Struct RdfParser 

pub struct RdfParser { /* private fields */ }

Parsers for RDF serialization formats.

It currently supports the following formats:

• JSON-LD 1.0 (RdfFormat::JsonLd)
• N3 (RdfFormat::N3)
• N-Quads (RdfFormat::NQuads)
• N-Triples (RdfFormat::NTriples)
• RDF/XML (RdfFormat::RdfXml)
• TriG (RdfFormat::TriG)
• Turtle (RdfFormat::Turtle)

Note the useful options:

• with_base_iri to resolve the relative IRIs.
• rename_blank_nodes to rename the blank nodes to auto-generated numbers to avoid conflicts when merging RDF graphs together.
• without_named_graphs to parse a single graph.
• unchecked to skip some validations if the file is already known to be valid.

use oxrdfio::{RdfFormat, RdfParser};

let file = "<http://example.com/s> <http://example.com/p> <http://example.com/o> .";

let quads = RdfParser::from_format(RdfFormat::NTriples)
    .for_reader(file.as_bytes())
    .collect::<Result<Vec<_>, _>>()?;

assert_eq!(quads.len(), 1);
assert_eq!(quads[0].subject.to_string(), "<http://example.com/s>");

Implementations

impl RdfParser

pub fn from_format(format: RdfFormat) -> RdfParser

Builds a parser for the given format.

pub fn format(&self) -> RdfFormat

The format the parser uses.

use oxrdfio::{RdfFormat, RdfParser};

assert_eq!(
    RdfParser::from_format(RdfFormat::Turtle).format(),
    RdfFormat::Turtle
);

pub fn with_base_iri( self, base_iri: impl Into<String>, ) -> Result<RdfParser, IriParseError>

Provides an IRI that could be used to resolve the file relative IRIs.

use oxrdfio::{RdfFormat, RdfParser};

let file = "</s> </p> </o> .";

let quads = RdfParser::from_format(RdfFormat::Turtle)
    .with_base_iri("http://example.com")?
    .for_reader(file.as_bytes())
    .collect::<Result<Vec<_>, _>>()?;

assert_eq!(quads.len(), 1);
assert_eq!(quads[0].subject.to_string(), "<http://example.com/s>");

pub fn with_default_graph( self, default_graph: impl Into<GraphName>, ) -> RdfParser

Provides the name graph name that should replace the default graph in the returned quads.

use oxrdf::NamedNode;
use oxrdfio::{RdfFormat, RdfParser};

let file = "<http://example.com/s> <http://example.com/p> <http://example.com/o> .";

let quads = RdfParser::from_format(RdfFormat::Turtle)
    .with_default_graph(NamedNode::new("http://example.com/g")?)
    .for_reader(file.as_bytes())
    .collect::<Result<Vec<_>, _>>()?;

assert_eq!(quads.len(), 1);
assert_eq!(quads[0].graph_name.to_string(), "<http://example.com/g>");

pub fn without_named_graphs(self) -> RdfParser

Sets that the parser must fail if parsing a named graph.

This function restricts the parser to only parse a single RDF graph and not an RDF dataset.

use oxrdfio::{RdfFormat, RdfParser};

let file = "<http://example.com/s> <http://example.com/p> <http://example.com/o> <http://example.com/g> .";

let parser = RdfParser::from_format(RdfFormat::NQuads).without_named_graphs();
assert!(parser.for_reader(file.as_bytes()).next().unwrap().is_err());

pub fn rename_blank_nodes(self) -> RdfParser

Renames the blank nodes ids from the ones set in the serialization to random ids.

This allows to avoid id conflicts when merging graphs together.

use oxrdfio::{RdfFormat, RdfParser};

let file = "_:a <http://example.com/p> <http://example.com/o> .";

let result1 = RdfParser::from_format(RdfFormat::NQuads)
    .rename_blank_nodes()
    .for_reader(file.as_bytes())
    .collect::<Result<Vec<_>, _>>()?;
let result2 = RdfParser::from_format(RdfFormat::NQuads)
    .rename_blank_nodes()
    .for_reader(file.as_bytes())
    .collect::<Result<Vec<_>, _>>()?;
assert_ne!(result1, result2);

pub fn lenient(self) -> RdfParser

Assumes the file is valid to make parsing faster.

It will skip some validations.

Note that if the file is actually not valid, the parser might emit broken RDF.

pub fn unchecked(self) -> RdfParser

👎Deprecated since 0.2.0: Use lenient() instead

pub fn for_reader<R>(self, reader: R) -> ReaderQuadParser<R>

where R: Read,

Parses from a Read implementation and returns an iterator of quads.

Reads are buffered.

use oxrdfio::{RdfFormat, RdfParser};

let file = "<http://example.com/s> <http://example.com/p> <http://example.com/o> .";

let quads = RdfParser::from_format(RdfFormat::NTriples)
    .for_reader(file.as_bytes())
    .collect::<Result<Vec<_>, _>>()?;

assert_eq!(quads.len(), 1);
assert_eq!(quads[0].subject.to_string(), "<http://example.com/s>");

pub fn for_slice( self, slice: &(impl AsRef<[u8]> + ?Sized), ) -> SliceQuadParser<'_>

Parses from a byte slice and returns an iterator of quads.

use oxrdfio::{RdfFormat, RdfParser};

let file = "<http://example.com/s> <http://example.com/p> <http://example.com/o> .";

let quads = RdfParser::from_format(RdfFormat::NTriples)
    .for_slice(file)
    .collect::<Result<Vec<_>, _>>()?;

assert_eq!(quads.len(), 1);
assert_eq!(quads[0].subject.to_string(), "<http://example.com/s>");

pub fn split_slice_for_parallel_parsing( self, slice: &(impl AsRef<[u8]> + ?Sized), target_parallelism: usize, ) -> Vec<SliceQuadParser<'_>>

Creates a vector of parsers that may be used to parse the document slice in parallel. To dynamically specify target_parallelism, use e.g. std::thread::available_parallelism.

This only works for N-Triples and N-Quads and is only interesting on large documents.

use oxrdfio::{RdfFormat, RdfParser};

let file = "<http://example.com/s> <http://example.com/p> <http://example.com/o> .";

let quads = RdfParser::from_format(RdfFormat::NTriples)
    .split_slice_for_parallel_parsing(file, 4)
    .into_iter()
    .flatten()
    .collect::<Result<Vec<_>, _>>()?;

assert_eq!(quads.len(), 1);
assert_eq!(quads[0].subject.to_string(), "<http://example.com/s>");

pub fn split_file_for_parallel_parsing( self, path: impl AsRef<Path>, target_parallelism: usize, ) -> Result<Vec<ReaderQuadParser<Take<File>>>, Error>

Creates a vector of parsers that may be used to parse the file in parallel. To dynamically specify target_parallelism, use e.g. std::thread::available_parallelism.

This only works for N-Triples and N-Quads and is only interesting on large documents.

use oxrdfio::{RdfFormat, RdfParser};

let quads = RdfParser::from_format(RdfFormat::NTriples)
    .split_file_for_parallel_parsing(&path, 4)?
    .into_iter()
    .flatten()
    .collect::<Result<Vec<_>, _>>()?;

assert_eq!(quads.len(), 1);
assert_eq!(quads[0].subject.to_string(), "<http://example.com/s>");

Trait Implementations

impl Clone for RdfParser

fn clone(&self) -> RdfParser

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl From<RdfFormat> for RdfParser

fn from(format: RdfFormat) -> RdfParser

Converts to this type from the input type.