feat: add resourceShapeFromQuads to discovery (#201)

* feat: add resourceShapeFromQuads to discovery

* test: remove redundant casts

Signed-off-by: Wouter Termont <[email protected]>

Co-authored-by: Wouter Termont <[email protected]>

packages/semcom-sdk/lib/discovery.spec.ts

@@ -0,0 +1,21 @@
+import { DataFactory } from 'n3';
+import { resourceShapeFromQuads } from './discovery';
+
+describe('resourceShapeFromQuads', () => {
+
+  const quadPredicate = 'http://example.com/predicate';
+
+  const quad = DataFactory.quad(
+    DataFactory.namedNode('test'),
+    DataFactory.namedNode(quadPredicate),
+    DataFactory.namedNode('test')
+  );
+
+  it('should discover shapes from a quad', () => {
+
+    const shapes = resourceShapeFromQuads([ quad ]);
+    expect(shapes).toContainEqual(quadPredicate);
+
+  });
+
+});

packages/semcom-sdk/lib/discovery.ts

@@ -1,4 +1,20 @@
-import { Store, Parser, DataFactory } from 'n3';
+import { Store, Parser, DataFactory, Quad } from 'n3';
+
+/**
+ * Discovers the shape of a resource, given quads.
+ *
+ * @param quads the quads for which to discover shapes.
+ * @returns the uris of the discovered shapes.
+ */
+export const resourceShapeFromQuads = (quads: Quad[]): string[] => {
+
+  const predicates = new Set<string>(quads.map((quad) => quad.predicate.value));
+
+  const classes = new Store(quads).getQuads(null, DataFactory.namedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'), null, null).map((quad) => quad.object.value);
+
+  return Array.from(predicates).concat(classes);
+
+};
 
 /**
  * Discovers the shape of a resource, given its uri and a (custom) fetch function.
@@ -21,13 +37,7 @@ export const resourceShape = (
 
     const parser = new Parser();
 
-    return response.text().then((body) => {
-
-      const classes = new Store(parser.parse(body)).getQuads(null, DataFactory.namedNode('http://www.w3.org/1999/02/22-rdf-syntax-ns#type'), null, null).map((quad) => quad.object.value);
-
-      return classes;
-
-    });
+    return response.text().then((body) => resourceShapeFromQuads(parser.parse(body)));
 
   });
 

packages/semcom-sdk/package.json

@@ -97,10 +97,10 @@
     "coverageThreshold": {
       "global": {
         "branches": 87.5,
-        "functions": 50,
-        "lines": 80.95,
-        "statements": 77.61
+        "functions": 55.56,
+        "lines": 87.69,
+        "statements": 84.72
       }
     }
   }
-}
+}