use miette::Diagnostic;
use thiserror::Error;

use crate::{diagnostics::AstDiagnostic, parse::Attribute, tokenize::Span};

#[derive(Error, Debug, Diagnostic)]
#[error("Stray equal sign found not attached to any attributes")]
#[diagnostic(code(StrayEqualSign), severity(Error))]
pub struct StrayEqualSign {
	#[label(primary, "An equal sign is not a valid attribute")]
	token: Span,
}

impl AstDiagnostic for StrayEqualSign {
	fn handle_attribute(attribute: &crate::parse::Attribute<'_>) -> Option<Self> {
		let Attribute::StrayEqualSign(token) = attribute else {
			return None;
		};

		Some(Self { token: token.span })
	}
}