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use std::rc::Rc;
/// A location in the source text
#[derive(Debug, Clone)]
pub struct ParsedSpan {
input: Rc<str>,
/// # Safety
///
/// Must be a valid character boundary index into `input`.
start: usize,
/// # Safety
///
/// Must be a valid character boundary index into `input`.
end: usize,
}
#[derive(Debug, Clone)]
pub enum Span {
/// A location in the source text
Parsed(ParsedSpan),
/// For expressions obtained from decoding binary
Decoded,
/// For expressions constructed during normalization/typecheck
Artificial,
/// For when there should be a span but it's not done yet
/// TODO: properly handle spans
PlaceHolder,
}
impl Span {
pub(crate) fn make(input: Rc<str>, sp: pest::Span) -> Self {
Span::Parsed(ParsedSpan {
input,
start: sp.start(),
end: sp.end(),
})
}
/// Takes the union of the two spans. Assumes that the spans come from the same input.
/// This will also capture any input between the spans.
pub fn union(&self, other: &Span) -> Self {
use std::cmp::{max, min};
use Span::*;
match (self, other) {
(Parsed(x), Parsed(y)) => Parsed(ParsedSpan {
input: x.input.clone(),
start: min(x.start, y.start),
end: max(x.end, y.end),
}),
_ => panic!(
"Tried to union incompatible spans: {:?} and {:?}",
self, other
),
}
}
}
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