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json-ld
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JSON-LD implementation for Rust
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# A JSON-LD implementation for Rust [](https://github.com/timothee-haudebourg/json-ld/actions) [](https://crates.io/crates/json-ld) [](https://crates.io/crates/json-ld) [](https://github.com/timothee-haudebourg/json-ld#license) [](https://docs.rs/json-ld) <!-- cargo-rdme start --> This crate is a Rust implementation of the [JSON-LD](https://www.w3.org/TR/json-ld/) data interchange format. [Linked Data (LD)](https://www.w3.org/standards/semanticweb/data) is a [World Wide Web Consortium (W3C)](https://www.w3.org/) initiative built upon standard Web technologies to create an interrelated network of datasets across the Web. The [JavaScript Object Notation (JSON)](https://tools.ietf.org/html/rfc7159) is a widely used, simple, unstructured data serialization format to describe data objects in a human readable way. JSON-LD brings these two technologies together, adding semantics to JSON to create a lightweight data serialization format that can organize data and help Web applications to inter-operate at a large scale. ## Usage The entry point for this library is the `JsonLdProcessor` trait that provides an access to all the JSON-LD transformation algorithms (context processing, expansion, compaction, etc.). If you want to explore and/or transform `ExpandedDocument`s, you may also want to check out the [`Object`] type representing a JSON object. ### Expansion If you want to expand a JSON-LD document, first describe the document to be expanded using either `RemoteDocument` or `RemoteDocumentReference`: - `RemoteDocument` wraps the JSON representation of the document alongside its remote URL. - `RemoteDocumentReference` may represent only an URL, letting some loader fetching the remote document by dereferencing the URL. After that, you can simply use the [`JsonLdProcessor::expand`] function on the remote document. [`JsonLdProcessor::expand`]: JsonLdProcessor::expand #### Example ```rust use iref::IriBuf; use static_iref::iri; use json_ld::{JsonLdProcessor, Options, RemoteDocument, syntax::{Value, Parse}}; // Create a "remote" document by parsing a file manually. let input = RemoteDocument::new( // We use `IriBuf` as IRI type. Some(iri!("https://example.com/sample.jsonld").to_owned()), // Optional content type. Some("application/ld+json".parse().unwrap()), // Parse the file. Value::parse_str(r#" { "@context": { "name": "http://xmlns.com/foaf/0.1/name" }, "@id": "https://www.rust-lang.org", "name": "Rust Programming Language" }"#).expect("unable to parse file").0 ); // Use `NoLoader` as we won't need to load any remote document. let mut loader = json_ld::NoLoader; // Expand the "remote" document. let expanded = input .expand(&mut loader) .await .expect("expansion failed"); for object in expanded { if let Some(id) = object.id() { let name = object.as_node().unwrap() .get_any(&iri!("http://xmlns.com/foaf/0.1/name")).unwrap() .as_str().unwrap(); println!("id: {id}"); println!("name: {name}"); } } ``` Here is another example using `RemoteDocumentReference`. ```rust use static_iref::iri; use json_ld::{JsonLdProcessor, Options, RemoteDocumentReference}; let input = RemoteDocumentReference::iri(iri!("https://example.com/sample.jsonld").to_owned()); // Use `FsLoader` to redirect any URL starting with `https://example.com/` to // the local `example` directory. No HTTP query. let mut loader = json_ld::FsLoader::default(); loader.mount(iri!("https://example.com/").to_owned(), "examples"); let expanded = input.expand(&mut loader) .await .expect("expansion failed"); ``` Lastly, the same example replacing [`IriBuf`] with the lightweight [`rdf_types::vocabulary::Index`] type. [`IriBuf`]: https://docs.rs/iref/latest/iref/struct.IriBuf.html ```rust use rdf_types::{Subject, vocabulary::{IriVocabularyMut, IndexVocabulary}}; use contextual::WithContext; // Creates the vocabulary that will map each `rdf_types::vocabulary::Index` // to an actual `IriBuf`. let mut vocabulary: IndexVocabulary = IndexVocabulary::new(); let iri_index = vocabulary.insert(iri!("https://example.com/sample.jsonld")); let input = RemoteDocumentReference::iri(iri_index); // Use `FsLoader` to redirect any URL starting with `https://example.com/` to // the local `example` directory. No HTTP query. let mut loader = json_ld::FsLoader::default(); loader.mount(iri!("https://example.com/").to_owned(), "examples"); let expanded = input .expand_with(&mut vocabulary, &mut loader) .await .expect("expansion failed"); // `foaf:name` property identifier. let name_id = Subject::Iri(vocabulary.insert(iri!("http://xmlns.com/foaf/0.1/name"))); for object in expanded { if let Some(id) = object.id() { let name = object.as_node().unwrap() .get_any(&name_id).unwrap() .as_value().unwrap() .as_str().unwrap(); println!("id: {}", id.with(&vocabulary)); println!("name: {name}"); } } ``` ### Compaction The JSON-LD Compaction is a transformation that consists in applying a context to a given JSON-LD document reducing its size. There are two ways to get a compact JSON-LD document with this library depending on your starting point: - If you want to get a compact representation for an arbitrary remote document, simply use the `JsonLdProcessor::compact` (or `JsonLdProcessor::compact_with`) method. - Otherwise to compact an `ExpandedDocument` you can use the `Compact::compact` method. #### Example Here is an example compaction an arbitrary `RemoteDocumentReference` using `JsonLdProcessor::compact`. ```rust use static_iref::iri; use json_ld::{JsonLdProcessor, Options, RemoteDocumentReference, RemoteContextReference, syntax::Print}; let input = RemoteDocumentReference::iri(iri!("https://example.com/sample.jsonld").to_owned()); let context = RemoteContextReference::iri(iri!("https://example.com/context.jsonld").to_owned()); // Use `FsLoader` to redirect any URL starting with `https://example.com/` to // the local `example` directory. No HTTP query. let mut loader = json_ld::FsLoader::default(); loader.mount(iri!("https://example.com/").to_owned(), "examples"); let compact = input .compact(context, &mut loader) .await .expect("compaction failed"); println!("output: {}", compact.pretty_print()); ``` ### Flattening The JSON-LD Flattening is a transformation that consists in moving nested nodes out. The result is a list of all the nodes declared in the document. There are two ways to flatten JSON-LD document with this library depending on your starting point: - If you want to get a compact representation for an arbitrary remote document, simply use the `JsonLdProcessor::flatten` (or `JsonLdProcessor::flatten_with`) method. This will return a JSON-LD document. - Otherwise to compact an `ExpandedDocument` you can use the `Flatten::flatten` (or `Flatten::flatten_with`) method. This will return the list of nodes as a `FlattenedDocument`. Flattening requires assigning an identifier to nested anonymous nodes, which is why the flattening functions take an [`rdf_types::MetaGenerator`] as parameter. This generator is in charge of creating new fresh identifiers (with their metadata). The most common generator is [`rdf_types::generator::Blank`] that creates blank node identifiers. [`rdf_types::MetaGenerator`]: https://docs.rs/rdf-types/latest/rdf_types/generator/trait.MetaGenerator.html [`rdf_types::generator::Blank`]: https://docs.rs/rdf-types/latest/rdf_types/generator/struct.Blank.html #### Example Here is an example compaction an arbitrary `RemoteDocumentReference` using `JsonLdProcessor::flatten`. ```rust use static_iref::iri; use json_ld::{JsonLdProcessor, Options, RemoteDocumentReference, syntax::Print}; let input = RemoteDocumentReference::iri(iri!("https://example.com/sample.jsonld").to_owned()); // Use `FsLoader` to redirect any URL starting with `https://example.com/` to // the local `example` directory. No HTTP query. let mut loader = json_ld::FsLoader::default(); loader.mount(iri!("https://example.com/").to_owned(), "examples"); let mut generator = rdf_types::generator::Blank::new(); let nodes = input .flatten(&mut generator, &mut loader) .await .expect("flattening failed"); println!("output: {}", nodes.pretty_print()); ``` ## Fast IRIs and Blank Node Identifiers This library gives you the opportunity to use any datatype you want to represent IRIs an Blank Node Identifiers. Most types have them parameterized. To avoid unnecessary allocations and expensive comparisons, it is highly recommended to use a cheap, lightweight datatype such as [`rdf_types::vocabulary::Index`]. This type will represent each distinct IRI/blank node identifier with a unique index. In this case a [`rdf_types::IndexVocabulary`] that maps each index back/to its original IRI/Blank identifier representation can be passed to every function. You can also use your own index type, with your own [`rdf_types::Vocabulary`] implementation. [`rdf_types::vocabulary::Index`]: https://docs.rs/rdf-types/latest/rdf_types/vocabulary/struct.Index.html [`rdf_types::IndexVocabulary`]: https://docs.rs/rdf-types/latest/rdf_types/vocabulary/struct.IndexVocabulary.html [`rdf_types::Vocabulary`]: https://docs.rs/rdf-types/latest/rdf_types/vocabulary/trait.Vocabulary.html ### Displaying vocabulary-dependent values Since using vocabularies separates IRIs and Blank ids from their textual representation, it complicates displaying data using them. Fortunately many types defined by `json-ld` implement the [`contextual::DisplayWithContext`] trait that allow displaying value with a "context", which here would be the vocabulary. By importing the [`contextual::WithContext`] which provides the `with` method you can display such value like this: ```rust use static_iref::iri; use rdf_types::vocabulary::{IriVocabularyMut, IndexVocabulary}; use contextual::WithContext; let mut vocabulary: IndexVocabulary = IndexVocabulary::new(); let i = vocabulary.insert(iri!("https://docs.rs/contextual")); let value = rdf_types::Subject::Iri(i); println!("{}", value.with(&vocabulary)) ``` [`contextual::DisplayWithContext`]: https://docs.rs/contextual/latest/contextual/trait.DisplayWithContext.html [`contextual::WithContext`]: https://docs.rs/contextual/latest/contextual/trait.WithContext.html <!-- cargo-rdme end --> ## Testing To run the tests for the first time use the following commands in a shell: ```sh git submodule init git submodule update cargo test ``` This will clone the [W3C JSON-LD API repository](https://github.com/w3c/json-ld-api) containing the official test suite, generate the associated Rust tests using the procedural macros provided by the [`json-ld-testing`](crates/testing) crate and run the tests. Afterward a simple `cargo test` will rerun the tests. ## Sponsor Many thanks to [SpruceID](https://www.spruceid.com/) for sponsoring this project! ## License Licensed under either of * Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0) * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT) at your option. ### Contribution Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.
