feat: add rdf n-tripples graph load source #7
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,210 @@ | ||
| //! N-Triples edge iterator for the formats layer. | ||
| //! | ||
| //! ```no_run | ||
| //! use pathrex::formats::NTriples; | ||
| //! use pathrex::formats::FormatError; | ||
| //! | ||
| //! # let reader = std::io::empty(); | ||
| //! let iter = NTriples::new(reader) | ||
| //! .filter_map(|r| match r { | ||
| //! Err(FormatError::LiteralAsNode) => None, // skip | ||
| //! other => Some(other), | ||
| //! }); | ||
| //! ``` | ||
| //! | ||
| //! To load into a graph: | ||
| //! | ||
| //! ```no_run | ||
| //! use pathrex::graph::{Graph, InMemory, GraphDecomposition}; | ||
| //! use pathrex::formats::NTriples; | ||
| //! use std::fs::File; | ||
| //! | ||
| //! let graph = Graph::<InMemory>::try_from( | ||
| //! NTriples::new(File::open("data.nt").unwrap()) | ||
| //! ).unwrap(); | ||
| //! ``` | ||
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| use std::io::Read; | ||
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| use oxrdf::{NamedOrBlankNode, Term}; | ||
| use oxttl::NTriplesParser; | ||
| use oxttl::ntriples::ReaderNTriplesParser; | ||
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| use crate::formats::FormatError; | ||
| use crate::graph::Edge; | ||
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| /// An iterator that reads N-Triples and yields `Result<Edge, FormatError>`. | ||
| /// | ||
| /// # Example | ||
| /// | ||
| /// ```no_run | ||
| /// use pathrex::formats::nt::NTriples; | ||
| /// use std::fs::File; | ||
| /// | ||
| /// let file = File::open("data.nt").unwrap(); | ||
| /// let iter = NTriples::new(file); | ||
| /// for result in iter { | ||
| /// let edge = result.unwrap(); | ||
| /// println!("{} --{}--> {}", edge.source, edge.label, edge.target); | ||
| /// } | ||
| /// ``` | ||
| pub struct NTriples<R: Read> { | ||
| inner: ReaderNTriplesParser<R>, | ||
| } | ||
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| impl<R: Read> NTriples<R> { | ||
| pub fn new(reader: R) -> Self { | ||
| Self { | ||
| inner: NTriplesParser::new().for_reader(reader), | ||
| } | ||
| } | ||
|
|
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| fn subject_to_node_id(subject: NamedOrBlankNode) -> String { | ||
| match subject { | ||
| NamedOrBlankNode::NamedNode(n) => n.into_string(), | ||
| NamedOrBlankNode::BlankNode(b) => format!("_:{}", b.as_str()), | ||
| } | ||
| } | ||
|
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| fn object_to_node_id(object: Term) -> Result<String, FormatError> { | ||
| match object { | ||
| Term::NamedNode(n) => Ok(n.into_string()), | ||
| Term::BlankNode(b) => Ok(format!("_:{}", b.as_str())), | ||
| Term::Literal(_) => Err(FormatError::LiteralAsNode), | ||
| } | ||
| } | ||
| } | ||
|
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| impl<R: Read> Iterator for NTriples<R> { | ||
|
Collaborator
There was a problem hiding this comment. We lose info about difference between these two predicates if use LocalName. Is it good?
Collaborator
Author
There was a problem hiding this comment. Decided to get rid of local name extraction strategy and stick to fulliri always |
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| type Item = Result<Edge, FormatError>; | ||
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| fn next(&mut self) -> Option<Self::Item> { | ||
| let triple = match self.inner.next()? { | ||
| Ok(t) => t, | ||
| Err(e) => return Some(Err(FormatError::NTriples(e.to_string()))), | ||
| }; | ||
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| let source = Self::subject_to_node_id(triple.subject.into()); | ||
| let label = triple.predicate.as_str().to_owned(); | ||
| let target = match Self::object_to_node_id(triple.object) { | ||
| Ok(t) => t, | ||
| Err(e) => return Some(Err(e)), | ||
| }; | ||
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| Some(Ok(Edge { | ||
| source, | ||
| target, | ||
| label, | ||
| })) | ||
| } | ||
| } | ||
|
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| #[cfg(test)] | ||
| mod tests { | ||
|
Member
There was a problem hiding this comment. Could you, please, introduce a test involving non-ascii chars. Especially I am interested in Chinese and Cyrillic support.
Collaborator
Author
There was a problem hiding this comment. Added test with russain and chinese alice and bob |
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| use super::*; | ||
|
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| fn parse(nt: &str) -> Vec<Result<Edge, FormatError>> { | ||
| NTriples::new(nt.as_bytes()).collect() | ||
| } | ||
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| #[test] | ||
| fn test_basic_ntriples() { | ||
| let nt = "<http://example.org/Alice> <http://example.org/knows> <http://example.org/Bob> .\n\ | ||
| <http://example.org/Bob> <http://example.org/likes> <http://example.org/Charlie> .\n"; | ||
| let edges = parse(nt); | ||
| assert_eq!(edges.len(), 2); | ||
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| let e0 = edges[0].as_ref().unwrap(); | ||
| assert_eq!(e0.source, "http://example.org/Alice"); | ||
| assert_eq!(e0.target, "http://example.org/Bob"); | ||
| assert_eq!(e0.label, "http://example.org/knows"); | ||
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| let e1 = edges[1].as_ref().unwrap(); | ||
| assert_eq!(e1.source, "http://example.org/Bob"); | ||
| assert_eq!(e1.target, "http://example.org/Charlie"); | ||
| assert_eq!(e1.label, "http://example.org/likes"); | ||
| } | ||
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| #[test] | ||
| fn test_blank_node_subject_and_object() { | ||
| let nt = "_:b1 <http://example.org/knows> _:b2 .\n"; | ||
| let edges = parse(nt); | ||
| assert_eq!(edges.len(), 1); | ||
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| let e = edges[0].as_ref().unwrap(); | ||
| assert_eq!(e.source, "_:b1"); | ||
| assert_eq!(e.target, "_:b2"); | ||
| } | ||
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| #[test] | ||
| fn test_literal_object_yields_error() { | ||
| let nt = "<http://example.org/Alice> <http://example.org/name> \"Alice\" .\n"; | ||
| let edges = parse(nt); | ||
| assert_eq!(edges.len(), 1); | ||
| assert!( | ||
| matches!(edges[0], Err(FormatError::LiteralAsNode)), | ||
| "literal object should yield LiteralAsNode error" | ||
| ); | ||
| } | ||
|
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| #[test] | ||
| fn test_caller_can_skip_literal_triples() { | ||
| let nt = "<http://example.org/Alice> <http://example.org/knows> <http://example.org/Bob> .\n\ | ||
| <http://example.org/Alice> <http://example.org/name> \"Alice\" .\n\ | ||
| <http://example.org/Bob> <http://example.org/knows> <http://example.org/Charlie> .\n"; | ||
| let edges: Vec<_> = NTriples::new(nt.as_bytes()) | ||
| .filter_map(|r| match r { | ||
| Err(FormatError::LiteralAsNode) => None, | ||
| other => Some(other), | ||
| }) | ||
| .collect(); | ||
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| assert_eq!(edges.len(), 2, "literal triple should be skipped"); | ||
| assert!(edges.iter().all(|r| r.is_ok())); | ||
| } | ||
|
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| #[test] | ||
| fn test_predicate_with_fragment_is_full_iri_string() { | ||
| let nt = | ||
| "<http://example.org/Alice> <http://example.org/ns#knows> <http://example.org/Bob> .\n"; | ||
| let edges = parse(nt); | ||
| assert_eq!( | ||
| edges[0].as_ref().unwrap().label, | ||
| "http://example.org/ns#knows" | ||
| ); | ||
| } | ||
|
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| #[test] | ||
| fn test_non_ascii_in_iris() { | ||
| let nt = "<http://example.org/人甲> <http://example.org/关系/认识> <http://example.org/人乙> .\n\ | ||
| <http://example.org/Алиса> <http://example.org/знает> <http://example.org/Боб> .\n"; | ||
| let edges = parse(nt); | ||
| assert_eq!(edges.len(), 2); | ||
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| let e0 = edges[0].as_ref().unwrap(); | ||
| assert_eq!(e0.source, "http://example.org/人甲"); | ||
| assert_eq!(e0.target, "http://example.org/人乙"); | ||
| assert_eq!(e0.label, "http://example.org/关系/认识"); | ||
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| let e1 = edges[1].as_ref().unwrap(); | ||
| assert_eq!(e1.source, "http://example.org/Алиса"); | ||
| assert_eq!(e1.target, "http://example.org/Боб"); | ||
| assert_eq!(e1.label, "http://example.org/знает"); | ||
| } | ||
|
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| #[test] | ||
| fn test_ntriples_graph_source() { | ||
| use crate::graph::{GraphBuilder, GraphDecomposition, InMemoryBuilder}; | ||
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| let nt = "<http://example.org/A> <http://example.org/knows> <http://example.org/B> .\n\ | ||
| <http://example.org/B> <http://example.org/knows> <http://example.org/C> .\n"; | ||
| let iter = NTriples::new(nt.as_bytes()); | ||
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| let graph = InMemoryBuilder::default() | ||
| .load(iter) | ||
| .expect("load should succeed") | ||
| .build() | ||
| .expect("build should succeed"); | ||
| assert_eq!(graph.num_nodes(), 3); | ||
| } | ||
| } | ||
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