Struct rio_turtle::TriGParser

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

A TriG and TriG-star streaming parser.

It implements the QuadsParser trait.

Count the number of people using the QuadsParser API:

use rio_turtle::{TriGParser, TurtleError};
use rio_api::parser::QuadsParser;
use rio_api::model::NamedNode;

let file = b"@prefix schema: <http://schema.org/> .
<http://example/> {
    <http://example.com/foo> a schema:Person ;
        schema:name  \"Foo\" .
    <http://example.com/bar> a schema:Person ;
        schema: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;
TriGParser::new(file.as_ref(), None).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

impl<R: BufRead> TriGParser<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> QuadsParser for TriGParser<R>

type Error = TurtleError

fn parse_step<E: From<TurtleError>>(
    &mut self,
    on_quad: &mut impl FnMut(Quad<'_>) -> 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(Quad<'_>) -> 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
) -> QuadsParserIterator<T, E, F, Self> where
    E: From<Self::Error>,
    F: FnMut(Quad<'_>) -> Result<T, E>, 

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