use super::types::Type;

/// ID of a definition (e.g. variable, block, function)
#[derive(Debug, Clone, Copy)]
pub struct DefId(pub u32);
#[derive(Debug, Clone, Copy)]
pub struct ExprId(pub u32);

/// an abstract element that performs some kind of computation on inputs
#[derive(Debug, Clone)]
pub struct Expr {
    pub id: ExprId,
    pub kind: ExprKind,
    pub typ: Type,
}

#[derive(Debug, Clone)]
pub enum ExprKind {
    Literal,
    Path(DefId),
    Call { called: DefId, args: Vec<Expr> },
}

#[derive(Debug, Clone)]
pub struct Signal {
    pub id: DefId,
    pub typ: Type,
}

/// A block of HDL code, e.g. comb block
#[derive(Debug, Clone)]
pub struct Block {
    pub signals: Vec<Signal>,
    pub expr: Expr,
}