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#[derive(Debug)]
pub struct WithLocation<T> {
pub value: T,
pub start: usize,
pub end: usize,
}
impl<T> WithLocation<T> {
pub fn new(value: T, start: usize, end: usize) -> WithLocation<T> {
WithLocation {
value: value,
start: start,
end: end,
}
}
pub fn map<U, F: FnOnce(T) -> U>(self, f: F) -> WithLocation<U> {
WithLocation {
value: f(self.value),
start: self.start,
end: self.end,
}
}
pub fn join_map<U, V, F>(self, other: WithLocation<U>, f: F) -> WithLocation<V>
where F: FnOnce(WithLocation<T>, WithLocation<U>) -> V
{
let start = self.start;
let end = other.end;
WithLocation {
value: f(self, other),
start: start,
end: end,
}
}
}
#[derive(Debug)]
pub struct Program(pub Box<WithLocation<Expression>>);
#[derive(Debug)]
pub enum UnaryOp {
Pos,
Neg,
Not,
}
#[derive(Debug)]
pub enum BinOp {
Add,
Sub,
Mul,
Div,
FloorDiv,
Eq,
Neq,
Gt,
Lt,
Ge,
Le,
And,
Or,
}
#[derive(Debug)]
pub enum Expression {
Let(Vec<WithLocation<VarDec>>, Box<WithLocation<Expression>>),
UnaryOp(UnaryOp, Box<WithLocation<Expression>>),
BinOp(BinOp, Box<WithLocation<Expression>>, Box<WithLocation<Expression>>),
Number(u64),
String(String),
Name(String),
Nil,
}
#[derive(Debug)]
pub struct VarDec {
pub name: WithLocation<String>,
pub type_: Option<String>,
pub value: Box<WithLocation<Expression>>,
}
impl VarDec {
pub fn new(name: WithLocation<String>, type_: Option<String>,
value: Box<WithLocation<Expression>>) -> VarDec {
VarDec {
name: name,
type_: type_,
value: value,
}
}
}
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