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// Copyright (c) 2017 Fabian Schuiki

use value::*;
use ty::*;

/// A function argument or process/entity input or output.
pub struct Argument {
	id: ArgumentRef,
	ty: Type,
	name: Option<String>,
}

impl Argument {
	/// Create a new argument of the given type.
	pub fn new(ty: Type) -> Argument {
		Argument {
			id: ArgumentRef::new(ValueId::alloc()),
			ty: ty,
			name: None,
		}
	}

	/// Obtain a reference to this argument.
	pub fn as_ref(&self) -> ArgumentRef {
		self.id
	}

	/// Set the name of the argument.
	pub fn set_name<S: Into<String>>(&mut self, name: S) {
		self.name = Some(name.into());
	}
}

impl Value for Argument {
	fn id(&self) -> ValueId {
		self.id.into()
	}

	fn ty(&self) -> Type {
		self.ty.clone()
	}

	fn name(&self) -> Option<&str> {
		self.name.as_ref().map(|x| x as &str)
	}

	fn is_global(&self) -> bool {
		false
	}
}