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use std::convert::TryFrom;
use std::fmt::{self, Display};
use std::ops::{Add, Div, Mul, Neg, Sub};
use std::rc::Rc;
use derive_more::{Deref, From, TryInto};
use super::{Error, Result};
use crate::ast::Type;
#[derive(Debug, PartialEq, From, TryInto)]
#[try_into(owned, ref)]
pub enum Val {
Int(i64),
Float(f64),
Bool(bool),
}
impl From<u64> for Val {
fn from(i: u64) -> Self {
Self::from(i as i64)
}
}
impl Display for Val {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Val::Int(x) => x.fmt(f),
Val::Float(x) => x.fmt(f),
Val::Bool(x) => x.fmt(f),
}
}
}
impl Val {
pub fn type_(&self) -> Type {
match self {
Val::Int(_) => Type::Int,
Val::Float(_) => Type::Float,
Val::Bool(_) => Type::Bool,
}
}
pub fn into_type<'a, T>(&'a self) -> Result<&'a T>
where
T: TypeOf + 'a + Clone,
&'a T: TryFrom<&'a Self>,
{
<&T>::try_from(self).map_err(|_| Error::InvalidType {
actual: self.type_(),
expected: <T as TypeOf>::type_of(),
})
}
}
#[derive(Debug, PartialEq, Clone, Deref)]
pub struct Value(Rc<Val>);
impl Display for Value {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl<T> From<T> for Value
where
Val: From<T>,
{
fn from(x: T) -> Self {
Self(Rc::new(x.into()))
}
}
impl Neg for Value {
type Output = Result<Value>;
fn neg(self) -> Self::Output {
Ok((-self.into_type::<i64>()?).into())
}
}
impl Add for Value {
type Output = Result<Value>;
fn add(self, rhs: Self) -> Self::Output {
Ok((self.into_type::<i64>()? + rhs.into_type::<i64>()?).into())
}
}
impl Sub for Value {
type Output = Result<Value>;
fn sub(self, rhs: Self) -> Self::Output {
Ok((self.into_type::<i64>()? - rhs.into_type::<i64>()?).into())
}
}
impl Mul for Value {
type Output = Result<Value>;
fn mul(self, rhs: Self) -> Self::Output {
Ok((self.into_type::<i64>()? * rhs.into_type::<i64>()?).into())
}
}
impl Div for Value {
type Output = Result<Value>;
fn div(self, rhs: Self) -> Self::Output {
Ok((self.into_type::<f64>()? / rhs.into_type::<f64>()?).into())
}
}
pub trait TypeOf {
fn type_of() -> Type;
}
impl TypeOf for i64 {
fn type_of() -> Type {
Type::Int
}
}
impl TypeOf for bool {
fn type_of() -> Type {
Type::Bool
}
}
impl TypeOf for f64 {
fn type_of() -> Type {
Type::Float
}
}
|
