Uses uuid for encoding blank node ids

Cargo.toml

@@ -17,6 +17,7 @@ travis-ci = { repository = "Tpt/rudf" }
 [dependencies]
 lazy_static = "1.0"
 url = "1.7"
+uuid = { version = "0.6", features = ["v4"] }
 
 [build-dependencies]
 peg = "0.5"

src/lib.rs

@@ -1,6 +1,7 @@
 #[macro_use]
 extern crate lazy_static;
 extern crate url;
+extern crate uuid;
 
 pub mod model;
 pub mod rio;

src/model/data.rs

@@ -4,9 +4,10 @@ use std::fmt;
 use std::option::Option;
 use std::str::FromStr;
 use std::sync::Arc;
-use std::sync::Mutex;
 use url::ParseError;
 use url::Url;
+use uuid::Uuid;
+use std::ops::Deref;
 
 /// A RDF [IRI](https://www.w3.org/TR/rdf11-concepts/#dfn-iri)
 #[derive(Eq, PartialEq, Ord, PartialOrd, Debug, Clone, Hash)]
@@ -31,6 +32,14 @@ impl NamedNode {
     }
 }
 
+impl Deref for NamedNode {
+    type Target = Url;
+
+    fn deref(&self) -> &Url {
+        &self.iri
+    }
+}
+
 impl fmt::Display for NamedNode {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f, "<{}>", self.iri)
@@ -48,56 +57,29 @@ impl FromStr for NamedNode {
 /// A RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node)
 #[derive(Eq, PartialEq, Ord, PartialOrd, Debug, Clone, Hash)]
 pub struct BlankNode {
-    id: String,
+    id: Uuid,
 }
 
-impl BlankNode {
-    /// Builds a RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node) with a known id
-    pub fn new(id: impl Into<String>) -> Self {
-        Self { id: id.into() }
-    }
+impl Deref for BlankNode {
+    type Target = Uuid;
 
-    pub fn value(&self) -> &str {
+    fn deref(&self) -> &Uuid {
         &self.id
     }
 }
 
 impl fmt::Display for BlankNode {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "_:{}", self.value())
-    }
-}
-
-/// An utility structure to generate bank node ids in a thread safe way
-#[derive(Debug)]
-struct U64IDProvider {
-    counter: Mutex<u64>,
-}
-
-impl U64IDProvider {
-    pub fn next(&self) -> u64 {
-        let mut id = self.counter.lock().unwrap();
-        *id += 1;
-        *id
+        write!(f, "_:{}", self.id)
     }
 }
 
-impl Default for U64IDProvider {
-    fn default() -> Self {
-        U64IDProvider {
-            counter: Mutex::new(0),
-        }
-    }
-}
-
-lazy_static! {
-    static ref U64_ID_PROVIDER: U64IDProvider = U64IDProvider::default();
-}
-
 impl Default for BlankNode {
     /// Builds a new RDF [blank node](https://www.w3.org/TR/rdf11-concepts/#dfn-blank-node) with a unique id
     fn default() -> Self {
-        BlankNode::new(U64_ID_PROVIDER.next().to_string())
+        BlankNode {
+            id: Uuid::new_v4()
+        }
     }
 }
 
@@ -228,13 +210,6 @@ pub enum NamedOrBlankNode {
 }
 
 impl NamedOrBlankNode {
-    pub fn value(&self) -> &str {
-        match self {
-            NamedOrBlankNode::NamedNode(node) => node.value(),
-            NamedOrBlankNode::BlankNode(node) => node.value(),
-        }
-    }
-
     pub fn is_named_node(&self) -> bool {
         match self {
             NamedOrBlankNode::NamedNode(_) => true,
@@ -281,14 +256,6 @@ pub enum Term {
 }
 
 impl Term {
-    pub fn value(&self) -> &str {
-        match self {
-            Term::NamedNode(node) => node.value(),
-            Term::BlankNode(node) => node.value(),
-            Term::Literal(literal) => literal.value(),
-        }
-    }
-
     pub fn is_named_node(&self) -> bool {
         match self {
             Term::NamedNode(_) => true,

src/rio/ntriples/mod.rs

@@ -9,13 +9,14 @@ use rio::*;
 use std::io::BufRead;
 use std::io::BufReader;
 use std::io::Read;
+use std::collections::BTreeMap;
 
 pub fn read_ntriples<'a, R: Read + 'a>(source: R) -> impl Iterator<Item = RioResult<Triple>> {
     //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()) {
+    let lines = BufReader::new(source).lines();
+    let mut bnodes_map: BTreeMap<String, BlankNode> = BTreeMap::default();
+    lines.flat_map(move |line| match line {
+            Ok(line) => match grammar::triple(line.as_str(), &mut bnodes_map) {
                 Ok(triple) => Some(Ok(triple?)),
                 Err(error) => Some(Err(RioError::new(error))),
             },

src/rio/ntriples/ntriples_grammar.rustpeg

@@ -4,6 +4,9 @@ use std::iter::FromIterator;
 use std::char;
 use std::str::FromStr;
 use model::data::*;
+use std::collections::BTreeMap;
+
+#![arguments(bnodes_map: &mut BTreeMap<String, BlankNode>)]
 
 //[2]
 #[pub]
@@ -60,7 +63,7 @@ STRING_LITERAL_QUOTE_simple_char -> char = c: $([^\u{0022}\u{005c}\u{000a}\u{000
 
 //[141s]
 BLANK_NODE_LABEL -> BlankNode = "_:" b:$(([0-9] / PN_CHARS_U) PN_CHARS* ("."+ PN_CHARS+)*) {
-    BlankNode::new(b)
+    bnodes_map.entry(b.to_string()).or_insert_with(BlankNode::default).clone()
 }
 
 //[10]

src/rio/turtle/mod.rs

@@ -2,47 +2,51 @@
 
 mod grammar {
     include!(concat!(env!("OUT_DIR"), "/turtle_grammar.rs"));
-}
 
-use model::data::*;
-use rio::*;
-use std::collections::HashMap;
-use std::io::BufReader;
-use std::io::Read;
-use url::ParseOptions;
-use url::Url;
-
-//TODO: make private
-pub struct ParserState {
-    pub base_uri: Option<Url>,
-    pub namespaces: HashMap<String, String>,
-    pub cur_subject: Vec<NamedOrBlankNode>,
-    pub cur_predicate: Vec<NamedNode>,
-}
+    use model::data::*;
+    use rio::*;
+    use std::collections::HashMap;
+    use std::io::BufReader;
+    use std::io::Read;
+    use url::ParseOptions;
+    use url::Url;
+    use std::collections::BTreeMap;
+
+    pub struct ParserState {
+        base_uri: Option<Url>,
+        namespaces: HashMap<String, String>,
+        cur_subject: Vec<NamedOrBlankNode>,
+        cur_predicate: Vec<NamedNode>,
+        bnodes_map: BTreeMap<String, BlankNode>
+    }
 
-impl ParserState {
+    impl ParserState {
         fn url_parser<'a>(&'a self) -> ParseOptions<'a> {
             Url::options().base_url(self.base_uri.as_ref())
         }
-}
+    }
 
-pub fn read_turtle<'a, R: Read + 'a>(
+    pub fn read_turtle<'a, R: Read + 'a>(
         source: R,
         base_uri: impl Into<Option<Url>>,
-) -> RioResult<impl Iterator<Item = Triple>> {
+    ) -> RioResult<impl Iterator<Item = Triple>> {
         let mut state = ParserState {
             base_uri: base_uri.into(),
             namespaces: HashMap::default(),
             cur_subject: Vec::default(),
             cur_predicate: Vec::default(),
+            bnodes_map: BTreeMap::default()
         };
         let mut triple_buffer = Vec::default();
 
         let mut string_buffer = String::default();
         BufReader::new(source).read_to_string(&mut string_buffer)?;
 
-    match grammar::turtleDoc(&string_buffer, &mut state, &mut triple_buffer) {
+        match turtleDoc(&string_buffer, &mut state, &mut triple_buffer) {
             Ok(_) => Ok(triple_buffer.into_iter()),
             Err(error) => Err(RioError::new(error)),
         }
+    }
 }
+
+pub use self::grammar::read_turtle;

src/rio/turtle/turtle_grammar.rustpeg

@@ -1,11 +1,9 @@
 //See https://www.w3.org/TR/turtle/#sec-grammar
 
 use std::char;
-use model::data::*;
 use model::vocab::rdf;
 use model::vocab::xsd;
 use std::iter;
-use rio::turtle::ParserState;
 
 #![arguments(state: &mut ParserState, buffer: &mut Vec<Triple>)]
 
@@ -165,7 +163,7 @@ PrefixedName -> String = PNAME_LN /
 
 //[137s]
 BlankNode -> BlankNode =
-    b:BLANK_NODE_LABEL { BlankNode::new(b) } /
+    b:BLANK_NODE_LABEL { state.bnodes_map.entry(b.to_string()).or_insert_with(BlankNode::default).clone() } /
     ANON { BlankNode::default() }
 
 //[18]