chore: add data generator file (#442)

* chore: add data generator file

* chore: fix lint errors

* Update .gitignore

.gitignore

@@ -6,3 +6,4 @@ docs
 lib
 node_modules
 coverage
+perf/data/*.trig

perf/data/trigGen.js

@@ -0,0 +1,28 @@
+const fs = require('fs');
+const path = require('path');
+const N3 = require('../../lib');
+
+const { quad, namedNode, literal } = N3.DataFactory;
+const dim = 30;
+
+const writer = new N3.StreamWriter();
+
+// eslint-disable-next-line
+fs.rmSync(path.join(__dirname, 'data.trig'), { force: true });
+const outputStream = fs.createWriteStream(path.join(__dirname, 'data.trig'));
+writer.pipe(outputStream);
+
+const prefix = 'http://example.org/#';
+for (let i = 0; i < dim; i++) {
+  for (let j = 0; j < dim; j++) {
+    for (let k = 0; k < dim; k++) {
+      for (let l = 0; l < dim; l++) {
+        writer.write(quad(
+          namedNode(prefix + i), namedNode(prefix + j), (k % 2 === 0 ? namedNode : literal)(prefix + k), namedNode(prefix + l),
+        ));
+      }
+    }
+  }
+}
+
+writer.end();