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  1. 5
      .gitignore
  2. 18
      Cargo.toml
  3. 201
      LICENSE-APACHE
  4. 25
      LICENSE-MIT
  5. 22
      README.md
  6. 5
      build.rs
  7. 5
      src/lib.rs
  8. 444
      src/model/data.rs
  9. 1
      src/model/mod.rs
  10. 38
      src/rio/mod.rs
  11. 102
      src/rio/ntriples/grammar.rustpeg
  12. 30
      src/rio/ntriples/mod.rs

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.gitignore vendored
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target/
**/*.rs.bk
Cargo.lock
.idea
*.iml

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Cargo.toml
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[package]
name = "rudf"
version = "0.0.1"
authors = ["Tpt <thomas@pellissier-tanon.fr>"]
license = "MIT/Apache-2.0"
readme = "../README.md"
keywords = ["RDF"]
repository = "https://github.com/Tpt/rudf"
description = """
An RDF library in Rust
"""
build = "build.rs"
[dependencies]
lazy_static = "^1.0"
[build-dependencies]
peg = "0.5"

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LICENSE-APACHE
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Apache License
Version 2.0, January 2004
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Copyright (c) 2018 RUDF developers
Permission is hereby granted, free of charge, to any
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# Rudf
This library is a work in progress of a [RDF](https://www.w3.org/RDF/) stack implementation in [Rust](https://www.rust-lang.org).
Its goal is to provide a compliant, safe and fast implementation of W3C specifications in Rust.
# License
This project is 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 Futures 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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build.rs
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extern crate peg;
fn main() {
peg::cargo_build("src/rio/ntriples/grammar.rustpeg");
}

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src/lib.rs
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#[macro_use]
extern crate lazy_static;
pub mod model;
pub mod rio;

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src/model/data.rs
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///! Implements data structures for https://www.w3.org/TR/rdf11-concepts/
///! Inspired by [RDFjs](http://rdf.js.org/)
use std::fmt;
use std::option::Option;
use std::sync::Arc;
use std::sync::Mutex;
/// A RDF [IRI](https://www.w3.org/TR/rdf11-concepts/#dfn-iri)
#[derive(Eq, PartialEq, Debug, Clone, Hash)]
pub struct NamedNode {
iri: String,
}
impl NamedNode {
pub fn value(&self) -> &str {
&self.iri
}
}
impl fmt::Display for NamedNode {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "<{}>", self.value())
}
}
/// A RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node)
#[derive(Eq, PartialEq, Debug, Clone, Hash)]
pub struct BlankNode {
id: String,
}
impl BlankNode {
pub fn value(&self) -> &str {
&self.id
}
}
impl fmt::Display for BlankNode {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "_:{}", self.value())
}
}
/// A RDF [literal](https://www.w3.org/TR/rdf11-concepts/#dfn-literal)
#[derive(Eq, PartialEq, Debug, Clone, Hash)]
pub enum Literal {
SimpleLiteral(String),
LanguageTaggedString { value: String, language: String },
TypedLiteral { value: String, datatype: NamedNode },
}
lazy_static! {
static ref XSD_STRING: NamedNode = NamedNode {
iri: "http://www.w3.org/2001/XMLSchema#string".to_owned()
};
static ref RDF_LANG_STRING: NamedNode = NamedNode {
iri: "http://www.w3.org/1999/02/22-rdf-syntax-ns#langString".to_owned()
};
}
impl Literal {
/// The literal [lexical form](https://www.w3.org/TR/rdf11-concepts/#dfn-lexical-form)
pub fn value(&self) -> &str {
match self {
Literal::SimpleLiteral(value) => value,
Literal::LanguageTaggedString { value, .. } => value,
Literal::TypedLiteral { value, .. } => value,
}
}
/// The literal [language tag](https://www.w3.org/TR/rdf11-concepts/#dfn-language-tag) if it is a [language-tagged string](https://www.w3.org/TR/rdf11-concepts/#dfn-language-tagged-string)
pub fn language(&self) -> Option<&str> {
match self {
Literal::LanguageTaggedString { language, .. } => Some(language),
_ => None,
}
}
/// The literal [datatype](https://www.w3.org/TR/rdf11-concepts/#dfn-datatype-iri)
/// The datatype of [language-tagged string](https://www.w3.org/TR/rdf11-concepts/#dfn-language-tagged-string) is always http://www.w3.org/1999/02/22-rdf-syntax-ns#langString
pub fn datatype(&self) -> &NamedNode {
match self {
Literal::SimpleLiteral(_) => &XSD_STRING,
Literal::LanguageTaggedString { .. } => &RDF_LANG_STRING,
Literal::TypedLiteral { datatype, .. } => datatype,
}
}
pub fn is_plain(&self) -> bool {
match self {
Literal::SimpleLiteral(_) => true,
Literal::LanguageTaggedString { .. } => true,
_ => false,
}
}
}
impl fmt::Display for Literal {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if self.is_plain() {
self.language()
.map(|lang| write!(f, "\"{}\"@{}", self.value(), lang))
.unwrap_or_else(|| write!(f, "\"{}\"", self.value()))
} else {
write!(f, "\"{}\"^^{}", self.value(), self.datatype())
}
}
}
/// The union of [IRIs](https://www.w3.org/TR/rdf11-concepts/#dfn-iri) and [blank nodes](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node).
#[derive(Eq, PartialEq, Debug, Clone, Hash)]
pub enum NamedOrBlankNode {
NamedNode(NamedNode),
BlankNode(BlankNode),
}
impl NamedOrBlankNode {
pub fn value(&self) -> &str {
match self {
NamedOrBlankNode::NamedNode(node) => node.value(),
NamedOrBlankNode::BlankNode(node) => node.value(),
}
}
}
impl fmt::Display for NamedOrBlankNode {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
NamedOrBlankNode::NamedNode(node) => node.fmt(f),
NamedOrBlankNode::BlankNode(node) => node.fmt(f),
}
}
}
impl From<NamedNode> for NamedOrBlankNode {
fn from(node: NamedNode) -> Self {
NamedOrBlankNode::NamedNode(node)
}
}
impl From<BlankNode> for NamedOrBlankNode {
fn from(node: BlankNode) -> Self {
NamedOrBlankNode::BlankNode(node)
}
}
/// A RDF [term](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-term)
/// It is the union of [IRIs](https://www.w3.org/TR/rdf11-concepts/#dfn-iri), [blank nodes](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node) and [literals](https://www.w3.org/TR/rdf11-concepts/#dfn-literal).
#[derive(Eq, PartialEq, Debug, Clone, Hash)]
pub enum Term {
NamedNode(NamedNode),
BlankNode(BlankNode),
Literal(Literal),
}
impl Term {
pub fn value(&self) -> &str {
match self {
Term::NamedNode(node) => node.value(),
Term::BlankNode(node) => node.value(),
Term::Literal(literal) => literal.value(),
}
}
}
impl fmt::Display for Term {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
Term::NamedNode(node) => node.fmt(f),
Term::BlankNode(node) => node.fmt(f),
Term::Literal(literal) => literal.fmt(f),
}
}
}
impl From<NamedNode> for Term {
fn from(node: NamedNode) -> Self {
Term::NamedNode(node)
}
}
impl From<BlankNode> for Term {
fn from(node: BlankNode) -> Self {
Term::BlankNode(node)
}
}
impl From<Literal> for Term {
fn from(literal: Literal) -> Self {
Term::Literal(literal)
}
}
impl From<NamedOrBlankNode> for Term {
fn from(resource: NamedOrBlankNode) -> Self {
match resource {
NamedOrBlankNode::NamedNode(node) => Term::NamedNode(node),
NamedOrBlankNode::BlankNode(node) => Term::BlankNode(node),
}
}
}
/// The interface of containers that looks like [RDF triples](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple)
pub trait TripleLike {
/// The [subject](https://www.w3.org/TR/rdf11-concepts/#dfn-subject) of this triple
fn subject(&self) -> &NamedOrBlankNode;
/// The [subject](https://www.w3.org/TR/rdf11-concepts/#dfn-subject) of this triple
fn subject_owned(self) -> NamedOrBlankNode;
/// The [predicate](https://www.w3.org/TR/rdf11-concepts/#dfn-predicate) of this triple
fn predicate(&self) -> &NamedNode;
/// The [predicate](https://www.w3.org/TR/rdf11-concepts/#dfn-predicate) of this triple
fn predicate_owned(self) -> NamedNode;
/// The [object](https://www.w3.org/TR/rdf11-concepts/#dfn-object) of this triple
fn object(&self) -> &Term;
/// The [object](https://www.w3.org/TR/rdf11-concepts/#dfn-object) of this triple
fn object_owned(self) -> Term;
}
/// A [RDF triple](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple)
#[derive(Eq, PartialEq, Debug, Clone, Hash)]
pub struct Triple {
subject: NamedOrBlankNode,
predicate: NamedNode,
object: Term,
}
impl fmt::Display for Triple {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{} {} {} .", self.subject, self.predicate, self.object)
}
}
impl TripleLike for Triple {
fn subject(&self) -> &NamedOrBlankNode {
return &self.subject;
}
fn subject_owned(self) -> NamedOrBlankNode {
return self.subject;
}
fn predicate(&self) -> &NamedNode {
return &self.predicate;
}
fn predicate_owned(self) -> NamedNode {
return self.predicate;
}
fn object(&self) -> &Term {
return &self.object;
}
fn object_owned(self) -> Term {
return self.object;
}
}
/// The interface of [triples](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple) that are in a [RDF dataset](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-dataset)
pub trait QuadLike: TripleLike {
/// The name of the RDF [graph](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-graph) in which the triple is or None if it is in the [default graph](https://www.w3.org/TR/rdf11-concepts/#dfn-default-graph)
fn graph_name(&self) -> &Option<NamedOrBlankNode>;
/// The name of the RDF [graph](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-graph) in which the triple is or None if it is in the [default graph](https://www.w3.org/TR/rdf11-concepts/#dfn-default-graph)
fn graph_name_owned(self) -> Option<NamedOrBlankNode>;
}
/// A [triple](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple) in a [RDF dataset](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-dataset)
#[derive(Eq, PartialEq, Debug, Clone, Hash)]
pub struct Quad {
subject: NamedOrBlankNode,
predicate: NamedNode,
object: Term,
graph_name: Option<NamedOrBlankNode>,
}
impl fmt::Display for Quad {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self.graph_name {
Some(ref graph_name) => write!(
f,
"{} {} {} {} .",
self.subject, self.predicate, self.object, graph_name
),
None => write!(f, "{} {} {} .", self.subject, self.predicate, self.object),
}
}
}
impl TripleLike for Quad {
fn subject(&self) -> &NamedOrBlankNode {
return &self.subject;
}
fn subject_owned(self) -> NamedOrBlankNode {
return self.subject;
}
fn predicate(&self) -> &NamedNode {
return &self.predicate;
}
fn predicate_owned(self) -> NamedNode {
return self.predicate;
}
fn object(&self) -> &Term {
return &self.object;
}
fn object_owned(self) -> Term {
return self.object;
}
}
impl QuadLike for Quad {
fn graph_name(&self) -> &Option<NamedOrBlankNode> {
return &self.graph_name;
}
fn graph_name_owned(self) -> Option<NamedOrBlankNode> {
return self.graph_name;
}
}
/// An utility structure to generate bank node ids in a thread safe way
#[derive(Debug, Clone)]
struct U64IDProvider {
counter: Arc<Mutex<u64>>,
}
impl U64IDProvider {
pub fn next(&self) -> u64 {
let mut id = self.counter.lock().unwrap();
*id += 1;
*id
}
}
impl Default for U64IDProvider {
fn default() -> Self {
U64IDProvider {
counter: Arc::new(Mutex::new(0)),
}
}
}
/// A structure creating RDF elements
#[derive(Debug, Clone)]
pub struct DataFactory {
blank_node_id_provider: U64IDProvider,
}
impl Default for DataFactory {
fn default() -> Self {
DataFactory {
blank_node_id_provider: U64IDProvider::default(),
}
}
}
impl DataFactory {
/// Builds a RDF [IRI](https://www.w3.org/TR/rdf11-concepts/#dfn-iri)
pub fn named_node(&self, iri: impl Into<String>) -> NamedNode {
NamedNode { iri: iri.into() }
}
/// Builds a RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node) with a known id
pub fn blank_node(&self, id: impl Into<String>) -> BlankNode {
BlankNode { id: id.into() }
}
/// Builds a new RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node) with a unique id
pub fn new_blank_node(&self) -> BlankNode {
self.blank_node(self.blank_node_id_provider.next().to_string())
}
/// Builds a RDF [simple literal](https://www.w3.org/TR/rdf11-concepts/#dfn-simple-literal)
pub fn simple_literal(&self, value: impl Into<String>) -> Literal {
Literal::SimpleLiteral(value.into())
}
/// Builds a RDF [literal](https://www.w3.org/TR/rdf11-concepts/#dfn-literal) with a [datatype](https://www.w3.org/TR/rdf11-concepts/#dfn-datatype-iri)
pub fn typed_literal(
&self,
value: impl Into<String>,
datatype: impl Into<NamedNode>,
) -> Literal {
//TODO: find the best representation
Literal::TypedLiteral {
value: value.into(),
datatype: datatype.into(),
}
}
/// Builds a RDF [language-tagged string](https://www.w3.org/TR/rdf11-concepts/#dfn-language-tagged-string)
pub fn language_tagged_literal(
&self,
value: impl Into<String>,
language: impl Into<String>,
) -> Literal {
Literal::LanguageTaggedString {
value: value.into(),
language: language.into(),
}
}
/// Builds a RDF [triple](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple)
pub fn triple(
&self,
subject: impl Into<NamedOrBlankNode>,
predicate: impl Into<NamedNode>,
object: impl Into<Term>,
) -> Triple {
Triple {
subject: subject.into(),
predicate: predicate.into(),
object: object.into(),
}
}
/// Builds a RDF [triple](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-triple) in a [RDF dataset](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-dataset)
pub fn quad(
&self,
subject: impl Into<NamedOrBlankNode>,
predicate: impl Into<NamedNode>,
object: impl Into<Term>,
graph_name: impl Into<Option<NamedOrBlankNode>>,
) -> Quad {
Quad {
subject: subject.into(),
predicate: predicate.into(),
object: object.into(),
graph_name: graph_name.into(),
}
}
}

1
src/model/mod.rs
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pub mod data;

38
src/rio/mod.rs
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use std::error::Error;
use std::fmt;
pub mod ntriples;
pub type RioResult<T> = Result<T, RioError>;
#[derive(Debug)]
pub struct RioError {
error: Box<Error + Send + Sync>,
}
impl RioError {
pub fn new<E>(error: E) -> RioError
where
E: Into<Box<Error + Send + Sync>>,
{
RioError {
error: error.into(),
}
}
}
impl fmt::Display for RioError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.error.fmt(f)
}
}
impl Error for RioError {
fn description(&self) -> &str {
self.error.description()
}
fn cause(&self) -> Option<&Error> {
Some(&*self.error)
}
}

102
src/rio/ntriples/grammar.rustpeg
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//See https://www.w3.org/TR/2014/REC-n-triples-20140225/#n-triples-grammar
use std::char;
use model::data::*;
#![arguments(data_factory: &DataFactory)]
//[2]
#[pub]
triple -> Option<Triple> =
_ s:subject _ p:predicate _ o:object _ "." _ comment? { Some(data_factory.triple(s, p, o)) } /
_ comment? { None }
//[3]
subject -> NamedOrBlankNode =
i: IRIREF { data_factory.named_node(i).into() } /
b: BLANK_NODE_LABEL { data_factory.blank_node(b).into() }
//[4]
predicate -> NamedNode = i:IRIREF {
data_factory.named_node(i)
}
//[5]
object -> Term =
i: IRIREF { data_factory.named_node(i).into() } /
b: BLANK_NODE_LABEL { data_factory.blank_node(b).into() } /
l: literal { l.into() }
//[6]
literal -> Literal =
v: STRING_LITERAL_QUOTE _ "^^" _ t:IRIREF { data_factory.typed_literal(v, data_factory.named_node(t)) } /
v: STRING_LITERAL_QUOTE _ l:LANGTAG { data_factory.language_tagged_literal(v, l) } /
v: STRING_LITERAL_QUOTE { data_factory.simple_literal(v) }
//[144s]
LANGTAG -> String = "@" l: $([a-zA-Z]+ ("-" [a-zA-Z0-9]+)*) {
l.into()
}
//[7]
EOL = [\r\n]+
//[8]
IRIREF -> String = "<" _ i: $(([^<>{}] / UCHAR)*) _ ">" {
i.into()
}
//[9]
STRING_LITERAL_QUOTE -> String = "\"" l: ((NOT_BAD_LITERAL_VALUE / ECHAR / UCHAR)*) "\"" {
l.into_iter().collect()
}
NOT_BAD_LITERAL_VALUE -> char = c: $([^\u{0022}\u{005c}\u{000a}\u{000d}]) { c.chars().next().unwrap() }
//[141s]
BLANK_NODE_LABEL -> String = "_:" b: $((PN_CHARS_U / [0-9]) ((PN_CHARS / ".")* PN_CHARS)?) {
b.into()
}
//[10]
UCHAR -> char = "\\u" h: $(HEX HEX HEX HEX) {
u32::from_str_radix(h, 16).ok().and_then(char::from_u32).unwrap()
} / "\\U" h: $(HEX HEX HEX HEX HEX HEX HEX HEX) {
u32::from_str_radix(h, 16).ok().and_then(char::from_u32).unwrap()
}
//[153s]
ECHAR -> char = '\\' c: $([tbnrf"'\\]) {
match c {
"t" => '\u{0009}',
"b" => '\u{0008}',
"n" => '\u{000A}',
"r" => '\u{000D}',
"f" => '\u{000C}',
"\"" => '\u{0022}',
"'" => '\u{0027}',
"\\" => '\u{005C}',
_ => panic!("unexpected escaped char") // not possible
}
}
//[157s]
PN_CHARS_BASE -> char = c: $([A-Za-z\u{00C0}-\u{00D6}\u{00D8}-\u{00F6}\u{00F8}-\u{02FF}\u{0370}-\u{037D}\u{037F}-\u{1FFF}\u{200C}-\u{200D}\u{2070}-\u{218F}\u{2C00}-\u{2FEF}\u{3001}-\u{D7FF}\u{F900}-\u{FDCF}\u{FDF0}-\u{FFFD}]) { c.chars().next().unwrap() }
//[158s]
PN_CHARS_U -> char = PN_CHARS_BASE / '_' { '_' } / ':' { ':' }
//[160s]
PN_CHARS -> char = PN_CHARS_U / c: $([\-0-9\u{00B7}\u{0300}-\u{036F}\u{203F}-\u{2040}]) { c.chars().next().unwrap() }
//[162s]
HEX -> char = c: $([0-9A-Fa-f]) { c.chars().next().unwrap() }
//space
_ = #quiet<[ \t]*>
//comment
comment = #quiet<"#" [^\r\n]*>
/*grammar;
pub NTripleLine: Option<Triple> = {
Comment? => None,
<t:NTriple> Comment? => Some(t)
};
pub NQuadLine: Option<Quad> = {
Comment? => None,
<t:NQuad> Comment? => Some(t)
};
NTriple: Triple = <s:Node> <p:IRI> <o:RDFTerm> "." => data_factory.triple(s, p, o);
NQuad: Quad = {
<s:Node> <p:IRI> <o:RDFTerm> <g:Node> "." => data_factory.quad(s, p, o, Some(g)),
<s:Node> <p:IRI> <o:RDFTerm> "." => data_factory.quad(s, p, o, None)
};
*/

30
src/rio/ntriples/mod.rs
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///Implements https://www.w3.org/TR/n-triples/
mod grammar {
include!(concat!(env!("OUT_DIR"), "/grammar.rs"));
}
use model::data::*;
use rio::*;
use std::io::BufRead;
use std::io::BufReader;
use std::io::Read;
use std::sync::Arc;
pub fn read_ntriples<'a, R: Read + 'a>(
source: R,
data_factory: &'a DataFactory,
) -> impl Iterator<Item = RioResult<Triple>> {
let factory = data_factory.clone(); //TODO: try to avoid clone here
let mut input = String::new();
//TODO: use read_lines to avoid allocations
BufReader::new(source)
.lines()
.flat_map(move |line| match line {
Ok(line) => match grammar::triple(line.as_str(), &factory) {
Ok(triple) => Some(Ok(triple?)),
Err(error) => Some(Err(RioError::new(error))),
},
Err(error) => Some(Err(RioError::new(error))),
})
}
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