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//! Do type conversion on a lowered `Expr` at runtime

use super::*;

use crate::value::ValueType;

/// Do type conversion on a lowered `Expr` at runtime
#[derive(Clone, Debug)]
pub struct Conv {
    ty: ValueType,
    expr: Box<Expr>,
}

impl Conv {
    fn new(ty: ValueType, expr: Expr) -> Self {
        Self {
            ty,
            expr: Box::new(expr),
        }
    }

    pub fn to_bool<T>(expr: T) -> Self
    where
        T: Into<Expr>,
    {
        Self::new(ValueType::Bool, expr.into())
    }

    pub fn to_float<T>(expr: T) -> Self
    where
        T: Into<Expr>,
    {
        Self::new(ValueType::Float, expr.into())
    }

    pub fn to_integer<T>(expr: T) -> Self
    where
        T: Into<Expr>,
    {
        Self::new(ValueType::Int, expr.into())
    }

    pub fn to_str<T>(expr: T) -> Self
    where
        T: Into<Expr>,
    {
        Self::new(ValueType::Str, expr.into())
    }
}

impl HirLowering for Conv {
    fn lower<'hir, 'lir>(&'hir self, runtime: &mut HirLoweringRuntime<'lir>)
    where
        'hir: 'lir,
    {
        self.expr.lower(runtime);
        runtime.emit(LirElement::conv(self.ty.clone()));
    }
}