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pub use crate::value::{Dependency, FunctionalLinearity, Linearity, Relationship, Usage, Variance};
use num::BigUint;
use smallvec::SmallVec;
use std::sync::Arc;
mod instant;
mod param;
pub use instant::*;
pub use param::*;
#[derive(Debug, Clone, Eq, PartialEq)]
pub enum Expr {
Ident(String),
Hole,
Sexpr(Sexpr),
Lambda(Lambda),
Pi(Pi),
Universe(u64),
Lifetime(Option<Constraints>),
Empty,
Unit,
Natural(BigUint),
Nat,
Boolean(bool),
Bool,
Scope(Scope),
TypeOf(Arc<Expr>),
}
impl Expr {
pub fn ident_str<S: Into<String> + PartialEq<&'static str>>(ident: S) -> Option<String> {
if ident.eq(&"_") {
None
} else {
Some(ident.into())
}
}
pub fn ident<S: Into<String> + PartialEq<&'static str>>(ident: S) -> Expr {
if let Some(ident) = Expr::ident_str(ident) {
Expr::Ident(ident)
} else {
Expr::Hole
}
}
}
impl<'a> From<&'a str> for Expr {
fn from(s: &'a str) -> Expr {
Expr::ident(s)
}
}
impl From<String> for Expr {
fn from(s: String) -> Expr {
Expr::ident(s)
}
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub enum Statement {
Instant(Instant),
Param(Param),
Let(Let),
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Let {
pub name: String,
pub judgement: Option<Judgement>,
pub value: Arc<Expr>,
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Judgement {
pub variance: Variance,
pub strict: bool,
pub ty: Arc<Expr>,
}
pub const SMALL_SEXPR_SIZE: usize = 2;
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Sexpr(pub SmallVec<[Arc<Expr>; SMALL_SEXPR_SIZE]>);
#[derive(Debug, Clone, Eq, PartialEq)]
pub struct Scope {
pub statements: Vec<Statement>,
pub result: Arc<Expr>,
}