rdf-syntax 1.0.0

use std::fmt;

use iref::{Iri, IriBuf};

use crate::{Id, IdRef, Quad, RdfDisplay, Term, TermRef};

/// Lexical RDF quad.
pub type RdfQuad = Quad<Id, IriBuf, Term, Id>;

/// Lexical RDF quad reference.
pub type RdfQuadRef<'a> = Quad<IdRef<'a>, &'a Iri, TermRef<'a>, IdRef<'a>>;

/// gRDF quad.
pub type GrdfQuad = Quad<Term>;

/// gRDF quad reference.
pub type GrdfQuadRef<'a> = Quad<TermRef<'a>>;

impl<S: RdfDisplay, P: RdfDisplay, O: RdfDisplay, G: RdfDisplay> RdfDisplay for Quad<S, P, O, G> {
	fn rdf_fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		match self.graph() {
			Some(graph) => write!(
				f,
				"{} {} {} {}",
				self.0.rdf_display(),
				self.1.rdf_display(),
				self.2.rdf_display(),
				graph.rdf_display()
			),
			None => write!(
				f,
				"{} {} {}",
				self.0.rdf_display(),
				self.1.rdf_display(),
				self.2.rdf_display()
			),
		}
	}
}