rdf_dynsyn

This crate provides sophia-compatible and sophia-based rdf parsers/serializers, that can be instantiated against any of supported syntaxes dynamically at run time. git

Why?

Although sophia provides specialized parsers/serializers for each syntax, we have to know document syntax at code-time to practically use them. In many cases of web, we may know syntax of a doc only at runtime, like from content-type, file-extn, etc. As each specialized parser parses to corresponding stream types, etc.. it will be difficult to work with them in such dynamic cases. For Handling such cases this crate provides well-tested abstractions, that integrates into sophia eco-system.

Getting Started

Following a short example how to get syntax from media-types/file-extensions, and instantiate parser for detected syntax, parse content,mutate it and serialize back into desired syntax. Also see documentation for more.

```rust use std::str::FromStr;

use mime::Mime; use sophiaapi::{ graph::MutableGraph, ns::Namespace, parser::TripleParser, serializer::{Stringifier, TripleSerializer}, triple::stream::TripleSource, }; use sophiainmem::graph::FastGraph; use sophia_term::BoxTerm;

use rdf_dynsyn::{ correspondence::Correspondent, parser::triples::, serializer::triples::, syntax::RdfSyntax, };

//  let's say following are input params, we get dynamically. media_type, content of source doc, and target media_type to convert into
let src_doc_media_type = "text/turtle";
let tgt_doc_media_type = "application/rdf+xml";
let src_doc_content = r#"
    @prefix : <http://example.org/>.
    @prefix foaf: <http://xmlns.com/foaf/0.1/>.

    :alice foaf:name "Alice";
        foaf:mbox <mailto:alice@work.example> .
    :bob foaf:name "Bob".
"#;

// resolve syntaxes for media_types. Or one can use static constants exported by `syntax` module,
let src_doc_syntax =
    Correspondent::<RdfSyntax>::try_from(&Mime::from_str(src_doc_media_type)?)?.value;
let tgt_doc_syntax =
    Correspondent::<RdfSyntax>::try_from(&Mime::from_str(tgt_doc_media_type)?)?.value;

// get parser for source syntax
let parser_factory = DynSynTripleParserFactory::default();
let parser = parser_factory.new_parser::<BoxTerm>(src_doc_syntax.try_into()?, None, None);

// parse to a graph
let mut graph: FastGraph = parser.parse_str(src_doc_content).collect_triples()?;

// mutate graph
let ex = Namespace::new("http://example.org/")?;
let foaf = Namespace::new("http://xmlns.com/foaf/0.1/")?;
graph.insert(&ex.get("bob")?, &foaf.get("knows")?, &ex.get("alice")?)?;

// get serializer for target syntax
let serializer_factory = DynSynTripleSerializerFactory::new(None); // Here we can pass optional formatting options. see documentation.
let mut serializer = serializer_factory.new_stringifier(tgt_doc_syntax.try_into()?);
let serialized_doc = serializer.serialize_graph(&graph)?.as_str();
println!("The resulting graph\n{}", serialized_doc);

```

License: MIT OR Apache-2.0