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use std::borrow::Cow;
use std::convert::TryFrom;
use std::fmt::{self, Display};
use std::ops::{Add, Div, Mul, Neg, Sub};
use std::rc::Rc;
use std::result;
use derive_more::{Deref, From, TryInto};
use super::{Error, Result};
use crate::ast::hir::Expr;
use crate::ast::{FunctionType, Ident, Type};
#[derive(Debug, Clone)]
pub struct Function<'a> {
pub type_: FunctionType<'a>,
pub args: Vec<Ident<'a>>,
pub body: Expr<'a, Type<'a>>,
}
#[derive(From, TryInto)]
#[try_into(owned, ref)]
pub enum Val<'a> {
Int(i64),
Float(f64),
Bool(bool),
String(Cow<'a, str>),
Function(Function<'a>),
}
impl<'a> TryFrom<Val<'a>> for String {
type Error = ();
fn try_from(value: Val<'a>) -> result::Result<Self, Self::Error> {
match value {
Val::String(s) => Ok(s.into_owned()),
_ => Err(()),
}
}
}
impl<'a> fmt::Debug for Val<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
Val::Int(x) => f.debug_tuple("Int").field(x).finish(),
Val::Float(x) => f.debug_tuple("Float").field(x).finish(),
Val::Bool(x) => f.debug_tuple("Bool").field(x).finish(),
Val::String(s) => f.debug_tuple("String").field(s).finish(),
Val::Function(Function { type_, .. }) => {
f.debug_struct("Function").field("type_", type_).finish()
}
}
}
}
impl<'a> PartialEq for Val<'a> {
fn eq(&self, other: &Self) -> bool {
match (self, other) {
(Val::Int(x), Val::Int(y)) => x == y,
(Val::Float(x), Val::Float(y)) => x == y,
(Val::Bool(x), Val::Bool(y)) => x == y,
(Val::Function(_), Val::Function(_)) => false,
(_, _) => false,
}
}
}
impl<'a> From<u64> for Val<'a> {
fn from(i: u64) -> Self {
Self::from(i as i64)
}
}
impl<'a> Display for Val<'a> {
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),
Val::String(s) => write!(f, "{:?}", s),
Val::Function(Function { type_, .. }) => write!(f, "<{}>", type_),
}
}
}
impl<'a> Val<'a> {
pub fn type_(&self) -> Type {
match self {
Val::Int(_) => Type::Int,
Val::Float(_) => Type::Float,
Val::Bool(_) => Type::Bool,
Val::String(_) => Type::CString,
Val::Function(Function { type_, .. }) => Type::Function(type_.clone()),
}
}
pub fn as_type<'b, T>(&'b self) -> Result<&'b T>
where
T: TypeOf + 'b + Clone,
&'b T: TryFrom<&'b Self>,
{
<&T>::try_from(self).map_err(|_| Error::InvalidType {
actual: self.type_().to_owned(),
expected: <T as TypeOf>::type_of(),
})
}
pub fn as_function<'b>(&'b self, function_type: FunctionType) -> Result<&'b Function<'a>> {
match self {
Val::Function(f) if f.type_ == function_type => Ok(&f),
_ => Err(Error::InvalidType {
actual: self.type_().to_owned(),
expected: Type::Function(function_type.to_owned()),
}),
}
}
}
#[derive(Debug, PartialEq, Clone, Deref)]
pub struct Value<'a>(Rc<Val<'a>>);
impl<'a> Display for Value<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(f)
}
}
impl<'a, T> From<T> for Value<'a>
where
Val<'a>: From<T>,
{
fn from(x: T) -> Self {
Self(Rc::new(x.into()))
}
}
impl<'a> Neg for Value<'a> {
type Output = Result<Value<'a>>;
fn neg(self) -> Self::Output {
Ok((-self.as_type::<i64>()?).into())
}
}
impl<'a> Add for Value<'a> {
type Output = Result<Value<'a>>;
fn add(self, rhs: Self) -> Self::Output {
Ok((self.as_type::<i64>()? + rhs.as_type::<i64>()?).into())
}
}
impl<'a> Sub for Value<'a> {
type Output = Result<Value<'a>>;
fn sub(self, rhs: Self) -> Self::Output {
Ok((self.as_type::<i64>()? - rhs.as_type::<i64>()?).into())
}
}
impl<'a> Mul for Value<'a> {
type Output = Result<Value<'a>>;
fn mul(self, rhs: Self) -> Self::Output {
Ok((self.as_type::<i64>()? * rhs.as_type::<i64>()?).into())
}
}
impl<'a> Div for Value<'a> {
type Output = Result<Value<'a>>;
fn div(self, rhs: Self) -> Self::Output {
Ok((self.as_type::<f64>()? / rhs.as_type::<f64>()?).into())
}
}
pub trait TypeOf {
fn type_of() -> Type<'static>;
}
impl TypeOf for i64 {
fn type_of() -> Type<'static> {
Type::Int
}
}
impl TypeOf for bool {
fn type_of() -> Type<'static> {
Type::Bool
}
}
impl TypeOf for f64 {
fn type_of() -> Type<'static> {
Type::Float
}
}
impl TypeOf for String {
fn type_of() -> Type<'static> {
Type::CString
}
}
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