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use std::ops;
use crate::SyntaxKind;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct TokenSet(u128);
impl TokenSet {
#[allow(dead_code)]
pub(crate) const EMPTY: TokenSet = TokenSet(0);
pub(crate) const fn new(kind: SyntaxKind) -> TokenSet {
TokenSet(mask(kind))
}
pub(crate) const fn from_slice(kinds: &[SyntaxKind]) -> TokenSet {
let mut res = 0u128;
let mut i = 0;
while i < kinds.len() {
res |= mask(kinds[i]);
i += 1
}
TokenSet(res)
}
pub(crate) const fn union(self, other: TokenSet) -> TokenSet {
TokenSet(self.0 | other.0)
}
pub(crate) const fn contains(&self, kind: SyntaxKind) -> bool {
self.0 & mask(kind) != 0
}
}
const fn mask(kind: SyntaxKind) -> u128 {
1u128 << (kind as usize)
}
impl ops::BitOr for SyntaxKind {
type Output = TokenSet;
fn bitor(self, rhs: Self) -> Self::Output {
TokenSet(mask(self) | mask(rhs))
}
}
impl ops::BitOr<SyntaxKind> for TokenSet {
type Output = TokenSet;
fn bitor(self, rhs: SyntaxKind) -> Self::Output {
self.union(TokenSet(mask(rhs)))
}
}
impl ops::BitOr<TokenSet> for SyntaxKind {
type Output = TokenSet;
fn bitor(self, rhs: TokenSet) -> Self::Output {
TokenSet(mask(self)).union(rhs)
}
}
impl ops::BitOr<TokenSet> for TokenSet {
type Output = TokenSet;
fn bitor(self, rhs: TokenSet) -> Self::Output {
self.union(rhs)
}
}
impl ops::BitOr<SyntaxKind> for () {
type Output = TokenSet;
fn bitor(self, rhs: SyntaxKind) -> Self::Output {
TokenSet::new(rhs)
}
}
impl ops::BitOr<()> for SyntaxKind {
type Output = TokenSet;
fn bitor(self, (): ()) -> Self::Output {
TokenSet::new(self)
}
}