pub type Ident = String;

#[derive(Debug, Clone)]
pub enum Statement {
	Assign {
		target: Location,
		source: Box<Expression>,
	},
	Call {
		callee: Ident,
		args: Vec<Expression>,
	},
	Local {
		name: Ident,
		init: Option<Box<Expression>>,
	},
}

#[derive(Debug, Clone)]
pub enum Location {
	Variable {
		name: Ident,
	},
	Field {
		table: Box<Location>,
		index: Box<Expression>,
	},
}

#[derive(Debug, Clone)]
pub enum Expression {
	Constant(Constant),
	Variable(Location),
	Call {
		callee: Ident,
		args: Vec<Expression>,
	},
	Function(Function),
}

#[derive(Debug, Clone, Default)]
pub struct Function {
	pub name: Option<Ident>,
	pub args: Vec<Ident>,
	pub body: Vec<Statement>,
	pub ret: Option<Box<Expression>>,
}

#[derive(Debug, Clone, Default)]
pub enum Constant {
	#[default]
	Nil,
	Boolean(bool),
	Number(i64),
	String(String),
}