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pub mod util;
pub mod display;
pub mod check;
use crate::sexp::SExp;
#[derive(Clone,Debug,PartialEq)]
pub enum Type {
Integer,
Arrow(Box<Type>, Box<Type>),
List(Vec<Type>),
/// Type for generics
/// and also error messages
/// with unknown types
VarType(String),
}
#[derive(Debug,PartialEq)]
pub enum TypeError {
UndefinedVariable(String),
UnboundGeneric(String),
InvalidOperator {
operator: SExp,
expected: Type,
found: Type,
},
InvalidArgList {
arglist: SExp,
expected: Type,
found: Type,
},
OtherError
}
impl Type {
/// Tests if the type has no variable types.
///
/// **Examples**
/// ```rust
/// use melisp::r#type::{*, Type::*, TypeError::*, util::*};
///
/// assert!(Integer.is_concrete());
/// assert!(!VarType("a".to_string()).is_concrete());
///
/// assert!(arr(Integer, Integer).is_concrete());
/// assert!(!arr(VarType("b".to_string()), Integer).is_concrete());
///
/// assert!(
/// List(vec![Integer, Integer, arr(Integer, Integer)]).is_concrete()
/// );
/// assert!(
/// !List(vec![Integer, VarType("a".to_string()), Integer])
/// .is_concrete()
/// );
/// ```
pub fn is_concrete(&self) -> bool {
todo!()
}
}
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