Adds some constant NamedNodes for basic vocabularies

src/model/mod.rs

@@ -1 +1,2 @@
 pub mod data;
+pub mod vocab;

src/model/vocab.rs

@@ -0,0 +1,86 @@
+///! Provides ready to use NamedNode for basic RDF vocabularies
+
+pub mod rdf {
+    use model::data::NamedNode;
+    use std::str::FromStr;
+
+    lazy_static! {
+        pub static ref FIRST: NamedNode =
+            NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#first").unwrap();
+        pub static ref HTML: NamedNode =
+            NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#HTML").unwrap();
+        pub static ref LANG_STRING: NamedNode =
+            NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#langString").unwrap();
+        pub static ref NIL: NamedNode =
+            NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#nil").unwrap();
+        pub static ref REST: NamedNode =
+            NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#rest").unwrap();
+        pub static ref TYPE: NamedNode =
+            NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#type").unwrap();
+        pub static ref XML_LITERAL: NamedNode =
+            NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral").unwrap();
+    }
+}
+
+pub mod xsd {
+    ///! NamedNodes for [RDF compatible XSD datatypes](https://www.w3.org/TR/rdf11-concepts/#dfn-rdf-compatible-xsd-types)
+    use model::data::NamedNode;
+    use std::str::FromStr;
+
+    lazy_static! {
+        /// true, false
+        pub static ref BOOLEAN: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#boolean").unwrap();
+        /// Dates (yyyy-mm-dd) with or without timezone
+        pub static ref DATE: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#date").unwrap();
+        /// Duration of time (days, hours, minutes, seconds only)
+        pub static ref DAY_TIME_DURATION: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#dayTimeDuration").unwrap();
+        /// Date and time with or without timezone
+        pub static ref DATE_TIME: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#dateTime").unwrap();
+        /// Date and time with required timezone
+        pub static ref DATE_TIME_STAMP: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#dateTimeStamp").unwrap();
+        /// Arbitrary-precision decimal numbers
+        pub static ref DECIMAL: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#decimal").unwrap();
+        /// 64-bit floating point numbers incl. ±Inf, ±0, NaN
+        pub static ref DOUBLE: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#double").unwrap();
+        /// Duration of time
+        pub static ref DURATION: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#duration").unwrap();
+        /// 32-bit floating point numbers incl. ±Inf, ±0, NaN
+        pub static ref FLOAT: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#float").unwrap();
+        /// Gregorian calendar day of the month
+        pub static ref G_DAY: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#gDay").unwrap();
+        /// Gregorian calendar month
+        pub static ref G_MONTH: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#gMonth").unwrap();
+        /// Gregorian calendar month and day
+        pub static ref G_MONTH_DAY: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#gMonthDay").unwrap();
+        /// Gregorian calendar year
+        pub static ref G_YEAR: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#gYear").unwrap();
+        /// Gregorian calendar year and month
+        pub static ref G_YEAR_MONTH: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#gYearMonth").unwrap();
+        /// Arbitrary-size integer numbers
+        pub static ref INTEGER: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#integer").unwrap();
+        /// Times (hh:mm:ss.sss…) with or without timezone
+        pub static ref TIME: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#time").unwrap();
+        /// Character strings (but not all Unicode character strings)
+        pub static ref STRING: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#string").unwrap();
+        /// Duration of time (months and years only)
+        pub static ref YEAR_MONTH_DURATION: NamedNode =
+            NamedNode::from_str("http://www.w3.org/2001/XMLSchema#yearMonthDuration").unwrap();
+    }
+}

src/rio/turtle/turtle_grammar.rustpeg

@@ -3,7 +3,8 @@
 use std::char;
 use url::Url;
 use model::data::*;
-use std::str::FromStr;
+use model::vocab::rdf;
+use model::vocab::xsd;
 use std::iter;
 use rio::turtle::ParserState;
 
@@ -71,7 +72,7 @@ objectList -> () = object _ ("," _ object _)*
 
 //[9]
 verb -> NamedNode = predicate /
-    "a" { NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#type").unwrap() }
+    "a" { rdf::TYPE.clone() }
 
 // [10]
 subject -> NamedOrBlankNode =
@@ -116,13 +117,11 @@ blankNodePropertyList_open -> () = "[" {
 
 //[15]
 collection -> NamedOrBlankNode = '(' _ o:(collection_value*) ')' {
-    let first = NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#first").unwrap();
-    let rest = NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#rest").unwrap();
-    let mut current_list_node = NamedOrBlankNode::from(NamedNode::from_str("http://www.w3.org/1999/02/22-rdf-syntax-ns#nil").unwrap());
+    let mut current_list_node = NamedOrBlankNode::from(rdf::NIL.clone());
     for obj in o.into_iter().rev() {
         let new_blank_node = NamedOrBlankNode::from(data_factory.new_blank_node());
-        buffer.push(Triple::new(new_blank_node.clone(), first.clone(), obj));
-        buffer.push(Triple::new(new_blank_node.clone(), rest.clone(), current_list_node));
+        buffer.push(Triple::new(new_blank_node.clone(), rdf::FIRST.clone(), obj));
+        buffer.push(Triple::new(new_blank_node.clone(), rdf::REST.clone(), current_list_node));
         current_list_node = new_blank_node;
     }
     current_list_node
@@ -131,9 +130,9 @@ collection_value -> Term = o:object_value _ { o }
 
 //[16]
 NumericLiteral -> Literal =
-    d:$(DOUBLE) { data_factory.typed_literal(d, NamedNode::from_str("http://www.w3.org/2001/XMLSchema#double").unwrap()) } /
-    d:$(DECIMAL) { data_factory.typed_literal(d, NamedNode::from_str("http://www.w3.org/2001/XMLSchema#decimal").unwrap()) } /
-    i:$(INTEGER) { data_factory.typed_literal(i, NamedNode::from_str("http://www.w3.org/2001/XMLSchema#integer").unwrap()) }
+    d:$(DOUBLE) { data_factory.typed_literal(d, xsd::DOUBLE.clone()) } /
+    d:$(DECIMAL) { data_factory.typed_literal(d, xsd::DECIMAL.clone()) } /
+    i:$(INTEGER) { data_factory.typed_literal(i, xsd::INTEGER.clone()) }
 
 //[128s]
 RDFLiteral -> Literal =