use std::fmt::{Display, Error, Formatter};
use std::ops::Add;
#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash, Default)]
pub struct Loc {
pub start: usize,
pub line: usize,
pub end: usize,
pub is_generated: bool,
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Ident {
pub loc: Loc,
pub text: String,
}
impl Ident {
pub fn new(loc: Loc, text: String) -> Self {
Self { loc, text }
}
}
impl ToLoc for Ident {
fn loc(&self) -> Loc {
self.loc
}
}
pub fn merge_info(a: &impl ToLoc, b: &impl ToLoc) -> Loc {
a.loc() + b.loc()
}
pub trait ToLoc {
fn loc(&self) -> Loc;
}
impl Add for Loc {
type Output = Self;
#[allow(clippy::suspicious_arithmetic_impl)]
fn add(self, rhs: Self) -> Self::Output {
Self::Output {
line: self.line,
start: self.start,
end: rhs.end,
is_generated: self.is_generated || rhs.is_generated,
}
}
}
impl Display for Loc {
fn fmt(&self, f: &mut Formatter) -> Result<(), Error> {
write!(f, "line {:?} ({:?}:{:?})", self.line, self.start, self.end)
}
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Labelled<Expr> {
pub label: Ident,
pub expr: Expr,
}
impl<Expr> Labelled<Expr> {
pub fn new(label: Ident, expr: Expr) -> Self {
Self { label, expr }
}
pub fn map_expr<Abs>(self, f: impl FnOnce(Expr) -> Abs) -> Labelled<Abs> {
Labelled {
label: self.label,
expr: f(self.expr),
}
}
}