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use std::sync::atomic::AtomicU32;
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct FileId {
id: u32,
}
impl FileId {
pub fn new() -> Self {
static GEN: AtomicU32 = AtomicU32::new(0);
Self {
id: GEN.fetch_add(1, std::sync::atomic::Ordering::SeqCst),
}
}
pub fn from(self, start: u32) -> SpanFrom {
SpanFrom::new(self, start)
}
pub fn span(self, start: u32, end: u32) -> Span {
Span::new(self, start, end)
}
}
#[derive(Copy, Clone)]
pub struct SpanFrom {
pub file: FileId,
pub start: u32,
}
impl SpanFrom {
pub fn new(file: FileId, start: u32) -> Self {
Self { file, start }
}
pub fn to(self, end: u32) -> Span {
Span::new(self.file, self.start, end)
}
pub fn with_len(self, len: u32) -> Span {
self.to(self.start + len)
}
}
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Span {
pub file: FileId,
pub start: u32,
pub end: u32,
}
/// manual implementation of PartialOrd to ensure shorter Spans are first
impl PartialOrd for Span {
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
match self.file.partial_cmp(&other.file) {
Some(core::cmp::Ordering::Equal) => {}
ord => return ord,
}
match self.start.partial_cmp(&other.start) {
Some(core::cmp::Ordering::Equal) => {}
ord => return ord,
}
other.end.partial_cmp(&self.end)
}
}
/// manual implementation of Ord to ensure shorter Spans are first
impl Ord for Span {
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
match self.file.cmp(&other.file) {
core::cmp::Ordering::Equal => {}
ord => return ord,
}
match self.start.cmp(&other.start) {
core::cmp::Ordering::Equal => {}
ord => return ord,
}
other.end.cmp(&self.end)
}
}
impl Span {
pub fn new(file: FileId, start: u32, end: u32) -> Self {
Self { file, start, end }
}
}
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