Struct rio_turtle::GTriGParser

pub struct GTriGParser<R: BufRead> { /* private fields */ }

A TriG streaming parser parsing generalized quads.

It implements the GeneralizedQuadsParser trait. Using it requires to enable the generalized feature.

Count the number of people using the QuadsParser API:

use rio_turtle::{GTriGParser, TurtleError};
use rio_api::parser::GeneralizedQuadsParser;
use rio_api::model::NamedNode;

let file = b"@prefix schema: <http://schema.org/> .
<http://example/> {
    <http://example.com/foo> a schema:Person ;
        schema:name  ?name .
    <http://example.com/bar> a schema:Person ;
        schema:name  ?name .
}";

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;
GTriGParser::new(file.as_ref(), None).parse_all(&mut |t| {
    if t.predicate == rdf_type.into() && t.object == schema_person.into() {
        count += 1;
    }
    Ok(()) as Result<(), TurtleError>
})?;
assert_eq!(2, count);

Implementations

impl<R: BufRead> GTriGParser<R>

pub fn new(reader: R, base_iri: Option<Iri<String>>) -> Self

Builds the parser from a BufRead implementation, and a base IRI for relative IRI resolution.

Trait Implementations

impl<R: BufRead> GeneralizedQuadsParser for GTriGParser<R>

type Error = TurtleError

fn parse_step<E: From<TurtleError>>( &mut self, on_quad: &mut impl FnMut(GeneralizedQuad<'_>) -> Result<(), E> ) -> Result<(), E>

Parses a small chunk of the file and calls on_quad each time a new quad is read. (A “small chunk” could be a line for an N-Quads parser.)

fn is_end(&self) -> bool

Returns true if the file has been completely consumed by the parser.

fn parse_all<E>( &mut self, on_quad: &mut impl FnMut(GeneralizedQuad<'_>) -> Result<(), E> ) -> Result<(), E>where E: From<Self::Error>,

Parses the complete file and calls on_quad each time a new quad is read.

fn into_iter<T, E, F>( self, convert_quad: F ) -> GeneralizedQuadsParserIterator<T, E, F, Self>where E: From<Self::Error>, F: FnMut(GeneralizedQuad<'_>) -> Result<T, E>, Self: Sized,

Converts the parser into a Result<T, E> iterator.