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// Acknowledgement:
// Based on rust-analyzer's `TokenSet`.
// https://github.com/rust-lang/rust-analyzer/blob/master/crates/parser/src/token_set.rs
use crate::SyntaxKind;
/// A set of syntax kinds.
#[derive(Default, Copy, Clone)]
pub struct SyntaxSet(u128);
impl SyntaxSet {
/// Create a new set from a slice of kinds.
pub const fn new(slice: &[SyntaxKind]) -> Self {
let mut bits = 0;
let mut i = 0;
while i < slice.len() {
bits |= bit(slice[i]);
i += 1;
}
Self(bits)
}
/// Insert a syntax kind into the set.
pub const fn union(self, other: Self) -> Self {
Self(self.0 | other.0)
}
/// Whether the set contains the given syntax kind.
pub const fn contains(&self, kind: SyntaxKind) -> bool {
(self.0 & bit(kind)) != 0
}
}
const fn bit(kind: SyntaxKind) -> u128 {
1 << (kind as usize)
}
/// Syntax kinds that can start a statement.
pub const STMT: SyntaxSet = SyntaxSet::new(&[
SyntaxKind::Let,
SyntaxKind::Set,
SyntaxKind::Show,
SyntaxKind::Import,
SyntaxKind::Include,
SyntaxKind::Return,
]);
/// Syntax kinds that can start a markup expression.
pub const MARKUP_EXPR: SyntaxSet = SyntaxSet::new(&[
SyntaxKind::Space,
SyntaxKind::Parbreak,
SyntaxKind::LineComment,
SyntaxKind::BlockComment,
SyntaxKind::Text,
SyntaxKind::Linebreak,
SyntaxKind::Escape,
SyntaxKind::Shorthand,
SyntaxKind::SmartQuote,
SyntaxKind::Raw,
SyntaxKind::Link,
SyntaxKind::Label,
SyntaxKind::Hash,
SyntaxKind::Star,
SyntaxKind::Underscore,
SyntaxKind::HeadingMarker,
SyntaxKind::ListMarker,
SyntaxKind::EnumMarker,
SyntaxKind::TermMarker,
SyntaxKind::RefMarker,
SyntaxKind::Dollar,
SyntaxKind::LeftBracket,
SyntaxKind::RightBracket,
SyntaxKind::Colon,
]);
/// Syntax kinds that can start a math expression.
pub const MATH_EXPR: SyntaxSet = SyntaxSet::new(&[
SyntaxKind::Hash,
SyntaxKind::MathIdent,
SyntaxKind::Text,
SyntaxKind::Shorthand,
SyntaxKind::Linebreak,
SyntaxKind::MathAlignPoint,
SyntaxKind::Escape,
SyntaxKind::Str,
SyntaxKind::Root,
SyntaxKind::Prime,
]);
/// Syntax kinds that can start a code expression.
pub const CODE_EXPR: SyntaxSet = CODE_PRIMARY.union(UNARY_OP);
/// Syntax kinds that can start an atomic code expression.
pub const ATOMIC_CODE_EXPR: SyntaxSet = ATOMIC_CODE_PRIMARY;
/// Syntax kinds that can start a code primary.
pub const CODE_PRIMARY: SyntaxSet =
ATOMIC_CODE_PRIMARY.union(SyntaxSet::new(&[SyntaxKind::Underscore]));
/// Syntax kinds that can start an atomic code primary.
pub const ATOMIC_CODE_PRIMARY: SyntaxSet = SyntaxSet::new(&[
SyntaxKind::Ident,
SyntaxKind::LeftBrace,
SyntaxKind::LeftBracket,
SyntaxKind::LeftParen,
SyntaxKind::Dollar,
SyntaxKind::Let,
SyntaxKind::Set,
SyntaxKind::Show,
SyntaxKind::If,
SyntaxKind::While,
SyntaxKind::For,
SyntaxKind::Import,
SyntaxKind::Include,
SyntaxKind::Break,
SyntaxKind::Continue,
SyntaxKind::Return,
SyntaxKind::None,
SyntaxKind::Auto,
SyntaxKind::Int,
SyntaxKind::Float,
SyntaxKind::Bool,
SyntaxKind::Numeric,
SyntaxKind::Str,
SyntaxKind::Label,
SyntaxKind::Raw,
]);
/// Syntax kinds that are unary operators.
pub const UNARY_OP: SyntaxSet =
SyntaxSet::new(&[SyntaxKind::Plus, SyntaxKind::Minus, SyntaxKind::Not]);
/// Syntax kinds that are binary operators.
pub const BINARY_OP: SyntaxSet = SyntaxSet::new(&[
SyntaxKind::Plus,
SyntaxKind::Minus,
SyntaxKind::Star,
SyntaxKind::Slash,
SyntaxKind::And,
SyntaxKind::Or,
SyntaxKind::EqEq,
SyntaxKind::ExclEq,
SyntaxKind::Lt,
SyntaxKind::LtEq,
SyntaxKind::Gt,
SyntaxKind::GtEq,
SyntaxKind::Eq,
SyntaxKind::In,
SyntaxKind::PlusEq,
SyntaxKind::HyphEq,
SyntaxKind::StarEq,
SyntaxKind::SlashEq,
]);
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_size() {
assert!((SyntaxKind::Eof as usize) < 128);
}
#[test]
fn test_set() {
let set = SyntaxSet::new(&[SyntaxKind::And, SyntaxKind::Or]);
assert!(set.contains(SyntaxKind::And));
assert!(set.contains(SyntaxKind::Or));
assert!(!set.contains(SyntaxKind::Not));
}
}
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