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#[derive(Debug)]
pub struct WithLocation<T> {
value: T,
location: (usize, usize),
}
impl<T> WithLocation<T> {
pub fn new(value: T, start: usize, end: usize) -> WithLocation<T> {
WithLocation {
value: value,
location: (start, end),
}
}
pub fn map<U, F: FnOnce(T) -> U>(self, f: F) -> WithLocation<U> {
WithLocation {
value: f(self.value),
location: self.location,
}
}
pub fn join_map<U, V, F>(self, other: WithLocation<U>, f: F) -> WithLocation<V>
where F: FnOnce(WithLocation<T>, WithLocation<U>) -> V
{
let loc1 = self.location;
let loc2 = other.location;
WithLocation {
value: f(self, other),
location: (loc1.0, loc2.1),
}
}
}
#[derive(Debug)]
pub struct Program(pub Box<WithLocation<Expression>>);
#[derive(Debug)]
pub enum BinOp {
Add,
Sub,
Mul,
Div,
FloorDiv,
}
#[derive(Debug)]
pub enum Expression {
BinOp(BinOp, Box<WithLocation<Expression>>, Box<WithLocation<Expression>>),
Number(u64),
Nil,
}
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