafafff, 0xafd700, 0xafd75f, 0xafd787,
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0xafd7af, 0xafd7d7, 0xafd7ff, 0xafff00, 0xafff5f, 0xafff87, 0xafffaf, 0xafffd7, 0xafffff,
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0xd70000, 0xd7005f, 0xd70087, 0xd700af, 0xd700d7, 0xd700ff, 0xd75f00, 0xd75f5f, 0xd75f87,
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0xd75faf, 0xd75fd7, 0xd75fff, 0xd78700, 0xd7875f, 0xd78787, 0xd787af, 0xd787d7, 0xd787ff,
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0xd7af00, 0xd7af5f, 0xd7af87, 0xd7afaf, 0xd7afd7, 0xd7afff, 0xd7d700, 0xd7d75f, 0xd7d787,
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0xd7d7af, 0xd7d7d7, 0xd7d7ff, 0xd7ff00, 0xd7ff5f, 0xd7ff87, 0xd7ffaf, 0xd7ffd7, 0xd7ffff,
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0xff0000, 0xff005f, 0xff0087, 0xff00af, 0xff00d7, 0xff00ff, 0xff5f00, 0xff5f5f, 0xff5f87,
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0xff5faf, 0xff5fd7, 0xff5fff, 0xff8700, 0xff875f, 0xff8787, 0xff87af, 0xff87d7, 0xff87ff,
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0xffaf00, 0xffaf5f, 0xffaf87, 0xffafaf, 0xffafd7, 0xffafff, 0xffd700, 0xffd75f, 0xffd787,
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0xffd7af, 0xffd7d7, 0xffd7ff, 0xffff00, 0xffff5f, 0xffff87, 0xffffaf, 0xffffd7, 0xffffff,
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0x080808, 0x121212, 0x1c1c1c, 0x262626, 0x303030, 0x3a3a3a, 0x444444, 0x4e4e4e, 0x585858,
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0x626262, 0x6c6c6c, 0x767676, 0x808080, 0x8a8a8a, 0x949494, 0x9e9e9e, 0xa8a8a8, 0xb2b2b2,
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0xbcbcbc, 0xc6c6c6, 0xd0d0d0, 0xdadada, 0xe4e4e4, 0xeeeeee,
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];
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(16 + convert_color(color, COLORS)).try_into().unwrap()
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}
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#[cfg(test)]
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mod tests {
|
2023-05-30 04:22:46 +08:00
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use crate::{
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color::{Color24, Flags, RgbColor, Type},
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wchar::widestrs,
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};
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2023-02-27 04:56:50 +08:00
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#[test]
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#[widestrs]
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fn parse() {
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assert!(RgbColor::from_wstr("#FF00A0"L).unwrap().is_rgb());
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assert!(RgbColor::from_wstr("FF00A0"L).unwrap().is_rgb());
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assert!(RgbColor::from_wstr("#F30"L).unwrap().is_rgb());
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assert!(RgbColor::from_wstr("F30"L).unwrap().is_rgb());
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assert!(RgbColor::from_wstr("f30"L).unwrap().is_rgb());
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assert!(RgbColor::from_wstr("#FF30a5"L).unwrap().is_rgb());
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assert!(RgbColor::from_wstr("3f30"L).is_none());
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assert!(RgbColor::from_wstr("##f30"L).is_none());
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assert!(RgbColor::from_wstr("magenta"L).unwrap().is_named());
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assert!(RgbColor::from_wstr("MaGeNTa"L).unwrap().is_named());
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assert!(RgbColor::from_wstr("mooganta"L).is_none());
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|
|
}
|
2023-05-30 04:22:46 +08:00
|
|
|
|
2023-06-04 03:13:57 +08:00
|
|
|
#[test]
|
|
|
|
#[widestrs]
|
|
|
|
fn parse_rgb() {
|
|
|
|
assert!(RgbColor::from_wstr("##FF00A0"L) == None);
|
|
|
|
assert!(RgbColor::from_wstr("#FF00A0"L) == Some(RgbColor::from_rgb(0xff, 0x00, 0xa0)));
|
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|
|
assert!(RgbColor::from_wstr("FF00A0"L) == Some(RgbColor::from_rgb(0xff, 0x00, 0xa0)));
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|
|
assert!(RgbColor::from_wstr("FAF"L) == Some(RgbColor::from_rgb(0xff, 0xAA, 0xff)));
|
|
|
|
}
|
|
|
|
|
2023-05-30 04:22:46 +08:00
|
|
|
// Regression test for multiplicative overflow in convert_color.
|
|
|
|
#[test]
|
|
|
|
fn test_term16_color_for_rgb() {
|
|
|
|
for c in 0..=u8::MAX {
|
|
|
|
let color = RgbColor {
|
|
|
|
typ: Type::Rgb(Color24 { r: c, g: c, b: c }),
|
|
|
|
flags: Flags::DEFAULT,
|
|
|
|
};
|
|
|
|
let _ = color.to_name_index();
|
|
|
|
}
|
|
|
|
}
|
2023-02-27 04:56:50 +08:00
|
|
|
}
|