JS: Overrides the toString method on terms

js/README.md

@@ -57,6 +57,8 @@ const foo = oxigraph.literal("foo");
 const quad = oxigraph.quad(blank, ex, foo);
 ```
 
+All terms overrides the the `toString()` method to return a N-Quads/SPARQL-like representation of the terms.
+
 ### `Store`
 
 Oxigraph API is centered around the `Store` class.

js/src/model.rs

@@ -112,6 +112,11 @@ impl JsNamedNode {
         self.inner.as_str().to_owned()
     }
 
+    #[wasm_bindgen(js_name = toString)]
+    pub fn to_string(&self) -> String {
+        self.inner.to_string()
+    }
+
     pub fn equals(&self, other: &JsValue) -> bool {
         if let Ok(Some(JsTerm::NamedNode(other))) =
             FromJsConverter::default().to_optional_term(other)
@@ -177,6 +182,11 @@ impl JsBlankNode {
         self.inner.as_str().to_owned()
     }
 
+    #[wasm_bindgen(js_name = toString)]
+    pub fn to_string(&self) -> String {
+        self.inner.to_string()
+    }
+
     pub fn equals(&self, other: &JsValue) -> bool {
         if let Ok(Some(JsTerm::BlankNode(other))) =
             FromJsConverter::default().to_optional_term(other)
@@ -252,6 +262,11 @@ impl JsLiteral {
         self.inner.datatype().into_owned().into()
     }
 
+    #[wasm_bindgen(js_name = toString)]
+    pub fn to_string(&self) -> String {
+        self.inner.to_string()
+    }
+
     pub fn equals(&self, other: &JsValue) -> bool {
         if let Ok(Some(JsTerm::Literal(other))) = FromJsConverter::default().to_optional_term(other)
         {
@@ -296,6 +311,11 @@ impl JsDefaultGraph {
         "".to_owned()
     }
 
+    #[wasm_bindgen(js_name = toString)]
+    pub fn to_string(&self) -> String {
+        "DEFAULT".to_string()
+    }
+
     pub fn equals(&self, other: &JsValue) -> bool {
         if let Ok(Some(JsTerm::DefaultGraph(other))) =
             FromJsConverter::default().to_optional_term(other)
@@ -325,6 +345,11 @@ impl JsVariable {
         self.inner.as_str().to_owned()
     }
 
+    #[wasm_bindgen(js_name = toString)]
+    pub fn to_string(&self) -> String {
+        self.inner.to_string()
+    }
+
     pub fn equals(&self, other: &JsValue) -> bool {
         if let Ok(Some(JsTerm::Variable(other))) =
             FromJsConverter::default().to_optional_term(other)
@@ -386,6 +411,11 @@ impl JsQuad {
         JsTerm::from(self.inner.graph_name.clone()).into()
     }
 
+    #[wasm_bindgen(js_name = toString)]
+    pub fn to_string(&self) -> String {
+        self.inner.to_string()
+    }
+
     pub fn equals(&self, other: &JsValue) -> bool {
         if let Ok(Some(JsTerm::Quad(other))) = FromJsConverter::default().to_optional_term(other) {
             self == &other

js/test/model.js

@@ -1,2 +1,36 @@
+/* global describe, it */
+
 const oxigraph = require('../pkg/oxigraph.js')
+const assert = require('assert')
 require('../node_modules/@rdfjs/data-model/test/index.js')(oxigraph)
+
+describe('DataModel', function () {
+  describe('#toString()', function () {
+    it('namedNode().toString() should return SPARQL compatible syntax', function () {
+      assert.strictEqual('<http://example.com>', oxigraph.namedNode('http://example.com').toString())
+    })
+
+    it('blankNode().toString() should return SPARQL compatible syntax', function () {
+      assert.strictEqual('_:a', oxigraph.blankNode('a').toString())
+    })
+
+    it('literal().toString() should return SPARQL compatible syntax', function () {
+      assert.strictEqual('"a\\"b"@en', oxigraph.literal('a"b', 'en').toString())
+    })
+
+    it('defaultGraph().toString() should return SPARQL compatible syntax', function () {
+      assert.strictEqual('DEFAULT', oxigraph.defaultGraph().toString())
+    })
+
+    it('variable().toString() should return SPARQL compatible syntax', function () {
+      assert.strictEqual('?a', oxigraph.variable('a').toString())
+    })
+
+    it('quad().toString() should return SPARQL compatible syntax', function () {
+      assert.strictEqual(
+        '<http://example.com/s> <http://example.com/p> <<<http://example.com/s1> <http://example.com/p1> <http://example.com/o1>>> <http://example.com/g>',
+        oxigraph.quad(oxigraph.namedNode('http://example.com/s'), oxigraph.namedNode('http://example.com/p'), oxigraph.quad(oxigraph.namedNode('http://example.com/s1'), oxigraph.namedNode('http://example.com/p1'), oxigraph.namedNode('http://example.com/o1')), oxigraph.namedNode('http://example.com/g')).toString()
+      )
+    })
+  })
+})