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use crate::parse::ast::nodes::FnNode;
use anyhow::{anyhow, Result};
use std::{cell::RefCell, fmt::Display, rc::Rc};
type Ref<T> = RefCell<Rc<T>>;
#[derive(Clone, Debug)]
pub enum Value {
Str(String),
Float(f64),
Int(i64),
Bool(bool),
Fn(Ref<FnNode>),
Void,
}
impl Value {
pub fn add(self, rhs: Value) -> Result<Value> {
match self {
Value::Str(l) => match rhs {
Value::Str(r) => Ok(Value::Str(l + &r)),
Value::Float(r) => Ok(Value::Str(l + &r.to_string())),
Value::Int(r) => Ok(Value::Str(l + &r.to_string())),
_ => Err(anyhow!("Right operand can't be added.")),
},
Value::Float(l) => match rhs {
Value::Str(r) => Ok(Value::Str(l.to_string() + &r)),
Value::Float(r) => Ok(Value::Float(l + r)),
Value::Int(r) => Ok(Value::Float(l + r as f64)),
_ => Err(anyhow!("Right operand can't be added.")),
},
Value::Int(l) => match rhs {
Value::Str(r) => Ok(Value::Str(l.to_string() + &r)),
Value::Float(r) => Ok(Value::Float(l as f64 + r)),
Value::Int(r) => Ok(Value::Int(l + r)),
_ => Err(anyhow!("Right operand can't be added.")),
},
_ => Err(anyhow!("Left operand can't be added.")),
}
}
pub fn sub(self, rhs: Value) -> Result<Value> {
match self {
Value::Float(l) => match rhs {
Value::Float(r) => Ok(Value::Float(l - r)),
Value::Int(r) => Ok(Value::Float(l - r as f64)),
_ => Err(anyhow!("Right operand can't be substracted.")),
},
Value::Int(l) => match rhs {
Value::Float(r) => Ok(Value::Float(l as f64 - r)),
Value::Int(r) => Ok(Value::Int(l - r)),
_ => Err(anyhow!("Right operand can't be substracted.")),
},
_ => Err(anyhow!("Left operand can't be substracted from.")),
}
}
pub fn mul(self, rhs: Value) -> Result<Value> {
match self {
Value::Float(l) => match rhs {
Value::Float(r) => Ok(Value::Float(l * r)),
Value::Int(r) => Ok(Value::Float(l * r as f64)),
_ => Err(anyhow!("Right operand can't be multiplied.")),
},
Value::Int(l) => match rhs {
Value::Float(r) => Ok(Value::Float(l as f64 * r)),
Value::Int(r) => Ok(Value::Int(l * r)),
_ => Err(anyhow!("Right operand can't be multiplied.")),
},
_ => Err(anyhow!("Left operand can't be multiplied.")),
}
}
pub fn div(self, rhs: Value) -> Result<Value> {
match self {
Value::Float(l) => match rhs {
Value::Float(r) => Ok(Value::Float(l / r)),
Value::Int(r) => Ok(Value::Float(l / r as f64)),
_ => Err(anyhow!("Right operand can't be multiplied.")),
},
Value::Int(l) => match rhs {
Value::Float(r) => Ok(Value::Float(l as f64 / r)),
Value::Int(r) => Ok(Value::Float(l as f64 / r as f64)),
_ => Err(anyhow!("Right operand can't be multiplied.")),
},
_ => Err(anyhow!("Left operand can't be multiplied.")),
}
}
pub fn eq(self, rhs: Value) -> Result<Value> {
match self {
Value::Str(l) => match rhs {
Value::Str(r) => Ok(Value::Bool(l == r)),
_ => Ok(Value::Bool(false)),
},
Value::Float(l) => match rhs {
Value::Float(r) => Ok(Value::Bool(l == r)),
_ => Ok(Value::Bool(false)),
},
Value::Int(l) => match rhs {
Value::Int(r) => Ok(Value::Bool(l == r)),
_ => Ok(Value::Bool(false)),
},
Value::Bool(l) => match rhs {
Value::Bool(r) => Ok(Value::Bool(l == r)),
_ => Ok(Value::Bool(false)),
},
_ => Ok(Value::Bool(false)),
}
}
pub fn neq(self, rhs: Value) -> Result<Value> {
if let Ok(Value::Bool(value)) = self.eq(rhs) {
Ok(Value::Bool(!value))
} else {
unreachable!()
}
}
pub fn gt(self, rhs: Value) -> Result<Value> {
match self {
Value::Float(r) => match rhs {
Value::Float(l) => Ok(Value::Bool(r > l)),
Value::Int(l) => Ok(Value::Bool(r > l as f64)),
_ => Err(anyhow!("Right operand can't be compared.")),
},
Value::Int(r) => match rhs {
Value::Float(l) => Ok(Value::Bool(r as f64 > l)),
Value::Int(l) => Ok(Value::Bool(r > l)),
_ => Err(anyhow!("Right operand can't be compared.")),
},
_ => Err(anyhow!("Left operand can't be compared.")),
}
}
pub fn gte(self, rhs: Value) -> Result<Value> {
match self {
Value::Float(r) => match rhs {
Value::Float(l) => Ok(Value::Bool(r >= l)),
Value::Int(l) => Ok(Value::Bool(r >= l as f64)),
_ => Err(anyhow!("Right operand can't be compared.")),
},
Value::Int(r) => match rhs {
Value::Float(l) => Ok(Value::Bool(r as f64 >= l)),
Value::Int(l) => Ok(Value::Bool(r >= l)),
_ => Err(anyhow!("Right operand can't be compared.")),
},
_ => Err(anyhow!("Left operand can't be compared.")),
}
}
}
impl Display for Value {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
match self {
Value::Str(v) => write!(f, "{}", v),
Value::Float(v) => write!(f, "{}", v),
Value::Int(v) => write!(f, "{}", v),
Value::Bool(v) => write!(f, "{}", v),
Value::Fn(v) => write!(f, "<fn {:?}>", v.as_ptr()),
Value::Void => write!(f, "<void>"),
}
}
}
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