Struct rio_turtle::NTriplesParser
source · [−]pub struct NTriplesParser<R: BufRead> { /* private fields */ }
Expand description
A N-Triples and N-Triples-star streaming parser.
It implements the TriplesParser
trait.
Its memory consumption is linear in the size of the longest line of the file. It does not do any allocation during parsing except buffer resizing if a line significantly longer than the previous is encountered.
Count the number of people using the TriplesParser
API:
use rio_turtle::{NTriplesParser, TurtleError};
use rio_api::parser::TriplesParser;
use rio_api::model::NamedNode;
let file = b"<http://example.com/foo> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
<http://example.com/foo> <http://schema.org/name> \"Foo\" .
<http://example.com/bar> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://schema.org/Person> .
<http://example.com/bar> <http://schema.org/name> \"Bar\" .";
let rdf_type = NamedNode { iri: "http://www.w3.org/1999/02/22-rdf-syntax-ns#type" };
let schema_person = NamedNode { iri: "http://schema.org/Person" };
let mut count = 0;
NTriplesParser::new(file.as_ref()).parse_all(&mut |t| {
if t.predicate == rdf_type && t.object == schema_person.into() {
count += 1;
}
Ok(()) as Result<(), TurtleError>
})?;
assert_eq!(2, count);
Implementations
sourceimpl<R: BufRead> NTriplesParser<R>
impl<R: BufRead> NTriplesParser<R>
Trait Implementations
sourceimpl<R: BufRead> TriplesParser for NTriplesParser<R>
impl<R: BufRead> TriplesParser for NTriplesParser<R>
type Error = TurtleError
sourcefn parse_step<E: From<TurtleError>>(
&mut self,
on_triple: &mut impl FnMut(Triple<'_>) -> Result<(), E>
) -> Result<(), E>
fn parse_step<E: From<TurtleError>>(
&mut self,
on_triple: &mut impl FnMut(Triple<'_>) -> Result<(), E>
) -> Result<(), E>
Parses a small chunk of the file and calls on_triple
each time a new triple is read.
(A “small chunk” could be a line for an N-Triples parser.) Read more
Auto Trait Implementations
impl<R> RefUnwindSafe for NTriplesParser<R> where
R: RefUnwindSafe,
impl<R> Send for NTriplesParser<R> where
R: Send,
impl<R> Sync for NTriplesParser<R> where
R: Sync,
impl<R> Unpin for NTriplesParser<R> where
R: Unpin,
impl<R> UnwindSafe for NTriplesParser<R> where
R: UnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more