Implementation of N-Triples, N-Quads, Turtle and TriG parsers.
RDF-star syntaxes are also supported, i.e. Turtle-star, TriG-star, N-Triples-star and N-Quads-star.
All the provided parsers work in streaming from a BufRead
implementation.
They do not rely on any dependencies outside of Rust standard library.
The parsers are not protected against memory overflows.
For example if the parsed content contains a literal string of 16 GB, 16 GB of memory will be allocated.
How to read a file foo.ttl
and count the number of rdf:type
triples:
use rio_turtle::{TurtleParser, TurtleError};
use rio_api::parser::TriplesParser;
use rio_api::model::NamedNode;
use std::io::BufReader;
use std::fs::File;
use oxiri::Iri;
let rdf_type = NamedNode { iri: "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" };
let mut count = 0;
TurtleParser::new(BufReader::new(File::open("foo.ttl")?), Some(Iri::parse("file:foo.ttl".to_owned()).unwrap())).parse_all(&mut |t| {
if t.predicate == rdf_type {
count += 1;
}
Ok(()) as Result<(), TurtleError>
})?;
# Result::<_,TurtleError>::Ok(())
Replace TurtleParser
by NTriplesParser
, NQuadsParser
or TriGParser
to read an N-Triples, N-Quads or TriG file instead.
NTriplesParser
and NQuadsParser
do not use the second argument of the new
function that is the IRI of the file.