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use std::io::BufRead;
use crate::parser::rio_common::*;
use rio_api::parser::ParseError;
use rio_turtle::{TurtleError, TurtleParser as RioTurtleParser};
use sophia_api::parser::{Location, TripleParser, WithLocation};
use thiserror::Error;
#[derive(Clone, Debug, Default)]
pub struct TurtleParser {
pub base: Option<String>,
}
impl<B: BufRead> TripleParser<B> for TurtleParser {
type Source = StrictRioSource<RioTurtleParser<B>, TurtleError>;
fn parse(&self, data: B) -> Self::Source {
let base: &str = match &self.base {
Some(base) => &base,
None => "x-no-base:///",
};
StrictRioSource::from(RioTurtleParser::new(data, base))
}
}
#[derive(Debug, Error)]
#[error("{0}")]
pub struct SophiaTurtleError(pub TurtleError);
impl WithLocation for SophiaTurtleError {
fn location(&self) -> Location {
match self.0.textual_position() {
None => Location::Unknown,
Some(pos) => Location::from_lico(pos.line_number() + 1, pos.byte_number() + 1),
}
}
}
sophia_api::def_mod_functions_for_bufread_parser!(TurtleParser, TripleParser);
#[cfg(test)]
mod test {
use super::*;
use crate::graph::inmem::FastGraph;
use crate::graph::Graph;
use crate::triple::stream::TripleSource;
use sophia_api::ns::{rdf, xsd};
use sophia_api::term::matcher::ANY;
use sophia_term::StaticTerm;
#[test]
fn test_simple_turtle_string() -> std::result::Result<(), Box<dyn std::error::Error>> {
let turtle = r#"
@prefix : <http://example.org/ns/> .
<#me> :knows [ a :Person ; :name "Alice" ].
"#;
let mut g = FastGraph::new();
let p = TurtleParser {
base: Some("http://localhost/ex".into()),
};
let c = p.parse_str(&turtle).add_to_graph(&mut g)?;
assert_eq!(c, 3);
assert!(g
.triples_matching(
&StaticTerm::new_iri("http://localhost/ex#me").unwrap(),
&StaticTerm::new_iri("http://example.org/ns/knows").unwrap(),
&ANY,
)
.next()
.is_some());
assert!(g
.triples_matching(
&ANY,
&rdf::type_,
&StaticTerm::new_iri("http://example.org/ns/Person").unwrap(),
)
.next()
.is_some());
assert!(g
.triples_matching(
&ANY,
&StaticTerm::new_iri("http://example.org/ns/name").unwrap(),
&StaticTerm::new_literal_dt("Alice", xsd::string).unwrap(),
)
.next()
.is_some());
Ok(())
}
}