Macro rdf_parser

macro_rules! rdf_parser {
    (
   $(#[$attr:meta])*
   $fn_vis: vis fn $name: ident [$($type_params: tt)*]( $($arg: ident :  $arg_type: ty),*)
     ($input_type: ty) -> $output_type: ty
   where [$($where_clause: tt)*]
     $parser: block
 ) => { ... };
}

Declares a named RDF parser which can be reused.

The expression which creates the parser should have no side effects as it may be called multiple times even during a single parse attempt.

This macro is useful when declaring mutually recursive parsers

#[macro_use]
use iri_s::IriS;
use srdf::{rdf_parser, RDFParser, RDF, RDFFormat, FocusRDF, satisfy, ReaderMode, RDFNodeParse, SRDF, SRDFBasic, property_value, rdf_list, set_focus, parse_property_value_as_list};
use srdf::srdf_graph::SRDFGraph;

rdf_parser!{
      fn is_term['a, RDF](term: &'a RDF::Term)(RDF) -> ()
      where [
      ] {
       let name = format!("is_{term}");
       satisfy(|t| { t == *term }, name.as_str())
      }
}

let s = r#"prefix : <http://example.org/>
           :x :p 1.
"#;
let mut graph = SRDFGraph::from_str(s, &RDFFormat::Turtle, None, &ReaderMode::default()).unwrap();
let x = IriS::new_unchecked("http://example.org/x");
let term = <SRDFGraph as SRDFBasic>::iri_s2term(&x);
assert_eq!(is_term(&term).parse(&x, graph).unwrap(), ())