Struct rio_turtle::TriGParser

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

A TriG 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<B: BufRead> QuadSource for TriGParser<B>

type Error = <TriGParser<B> as QuadsParser>::Error

The type of errors produced by this source.

type Quad = ScopedRioSourceQuad

Determine the type of Quads that this quad source yields. (see streaming_mode

fn try_for_some_quad<F, EF>(
    &mut self,
    f: &mut F
) -> StreamResult<bool, Self::Error, EF> where
    F: FnMut(StreamedQuad<Self::Quad>) -> Result<(), EF>,
    EF: Error, 

Call f for at least one quad from this quad source, if any.

fn try_for_each_quad<F, E>(
    &mut self,
    f: F
) -> Result<(), StreamError<Self::Error, E>> where
    E: Error,
    F: FnMut(StreamedQuad<Self::Quad>) -> Result<(), E>, 

Call f for all quads from this quad source.

fn for_some_quad<F>(&mut self, f: &mut F) -> Result<bool, Self::Error> where
    F: FnMut(StreamedQuad<Self::Quad>), 

Call f for at least one quad from this quad source, if any.

fn for_each_quad<F>(&mut self, f: F) -> Result<(), Self::Error> where
    F: FnMut(StreamedQuad<Self::Quad>), 

Call f for all quads from this quad source.

fn filter_quads<F>(self, filter: F) -> FilterSource<Self, F> where
    F: FnMut(&StreamedQuad<Self::Quad>) -> bool, 

Creates a quad source which uses a closure to determine if a quad should be yielded.

fn filter_map_quads<F, T>(self, filter_map: F) -> FilterMapSource<Self, F> where
    F: FnMut(StreamedQuad<Self::Quad>) -> Option<T>, 

Creates a quad source that both filters and maps.

fn map_quads<F, T>(self, map: F) -> MapSource<Self, F> where
    F: FnMut(StreamedQuad<Self::Quad>) -> T, 

Takes a closure and creates quad source which yield the result of that closure for each quad.

fn size_hint_quads(&self) -> (usize, Option<usize>)

Returns the bounds on the remaining length of the quad source.

fn collect_quads<D>(
    self
) -> Result<D, StreamError<Self::Error, <D as Dataset>::Error>> where
    D: CollectibleDataset, 

Collect these quads into a new dataset.

fn add_to_dataset<D>(
    self,
    dataset: &mut D
) -> Result<usize, StreamError<Self::Error, <D as MutableDataset>::MutationError>> where
    D: MutableDataset, 

Insert all quads from this source into the given dataset.

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.