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//! Defines token tags we use for syntax highlighting.
//! A tag is not unlike a CSS class.
use std::{fmt, ops};
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct Highlight {
pub tag: HighlightTag,
pub modifiers: HighlightModifiers,
}
#[derive(Default, Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub struct HighlightModifiers(u32);
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
pub enum HighlightTag {
Field,
Function,
Module,
Constant,
Macro,
Variable,
Type,
TypeSelf,
TypeParam,
TypeLifetime,
LiteralByte,
LiteralNumeric,
LiteralChar,
Comment,
LiteralString,
Attribute,
Keyword,
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)]
#[repr(u8)]
pub enum HighlightModifier {
Mutable = 0,
Unsafe,
/// Used with keywords like `if` and `break`.
Control,
Builtin,
}
impl HighlightTag {
fn as_str(self) -> &'static str {
match self {
HighlightTag::Field => "field",
HighlightTag::Function => "function",
HighlightTag::Module => "module",
HighlightTag::Constant => "constant",
HighlightTag::Macro => "macro",
HighlightTag::Variable => "variable",
HighlightTag::Type => "type",
HighlightTag::TypeSelf => "type.self",
HighlightTag::TypeParam => "type.param",
HighlightTag::TypeLifetime => "type.lifetime",
HighlightTag::LiteralByte => "literal.byte",
HighlightTag::LiteralNumeric => "literal.numeric",
HighlightTag::LiteralChar => "literal.char",
HighlightTag::Comment => "comment",
HighlightTag::LiteralString => "string",
HighlightTag::Attribute => "attribute",
HighlightTag::Keyword => "keyword",
}
}
}
impl fmt::Display for HighlightTag {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(self.as_str(), f)
}
}
impl HighlightModifier {
const ALL: &'static [HighlightModifier] = &[
HighlightModifier::Mutable,
HighlightModifier::Unsafe,
HighlightModifier::Control,
HighlightModifier::Builtin,
];
fn as_str(self) -> &'static str {
match self {
HighlightModifier::Mutable => "mutable",
HighlightModifier::Unsafe => "unsafe",
HighlightModifier::Control => "control",
HighlightModifier::Builtin => "builtin",
}
}
fn mask(self) -> u32 {
1 << (self as u32)
}
}
impl fmt::Display for HighlightModifier {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt::Display::fmt(self.as_str(), f)
}
}
impl fmt::Display for Highlight {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.tag)?;
for modifier in self.modifiers.iter() {
write!(f, ".{}", modifier)?
}
Ok(())
}
}
impl From<HighlightTag> for Highlight {
fn from(tag: HighlightTag) -> Highlight {
Highlight::new(tag)
}
}
impl Highlight {
pub(crate) fn new(tag: HighlightTag) -> Highlight {
Highlight { tag, modifiers: HighlightModifiers::default() }
}
}
impl ops::BitOr<HighlightModifier> for HighlightTag {
type Output = Highlight;
fn bitor(self, rhs: HighlightModifier) -> Highlight {
Highlight::new(self) | rhs
}
}
impl ops::BitOrAssign<HighlightModifier> for HighlightModifiers {
fn bitor_assign(&mut self, rhs: HighlightModifier) {
self.0 |= rhs.mask();
}
}
impl ops::BitOrAssign<HighlightModifier> for Highlight {
fn bitor_assign(&mut self, rhs: HighlightModifier) {
self.modifiers |= rhs;
}
}
impl ops::BitOr<HighlightModifier> for Highlight {
type Output = Highlight;
fn bitor(mut self, rhs: HighlightModifier) -> Highlight {
self |= rhs;
self
}
}
impl HighlightModifiers {
pub fn iter(self) -> impl Iterator<Item = HighlightModifier> {
HighlightModifier::ALL.iter().copied().filter(move |it| self.0 & it.mask() == it.mask())
}
}
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