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71 lines
3.4 KiB
71 lines
3.4 KiB
Sparesults
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==========
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[](https://crates.io/crates/sparesults)
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[](https://docs.rs/sparesults)
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[](https://crates.io/crates/sparesults)
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[](https://github.com/oxigraph/oxigraph/actions)
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[](https://gitter.im/oxigraph/community?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
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Sparesults is a set of parsers and serializers for [SPARQL](https://www.w3.org/TR/sparql11-overview/) query results formats.
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It supports [SPARQL Query Results XML Format (Second Edition)](http://www.w3.org/TR/rdf-sparql-XMLres/), [SPARQL 1.1 Query Results JSON Format](https://www.w3.org/TR/sparql11-results-json/) and [SPARQL 1.1 Query Results CSV and TSV Formats](https://www.w3.org/TR/2013/REC-sparql11-results-csv-tsv-20130321/).
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Support for [SPARQL-star](https://w3c.github.io/rdf-star/cg-spec/#query-result-formats) is also available behind the `rdf-star` feature.
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This crate is intended to be a building piece for SPARQL client and server implementations in Rust like [Oxigraph](https://oxigraph.org).
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Usage example converting a JSON result file into a TSV result file:
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```rust
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use sparesults::{QueryResultsFormat, QueryResultsParser, QueryResultsReader, QueryResultsSerializer};
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use std::io::Result;
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fn convert_json_to_tsv(json_file: &[u8]) -> Result<Vec<u8>> {
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let json_parser = QueryResultsParser::from_format(QueryResultsFormat::Json);
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let tsv_serializer = QueryResultsSerializer::from_format(QueryResultsFormat::Tsv);
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// We start to read the JSON file and see which kind of results it is
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match json_parser.read_results(json_file)? {
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QueryResultsReader::Boolean(value) => {
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// it's a boolean result, we copy it in TSV to the output buffer
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tsv_serializer.write_boolean_result(Vec::new(), value)
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},
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QueryResultsReader::Solutions(solutions_reader) => {
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// it's a set of solutions, we create a writer and we write to it while reading in streaming from the JSON file
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let mut solutions_writer = tsv_serializer.solutions_writer(Vec::new(), solutions_reader.variables().to_vec())?;
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for solution in solutions_reader {
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solutions_writer.write(&solution?)?;
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}
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solutions_writer.finish()
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}
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}
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}
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// Let's test with a boolean
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assert_eq!(
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convert_json_to_tsv(b"{\"boolean\":true}".as_slice()).unwrap(),
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b"true"
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);
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// And with a set of solutions
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assert_eq!(
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convert_json_to_tsv(b"{\"head\":{\"vars\":[\"foo\",\"bar\"]},\"results\":{\"bindings\":[{\"foo\":{\"type\":\"literal\",\"value\":\"test\"}}]}}".as_slice()).unwrap(),
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b"?foo\t?bar\n\"test\"\t"
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);
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```
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## License
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This project is licensed under either of
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* Apache License, Version 2.0, ([LICENSE-APACHE](../LICENSE-APACHE) or
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`<http://www.apache.org/licenses/LICENSE-2.0>`)
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* MIT license ([LICENSE-MIT](../LICENSE-MIT) or
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`<http://opensource.org/licenses/MIT>`)
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at your option.
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Oxigraph by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
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